import json
import random
import subprocess
import math
import os
from typing import List, Dict, Any, Optional
from .utils import ASPECT, QUALITY, valid_template

class MotionProcessor:
    def __init__(self, file: str = "motion.json") -> None:
        self.file = file
        self.templates = self._load()
    
    def _load(self) -> List[Dict[str, Any]]:
        if not os.path.exists(self.file):
            return []
        
        with open(self.file, 'r', encoding='utf-8') as f:
            data = json.load(f)
        
        return [t for t in data if valid_template(t)]
    
    def save(self, templates: List[Dict[str, Any]]) -> None:
        valid = [t for t in templates if valid_template(t)]
        
        with open(self.file, 'w', encoding='utf-8') as f:
            json.dump(valid, f, indent=2, ensure_ascii=False)
        
        self.templates = valid
    
    def random(self) -> Dict[str, Any]:
        return random.choice(self.templates)
    
    def by_tag(self, tag: str) -> List[Dict[str, Any]]:
        tag = tag.lower()
        return [t for t in self.templates 
                if tag in [t.lower() for t in t.get('tags', [])]]
    
    def search(self, q: str) -> List[Dict[str, Any]]:
        q = q.lower()
        return [t for t in self.templates 
                if q in t['name'].lower() or 
                any(q in tag.lower() for tag in t.get('tags', []))]
    
    def apply(self, input: str, output: str, 
             template: Optional[Dict[str, Any]] = None,
             aspect: str = 'youtube', 
             quality: str = 'balanced') -> str:
        
        t = template or self.random()
        res = ASPECT[aspect]
        w, h = map(int, res.split(':'))
        settings = QUALITY[quality]
        
        # Extract values
        dur = t['duration']
        s1, s2 = t['scale']
        x1, y1, x2, y2 = t['pan']
        r1, r2 = t['rotate']
        
        fps = 25
        frames = dur * fps
        
        os.makedirs(os.path.dirname(output), exist_ok=True)
        
        if self._has_rot(r1, r2):
            return self._with_rotation(input, output, w, h, dur, fps, frames,
                                     s1, s2, x1, y1, x2, y2, r1, r2, settings)
        else:
            return self._zoom_pan_only(input, output, w, h, dur, fps, frames,
                                     s1, s2, x1, y1, x2, y2, settings)
    
    def _has_rot(self, r1: float, r2: float) -> bool:
        return abs(r2 - r1) > 0.1
    
    def _zoom_pan_only(self, input: str, output: str, 
                      w: int, h: int, dur: int, fps: int, frames: int,
                      s1: float, s2: float, x1: float, y1: float, x2: float, y2: float,
                      settings: Dict[str, str]) -> str:
        
        filter = (
            f"[0:v]scale={w}:{h}:force_original_aspect_ratio=increase,"
            f"crop={w}:{h},"
            f"zoompan=z='min({s1}+({s2}-{s1})*on/{frames},{s2})':"
            f"d={frames}:"
            f"x='iw/2-(iw/zoom/2)+({x1}+({x2}-{x1})*on/{frames})':"
            f"y='ih/2-(ih/zoom/2)+({y1}+({y2}-{y1})*on/{frames})':"
            f"s={w}x{h}:fps={fps}[v]"
        )
        
        cmd = [
            'ffmpeg', '-y', '-i', input,
            '-filter_complex', filter,
            '-map', '[v]', '-t', str(dur),
            '-c:v', 'libx264', '-preset', settings['preset'], '-crf', settings['crf'],
            output
        ]
        
        subprocess.run(cmd, check=True, capture_output=True)
        return output
    
    def _with_rotation(self, input: str, output: str,
                      w: int, h: int, dur: int, fps: int, frames: int,
                      s1: float, s2: float, x1: float, y1: float, x2: float, y2: float,
                      r1: float, r2: float, settings: Dict[str, str]) -> str:
        
        temp = output.replace('.mp4', '_temp.mp4')
        
        # Pass 1: Zoom + Pan
        filter1 = (
            f"[0:v]scale={w}:{h}:force_original_aspect_ratio=increase,"
            f"crop={w}:{h},"
            f"zoompan=z='min({s1}+({s2}-{s1})*on/{frames},{s2})':"
            f"d={frames}:"
            f"x='iw/2-(iw/zoom/2)+({x1}+({x2}-{x1})*on/{frames})':"
            f"y='ih/2-(ih/zoom/2)+({y1}+({y2}-{y1})*on/{frames})':"
            f"s={w}x{h}:fps={fps}[v]"
        )
        
        cmd1 = [
            'ffmpeg', '-y', '-i', input,
            '-filter_complex', filter1,
            '-map', '[v]', '-t', str(dur),
            '-c:v', 'libx264', '-preset', settings['preset'], '-crf', settings['crf'],
            temp
        ]
        
        # Pass 2: Rotation
        rad1, rad2 = math.radians(r1), math.radians(r2)
        filter2 = f"rotate='({rad1}+({rad2}-{rad1})*t/{dur})':c=black:ow={w}:oh={h}"
        
        cmd2 = [
            'ffmpeg', '-y', '-i', temp,
            '-vf', filter2,
            '-t', str(dur),
            '-c:v', 'libx264', '-preset', settings['preset'], '-crf', settings['crf'],
            output
        ]
        
        subprocess.run(cmd1, check=True, capture_output=True)
        subprocess.run(cmd2, check=True, capture_output=True)
        
        if os.path.exists(temp):
            os.unlink(temp)
            
        return output
    
    def concat(self, files: List[str], output: str, fmt: str = 'mp4') -> str:
        if not files:
            raise ValueError("No files to concat")
        
        valid = [f for f in files if os.path.exists(f)]
        if not valid:
            raise ValueError("No valid files")
        
        from .utils import unique_name
        list_file = unique_name("list", ".txt")
        
        with open(list_file, 'w', encoding='utf-8') as f:
            for vid in valid:
                path = os.path.abspath(vid).replace('\\', '/')
                f.write(f"file '{path}'\n")
        
        try:
            if fmt == 'gif':
                cmd = [
                    'ffmpeg', '-y', '-f', 'concat', '-safe', '0', '-i', list_file,
                    '-vf', 'fps=12,scale=640:-1:flags=lanczos',
                    '-loop', '0', output
                ]
            else:
                cmd = [
                    'ffmpeg', '-y', '-f', 'concat', '-safe', '0', '-i', list_file,
                    '-c', 'copy', output
                ]
                
                try:
                    subprocess.run(cmd, check=True, capture_output=True)
                except subprocess.CalledProcessError:
                    # Re-encode if copy fails
                    cmd = [
                        'ffmpeg', '-y', '-f', 'concat', '-safe', '0', '-i', list_file,
                        '-c:v', 'libx264', '-preset', 'fast', '-crf', '23',
                        '-c:a', 'aac', '-b:a', '128k', output
                    ]
            
            subprocess.run(cmd, check=True, capture_output=True)
            
        finally:
            if os.path.exists(list_file):
                os.unlink(list_file)
        
        if not os.path.exists(output):
            raise RuntimeError("Output not created")
        
        return output