package main

import (
	"context"
	"net/http"
	"net/http/httptest"
	"testing"

	"bookhoard/internal/database"

	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgtype"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// unlinkedBooksFixture is one user + device + two queue rows. The regular
// user's cleanup cascades: users → devices → unlinked_books.
type unlinkedBooksFixture struct {
	setup     *TestServerSetup
	owner     UserTestData
	ownerTok  string
	deviceID  pgtype.UUID
	contentA  string
	contentB  string
	rowA      pgtype.UUID
	rowB      pgtype.UUID
}

func setupUnlinkedBooksFixture(t *testing.T) *unlinkedBooksFixture {
	f := &unlinkedBooksFixture{setup: setupTestServer(t), contentA: "test-content-aaa", contentB: "test-content-bbb"}
	f.owner = createRegularUserOnce(t, f.setup.DB)
	f.ownerTok = loginUserWithCredentials(t, f.setup.Server, f.owner.Email, f.owner.Password)

	device, err := f.setup.DB.CreateDevice(context.Background(), database.CreateDeviceParams{
		UserID:               pgtype.UUID{Bytes: [16]byte(f.owner.ID), Valid: true},
		DeviceName:           "test-unlinked-reader",
		DeviceType:           "koreader",
		DeviceIdentifier:     "test-unlinked-" + uuid.New().String()[:8],
		AuthToken:            "dev_test_" + uuid.New().String(),
		SyncEnabled:          pgtype.Bool{Bool: true, Valid: true},
		AutoSync:             pgtype.Bool{Bool: true, Valid: true},
		SyncFrequencyMinutes: pgtype.Int4{Int32: 5, Valid: true},
		DeviceMetadata:       []byte("{}"),
	})
	require.NoError(t, err, "device for unlinked-books tests")
	f.deviceID = device.ID

	f.rowA = f.seedRow(t, f.contentA, "Test Book A")
	f.rowB = f.seedRow(t, f.contentB, "Test Book B")
	return f
}

// seedRow inserts one queue row for the fixture device.
func (f *unlinkedBooksFixture) seedRow(t *testing.T, contentID, title string) pgtype.UUID {
	row, err := f.setup.DB.CreateUnlinkedBook(context.Background(), database.CreateUnlinkedBookParams{
		DeviceID:  f.deviceID,
		ContentID: contentID,
		Title:     pgtype.Text{String: title, Valid: true},
	})
	require.NoError(t, err, "seed unlinked_books row")
	return row.ID
}

// doAction fires an htmx-style page action as the given user.
func (f *unlinkedBooksFixture) doAction(t *testing.T, token, method, path string) *httptest.ResponseRecorder {
	req := httptest.NewRequest(method, path, nil)
	req.Header.Set("Authorization", "Bearer "+token)
	req.Header.Set("Cookie", "token="+token)
	req.Header.Set("HX-Request", "true")
	rec := httptest.NewRecorder()
	f.setup.Server.Config.Handler.ServeHTTP(rec, req)
	return rec
}

func (f *unlinkedBooksFixture) unresolvedCount(t *testing.T) int {
	rows, err := f.setup.DB.ListUnresolvedUnlinkedBooksForUser(context.Background(),
		pgtype.UUID{Bytes: [16]byte(f.owner.ID), Valid: true})
	require.NoError(t, err)
	return len(rows)
}

func (f *unlinkedBooksFixture) ignoredIDs(t *testing.T) []uuid.UUID {
	rows, err := f.setup.DB.ListIgnoredUnlinkedBooksForUser(context.Background(),
		pgtype.UUID{Bytes: [16]byte(f.owner.ID), Valid: true})
	require.NoError(t, err)
	ids := make([]uuid.UUID, 0, len(rows))
	for _, r := range rows {
		ids = append(ids, uuid.UUID(r.ID.Bytes))
	}
	return ids
}

// TestUnlinkedBooksIgnoreLifecycle pins the soft-dismiss contract: hidden
// from the page list, badge count, and per-device API; preserved across
// the sync upsert; reversible via unignore. Hard delete is covered too.
func TestUnlinkedBooksIgnoreLifecycle(t *testing.T) {
	f := setupUnlinkedBooksFixture(t)
	ctx := context.Background()
	pathA := "/unlinked-books/" + uuid.UUID(f.rowA.Bytes).String()
	pathB := "/unlinked-books/" + uuid.UUID(f.rowB.Bytes).String()

	t.Run("ignore hides the row everywhere", func(t *testing.T) {
		rec := f.doAction(t, f.ownerTok, "POST", pathA+"/ignore")
		require.Equal(t, http.StatusOK, rec.Code, rec.Body.String())
		// The htmx swap re-renders the whole section partial.
		assert.Contains(t, rec.Body.String(), `id="unlinked-section"`)

		assert.Equal(t, 1, f.unresolvedCount(t), "row B remains queued")
		ignored := f.ignoredIDs(t)
		require.Len(t, ignored, 1)
		assert.Equal(t, uuid.UUID(f.rowA.Bytes), ignored[0])

		count, err := f.setup.DB.CountUnresolvedUnlinkedBooksForUser(ctx, pgtype.UUID{Bytes: [16]byte(f.owner.ID), Valid: true})
		require.NoError(t, err)
		assert.Equal(t, int64(1), count, "dashboard badge must still count row B only")

		perDevice, err := f.setup.DB.GetUnlinkedBooksByDevice(ctx, f.deviceID)
		require.NoError(t, err)
		assert.Len(t, perDevice, 1, "per-device API must hide the ignored row")
		deviceCount, err := f.setup.DB.CountUnlinkedBooks(ctx, f.deviceID)
		require.NoError(t, err)
		assert.Equal(t, int64(1), deviceCount)
	})

	t.Run("device sync refresh preserves the ignore", func(t *testing.T) {
		// The exact query the KOReader sync path runs on every re-sync.
		_, err := f.setup.DB.UpsertUnlinkedBook(ctx, database.UpsertUnlinkedBookParams{
			DeviceID:  f.deviceID,
			ContentID: f.contentA,
			Title:     pgtype.Text{String: "Test Book A (restored metadata)", Valid: true},
		})
		require.NoError(t, err)

		row, err := f.setup.DB.GetUnlinkedBookByID(ctx, f.rowA)
		require.NoError(t, err)
		assert.True(t, row.IgnoredAt.Valid, "upsert must never clear ignored_at")
		assert.Equal(t, "Test Book A (restored metadata)", row.Title.String, "upsert still refreshes metadata")
		assert.Equal(t, 1, f.unresolvedCount(t), "ignored row must not re-enter the queue")
	})

	t.Run("unignore restores the row to the queue", func(t *testing.T) {
		rec := f.doAction(t, f.ownerTok, "POST", pathA+"/unignore")
		require.Equal(t, http.StatusOK, rec.Code, rec.Body.String())

		assert.Equal(t, 2, f.unresolvedCount(t))
		assert.Empty(t, f.ignoredIDs(t))
		row, err := f.setup.DB.GetUnlinkedBookByID(ctx, f.rowA)
		require.NoError(t, err)
		assert.False(t, row.IgnoredAt.Valid)
	})

	t.Run("delete removes the row outright", func(t *testing.T) {
		rec := f.doAction(t, f.ownerTok, "DELETE", pathB)
		require.Equal(t, http.StatusOK, rec.Code, rec.Body.String())

		_, err := f.setup.DB.GetUnlinkedBookByID(ctx, f.rowB)
		assert.Error(t, err, "hard-deleted row must be gone")
		assert.Equal(t, 1, f.unresolvedCount(t))
	})

	t.Run("unknown and malformed ids are rejected", func(t *testing.T) {
		rec := f.doAction(t, f.ownerTok, "DELETE", "/unlinked-books/"+uuid.New().String())
		assert.Equal(t, http.StatusNotFound, rec.Code)
		rec = f.doAction(t, f.ownerTok, "POST", "/unlinked-books/not-a-uuid/ignore")
		assert.Equal(t, http.StatusBadRequest, rec.Code)
	})
}

// TestUnlinkedBooksOwnership pins row → device → user authorization:
// another user's queue rows are untouchable, ignored or deleted.
func TestUnlinkedBooksOwnership(t *testing.T) {
	f := setupUnlinkedBooksFixture(t)

	stranger := createRegularUserOnce(t, f.setup.DB)
	strangerTok := loginUserWithCredentials(t, f.setup.Server, stranger.Email, stranger.Password)
	pathA := "/unlinked-books/" + uuid.UUID(f.rowA.Bytes).String()

	rec := f.doAction(t, strangerTok, "POST", pathA+"/ignore")
	assert.Equal(t, http.StatusForbidden, rec.Code)
	row, err := f.setup.DB.GetUnlinkedBookByID(context.Background(), f.rowA)
	require.NoError(t, err)
	assert.False(t, row.IgnoredAt.Valid, "foreign ignore must not land")

	rec = f.doAction(t, strangerTok, "DELETE", pathA)
	assert.Equal(t, http.StatusForbidden, rec.Code)
	_, err = f.setup.DB.GetUnlinkedBookByID(context.Background(), f.rowA)
	assert.NoError(t, err, "foreign delete must not land")
}