import os
import sys
import hashlib
import csv
import math
from io import StringIO, BytesIO
from datetime import datetime, timedelta
import logging
import atexit
import zipfile
from contextlib import contextmanager
from concurrent.futures import ThreadPoolExecutor, as_completed
from tqdm import tqdm

from flask import Flask, render_template, request, redirect, url_for, Response, flash
import psycopg2
import psycopg2.extras
import psycopg2.pool
import bleach

from feed_processor import process_single_feed
from url_processor import process_newspaper_url

logging.basicConfig(stream=sys.stdout, level=logging.INFO, format='[%(asctime)s] %(levelname)s in %(module)s: %(message)s')

app = Flask(__name__)
app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY', os.urandom(24))

DB_CONFIG = {
    "host": os.environ.get("DB_HOST", "localhost"),
    "port": int(os.environ.get("DB_PORT", 5432)),
    "dbname": os.environ.get("DB_NAME", "rss"),
    "user": os.environ.get("DB_USER", "rss"),
    "password": os.environ.get("DB_PASS", "x")
}

MAX_WORKERS = int(os.environ.get("RSS_MAX_WORKERS", 20))
SINGLE_FEED_TIMEOUT = int(os.environ.get("RSS_FEED_TIMEOUT", 30))
MAX_FALLOS = int(os.environ.get("RSS_MAX_FAILURES", 5))

db_pool = None
try:
    db_pool = psycopg2.pool.SimpleConnectionPool(minconn=1, maxconn=10, **DB_CONFIG)
    app.logger.info("Pool de conexiones a la base de datos creado exitosamente.")
except psycopg2.OperationalError as e:
    logging.error(f"FATAL: No se pudo conectar a la base de datos para crear el pool: {e}")

@contextmanager
def get_conn():
    if not db_pool: raise ConnectionError("El pool de la base de datos no está disponible.")
    conn = None
    try:
        conn = db_pool.getconn()
        yield conn
        conn.commit()
    except Exception as e:
        if conn: conn.rollback()
        raise e
    finally:
        if conn: db_pool.putconn(conn)

@atexit.register
def shutdown_hooks():
    if db_pool:
        db_pool.closeall()
        app.logger.info("Pool de conexiones de la base de datos cerrado.")

@app.template_filter('safe_html')
def safe_html(text):
    if not text: return ""
    return bleach.clean(text, tags={'a', 'b', 'strong', 'i', 'em', 'p', 'br'}, attributes={'a': ['href', 'title']}, strip=True)

def _get_form_dependencies(cursor):
    cursor.execute("SELECT id, nombre FROM categorias ORDER BY nombre")
    categorias = cursor.fetchall()
    cursor.execute("SELECT id, nombre, continente_id FROM paises ORDER BY nombre")
    paises = cursor.fetchall()
    return categorias, paises

@app.route("/")
def home():
    cat_id, cont_id, pais_id, fecha_filtro = request.args.get("categoria_id"), request.args.get("continente_id"), request.args.get("pais_id"), request.args.get("fecha")
    q = request.args.get("q", "").strip()
    noticias, categorias, continentes, paises = [], [], [], []
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                cursor.execute("SELECT id, nombre FROM categorias ORDER BY nombre")
                categorias = cursor.fetchall()
                cursor.execute("SELECT id, nombre FROM continentes ORDER BY nombre")
                continentes = cursor.fetchall()
                cursor.execute("SELECT id, nombre, continente_id FROM paises ORDER BY nombre")
                paises = cursor.fetchall()

                sql_params, conditions = [], []
                sql_base = "SELECT n.fecha, n.titulo, n.resumen, n.url, n.imagen_url, c.nombre AS categoria, p.nombre AS pais, co.nombre AS continente FROM noticias n LEFT JOIN categorias c ON n.categoria_id = c.id LEFT JOIN paises p ON n.pais_id = p.id LEFT JOIN continentes co ON p.continente_id = co.id"

                if q:
                    search_query = " & ".join(q.split())
                    conditions.append("n.tsv @@ to_tsquery('spanish', %s)")
                    sql_params.append(search_query)
                if cat_id: conditions.append("n.categoria_id = %s"); sql_params.append(cat_id)
                if pais_id: conditions.append("n.pais_id = %s"); sql_params.append(pais_id)
                elif cont_id: conditions.append("p.continente_id = %s"); sql_params.append(cont_id)
                if fecha_filtro:
                    try:
                        fecha_obj = datetime.strptime(fecha_filtro, '%Y-%m-%d')
                        conditions.append("n.fecha::date = %s")
                        sql_params.append(fecha_obj.date())
                    except ValueError:
                        flash("Formato de fecha no válido. Use AAAA-MM-DD.", "error")

                if conditions: sql_base += " WHERE " + " AND ".join(conditions)

                order_clause = " ORDER BY n.fecha DESC NULLS LAST"
                if q:
                    search_query_ts = " & ".join(q.split())
                    order_clause = " ORDER BY ts_rank(n.tsv, to_tsquery('spanish', %s)) DESC, n.fecha DESC"
                    sql_params.append(search_query_ts)

                sql_final = sql_base + order_clause + " LIMIT 50"
                cursor.execute(sql_final, tuple(sql_params))
                noticias = cursor.fetchall()

    except psycopg2.Error as db_err:
        app.logger.error(f"[DB ERROR] Al leer noticias: {db_err}", exc_info=True)
        flash("Error de base de datos al cargar las noticias.", "error")

    if request.headers.get('X-Requested-With') == 'XMLHttpRequest':
        return render_template('_noticias_list.html', noticias=noticias)

    return render_template("noticias.html",
                           noticias=noticias, categorias=categorias, continentes=continentes, paises=paises,
                           cat_id=int(cat_id) if cat_id else None, cont_id=int(cont_id) if cont_id else None,
                           pais_id=int(pais_id) if pais_id else None, fecha_filtro=fecha_filtro, q=q)

@app.route("/dashboard")
def dashboard():
    stats = {'feeds_totales': 0, 'noticias_totales': 0, 'feeds_caidos': 0}
    try:
        with get_conn() as conn:
            with conn.cursor() as cursor:
                cursor.execute("SELECT COUNT(*) FROM feeds")
                stats['feeds_totales'] = cursor.fetchone()[0]
                cursor.execute("SELECT COUNT(*) FROM noticias")
                stats['noticias_totales'] = cursor.fetchone()[0]
                cursor.execute("SELECT COUNT(*) FROM feeds WHERE activo = FALSE")
                stats['feeds_caidos'] = cursor.fetchone()[0]
    except psycopg2.Error as db_err:
        app.logger.error(f"[DB ERROR] Al calcular estadísticas: {db_err}")
        flash("Error al conectar con la base de datos.", "error")
    return render_template("dashboard.html", stats=stats)


# --- GESTIÓN DE FEEDS ---

@app.route("/feeds/manage")
def manage_feeds():
    page = request.args.get('page', 1, type=int)
    per_page = 20
    offset = (page - 1) * per_page
    feeds_list, total_feeds = [], 0
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                cursor.execute("SELECT COUNT(*) FROM feeds")
                total_feeds = cursor.fetchone()[0]
                cursor.execute("SELECT f.id, f.nombre, f.url, c.nombre as categoria, p.nombre as pais, f.idioma, f.activo FROM feeds f LEFT JOIN categorias c ON f.categoria_id = c.id LEFT JOIN paises p ON f.pais_id = p.id ORDER BY f.nombre LIMIT %s OFFSET %s", (per_page, offset))
                feeds_list = cursor.fetchall()
    except psycopg2.Error as db_err:
        app.logger.error(f"[DB ERROR] Al obtener lista de feeds: {db_err}")
        flash("Error al obtener la lista de feeds.", "error")
    total_pages = math.ceil(total_feeds / per_page) if total_feeds > 0 else 0
    return render_template("feeds_list.html", feeds=feeds_list, page=page, total_pages=total_pages, total_feeds=total_feeds)

@app.route("/feeds/add", methods=['GET', 'POST'])
def add_feed():
    if request.method == 'POST':
        nombre = request.form.get("nombre")
        try:
            with get_conn() as conn:
                with conn.cursor() as cursor:
                    categoria_id = int(request.form.get("categoria_id")) if request.form.get("categoria_id") else None
                    pais_id = int(request.form.get("pais_id")) if request.form.get("pais_id") else None
                    cursor.execute(
                        "INSERT INTO feeds (nombre, descripcion, url, categoria_id, pais_id, idioma) VALUES (%s, %s, %s, %s, %s, %s)",
                        (nombre, request.form.get("descripcion"), request.form.get("url"), categoria_id, pais_id, (request.form.get("idioma", "").strip() or None))
                    )
            flash(f"Feed '{nombre}' añadido correctamente.", "success")
        except psycopg2.Error as db_err:
            app.logger.error(f"[DB ERROR] Al agregar feed: {db_err}", exc_info=True)
            flash(f"Error al añadir el feed: {db_err}", "error")
        return redirect(url_for("manage_feeds"))

    categorias, paises = [], []
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                categorias, paises = _get_form_dependencies(cursor)
    except psycopg2.Error as db_err:
        app.logger.error(f"[DB ERROR] Al cargar formulario: {db_err}")
        flash("No se pudieron cargar las categorías o países.", "error")
    return render_template("add_feed.html", categorias=categorias, paises=paises)

@app.route("/feeds/edit/<int:feed_id>", methods=["GET", "POST"])
def edit_feed(feed_id):
    if request.method == "POST":
        try:
            with get_conn() as conn:
                with conn.cursor() as cursor:
                    categoria_id = int(request.form.get("categoria_id")) if request.form.get("categoria_id") else None
                    pais_id = int(request.form.get("pais_id")) if request.form.get("pais_id") else None
                    idioma = request.form.get("idioma", "").strip() or None
                    activo = "activo" in request.form
                    cursor.execute(
                        "UPDATE feeds SET nombre=%s, descripcion=%s, url=%s, categoria_id=%s, pais_id=%s, idioma=%s, activo=%s WHERE id=%s",
                        (request.form.get("nombre"), request.form.get("descripcion"), request.form.get("url"), categoria_id, pais_id, idioma, activo, feed_id)
                    )
            flash("Feed actualizado correctamente.", "success")
        except psycopg2.Error as db_err:
            app.logger.error(f"[DB ERROR] Al actualizar feed: {db_err}", exc_info=True)
            flash(f"Error al actualizar el feed: {db_err}", "error")
        return redirect(url_for("manage_feeds"))

    feed, categorias, paises = None, [], []
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                cursor.execute("SELECT * FROM feeds WHERE id = %s", (feed_id,))
                feed = cursor.fetchone()
                if not feed:
                    flash("No se encontró el feed solicitado.", "error")
                    return redirect(url_for("manage_feeds"))
                categorias, paises = _get_form_dependencies(cursor)
    except psycopg2.Error as db_err:
        flash("Error al cargar el feed para editar.", "error")
        return redirect(url_for("manage_feeds"))
    return render_template("edit_feed.html", feed=feed, categorias=categorias, paises=paises)

@app.route("/feeds/delete/<int:feed_id>")
def delete_feed(feed_id):
    try:
        with get_conn() as conn:
            with conn.cursor() as cursor:
                cursor.execute("DELETE FROM feeds WHERE id=%s", (feed_id,))
        flash("Feed eliminado correctamente.", "success")
    except psycopg2.Error as db_err:
        app.logger.error(f"[DB ERROR] Al eliminar feed: {db_err}", exc_info=True)
        flash(f"Error al eliminar el feed: {db_err}", "error")
    return redirect(url_for("manage_feeds"))

@app.route("/feeds/reactivar/<int:feed_id>")
def reactivar_feed(feed_id):
    try:
        with get_conn() as conn:
            with conn.cursor() as cursor:
                cursor.execute("UPDATE feeds SET activo = TRUE, fallos = 0 WHERE id = %s", (feed_id,))
        flash("Feed reactivado.", "success")
    except psycopg2.Error as db_err:
        flash(f"Error al reactivar feed: {db_err}", "error")
    return redirect(url_for("manage_feeds"))


# --- GESTIÓN DE FUENTES URL ---

@app.route("/urls/manage")
def manage_urls():
    fuentes = []
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                cursor.execute("SELECT f.id, f.nombre, f.url, c.nombre as categoria, p.nombre as pais, f.idioma FROM fuentes_url f LEFT JOIN categorias c ON f.categoria_id = c.id LEFT JOIN paises p ON f.pais_id = p.id ORDER BY f.nombre")
                fuentes = cursor.fetchall()
    except psycopg2.Error as db_err:
        app.logger.error(f"[DB ERROR] Al obtener lista de fuentes URL: {db_err}")
        flash("Error al obtener la lista de fuentes URL.", "error")
    return render_template("urls_list.html", fuentes=fuentes)

@app.route("/urls/add", methods=['GET', 'POST'])
def add_url_source():
    if request.method == 'POST':
        nombre = request.form.get("nombre")
        try:
            with get_conn() as conn:
                with conn.cursor() as cursor:
                    categoria_id = int(request.form.get("categoria_id")) if request.form.get("categoria_id") else None
                    pais_id = int(request.form.get("pais_id")) if request.form.get("pais_id") else None
                    idioma = request.form.get("idioma", "es").strip().lower()
                    cursor.execute(
                        "INSERT INTO fuentes_url (nombre, url, categoria_id, pais_id, idioma) VALUES (%s, %s, %s, %s, %s)",
                        (nombre, request.form.get("url"), categoria_id, pais_id, idioma)
                    )
            flash(f"Fuente URL '{nombre}' añadida correctamente.", "success")
        except psycopg2.Error as db_err:
            app.logger.error(f"[DB ERROR] Al agregar fuente URL: {db_err}", exc_info=True)
            flash(f"Error al añadir la fuente URL: {db_err}", "error")
        return redirect(url_for("manage_urls"))

    categorias, paises = [], []
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                categorias, paises = _get_form_dependencies(cursor)
    except psycopg2.Error as db_err:
        app.logger.error(f"[DB ERROR] Al cargar formulario: {db_err}")
        flash("No se pudieron cargar las categorías o países.", "error")
    return render_template("add_url_source.html", categorias=categorias, paises=paises)

@app.route("/urls/edit/<int:url_id>", methods=["GET", "POST"])
def edit_url_source(url_id):
    if request.method == "POST":
        try:
            with get_conn() as conn:
                with conn.cursor() as cursor:
                    categoria_id = int(request.form.get("categoria_id")) if request.form.get("categoria_id") else None
                    pais_id = int(request.form.get("pais_id")) if request.form.get("pais_id") else None
                    idioma = request.form.get("idioma", "es").strip().lower()
                    cursor.execute(
                        "UPDATE fuentes_url SET nombre=%s, url=%s, categoria_id=%s, pais_id=%s, idioma=%s WHERE id=%s",
                        (request.form.get("nombre"), request.form.get("url"), categoria_id, pais_id, idioma, url_id)
                    )
            flash("Fuente URL actualizada correctamente.", "success")
        except psycopg2.Error as db_err:
            app.logger.error(f"[DB ERROR] Al actualizar fuente URL: {db_err}", exc_info=True)
            flash(f"Error al actualizar la fuente URL: {db_err}", "error")
        return redirect(url_for("manage_urls"))

    fuente, categorias, paises = None, [], []
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                cursor.execute("SELECT * FROM fuentes_url WHERE id = %s", (url_id,))
                fuente = cursor.fetchone()
                if not fuente:
                    flash("No se encontró la fuente URL solicitada.", "error")
                    return redirect(url_for("manage_urls"))
                categorias, paises = _get_form_dependencies(cursor)
    except psycopg2.Error as db_err:
        flash("Error al cargar la fuente URL para editar.", "error")
        return redirect(url_for("manage_urls"))
    return render_template("edit_url_source.html", fuente=fuente, categorias=categorias, paises=paises)

@app.route("/urls/delete/<int:url_id>")
def delete_url_source(url_id):
    try:
        with get_conn() as conn:
            with conn.cursor() as cursor:
                cursor.execute("DELETE FROM fuentes_url WHERE id=%s", (url_id,))
        flash("Fuente URL eliminada correctamente.", "success")
    except psycopg2.Error as db_err:
        flash(f"Error al eliminar la fuente URL: {db_err}", "error")
    return redirect(url_for("manage_urls"))

# --- PROCESAMIENTO DE URLS ---

@app.route("/scrape_url", methods=['GET', 'POST'])
def scrape_url():
    if request.method == 'POST':
        source_id = request.form.get("source_id")
        if not source_id:
            flash("Debes seleccionar una fuente para procesar.", "error")
            return redirect(url_for('scrape_url'))

        try:
            with get_conn() as conn:
                with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                    cursor.execute("SELECT * FROM fuentes_url WHERE id = %s", (source_id,))
                    source = cursor.fetchone()

                if not source:
                    flash("La fuente seleccionada no existe.", "error")
                    return redirect(url_for('scrape_url'))

                lista_noticias, message = process_newspaper_url(source['url'], source['categoria_id'], source['pais_id'], source['idioma'])

                if lista_noticias:
                    # Se necesita una nueva conexión/cursor para la inserción
                    with get_conn() as insert_conn:
                        with insert_conn.cursor() as insert_cursor:
                            insert_query = """
                                INSERT INTO noticias (id, titulo, resumen, url, fecha, imagen_url, categoria_id, pais_id)
                                VALUES %s
                                ON CONFLICT (url) DO UPDATE SET
                                    titulo = EXCLUDED.titulo,
                                    resumen = EXCLUDED.resumen,
                                    fecha = EXCLUDED.fecha,
                                    imagen_url = EXCLUDED.imagen_url;
                            """
                            psycopg2.extras.execute_values(insert_cursor, insert_query, lista_noticias)
                    flash(f"Se encontraron y guardaron {len(lista_noticias)} noticias desde '{source['nombre']}'.", "success")
                    return redirect(url_for("home"))
                else:
                    flash(message, "warning")
        
        except psycopg2.Error as db_err:
            app.logger.error(f"[DB ERROR] Al procesar fuente URL: {db_err}", exc_info=True)
            flash(f"Error de base de datos al procesar la fuente: {db_err}", "error")
        
        return redirect(url_for('scrape_url'))

    fuentes = []
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                cursor.execute("SELECT id, nombre FROM fuentes_url ORDER BY nombre")
                fuentes = cursor.fetchall()
    except psycopg2.Error as db_err:
        flash("Error al cargar las fuentes de URL.", "error")

    return render_template("scrape_url.html", fuentes=fuentes)

# --- BACKUP Y RESTORE ---
@app.route("/backup_feeds")
def backup_feeds():
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                cursor.execute("SELECT f.id, f.nombre, f.descripcion, f.url, f.categoria_id, c.nombre AS categoria, f.pais_id, p.nombre AS pais, f.idioma, f.activo, f.fallos FROM feeds f LEFT JOIN categorias c ON f.categoria_id = c.id LEFT JOIN paises p ON f.pais_id = p.id ORDER BY f.id")
                feeds_ = cursor.fetchall()
        if not feeds_:
            flash("No hay feeds para exportar.", "warning")
            return redirect(url_for("dashboard"))
        
        fieldnames = list(feeds_[0].keys())
        output = StringIO()
        writer = csv.DictWriter(output, fieldnames=fieldnames)
        writer.writeheader()
        writer.writerows([dict(feed) for feed in feeds_])
        return Response(output.getvalue(), mimetype="text/csv", headers={"Content-Disposition": "attachment;filename=feeds_backup.csv"})
    except Exception as e:
        app.logger.error(f"[ERROR] Al hacer backup de feeds: {e}", exc_info=True)
        flash(f"Error interno al generar el backup: {e}", "error")
        return redirect(url_for("dashboard"))

@app.route("/backup_noticias")
def backup_noticias():
    try:
        with get_conn() as conn:
            with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                cursor.execute("SELECT n.id, n.titulo, n.resumen, n.url, n.fecha, n.imagen_url, c.nombre AS categoria, p.nombre AS pais, co.nombre AS continente FROM noticias n LEFT JOIN categorias c ON n.categoria_id = c.id LEFT JOIN paises p ON n.pais_id = p.id LEFT JOIN continentes co ON p.continente_id = co.id ORDER BY n.fecha DESC")
                noticias = cursor.fetchall()
        if not noticias:
            flash("No hay noticias para exportar.", "warning")
            return redirect(url_for("dashboard"))
        
        fieldnames_noticias = list(noticias[0].keys())
        output = StringIO()
        writer = csv.DictWriter(output, fieldnames=fieldnames_noticias)
        writer.writeheader()
        writer.writerows([dict(noticia) for noticia in noticias])
        return Response(output.getvalue(), mimetype="text/csv", headers={"Content-Disposition": "attachment;filename=noticias_backup.csv"})
    except Exception as e:
        app.logger.error(f"[ERROR] Al hacer backup de noticias: {e}", exc_info=True)
        flash(f"Error interno al generar el backup: {e}", "error")
        return redirect(url_for("dashboard"))

@app.route("/backup_completo")
def backup_completo():
    try:
        memory_buffer = BytesIO()
        with zipfile.ZipFile(memory_buffer, 'w', zipfile.ZIP_DEFLATED) as zipf:
            with get_conn() as conn:
                with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                    cursor.execute("SELECT f.id, f.nombre, f.descripcion, f.url, f.categoria_id, c.nombre AS categoria, f.pais_id, p.nombre AS pais, f.idioma, f.activo, f.fallos FROM feeds f LEFT JOIN categorias c ON f.categoria_id = c.id LEFT JOIN paises p ON f.pais_id = p.id ORDER BY f.id")
                    feeds_data = cursor.fetchall()
                    if feeds_data:
                        fieldnames_feeds = list(feeds_data[0].keys())
                        output = StringIO()
                        writer = csv.DictWriter(output, fieldnames=fieldnames_feeds)
                        writer.writeheader()
                        writer.writerows([dict(f) for f in feeds_data])
                        zipf.writestr("feeds.csv", output.getvalue())

                    cursor.execute("SELECT n.id, n.titulo, n.resumen, n.url, n.fecha, n.imagen_url, c.nombre AS categoria, p.nombre AS pais, co.nombre AS continente FROM noticias n LEFT JOIN categorias c ON n.categoria_id = c.id LEFT JOIN paises p ON n.pais_id = p.id LEFT JOIN continentes co ON p.continente_id = co.id ORDER BY n.fecha DESC")
                    noticias_data = cursor.fetchall()
                    if noticias_data:
                        fieldnames_noticias = list(noticias_data[0].keys())
                        output = StringIO()
                        writer = csv.DictWriter(output, fieldnames=fieldnames_noticias)
                        writer.writeheader()
                        writer.writerows([dict(n) for n in noticias_data])
                        zipf.writestr("noticias.csv", output.getvalue())
        memory_buffer.seek(0)
        return Response(memory_buffer, mimetype="application/zip", headers={"Content-Disposition": "attachment;filename=rss_backup_completo.zip"})
    except Exception as e:
        app.logger.error(f"[ERROR] Al hacer backup completo: {e}", exc_info=True)
        flash(f"Error interno al generar el backup: {e}", "error")
        return redirect(url_for("dashboard"))

@app.route("/restore_feeds", methods=["GET", "POST"])
def restore_feeds():
    if request.method == "POST":
        file = request.files.get("file")
        if not file or not file.filename.endswith(".csv"):
            flash("Archivo no válido. Sube un .csv.", "error")
            return redirect(url_for("restore_feeds"))
        try:
            file_stream = StringIO(file.read().decode("utf-8", errors='ignore'))
            reader = csv.DictReader(file_stream)
            rows = list(reader)
            n_ok, n_err = 0, 0
            with get_conn() as conn:
                for row in rows:
                    with conn.cursor() as cursor:
                        try:
                            cursor.execute("SAVEPOINT restore_feed_row")
                            activo = str(row.get("activo", "")).strip().lower() in ["1", "true", "t", "yes", "on"]
                            cat_id = int(row["categoria_id"]) if row.get("categoria_id") and row["categoria_id"].strip() else None
                            pais_id = int(row["pais_id"]) if row.get("pais_id") and row["pais_id"].strip() else None
                            cursor.execute(
                                """
                                INSERT INTO feeds (id, nombre, descripcion, url, categoria_id, pais_id, idioma, activo, fallos)
                                VALUES (%(id)s, %(nombre)s, %(descripcion)s, %(url)s, %(categoria_id)s, %(pais_id)s, %(idioma)s, %(activo)s, %(fallos)s)
                                ON CONFLICT (id) DO UPDATE SET
                                    nombre=EXCLUDED.nombre, descripcion=EXCLUDED.descripcion, url=EXCLUDED.url, categoria_id=EXCLUDED.categoria_id,
                                    pais_id=EXCLUDED.pais_id, idioma=EXCLUDED.idioma, activo=EXCLUDED.activo, fallos=EXCLUDED.fallos;
                                """,
                                {"id": int(row["id"]), "nombre": row.get("nombre"), "descripcion": row.get("descripcion") or "", "url": row.get("url"),
                                 "categoria_id": cat_id, "pais_id": pais_id, "idioma": row.get("idioma") or None, "activo": activo,
                                 "fallos": int(row.get("fallos", 0) or 0)}
                            )
                            n_ok += 1
                            cursor.execute("RELEASE SAVEPOINT restore_feed_row")
                        except Exception as e:
                            cursor.execute("ROLLBACK TO SAVEPOINT restore_feed_row")
                            n_err += 1
                            app.logger.error(f"Error procesando fila (se omite): {row} - Error: {e}")
            flash(f"Restauración completada. Feeds procesados: {n_ok}. Errores: {n_err}.", "success" if n_err == 0 else "warning")
        except Exception as e:
            app.logger.error(f"Error al restaurar feeds desde CSV: {e}", exc_info=True)
            flash(f"Ocurrió un error general al procesar el archivo: {e}", "error")
        return redirect(url_for("dashboard"))
    return render_template("restore_feeds.html")


# --- TAREA DE FONDO ---

def fetch_and_store():
    with app.app_context():
        logging.info("--- INICIANDO CICLO DE CAPTURA ---")
        feeds_to_process = []
        try:
            with get_conn() as conn:
                with conn.cursor(cursor_factory=psycopg2.extras.DictCursor) as cursor:
                    logging.info("Paso 1: Obteniendo lista de feeds...")
                    cursor.execute("SELECT id, url, categoria_id, pais_id, last_etag, last_modified FROM feeds WHERE activo = TRUE")
                    feeds_to_process = cursor.fetchall()
                    logging.info(f"Paso 2: {len(feeds_to_process)} feeds para procesar.")
        except psycopg2.Error as db_err:
            logging.error(f"Error de BD al obtener feeds: {db_err}")
            return

        if not feeds_to_process:
            logging.info("No hay feeds activos para procesar.")
            return

        feeds_fallidos, feeds_exitosos, todas_las_noticias, feeds_para_actualizar_headers = [], [], [], []
        logging.info(f"Paso 3: Iniciando procesamiento paralelo ({MAX_WORKERS} workers)...")

        with ThreadPoolExecutor(max_workers=MAX_WORKERS) as executor:
            future_to_feed = {executor.submit(process_single_feed, dict(feed)): feed for feed in feeds_to_process}
            progress_bar = tqdm(as_completed(future_to_feed), total=len(feeds_to_process), desc="Procesando Feeds")
            for future in progress_bar:
                original_feed_data = future_to_feed[future]
                feed_id = original_feed_data['id']
                try:
                    _, noticias_encontradas, new_etag, new_modified, success = future.result(timeout=SINGLE_FEED_TIMEOUT)
                    if success:
                        feeds_exitosos.append(feed_id)
                        if noticias_encontradas: todas_las_noticias.extend(noticias_encontradas)
                        if (new_etag is not None and new_etag != original_feed_data.get('last_etag')) or \
                           (new_modified is not None and new_modified != original_feed_data.get('last_modified')):
                            feeds_para_actualizar_headers.append({'id': feed_id, 'etag': new_etag, 'modified': new_modified})
                    else:
                        feeds_fallidos.append(feed_id)
                except TimeoutError:
                    logging.error(f"!!! TIMEOUT en feed {original_feed_data['url']} (ID: {feed_id})")
                    feeds_fallidos.append(feed_id)
                except Exception as exc:
                    logging.error(f"Excepción en feed {original_feed_data['url']} (ID: {feed_id}): {exc}", exc_info=True)
                    feeds_fallidos.append(feed_id)

        logging.info(f"Paso 4: Procesamiento finalizado. Noticias nuevas: {len(todas_las_noticias)}, Feeds fallidos: {len(feeds_fallidos)}, Feeds actualizados: {len(feeds_para_actualizar_headers)}.")
        if not any([todas_las_noticias, feeds_fallidos, feeds_exitosos, feeds_para_actualizar_headers]):
            logging.info("Sin cambios que aplicar en la base de datos.")
            return

        try:
            with get_conn() as conn:
                logging.info("Paso 5: Actualizando BD...")

                if feeds_fallidos or feeds_exitosos:
                    with conn.cursor() as cursor_feeds_status:
                        if feeds_fallidos:
                            cursor_feeds_status.execute("UPDATE feeds SET fallos = fallos + 1 WHERE id IN %s", (tuple(feeds_fallidos),))
                            cursor_feeds_status.execute("UPDATE feeds SET activo = FALSE WHERE fallos >= %s AND id IN %s", (MAX_FALLOS, tuple(feeds_fallidos)))
                        if feeds_exitosos:
                            cursor_feeds_status.execute("UPDATE feeds SET fallos = 0 WHERE id IN %s", (tuple(feeds_exitosos),))

                if feeds_para_actualizar_headers:
                    with conn.cursor() as cursor_headers:
                        psycopg2.extras.execute_values(
                            cursor_headers,
                            "UPDATE feeds SET last_etag = data.etag, last_modified = data.modified FROM (VALUES %s) AS data(id, etag, modified) WHERE feeds.id = data.id",
                            [(f['id'], f['etag'], f['modified']) for f in feeds_para_actualizar_headers]
                        )

                if todas_las_noticias:
                    logging.info(f"Intentando insertar {len(todas_las_noticias)} noticias en la base de datos.")
                    with conn.cursor() as cursor_news_insert:
                        psycopg2.extras.execute_values(
                            cursor_news_insert,
                            "INSERT INTO noticias (id, titulo, resumen, url, fecha, imagen_url, categoria_id, pais_id) VALUES %s ON CONFLICT (id) DO NOTHING",
                            todas_las_noticias
                        )
                        rows_inserted = cursor_news_insert.rowcount
                        logging.info(f"Se insertaron/omitieron {rows_inserted} noticias (ON CONFLICT DO NOTHING).")

                logging.info("--- CICLO DE CAPTURA FINALIZADO ---")
        except psycopg2.Error as db_err:
            logging.error(f"Error de BD en actualización masiva: {db_err}", exc_info=True)


if __name__ == "__main__":
    if not db_pool:
        app.logger.error("La aplicación no puede arrancar sin una conexión a la base de datos.")
        sys.exit(1)
    app.run(host="0.0.0.0", port=5000, debug=True)