-- Initial database setup for PostgreSQL
-- Migration: 001_initial_setup
-- Database: PostgreSQL

-- Enable UUID extension
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";

-- Users table for authentication
CREATE TABLE IF NOT EXISTS users (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    username VARCHAR(255) NOT NULL UNIQUE,
    email VARCHAR(255) NOT NULL UNIQUE,
    password_hash VARCHAR(255) NOT NULL,
    is_active BOOLEAN NOT NULL DEFAULT true,
    is_verified BOOLEAN NOT NULL DEFAULT false,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- User sessions table
CREATE TABLE IF NOT EXISTS user_sessions (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    session_token VARCHAR(255) NOT NULL UNIQUE,
    expires_at TIMESTAMPTZ NOT NULL,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- Content table for CMS functionality
CREATE TABLE IF NOT EXISTS content (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    title VARCHAR(255) NOT NULL,
    slug VARCHAR(255) NOT NULL UNIQUE,
    content_type VARCHAR(50) NOT NULL DEFAULT 'markdown',
    body TEXT,
    metadata JSONB,
    is_published BOOLEAN NOT NULL DEFAULT false,
    published_at TIMESTAMPTZ,
    created_by UUID REFERENCES users(id),
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- User roles table
CREATE TABLE IF NOT EXISTS user_roles (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    name VARCHAR(100) NOT NULL UNIQUE,
    description TEXT,
    permissions JSONB,
    created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
);

-- User role assignments
CREATE TABLE IF NOT EXISTS user_role_assignments (
    id UUID PRIMARY KEY DEFAULT uuid_generate_v4(),
    user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
    role_id UUID NOT NULL REFERENCES user_roles(id) ON DELETE CASCADE,
    assigned_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
    assigned_by UUID REFERENCES users(id),
    UNIQUE(user_id, role_id)
);

-- Create indexes for better performance
CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);
CREATE INDEX IF NOT EXISTS idx_users_username ON users(username);
CREATE INDEX IF NOT EXISTS idx_users_active ON users(is_active);
CREATE INDEX IF NOT EXISTS idx_user_sessions_token ON user_sessions(session_token);
CREATE INDEX IF NOT EXISTS idx_user_sessions_user_id ON user_sessions(user_id);
CREATE INDEX IF NOT EXISTS idx_user_sessions_expires ON user_sessions(expires_at);
CREATE INDEX IF NOT EXISTS idx_content_slug ON content(slug);
CREATE INDEX IF NOT EXISTS idx_content_published ON content(is_published);
CREATE INDEX IF NOT EXISTS idx_content_created_by ON content(created_by);
CREATE INDEX IF NOT EXISTS idx_content_type ON content(content_type);
CREATE INDEX IF NOT EXISTS idx_user_role_assignments_user ON user_role_assignments(user_id);
CREATE INDEX IF NOT EXISTS idx_user_role_assignments_role ON user_role_assignments(role_id);

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

-- Apply triggers to tables with updated_at columns
CREATE TRIGGER update_users_updated_at
    BEFORE UPDATE ON users
    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_content_updated_at
    BEFORE UPDATE ON content
    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();

-- Insert default roles
INSERT INTO user_roles (name, description, permissions) VALUES
('admin', 'Administrator with full access', '{"all": true}'),
('editor', 'Content editor', '{"content": {"read": true, "write": true, "delete": true}}'),
('user', 'Regular user', '{"content": {"read": true}}')
ON CONFLICT (name) DO NOTHING;