"""Repositorio para gestionar jobs."""

from typing import Optional, List
from datetime import datetime
from dataclasses import dataclass
import uuid
from .database import db
from ..constants import JobStatus


@dataclass
class Job:
    """Modelo de Job."""
    job_id: str
    created_at: str
    updated_at: str
    source_path: str
    source_name: str
    source_hash: Optional[str]
    node_name: Optional[str]
    db_name: Optional[str]
    status: str
    attempts: int
    last_error: Optional[str]
    started_at: Optional[str]
    finished_at: Optional[str]
    total_ms: Optional[int]
    extract_ms: Optional[int]
    restore_ms: Optional[int]
    filelist_ms: Optional[int]


class JobRepository:
    """Repositorio para operaciones con jobs."""
    
    @staticmethod
    def create(source_path: str, source_name: str, source_hash: str) -> str:
        """
        Crea un nuevo job.
        
        Args:
            source_path: Ruta completa del archivo fuente
            source_name: Nombre del archivo
            source_hash: Hash del archivo
        
        Returns:
            job_id del job creado
        """
        job_id = str(uuid.uuid4())
        now = datetime.utcnow().isoformat()
        
        db.execute("""
            INSERT INTO jobs (
                job_id, created_at, updated_at, source_path, source_name, 
                source_hash, status, attempts
            ) VALUES (?, ?, ?, ?, ?, ?, ?, ?)
        """, (job_id, now, now, source_path, source_name, source_hash, JobStatus.QUEUED, 0))
        
        return job_id
    
    @staticmethod
    def get(job_id: str) -> Optional[Job]:
        """Obtiene un job por ID."""
        row = db.fetchone("SELECT * FROM jobs WHERE job_id = ?", (job_id,))
        if not row:
            return None
        return Job(**dict(row))
    
    @staticmethod
    def get_all(
        status: Optional[str] = None,
        limit: Optional[int] = None,
        offset: int = 0
    ) -> List[Job]:
        """
        Obtiene todos los jobs con filtros opcionales.
        
        Args:
            status: Filtrar por estado
            limit: Límite de resultados
            offset: Desplazamiento
        
        Returns:
            Lista de jobs
        """
        query = "SELECT * FROM jobs"
        params = []
        
        if status:
            query += " WHERE status = ?"
            params.append(status)
        
        query += " ORDER BY created_at DESC"
        
        if limit:
            query += f" LIMIT {limit} OFFSET {offset}"
        
        rows = db.fetchall(query, tuple(params))
        return [Job(**dict(row)) for row in rows]
    
    @staticmethod
    def update_status(
        job_id: str,
        status: str,
        error: Optional[str] = None,
        increment_attempts: bool = False
    ):
        """Actualiza el estado de un job."""
        now = datetime.utcnow().isoformat()
        
        updates = ["status = ?", "updated_at = ?"]
        params = [status, now]
        
        if error is not None:
            updates.append("last_error = ?")
            params.append(error)
        
        if increment_attempts:
            updates.append("attempts = attempts + 1")
        
        if status == JobStatus.EXTRACTING and not db.fetchone(
            "SELECT started_at FROM jobs WHERE job_id = ?", (job_id,)
        )["started_at"]:
            updates.append("started_at = ?")
            params.append(now)
        
        if status in [JobStatus.COMPLETED, JobStatus.FAILED, JobStatus.CANCELLED]:
            updates.append("finished_at = ?")
            params.append(now)
        
        params.append(job_id)
        
        db.execute(
            f"UPDATE jobs SET {', '.join(updates)} WHERE job_id = ?",
            tuple(params)
        )
    
    @staticmethod
    def update_node_and_db(job_id: str, node_name: str, db_name: str):
        """Actualiza el nodo y base de datos de un job."""
        now = datetime.utcnow().isoformat()
        db.execute(
            "UPDATE jobs SET node_name = ?, db_name = ?, updated_at = ? WHERE job_id = ?",
            (node_name, db_name, now, job_id)
        )
    
    @staticmethod
    def update_timing(
        job_id: str,
        total_ms: Optional[int] = None,
        extract_ms: Optional[int] = None,
        restore_ms: Optional[int] = None,
        filelist_ms: Optional[int] = None
    ):
        """Actualiza los tiempos de ejecución."""
        updates = []
        params = []
        
        if total_ms is not None:
            updates.append("total_ms = ?")
            params.append(total_ms)
        if extract_ms is not None:
            updates.append("extract_ms = ?")
            params.append(extract_ms)
        if restore_ms is not None:
            updates.append("restore_ms = ?")
            params.append(restore_ms)
        if filelist_ms is not None:
            updates.append("filelist_ms = ?")
            params.append(filelist_ms)
        
        if updates:
            params.append(job_id)
            db.execute(
                f"UPDATE jobs SET {', '.join(updates)} WHERE job_id = ?",
                tuple(params)
            )
    
    @staticmethod
    def exists_by_hash(source_hash: str) -> bool:
        """Verifica si existe un job con el hash dado."""
        row = db.fetchone(
            "SELECT COUNT(*) as count FROM jobs WHERE source_hash = ?",
            (source_hash,)
        )
        return row["count"] > 0
    
    @staticmethod
    def get_stats() -> dict:
        """Obtiene estadísticas de jobs."""
        stats = {
            "total": 0,
            "queued": 0,
            "running": 0,
            "completed": 0,
            "failed": 0
        }
        
        rows = db.fetchall("SELECT status, COUNT(*) as count FROM jobs GROUP BY status")
        for row in rows:
            status = row["status"]
            count = row["count"]
            stats["total"] += count
            
            if status == JobStatus.QUEUED:
                stats["queued"] = count
            elif status in [JobStatus.EXTRACTING, JobStatus.RESTORING, JobStatus.CLEANING]:
                stats["running"] += count
            elif status == JobStatus.COMPLETED:
                stats["completed"] = count
            elif status in [JobStatus.FAILED, JobStatus.FAILED_RESTART, JobStatus.CANCELLED]:
                stats["failed"] += count
        
        return stats
    
    @staticmethod
    def get_average_times() -> dict:
        """Obtiene tiempos promedio de ejecución."""
        row = db.fetchone("""
            SELECT 
                AVG(total_ms) as avg_total,
                AVG(extract_ms) as avg_extract,
                AVG(restore_ms) as avg_restore
            FROM jobs 
            WHERE status = ? AND total_ms IS NOT NULL
        """, (JobStatus.COMPLETED,))
        
        return {
            "total_ms": int(row["avg_total"] or 0),
            "extract_ms": int(row["avg_extract"] or 0),
            "restore_ms": int(row["avg_restore"] or 0)
        }