import os
import subprocess
import re
import shutil
from celery_app import celery_app


def check_handbrake_installed() -> bool:
    """Prüft, ob HandBrakeCLI installiert ist."""
    return shutil.which("HandBrakeCLI") is not None


def get_progress_from_line(line: str) -> int:
    """Extrahiert Fortschritt in Prozent aus HandBrake-Ausgabe."""
    match = re.search(r'(\d+\.\d+)%', line)
    if match:
        return int(float(match.group(1)))
    return 0


def run_handbrake(device_path: str, output_path: str) -> dict:
    """Rippt eine DVD/Blu-ray mit HandBrakeCLI."""
    if not check_handbrake_installed():
        return {
            "status": "error",
            "error": "HandBrakeCLI ist nicht installiert"
        }
    
    try:
        cmd = [
            "HandBrakeCLI",
            "--input", device_path,
            "--output", output_path,
            "--all",
            "--progress",
            "--preset", "Fast 1080p30"
        ]
        
        process = subprocess.Popen(
            cmd,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
            text=True,
            bufsize=1
        )
        
        for line in process.stdout:
            progress = get_progress_from_line(line)
            if progress > 0:
                celery_app.send_task(
                    "worker.ripping.update_progress",
                    kwargs={
                        "progress": progress,
                        "status": "ripping",
                        "message": f"Rippe Titel {progress}%"
                    }
                )
        
        process.wait()
        
        if process.returncode == 0:
            return {
                "status": "success",
                "output_path": output_path,
                "return_code": process.returncode
            }
        else:
            return {
                "status": "error",
                "error": f"HandBrake failed with code {process.returncode}",
                "return_code": process.returncode
            }
    
    except Exception as e:
        return {
            "status": "error",
            "error": str(e)
        }


def detect_disc_type(device_path: str) -> str:
    """Erkennt den Disc-Typ anhand des Gerätepfads."""
    try:
        result = subprocess.run(
            ["file", "-L", device_path],
            capture_output=True,
            text=True,
            timeout=10
        )
        
        output = result.stdout.lower()
        
        if "dvd" in output or "video_ts" in output:
            return "dvd"
        elif "bluray" in output or "bdmv" in output:
            return "bluray"
        elif "audio" in output or "cda" in output:
            return "cd"
        else:
            return "unknown"
    
    except Exception:
        return "unknown"


def check_abcde_installed() -> bool:
    """Prüft, ob abcde installiert ist."""
    return shutil.which("abcde") is not None


def check_cdparanoia_installed() -> bool:
    """Prüft, ob cdparanoia installiert ist."""
    return shutil.which("cdparanoia") is not None


@celery_app.task(bind=True, name="worker.ripping.rip_dvd")
def rip_dvd(self, device_path: str, disc_id: str) -> dict:
    """Rippt eine DVD mit HandBrake."""
    if not check_handbrake_installed():
        return {
            "status": "error",
            "error": "HandBrakeCLI ist nicht installiert"
        }
    
    output_dir = f"/output/dvd/{disc_id}"
    os.makedirs(output_dir, exist_ok=True)
    output_path = f"{output_dir}/dvd_{disc_id}.mkv"
    
    return run_handbrake(device_path, output_path)


@celery_app.task(bind=True, name="worker.ripping.rip_bluray")
def rip_bluray(self, device_path: str, disc_id: str) -> dict:
    """Rippt eine Blu-ray mit HandBrake."""
    if not check_handbrake_installed():
        return {
            "status": "error",
            "error": "HandBrakeCLI ist nicht installiert"
        }
    
    output_dir = f"/output/bluray/{disc_id}"
    os.makedirs(output_dir, exist_ok=True)
    output_path = f"{output_dir}/bluray_{disc_id}.mkv"
    
    return run_handbrake(device_path, output_path)


@celery_app.task(bind=True, name="worker.ripping.rip_cd")
def rip_cd(self, device_path: str, disc_id: str) -> dict:
    """Rippt eine CD mit abcde."""
    if not check_abcde_installed():
        return {
            "status": "error",
            "error": "abcde ist nicht installiert. Installiere abcde und cdparanoia für CD-Ripping."
        }
    
    if not check_cdparanoia_installed():
        return {
            "status": "error",
            "error": "cdparanoia ist nicht installiert. Installiere abcde und cdparanoia für CD-Ripping."
        }
    
    output_dir = f"/output/cd/{disc_id}"
    os.makedirs(output_dir, exist_ok=True)
    
    try:
        cmd = [
            "abcde",
            "-d", device_path,
            "-o", "flac",
            "-b",
            "-t", "1",
            "-a", "default",
            "-x",
            "-o", output_dir
        ]
        
        process = subprocess.Popen(
            cmd,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
            text=True,
            bufsize=1
        )
        
        for line in process.stdout:
            self.send_task(
                "worker.ripping.update_progress",
                kwargs={
                    "progress": 50,
                    "status": "ripping",
                    "message": f"Rippe CD: {line.strip()}"
                }
            )
        
        process.wait()
        
        if process.returncode == 0:
            # MusikBrainz Lookup (via abcde's post-read)
            self.send_task(
                "worker.ripping.update_progress",
                kwargs={
                    "progress": 90,
                    "status": "ripping",
                    "message": "MusikBrainz Lookup läuft..."
                }
            )
            
            return {
                "status": "success",
                "output_dir": output_dir,
                "return_code": process.returncode
            }
        else:
            return {
                "status": "error",
                "error": f"abcde failed with code {process.returncode}",
                "return_code": process.returncode
            }
    
    except Exception as e:
        return {
            "status": "error",
            "error": str(e)
        }