package model

import (
	"context"
	"testing"
	"time"

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

// readyModel 建一個 ready（UploadedAt 已設）的 model helper。
func readyModel(id, owner, visibility string) *Model {
	now := time.Now().UTC()
	return &Model{
		ID: id, OwnerUserID: owner, Name: "m-" + id,
		StorageKey: "k/" + id, FileSize: 1024,
		Source: SourceUploaded, Visibility: visibility, UploadedAt: &now,
	}
}

// TestInMemory_SaveDefaultsVisibility 驗證 Save 未設 visibility 時預設 private。
func TestInMemory_SaveDefaultsVisibility(t *testing.T) {
	ctx := context.Background()
	r := NewInMemoryRepository()
	require.NoError(t, r.Save(ctx, &Model{ID: "m", OwnerUserID: "u", Name: "n", StorageKey: "k", Source: SourceUploaded}))
	got, err := r.Get(ctx, "m")
	require.NoError(t, err)
	assert.Equal(t, VisibilityPrivate, got.Visibility, "未設 visibility 應預設 private")
}

// TestInMemory_ShareCRUD 驗證 share 的 Upsert / Get / List / Delete。
func TestInMemory_ShareCRUD(t *testing.T) {
	ctx := context.Background()
	r := NewInMemoryRepository()

	require.NoError(t, r.UpsertShare(ctx, &ModelShare{ModelID: "m", GranteeUserID: "bob", Role: "viewer", GrantedBy: "owner"}))
	got, err := r.GetShare(ctx, "m", "bob")
	require.NoError(t, err)
	assert.Equal(t, "viewer", got.Role)

	// upsert 同 grantee → 更新 role。
	require.NoError(t, r.UpsertShare(ctx, &ModelShare{ModelID: "m", GranteeUserID: "bob", Role: "editor", GrantedBy: "owner"}))
	got, err = r.GetShare(ctx, "m", "bob")
	require.NoError(t, err)
	assert.Equal(t, "editor", got.Role, "重複 upsert 應更新 role")

	// list
	require.NoError(t, r.UpsertShare(ctx, &ModelShare{ModelID: "m", GranteeUserID: "alice", Role: "viewer", GrantedBy: "owner"}))
	shares, err := r.ListShares(ctx, "m")
	require.NoError(t, err)
	assert.Len(t, shares, 2)

	// delete
	require.NoError(t, r.DeleteShare(ctx, "m", "bob"))
	_, err = r.GetShare(ctx, "m", "bob")
	assert.ErrorIs(t, err, ErrNotFound)

	// delete 不存在 → ErrNotFound
	assert.ErrorIs(t, r.DeleteShare(ctx, "m", "ghost"), ErrNotFound)
}

// TestInMemory_LibraryVisibility 驗證 Library predicate：我的 ∪ public ∪ shared，排除別人 private。
func TestInMemory_LibraryVisibility(t *testing.T) {
	ctx := context.Background()
	r := NewInMemoryRepository()

	require.NoError(t, r.Save(ctx, readyModel("mine", "me", VisibilityPrivate)))
	require.NoError(t, r.Save(ctx, readyModel("otherPriv", "other", VisibilityPrivate)))
	require.NoError(t, r.Save(ctx, readyModel("otherPub", "other", VisibilityPublic)))
	require.NoError(t, r.Save(ctx, readyModel("otherShared", "other", VisibilityPrivate)))
	require.NoError(t, r.UpsertShare(ctx, &ModelShare{ModelID: "otherShared", GranteeUserID: "me", Role: "viewer", GrantedBy: "other"}))

	items, _, err := r.Library(ctx, LibraryQuery{UserID: "me", Limit: 100})
	require.NoError(t, err)

	ids := map[string]*LibraryItem{}
	for _, it := range items {
		ids[it.Model.ID] = it
	}
	assert.Contains(t, ids, "mine")
	assert.Contains(t, ids, "otherPub")
	assert.Contains(t, ids, "otherShared")
	assert.NotContains(t, ids, "otherPriv", "別人 private 不應可見")
	assert.True(t, ids["otherShared"].SharedWithMe)
	assert.Equal(t, AccessOwner, ids["mine"].MyAccess)
}

// TestInMemory_LibraryExcludesNotReady 驗證未 ready 的 model 不進 Library。
func TestInMemory_LibraryExcludesNotReady(t *testing.T) {
	ctx := context.Background()
	r := NewInMemoryRepository()
	require.NoError(t, r.Save(ctx, &Model{ID: "pending", OwnerUserID: "me", Name: "p", StorageKey: "k", Source: SourceUploaded, Visibility: VisibilityPublic}))

	items, _, err := r.Library(ctx, LibraryQuery{UserID: "me", Limit: 100})
	require.NoError(t, err)
	assert.Empty(t, items)
}

// TestInMemory_LibraryTenantStub 驗證 tenant 可見性：有 org 對應才命中（in-memory 用 SetUserOrg 模擬）。
func TestInMemory_LibraryTenantStub(t *testing.T) {
	ctx := context.Background()
	r := NewInMemoryRepository()
	r.SetUserOrg("owner", "org-1")
	r.SetUserOrg("teammate", "org-1")
	r.SetUserOrg("outsider", "org-2")
	require.NoError(t, r.Save(ctx, readyModel("tenantModel", "owner", VisibilityTenant)))

	// 同 org → 可見
	items, _, err := r.Library(ctx, LibraryQuery{UserID: "teammate", UserOrgID: "org-1", Limit: 100})
	require.NoError(t, err)
	require.Len(t, items, 1)
	assert.Equal(t, "tenantModel", items[0].Model.ID)

	// 異 org → 不可見
	items, _, err = r.Library(ctx, LibraryQuery{UserID: "outsider", UserOrgID: "org-2", Limit: 100})
	require.NoError(t, err)
	assert.Empty(t, items, "異 org 不應看到 tenant model")

	// 無 org（OIDC 現況）→ 不可見（安全預設）
	items, _, err = r.Library(ctx, LibraryQuery{UserID: "teammate", UserOrgID: "", Limit: 100})
	require.NoError(t, err)
	assert.Empty(t, items, "無 org 不應命中 tenant")
}

// TestInMemory_LibraryPaginationStable 驗證 cursor 分頁不重不漏。
func TestInMemory_LibraryPaginationStable(t *testing.T) {
	ctx := context.Background()
	r := NewInMemoryRepository()
	for i := 0; i < 5; i++ {
		require.NoError(t, r.Save(ctx, readyModel(string(rune('a'+i)), "me", VisibilityPrivate)))
	}

	seen := map[string]bool{}
	var cursor *Cursor
	for page := 0; page < 10; page++ {
		items, hasMore, err := r.Library(ctx, LibraryQuery{
			UserID: "me", Limit: 2, Sort: "name", Order: "asc", Cursor: cursor,
		})
		require.NoError(t, err)
		for _, it := range items {
			assert.False(t, seen[it.Model.ID], "分頁重複 %s", it.Model.ID)
			seen[it.Model.ID] = true
		}
		if !hasMore {
			break
		}
		last := items[len(items)-1].Model
		cursor = &Cursor{ID: last.ID, SortValue: last.Name}
	}
	assert.Len(t, seen, 5, "所有 model 應被分頁走過一次")
}