package integration

import (
	"context"
	"testing"
	"time"

	"github.com/bytedance/sonic"
	"github.com/hibiken/asynq"
	"github.com/redis/go-redis/v9"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/break/junhong_cmp_fiber/pkg/constants"
)

type EmailPayload struct {
	RequestID string   `json:"request_id"`
	To        string   `json:"to"`
	Subject   string   `json:"subject"`
	Body      string   `json:"body"`
	CC        []string `json:"cc,omitempty"`
}

func TestTaskSubmit(t *testing.T) {
	rdb := redis.NewClient(&redis.Options{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = rdb.Close() }()

	ctx := context.Background()
	cleanTestKeys(t, rdb, ctx)

	client := asynq.NewClient(asynq.RedisClientOpt{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = client.Close() }()

	// 构造任务载荷
	payload := &EmailPayload{
		RequestID: "test-request-001",
		To:        "test@example.com",
		Subject:   "Test Email",
		Body:      "This is a test email",
	}

	payloadBytes, err := sonic.Marshal(payload)
	require.NoError(t, err)

	// 提交任务
	task := asynq.NewTask(constants.TaskTypeEmailSend, payloadBytes)
	info, err := client.Enqueue(task,
		asynq.Queue(constants.QueueDefault),
		asynq.MaxRetry(constants.DefaultRetryMax),
	)

	// 验证
	require.NoError(t, err)
	assert.NotEmpty(t, info.ID)
	assert.Equal(t, constants.QueueDefault, info.Queue)
	assert.Equal(t, constants.DefaultRetryMax, info.MaxRetry)
}

func TestTaskPriority(t *testing.T) {
	rdb := redis.NewClient(&redis.Options{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = rdb.Close() }()

	ctx := context.Background()
	cleanTestKeys(t, rdb, ctx)

	client := asynq.NewClient(asynq.RedisClientOpt{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = client.Close() }()

	tests := []struct {
		name  string
		queue string
	}{
		{"Critical Priority", constants.QueueCritical},
		{"Default Priority", constants.QueueDefault},
		{"Low Priority", constants.QueueLow},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			payload := &EmailPayload{
				RequestID: "test-request-" + tt.queue,
				To:        "test@example.com",
				Subject:   "Test",
				Body:      "Test",
			}

			payloadBytes, err := sonic.Marshal(payload)
			require.NoError(t, err)

			task := asynq.NewTask(constants.TaskTypeEmailSend, payloadBytes)
			info, err := client.Enqueue(task, asynq.Queue(tt.queue))

			require.NoError(t, err)
			assert.Equal(t, tt.queue, info.Queue)
		})
	}
}

func TestTaskRetry(t *testing.T) {
	rdb := redis.NewClient(&redis.Options{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = rdb.Close() }()

	ctx := context.Background()
	cleanTestKeys(t, rdb, ctx)

	client := asynq.NewClient(asynq.RedisClientOpt{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = client.Close() }()

	payload := &EmailPayload{
		RequestID: "retry-test-001",
		To:        "test@example.com",
		Subject:   "Retry Test",
		Body:      "Test retry mechanism",
	}

	payloadBytes, err := sonic.Marshal(payload)
	require.NoError(t, err)

	// 提交任务并设置重试次数
	task := asynq.NewTask(constants.TaskTypeEmailSend, payloadBytes)
	info, err := client.Enqueue(task,
		asynq.MaxRetry(3),
		asynq.Timeout(30*time.Second),
	)

	require.NoError(t, err)
	assert.Equal(t, 3, info.MaxRetry)
	assert.Equal(t, 30*time.Second, info.Timeout)
}

func TestTaskIdempotency(t *testing.T) {
	rdb := redis.NewClient(&redis.Options{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = rdb.Close() }()

	ctx := context.Background()
	cleanTestKeys(t, rdb, ctx)

	requestID := "idempotent-test-" + time.Now().Format("20060102150405.000")
	lockKey := constants.RedisTaskLockKey(requestID)
	rdb.Del(ctx, lockKey)
	t.Cleanup(func() { rdb.Del(ctx, lockKey) })

	result, err := rdb.SetNX(ctx, lockKey, "1", 24*time.Hour).Result()
	require.NoError(t, err)
	assert.True(t, result, "第一次设置锁应该成功")

	// 第二次设置锁（模拟重复任务）
	result, err = rdb.SetNX(ctx, lockKey, "1", 24*time.Hour).Result()
	require.NoError(t, err)
	assert.False(t, result, "第二次设置锁应该失败（幂等性）")

	// 验证锁存在
	exists, err := rdb.Exists(ctx, lockKey).Result()
	require.NoError(t, err)
	assert.Equal(t, int64(1), exists)

	// 验证 TTL
	ttl, err := rdb.TTL(ctx, lockKey).Result()
	require.NoError(t, err)
	assert.Greater(t, ttl.Hours(), 23.0)
	assert.LessOrEqual(t, ttl.Hours(), 24.0)
}

func TestTaskStatusTracking(t *testing.T) {
	rdb := redis.NewClient(&redis.Options{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = rdb.Close() }()

	ctx := context.Background()
	cleanTestKeys(t, rdb, ctx)

	taskID := "task-123456"
	statusKey := constants.RedisTaskStatusKey(taskID)

	// 设置任务状态
	statuses := []string{"pending", "processing", "completed"}

	for _, status := range statuses {
		err := rdb.Set(ctx, statusKey, status, 7*24*time.Hour).Err()
		require.NoError(t, err)

		// 读取状态
		result, err := rdb.Get(ctx, statusKey).Result()
		require.NoError(t, err)
		assert.Equal(t, status, result)
	}

	// 验证 TTL
	ttl, err := rdb.TTL(ctx, statusKey).Result()
	require.NoError(t, err)
	assert.Greater(t, ttl.Hours(), 24.0*6)
}

func TestQueueInspection(t *testing.T) {
	rdb := redis.NewClient(&redis.Options{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = rdb.Close() }()

	ctx := context.Background()
	cleanTestKeys(t, rdb, ctx)

	client := asynq.NewClient(asynq.RedisClientOpt{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = client.Close() }()

	// 提交多个任务
	for i := 0; i < 5; i++ {
		payload := &EmailPayload{
			RequestID: "test-" + string(rune(i)),
			To:        "test@example.com",
			Subject:   "Test",
			Body:      "Test",
		}

		payloadBytes, err := sonic.Marshal(payload)
		require.NoError(t, err)

		task := asynq.NewTask(constants.TaskTypeEmailSend, payloadBytes)
		_, err = client.Enqueue(task, asynq.Queue(constants.QueueDefault))
		require.NoError(t, err)
	}

	inspector := asynq.NewInspector(asynq.RedisClientOpt{
		Addr:     testRedisAddr,
		Password: testRedisPasswd,
		DB:       testRedisDB,
	})
	defer func() { _ = inspector.Close() }()

	// 获取队列信息
	info, err := inspector.GetQueueInfo(constants.QueueDefault)
	require.NoError(t, err)
	assert.Equal(t, 5, info.Pending)
	assert.Equal(t, 0, info.Active)
}

func TestTaskSerialization(t *testing.T) {
	tests := []struct {
		name    string
		payload EmailPayload
	}{
		{
			name: "Simple Email",
			payload: EmailPayload{
				RequestID: "req-001",
				To:        "user@example.com",
				Subject:   "Hello",
				Body:      "Hello World",
			},
		},
		{
			name: "Email with CC",
			payload: EmailPayload{
				RequestID: "req-002",
				To:        "user@example.com",
				Subject:   "Hello",
				Body:      "Hello World",
				CC:        []string{"cc1@example.com", "cc2@example.com"},
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			payloadBytes, err := sonic.Marshal(tt.payload)
			require.NoError(t, err)
			assert.NotEmpty(t, payloadBytes)

			var decoded EmailPayload
			err = sonic.Unmarshal(payloadBytes, &decoded)
			require.NoError(t, err)

			assert.Equal(t, tt.payload.RequestID, decoded.RequestID)
			assert.Equal(t, tt.payload.To, decoded.To)
			assert.Equal(t, tt.payload.Subject, decoded.Subject)
			assert.Equal(t, tt.payload.Body, decoded.Body)
			assert.Equal(t, tt.payload.CC, decoded.CC)
		})
	}
}

func cleanTestKeys(t *testing.T, rdb *redis.Client, ctx context.Context) {
	t.Helper()
	prefix := "test:task:" + t.Name() + ":"
	keys, err := rdb.Keys(ctx, prefix+"*").Result()
	if err != nil {
		return
	}
	if len(keys) > 0 {
		rdb.Del(ctx, keys...)
	}
	asynqKeys, _ := rdb.Keys(ctx, "asynq:*").Result()
	if len(asynqKeys) > 0 {
		rdb.Del(ctx, asynqKeys...)
	}
}