#!/usr/bin/env python3
"""
MARGARET - Log de entrada CORP
Servicio inmutable para recibir datos de PACKET
"""

import os
import hashlib
import json
from datetime import datetime
from flask import Flask, request, jsonify
import psycopg2
from psycopg2.extras import Json
import boto3
from botocore.client import Config

app = Flask(__name__)

# Configuración desde variables de entorno
H_INSTANCIA = os.getenv('H_INSTANCIA')
DB_HOST = os.getenv('DB_HOST', 'localhost')
DB_PORT = os.getenv('DB_PORT', '5432')
DB_NAME = os.getenv('DB_NAME', 'corp')
DB_USER = os.getenv('DB_USER', 'postgres')
DB_PASSWORD = os.getenv('DB_PASSWORD')

# Cloudflare R2
R2_ENDPOINT = os.getenv('R2_ENDPOINT')
R2_ACCESS_KEY = os.getenv('R2_ACCESS_KEY')
R2_SECRET_KEY = os.getenv('R2_SECRET_KEY')
R2_BUCKET = os.getenv('R2_BUCKET', 'corp')

# Cliente S3 (compatible con R2)
s3_client = boto3.client(
    's3',
    endpoint_url=R2_ENDPOINT,
    aws_access_key_id=R2_ACCESS_KEY,
    aws_secret_access_key=R2_SECRET_KEY,
    config=Config(signature_version='s3v4'),
    region_name='auto'
)


def get_db_connection():
    """Obtener conexión a PostgreSQL"""
    return psycopg2.connect(
        host=DB_HOST,
        port=DB_PORT,
        database=DB_NAME,
        user=DB_USER,
        password=DB_PASSWORD
    )


def verify_auth(request):
    """Verificar autenticación mediante X-Auth-Key"""
    auth_key = request.headers.get('X-Auth-Key')
    if not auth_key or auth_key != H_INSTANCIA:
        return False
    return True


def upload_to_r2(file_data, file_path):
    """Subir archivo a R2"""
    try:
        s3_client.put_object(
            Bucket=R2_BUCKET,
            Key=file_path,
            Body=file_data
        )
        return True
    except Exception as e:
        app.logger.error(f"Error subiendo a R2: {e}")
        return False


@app.route('/health', methods=['GET'])
def health():
    """Endpoint de salud"""
    return jsonify({
        "service": "margaret",
        "status": "ok",
        "timestamp": datetime.utcnow().isoformat()
    })


@app.route('/ingest', methods=['POST'])
def ingest():
    """
    Endpoint principal para recibir contenedores de PACKET
    """
    if not verify_auth(request):
        return jsonify({"error": "unauthorized"}), 401

    try:
        contenedor = request.get_json()

        if not contenedor.get('id'):
            return jsonify({"error": "missing_id"}), 400

        if not contenedor.get('archivo_hash'):
            return jsonify({"error": "missing_archivo_hash"}), 400

        h_entrada = contenedor['archivo_hash']

        conn = get_db_connection()
        cur = conn.cursor()

        cur.execute(
            "SELECT id FROM margaret_log WHERE h_entrada = %s",
            (h_entrada,)
        )

        if cur.fetchone():
            cur.close()
            conn.close()
            return jsonify({"error": "hash_exists"}), 409

        r2_paths = {}
        if 'archivos' in contenedor:
            for idx, archivo in enumerate(contenedor['archivos']):
                if 'data' in archivo:
                    file_data = archivo['data']
                    file_name = archivo.get('nombre', f'archivo_{idx}')
                    r2_path = f"{H_INSTANCIA}/{h_entrada}/{file_name}"

                    if upload_to_r2(file_data, r2_path):
                        r2_paths[file_name] = r2_path
                    else:
                        cur.close()
                        conn.close()
                        return jsonify({"error": "r2_upload_failed"}), 500

        cur.execute(
            """
            INSERT INTO margaret_log (h_instancia, h_entrada, contenedor, r2_paths)
            VALUES (%s, %s, %s, %s)
            RETURNING id
            """,
            (H_INSTANCIA, h_entrada, Json(contenedor), Json(r2_paths))
        )

        record_id = cur.fetchone()[0]
        conn.commit()
        cur.close()
        conn.close()

        app.logger.info(f"Contenedor registrado: {record_id} - {h_entrada}")

        return jsonify({
            "ok": True,
            "id": record_id,
            "h_entrada": h_entrada
        }), 200

    except Exception as e:
        app.logger.error(f"Error en /ingest: {e}")
        return jsonify({"error": "internal_error", "detail": str(e)}), 500


@app.route('/query/<h_entrada>', methods=['GET'])
def query(h_entrada):
    if not verify_auth(request):
        return jsonify({"error": "unauthorized"}), 401

    try:
        conn = get_db_connection()
        cur = conn.cursor()

        cur.execute(
            """
            SELECT id, h_entrada, contenedor, r2_paths, created_at
            FROM margaret_log
            WHERE h_entrada = %s AND h_instancia = %s
            """,
            (h_entrada, H_INSTANCIA)
        )

        row = cur.fetchone()
        cur.close()
        conn.close()

        if not row:
            return jsonify({"error": "not_found"}), 404

        return jsonify({
            "id": row[0],
            "h_entrada": row[1],
            "contenedor": row[2],
            "r2_paths": row[3],
            "created_at": row[4].isoformat()
        }), 200

    except Exception as e:
        app.logger.error(f"Error en /query: {e}")
        return jsonify({"error": "internal_error"}), 500


@app.route('/list', methods=['GET'])
def list_entries():
    if not verify_auth(request):
        return jsonify({"error": "unauthorized"}), 401

    try:
        limit = int(request.args.get('limit', 50))
        offset = int(request.args.get('offset', 0))

        conn = get_db_connection()
        cur = conn.cursor()

        cur.execute(
            """
            SELECT id, h_entrada, created_at
            FROM margaret_log
            WHERE h_instancia = %s
            ORDER BY id DESC
            LIMIT %s OFFSET %s
            """,
            (H_INSTANCIA, limit, offset)
        )

        rows = cur.fetchall()

        cur.execute(
            "SELECT COUNT(*) FROM margaret_log WHERE h_instancia = %s",
            (H_INSTANCIA,)
        )
        total = cur.fetchone()[0]

        cur.close()
        conn.close()

        return jsonify({
            "total": total,
            "limit": limit,
            "offset": offset,
            "entries": [
                {
                    "id": row[0],
                    "h_entrada": row[1],
                    "created_at": row[2].isoformat()
                }
                for row in rows
            ]
        }), 200

    except Exception as e:
        app.logger.error(f"Error en /list: {e}")
        return jsonify({"error": "internal_error"}), 500


if __name__ == '__main__':
    port = int(os.getenv('PORT', 5051))
    app.run(host='0.0.0.0', port=port, debug=False)