-- Create task_status enum
CREATE TYPE task_status AS ENUM ('todo', 'inprogress', 'done', 'cancelled');

-- Create users table
CREATE TABLE users (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    email VARCHAR(255) UNIQUE NOT NULL,
    password VARCHAR(255) NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Create projects table
CREATE TABLE projects (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(255) NOT NULL,
    owner_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Create tasks table
CREATE TABLE tasks (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    project_id UUID NOT NULL REFERENCES projects(id) ON DELETE CASCADE,
    title VARCHAR(255) NOT NULL,
    description TEXT,
    status task_status NOT NULL DEFAULT 'todo',
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Create indexes for better performance
CREATE INDEX idx_projects_owner_id ON projects(owner_id);
CREATE INDEX idx_tasks_project_id ON tasks(project_id);
CREATE INDEX idx_tasks_status ON tasks(status);

-- Create updated_at trigger function
CREATE OR REPLACE FUNCTION update_updated_at_column()
RETURNS TRIGGER AS $$
BEGIN
    NEW.updated_at = NOW();
    RETURN NEW;
END;
$$ language 'plpgsql';

-- Create triggers to auto-update updated_at
CREATE TRIGGER update_users_updated_at 
    BEFORE UPDATE ON users 
    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_projects_updated_at 
    BEFORE UPDATE ON projects 
    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_tasks_updated_at 
    BEFORE UPDATE ON tasks 
    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();