"""
Script interativo para configurar Supabase para RAG Template.

Facilita a configuracao do DATABASE_URL e testa a conexao.
"""

import os
import sys
from urllib.parse import quote_plus


def print_header():
    """Imprime o cabecalho do script."""
    print("=" * 60)
    print(" Setup Supabase para RAG Template")
    print("=" * 60)
    print()


def get_project_ref():
    """Solicita o Project Reference ID."""
    print("1. Obter Project Reference")
    print("   - Acesse seu projeto no Supabase")
    print("   - Va para Settings > Database")
    print("   - Copie o 'Reference ID' (formato: xxxxxxxxxxxxx)")
    print()
    project_ref = input("Project Reference ID: ").strip()
    return project_ref


def get_password():
    """Solicita a senha do banco."""
    print("\n2. Obter Senha do Banco")
    print("   - Use a senha que voce definiu ao criar o projeto")
    print("   - Ou resete em Settings > Database > Database Password")
    print()
    password = input("Database Password: ").strip()
    return password


def build_database_url(project_ref: str, password: str) -> str:
    """Constroi a DATABASE_URL."""
    # URL encode da senha para caracteres especiais
    encoded_password = quote_plus(password)

    # Construir URL
    database_url = (
        f"postgresql://postgres:{encoded_password}"
        f"@db.{project_ref}.supabase.co:5432/postgres"
    )

    return database_url


def save_to_env(database_url: str) -> bool:
    """Salva DATABASE_URL no arquivo .env."""
    print("\n3. Salvar no .env")

    # Verificar se .env ja existe
    env_path = ".env"
    if os.path.exists(env_path):
        print(f"   Arquivo .env encontrado")
        overwrite = input("   Sobrescrever DATABASE_URL existente? (s/n): ").strip().lower()
        if overwrite != 's':
            print("   Pulando salvamento no .env")
            return False

    # Ler conteudo existente
    existing_content = ""
    if os.path.exists(env_path):
        with open(env_path, 'r') as f:
            lines = f.readlines()
            # Remover linha DATABASE_URL existente
            existing_content = "".join(
                line for line in lines if not line.startswith("DATABASE_URL=")
            )

    # Adicionar nova DATABASE_URL
    with open(env_path, 'w') as f:
        f.write(existing_content)
        if existing_content and not existing_content.endswith('\n'):
            f.write('\n')
        f.write(f"DATABASE_URL={database_url}\n")

    print(f"   DATABASE_URL salvo em {env_path}")
    return True


def test_connection(database_url: str) -> bool:
    """Testa a conexao com o banco."""
    print("\n4. Testar Conexao")
    test = input("   Testar conexao agora? (s/n): ").strip().lower()

    if test != 's':
        print("   Pulando teste de conexao")
        return False

    try:
        # Importar aqui para nao quebrar se dependencias nao instaladas
        import psycopg
        from psycopg import sql

        print("   Conectando ao Supabase...")

        with psycopg.connect(database_url) as conn:
            with conn.cursor() as cur:
                # Testar conexao
                cur.execute("SELECT version();")
                version = cur.fetchone()[0]
                print(f"   Conexao bem-sucedida!")
                print(f"   PostgreSQL version: {version[:50]}...")

                # Verificar extensao pgvector
                cur.execute(
                    "SELECT EXISTS(SELECT 1 FROM pg_extension WHERE extname = 'vector');"
                )
                has_vector = cur.fetchone()[0]

                if has_vector:
                    print("   Extensao pgvector: INSTALADA")
                else:
                    print("   Extensao pgvector: NAO ENCONTRADA")
                    print("   Execute: CREATE EXTENSION vector;")
                    print("   No SQL Editor do Supabase")

        return True

    except ImportError:
        print("   ERRO: psycopg nao instalado")
        print("   Execute: pip install psycopg[binary]")
        return False

    except Exception as e:
        print(f"   ERRO ao conectar: {e}")
        print("\n   Verifique:")
        print("   - Project Reference correto")
        print("   - Senha correta")
        print("   - Supabase nao pausado (free tier pausa apos 1 semana)")
        return False


def print_next_steps(success: bool):
    """Imprime proximos passos."""
    print("\n" + "=" * 60)
    print(" Proximos Passos")
    print("=" * 60)

    if success:
        print("\n  Conexao configurada com sucesso!")
        print("\n  1. Certifique-se de ter HF_TOKEN no .env:")
        print("     HF_TOKEN=seu_token_huggingface")
        print("\n  2. Execute o app:")
        print("     python app.py")
        print("\n  3. Acesse: http://localhost:7860")
    else:
        print("\n  Configure DATABASE_URL manualmente no .env:")
        print("  DATABASE_URL=postgresql://postgres:SENHA@db.REF.supabase.co:5432/postgres")
        print("\n  Ou execute este script novamente")

    print("\n  Documentacao completa: docs/SUPABASE_SETUP.md")
    print("=" * 60)


def main():
    """Funcao principal."""
    print_header()

    # Coletar informacoes
    project_ref = get_project_ref()
    if not project_ref:
        print("ERRO: Project Reference vazio")
        sys.exit(1)

    password = get_password()
    if not password:
        print("ERRO: Senha vazia")
        sys.exit(1)

    # Construir URL
    database_url = build_database_url(project_ref, password)

    print("\n" + "=" * 60)
    print(" DATABASE_URL Gerado")
    print("=" * 60)
    print(f"\n{database_url}\n")

    # Salvar no .env
    saved = save_to_env(database_url)

    # Testar conexao
    success = test_connection(database_url)

    # Proximos passos
    print_next_steps(success and saved)


if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        print("\n\nSetup cancelado pelo usuario")
        sys.exit(0)