-- Migration: Structure de base de données simplifiée pour chat server
-- Création: 2025-07-26
-- Version: 1.0.0 Production Ready

-- Extensions requises
CREATE EXTENSION IF NOT EXISTS "uuid-ossp";
CREATE EXTENSION IF NOT EXISTS "pgcrypto";

-- ================================================================
-- TABLE UTILISATEURS
-- ================================================================

CREATE TABLE IF NOT EXISTS users (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    username VARCHAR(50) UNIQUE NOT NULL,
    email VARCHAR(255) UNIQUE NOT NULL,
    display_name VARCHAR(100),
    avatar_url TEXT,
    is_active BOOLEAN NOT NULL DEFAULT true,
    last_seen TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
);

-- ================================================================
-- TABLE CONVERSATIONS
-- ================================================================

CREATE TABLE IF NOT EXISTS conversations (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    name VARCHAR(255) NOT NULL,
    description TEXT,
    conversation_type VARCHAR(50) NOT NULL DEFAULT 'direct',
    is_private BOOLEAN NOT NULL DEFAULT false,
    created_by UUID REFERENCES users(id) ON DELETE CASCADE,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW()
);

-- ================================================================
-- TABLE MEMBRES DES CONVERSATIONS
-- ================================================================

CREATE TABLE IF NOT EXISTS conversation_members (
    conversation_id UUID REFERENCES conversations(id) ON DELETE CASCADE,
    user_id UUID REFERENCES users(id) ON DELETE CASCADE,
    role VARCHAR(50) NOT NULL DEFAULT 'user',
    joined_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    PRIMARY KEY (conversation_id, user_id)
);

-- ================================================================
-- TABLE MESSAGES
-- ================================================================

CREATE TABLE IF NOT EXISTS messages (
    id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
    conversation_id UUID REFERENCES conversations(id) ON DELETE CASCADE,
    sender_id UUID REFERENCES users(id) ON DELETE CASCADE,
    content TEXT NOT NULL,
    message_type VARCHAR(50) NOT NULL DEFAULT 'text',
    parent_message_id UUID REFERENCES messages(id) ON DELETE CASCADE,
    is_pinned BOOLEAN NOT NULL DEFAULT false,
    is_deleted BOOLEAN NOT NULL DEFAULT false,
    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    updated_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT NOW(),
    status VARCHAR(50) NOT NULL DEFAULT 'sent'
);

-- ================================================================
-- INDEX POUR PERFORMANCE
-- ================================================================

CREATE INDEX IF NOT EXISTS idx_messages_conversation_id ON messages(conversation_id);
CREATE INDEX IF NOT EXISTS idx_messages_sender_id ON messages(sender_id);
CREATE INDEX IF NOT EXISTS idx_messages_created_at ON messages(created_at);
CREATE INDEX IF NOT EXISTS idx_conversation_members_conversation_id ON conversation_members(conversation_id);
CREATE INDEX IF NOT EXISTS idx_conversation_members_user_id ON conversation_members(user_id);
CREATE INDEX IF NOT EXISTS idx_users_username ON users(username);
CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);

-- ================================================================
-- TRIGGERS POUR MISE À JOUR AUTOMATIQUE
-- ================================================================

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

CREATE TRIGGER update_users_updated_at BEFORE UPDATE ON users
    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_conversations_updated_at BEFORE UPDATE ON conversations
    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();

CREATE TRIGGER update_messages_updated_at BEFORE UPDATE ON messages
    FOR EACH ROW EXECUTE FUNCTION update_updated_at_column();

-- ================================================================
-- DONNÉES DE TEST
-- ================================================================

-- Insérer un utilisateur de test
INSERT INTO users (username, email, display_name) 
VALUES ('test_user', 'test@veza.com', 'Test User')
ON CONFLICT (username) DO NOTHING;

-- Insérer une conversation de test
INSERT INTO conversations (name, description, conversation_type, created_by)
SELECT 'Test Room', 'Room de test pour Veza', 'group', id 
FROM users WHERE username = 'test_user'
ON CONFLICT DO NOTHING;