package db

import (
	"cn/oneao/base-go/conf"
	"cn/oneao/base-go/db/repo"
	"context"
	"fmt"
	"time"

	"github.com/jackc/pgx/v5"
	"github.com/jackc/pgx/v5/pgxpool"
)

var (
	DB      *pgxpool.Pool
	Queries *repo.Queries
)

type SQLCBatch interface {
	Exec(func(int, error))
}

func InitDB() {
	cfg := conf.GetConf().Pgsql

	sslMode := "disable"
	if cfg.SllMode {
		sslMode = "require"
	}

	dsn := fmt.Sprintf(
		"postgres://%s:%s@%s:%d/%s?sslmode=%s&TimeZone=%s",
		cfg.User, cfg.Password, cfg.Host, cfg.Port, cfg.Dbname, sslMode, cfg.TimeZone,
	)

	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()

	// 使用可修改配置
	cfgPool, err := pgxpool.ParseConfig(dsn)
	if err != nil {
		panic(err)
	}

	// 给连接池参数设置默认值
	if cfg.MaxOpenConns <= 0 {
		cfg.MaxOpenConns = 10
	}
	if cfg.MaxIdleConns <= 0 {
		cfg.MaxIdleConns = 5
	}
	if cfg.ConnMaxLifetime <= 0 {
		cfg.ConnMaxLifetime = 30 * time.Minute
	}

	cfgPool.MaxConns = cfg.MaxOpenConns
	cfgPool.MinConns = cfg.MaxIdleConns
	cfgPool.MaxConnLifetime = cfg.ConnMaxLifetime

	pool, err := pgxpool.NewWithConfig(ctx, cfgPool)
	if err != nil {
		panic(err)
	}

	// 测试连接
	if err := pool.Ping(ctx); err != nil {
		panic(err)
	}

	DB = pool
	Queries = repo.New(DB)
}

// WithTx 执行事务，支持 panic 和 error 自动回滚
// 默认使用全局 DB，调用更简洁
func WithTx(ctx context.Context, fn func(q *repo.Queries) error) (err error) {
	return WithTxPool(ctx, DB, fn)
}

// WithTxPool 支持自定义连接池
func WithTxPool(ctx context.Context, pool *pgxpool.Pool, fn func(q *repo.Queries) error) (err error) {
	tx, err := pool.BeginTx(ctx, pgx.TxOptions{})
	if err != nil {
		return err
	}

	defer func() {
		if p := recover(); p != nil {
			// panic 时回滚事务
			if rbErr := tx.Rollback(ctx); rbErr != nil {
				fmt.Printf("rollback failed during panic: %v\n", rbErr)
			}
			panic(p)
		} else if err != nil {
			// 回滚事务，并捕获 rollback 错误
			if rbErr := tx.Rollback(ctx); rbErr != nil {
				err = fmt.Errorf("rollback failed: %v, original error: %w", rbErr, err)
			}
		} else {
			// 提交事务，并捕获 commit 错误
			if commitErr := tx.Commit(ctx); commitErr != nil {
				err = fmt.Errorf("commit failed: %w", commitErr)
			}
		}
	}()

	q := Queries.WithTx(tx)
	err = fn(q)
	return err
}

// RunBatch 通用批处理执行器（适配所有 sqlc Batch）
func RunBatch(ctx context.Context, batch SQLCBatch) error {
	var firstErr error

	batch.Exec(func(i int, err error) {
		if err != nil && firstErr == nil {
			firstErr = err
		}
	})

	return firstErr
}