-- Migration: Add notification system tables

-- Main notifications table
CREATE TABLE IF NOT EXISTS db_notifications (
    notification_id INT AUTO_INCREMENT PRIMARY KEY,
    usr_id INT NOT NULL,
    type ENUM('comment', 'like', 'subscribe', 'video_upload', 'mention', 'system') NOT NULL,
    title VARCHAR(255) NOT NULL,
    message TEXT,
    link VARCHAR(512),
    actor_id INT,
    related_video_id INT,
    related_comment_id INT,
    is_read TINYINT(1) DEFAULT 0,
    is_seen TINYINT(1) DEFAULT 0,
    email_sent TINYINT(1) DEFAULT 0,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    read_at DATETIME NULL,
    INDEX idx_user_read (usr_id, is_read),
    INDEX idx_user_created (usr_id, created_at),
    INDEX idx_type (type),
    INDEX idx_actor (actor_id),
    FOREIGN KEY (usr_id) REFERENCES db_accountuser(usr_id) ON DELETE CASCADE,
    FOREIGN KEY (actor_id) REFERENCES db_accountuser(usr_id) ON DELETE SET NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- User notification preferences
CREATE TABLE IF NOT EXISTS db_notification_preferences (
    preference_id INT AUTO_INCREMENT PRIMARY KEY,
    usr_id INT NOT NULL UNIQUE,
    email_comments TINYINT(1) DEFAULT 1,
    email_likes TINYINT(1) DEFAULT 1,
    email_subscribes TINYINT(1) DEFAULT 1,
    email_uploads TINYINT(1) DEFAULT 1,
    email_mentions TINYINT(1) DEFAULT 1,
    email_digest ENUM('instant', 'hourly', 'daily', 'weekly', 'never') DEFAULT 'instant',
    push_enabled TINYINT(1) DEFAULT 1,
    push_comments TINYINT(1) DEFAULT 1,
    push_likes TINYINT(1) DEFAULT 1,
    push_subscribes TINYINT(1) DEFAULT 1,
    updated_at DATETIME DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
    FOREIGN KEY (usr_id) REFERENCES db_accountuser(usr_id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- Email queue for batched/delayed sending
CREATE TABLE IF NOT EXISTS db_email_queue (
    queue_id INT AUTO_INCREMENT PRIMARY KEY,
    usr_id INT NOT NULL,
    email VARCHAR(255) NOT NULL,
    subject VARCHAR(255) NOT NULL,
    body TEXT NOT NULL,
    scheduled_for DATETIME NOT NULL,
    sent_at DATETIME NULL,
    attempts INT DEFAULT 0,
    last_error TEXT NULL,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    INDEX idx_scheduled (scheduled_for, sent_at),
    INDEX idx_user (usr_id),
    FOREIGN KEY (usr_id) REFERENCES db_accountuser(usr_id) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;