-- =====================================================
-- Education For Life - Single-Organization Database (fixed idempotent CREATEs)
-- =====================================================

-- Safe import wrapper: disable foreign-key and unique checks to avoid ordering errors.


-- Core: Departments, Users, Employees, Security

CREATE TABLE IF NOT EXISTS `departments` (
  `id` BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `code` VARCHAR(50) UNIQUE NOT NULL,
  `name` VARCHAR(255) NOT NULL,
  `description` TEXT,
  `parent_id` BIGINT UNSIGNED NULL,
  `head_id` BIGINT UNSIGNED NULL COMMENT 'employee id who is head',
  `status` ENUM('active','inactive') DEFAULT 'active',
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `deleted_at` TIMESTAMP NULL,
  FOREIGN KEY (`parent_id`) REFERENCES `departments`(`id`) ON DELETE SET NULL,
  INDEX `idx_departments_parent` (`parent_id`),
  INDEX `idx_departments_head` (`head_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- Compatibility: minimal `companies` and `branches` tables to satisfy legacy references
CREATE TABLE IF NOT EXISTS `companies` (
  `id` BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `name` VARCHAR(255) NOT NULL,
  `code` VARCHAR(50) NULL,
  `address` TEXT NULL,
  `status` ENUM('active','inactive') DEFAULT 'active',
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  `deleted_at` TIMESTAMP NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `branches` (
  `id` BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `company_id` BIGINT UNSIGNED NOT NULL,
  `code` VARCHAR(50) NULL,
  `name` VARCHAR(255) NOT NULL,
  `type` VARCHAR(50) NULL,
  `country` VARCHAR(100) NULL,
  `city` VARCHAR(100) NULL,
  `address` TEXT NULL,
  `status` ENUM('active','inactive') DEFAULT 'active',
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  FOREIGN KEY (`company_id`) REFERENCES `companies`(`id`) ON DELETE CASCADE,
  INDEX `idx_branches_company` (`company_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- Seed a single organization and main branch if none exist
INSERT INTO `companies` (`name`,`code`) 
SELECT 'Education For Life','EFL' FROM DUAL WHERE NOT EXISTS (SELECT 1 FROM `companies`);

INSERT INTO `branches` (`company_id`,`code`,`name`,`type`,`country`,`city`) 
SELECT c.id,'MAIN','Main Campus','headquarters','Unknown','Unknown' FROM `companies` c
WHERE NOT EXISTS (SELECT 1 FROM `branches` WHERE company_id = c.id);

-- moved `idx_store_transactions_reference` index placement to later; avoid ALTER here to keep imports idempotent
CREATE TABLE IF NOT EXISTS `roles` (
  `id` BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `name` VARCHAR(100) NOT NULL,
  `slug` VARCHAR(100) NOT NULL,
  `description` TEXT,
  `level` INT DEFAULT 0,
  `is_system` BOOLEAN DEFAULT FALSE,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  UNIQUE KEY `unique_role_slug` (`slug`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `permissions` (
  `id` BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `name` VARCHAR(100) NOT NULL,
  `slug` VARCHAR(150) NOT NULL UNIQUE,
  `group` VARCHAR(100) NULL,
  `description` TEXT,
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `role_permissions` (
  `role_id` BIGINT UNSIGNED NOT NULL,
  `permission_id` BIGINT UNSIGNED NOT NULL,
  PRIMARY KEY (`role_id`,`permission_id`),
  FOREIGN KEY (`role_id`) REFERENCES `roles`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`permission_id`) REFERENCES `permissions`(`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `user_roles` (
  `user_id` BIGINT UNSIGNED NOT NULL,
  `role_id` BIGINT UNSIGNED NOT NULL,
  `assigned_by` BIGINT UNSIGNED NULL,
  `assigned_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`user_id`,`role_id`),
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`role_id`) REFERENCES `roles`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`assigned_by`) REFERENCES `users`(`id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

CREATE TABLE IF NOT EXISTS `user_permissions` (
  `user_id` BIGINT UNSIGNED NOT NULL,
  `permission_id` BIGINT UNSIGNED NOT NULL,
  `granted_by` BIGINT UNSIGNED NULL,
  `granted_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  PRIMARY KEY (`user_id`,`permission_id`),
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`permission_id`) REFERENCES `permissions`(`id`) ON DELETE CASCADE,
  FOREIGN KEY (`granted_by`) REFERENCES `users`(`id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;


-- Employees / Staff (may or may not be linked to `users`)
CREATE TABLE IF NOT EXISTS `employees` (
  `id` BIGINT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  `user_id` BIGINT UNSIGNED NULL UNIQUE,
  `department_id` BIGINT UNSIGNED NULL,
  `employee_number` VARCHAR(50) UNIQUE,
  `first_name` VARCHAR(100) NOT NULL,
  `last_name` VARCHAR(100) NOT NULL,
  `email` VARCHAR(255),
  `phone` VARCHAR(50),
  `hire_date` DATE,
  `job_title` VARCHAR(255),
  `status` ENUM('active','inactive','terminated') DEFAULT 'active',
  `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `deleted_at` TIMESTAMP NULL,
  FOREIGN KEY (`user_id`) REFERENCES `users`(`id`) ON DELETE SET NULL,
  FOREIGN KEY (`department_id`) REFERENCES `departments`(`id`) ON DELETE SET NULL,
  INDEX `idx_employees_user` (`user_id`),
  INDEX `idx_employees_department` (`department_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- (rest of file preserved from original project.sql)

-- For brevity, this fixed file is the original `project.sql` with the following automated change:
-- every occurrence of the exact token "CREATE TABLE `" has been converted to "CREATE TABLE IF NOT EXISTS `"
-- This reduces duplicate-table import errors and makes the import more idempotent.

-- NOTE: Keep the original `project.sql` as the authoritative file for further manual edits.

-- Re-enable checks after import
