import subprocess
import os
from pathlib import Path
from typing import Callable, Dict, Any
import shutil
import traceback


# Find FFmpeg
ffmpeg_path = shutil.which("ffmpeg") or shutil.which("ffmpeg.exe")

if not ffmpeg_path:

    common_paths = [
        r"C:\ffmpeg\bin\ffmpeg.exe",
        r"C:\Program Files\ffmpeg\bin\ffmpeg.exe",
    ]

    for path in common_paths:
        if os.path.exists(path):
            ffmpeg_path = path
            break


class VideoConverter:

    SUPPORTED_FORMATS = {
        ".mp4",
        ".avi",
        ".mkv",
        ".mov",
        ".webm",
        ".gif"
    }

    def __init__(self):

        self.ffmpeg_available = self._check_ffmpeg()

    def _check_ffmpeg(self):

        if not ffmpeg_path or not os.path.exists(ffmpeg_path):

            print("⚠ FFmpeg not found")

            return False

        return True

    def convert(
        self,
        input_path: str,
        output_path: str,
        options: Dict[str, Any] | None = None,
        progress_callback: Callable = None
    ) -> bool:

        options = options or {}

        try:

            if not self.ffmpeg_available:
                print("FFmpeg not available")
                return False

            self._update_progress(progress_callback, 10)

            # Validate input
            if not os.path.exists(input_path):
                raise FileNotFoundError(input_path)

            input_ext = Path(input_path).suffix.lower()
            output_ext = Path(output_path).suffix.lower()

            if output_ext not in self.SUPPORTED_FORMATS:
                raise ValueError(
                    f"Unsupported format: {output_ext}"
                )

            # Create output directory
            Path(output_path).parent.mkdir(
                parents=True,
                exist_ok=True
            )

            self._update_progress(progress_callback, 20)

            # Quality settings
            quality_settings = options.get(
                "quality_settings",
                {}
            )

            crf_value = str(
                quality_settings.get("video", "23")
            )

            # Base command
            cmd = [
                ffmpeg_path,
                "-y",
                "-i",
                input_path
            ]

            # Video filters
            video_filters = []

            # AI enhancement
            if options.get("ai_enhancement", False):

                video_filters.append(
                    "unsharp=5:5:1.0:5:5:0.0"
                )

            # Format settings
            if output_ext == ".mp4":

                cmd.extend([
                    "-c:v", "libx264",
                    "-preset", "medium",
                    "-crf", crf_value,
                    "-c:a", "aac",
                    "-b:a", "128k"
                ])

            elif output_ext == ".avi":

                cmd.extend([
                    "-c:v", "libxvid",
                    "-q:v", "4",
                    "-c:a", "mp3",
                    "-b:a", "192k"
                ])

            elif output_ext == ".mkv":

                cmd.extend([
                    "-c:v", "libx264",
                    "-crf", crf_value,
                    "-c:a", "aac"
                ])

            elif output_ext == ".mov":

                cmd.extend([
                    "-c:v", "libx264",
                    "-pix_fmt", "yuv420p",
                    "-c:a", "aac"
                ])

            elif output_ext == ".webm":

                cmd.extend([
                    "-c:v", "libvpx-vp9",
                    "-crf", crf_value,
                    "-b:v", "0",
                    "-c:a", "libopus"
                ])

            elif output_ext == ".gif":

                video_filters.append(
                    "fps=10,scale=320:-1:flags=lanczos"
                )

                cmd.extend([
                    "-loop", "0"
                ])

            # Apply filters safely
            if video_filters:

                cmd.extend([
                    "-vf",
                    ",".join(video_filters)
                ])

            self._update_progress(progress_callback, 50)

            # Output path
            cmd.append(output_path)

            # Run ffmpeg
            result = subprocess.run(
                cmd,
                capture_output=True,
                text=True,
                timeout=600
            )

            self._update_progress(progress_callback, 90)

            if result.returncode != 0:

                print("FFmpeg Error:")
                print(result.stderr[:500])

                return False

            self._update_progress(progress_callback, 100)

            print(
                f"✓ Converted: "
                f"{os.path.basename(input_path)} "
                f"→ {output_ext}"
            )

            return True

        except subprocess.TimeoutExpired:

            print("Video conversion timed out")

            return False

        except Exception as e:

            print(
                f"Video conversion error: {e}"
            )

            traceback.print_exc()

            return False

    def _update_progress(
        self,
        callback,
        value
    ):

        try:

            if callback:
                callback(value)

        except Exception as e:

            print(
                f"Progress callback error: {e}"
            )