using System;
using Dapper;
using MySqlConnector;

namespace CncWebApi.Tests
{
    /// <summary>
    /// WebApi层测试数据库辅助类
    /// 与Service.Tests共享同一个cnc_test库
    /// </summary>
    public static class TestDb
    {
        /// <summary>测试库连接串</summary>
        public static readonly string ConnectionString =
            "Server=localhost;Database=cnc_test;Uid=root;Pwd=root;Charset=utf8mb4;SslMode=None;";

        /// <summary>清空所有测试表并重置种子数据</summary>
        public static void TruncateAll()
        {
            using (var conn = new MySqlConnection(ConnectionString))
            {
                var tables = new[]
                {
                    "log_collect_raw",
                    "log_collector_heartbeat",
                    "cnc_worker_machine",
                    "cnc_production_segment",
                    "cnc_machine_daily_status",
                    "cnc_worker_daily_summary",
                    "cnc_daily_production",
                    "cnc_production_adjustment",
                    "cnc_alert",
                    "log_system",
                    "cnc_machine",
                    "cnc_collect_address",
                    "cnc_brand_field_mapping",
                    "cnc_screen_filter",
                    "cnc_screen_config",
                    "cnc_worker",
                    "cnc_sys_config",
                    "cnc_workshop",
                    "cnc_brand"
                };

                conn.Execute("SET FOREIGN_KEY_CHECKS = 0");
                foreach (var table in tables)
                {
                    conn.Execute($"DELETE FROM {table}");
                    conn.Execute($"ALTER TABLE {table} AUTO_INCREMENT = 1");
                }
                conn.Execute("SET FOREIGN_KEY_CHECKS = 1");
            }

            SeedData();
        }

        /// <summary>插入基础种子数据</summary>
        public static void SeedData()
        {
            using (var conn = new MySqlConnection(ConnectionString))
            {
                conn.Execute(@"INSERT IGNORE INTO cnc_brand (id, brand_name, device_field, tags_path, is_enabled, created_at, updated_at)
                    VALUES (1, 'FANUC', 'device', 'tags', 1, NOW(), NOW())");
                conn.Execute(@"INSERT IGNORE INTO cnc_workshop (id, name, sort_order, is_enabled, created_at, updated_at)
                    VALUES (1, 'A栋', 1, 1, NOW(), NOW()), (2, 'B栋', 2, 1, NOW(), NOW())");
                conn.Execute(@"INSERT IGNORE INTO cnc_sys_config (config_key, config_value, value_type, description, updated_at)
                    VALUES ('admin_username', 'admin', 'string', '管理员用户名', NOW()),
                           ('admin_password_hash', '$2a$11$dummyhashfortesting', 'string', '管理员密码哈希', NOW())");
            }
        }

        /// <summary>设置真实BCrypt密码哈希</summary>
        public static void SetRealPasswordHash(string plainPassword)
        {
            var hash = BCrypt.Net.BCrypt.HashPassword(plainPassword);
            using (var conn = new MySqlConnection(ConnectionString))
            {
                conn.Execute("UPDATE cnc_sys_config SET config_value = @hash WHERE config_key = 'admin_password_hash'", new { hash });
            }
        }

        /// <summary>执行SQL</summary>
        public static int Execute(string sql, object param = null)
        {
            using (var conn = new MySqlConnection(ConnectionString))
            {
                return conn.Execute(sql, param);
            }
        }

        /// <summary>查询单个值</summary>
        public static T QuerySingle<T>(string sql, object param = null)
        {
            using (var conn = new MySqlConnection(ConnectionString))
            {
                return conn.QuerySingle<T>(sql, param);
            }
        }

        /// <summary>查询可空单个值</summary>
        public static T QueryFirstOrDefault<T>(string sql, object param = null)
        {
            using (var conn = new MySqlConnection(ConnectionString))
            {
                return conn.QueryFirstOrDefault<T>(sql, param);
            }
        }

        /// <summary>生成有效JWT Token（用于需要认证的Controller测试）</summary>
        public static string GenerateTestToken(string jwtSecret = "test-jwt-secret-key-for-unit-testing-2024")
        {
            const string headerJson = "{\"alg\":\"HS256\",\"typ\":\"JWT\"}";
            long exp = DateTimeOffset.UtcNow.AddHours(8).ToUnixTimeSeconds();
            string payloadJson = $"{{\"sub\":\"admin\",\"name\":\"admin\",\"exp\":{exp}}}";
            string header = Base64UrlEncode(System.Text.Encoding.UTF8.GetBytes(headerJson));
            string payload = Base64UrlEncode(System.Text.Encoding.UTF8.GetBytes(payloadJson));
            string unsigned = header + "." + payload;
            using (var hmac = new System.Security.Cryptography.HMACSHA256(System.Text.Encoding.UTF8.GetBytes(jwtSecret)))
            {
                var sig = hmac.ComputeHash(System.Text.Encoding.UTF8.GetBytes(unsigned));
                string signature = Base64UrlEncode(sig);
                return unsigned + "." + signature;
            }
        }

        private static string Base64UrlEncode(byte[] input)
        {
            return Convert.ToBase64String(input).Replace("+", "-").Replace("/", "_").TrimEnd('=');
        }
    }
}