"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.PostgreSQLConnector = void 0;
const tslib_1 = require("tslib");
const pg_1 = require("pg");
const uuid_1 = require("uuid");
const assert_1 = tslib_1.__importDefault(require("assert"));
class PostgreSQLConnector {
    pool;
    configuration;
    txnDict;
    constructor(configuration) {
        this.configuration = configuration;
        this.txnDict = {};
        this.pool = new pg_1.Pool(configuration);
        // 错误处理
        this.pool.on('error', (err) => {
            console.error('PostgreSQL pool error:', err);
        });
    }
    connect() {
        // pg Pool 是惰性连接，不需要显式连接
        // 但可以在这里进行连接测试
    }
    async disconnect() {
        // 先获取所有事务ID的快照
        const txnIds = Object.keys(this.txnDict);
        for (const txnId of txnIds) {
            try {
                await this.rollbackTransaction(txnId);
            }
            catch (e) {
                console.error(`Failed to rollback transaction ${txnId}:`, e);
            }
        }
        await this.pool.end();
    }
    async startTransaction(option) {
        const startInner = async () => {
            const connection = await this.pool.connect();
            // 添加：检测连接是否已被其他事务占用
            for (const txn2 in this.txnDict) {
                if (this.txnDict[txn2] === connection) {
                    return new Promise((resolve) => {
                        this.pool.on('release', () => resolve(startInner()));
                    });
                }
            }
            try {
                let beginStmt = 'BEGIN';
                if (option?.isolationLevel) {
                    // PostgreSQL 隔离级别: 
                    // READ UNCOMMITTED, READ COMMITTED, REPEATABLE READ, SERIALIZABLE
                    // 注意: PostgreSQL 的 READ UNCOMMITTED 行为等同于 READ COMMITTED
                    const level = this.mapIsolationLevel(option.isolationLevel);
                    beginStmt = `BEGIN ISOLATION LEVEL ${level}`;
                }
                await connection.query(beginStmt);
                const id = (0, uuid_1.v4)();
                this.txnDict[id] = connection;
                return id;
            }
            catch (error) {
                // 如果启动事务失败，释放连接
                connection.release();
                throw error;
            }
        };
        return startInner();
    }
    /**
     * 映射隔离级别到 PostgreSQL 语法
     */
    mapIsolationLevel(level) {
        const levelUpper = level.toUpperCase().replace(/[-_]/g, ' '); // 同时处理 - 和 _
        const validLevels = [
            'READ UNCOMMITTED',
            'READ COMMITTED',
            'REPEATABLE READ',
            'SERIALIZABLE'
        ];
        if (validLevels.includes(levelUpper)) {
            return levelUpper;
        }
        // 默认使用 READ COMMITTED
        console.warn(`Unknown isolation level "${level}", using READ COMMITTED`);
        return 'READ COMMITTED';
    }
    async exec(sql, txn) {
        if (process.env.NODE_ENV === 'development') {
            // console.log(`SQL: ${sql}; \n`);
        }
        try {
            let result;
            if (txn) {
                const connection = this.txnDict[txn];
                (0, assert_1.default)(connection, `Transaction ${txn} not found`);
                result = await connection.query(sql);
            }
            else {
                result = await this.pool.query(sql);
            }
            // 返回格式与 mysql2 兼容: [rows, fields/result]
            return [result.rows, result];
        }
        catch (error) {
            // 增强错误信息
            const enhancedError = new Error(`PostgreSQL query failed: ${error.message}\nSQL: ${sql.slice(0, 500)}${sql.length > 500 ? '...' : ''}`);
            enhancedError.originalError = error;
            enhancedError.sql = sql;
            throw enhancedError;
        }
    }
    async commitTransaction(txn) {
        const connection = this.txnDict[txn];
        (0, assert_1.default)(connection, `Transaction ${txn} not found`);
        try {
            await connection.query('COMMIT');
        }
        finally {
            delete this.txnDict[txn];
            connection.release();
        }
    }
    async rollbackTransaction(txn) {
        const connection = this.txnDict[txn];
        (0, assert_1.default)(connection, `Transaction ${txn} not found`);
        try {
            await connection.query('ROLLBACK');
        }
        finally {
            delete this.txnDict[txn];
            connection.release();
        }
    }
    /**
     * 获取连接池状态
     */
    getPoolStatus() {
        return {
            total: this.pool.totalCount,
            idle: this.pool.idleCount,
            waiting: this.pool.waitingCount
        };
    }
}
exports.PostgreSQLConnector = PostgreSQLConnector;