package integration

import (
	"context"
	"fmt"
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/golang-migrate/migrate/v4"
	_ "github.com/golang-migrate/migrate/v4/database/postgres"
	_ "github.com/golang-migrate/migrate/v4/source/file"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/testcontainers/testcontainers-go"
	testcontainers_postgres "github.com/testcontainers/testcontainers-go/modules/postgres"
	"github.com/testcontainers/testcontainers-go/wait"
	postgresDriver "gorm.io/driver/postgres"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

// TestMigration_UpAndDown 测试迁移脚本的向上和向下迁移
func TestMigration_UpAndDown(t *testing.T) {
	ctx := context.Background()

	// 启动 PostgreSQL 容器
	postgresContainer, err := testcontainers_postgres.RunContainer(ctx,
		testcontainers.WithImage("postgres:14-alpine"),
		testcontainers_postgres.WithDatabase("testdb"),
		testcontainers_postgres.WithUsername("postgres"),
		testcontainers_postgres.WithPassword("password"),
		testcontainers.WithWaitStrategy(
			wait.ForLog("database system is ready to accept connections").
				WithOccurrence(2).
				WithStartupTimeout(30*time.Second),
		),
	)
	require.NoError(t, err, "启动 PostgreSQL 容器失败")
	defer func() {
		if err := postgresContainer.Terminate(ctx); err != nil {
			t.Logf("终止容器失败: %v", err)
		}
	}()

	// 获取连接字符串
	connStr, err := postgresContainer.ConnectionString(ctx, "sslmode=disable")
	require.NoError(t, err, "获取数据库连接字符串失败")

	// 应用数据库迁移
	migrationsPath := getMigrationsPath(t)
	m, err := migrate.New(
		fmt.Sprintf("file://%s", migrationsPath),
		connStr,
	)
	require.NoError(t, err, "创建迁移实例失败")
	defer func() { _, _ = m.Close() }()

	t.Run("向上迁移", func(t *testing.T) {
		err := m.Up()
		require.NoError(t, err, "执行向上迁移失败")

		// 验证表已创建
		db, err := gorm.Open(postgresDriver.Open(connStr), &gorm.Config{
			Logger: logger.Default.LogMode(logger.Silent),
		})
		require.NoError(t, err, "连接数据库失败")

		// 检查 RBAC 表存在
		tables := []string{
			"tb_account",
			"tb_role",
			"tb_permission",
			"tb_account_role",
			"tb_role_permission",
		}

		for _, table := range tables {
			var exists bool
			err := db.Raw("SELECT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = ?)", table).Scan(&exists).Error
			assert.NoError(t, err)
			assert.True(t, exists, "表 %s 应该存在", table)
		}

		// 检查索引
		var indexCount int64
		err = db.Raw(`
			SELECT COUNT(*) FROM pg_indexes
			WHERE tablename = 'tb_account'
			AND indexname LIKE 'idx_account_%'
		`).Scan(&indexCount).Error
		assert.NoError(t, err)
		assert.Greater(t, indexCount, int64(0), "tb_account 表应该有索引")

		sqlDB, _ := db.DB()
		if sqlDB != nil {
			_ = sqlDB.Close()
		}
	})

	t.Run("向下迁移", func(t *testing.T) {
		err := m.Down()
		require.NoError(t, err, "执行向下迁移失败")

		// 验证表已删除
		db, err := gorm.Open(postgresDriver.Open(connStr), &gorm.Config{
			Logger: logger.Default.LogMode(logger.Silent),
		})
		require.NoError(t, err, "连接数据库失败")

		// 检查 RBAC 表已删除
		tables := []string{
			"tb_account",
			"tb_role",
			"tb_permission",
			"tb_account_role",
			"tb_role_permission",
		}

		for _, table := range tables {
			var exists bool
			err := db.Raw("SELECT EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = ?)", table).Scan(&exists).Error
			assert.NoError(t, err)
			assert.False(t, exists, "表 %s 应该已删除", table)
		}

		sqlDB, _ := db.DB()
		if sqlDB != nil {
			_ = sqlDB.Close()
		}
	})
}

// TestMigration_NoForeignKeys 验证迁移脚本不包含外键约束
func TestMigration_NoForeignKeys(t *testing.T) {
	// 获取迁移目录
	migrationsPath := getMigrationsPath(t)

	// 读取所有迁移文件
	files, err := filepath.Glob(filepath.Join(migrationsPath, "*.up.sql"))
	require.NoError(t, err)

	forbiddenKeywords := []string{
		"FOREIGN KEY",
		"REFERENCES",
		"ON DELETE CASCADE",
		"ON UPDATE CASCADE",
	}

	for _, file := range files {
		content, err := os.ReadFile(file)
		require.NoError(t, err)

		for _, keyword := range forbiddenKeywords {
			assert.NotContains(t, string(content), keyword,
				"迁移文件 %s 不应包含外键约束关键字: %s", filepath.Base(file), keyword)
		}
	}
}

// TestMigration_SoftDeleteSupport 验证表支持软删除
func TestMigration_SoftDeleteSupport(t *testing.T) {
	ctx := context.Background()

	// 启动 PostgreSQL 容器
	postgresContainer, err := testcontainers_postgres.RunContainer(ctx,
		testcontainers.WithImage("postgres:14-alpine"),
		testcontainers_postgres.WithDatabase("testdb"),
		testcontainers_postgres.WithUsername("postgres"),
		testcontainers_postgres.WithPassword("password"),
		testcontainers.WithWaitStrategy(
			wait.ForLog("database system is ready to accept connections").
				WithOccurrence(2).
				WithStartupTimeout(30*time.Second),
		),
	)
	require.NoError(t, err, "启动 PostgreSQL 容器失败")
	defer func() {
		if err := postgresContainer.Terminate(ctx); err != nil {
			t.Logf("终止容器失败: %v", err)
		}
	}()

	// 获取连接字符串
	connStr, err := postgresContainer.ConnectionString(ctx, "sslmode=disable")
	require.NoError(t, err, "获取数据库连接字符串失败")

	// 应用迁移
	migrationsPath := getMigrationsPath(t)
	m, err := migrate.New(
		fmt.Sprintf("file://%s", migrationsPath),
		connStr,
	)
	require.NoError(t, err, "创建迁移实例失败")
	defer func() { _, _ = m.Close() }()

	err = m.Up()
	require.NoError(t, err, "执行向上迁移失败")

	// 连接数据库验证
	db, err := gorm.Open(postgresDriver.Open(connStr), &gorm.Config{
		Logger: logger.Default.LogMode(logger.Silent),
	})
	require.NoError(t, err, "连接数据库失败")
	defer func() {
		sqlDB, _ := db.DB()
		if sqlDB != nil {
			_ = sqlDB.Close()
		}
	}()

	// 检查每个表都有 deleted_at 列和索引
	tables := []string{
		"tb_account",
		"tb_role",
		"tb_permission",
		"tb_account_role",
		"tb_role_permission",
	}

	for _, table := range tables {
		// 检查 deleted_at 列存在
		var columnExists bool
		err := db.Raw(`
			SELECT EXISTS (
				SELECT 1 FROM information_schema.columns
				WHERE table_name = ? AND column_name = 'deleted_at'
			)
		`, table).Scan(&columnExists).Error
		assert.NoError(t, err)
		assert.True(t, columnExists, "表 %s 应该有 deleted_at 列", table)
	}
}