-- ===========================================
-- 多班级版班级管理系统 - 数据库初始化脚本 (v2.2 Go重写版)
-- 数据库: classmanagerdb
-- 字符集: utf8mb4
-- MySQL 兼容: 5.7+（不使用 CHECK 约束、窗口函数等 8.0+ 特性）
-- 
-- 开发者: Canglan
-- 联系方式: admin@sea-studio.top
-- 版权归属: Sea Network Technology Studio
-- 许可证: Apache License 2.0
-- 
-- 版权所有 © Sea Network Technology Studio
-- ===========================================

CREATE DATABASE IF NOT EXISTS `classmanagerdb` 
CHARACTER SET utf8mb4 
COLLATE utf8mb4_unicode_ci;

USE `classmanagerdb`;

SET FOREIGN_KEY_CHECKS = 0;

-- ===========================================
-- 1. 班级表（多班级核心）
-- ===========================================
CREATE TABLE IF NOT EXISTS `classes` (
    `class_id` INT PRIMARY KEY AUTO_INCREMENT COMMENT '班级ID',
    `class_name` VARCHAR(100) NOT NULL COMMENT '班级名称，如 高一(1)班',
    `grade` VARCHAR(50) DEFAULT NULL COMMENT '年级',
    `description` VARCHAR(255) DEFAULT NULL COMMENT '班级描述',
    `status` TINYINT DEFAULT 1 COMMENT '状态：1=启用，0=禁用',
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY `uk_class_name` (`class_name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 2. 学期表（系统级共享）
-- ===========================================
CREATE TABLE IF NOT EXISTS `semesters` (
    `semester_id` INT PRIMARY KEY AUTO_INCREMENT,
    `semester_name` VARCHAR(100) NOT NULL COMMENT '学期名称，如 2025春季学期',
    `start_date` DATE DEFAULT NULL COMMENT '学期开始日期',
    `end_date` DATE DEFAULT NULL COMMENT '学期结束日期',
    `is_active` TINYINT DEFAULT 0 COMMENT '是否为当前活跃学期',
    `is_archived` TINYINT DEFAULT 0 COMMENT '是否已归档',
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 3. 科目表（系统级共享）
-- ===========================================
CREATE TABLE IF NOT EXISTS `subjects` (
    `subject_id` INT PRIMARY KEY AUTO_INCREMENT COMMENT '科目ID',
    `subject_name` VARCHAR(50) NOT NULL COMMENT '科目名称',
    `subject_code` VARCHAR(20) DEFAULT NULL COMMENT '科目代码',
    `is_active` TINYINT DEFAULT 1 COMMENT '是否启用',
    `sort_order` INT DEFAULT 0 COMMENT '排序序号',
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    UNIQUE KEY `uk_subject_name` (`subject_name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 4. 学生表（归属班级）
-- 宿舍号格式: 南0-000, 东12-345, 北1-001, 西5-222
-- 正则校验: ^[东南北西]\d{1,2}-\d{3}$（应用层校验，MySQL 5.7 不执行 CHECK 约束）
-- ===========================================
CREATE TABLE IF NOT EXISTS `students` (
    `student_id` INT PRIMARY KEY AUTO_INCREMENT,
    `student_no` VARCHAR(20) NOT NULL,
    `class_id` INT NOT NULL COMMENT '所属班级ID',
    `name` VARCHAR(50) NOT NULL,
    `total_points` INT DEFAULT 60,
    `parent_account` VARCHAR(50) DEFAULT NULL COMMENT '家长登录账号（推荐手机号）',
    `dormitory_number` VARCHAR(20) DEFAULT NULL COMMENT '宿舍号，格式：南0-000',
    `status` TINYINT DEFAULT 1,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    `points_updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '分数最后更新时间',
    `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    UNIQUE KEY `uk_student_no_class` (`student_no`, `class_id`),
    FOREIGN KEY (`class_id`) REFERENCES `classes`(`class_id`) ON DELETE RESTRICT
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 5. 用户表
-- ===========================================
CREATE TABLE IF NOT EXISTS `users` (
    `user_id` INT PRIMARY KEY AUTO_INCREMENT,
    `username` VARCHAR(50) NOT NULL UNIQUE,
    `password_hash` VARCHAR(60) NOT NULL COMMENT 'bcrypt 哈希（60字符）',
    `real_name` VARCHAR(50) NOT NULL,
    `user_type` ENUM('student', 'parent', 'admin', 'super_admin') NOT NULL,
    `student_id` INT DEFAULT NULL,
    `status` TINYINT DEFAULT 1,
    `need_change_password` TINYINT DEFAULT 1,
    `last_login_time` DATETIME DEFAULT NULL,
    `last_login_ip` VARCHAR(45) DEFAULT NULL,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`student_id`) REFERENCES `students`(`student_id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 6. 系统管理员表（独立于班级的超级管理员）
-- ===========================================
CREATE TABLE IF NOT EXISTS `super_admins` (
    `id` INT PRIMARY KEY AUTO_INCREMENT,
    `username` VARCHAR(50) NOT NULL UNIQUE COMMENT '登录用户名',
    `password_hash` VARCHAR(60) NOT NULL COMMENT 'bcrypt 哈希（60字符）',
    `real_name` VARCHAR(50) NOT NULL COMMENT '真实姓名',
    `status` TINYINT DEFAULT 1 COMMENT '状态：1=启用，0=禁用',
    `need_change_password` TINYINT DEFAULT 1 COMMENT '是否需要修改密码：1=需要，0=不需要',
    `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;

-- ===========================================
-- 7. 管理员角色表（归属班级）
-- ===========================================
CREATE TABLE IF NOT EXISTS `admin_roles` (
    `admin_role_id` INT PRIMARY KEY AUTO_INCREMENT,
    `user_id` INT NOT NULL,
    `class_id` INT NOT NULL COMMENT '所属班级ID',
    `role_type` ENUM('班主任', '班长', '学习委员', '考勤委员', '劳动委员', '志愿委员', '科任老师', '课代表') NOT NULL,
    `subject_id` INT DEFAULT NULL COMMENT '关联科目ID（科任老师/课代表必填）',
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`user_id`) REFERENCES `users`(`user_id`) ON DELETE CASCADE,
    FOREIGN KEY (`class_id`) REFERENCES `classes`(`class_id`) ON DELETE RESTRICT,
    FOREIGN KEY (`subject_id`) REFERENCES `subjects`(`subject_id`) ON DELETE CASCADE,
    UNIQUE KEY `uk_user_class` (`user_id`, `class_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 8. 操行分记录表
-- ===========================================
CREATE TABLE IF NOT EXISTS `conduct_records` (
    `record_id` BIGINT PRIMARY KEY AUTO_INCREMENT,
    `student_id` INT NOT NULL,
    `points_change` INT NOT NULL,
    `reason` VARCHAR(255) NOT NULL,
    `recorder_id` INT NOT NULL,
    `recorder_name` VARCHAR(50) DEFAULT NULL,
    `related_type` ENUM('manual', 'homework', 'attendance') DEFAULT 'manual',
    `related_id` INT DEFAULT NULL,
    `is_revoked` TINYINT DEFAULT 0,
    `revoked_by` INT DEFAULT NULL,
    `revoked_at` DATETIME DEFAULT NULL,
    `semester_id` INT DEFAULT NULL COMMENT '所属学期ID',
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`student_id`) REFERENCES `students`(`student_id`) ON DELETE CASCADE,
    FOREIGN KEY (`recorder_id`) REFERENCES `users`(`user_id`),
    FOREIGN KEY (`revoked_by`) REFERENCES `users`(`user_id`),
    FOREIGN KEY (`semester_id`) REFERENCES `semesters`(`semester_id`) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 9. 作业表（归属班级）
-- ===========================================
CREATE TABLE IF NOT EXISTS `assignments` (
    `assignment_id` INT PRIMARY KEY AUTO_INCREMENT,
    `class_id` INT NOT NULL COMMENT '所属班级ID',
    `subject_id` INT NOT NULL,
    `title` VARCHAR(100) NOT NULL,
    `description` TEXT,
    `deadline` DATE NOT NULL,
    `created_by` INT NOT NULL,
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`class_id`) REFERENCES `classes`(`class_id`) ON DELETE RESTRICT,
    FOREIGN KEY (`subject_id`) REFERENCES `subjects`(`subject_id`),
    FOREIGN KEY (`created_by`) REFERENCES `users`(`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 10. 作业提交记录表
-- ===========================================
CREATE TABLE IF NOT EXISTS `homework_submissions` (
    `submission_id` INT PRIMARY KEY AUTO_INCREMENT,
    `assignment_id` INT NOT NULL,
    `student_id` INT NOT NULL,
    `status` ENUM('submitted', 'not_submitted', 'late') DEFAULT 'not_submitted',
    `submit_time` DATETIME DEFAULT NULL,
    `comments` TEXT,
    `deduction_applied` TINYINT DEFAULT 0,
    `deduction_record_id` BIGINT DEFAULT NULL,
    `updated_by` INT DEFAULT NULL,
    `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (`assignment_id`) REFERENCES `assignments`(`assignment_id`) ON DELETE CASCADE,
    FOREIGN KEY (`student_id`) REFERENCES `students`(`student_id`) ON DELETE CASCADE,
    FOREIGN KEY (`deduction_record_id`) REFERENCES `conduct_records`(`record_id`) ON DELETE SET NULL,
    UNIQUE KEY `uk_assignment_student` (`assignment_id`, `student_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 11. 考勤记录表
-- ===========================================
CREATE TABLE IF NOT EXISTS `attendance_records` (
    `attendance_id` INT PRIMARY KEY AUTO_INCREMENT,
    `student_id` INT NOT NULL,
    `date` DATE NOT NULL,
    `slot` ENUM('morning', 'afternoon', 'evening') DEFAULT 'morning' COMMENT '考勤时段：早上/下午/晚修',
    `status` ENUM('present', 'absent', 'late', 'leave') DEFAULT 'present',
    `reason` VARCHAR(255) DEFAULT NULL,
    `recorder_id` INT NOT NULL,
    `deduction_applied` TINYINT DEFAULT 0,
    `deduction_record_id` BIGINT DEFAULT NULL,
    `semester_id` INT DEFAULT NULL COMMENT '所属学期ID',
    `created_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`student_id`) REFERENCES `students`(`student_id`) ON DELETE CASCADE,
    FOREIGN KEY (`recorder_id`) REFERENCES `users`(`user_id`),
    FOREIGN KEY (`deduction_record_id`) REFERENCES `conduct_records`(`record_id`) ON DELETE SET NULL,
    FOREIGN KEY (`semester_id`) REFERENCES `semesters`(`semester_id`) ON DELETE SET NULL,
    UNIQUE KEY `uk_student_date_slot` (`student_id`, `date`, `slot`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 12. 操作日志表
-- ===========================================
CREATE TABLE IF NOT EXISTS `operation_logs` (
    `log_id` BIGINT PRIMARY KEY AUTO_INCREMENT,
    `operator_id` INT NOT NULL,
    `operator_name` VARCHAR(50) DEFAULT NULL,
    `operator_role` VARCHAR(50) DEFAULT NULL,
    `class_id` INT DEFAULT NULL COMMENT '操作所属班级ID',
    `operation_type` VARCHAR(50) NOT NULL,
    `target_type` VARCHAR(50) DEFAULT NULL,
    `target_id` INT DEFAULT NULL,
    `details` TEXT,
    `ip_address` VARCHAR(45) DEFAULT NULL,
    `created_at` DATETIME DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 13. 登录日志表
-- ===========================================
CREATE TABLE IF NOT EXISTS `login_logs` (
    `log_id` BIGINT PRIMARY KEY AUTO_INCREMENT,
    `username` VARCHAR(50) NOT NULL,
    `login_result` TINYINT NOT NULL,
    `fail_reason` VARCHAR(100) DEFAULT NULL,
    `ip_address` VARCHAR(45) DEFAULT NULL,
    `user_agent` VARCHAR(255) DEFAULT NULL,
    `created_at` DATETIME DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 14. 学期归档快照表
-- ===========================================
CREATE TABLE IF NOT EXISTS `semester_archives` (
    `archive_id` INT PRIMARY KEY AUTO_INCREMENT,
    `semester_id` INT NOT NULL,
    `class_id` INT NOT NULL COMMENT '所属班级ID',
    `student_id` INT NOT NULL,
    `student_no` VARCHAR(20) NOT NULL,
    `student_name` VARCHAR(50) NOT NULL,
    `final_points` INT NOT NULL COMMENT '学期最终操行分',
    `rank_position` INT DEFAULT NULL COMMENT '班级内排名',
    `total_students` INT DEFAULT NULL COMMENT '班级总人数',
    `attendance_present` INT DEFAULT 0 COMMENT '出勤次数',
    `attendance_absent` INT DEFAULT 0 COMMENT '缺勤次数',
    `attendance_late` INT DEFAULT 0 COMMENT '迟到次数',
    `attendance_leave` INT DEFAULT 0 COMMENT '请假次数',
    `homework_submitted` INT DEFAULT 0 COMMENT '已交作业数',
    `homework_not_submitted` INT DEFAULT 0 COMMENT '未交作业数',
    `homework_late` INT DEFAULT 0 COMMENT '迟交作业数',
    `archived_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (`semester_id`) REFERENCES `semesters`(`semester_id`),
    FOREIGN KEY (`class_id`) REFERENCES `classes`(`class_id`) ON DELETE RESTRICT,
    FOREIGN KEY (`student_id`) REFERENCES `students`(`student_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 15. 系统设置表（全局）
-- ===========================================
CREATE TABLE IF NOT EXISTS `system_settings` (
    `setting_key` VARCHAR(50) PRIMARY KEY,
    `setting_value` VARCHAR(255) NOT NULL,
    `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 16. 班级设置表（每班级独立配置，班主任可修改）
-- setting_key 约定：
--   角色加减分上下限:
--     point_limit_班主任_max / point_limit_班主任_min
--     point_limit_班长_max / point_limit_班长_min              （默认 ±5）
--     point_limit_学习委员_max / point_limit_学习委员_min        （默认 ±5）
--     point_limit_考勤委员_max / point_limit_考勤委员_min
--     point_limit_劳动委员_max / point_limit_劳动委员_min        （默认 ±1）
--     point_limit_志愿委员_max / point_limit_志愿委员_min        （默认 0~5）
--     point_limit_科任老师_max / point_limit_科任老师_min        （默认 ±5）
--   操行分初始值:
--     initial_points                                              （默认 60）
--   扣分规则:
--     deduction_homework_not_submit                               （默认 2）
--     deduction_homework_late                                     （默认 1）
--     deduction_attendance_absent                                 （默认 3）
--     deduction_attendance_late                                   （默认 1）
--     deduction_attendance_leave                                  （默认 0）
--   家长相关:
--     parent_password_change_enabled                              （默认 true）
--     parent_account_enabled                                      （默认 true）
--   周期重置:
--     reset_frequency                                             （默认 none: 仅学期结算; weekly: 每周; monthly: 每月）
--     reset_day_of_week                                           （默认 1: 周重置日 1=周一 ~ 7=周日，仅 weekly 时生效）
--     reset_day_of_month                                          （默认 1: 月重置日 1~28，仅 monthly 时生效）
-- ===========================================
CREATE TABLE IF NOT EXISTS `class_settings` (
    `setting_id` INT PRIMARY KEY AUTO_INCREMENT,
    `class_id` INT NOT NULL COMMENT '所属班级ID',
    `setting_key` VARCHAR(50) NOT NULL COMMENT '设置项键名',
    `setting_value` VARCHAR(255) NOT NULL COMMENT '设置项值',
    `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (`class_id`) REFERENCES `classes`(`class_id`) ON DELETE CASCADE,
    UNIQUE KEY `uk_class_setting` (`class_id`, `setting_key`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 17. 周期归档快照表（周/月重置时创建）
-- ===========================================
CREATE TABLE IF NOT EXISTS `period_archives` (
    `archive_id` INT PRIMARY KEY AUTO_INCREMENT,
    `class_id` INT NOT NULL COMMENT '所属班级ID',
    `period_type` ENUM('weekly', 'monthly') NOT NULL COMMENT '周期类型：weekly=周，monthly=月',
    `period_label` VARCHAR(50) NOT NULL COMMENT '周期标签，如 2025-W03、2025-01',
    `student_id` INT NOT NULL,
    `student_no` VARCHAR(20) NOT NULL,
    `student_name` VARCHAR(50) NOT NULL,
    `final_points` INT NOT NULL COMMENT '重置前操行分',
    `rank_position` INT DEFAULT NULL COMMENT '班级内排名',
    `total_students` INT DEFAULT NULL COMMENT '班级总人数',
    `archived_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    `reset_by` VARCHAR(20) DEFAULT 'auto' COMMENT '重置触发方式：auto=自动定时，manual=手动触发',
    `operator_id` INT DEFAULT NULL COMMENT '手动触发的操作者ID',
    FOREIGN KEY (`class_id`) REFERENCES `classes`(`class_id`) ON DELETE RESTRICT,
    FOREIGN KEY (`student_id`) REFERENCES `students`(`student_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 18. 班级功能开关表（控制班级内各功能模块的启用/禁用）
-- feature_key 约定：
--   role_班长_enabled / role_学习委员_enabled / role_考勤委员_enabled
--   role_劳动委员_enabled / role_志愿委员_enabled
--   role_科任老师_enabled / role_课代表_enabled
-- ===========================================
CREATE TABLE IF NOT EXISTS `class_features` (
    `feature_id` INT PRIMARY KEY AUTO_INCREMENT,
    `class_id` INT NOT NULL COMMENT '所属班级ID',
    `feature_key` VARCHAR(50) NOT NULL COMMENT '功能标识',
    `enabled` TINYINT DEFAULT 1 COMMENT '是否启用：1=启用，0=禁用',
    `updated_at` TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (`class_id`) REFERENCES `classes`(`class_id`) ON DELETE CASCADE,
    UNIQUE KEY `uk_class_feature` (`class_id`, `feature_key`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ===========================================
-- 性能索引（使用存储过程实现 MySQL 5.7 兼容的条件索引创建）
-- ===========================================
DROP PROCEDURE IF EXISTS `create_index_if_not_exists`;
DELIMITER //
CREATE PROCEDURE `create_index_if_not_exists`(
    IN `p_table` VARCHAR(64),
    IN `p_index` VARCHAR(64),
    IN `p_columns` VARCHAR(255)
)
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM `information_schema`.`statistics`
        WHERE `table_schema` = DATABASE()
          AND `table_name` = p_table
          AND `index_name` = p_index
        LIMIT 1
    ) THEN
        SET @sql = CONCAT('CREATE INDEX `', p_index, '` ON `', p_table, '`(', p_columns, ')');
        PREPARE stmt FROM @sql;
        EXECUTE stmt;
        DEALLOCATE PREPARE stmt;
    END IF;
END //
DELIMITER ;

CALL `create_index_if_not_exists`('conduct_records',    'idx_conduct_semester',      '`semester_id`');
CALL `create_index_if_not_exists`('attendance_records',  'idx_attendance_semester',   '`semester_id`');
CALL `create_index_if_not_exists`('conduct_records',    'idx_conduct_student',       '`student_id`');
CALL `create_index_if_not_exists`('conduct_records',    'idx_student_created',       '`student_id`, `created_at`');
CALL `create_index_if_not_exists`('conduct_records',    'idx_recorder_id',           '`recorder_id`');
CALL `create_index_if_not_exists`('conduct_records',    'idx_conduct_type_semester', '`semester_id`, `related_type`, `student_id`');
CALL `create_index_if_not_exists`('attendance_records',  'idx_attendance_date',       '`date`');
CALL `create_index_if_not_exists`('login_logs',         'idx_username_created',      '`username`, `created_at`');
CALL `create_index_if_not_exists`('operation_logs',     'idx_operator_created',      '`operator_id`, `created_at`');
CALL `create_index_if_not_exists`('semester_archives',  'idx_semester_id',           '`semester_id`');
CALL `create_index_if_not_exists`('students',           'idx_student_class',         '`class_id`');
CALL `create_index_if_not_exists`('admin_roles',        'idx_admin_role_class',      '`class_id`');
CALL `create_index_if_not_exists`('assignments',        'idx_assignment_class',      '`class_id`');
CALL `create_index_if_not_exists`('assignments',        'idx_assignment_subject',    '`subject_id`');
CALL `create_index_if_not_exists`('semester_archives',  'idx_archive_class',         '`class_id`');
CALL `create_index_if_not_exists`('operation_logs',     'idx_operation_class',       '`class_id`');
CALL `create_index_if_not_exists`('period_archives',    'idx_period_archive_type',   '`class_id`, `period_type`, `period_label`');

DROP PROCEDURE IF EXISTS `create_index_if_not_exists`;

SET FOREIGN_KEY_CHECKS = 1;

-- ===========================================
-- 初始数据
-- ===========================================

-- 插入初始科目（仅语数英，如不存在）
INSERT IGNORE INTO `subjects` (`subject_name`, `subject_code`, `sort_order`) VALUES
('语文', 'CHI', 1),
('数学', 'MATH', 2),
('英语', 'ENG', 3);

-- 初始化系统版本号
INSERT INTO `system_settings` (`setting_key`, `setting_value`)
VALUES ('db_version', '2.2')
ON DUPLICATE KEY UPDATE `setting_value` = '2.2';

-- 系统管理员独立登录路径
INSERT INTO `system_settings` (`setting_key`, `setting_value`)
VALUES ('super_admin_login_path', '/super-admin/login')
ON DUPLICATE KEY UPDATE `setting_value` = '/super-admin/login';

-- 控制台输出初始化结果（含版本号）
SELECT CONCAT('数据库初始化完成！版本: v', (SELECT setting_value FROM system_settings WHERE setting_key = 'db_version')) AS message;