CREATE TABLE IF NOT EXISTS users (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    username TEXT UNIQUE NOT NULL,
    password_hash TEXT NOT NULL,
    is_admin INTEGER DEFAULT 0
);

CREATE TABLE IF NOT EXISTS groups (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT UNIQUE NOT NULL
);

CREATE TABLE IF NOT EXISTS user_groups (
    user_id INTEGER,
    group_id INTEGER,
    PRIMARY KEY (user_id, group_id),
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
    FOREIGN KEY (group_id) REFERENCES groups(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS tasks (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    title TEXT NOT NULL,
    description TEXT,
    assignor_id INTEGER,
    assignee_type TEXT, 
    assignee_id INTEGER,
    status TEXT DEFAULT 'pending',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (assignor_id) REFERENCES users(id) ON DELETE SET NULL
);

CREATE TABLE IF NOT EXISTS passwords (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    title TEXT NOT NULL,
    username TEXT,
    password TEXT NOT NULL,
    url TEXT,
    notes TEXT,
    owner_id INTEGER,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (owner_id) REFERENCES users(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS password_shares (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    password_id INTEGER,
    share_type TEXT, 
    share_id INTEGER,
    FOREIGN KEY (password_id) REFERENCES passwords(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS projects (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    name TEXT NOT NULL,
    is_folder INTEGER DEFAULT 1,
    parent_id INTEGER DEFAULT NULL,
    file_path TEXT,
    owner_id INTEGER,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (parent_id) REFERENCES projects(id) ON DELETE CASCADE,
    FOREIGN KEY (owner_id) REFERENCES users(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS project_shares (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    project_id INTEGER,
    share_type TEXT,
    share_id INTEGER,
    FOREIGN KEY (project_id) REFERENCES projects(id) ON DELETE CASCADE
);

CREATE TABLE IF NOT EXISTS notifications (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    user_id INTEGER,
    message TEXT NOT NULL,
    is_read INTEGER DEFAULT 0,
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
    FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE
);