package model

import (
	"sync"
	"testing"

	"github.com/glebarez/sqlite"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

func setupUserAssetChannelDB(t *testing.T) *gorm.DB {
	t.Helper()

	db, err := gorm.Open(sqlite.Open("file:user_asset_channels?mode=memory&cache=shared"), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	require.NoError(t, err)

	sqlDB, err := db.DB()
	require.NoError(t, err)
	sqlDB.SetMaxOpenConns(1)

	origDB := DB
	origGroupCol := commonGroupCol
	DB = db
	commonGroupCol = "`group`"

	require.NoError(t, db.AutoMigrate(&UserAssetChannel{}))

	t.Cleanup(func() {
		DB = origDB
		commonGroupCol = origGroupCol
		require.NoError(t, sqlDB.Close())
	})

	return db
}

func TestGetUserAssetChannel_NotFound(t *testing.T) {
	setupUserAssetChannelDB(t)

	binding, err := GetUserAssetChannel(1, 2, "default")
	require.NoError(t, err)
	assert.Nil(t, binding)
}

func TestBindUserAssetChannel_CreateAndUpdate(t *testing.T) {
	db := setupUserAssetChannelDB(t)

	require.NoError(t, BindUserAssetChannel(1, 2, "default", 100))

	binding, err := GetUserAssetChannel(1, 2, "default")
	require.NoError(t, err)
	require.NotNil(t, binding)
	assert.Equal(t, 100, binding.ChannelId)
	assert.NotZero(t, binding.CreatedAt)
	assert.NotZero(t, binding.UpdatedAt)

	require.NoError(t, BindUserAssetChannel(1, 2, "default", 200))

	binding, err = GetUserAssetChannel(1, 2, "default")
	require.NoError(t, err)
	require.NotNil(t, binding)
	assert.Equal(t, 200, binding.ChannelId)

	var count int64
	require.NoError(t, db.Model(&UserAssetChannel{}).Count(&count).Error)
	assert.Equal(t, int64(1), count)
}

func TestGetUserAssetChannelsByTypesSortsLatestFirst(t *testing.T) {
	db := setupUserAssetChannelDB(t)
	require.NoError(t, BindUserAssetChannel(1, 2, "default", 100))
	require.NoError(t, BindUserAssetChannel(1, 3, "default", 200))
	require.NoError(t, BindUserAssetChannel(1, 4, "default", 300))
	require.NoError(t, db.Model(&UserAssetChannel{}).
		Where("user_id = ? AND channel_type = ?", 1, 2).
		Update("updated_at", int64(100)).Error)
	require.NoError(t, db.Model(&UserAssetChannel{}).
		Where("user_id = ? AND channel_type = ?", 1, 3).
		Update("updated_at", int64(200)).Error)

	bindings, err := GetUserAssetChannelsByTypes(1, []int{2, 3}, "default")

	require.NoError(t, err)
	require.Len(t, bindings, 2)
	assert.Equal(t, 3, bindings[0].ChannelType)
	assert.Equal(t, 200, bindings[0].ChannelId)
	assert.Equal(t, 2, bindings[1].ChannelType)
}

func TestBindUserAssetChannelWithTxUpserts(t *testing.T) {
	db := setupUserAssetChannelDB(t)

	require.NoError(t, BindUserAssetChannel(1, 2, "default", 100))
	require.NoError(t, BindUserAssetChannel(1, 2, "default", 200))

	binding, err := GetUserAssetChannel(1, 2, "default")
	require.NoError(t, err)
	require.NotNil(t, binding)
	assert.Equal(t, 200, binding.ChannelId)

	var count int64
	require.NoError(t, db.Model(&UserAssetChannel{}).Count(&count).Error)
	assert.Equal(t, int64(1), count)
}

func TestDeleteUserAssetChannelsByTypesWithTxDeletesOnlyRequestedRows(t *testing.T) {
	db := setupUserAssetChannelDB(t)
	require.NoError(t, BindUserAssetChannel(1, 2, "default", 100))
	require.NoError(t, BindUserAssetChannel(1, 3, "default", 200))
	require.NoError(t, BindUserAssetChannel(1, 4, "default", 300))
	require.NoError(t, BindUserAssetChannel(1, 2, "vip", 400))
	require.NoError(t, BindUserAssetChannel(2, 2, "default", 500))

	require.NoError(t, db.Transaction(func(tx *gorm.DB) error {
		return DeleteUserAssetChannelsByTypesWithTx(tx, 1, []int{2, 3}, "default")
	}))

	binding, err := GetUserAssetChannel(1, 2, "default")
	require.NoError(t, err)
	assert.Nil(t, binding)
	binding, err = GetUserAssetChannel(1, 3, "default")
	require.NoError(t, err)
	assert.Nil(t, binding)
	binding, err = GetUserAssetChannel(1, 4, "default")
	require.NoError(t, err)
	require.NotNil(t, binding)
	assert.Equal(t, 300, binding.ChannelId)
	binding, err = GetUserAssetChannel(1, 2, "vip")
	require.NoError(t, err)
	require.NotNil(t, binding)
	assert.Equal(t, 400, binding.ChannelId)
	binding, err = GetUserAssetChannel(2, 2, "default")
	require.NoError(t, err)
	require.NotNil(t, binding)
	assert.Equal(t, 500, binding.ChannelId)
}

func TestBindUserAssetChannel_IsolatesUserTypeGroup(t *testing.T) {
	setupUserAssetChannelDB(t)

	require.NoError(t, BindUserAssetChannel(1, 2, "default", 100))
	require.NoError(t, BindUserAssetChannel(2, 2, "default", 200))
	require.NoError(t, BindUserAssetChannel(1, 3, "default", 300))
	require.NoError(t, BindUserAssetChannel(1, 2, "vip", 400))

	cases := []struct {
		userId      int
		channelType int
		group       string
		channelId   int
	}{
		{1, 2, "default", 100},
		{2, 2, "default", 200},
		{1, 3, "default", 300},
		{1, 2, "vip", 400},
	}

	for _, tc := range cases {
		binding, err := GetUserAssetChannel(tc.userId, tc.channelType, tc.group)
		require.NoError(t, err)
		require.NotNil(t, binding)
		assert.Equal(t, tc.channelId, binding.ChannelId)
	}
}

func TestBindUserAssetChannel_ConcurrentUpsert(t *testing.T) {
	db := setupUserAssetChannelDB(t)

	const workers = 20
	var wg sync.WaitGroup
	errCh := make(chan error, workers)
	expected := make(map[int]bool, workers)

	for i := 0; i < workers; i++ {
		channelId := 1000 + i
		expected[channelId] = true
		wg.Add(1)
		go func() {
			defer wg.Done()
			errCh <- BindUserAssetChannel(1, 2, "default", channelId)
		}()
	}

	wg.Wait()
	close(errCh)
	for err := range errCh {
		require.NoError(t, err)
	}

	var count int64
	require.NoError(t, db.Model(&UserAssetChannel{}).Count(&count).Error)
	assert.Equal(t, int64(1), count)

	binding, err := GetUserAssetChannel(1, 2, "default")
	require.NoError(t, err)
	require.NotNil(t, binding)
	assert.True(t, expected[binding.ChannelId])
}

func TestUnbindUserAssetChannel(t *testing.T) {
	setupUserAssetChannelDB(t)

	require.NoError(t, BindUserAssetChannel(1, 2, "default", 100))
	require.NoError(t, BindUserAssetChannel(1, 2, "vip", 200))

	require.NoError(t, UnbindUserAssetChannel(1, 2, "default"))

	binding, err := GetUserAssetChannel(1, 2, "default")
	require.NoError(t, err)
	assert.Nil(t, binding)

	binding, err = GetUserAssetChannel(1, 2, "vip")
	require.NoError(t, err)
	require.NotNil(t, binding)
	assert.Equal(t, 200, binding.ChannelId)
}