"""CD-Ripping via abcde with interactive multi-disc workflow."""

from __future__ import annotations

import logging
import re
import subprocess
from pathlib import Path
from typing import NamedTuple

from pydantic import BaseModel

from musiksammlung.config import AudioFormat

logger = logging.getLogger(__name__)

# ANSI escape sequence pattern (e.g. arrow keys from broken readline)
_ANSI_ESC = re.compile(r"(\x1b|\^)\[[\d;]*[A-Za-z@]?")


class TrackInfo(NamedTuple):
    """Track information from abcde."""

    track_number: int
    artist: str
    title: str


class RipperConfig(BaseModel):
    """Configuration for ripping process."""

    device: str = "/dev/cdrom"
    audio_format: AudioFormat = AudioFormat.FLAC
    output_dir: Path = Path("temp")
    quality: str = "medium"  # low, medium, high
    parallel_jobs: int = 1  # Number of parallel encoder processes
    use_pipes: bool = False  # True = faster, no WAV files
    use_cddb: bool = True  # Use CDDB lookup


def _clean_input(raw: str) -> str:
    """Strip ANSI escape codes, control characters and surrounding quotes.

    Handles broken readline environments where arrow keys produce
    literal escape sequences like ^[[D instead of moving the cursor.

    Args:
        raw: Raw string from input()

    Returns:
        Cleaned string
    """
    # Remove ANSI escape sequences (\x1b[... and ^[[...)
    cleaned = _ANSI_ESC.sub("", raw)
    # Remove remaining control characters (backspace \x08, etc.)
    cleaned = re.sub(r"[\x00-\x1f\x7f]", "", cleaned)
    # Strip surrounding whitespace and quotes
    cleaned = cleaned.strip().strip('"\'')
    return cleaned


def _sanitize_name(name: str) -> str:
    """Remove problematic characters and replace spaces.

    Args:
        name: Original name

    Returns:
        Cleaned name (spaces -> underscores)
    """
    # Replace spaces with underscores
    name = name.replace(" ", "_")
    # Keep umlauts and special characters
    # Only remove problematic filename characters
    name = re.sub(r'[<>:"/\\|?*]', "", name)
    # Remove leading/trailing underscores
    name = name.strip("_")
    return name


def _parse_cddb_response(output: str) -> list[TrackInfo]:
    """Parse CDDB data from abcde output.

    Args:
        output: abcde stdout/stderr output

    Returns:
        List of track information
    """
    tracks = []
    # Pattern: "N: Artist - Title"
    pattern = re.compile(r"^\s*(\d+):\s*(.+?)\s*-\s*(.+)$")

    for line in output.split("\n"):
        match = pattern.match(line)
        if match:
            track_num = int(match.group(1))
            artist = match.group(2).strip()
            title = match.group(3).strip()
            tracks.append(TrackInfo(track_num, artist, title))

    return tracks


def _get_audio_files(output_dir: Path, audio_format: AudioFormat) -> list[Path]:
    """Find all audio files in directory recursively (case-insensitive).

    Args:
        output_dir: Target directory
        audio_format: Audio format

    Returns:
        Sorted list of found files
    """
    # Regex pattern for case-insensitive search
    ext = audio_format.extension.lstrip(".")
    pattern = re.compile(rf".*\.{ext}$", re.IGNORECASE)

    audio_files = []
    # rglob: search recursively so abcde subdirs are also covered
    for file in output_dir.rglob("*"):
        if file.is_file() and pattern.match(file.name):
            audio_files.append(file)

    return sorted(audio_files)


def _write_abcde_config(output_dir: Path) -> Path:
    """Write a temporary abcde config file.

    Sets OUTPUTDIR to output_dir and uses a flat filename format
    (track number only) so we can rename files ourselves afterward.

    Args:
        output_dir: Directory where encoded files should be placed

    Returns:
        Path to the config file
    """
    config = f"""\
OUTPUTDIR="{output_dir}"
OUTPUTFORMAT="${{TRACKNUM}}"
VAOUTPUTFORMAT="${{TRACKNUM}}"
ONETRACKOUTPUTFORMAT="${{TRACKNUM}}"
PLAYLISTFORMAT=""
"""
    config_path = output_dir / ".abcde.conf"
    config_path.write_text(config, encoding="utf-8")
    return config_path


def _rename_files(
    output_dir: Path,
    tracks: list[TrackInfo],
    audio_format: AudioFormat,
) -> None:
    """Rename files according to naming scheme.

    Format: <two-digit track_number>_-_title_-_artist.extension

    Args:
        output_dir: Directory with files
        tracks: Track information
        audio_format: Audio format
    """
    audio_files = _get_audio_files(output_dir, audio_format)

    # Pattern for abcde filenames: 01, 02, ..., 10, 11, ...
    abcde_pattern = re.compile(r"^(\d+)\.")

    for track in tracks:
        # Find matching file
        for file in audio_files:
            match = abcde_pattern.match(file.name)
            if match and int(match.group(1)) == track.track_number:
                # New name: <two-digit track_number>_-_title_-_artist.extension
                track_num_padded = f"{track.track_number:02d}"
                artist_clean = _sanitize_name(track.artist)
                title_clean = _sanitize_name(track.title)
                new_name = (
                    f"{track_num_padded}_-_{title_clean}_-_"
                    f"{artist_clean}{audio_format.extension}"
                )

                new_path = output_dir / new_name

                if file != new_path:
                    logger.info("Renaming: %s -> %s", file.name, new_name)
                    file.rename(new_path)
                break


def _rip_with_abcde(
    device: str,
    output_dir: Path,
    audio_format: AudioFormat,
    quality: str = "medium",
    parallel_jobs: int = 1,
    use_pipes: bool = False,
    use_cddb: bool = True,
) -> tuple[list[Path], list[TrackInfo] | None]:
    """Rip a CD with abcde directly to desired format.

    Args:
        device: CD drive, e.g. '/dev/cdrom'
        output_dir: Target directory for files
        audio_format: Output audio format
        quality: Quality setting (low, medium, high)
        parallel_jobs: Number of parallel encoder processes
        use_pipes: True = faster, no WAV files
        use_cddb: True = use CDDB lookup

    Returns:
        Tuple (list of created files, track information or None)
    """
    output_dir.mkdir(parents=True, exist_ok=True)

    # Write abcde config: controls OUTPUTDIR and flat filename format
    config_path = _write_abcde_config(output_dir)

    # abcde options:
    # -c config: use our config (OUTPUTDIR, OUTPUTFORMAT)
    # -a actions: cddb+read+encode+tag+move, or read+encode+move
    # -p: pad track numbers with zeros
    # -o format: output format
    # -d device: CD drive
    # -x: eject CD after ripping
    # -N: non-interactive (no prompts, auto-select first CDDB match)
    cmd = [
        "abcde",
        "-c", str(config_path),
        "-p",
        "-o", audio_format.get_abcde_format(),
        "-d", device,
        "-x",
        "-N",
    ]

    # Actions — move is required so files land in OUTPUTDIR
    if use_cddb:
        cmd.extend(["-a", "cddb,read,encode,tag,move"])
    else:
        cmd.extend(["-a", "read,encode,move"])

    # Parallel encodes
    if parallel_jobs > 1:
        cmd.extend(["-j", str(parallel_jobs)])

    # Use pipes
    if use_pipes:
        cmd.append("-P")

    # Encoder options for quality
    encoder_opts = audio_format.get_encoder_options(quality)
    if encoder_opts:
        # abcde accepts encoder options with colon: -o format:options
        cmd[-2] = f"{audio_format.get_abcde_format()}:{encoder_opts}"

    logger.info(
        "Starting abcde in %s (Format: %s, Quality: %s, CDDB: %s)",
        output_dir, audio_format.value, quality, use_cddb,
    )
    logger.debug("Command: %s", " ".join(cmd))

    # Run abcde non-interactively, capture output for CDDB parsing
    result = subprocess.run(
        cmd,
        cwd=str(output_dir),
        capture_output=True,
        text=True,
    )

    # Log output for debugging
    if result.stdout:
        logger.debug("abcde stdout:\n%s", result.stdout)
    if result.stderr:
        logger.debug("abcde stderr:\n%s", result.stderr)

    if result.returncode != 0:
        raise RuntimeError(
            f"abcde failed (exit {result.returncode}).\n"
            f"{result.stderr or result.stdout}"
        )

    # Parse track info from CDDB output
    tracks = None
    if use_cddb:
        combined = result.stdout + result.stderr
        tracks = _parse_cddb_response(combined)
        if tracks:
            logger.info("CDDB data found: %d tracks", len(tracks))

    # Find files (case-insensitive, recursive)
    audio_files = _get_audio_files(output_dir, audio_format)

    if not audio_files:
        raise RuntimeError(
            "No audio files found after ripping.\n"
            "abcde output:\n" + (result.stderr or result.stdout)
        )

    logger.info("Ripping completed: %d tracks in %s", len(audio_files), output_dir)
    return audio_files, tracks


def rip_disc(
    device: str,
    output_dir: Path,
    audio_format: AudioFormat = AudioFormat.FLAC,
    quality: str = "medium",
    parallel_jobs: int = 1,
    use_pipes: bool = False,
    use_cddb: bool = True,
) -> tuple[Path, str | None, list[TrackInfo] | None]:
    """Rip a CD directly to the desired format.

    Args:
        device: CD drive, e.g. '/dev/cdrom'
        output_dir: Target directory for files
        audio_format: Output audio format
        quality: Quality setting (low, medium, high)
        parallel_jobs: Number of parallel encoder processes
        use_pipes: True = faster, no WAV files
        use_cddb: True = use CDDB lookup

    Returns:
        Tuple (directory path, album name or None, track information or None)
    """
    _, tracks = _rip_with_abcde(
        device, output_dir, audio_format, quality, parallel_jobs, use_pipes, use_cddb
    )

    album_name = None
    if tracks:
        album_name = tracks[0].artist
        _rename_files(output_dir, tracks, audio_format)

    return output_dir, album_name, tracks


def interactive_rip(config: RipperConfig) -> None:
    """Interactive rip workflow for multiple CDs.

    Files are placed under config.output_dir:
      Album_Name/CD1/01_-_title_-_artist.flac, ...

    Args:
        config: Ripper configuration
    """
    print("\n" + "=" * 60)
    print("  Musiksammlung - Interactive CD Ripper (abcde)")
    print("=" * 60)
    print(f"\nCD Drive:          {config.device}")
    print(f"Audio Format:      {config.audio_format.value}")
    print(f"Quality:           {config.quality}")
    print(f"CDDB Lookup:       {config.use_cddb}")
    print(f"Parallel Encodes:  {config.parallel_jobs}")
    print(f"Pipes:             {config.use_pipes}")
    print(f"Output Directory:  {config.output_dir.absolute()}")
    print("\nNote: Do not use arrow keys while typing — press Enter to confirm.\n")

    album_counter = 1

    while True:
        print(f"\n--- Album {album_counter} ---")

        raw = input("Album name (Enter = CDDB name / default 'Album{N}'): ")
        album_name = _clean_input(raw)
        if not album_name:
            album_name = f"Album{album_counter}"

        disc_counter = 1

        while True:
            print(f"\n  Album:    {album_name}")
            print(f"  CD Drive: {config.device}")

            raw_disc = input("  CD number [1]: ")
            disc_num = int(_clean_input(raw_disc)) if _clean_input(raw_disc) else 1

            disc_dir = (
                config.output_dir
                / _sanitize_name(album_name)
                / f"CD{disc_num}"
            )

            print(f"  Ripping to: {disc_dir.relative_to(config.output_dir)}")
            print("  (Ripping in progress, please wait...)")

            try:
                _, detected_album, tracks = rip_disc(
                    device=config.device,
                    output_dir=disc_dir,
                    audio_format=config.audio_format,
                    quality=config.quality,
                    parallel_jobs=config.parallel_jobs,
                    use_pipes=config.use_pipes,
                    use_cddb=config.use_cddb,
                )

                if tracks:
                    print(f"  ✓ CD {disc_num} ripped successfully — {len(tracks)} tracks")
                    first = tracks[0]
                    last = tracks[-1]
                    print(f"    {first.track_number:2d}. {first.title} — {first.artist}")
                    if last != first:
                        print(f"    {last.track_number:2d}. {last.title} — {last.artist}")
                else:
                    print(f"  ✓ CD {disc_num} ripped successfully")

            except RuntimeError as e:
                print(f"  ✗ Ripping error: {e}")
                raw_retry = input("  Try again? (y/n): ")
                if _clean_input(raw_retry).lower() != "y":
                    print("  Aborting disc.")
                    break
                continue

            raw_next = input("  Next CD for this album? (y/n): ")
            if _clean_input(raw_next).lower() != "y":
                break

            disc_counter += 1

        raw_album = input("\nNext album? (y/n): ")
        if _clean_input(raw_album).lower() != "y":
            break

        album_counter += 1

    print("\n" + "=" * 60)
    print("Ripping completed!")
    print(f"Files are in: {config.output_dir.absolute()}")
    print("\nNext steps:")
    print("  1. Check filenames and tags")
    if config.use_cddb:
        print("  2. Adjust tags/covers with 'musiksammlung apply'")
    else:
        print("  2. Run 'musiksammlung scan' to extract metadata")
        print("  3. Run 'musiksammlung apply' to organize & tag")
    print("=" * 60 + "\n")