// Converter Client 單元測試。
//
// 測試策略：
//   - 用 httptest.Server mock task-scheduler 的 4 個 endpoint
//   - **Phase 0.8b**：直接用 string fake API key（不再注入 stub MCTokenClient）— 與 ADR-015
//     pre-shared key 模式一致；驗 server 端確實收到 `Authorization: Bearer <fakeAPIKey>`
//   - 用 atomic counter 驗 retry 行為（attempts 數對齊 conversion.md §9.1）
//   - 大 body streaming 用 io.LimitReader（不真的寫 100MB 進 RAM）
//
// 對應 task 規範必含 case：
//   - InitJob：Success / StreamingBody / ContentTypeHeader / Conflict409 / Validation400 / 5xx_NoRetry / AuthFailed401 / AuthFailed403
//   - GetJob：Success / NotFound / 5xx_RetryThenSuccess / AuthFailed401_NoRetry
//   - Promote：Success / BadGateway / AuthFailed401_NoRetry
//   - List：Success / Empty / 5xxRetry / AuthFailed401_NoRetry
//   - Constructor：Panics_When_APIKey_Empty
//
// Phase 0.8 conversion (見 .autoflow/04-architecture/conversion.md §2.5 + §9.1)
// Phase 0.8b API key 改造 (見 ADR-015 §3 + §6 + conversion.md §3)
package conversion

import (
	"context"
	"errors"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"sync/atomic"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// ==========================================================================
// Phase 0.8b：fake API key fixtures
// ==========================================================================
//
// 取明顯 fake 字串、含 `do-not-use-in-prod` marker（grepable，避免被誤當真 key）。
// 長度 64 hex chars 對齊 ADR-015 §3.4 production key 規格（`openssl rand -hex 32`）— 即使
// 未來加 length validation 也不會 break 這個 fixture。
const (
	fakeConverterAPIKey = "fake-converter-api-key-do-not-use-in-prod-aaaaaaaaaaaaaaaaaaaaaaaa"
	fakeFAAAPIKey       = "fake-faa-api-key-do-not-use-in-prod-bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
)

// ==========================================================================
// converter mock server helpers
// ==========================================================================

// newConverterClientForTest 建立指向 mock server 的 ConverterClient。
//
// Phase 0.8b：直接傳 fakeConverterAPIKey；不再需要 MCTokenClient 注入。
//
// 使用較短的 init/http timeout 加速 test；retry 退避保持原本（converterRetryBackoff 0.5s 起跳
// 對 retry test 有點久但仍可接受 — 5xx retry test 的 max 2 retries = 0.5s + 1s = 1.5s）。
func newConverterClientForTest(t *testing.T, baseURL string) ConverterClient {
	t.Helper()
	return NewConverterClient(ConverterClientOpts{
		BaseURL:        baseURL,
		APIKey:         fakeConverterAPIKey,
		HTTPClient:     &http.Client{Timeout: 5 * time.Second},
		InitHTTPClient: &http.Client{Timeout: 5 * time.Second},
		Logger:         silentLogger(),
	})
}

// ==========================================================================
// InitJob tests
// ==========================================================================

// TestInitJob_Success：mock 接受 multipart，回 201 + job spec。
//
// Phase 0.8b：驗 server 端確實收到 `Authorization: Bearer <fakeConverterAPIKey>`（pre-shared
// API key 直接 set header；不再透過 MCTokenClient 取 token）。
func TestInitJob_Success(t *testing.T) {
	t.Parallel()

	var serverContentType string
	var serverAuth string
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		require.Equal(t, http.MethodPost, r.Method)
		serverAuth = r.Header.Get("Authorization")
		serverContentType = r.Header.Get("Content-Type")

		// drain body 確認 streaming 完成
		_, _ = io.Copy(io.Discard, r.Body)

		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusCreated)
		_, _ = w.Write([]byte(`{
			"job_id": "550e8400-e29b-41d4-a716-446655440000",
			"status": "created",
			"stage": "onnx",
			"progress": 0,
			"created_at": "2026-04-25T12:00:00Z",
			"updated_at": "2026-04-25T12:00:00Z",
			"expires_at": "2026-05-02T12:00:00Z",
			"user_id": "alice"
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	job, err := cc.InitJob(context.Background(), InitConverterJobReq{
		UserID:          "alice",
		Platform:        "520",
		SourceFilename:  "model.onnx",
		Body:            strings.NewReader("--xyz\r\nContent-Disposition: form-data; name=\"user_id\"\r\n\r\nalice\r\n--xyz--\r\n"),
		BodyContentType: "multipart/form-data; boundary=xyz",
	})

	require.NoError(t, err)
	require.NotNil(t, job)
	assert.Equal(t, "550e8400-e29b-41d4-a716-446655440000", job.JobID)
	assert.Equal(t, "created", job.Status)
	assert.Equal(t, "onnx", job.Stage)
	assert.Equal(t, "multipart/form-data; boundary=xyz", serverContentType,
		"InitJob 必須完整透傳 Content-Type 含 boundary（converter multer 解析依賴此）")
	assert.Equal(t, "Bearer "+fakeConverterAPIKey, serverAuth,
		"Phase 0.8b：必須直接帶 pre-shared API key（不經 MC token cache）")
}

// TestInitJob_StreamingBody：driver 寫 100MB 假資料給 io.Reader，confirm streaming（不全 buffer RAM）。
//
// 用 io.LimitReader 包一個無限 reader，server side 也用 io.Discard 不存。
// 觀察：peakReadBytes 不應接近 100MB（確認 net/http 真的是 streaming）— 但 peak 偵測在 Go 層級不易，
// 改驗：reader 的 ReadCalls 數應遠大於 1（如果 buffer 全進 RAM，net/http 會一次全讀）。
func TestInitJob_StreamingBody(t *testing.T) {
	t.Parallel()

	var serverBytesRead int64
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		// 不一次 ReadAll；用 Copy 到 io.Discard 強制 streaming
		n, _ := io.Copy(io.Discard, r.Body)
		atomic.AddInt64(&serverBytesRead, n)

		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusCreated)
		_, _ = w.Write([]byte(`{
			"job_id": "stream-test", "status": "created", "stage": "onnx", "progress": 0,
			"created_at": "2026-04-25T12:00:00Z",
			"updated_at": "2026-04-25T12:00:00Z",
			"expires_at": "2026-05-02T12:00:00Z"
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	const totalSize = int64(10 * 1024 * 1024) // 10MB（測試成本與 streaming 驗證的平衡）
	reader := &countingReader{
		R: io.LimitReader(zerosReader{}, totalSize),
	}

	// 對 streaming test 加長 timeout
	cc := NewConverterClient(ConverterClientOpts{
		BaseURL:        srv.URL,
		APIKey:         fakeConverterAPIKey,
		HTTPClient:     &http.Client{Timeout: 30 * time.Second},
		InitHTTPClient: &http.Client{Timeout: 30 * time.Second},
		Logger:         silentLogger(),
	})

	job, err := cc.InitJob(context.Background(), InitConverterJobReq{
		UserID:          "alice",
		Body:            reader,
		BodyContentType: "multipart/form-data; boundary=stream",
	})

	require.NoError(t, err)
	require.NotNil(t, job)
	assert.Equal(t, "stream-test", job.JobID)
	assert.Equal(t, totalSize, atomic.LoadInt64(&serverBytesRead),
		"server 應該收到完整 body（streaming proxy 不掉資料）")

	// streaming 證據：reader 應被多次呼叫 Read（如果是 buffer 全 RAM 模式，會一次大讀）
	calls := atomic.LoadInt64(&reader.calls)
	assert.Greater(t, calls, int64(1), "streaming 必須多次 Read（不能一次性 buffer 全 RAM）")
}

// TestInitJob_ContentTypeHeader：multipart boundary 必須完整透傳。
func TestInitJob_ContentTypeHeader(t *testing.T) {
	t.Parallel()

	var receivedCT string
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		receivedCT = r.Header.Get("Content-Type")
		_, _ = io.Copy(io.Discard, r.Body)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusCreated)
		_, _ = w.Write([]byte(`{
			"job_id": "ct-test", "status": "created", "stage": "onnx", "progress": 0,
			"created_at": "2026-04-25T12:00:00Z",
			"updated_at": "2026-04-25T12:00:00Z",
			"expires_at": "2026-05-02T12:00:00Z"
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	const customCT = "multipart/form-data; boundary=---xxx-very-specific-boundary-yyy---"
	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.InitJob(context.Background(), InitConverterJobReq{
		Body:            strings.NewReader("body content"),
		BodyContentType: customCT,
	})
	require.NoError(t, err)
	assert.Equal(t, customCT, receivedCT, "boundary 必須一字不差透傳（含特殊字元）")
}

// TestInitJob_Conflict409_ActiveJobError：mock 回 409 user_has_active_job → return *ActiveJobError。
func TestInitJob_Conflict409_ActiveJobError(t *testing.T) {
	t.Parallel()

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		_, _ = io.Copy(io.Discard, r.Body)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusConflict)
		_, _ = w.Write([]byte(`{
			"error": {
				"code": "user_has_active_job",
				"message": "使用者目前已有進行中的轉檔任務",
				"details": {
					"active_job_id": "550e8400-e29b-41d4-a716-446655440000",
					"active_job_status": "running",
					"active_job_stage": "bie",
					"active_job_progress": 45,
					"active_job_created_at": "2026-04-25T12:00:00Z"
				},
				"request_id": "req-123"
			}
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.InitJob(context.Background(), InitConverterJobReq{
		Body:            strings.NewReader("x"),
		BodyContentType: "multipart/form-data; boundary=xxx",
	})

	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrActiveJobExists), "必須能透過 errors.Is 比對 sentinel")

	var ae *ActiveJobError
	require.True(t, errors.As(err, &ae), "必須能透過 errors.As 取出 ActiveJobError struct")
	require.NotNil(t, ae.Job)
	assert.Equal(t, "550e8400-e29b-41d4-a716-446655440000", ae.Job.JobID)
	assert.Equal(t, "running", ae.Job.Status)
	assert.Equal(t, "bie", ae.Job.Stage)
	assert.Equal(t, 45, ae.Job.Progress)
}

// TestInitJob_Validation400：mock 回 400 + fields → return *ConverterValidationError，
// fields 對齊 openapi.yaml shape（[]ValidationFieldError）。
func TestInitJob_Validation400(t *testing.T) {
	t.Parallel()

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		_, _ = io.Copy(io.Discard, r.Body)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusBadRequest)
		_, _ = w.Write([]byte(`{
			"error": {
				"code": "validation_error",
				"message": "欄位驗證失敗",
				"details": {
					"fields": [
						{"field": "model_id", "message": "model_id 範圍必須在 1 ~ 65535"},
						{"field": "platform", "message": "platform 必須是 520 / 720 / 530 / 630 / 730"}
					]
				},
				"request_id": "req-validation"
			}
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.InitJob(context.Background(), InitConverterJobReq{
		Body:            strings.NewReader("x"),
		BodyContentType: "multipart/form-data; boundary=xxx",
	})

	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrValidationFailed))

	var ve *ConverterValidationError
	require.True(t, errors.As(err, &ve))
	require.Len(t, ve.Fields, 2, "fields 必須對齊 converter openapi.yaml 的 array shape")
	assert.Equal(t, "model_id", ve.Fields[0].Field)
	assert.Equal(t, "model_id 範圍必須在 1 ~ 65535", ve.Fields[0].Message)
	assert.Equal(t, "platform", ve.Fields[1].Field)
	assert.Contains(t, ve.Message, "驗證失敗", "Message 應透傳 converter 原文供 log 用")
}

// TestInitJob_5xx_NoRetry：mock 連續 500 → InitJob 不 retry，立即 return。
//
// 設計理由：multipart body 是 streaming（io.Reader 一次性），retry 會傳到一半的爛資料。
func TestInitJob_5xx_NoRetry(t *testing.T) {
	t.Parallel()

	var counter atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		counter.Add(1)
		_, _ = io.Copy(io.Discard, r.Body)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusInternalServerError)
		_, _ = w.Write([]byte(`{"error":{"code":"misconfiguration","message":"...","request_id":"r"}}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.InitJob(context.Background(), InitConverterJobReq{
		Body:            strings.NewReader("x"),
		BodyContentType: "multipart/form-data; boundary=xxx",
	})

	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrConverterUnavailable))
	assert.Equal(t, int32(1), counter.Load(),
		"InitJob 不可 retry 5xx（streaming body 不可 replay）")
}

// TestInitJob_AuthFailed401：mock 回 401 → ErrConverterAuthFailed（Phase 0.8b 新 sentinel；
// 對外 mask 成 converter_unavailable / 502，避免洩漏「API key 不對齊」內部運維狀態）。
func TestInitJob_AuthFailed401(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		_, _ = io.Copy(io.Discard, r.Body)
		w.WriteHeader(http.StatusUnauthorized)
		_, _ = w.Write([]byte(`{"error":"unauthorized"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.InitJob(context.Background(), InitConverterJobReq{
		Body:            strings.NewReader("x"),
		BodyContentType: "multipart/form-data; boundary=xxx",
	})

	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrConverterAuthFailed),
		"Phase 0.8b：401 必須 mapping 到新 sentinel ErrConverterAuthFailed")
	// Phase 0.8b T3：舊 sentinel ErrServiceClientUnauthorized 已移除，
	// 改由 ErrConverterAuthFailed 接管 401/403 mapping。
	assert.Equal(t, int32(1), attempts.Load(),
		"401 不應 retry（API key 不對 retry 也是 401）")
	// 對外 ErrorCode mask 成 converter_unavailable（不洩漏「API key 不對」）
	assert.Equal(t, "converter_unavailable", ErrorCode(err))
	assert.Equal(t, 502, HTTPStatus(err))
}

// TestInitJob_AuthFailed403：對稱 — mock 回 403 → 同樣 ErrConverterAuthFailed、不 retry。
func TestInitJob_AuthFailed403(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		_, _ = io.Copy(io.Discard, r.Body)
		w.WriteHeader(http.StatusForbidden)
		_, _ = w.Write([]byte(`{"error":"unauthorized"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.InitJob(context.Background(), InitConverterJobReq{
		Body:            strings.NewReader("x"),
		BodyContentType: "multipart/form-data; boundary=xxx",
	})

	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrConverterAuthFailed))
	assert.Equal(t, int32(1), attempts.Load())
}

// TestInitJob_RequiredFieldsValidation：本地參數驗證（不打網路）。
func TestInitJob_RequiredFieldsValidation(t *testing.T) {
	t.Parallel()

	cc := newConverterClientForTest(t, "http://unused")

	// 缺 body
	_, err := cc.InitJob(context.Background(), InitConverterJobReq{
		BodyContentType: "multipart/form-data; boundary=x",
	})
	require.Error(t, err)
	assert.Contains(t, err.Error(), "body is required")

	// 缺 content type
	_, err = cc.InitJob(context.Background(), InitConverterJobReq{
		Body: strings.NewReader("x"),
	})
	require.Error(t, err)
	assert.Contains(t, err.Error(), "content type is required")
}

// TestNewConverterClient_Panics_When_APIKey_Empty：fail-fast 驗證 — Phase 0.8b
// 不允許 server 在「未認證」狀態下啟動，建構式必須立即 panic。
//
// 對齊 ADR-015 §3.5.3 部署檢查清單 #1。
func TestNewConverterClient_Panics_When_APIKey_Empty(t *testing.T) {
	t.Parallel()

	defer func() {
		r := recover()
		require.NotNil(t, r, "APIKey 為空時必須 panic（fail-fast）")
		err, ok := r.(error)
		require.True(t, ok, "panic value 應為 error 型別")
		assert.True(t, errors.Is(err, ErrConverterAPIKeyNotConfigured),
			"panic 應為 ErrConverterAPIKeyNotConfigured sentinel")
	}()

	_ = NewConverterClient(ConverterClientOpts{
		BaseURL: "http://example.com",
		APIKey:  "", // empty — 必須觸發 panic
		Logger:  silentLogger(),
	})
}

// ==========================================================================
// GetJob tests
// ==========================================================================

// TestGetJob_Success：標準 happy path（含完整 Job shape 解析）。
func TestGetJob_Success(t *testing.T) {
	t.Parallel()

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		require.Equal(t, http.MethodGet, r.Method)
		require.Equal(t, "Bearer "+fakeConverterAPIKey, r.Header.Get("Authorization"),
			"Phase 0.8b：每個 GET 也要直接帶 pre-shared API key")
		// path: /api/v1/jobs/{id}
		assert.Contains(t, r.URL.Path, "550e8400")
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{
			"job_id": "550e8400-e29b-41d4-a716-446655440000",
			"user_id": "alice",
			"status": "running",
			"stage": "bie",
			"progress": 45,
			"stage_progress": 60,
			"created_at": "2026-04-25T12:00:00Z",
			"updated_at": "2026-04-25T12:05:30Z",
			"expires_at": "2026-05-02T12:00:00Z",
			"input": {"filename": "model.onnx", "size_bytes": 100, "ref_images_count": 0},
			"parameters": {"model_id": 1001, "version": "v1.0.0", "platform": "520"},
			"error": null
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	job, err := cc.GetJob(context.Background(), "550e8400-e29b-41d4-a716-446655440000")
	require.NoError(t, err)
	require.NotNil(t, job)
	assert.Equal(t, "running", job.Status)
	assert.Equal(t, "bie", job.Stage)
	require.NotNil(t, job.Progress)
	assert.Equal(t, 45, *job.Progress)
	require.NotNil(t, job.StageProgress)
	assert.Equal(t, 60, *job.StageProgress)
	assert.Equal(t, "model.onnx", job.SourceFilename)
	assert.Equal(t, "520", job.Platform)
	assert.False(t, job.ExpiresAt.IsZero())
}

// TestGetJob_NotFound：404 → ErrJobNotFound。
func TestGetJob_NotFound(t *testing.T) {
	t.Parallel()

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNotFound)
		_, _ = w.Write([]byte(`{"error":{"code":"job_not_found","message":"...","request_id":"r"}}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.GetJob(context.Background(), "missing-job")
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrJobNotFound))
}

// TestGetJob_5xx_RetryThenSuccess：500/500/200 → atomic counter 驗 retry 3 次。
func TestGetJob_5xx_RetryThenSuccess(t *testing.T) {
	t.Parallel()

	var counter atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		idx := counter.Add(1)
		if idx <= 2 {
			w.WriteHeader(http.StatusInternalServerError)
			_, _ = w.Write([]byte(`{"error":{"code":"internal_error","message":"...","request_id":"r"}}`))
			return
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{
			"job_id": "j1", "status": "completed", "stage": null, "progress": 100,
			"created_at": "2026-04-25T12:00:00Z",
			"updated_at": "2026-04-25T12:08:30Z",
			"expires_at": "2026-05-02T12:00:00Z"
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	job, err := cc.GetJob(context.Background(), "j1")
	require.NoError(t, err)
	require.NotNil(t, job)
	assert.Equal(t, "completed", job.Status)
	assert.Equal(t, int32(3), counter.Load(), "GetJob 應 retry max 2 次（共 3 attempts）")
}

// TestGetJob_5xx_Exhausted：連續 5xx 用完 retry 仍失敗 → ErrConverterUnavailable。
func TestGetJob_5xx_Exhausted(t *testing.T) {
	t.Parallel()

	var counter atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		counter.Add(1)
		w.WriteHeader(http.StatusBadGateway)
		_, _ = w.Write([]byte(`{"error":{"code":"x","message":"x","request_id":"r"}}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.GetJob(context.Background(), "j1")
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrConverterUnavailable))
	assert.Equal(t, int32(3), counter.Load(), "用完 retry 仍 5xx 應該打 3 次")
}

// TestGetJob_ContextCancel_NoRetry：ctx 在 retry 等待中被 cancel → 立即 return。
func TestGetJob_ContextCancel_NoRetry(t *testing.T) {
	t.Parallel()

	var counter atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		counter.Add(1)
		w.WriteHeader(http.StatusInternalServerError)
		_, _ = w.Write([]byte(`{"error":{"code":"x","message":"x","request_id":"r"}}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)

	ctx, cancel := context.WithCancel(context.Background())
	// 第一次 attempt 完後 cancel；第二次 retry 等待時應立即 return
	go func() {
		time.Sleep(50 * time.Millisecond)
		cancel()
	}()

	_, err := cc.GetJob(ctx, "j1")
	require.Error(t, err)
	assert.True(t, errors.Is(err, context.Canceled))
	// 至多 1 次（cancel 在退避時觸發）
	assert.LessOrEqual(t, counter.Load(), int32(1),
		"ctx cancel 應在第 1 次 attempt 後立即 return，不再打 server")
}

// TestGetJob_AuthFailed401_NoRetry：401 → ErrConverterAuthFailed、不 retry（API key 不對齊）。
func TestGetJob_AuthFailed401_NoRetry(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusUnauthorized)
		_, _ = w.Write([]byte(`{"error":"unauthorized"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.GetJob(context.Background(), "j1")
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrConverterAuthFailed),
		"Phase 0.8b：GetJob 401 必須 mapping 到 ErrConverterAuthFailed")
	assert.Equal(t, int32(1), attempts.Load(),
		"401 不應 retry — API key 不對 retry 100 次也不會自己變對")
}

// ==========================================================================
// Promote tests
// ==========================================================================

// TestPromote_Success：promote response 含 target_object_key。
func TestPromote_Success(t *testing.T) {
	t.Parallel()

	var receivedBody string
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		require.Equal(t, http.MethodPost, r.Method)
		assert.Contains(t, r.URL.Path, "/promote")
		body, _ := io.ReadAll(r.Body)
		receivedBody = string(body)

		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{
			"job_id": "j1",
			"promoted": [
				{
					"source": "nef",
					"target_object_key": "visionA/models/alice/m-1001/v1.0.0/out.nef",
					"size_bytes": 10485760,
					"file_access_agent_etag": "abc123",
					"promoted_at": "2026-04-25T12:30:00Z"
				}
			]
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	result, err := cc.Promote(context.Background(), "j1", PromoteReq{
		UserID:          "alice",
		Source:          "nef",
		TargetObjectKey: "visionA/models/alice/m-1001/v1.0.0/out.nef",
	})
	require.NoError(t, err)
	require.NotNil(t, result)
	assert.Equal(t, "visionA/models/alice/m-1001/v1.0.0/out.nef", result.TargetObjectKey)
	assert.Equal(t, int64(10485760), result.Size)
	assert.Equal(t, "abc123", result.Checksum)
	assert.Contains(t, receivedBody, `"user_id":"alice"`,
		"promote body 應含 user_id metadata（trust boundary 重申）")
	assert.Contains(t, receivedBody, `"target_object_key":"visionA/models/alice/m-1001/v1.0.0/out.nef"`)
}

// TestPromote_DefaultSource：未傳 Source 時預設 nef。
func TestPromote_DefaultSource(t *testing.T) {
	t.Parallel()

	var receivedBody string
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		body, _ := io.ReadAll(r.Body)
		receivedBody = string(body)
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{
			"job_id": "j1",
			"promoted": [{"source":"nef","target_object_key":"x","size_bytes":1,"file_access_agent_etag":"","promoted_at":"2026-04-25T00:00:00Z"}]
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.Promote(context.Background(), "j1", PromoteReq{
		UserID:          "alice",
		TargetObjectKey: "x",
	})
	require.NoError(t, err)
	assert.Contains(t, receivedBody, `"source":"nef"`, "未傳 Source 時應預設 nef")
}

// TestPromote_BadGateway：FAA 不可達 → 502 → ErrFAAUnavailable。
func TestPromote_BadGateway(t *testing.T) {
	t.Parallel()

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusBadGateway)
		_, _ = w.Write([]byte(`{"error":{"code":"file_gateway_unavailable","message":"FAA 不可達","request_id":"r"}}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.Promote(context.Background(), "j1", PromoteReq{
		UserID:          "alice",
		TargetObjectKey: "x",
	})
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrFAAUnavailable),
		"converter 502 file_gateway_unavailable 必須對應到 ErrFAAUnavailable")
}

// TestPromote_NotCompleted409：job_not_ready_for_promote → ErrJobNotCompleted。
func TestPromote_NotCompleted409(t *testing.T) {
	t.Parallel()

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusConflict)
		_, _ = w.Write([]byte(`{"error":{"code":"job_not_ready_for_promote","message":"...","request_id":"r"}}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.Promote(context.Background(), "j1", PromoteReq{
		UserID:          "alice",
		TargetObjectKey: "x",
	})
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrJobNotCompleted))
}

// TestPromote_NotFound404：404 → ErrJobNotFound。
func TestPromote_NotFound404(t *testing.T) {
	t.Parallel()

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNotFound)
		_, _ = w.Write([]byte(`{"error":{"code":"job_not_found","message":"...","request_id":"r"}}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.Promote(context.Background(), "j1", PromoteReq{
		UserID:          "alice",
		TargetObjectKey: "x",
	})
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrJobNotFound))
}

// TestPromote_RequiredFieldsValidation：本地參數驗證。
func TestPromote_RequiredFieldsValidation(t *testing.T) {
	t.Parallel()

	cc := newConverterClientForTest(t, "http://unused")

	_, err := cc.Promote(context.Background(), "", PromoteReq{TargetObjectKey: "x"})
	require.Error(t, err)
	assert.Contains(t, err.Error(), "jobID is required")

	_, err = cc.Promote(context.Background(), "j1", PromoteReq{})
	require.Error(t, err)
	assert.Contains(t, err.Error(), "target_object_key is required")
}

// TestPromote_AuthFailed401_NoRetry：401 → ErrConverterAuthFailed、不 retry。
func TestPromote_AuthFailed401_NoRetry(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusUnauthorized)
		_, _ = w.Write([]byte(`{"error":"unauthorized"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.Promote(context.Background(), "j1", PromoteReq{
		UserID:          "alice",
		TargetObjectKey: "x",
	})
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrConverterAuthFailed),
		"Phase 0.8b：Promote 401 必須 mapping 到 ErrConverterAuthFailed")
	assert.Equal(t, int32(1), attempts.Load(), "401 不應 retry")
}

// ==========================================================================
// ListInProgressJobs tests
// ==========================================================================

// TestListInProgressJobs_Success：query string 含 user_id + status=in_progress。
func TestListInProgressJobs_Success(t *testing.T) {
	t.Parallel()

	var receivedQuery string
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		// path 在 mux pattern 沒結尾 / 時 ServeMux 會匹配精確路徑（list 端點）
		require.Equal(t, http.MethodGet, r.Method)
		receivedQuery = r.URL.RawQuery
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{
			"jobs": [
				{
					"job_id": "j-active",
					"user_id": "alice",
					"status": "running",
					"stage": "bie",
					"progress": 45,
					"created_at": "2026-04-25T12:00:00Z",
					"updated_at": "2026-04-25T12:05:30Z",
					"expires_at": "2026-05-02T12:00:00Z",
					"input": {"filename": "model.onnx", "size_bytes": 1, "ref_images_count": 0},
					"parameters": {"model_id": 1, "version": "v1.0.0", "platform": "720"},
					"error": null
				}
			],
			"total": 1,
			"next_cursor": null
		}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	jobs, err := cc.ListInProgressJobs(context.Background(), "alice")
	require.NoError(t, err)
	require.Len(t, jobs, 1)
	assert.Equal(t, "j-active", jobs[0].JobID)
	assert.Equal(t, "running", jobs[0].Status)
	assert.Equal(t, "bie", jobs[0].Stage)
	assert.Equal(t, "720", jobs[0].Platform)
	assert.Contains(t, receivedQuery, "user_id=alice")
	assert.Contains(t, receivedQuery, "status=in_progress",
		"必須帶 status=in_progress 給 lazy rebuild ownership 用")
}

// TestListInProgressJobs_Empty：[] response → 空 slice。
func TestListInProgressJobs_Empty(t *testing.T) {
	t.Parallel()

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{"jobs":[],"total":0,"next_cursor":null}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	jobs, err := cc.ListInProgressJobs(context.Background(), "alice")
	require.NoError(t, err)
	assert.Len(t, jobs, 0, "empty result 應回空 slice，不是 nil 也不是 error")
	assert.NotNil(t, jobs, "應回非 nil 空 slice 給 caller 安全 range")
}

// TestListInProgressJobs_5xxRetry：5xx 後成功；驗 retry 1 次（共 2 attempts）。
func TestListInProgressJobs_5xxRetry(t *testing.T) {
	t.Parallel()

	var counter atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		idx := counter.Add(1)
		if idx == 1 {
			w.WriteHeader(http.StatusInternalServerError)
			_, _ = w.Write([]byte(`{"error":{"code":"x","message":"x","request_id":"r"}}`))
			return
		}
		w.Header().Set("Content-Type", "application/json")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(`{"jobs":[],"total":0,"next_cursor":null}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	jobs, err := cc.ListInProgressJobs(context.Background(), "alice")
	require.NoError(t, err)
	assert.Len(t, jobs, 0)
	assert.Equal(t, int32(2), counter.Load(), "List 應 retry 1 次（共 2 attempts）")
}

// TestListInProgressJobs_RequiredUserID：本地參數驗證。
func TestListInProgressJobs_RequiredUserID(t *testing.T) {
	t.Parallel()

	cc := newConverterClientForTest(t, "http://unused")

	_, err := cc.ListInProgressJobs(context.Background(), "")
	require.Error(t, err)
	assert.Contains(t, err.Error(), "userID is required")
}

// TestListInProgressJobs_AuthFailed401_NoRetry：401 → ErrConverterAuthFailed、不 retry。
func TestListInProgressJobs_AuthFailed401_NoRetry(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusUnauthorized)
		_, _ = w.Write([]byte(`{"error":"unauthorized"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, err := cc.ListInProgressJobs(context.Background(), "alice")
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrConverterAuthFailed),
		"Phase 0.8b：List 401 必須 mapping 到 ErrConverterAuthFailed")
	assert.Equal(t, int32(1), attempts.Load(), "401 不應 retry")
}

// ==========================================================================
// GetResult tests（Phase 0.8b v0.6，ADR-016 §1）
// ==========================================================================

// TestGetResult_Success：mock 接受 GET /api/v1/jobs/{id}/result，回 200 + binary body
// + Content-Length / Content-Type / Content-Disposition。
//
// Phase 0.8b v0.6：驗 visionA → converter 端送 `Authorization: Bearer <fakeKey>` +
// metadata 正確解出 + body 透傳成功（不被 ReadAll 進 RAM）。
func TestGetResult_Success(t *testing.T) {
	t.Parallel()

	const wantBody = "FAKE_NEF_BINARY_CONTENT_FOR_TEST"
	var serverAuth string
	var serverPath string

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-xyz/result", func(w http.ResponseWriter, r *http.Request) {
		require.Equal(t, http.MethodGet, r.Method)
		serverAuth = r.Header.Get("Authorization")
		serverPath = r.URL.Path

		w.Header().Set("Content-Type", "application/octet-stream")
		w.Header().Set("Content-Length", "32")
		w.Header().Set("Content-Disposition", `attachment; filename="yolov5s_kl720.nef"`)
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(wantBody))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	stream, meta, err := cc.GetResult(context.Background(), "job-xyz")
	require.NoError(t, err)
	require.NotNil(t, stream)
	require.NotNil(t, meta)
	defer stream.Close()

	assert.Equal(t, "Bearer "+fakeConverterAPIKey, serverAuth,
		"Phase 0.8b：server 端應收到 pre-shared API key（visionA → converter API key 路徑）")
	assert.Equal(t, "/api/v1/jobs/job-xyz/result", serverPath)
	assert.Equal(t, int64(32), meta.ContentLength)
	assert.Equal(t, "application/octet-stream", meta.ContentType)
	assert.Equal(t, "yolov5s_kl720.nef", meta.Filename)

	body, err := io.ReadAll(stream)
	require.NoError(t, err)
	assert.Equal(t, wantBody, string(body))
}

// TestGetResult_StreamingBody_NotBuffered：用 8MB body，驗 client 拿到 stream
// 而不是 ReadAll 進 RAM。
//
// 策略：用 countingReader 包 8MB 假 body，count 一次回應裡 reader 被 Read 的次數；
// 然後在 caller 端只讀前 1KB 就 close，驗 client 端對 body 是 lazy read（剩下的不會被讀完）。
func TestGetResult_StreamingBody_NotBuffered(t *testing.T) {
	t.Parallel()

	const totalBytes = 8 * 1024 * 1024 // 8MB
	var serverReadCalls int64

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-big/result", func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Content-Type", "application/octet-stream")
		w.Header().Set("Content-Length", "8388608")
		w.WriteHeader(http.StatusOK)

		// 用 countingReader 包來源（驗 server 端 io.Copy 是 streaming）
		src := &countingReader{R: io.LimitReader(zerosReader{}, totalBytes)}
		_, _ = io.Copy(w, src)
		atomic.AddInt64(&serverReadCalls, src.calls)
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	stream, meta, err := cc.GetResult(context.Background(), "job-big")
	require.NoError(t, err)
	require.NotNil(t, stream)
	require.NotNil(t, meta)

	// caller 只讀前 1KB 就 close — 驗 client 確實是 streaming
	// （非 ReadAll，否則 client 收到 8MB 完整 body 後才回給 caller）
	buf := make([]byte, 1024)
	n, _ := io.ReadFull(stream, buf)
	assert.Equal(t, 1024, n, "caller 應能在 client 還在 streaming 時就拿到部分 byte")
	require.NoError(t, stream.Close())

	assert.Equal(t, int64(8*1024*1024), meta.ContentLength,
		"meta.ContentLength 應正確反映 server 端 Content-Length（不是 -1）")
}

// TestGetResult_AuthFailed401：mock 回 401 → ErrConverterAuthFailed，不 retry，
// 且對外 mask 為 converter_unavailable / 502。
//
// 對齊 T1 Reviewer Minor #M-3：補 mask 行為驗證（ErrorCode / HTTPStatus）；
// 結構與 TestInitJob_AuthFailed401 對稱。
func TestGetResult_AuthFailed401(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-401/result", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusUnauthorized)
		_, _ = w.Write([]byte(`{"error":"unauthorized"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	stream, meta, err := cc.GetResult(context.Background(), "job-401")

	require.Error(t, err)
	assert.Nil(t, stream)
	assert.Nil(t, meta)
	assert.True(t, errors.Is(err, ErrConverterAuthFailed),
		"401 必須 mapping 到 ErrConverterAuthFailed（API key 不對齊運維事件；對外 mask 成 converter_unavailable）")
	assert.Equal(t, int32(1), attempts.Load(), "401 不應 retry")
	// 對外 ErrorCode mask 成 converter_unavailable（不洩漏「API key 不對」內部運維狀態）
	assert.Equal(t, "converter_unavailable", ErrorCode(err),
		"ErrorCode 應 mask 成 converter_unavailable（與 TestInitJob_AuthFailed401 對稱）")
	assert.Equal(t, 502, HTTPStatus(err),
		"HTTPStatus 應為 502 — auth_failed 與『服務不可達』對外同層")
}

// TestGetResult_AuthFailed403：對稱 — mock 回 403 → 同樣 ErrConverterAuthFailed、不 retry，
// 對外仍 mask 為 converter_unavailable / 502。
//
// mapGetResultError 將 401 / 403 mapping 到同一個 sentinel（API key 不對齊運維事件），
// 此 test 對稱補上 403 case，比照 TestInitJob_AuthFailed403 結構。
func TestGetResult_AuthFailed403(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-403/result", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusForbidden)
		_, _ = w.Write([]byte(`{"error":"unauthorized"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	stream, meta, err := cc.GetResult(context.Background(), "job-403")

	require.Error(t, err)
	assert.Nil(t, stream)
	assert.Nil(t, meta)
	assert.True(t, errors.Is(err, ErrConverterAuthFailed),
		"403 必須與 401 共用 ErrConverterAuthFailed sentinel")
	assert.Equal(t, int32(1), attempts.Load(), "403 不應 retry")
	assert.Equal(t, "converter_unavailable", ErrorCode(err),
		"ErrorCode 對 403 也 mask 成 converter_unavailable")
	assert.Equal(t, 502, HTTPStatus(err))
}

// TestGetResult_NotFound404：mock 回 404 → ErrJobNotFound，不 retry。
//
// 對應 ADR-016 §1.3：job_id 不存在 / 已被 GC（converter 端 7d expires_at）。
// 對外 visionA 端用既有 ErrJobNotFound（i18n key `conversion.error.not_found`，
// 與 ownership 找不到共用文字「任務不存在」）。
func TestGetResult_NotFound404(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-404/result", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusNotFound)
		_, _ = w.Write([]byte(`{"error":"job_not_found"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, _, err := cc.GetResult(context.Background(), "job-404")

	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrJobNotFound),
		"404 必須 mapping 到 ErrJobNotFound（job_id 不存在 / 已被 GC）")
	assert.Equal(t, int32(1), attempts.Load(), "404 不應 retry")
}

// TestGetResult_NotCompleted409：mock 回 409 → ErrJobNotCompleted，不 retry。
//
// 對應 ADR-016 §1.3：job 尚未 completed（理論上 visionA flow.go ensurePromoted 已先
// 確認 completed 才打 GetResult，不應發生；保留 mapping 防 converter 端 race）。
func TestGetResult_NotCompleted409(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-409/result", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusConflict)
		_, _ = w.Write([]byte(`{"error":"job_not_completed","status":"running"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, _, err := cc.GetResult(context.Background(), "job-409")

	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrJobNotCompleted),
		"409 必須 mapping 到 ErrJobNotCompleted（job 尚未 completed）")
	assert.Equal(t, int32(1), attempts.Load(), "409 不應 retry")
}

// TestGetResult_ResultExpired410：mock 回 410 → ErrResultExpired（v0.6 新增 sentinel），不 retry。
//
// 對應 ADR-016 §1.3：job completed 但 converter MinIO 內 NEF 已過 7d expires_at 被 GC。
// 對外 HTTP 410 / code `result_expired`，frontend 顯示「轉檔結果已過期，請重新轉檔」CTA。
func TestGetResult_ResultExpired410(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-410/result", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusGone)
		_, _ = w.Write([]byte(`{"error":"result_expired"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, _, err := cc.GetResult(context.Background(), "job-410")

	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrResultExpired),
		"410 必須 mapping 到 ErrResultExpired（NEF 已被 converter MinIO GC）")
	assert.Equal(t, "result_expired", ErrorCode(err),
		"ErrorCode 應回 result_expired（與 converter_unavailable 區分，給 frontend 顯示精確過期訊息）")
	assert.Equal(t, 410, HTTPStatus(err),
		"HTTPStatus 應回 410 Gone（語意：曾經有、現在永遠沒了）")
	assert.Equal(t, int32(1), attempts.Load(), "410 不應 retry（過期不會自己變回來）")
}

// TestGetResult_5xx_RetryThenSuccess：mock 前 1 次回 503、第 2 次 200。
// 驗 Phase A retry 機制：5xx 可 retry。
func TestGetResult_5xx_RetryThenSuccess(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	const wantBody = "RECOVERED_NEF"

	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-503-then-200/result", func(w http.ResponseWriter, r *http.Request) {
		n := attempts.Add(1)
		if n == 1 {
			w.WriteHeader(http.StatusServiceUnavailable)
			_, _ = w.Write([]byte(`{"error":"storage_unavailable"}`))
			return
		}
		w.Header().Set("Content-Type", "application/octet-stream")
		w.Header().Set("Content-Length", "13")
		w.WriteHeader(http.StatusOK)
		_, _ = w.Write([]byte(wantBody))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	// 用較短 retry base 加速 test（注入 fake stream client 不適用，因為 transport
	// 行為與 retry base 不同 — 改用 short-circuit ctx 或直接接受 1s 等候）。
	// resultRetryBackoff(1) = 1s；test 接受。
	cc := newConverterClientForTest(t, srv.URL)
	stream, meta, err := cc.GetResult(context.Background(), "job-503-then-200")
	require.NoError(t, err)
	require.NotNil(t, stream)
	defer stream.Close()

	body, err := io.ReadAll(stream)
	require.NoError(t, err)
	assert.Equal(t, wantBody, string(body))
	assert.Equal(t, int64(13), meta.ContentLength)
	assert.Equal(t, int32(2), attempts.Load(), "5xx 應 retry 1 次後成功（共 2 attempts）")
}

// TestGetResult_5xx_Exhausted：mock 一直 503 → 用完 retry 額度後回 ErrConverterUnavailable。
func TestGetResult_5xx_Exhausted(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-always-503/result", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusServiceUnavailable)
		_, _ = w.Write([]byte(`{"error":"storage_unavailable"}`))
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	_, _, err := cc.GetResult(context.Background(), "job-always-503")
	require.Error(t, err)
	assert.True(t, errors.Is(err, ErrConverterUnavailable),
		"5xx exhausted 必須 mapping 到 ErrConverterUnavailable")
	assert.Equal(t, int32(converterMaxRetriesResult+1), attempts.Load(),
		"應該打滿 max retry 額度（1 + converterMaxRetriesResult = 3 attempts）")
}

// TestGetResult_ContextCancel：開 ctx 然後 cancel → 收 ctx.Err（不 retry）。
//
// 場景：server 一開始就 503，但在第 1 次 retry 退避（1s）期間 caller cancel ctx
// → 應該立即 return ctx.Err()，不再進下一輪 attempt。
func TestGetResult_ContextCancel(t *testing.T) {
	t.Parallel()

	var attempts atomic.Int32
	mux := http.NewServeMux()
	mux.HandleFunc("/api/v1/jobs/job-cancel/result", func(w http.ResponseWriter, r *http.Request) {
		attempts.Add(1)
		w.WriteHeader(http.StatusServiceUnavailable)
	})
	srv := httptest.NewServer(mux)
	t.Cleanup(srv.Close)

	cc := newConverterClientForTest(t, srv.URL)
	ctx, cancel := context.WithCancel(context.Background())
	// 100ms 後 cancel — 在第 1 次 503 後、第 1 次 retry 退避（1s）期間觸發
	time.AfterFunc(100*time.Millisecond, cancel)

	_, _, err := cc.GetResult(ctx, "job-cancel")
	require.Error(t, err)
	assert.True(t, errors.Is(err, context.Canceled),
		"ctx cancel 應立即透傳，不繼續 retry")
	// attempts 可能是 1（第 1 次 503 後在 backoff sleep 收到 cancel）
	assert.LessOrEqual(t, attempts.Load(), int32(2),
		"ctx cancel 後不應繼續 retry 到打滿額度")
}

// TestGetResult_EmptyJobID：jobID 空字串 → 立即 return error，不打網路。
func TestGetResult_EmptyJobID(t *testing.T) {
	t.Parallel()

	cc := newConverterClientForTest(t, "http://this-should-never-be-called")
	_, _, err := cc.GetResult(context.Background(), "")
	require.Error(t, err)
	assert.Contains(t, err.Error(), "jobID is required")
}

// TestParseFilenameFromContentDisposition：cover parser 的 happy / empty / malformed case。
//
// v0.6 T3 s-5 補強（reviewer T1 提的 RFC 5987 encoded form + hostile-input sub-case）：
//   - RFC 5987 encoded form（`filename*=UTF-8''...`）— 驗 Go stdlib `mime.ParseMediaType`
//     對 charset-encoded `filename*` 參數的 transparent 解碼行為
//   - Hostile-input：CRLF injection / path traversal / null byte / extreme length
//
// **重要發現**：Go stdlib `mime.ParseMediaType` 對 `filename*=UTF-8''...` 形式
// **自動 percent-decode** 並寫入 `params["filename"]`（不需 caller 端額外讀 `filename*`）。
// 即 parser 取回的字串會是 UTF-8 解碼後的值（如 `foo_✓.nef`），而非 raw URL-encoded
// （`foo_%E2%9C%93.nef`）。**且 RFC 5987 form 優先於 ASCII filename**（當兩者並存時）。
// 此行為對 visionA 無影響：
//   - flow.DownloadStream 對 filename 不依賴此 parser；用 defaultDownloadFilename(cj) 覆寫
//   - converter 端 ADR-016 §1.2 給的 filename 是 ASCII（`<stem>_<chip>.nef`）、不會走到 RFC 5987 path
//
// Hostile-input 防護：mime.ParseMediaType 對 malformed input（CRLF）回 error → parser 回
// 空字串、不 panic、不洩漏 raw input；visionA-backend handler (api/conversion.go) 對
// filename 另有 sanitize 層（CRLF / quote 移除），不依賴此 parser 做 sanitize。
func TestParseFilenameFromContentDisposition(t *testing.T) {
	t.Parallel()

	tests := []struct {
		name string
		cd   string
		want string
	}{
		{"happy_path", `attachment; filename="yolov5s_kl720.nef"`, "yolov5s_kl720.nef"},
		{"no_quotes", `attachment; filename=yolov5s_kl720.nef`, "yolov5s_kl720.nef"},
		{"empty_header", ``, ""},
		{"malformed_no_attachment", `;;;`, ""},
		{"missing_filename_param", `attachment`, ""},
		{"inline_disposition", `inline; filename="foo.bin"`, "foo.bin"},
		// === v0.6 T3 s-5 補強 ===
		// RFC 5987 encoded form — Go stdlib mime.ParseMediaType 自動 percent-decode 為 UTF-8
		// 並寫進 params["filename"]（透明行為）；對 ASCII-only 值結果就是原字串
		{"rfc5987_utf8_ascii_only", `attachment; filename*=UTF-8''yolov5s_kl720.nef`, "yolov5s_kl720.nef"},
		// RFC 5987 含 lang tag（`UTF-8'en'foo.nef`）— 同上、結果為解碼後 ASCII
		{"rfc5987_with_lang", `attachment; filename*=UTF-8'en'foo.nef`, "foo.nef"},
		// RFC 5987 含 percent-encoded UTF-8（✓ 字元）— stdlib 解碼後回 UTF-8 字串
		// 且 RFC 5987 form **優先於** ASCII fallback（當兩者並存時，stdlib 取 `filename*` 值）
		{"rfc5987_utf8_with_unicode", `attachment; filename="foo.nef"; filename*=UTF-8''foo_%E2%9C%93.nef`, "foo_✓.nef"},
		// Hostile-input 1：CRLF injection（HTTP response splitting 攻擊向量）
		// `mime.ParseMediaType` 對含 CR/LF 的 header 回 error → parser 回空字串
		{"hostile_crlf_injection", "attachment; filename=\"foo.nef\r\nSet-Cookie: evil=1\"", ""},
		// Hostile-input 2：path traversal — parser 端不做 sanitize（responsibility 在 handler）；
		// 此處只驗 parser 不 panic、不丟錯，把 raw `../../etc/passwd` 字串原樣傳出（caller 端
		// 後續的 defaultDownloadFilename / handler sanitize 會處理）
		{"hostile_path_traversal", `attachment; filename="../../etc/passwd"`, "../../etc/passwd"},
		// Hostile-input 3：null byte injection — `mime.ParseMediaType` 容忍 null byte
		// （規範未明禁），parser 把 raw 字串傳出（同上、由後續 layer sanitize）
		{"hostile_null_byte", "attachment; filename=\"foo\x00.nef\"", "foo\x00.nef"},
		// Hostile-input 4：extreme length（4KB filename）— parser 不限制長度、回 raw 字串
		// 對 visionA 影響：0（response header 4KB 在 Content-Disposition 內早就被 net/http
		// 拒絕；此 case 純驗 parser 不 OOM / 不 panic）
		{"hostile_extreme_length", `attachment; filename="` + strings.Repeat("A", 4096) + `"`, strings.Repeat("A", 4096)},
		// Hostile-input 5：empty quoted string — 合法格式、回空字串
		{"empty_quoted_filename", `attachment; filename=""`, ""},
	}
	for _, tc := range tests {
		tc := tc
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			got := parseFilenameFromContentDisposition(tc.cd)
			assert.Equal(t, tc.want, got)
		})
	}
}

// ==========================================================================
// 共用：interface 契約 + helpers
// ==========================================================================

// 確保 converterClient 滿足 ConverterClient interface（compile-time check）。
var _ ConverterClient = (*converterClient)(nil)

// zerosReader 是無限產生 0 byte 的 reader（測 streaming 用）。
type zerosReader struct{}

func (zerosReader) Read(p []byte) (int, error) {
	for i := range p {
		p[i] = 0
	}
	return len(p), nil
}

// countingReader 包一個 reader 並計數 Read 呼叫次數（給 streaming 驗證用）。
type countingReader struct {
	R     io.Reader
	calls int64 // atomic
}

func (c *countingReader) Read(p []byte) (int, error) {
	atomic.AddInt64(&c.calls, 1)
	return c.R.Read(p)
}