-- 禁用外鍵檢查以避免在刪除表格時出現外鍵依賴問題
SET FOREIGN_KEY_CHECKS = 0;

-- ===========================
-- 1. 刪除外鍵約束（如果存在）
-- ===========================

-- 刪除 `clients` 表的外鍵約束
ALTER TABLE `clients` DROP FOREIGN KEY IF EXISTS `clients_llm_provider_id_foreign`;

-- 刪除 `auth_tokens` 表的外鍵約束
ALTER TABLE `auth_tokens` DROP FOREIGN KEY IF EXISTS `auth_tokens_client_id_foreign`;

-- 刪除 `admin_client` 表的外鍵約束
ALTER TABLE `admin_client` DROP FOREIGN KEY IF EXISTS `admin_client_admin_id_foreign`;
ALTER TABLE `admin_client` DROP FOREIGN KEY IF EXISTS `admin_client_client_id_foreign`;

-- ===========================
-- 2. 刪除表格（如果存在）
-- ===========================

-- 按照依賴順序刪除表格
DROP TABLE IF EXISTS `admin_client`;
DROP TABLE IF EXISTS `auth_tokens`;
DROP TABLE IF EXISTS `clients`;
DROP TABLE IF EXISTS `llm_providers`;
DROP TABLE IF EXISTS `admins`;
DROP TABLE IF EXISTS `operation_logs`;

-- ===========================
-- 3. 創建表格
-- ===========================

-- 創建 `admins` 表
CREATE TABLE `admins` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `username` VARCHAR(50) NOT NULL,
    `password` VARCHAR(255) NOT NULL,
    `email` VARCHAR(100) NULL DEFAULT NULL,
    `role` ENUM('super', 'admin') NOT NULL DEFAULT 'admin',
    `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`),
    UNIQUE KEY `admins_username_unique` (`username`),
    KEY `admins_email_index` (`email`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 創建 `llm_providers` 表
CREATE TABLE `llm_providers` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `name` VARCHAR(100) NOT NULL,
    `service_name` VARCHAR(100) NOT NULL,
    `api_url` VARCHAR(255) NOT NULL,
    `api_token` VARCHAR(255) NOT NULL,
    `status` ENUM('active', 'inactive') NOT NULL DEFAULT 'active',
    `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`),
    UNIQUE KEY `llm_providers_name_unique` (`name`),
    KEY `llm_providers_service_name_index` (`service_name`),
    KEY `llm_providers_status_index` (`status`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 創建 `clients` 表
CREATE TABLE `clients` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `name` VARCHAR(100) NOT NULL,
    `llm_provider_id` BIGINT UNSIGNED NOT NULL,
    `rate_limit` INT NOT NULL DEFAULT 60,
    `timeout` INT NOT NULL DEFAULT 30,
    `status` ENUM('active', 'inactive') NOT NULL DEFAULT 'active',
    `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`),
    KEY `clients_llm_provider_id_foreign` (`llm_provider_id`),
    KEY `clients_status_index` (`status`),
    CONSTRAINT `clients_llm_provider_id_foreign` FOREIGN KEY (`llm_provider_id`)
        REFERENCES `llm_providers` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 創建 `auth_tokens` 表
CREATE TABLE `auth_tokens` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `client_id` BIGINT UNSIGNED NOT NULL,
    `token` CHAR(64) NOT NULL,
    `expires_at` TIMESTAMP NULL DEFAULT NULL,
    `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`),
    UNIQUE KEY `auth_tokens_token_unique` (`token`),
    KEY `auth_tokens_client_id_index` (`client_id`),
    CONSTRAINT `auth_tokens_client_id_foreign` FOREIGN KEY (`client_id`)
        REFERENCES `clients` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 創建 `admin_client` 表（聯接表）
CREATE TABLE `admin_client` (
    `admin_id` BIGINT UNSIGNED NOT NULL,
    `client_id` BIGINT UNSIGNED NOT NULL,
    `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (`admin_id`, `client_id`),
    KEY `admin_client_client_id_foreign` (`client_id`),
    CONSTRAINT `admin_client_admin_id_foreign` FOREIGN KEY (`admin_id`)
        REFERENCES `admins` (`id`) ON DELETE CASCADE,
    CONSTRAINT `admin_client_client_id_foreign` FOREIGN KEY (`client_id`)
        REFERENCES `clients` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 創建 `operation_logs` 表
CREATE TABLE `operation_logs` (
    `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
    `user_type` ENUM('admin', 'client') NOT NULL,
    `user_id` BIGINT UNSIGNED NOT NULL,
    `operation` VARCHAR(255) NOT NULL,
    `ip_address` VARCHAR(45) NULL DEFAULT NULL,
    `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (`id`),
    KEY `operation_logs_user_type_user_id_index` (`user_type`, `user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- 啟用外鍵檢查
SET FOREIGN_KEY_CHECKS = 1;