"""
Tareas de gestión de memoria de contenido.

Incluye:
- Actualización periódica de engagement scores
- Marcado de top performers
- Sincronización de métricas desde posts
- Limpieza de memoria antigua
"""

import logging
from datetime import datetime, timedelta
from typing import Optional

from worker.celery_app import celery_app
from app.core.database import SessionLocal
from app.models.post import Post
from app.models.post_metrics import PostMetrics
from app.models.content_memory import ContentMemory

logger = logging.getLogger(__name__)


@celery_app.task(name="worker.tasks.content_memory.update_engagement_scores")
def update_engagement_scores():
    """
    Actualizar scores de engagement basado en métricas reales.

    Esta tarea:
    1. Obtiene métricas recientes de posts
    2. Calcula engagement score normalizado
    3. Actualiza ContentMemory
    4. Marca top performers

    Se ejecuta cada 6 horas.
    """
    db = SessionLocal()

    try:
        updated_count = 0
        new_top_performers = 0

        # Obtener posts con métricas que tengan ContentMemory
        memories = db.query(ContentMemory).filter(
            ContentMemory.created_at >= datetime.utcnow() - timedelta(days=90)
        ).all()

        for memory in memories:
            # Obtener el post asociado
            post = db.query(Post).filter(Post.id == memory.post_id).first()
            if not post or not post.metrics:
                continue

            # Calcular engagement score
            metrics = post.metrics
            old_score = memory.engagement_score

            memory.update_engagement(metrics)
            updated_count += 1

            # Logging si cambió significativamente
            if old_score and abs((memory.engagement_score or 0) - old_score) > 10:
                logger.info(
                    f"Post {post.id} engagement cambió: {old_score:.1f} -> {memory.engagement_score:.1f}"
                )

        db.commit()

        # Recalcular top performers
        new_top_performers = _recalculate_top_performers(db)

        logger.info(
            f"Engagement actualizado: {updated_count} posts, "
            f"{new_top_performers} nuevos top performers"
        )

        return {
            "updated": updated_count,
            "new_top_performers": new_top_performers
        }

    except Exception as e:
        logger.error(f"Error actualizando engagement: {e}")
        db.rollback()
        raise

    finally:
        db.close()


def _recalculate_top_performers(db, top_percentile: int = 20) -> int:
    """
    Recalcular qué posts son top performers.

    Args:
        db: Sesión de DB
        top_percentile: Percentil para considerar top performer

    Returns:
        Número de nuevos top performers marcados
    """
    # Obtener todos los scores
    all_scores = db.query(ContentMemory.engagement_score).filter(
        ContentMemory.engagement_score.isnot(None)
    ).all()

    if not all_scores:
        return 0

    scores = sorted([s[0] for s in all_scores], reverse=True)

    # Calcular umbral
    threshold_idx = max(0, int(len(scores) * top_percentile / 100) - 1)
    threshold_score = scores[threshold_idx]

    # Marcar nuevos top performers
    new_tops = db.query(ContentMemory).filter(
        ContentMemory.engagement_score >= threshold_score,
        ContentMemory.is_top_performer == False
    ).update({"is_top_performer": True})

    # Desmarcar los que ya no califican
    db.query(ContentMemory).filter(
        ContentMemory.engagement_score < threshold_score,
        ContentMemory.is_top_performer == True
    ).update({"is_top_performer": False})

    db.commit()

    return new_tops


@celery_app.task(name="worker.tasks.content_memory.sync_post_metrics")
def sync_post_metrics(post_id: int):
    """
    Sincronizar métricas de un post específico a ContentMemory.

    Se llama después de obtener nuevas métricas.

    Args:
        post_id: ID del post
    """
    db = SessionLocal()

    try:
        post = db.query(Post).filter(Post.id == post_id).first()
        if not post or not post.metrics:
            return {"status": "skipped", "reason": "no_metrics"}

        memory = db.query(ContentMemory).filter(
            ContentMemory.post_id == post_id
        ).first()

        if not memory:
            return {"status": "skipped", "reason": "no_memory"}

        memory.update_engagement(post.metrics)
        db.commit()

        return {
            "status": "updated",
            "post_id": post_id,
            "engagement_score": memory.engagement_score
        }

    finally:
        db.close()


@celery_app.task(name="worker.tasks.content_memory.analyze_and_save_content")
def analyze_and_save_content(
    post_id: int,
    content: str,
    content_type: str,
    platform: str,
    quality_score: Optional[int] = None,
    quality_breakdown: Optional[dict] = None,
    template_used: Optional[str] = None,
    personality_used: Optional[str] = None
):
    """
    Analizar contenido generado y guardarlo en memoria.

    Se llama después de generar un nuevo post.

    Args:
        post_id: ID del post creado
        content: Contenido generado
        content_type: Tipo de contenido
        platform: Plataforma principal
        quality_score: Score de calidad (si se evaluó)
        quality_breakdown: Breakdown del score
        template_used: Template usado
        personality_used: Personalidad usada
    """
    db = SessionLocal()

    try:
        # Verificar que no exista ya
        existing = db.query(ContentMemory).filter(
            ContentMemory.post_id == post_id
        ).first()

        if existing:
            return {"status": "skipped", "reason": "already_exists"}

        # Importar context engine para análisis
        from app.services.ai import context_engine

        # Guardar en memoria
        memory = context_engine.save_to_memory(
            db=db,
            post_id=post_id,
            content=content,
            content_type=content_type,
            platform=platform,
            quality_score=quality_score,
            quality_breakdown=quality_breakdown,
            template_used=template_used,
            personality_used=personality_used
        )

        return {
            "status": "created",
            "memory_id": memory.id,
            "topics": memory.topics,
            "hook_type": memory.hook_type
        }

    except Exception as e:
        logger.error(f"Error guardando en memoria: {e}")
        db.rollback()
        raise

    finally:
        db.close()


@celery_app.task(name="worker.tasks.content_memory.cleanup_old_memory")
def cleanup_old_memory(days_to_keep: int = 180):
    """
    Limpiar registros de memoria antiguos.

    Mantiene top performers indefinidamente.

    Args:
        days_to_keep: Días de registros a mantener (excepto top performers)
    """
    db = SessionLocal()

    try:
        cutoff_date = datetime.utcnow() - timedelta(days=days_to_keep)

        # Eliminar registros viejos que NO son top performers
        deleted = db.query(ContentMemory).filter(
            ContentMemory.created_at < cutoff_date,
            ContentMemory.is_top_performer == False
        ).delete()

        db.commit()

        logger.info(f"Limpieza de memoria: {deleted} registros eliminados")

        return {"deleted": deleted}

    finally:
        db.close()


@celery_app.task(name="worker.tasks.content_memory.refresh_best_posts_yaml")
def refresh_best_posts_yaml():
    """
    Actualizar el archivo best_posts.yaml con top performers reales.

    Se ejecuta semanalmente para mantener ejemplos actualizados.
    """
    import yaml
    from pathlib import Path

    db = SessionLocal()

    try:
        # Obtener top performers por tipo de contenido
        content_types = ["tip_tech", "producto", "servicio"]
        examples = {}

        for content_type in content_types:
            top = db.query(ContentMemory).filter(
                ContentMemory.content_type == content_type,
                ContentMemory.is_top_performer == True
            ).order_by(
                ContentMemory.engagement_score.desc()
            ).limit(5).all()

            if top:
                examples[content_type] = []
                for mem in top:
                    post = db.query(Post).filter(Post.id == mem.post_id).first()
                    if post:
                        examples[content_type].append({
                            "content": post.content,
                            "platform": mem.platform,
                            "engagement_score": mem.engagement_score,
                            "metrics": post.metrics,
                            "analysis": {
                                "hook_type": mem.hook_type,
                                "topics": mem.topics
                            }
                        })

        if not examples:
            return {"status": "skipped", "reason": "no_top_performers"}

        # Actualizar archivo YAML
        yaml_path = Path(__file__).parent.parent.parent / "app" / "prompts" / "examples" / "best_posts.yaml"

        # Cargar archivo existente
        with open(yaml_path, "r", encoding="utf-8") as f:
            data = yaml.safe_load(f)

        # Actualizar ejemplos
        data["examples"] = examples
        data["metadata"]["last_updated"] = datetime.utcnow().isoformat()
        data["metadata"]["auto_update"] = True

        # Guardar
        with open(yaml_path, "w", encoding="utf-8") as f:
            yaml.dump(data, f, default_flow_style=False, allow_unicode=True)

        logger.info(f"best_posts.yaml actualizado con {sum(len(v) for v in examples.values())} ejemplos")

        return {
            "status": "updated",
            "examples_by_type": {k: len(v) for k, v in examples.items()}
        }

    except Exception as e:
        logger.error(f"Error actualizando best_posts.yaml: {e}")
        raise

    finally:
        db.close()