package db

import (
	"allapp/db/repo"
	"context"
	"fmt"

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

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

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

// 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, Pool, 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
}