import os
import subprocess
import shutil
from pathlib import Path
from typing import List, Dict, Optional
import numpy as np

class AssetProcessor:
    """Base class for all asset-level transformations (ImageMagick, Inkscape, etc.)."""
    
    def __init__(self, name: str):
        self.name = name
        self.available = self._check_availability()

    def _check_availability(self) -> bool:
        return shutil.which(self.name.lower()) is not None

    def process(self, input_path: Path, output_path: Path, options: Dict = None) -> bool:
        """Process a single asset."""
        raise NotImplementedError("Subclasses must implement process()")

class ImageMagickProcessor(AssetProcessor):
    def __init__(self):
        # On Linux it's often 'magick' or 'convert'
        name = "magick" if shutil.which("magick") else "convert"
        super().__init__(name)

    def process(self, input_path: Path, output_path: Path, options: Dict = None) -> bool:
        if not self.available:
            return False
        
        # Example options: {"filters": "-sepia-tone 80% -charcoal 2"}
        filters = options.get("filters", "").split() if options else []
        cmd = [self.name, str(input_path)] + filters + [str(output_path)]
        
        try:
            subprocess.run(cmd, check=True, capture_output=True)
            return True
        except Exception as e:
            print(f"   [AssetProcessor] ImageMagick error: {e}")
            return False

class InkscapeProcessor(AssetProcessor):
    def __init__(self):
        super().__init__("inkscape")

    def process(self, input_path: Path, output_path: Path, options: Dict = None) -> bool:
        if not self.available:
            return False
        
        # Export SVG to PNG
        cmd = [self.name, "--export-type=png", "--export-filename=" + str(output_path), str(input_path)]
        
        try:
            subprocess.run(cmd, check=True, capture_output=True)
            return True
        except Exception as e:
            print(f"   [AssetProcessor] Inkscape error: {e}")
            return False

class AsepriteProcessor(AssetProcessor):
    def __init__(self):
        super().__init__("aseprite")

    def process(self, input_path: Path, output_path: Path, options: Dict = None) -> bool:
        if not self.available:
            return False
        
        # Example: Pixel art conversion
        # aseprite -b input.png --save-as output.png
        cmd = [self.name, "-b", str(input_path), "--save-as", str(output_path)]
        
        try:
            subprocess.run(cmd, check=True, capture_output=True)
            return True
        except Exception as e:
            print(f"   [AssetProcessor] Aseprite error: {e}")
            return False

class OpenCVAssetProcessor(AssetProcessor):
    """Bridge to VFXProcessor for static asset processing."""
    def __init__(self):
        super().__init__("python") # Uses python/cv2
        try:
            import cv2
            self.available = True
        except ImportError:
            self.available = False

    def process(self, input_path: Path, output_path: Path, options: Dict = None) -> bool:
        if not self.available: return False
        try:
            import cv2
            from vfx.opencv_effects import VFXProcessor
            
            img = cv2.imread(str(input_path))
            if img is None: return False
            
            # Convert BGR to RGB for VFXProcessor
            img_rgb = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
            
            profile = options.get("profile", "none")
            vfx = VFXProcessor(profile)
            processed_rgb = vfx.process_frame(img_rgb, 0.0)
            
            # Convert back to BGR for saving
            processed_bgr = cv2.cvtColor(processed_rgb, cv2.COLOR_RGB2BGR)
            cv2.imwrite(str(output_path), processed_bgr)
            return True
        except Exception as e:
            print(f"   [AssetProcessor] OpenCV error: {e}")
            return False

def get_processor(name: str) -> Optional[AssetProcessor]:
    processors = {
        "imagemagick": ImageMagickProcessor,
        "inkscape": InkscapeProcessor,
        "aseprite": AsepriteProcessor,
        "opencv": OpenCVAssetProcessor
    }
    cls = processors.get(name.lower())
    return cls() if cls else None

def apply_artistic_profile(story_dir: Path, profile_name: str):
    """
    Applies an artistic profile to all images in a story directory.
    Profiles: 'pixel_art', 'sketch', 'watercolor', 'vhs_static'
    """
    img_dir = story_dir / "assets" / "images"
    if not img_dir.exists(): return

    output_dir = story_dir / "assets" / "images_processed"

    if profile_name == "none":
        if output_dir.exists():
            print(f"   🧹 Profil 'none' demandé : suppression des images processées.")
            shutil.rmtree(output_dir)
        return

    output_dir.mkdir(exist_ok=True)

    # --- CACHE CHECK ---
    cache_file = output_dir / ".last_profile"
    if cache_file.exists():
        try:
            last_profile = cache_file.read_text().strip()
            # If profile is same and some images exist, skip
            if last_profile == profile_name and any(output_dir.glob("scene_*.png")):
                print(f"   ✨ Profil '{profile_name}' déjà appliqué. On saute le re-processing.")
                return
        except: pass

    processor = None
    options = {}
    # ... (rest of the logic remains)

    if profile_name == "pixel_art":
        processor = get_processor("aseprite")
    elif profile_name == "sketch":
        processor = get_processor("imagemagick")
        options = {"filters": "-colorspace gray -edge 1 -negate"}
    elif profile_name == "oil_paint":
        processor = get_processor("imagemagick")
        options = {"filters": "-paint 3"}
    elif profile_name == "charcoal":
        processor = get_processor("imagemagick")
        options = {"filters": "-charcoal 2"}
    elif profile_name == "vintage":
        processor = get_processor("imagemagick")
        options = {"filters": "-sepia-tone 80%"}
    elif profile_name == "night_vision":
        processor = get_processor("imagemagick")
        options = {"filters": "-colorspace gray -fill #00ff00 -tint 100"}
    elif profile_name == "vhs_static":
        processor = get_processor("opencv")
        options = {"profile": "vhs_pro"}
    
    if not processor or not processor.available:
        print(f"   [AssetProcessor] Profile '{profile_name}' not available (tool missing).")
        return

    print(f"   🎨 Applying Artistic Profile: {profile_name}...")
    processed_count = 0
    for img_path in img_dir.glob("scene_*.png"):
        out_path = output_dir / img_path.name
        if processor.process(img_path, out_path, options):
            processed_count += 1
            
    # Save to cache if at least one image was processed
    if processed_count > 0:
        cache_file.write_text(profile_name)