package main

// firmware_close_guard_test.go — M9-4.5：Wails OnBeforeClose firmware-aware 攔截邏輯測試
//
// 覆蓋情境：
//  1. forceCloseAccepted=true → 放行（return false）、旗標被清掉
//  2. server port=0 → 放行
//  3. queryFirmwareTasks 失敗 → fail-open 放行
//  4. hasActive=false → 放行、不 emit event
//  5. hasActive=true → emit event + return true（prevent）、payload schema 正確
//  6. ConfirmForceClose → 設旗標 + 下次 evaluateClose 放行
//  7. nil deps → 防呆放行
//  8. concurrent ConfirmForceClose 與 evaluateClose → race-free

import (
	"context"
	"errors"
	"sync"
	"sync/atomic"
	"testing"
)

// fakeCloseGuardDeps 是 CloseGuardDeps 的 test double。
type fakeCloseGuardDeps struct {
	mu sync.Mutex

	port            int
	queryResp       FirmwareActiveTasksResponse
	queryErr        error
	queryCalls      int
	emitCalls       int
	lastEmitPayload map[string]interface{}
	logLines        []string
}

func (f *fakeCloseGuardDeps) ServerPort() int {
	f.mu.Lock()
	defer f.mu.Unlock()
	return f.port
}

func (f *fakeCloseGuardDeps) QueryFirmwareTasks(ctx context.Context, port int) (FirmwareActiveTasksResponse, error) {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.queryCalls++
	return f.queryResp, f.queryErr
}

func (f *fakeCloseGuardDeps) EmitFirmwareInProgress(payload map[string]interface{}) {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.emitCalls++
	f.lastEmitPayload = payload
}

func (f *fakeCloseGuardDeps) AppLog(format string, args ...interface{}) {
	f.mu.Lock()
	defer f.mu.Unlock()
	f.logLines = append(f.logLines, format)
}

// ──────────────────────────────────────────────────────────────────────
// 1. forceCloseAccepted=true → 放行、旗標清空
// ──────────────────────────────────────────────────────────────────────

func TestEvaluateClose_ForceAccepted(t *testing.T) {
	g := NewFirmwareCloseGuard()
	g.ConfirmForceClose()

	deps := &fakeCloseGuardDeps{
		port:      8080,
		queryResp: FirmwareActiveTasksResponse{HasActive: true}, // 即使有 active task 也該放行
	}

	prevent := g.evaluateClose(context.Background(), deps)
	if prevent {
		t.Errorf("expected prevent=false when force accepted, got true")
	}
	// queryFirmwareTasks 不該被叫（force-close 短路）
	if deps.queryCalls != 0 {
		t.Errorf("expected queryFirmwareTasks NOT called on force accept, got %d", deps.queryCalls)
	}
	if deps.emitCalls != 0 {
		t.Errorf("expected no emit on force accept, got %d", deps.emitCalls)
	}

	// 旗標應該已被清掉、下次呼叫如沒 active 才放行
	deps.queryResp = FirmwareActiveTasksResponse{HasActive: true, Tasks: []FirmwareActiveTaskSummary{{TaskID: "x"}}}
	prevent2 := g.evaluateClose(context.Background(), deps)
	if !prevent2 {
		t.Errorf("expected prevent=true on 2nd call (flag cleared), got false")
	}
}

// ──────────────────────────────────────────────────────────────────────
// 2. server port<=0 → 放行
// ──────────────────────────────────────────────────────────────────────

func TestEvaluateClose_ServerNotRunning(t *testing.T) {
	g := NewFirmwareCloseGuard()
	deps := &fakeCloseGuardDeps{port: 0}
	prevent := g.evaluateClose(context.Background(), deps)
	if prevent {
		t.Errorf("expected prevent=false when server not running")
	}
	if deps.queryCalls != 0 {
		t.Errorf("expected queryFirmwareTasks NOT called when port=0, got %d", deps.queryCalls)
	}
}

// ──────────────────────────────────────────────────────────────────────
// 3. queryFirmwareTasks 失敗 → fail-open 放行
// ──────────────────────────────────────────────────────────────────────

func TestEvaluateClose_QueryError_FailOpen(t *testing.T) {
	g := NewFirmwareCloseGuard()
	deps := &fakeCloseGuardDeps{
		port:     3721,
		queryErr: errors.New("connection refused"),
	}
	prevent := g.evaluateClose(context.Background(), deps)
	if prevent {
		t.Errorf("expected prevent=false (fail-open) on query error, got true")
	}
	if deps.queryCalls != 1 {
		t.Errorf("expected queryFirmwareTasks called once, got %d", deps.queryCalls)
	}
	if deps.emitCalls != 0 {
		t.Errorf("expected no emit on query error, got %d", deps.emitCalls)
	}
}

// ──────────────────────────────────────────────────────────────────────
// 4. hasActive=false → 放行、不 emit
// ──────────────────────────────────────────────────────────────────────

func TestEvaluateClose_NoActiveTask(t *testing.T) {
	g := NewFirmwareCloseGuard()
	deps := &fakeCloseGuardDeps{
		port:      3721,
		queryResp: FirmwareActiveTasksResponse{HasActive: false, Tasks: []FirmwareActiveTaskSummary{}},
	}
	prevent := g.evaluateClose(context.Background(), deps)
	if prevent {
		t.Errorf("expected prevent=false when no active task")
	}
	if deps.emitCalls != 0 {
		t.Errorf("expected no emit when no active task, got %d", deps.emitCalls)
	}
}

// ──────────────────────────────────────────────────────────────────────
// 5. hasActive=true → emit event + return true、payload schema 正確
// ──────────────────────────────────────────────────────────────────────

func TestEvaluateClose_HasActive_PreventAndEmit(t *testing.T) {
	g := NewFirmwareCloseGuard()
	deps := &fakeCloseGuardDeps{
		port: 3721,
		queryResp: FirmwareActiveTasksResponse{
			HasActive: true,
			Tasks: []FirmwareActiveTaskSummary{
				{
					TaskID:     "upgrade-KL520-0",
					DeviceID:   "kl520-0",
					DeviceName: "KL520 #1",
					Chip:       "KL520",
					Direction:  "upgrade",
					Stage:      "flashing",
					ElapsedMs:  12000,
					EtaSeconds: 45,
				},
			},
		},
	}
	prevent := g.evaluateClose(context.Background(), deps)
	if !prevent {
		t.Errorf("expected prevent=true on active task")
	}
	if deps.emitCalls != 1 {
		t.Errorf("expected emit called once, got %d", deps.emitCalls)
	}
	// payload schema：hasActive + tasks(slice) 必須存在
	if deps.lastEmitPayload["hasActive"] != true {
		t.Errorf("expected payload.hasActive=true, got %v", deps.lastEmitPayload["hasActive"])
	}
	tasksAny, ok := deps.lastEmitPayload["tasks"].([]interface{})
	if !ok {
		t.Fatalf("expected payload.tasks []interface{}, got %T", deps.lastEmitPayload["tasks"])
	}
	if len(tasksAny) != 1 {
		t.Fatalf("expected 1 task in payload, got %d", len(tasksAny))
	}
	task, ok := tasksAny[0].(map[string]interface{})
	if !ok {
		t.Fatalf("expected task is map, got %T", tasksAny[0])
	}
	// 重要欄位 frontend modal 會用
	if task["taskId"] != "upgrade-KL520-0" {
		t.Errorf("expected taskId, got %v", task["taskId"])
	}
	if task["deviceName"] != "KL520 #1" {
		t.Errorf("expected deviceName, got %v", task["deviceName"])
	}
	if task["chip"] != "KL520" {
		t.Errorf("expected chip, got %v", task["chip"])
	}
	if task["stage"] != "flashing" {
		t.Errorf("expected stage, got %v", task["stage"])
	}
	if task["etaSeconds"] != 45 {
		t.Errorf("expected etaSeconds=45, got %v", task["etaSeconds"])
	}
}

// ──────────────────────────────────────────────────────────────────────
// 6. ConfirmForceClose 設旗標
// ──────────────────────────────────────────────────────────────────────

func TestConfirmForceClose_SetsAndConsumesFlag(t *testing.T) {
	g := NewFirmwareCloseGuard()
	if g.consumeForceCloseAccepted() {
		t.Errorf("expected default flag=false")
	}
	g.ConfirmForceClose()
	if !g.consumeForceCloseAccepted() {
		t.Errorf("expected flag=true after ConfirmForceClose")
	}
	// consume 後旗標清掉
	if g.consumeForceCloseAccepted() {
		t.Errorf("expected flag=false after consume")
	}
}

// ──────────────────────────────────────────────────────────────────────
// 7. nil deps → 防呆放行
// ──────────────────────────────────────────────────────────────────────

func TestEvaluateClose_NilDeps(t *testing.T) {
	g := NewFirmwareCloseGuard()
	prevent := g.evaluateClose(context.Background(), nil)
	if prevent {
		t.Errorf("expected prevent=false with nil deps (defensive)")
	}
}

// ──────────────────────────────────────────────────────────────────────
// 8. concurrent ConfirmForceClose 與 evaluateClose 不 race（-race 模式）
// ──────────────────────────────────────────────────────────────────────

func TestConfirmForceClose_ConcurrentAccess(t *testing.T) {
	g := NewFirmwareCloseGuard()
	deps := &fakeCloseGuardDeps{port: 3721, queryResp: FirmwareActiveTasksResponse{HasActive: false}}

	const N = 100
	var wg sync.WaitGroup
	var preventCount, allowCount int64

	for i := 0; i < N; i++ {
		wg.Add(2)
		go func() {
			defer wg.Done()
			g.ConfirmForceClose()
		}()
		go func() {
			defer wg.Done()
			prevent := g.evaluateClose(context.Background(), deps)
			if prevent {
				atomic.AddInt64(&preventCount, 1)
			} else {
				atomic.AddInt64(&allowCount, 1)
			}
		}()
	}
	wg.Wait()

	// 不檢查具體 prevent/allow 數量（race condition between Confirm + Evaluate
	// 順序不可預期）、只驗 -race 模式沒抓到 race
	t.Logf("concurrent stress: prevent=%d allow=%d (race-free under -race)", preventCount, allowCount)
}