<?php

declare(strict_types=1);

/**
 * Initiales Schema.
 * Zeitstempel werden bewusst als UTC-Strings (Y-m-d H:i:s) gespeichert,
 * damit SQLite und MySQL identisch behandelt werden koennen.
 */
return [
    'sqlite' => [
        'CREATE TABLE IF NOT EXISTS links (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            slug TEXT NOT NULL UNIQUE,
            target_url TEXT NOT NULL,
            title TEXT NULL,
            is_active INTEGER NOT NULL DEFAULT 1,
            click_count INTEGER NOT NULL DEFAULT 0,
            last_clicked_at TEXT NULL,
            created_at TEXT NOT NULL,
            updated_at TEXT NOT NULL
        )',
        'CREATE INDEX IF NOT EXISTS idx_links_created_at ON links (created_at)',

        'CREATE TABLE IF NOT EXISTS visits (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            link_id INTEGER NOT NULL,
            visited_at TEXT NOT NULL,
            referrer_host TEXT NULL,
            referrer_url TEXT NULL,
            user_agent TEXT NULL,
            device_type TEXT NOT NULL DEFAULT "unknown",
            browser TEXT NOT NULL DEFAULT "unknown",
            platform TEXT NOT NULL DEFAULT "unknown",
            visitor_hash TEXT NULL,
            FOREIGN KEY (link_id) REFERENCES links (id) ON DELETE CASCADE
        )',
        'CREATE INDEX IF NOT EXISTS idx_visits_link_time ON visits (link_id, visited_at)',

        'CREATE TABLE IF NOT EXISTS qr_designs (
            link_id INTEGER PRIMARY KEY,
            foreground_color TEXT NOT NULL DEFAULT "#000000",
            background_color TEXT NOT NULL DEFAULT "#ffffff",
            size INTEGER NOT NULL DEFAULT 512,
            margin INTEGER NOT NULL DEFAULT 4,
            error_correction TEXT NOT NULL DEFAULT "M",
            logo_path TEXT NULL,
            logo_scale INTEGER NOT NULL DEFAULT 22,
            logo_punchout INTEGER NOT NULL DEFAULT 1,
            updated_at TEXT NOT NULL,
            FOREIGN KEY (link_id) REFERENCES links (id) ON DELETE CASCADE
        )',

        'CREATE TABLE IF NOT EXISTS settings (
            key_name TEXT PRIMARY KEY,
            value TEXT NULL,
            updated_at TEXT NOT NULL
        )',

        'CREATE TABLE IF NOT EXISTS login_attempts (
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            identifier TEXT NOT NULL,
            attempted_at TEXT NOT NULL,
            successful INTEGER NOT NULL DEFAULT 0
        )',
        'CREATE INDEX IF NOT EXISTS idx_login_attempts ON login_attempts (identifier, attempted_at)',
    ],

    'mysql' => [
        'CREATE TABLE IF NOT EXISTS links (
            id INT AUTO_INCREMENT PRIMARY KEY,
            slug VARCHAR(190) NOT NULL,
            target_url TEXT NOT NULL,
            title VARCHAR(255) NULL,
            is_active TINYINT(1) NOT NULL DEFAULT 1,
            click_count INT NOT NULL DEFAULT 0,
            last_clicked_at DATETIME NULL,
            created_at DATETIME NOT NULL,
            updated_at DATETIME NOT NULL,
            UNIQUE KEY uniq_links_slug (slug),
            KEY idx_links_created_at (created_at)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4',

        'CREATE TABLE IF NOT EXISTS visits (
            id BIGINT AUTO_INCREMENT PRIMARY KEY,
            link_id INT NOT NULL,
            visited_at DATETIME NOT NULL,
            referrer_host VARCHAR(255) NULL,
            referrer_url TEXT NULL,
            user_agent TEXT NULL,
            device_type VARCHAR(20) NOT NULL DEFAULT "unknown",
            browser VARCHAR(40) NOT NULL DEFAULT "unknown",
            platform VARCHAR(40) NOT NULL DEFAULT "unknown",
            visitor_hash VARCHAR(64) NULL,
            KEY idx_visits_link_time (link_id, visited_at),
            CONSTRAINT fk_visits_link FOREIGN KEY (link_id) REFERENCES links (id) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4',

        'CREATE TABLE IF NOT EXISTS qr_designs (
            link_id INT PRIMARY KEY,
            foreground_color VARCHAR(7) NOT NULL DEFAULT "#000000",
            background_color VARCHAR(7) NOT NULL DEFAULT "#ffffff",
            size INT NOT NULL DEFAULT 512,
            margin INT NOT NULL DEFAULT 4,
            error_correction VARCHAR(1) NOT NULL DEFAULT "M",
            logo_path VARCHAR(255) NULL,
            logo_scale INT NOT NULL DEFAULT 22,
            logo_punchout TINYINT(1) NOT NULL DEFAULT 1,
            updated_at DATETIME NOT NULL,
            CONSTRAINT fk_qr_link FOREIGN KEY (link_id) REFERENCES links (id) ON DELETE CASCADE
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4',

        'CREATE TABLE IF NOT EXISTS settings (
            key_name VARCHAR(190) PRIMARY KEY,
            value TEXT NULL,
            updated_at DATETIME NOT NULL
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4',

        'CREATE TABLE IF NOT EXISTS login_attempts (
            id BIGINT AUTO_INCREMENT PRIMARY KEY,
            identifier VARCHAR(64) NOT NULL,
            attempted_at DATETIME NOT NULL,
            successful TINYINT(1) NOT NULL DEFAULT 0,
            KEY idx_login_attempts (identifier, attempted_at)
        ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4',
    ],
];