-- 数据库
CREATE DATABASE IF NOT EXISTS link_manager DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
USE link_manager;

-- 用户表
CREATE TABLE IF NOT EXISTS users (
    id INT(11) NOT NULL AUTO_INCREMENT,
    username VARCHAR(50) NOT NULL UNIQUE,
    email VARCHAR(100) NOT NULL UNIQUE,
    password VARCHAR(255) NOT NULL,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 主链接表
CREATE TABLE IF NOT EXISTS main_links (
    id INT(11) NOT NULL AUTO_INCREMENT,
    user_id INT(11) NOT NULL,
    slug VARCHAR(50) NOT NULL UNIQUE,
    name VARCHAR(100) NOT NULL,
    mode ENUM('sequence', 'count') NOT NULL DEFAULT 'sequence',
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 目标链接表
CREATE TABLE IF NOT EXISTS target_links (
    id INT(11) NOT NULL AUTO_INCREMENT,
    main_id INT(11) NOT NULL,
    url VARCHAR(255) NOT NULL,
    name VARCHAR(100) NOT NULL,
    count INT(11) NOT NULL DEFAULT 1,
    sort_order INT(11) NOT NULL DEFAULT 0,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    FOREIGN KEY (main_id) REFERENCES main_links(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 访问统计表
CREATE TABLE IF NOT EXISTS stats (
    id INT(11) NOT NULL AUTO_INCREMENT,
    target_id INT(11) NOT NULL,
    ip VARCHAR(45) NOT NULL,
    user_agent TEXT,
    created_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
    PRIMARY KEY (id),
    FOREIGN KEY (target_id) REFERENCES target_links(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

-- 当前位置表（用于顺序模式）
CREATE TABLE IF NOT EXISTS current_position (
    main_id INT(11) NOT NULL UNIQUE,
    target_id INT(11) NOT NULL,
    hit_count INT(11) NOT NULL DEFAULT 0,
    updated_at DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (main_id),
    FOREIGN KEY (main_id) REFERENCES main_links(id) ON DELETE CASCADE,
    FOREIGN KEY (target_id) REFERENCES target_links(id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;