-- 创建数据库
CREATE DATABASE IF NOT EXISTS absence_manager DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

USE absence_manager;

-- 创建学生表
CREATE TABLE IF NOT EXISTS students (
    id INT PRIMARY KEY AUTO_INCREMENT,
    student_id VARCHAR(20) UNIQUE NOT NULL,  -- 学号
    name VARCHAR(50) NOT NULL,               -- 姓名
    class_name VARCHAR(50) NOT NULL,         -- 班级
    contact VARCHAR(20),                     -- 联系方式
    college VARCHAR(50) NOT NULL,            -- 学院
    major VARCHAR(50) NOT NULL,              -- 专业
    is_graduating BOOLEAN DEFAULT FALSE,     -- 是否毕业班
    password VARCHAR(50) NOT NULL,           -- 密码
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='学生信息表';

-- 创建教师表
CREATE TABLE IF NOT EXISTS teachers (
    id INT PRIMARY KEY AUTO_INCREMENT,
    teacher_id VARCHAR(20) UNIQUE NOT NULL,  -- 工号
    name VARCHAR(50) NOT NULL,               -- 姓名
    department VARCHAR(50) NOT NULL,         -- 部门
    contact VARCHAR(20),                     -- 联系方式
    password VARCHAR(50) NOT NULL,           -- 密码
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='教师信息表';

-- 创建请假申请表
CREATE TABLE IF NOT EXISTS leave_requests (
    id INT PRIMARY KEY AUTO_INCREMENT,
    student_id INT NOT NULL,                 -- 关联学生ID
    start_time DATETIME NOT NULL,            -- 开始时间
    end_time DATETIME NOT NULL,              -- 结束时间
    duration DECIMAL(5,2) NOT NULL,          -- 时长
    location VARCHAR(100) NOT NULL,          -- 外出地址
    reason_type VARCHAR(50) NOT NULL,        -- 外出事由类型
    reason_detail TEXT,                      -- 详细事由
    is_leaving_city BOOLEAN DEFAULT FALSE,   -- 是否离津
    special_situation TEXT,                  -- 其他特殊情况
    status VARCHAR(20) NOT NULL DEFAULT 'PENDING',  -- 审批状态
    approver_id INT,                         -- 审批人ID
    approval_comment TEXT,                   -- 审批意见
    request_time TIMESTAMP DEFAULT CURRENT_TIMESTAMP,  -- 申请时间
    approval_time TIMESTAMP NULL,            -- 审批时间
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (student_id) REFERENCES students(id),
    FOREIGN KEY (approver_id) REFERENCES teachers(id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='请假申请表';

-- 插入示例数据
INSERT INTO students (student_id, name, class_name, contact, college, major, is_graduating, password) VALUES
('2023208145', '李同学', '云计算G23-1', '15842087237', '信息工程学院', '云计算技术应用', false, '123456'),
('2023208146', '张同学', '云计算G23-1', '15842087238', '信息工程学院', '云计算技术应用', false, '123456');

INSERT INTO teachers (teacher_id, name, department, contact, password) VALUES
('2023001', '王老师', '信息工程学院', '13912345678', '123456'),
('2023002', '李老师', '信息工程学院', '13912345679', '123456');

-- 插入请假申请示例数据
INSERT INTO leave_requests (student_id, start_time, end_time, duration, location, reason_type, reason_detail, is_leaving_city, status, approver_id, approval_comment, request_time) VALUES
(1, '2024-01-15 08:00:00', '2024-01-15 17:00:00', 9.00, '天津市河西区图书馆', '学习', '去图书馆学习准备考试', false, 'APPROVED', 1, '同意', '2024-01-14 10:00:00'),
(2, '2024-01-16 13:00:00', '2024-01-16 17:30:00', 4.50, '天津市南开医院', '就医', '牙科复诊', false, 'APPROVED', 1, '注意安全', '2024-01-15 09:30:00'),
(1, '2024-01-17 09:00:00', '2024-01-17 12:00:00', 3.00, '天津市档案馆', '办事', '办理个人档案', false, 'PENDING', null, null, '2024-01-16 16:20:00'),
(2, '2024-01-18 14:00:00', '2024-01-18 18:00:00', 4.00, '和平区文化中心', '活动', '参加志愿者活动', false, 'REJECTED', 2, '活动时间与课程冲突', '2024-01-17 11:15:00'),
(1, '2024-01-19 10:00:00', '2024-01-19 16:00:00', 6.00, '天津站', '返乡', '购买返乡车票', true, 'APPROVED', 2, '请注意防疫', '2024-01-18 14:40:00'),
(2, '2024-01-20 09:30:00', '2024-01-20 11:30:00', 2.00, '河西区人才市场', '求职', '参加招聘会', false, 'PENDING', null, null, '2024-01-19 17:00:00'),
(1, '2024-01-21 13:00:00', '2024-01-21 17:00:00', 4.00, '天津市第一中心医院', '就医', '例行体检', false, 'APPROVED', 1, '准假', '2024-01-20 10:25:00'),
(2, '2024-01-22 08:00:00', '2024-01-22 18:00:00', 10.00, '滨海新区图书馆', '实习', '企业实地考察', false, 'PENDING', null, null, '2024-01-21 15:30:00'),
(1, '2024-01-23 14:00:00', '2024-01-23 16:00:00', 2.00, '南开区政务中心', '办事', '办理身份证', false, 'APPROVED', 2, '同意', '2024-01-22 09:45:00'),
(2, '2024-01-24 09:00:00', '2024-01-24 18:00:00', 9.00, '天津市人民医院', '就医', '陪同父亲做检查', false, 'PENDING', null, null, '2024-01-23 16:50:00');