package sync

import (
	"bookhoard/internal/database"
	"context"
	"encoding/json"
	"testing"
	"time"

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

func TestSyncQueueProcessor_EnqueueProgress(t *testing.T) {
	ctx := context.Background()
	db := setupTestDB(t)
	defer teardownTestDB(t, db)

	processor := NewSyncQueueProcessor(db)

	userID := pgtype.UUID{Bytes: uuid.New(), Valid: true}
	deviceID := pgtype.UUID{Bytes: uuid.New(), Valid: true}
	mediaItemID := pgtype.UUID{Bytes: uuid.New(), Valid: true}

	percentage := 0.45
	chapter := 3
	update := &ProgressUpdate{
		DeviceID:    deviceID,
		MediaItemID: mediaItemID,
		UserID:      userID,
		Percentage:  percentage,
		Chapter:     &chapter,
		Source:      "koreader",
		SyncMode:    "immediate",
	}

	err := processor.EnqueueProgress(update)
	require.NoError(t, err, "should enqueue progress update")

	items, err := db.ListPendingSyncQueueItems(ctx, database.ListPendingSyncQueueItemsParams{
		DeviceID: deviceID,
		Limit:    10,
	})
	require.NoError(t, err)
	assert.Len(t, items, 1, "should have one queue item")

	item := items[0]
	assert.Equal(t, "progress", item.SyncType)
	assert.Equal(t, SyncStatusPending, item.Status.String)
	assert.Equal(t, int32(PriorityPageTurn), item.Priority.Int32)

	var syncData map[string]interface{}
	err = json.Unmarshal(item.SyncData, &syncData)
	require.NoError(t, err)
	assert.Equal(t, percentage, syncData["percentage"])
	assert.Equal(t, "koreader", syncData["source"])
}

func TestCalculateNextRetry(t *testing.T) {
	processor := &SyncQueueProcessor{}

	tests := []struct {
		name     string
		attempts int32
		minDelay time.Duration
		maxDelay time.Duration
	}{
		{"Attempt 0", 0, 0, 1 * time.Second},
		{"Attempt 1", 1, 59 * time.Second, 61 * time.Second},
		{"Attempt 2", 2, 4*time.Minute + 59*time.Second, 5*time.Minute + 1*time.Second},
		{"Attempt 3", 3, 14*time.Minute + 59*time.Second, 15*time.Minute + 1*time.Second},
		{"Attempt 4", 4, 59*time.Minute + 59*time.Second, 60*time.Minute + 1*time.Second},
		{"Attempt 5", 5, 23*time.Hour + 59*time.Minute, 24*time.Hour + 1*time.Minute},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			nextRetry := processor.calculateNextRetry(tt.attempts)
			delay := nextRetry.Sub(time.Now())

			assert.GreaterOrEqual(t, delay, tt.minDelay, "delay should be at least minDelay")
			assert.LessOrEqual(t, delay, tt.maxDelay, "delay should be at most maxDelay")
		})
	}
}

func TestSyncTypeConstants(t *testing.T) {
	assert.Equal(t, "progress", SyncTypeProgress)
	assert.Equal(t, "note", SyncTypeNote)
	assert.Equal(t, "highlight", SyncTypeHighlight)
	assert.Equal(t, "bookmark", SyncTypeBookmark)
}

func TestSyncStatusConstants(t *testing.T) {
	assert.Equal(t, "pending", SyncStatusPending)
	assert.Equal(t, "processing", SyncStatusProcessing)
	assert.Equal(t, "completed", SyncStatusCompleted)
	assert.Equal(t, "failed", SyncStatusFailed)
}

func TestPriorityConstants(t *testing.T) {
	assert.Equal(t, int32(1), PriorityUserInitiated)
	assert.Equal(t, int32(2), PriorityBookCompletion)
	assert.Equal(t, int32(3), PriorityCriticalNote)
	assert.Equal(t, int32(5), PriorityPageTurn)
	assert.Equal(t, int32(7), PriorityCheckpoint)
	assert.Equal(t, int32(10), PriorityBackgroundSync)
}

func setupTestDB(t *testing.T) *database.Queries {
	ctx := context.Background()

	dbURL := "postgresql://postgres:postgres@localhost:5432/bookmann?sslmode=disable"
	dbPool, err := pgxpool.New(ctx, dbURL)
	require.NoError(t, err, "Failed to connect to test database")

	db := database.New(dbPool)

	t.Cleanup(func() {
		_, _ = dbPool.Exec(ctx, "DELETE FROM sync_queue WHERE true")
		_, _ = dbPool.Exec(ctx, "DELETE FROM reading_progress WHERE true")
		_, _ = dbPool.Exec(ctx, "DELETE FROM media_items WHERE title LIKE 'Test %'")
		_, _ = dbPool.Exec(ctx, "DELETE FROM libraries WHERE name LIKE 'Test %'")
		_, _ = dbPool.Exec(ctx, "DELETE FROM devices WHERE device_name LIKE 'Test %'")
		_, _ = dbPool.Exec(ctx, "DELETE FROM users WHERE email LIKE 'test%'")
		dbPool.Close()
	})

	return db
}

func teardownTestDB(t *testing.T, db *database.Queries) {
	// Cleanup is handled in setupTestDB via t.Cleanup
}