-- CourseHub schema (MySQL / MariaDB)
CREATE DATABASE IF NOT EXISTS coursehub CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
USE coursehub;

CREATE TABLE IF NOT EXISTS users (
    id            INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    username      VARCHAR(50)  NOT NULL UNIQUE,
    password_hash VARCHAR(255) NOT NULL,
    created_at    TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
) ENGINE=InnoDB;

-- One row per directory found under VIDEOS_ROOT.
-- `path` is the relative path from VIDEOS_ROOT, e.g. "Course 1/Intro".
CREATE TABLE IF NOT EXISTS folders (
    id         INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    parent_id  INT UNSIGNED NULL,
    name       VARCHAR(255) NOT NULL,
    path       VARCHAR(700) NOT NULL UNIQUE,
    depth      INT UNSIGNED NOT NULL DEFAULT 0,
    sort_order INT UNSIGNED NOT NULL DEFAULT 0,
    is_missing TINYINT(1) NOT NULL DEFAULT 0,
    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    CONSTRAINT fk_folders_parent FOREIGN KEY (parent_id)
        REFERENCES folders(id) ON DELETE CASCADE,
    INDEX idx_folders_parent (parent_id)
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS videos (
    id               INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,
    folder_id        INT UNSIGNED NOT NULL,
    name             VARCHAR(255) NOT NULL,   -- display name, filename without .mp4
    filename         VARCHAR(255) NOT NULL,
    path             VARCHAR(700) NOT NULL UNIQUE,  -- relative path incl. filename
    size_bytes       BIGINT UNSIGNED NOT NULL DEFAULT 0,
    duration_seconds FLOAT NULL,              -- filled in by the player on first load
    sort_order       INT UNSIGNED NOT NULL DEFAULT 0,
    is_missing       TINYINT(1) NOT NULL DEFAULT 0,
    created_at       TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
    CONSTRAINT fk_videos_folder FOREIGN KEY (folder_id)
        REFERENCES folders(id) ON DELETE CASCADE,
    INDEX idx_videos_folder (folder_id)
) ENGINE=InnoDB;

-- Per-user playback state: resume position + completion flag.
CREATE TABLE IF NOT EXISTS video_progress (
    user_id          INT UNSIGNED NOT NULL,
    video_id         INT UNSIGNED NOT NULL,
    position_seconds FLOAT NOT NULL DEFAULT 0,
    duration_seconds FLOAT NULL,
    completed        TINYINT(1) NOT NULL DEFAULT 0,
    updated_at       TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
        ON UPDATE CURRENT_TIMESTAMP,
    PRIMARY KEY (user_id, video_id),
    CONSTRAINT fk_vp_user  FOREIGN KEY (user_id)  REFERENCES users(id)  ON DELETE CASCADE,
    CONSTRAINT fk_vp_video FOREIGN KEY (video_id) REFERENCES videos(id) ON DELETE CASCADE,
    INDEX idx_vp_user_updated (user_id, updated_at)
) ENGINE=InnoDB;