# -*- coding: utf-8 -*-
"""
동물약 복약안내 PDF 렌더러 v2
- 마스터 JSON 구조 지원
- 카테고리별 템플릿 분기 (구충제/NSAIDs)
"""

import os
import json
import asyncio
from datetime import datetime
from typing import List, Dict, Optional
from jinja2 import Environment, FileSystemLoader


class AnimalMedRendererV2:
    """동물약 복약안내 PDF 렌더링 API v2"""
    
    def __init__(self, master_dir: str = None, template_path: str = None):
        base_dir = os.path.dirname(os.path.dirname(__file__))
        
        self.master_dir = master_dir or os.path.join(base_dir, 'data', 'master')
        self.template_dir = template_path or os.path.join(base_dir, 'templates')
        
        # Jinja2 템플릿 환경
        self.jinja_env = Environment(
            loader=FileSystemLoader(self.template_dir),
            autoescape=True
        )
        
        # 마스터 약품 데이터 로드
        self._load_master_data()
    
    def _load_master_data(self):
        """마스터 JSON 파일들 로드"""
        self.drugs = {}
        
        if not os.path.exists(self.master_dir):
            os.makedirs(self.master_dir, exist_ok=True)
            return
        
        for filename in os.listdir(self.master_dir):
            if filename.endswith('.json'):
                filepath = os.path.join(self.master_dir, filename)
                with open(filepath, 'r', encoding='utf-8') as f:
                    drug = json.load(f)
                    self.drugs[drug['product_id']] = drug
    
    def get_drug(self, product_id: str) -> Optional[Dict]:
        """제품 ID로 약품 조회"""
        return self.drugs.get(product_id)
    
    def get_drugs(self, product_ids: List[str]) -> List[Dict]:
        """여러 제품 ID로 약품 조회"""
        result = []
        for pid in product_ids:
            drug = self.get_drug(pid)
            if drug:
                result.append(drug)
        return result
    
    def render_html(
        self,
        product_ids: List[str],
        patient_name: str = "홍길동",
        pet_name: str = "뽀삐",
        pet_species: str = "개",
        pet_age: str = "3세",
        pharmacy_name: str = "청춘약국",
        pharmacy_tel: str = "033-481-7390",
        pharmacy_address: str = "강원 양구군 양구읍"
    ) -> str:
        """
        마스터 JSON 기반 HTML 복약안내문 렌더링 (v2)
        """
        drugs = self.get_drugs(product_ids)
        
        if not drugs:
            raise ValueError(f"유효한 약품을 찾을 수 없습니다: {product_ids}")
        
        template = self.jinja_env.get_template('medication_guide_v2.html')
        
        html = template.render(
            drugs=drugs,
            patient_name=patient_name,
            pet_name=pet_name,
            pet_species=pet_species,
            pet_age=pet_age,
            pharmacy_name=pharmacy_name,
            pharmacy_tel=pharmacy_tel,
            pharmacy_address=pharmacy_address,
            issue_date=datetime.now().strftime('%Y년 %m월 %d일')
        )
        
        return html
    
    def render_to_pdf(
        self,
        product_ids: List[str],
        output_path: str = None,
        **kwargs
    ) -> Dict:
        """
        마스터 JSON 기반 PDF 복약안내문 생성 (v2)
        """
        # HTML 렌더링
        html_content = self.render_html(product_ids, **kwargs)
        
        # 출력 경로
        if not output_path:
            import tempfile
            import time
            output_path = os.path.join(tempfile.gettempdir(), f'animal_med_v2_{int(time.time())}.pdf')
        
        # HTML → PDF
        async def _convert():
            from playwright.async_api import async_playwright
            
            async with async_playwright() as p:
                browser = await p.chromium.launch(headless=True)
                page = await browser.new_page(viewport={'width': 794, 'height': 1123})
                
                await page.set_content(html_content, wait_until='networkidle')
                
                # 콘텐츠 크기 확인
                rect = await page.evaluate('''() => {
                    const el = document.querySelector('.container');
                    const rect = el.getBoundingClientRect();
                    return { width: rect.width, height: rect.height };
                }''')
                
                # A4에 맞는 scale 계산
                content_width_pt = rect['width'] * 0.75
                content_height_pt = rect['height'] * 0.75
                
                scale_x = 595 / content_width_pt if content_width_pt > 0 else 1
                scale_y = 842 / content_height_pt if content_height_pt > 0 else 1
                scale = min(scale_x, scale_y, 1.0)
                
                await page.pdf(
                    path=output_path,
                    format='A4',
                    print_background=True,
                    margin={'top': '0', 'right': '0', 'bottom': '0', 'left': '0'},
                    scale=scale
                )
                
                await browser.close()
        
        try:
            try:
                loop = asyncio.get_running_loop()
            except RuntimeError:
                loop = None
            
            if loop and loop.is_running():
                import concurrent.futures
                with concurrent.futures.ThreadPoolExecutor() as executor:
                    future = executor.submit(asyncio.run, _convert())
                    future.result()
            else:
                asyncio.run(_convert())
            
            drugs = self.get_drugs(product_ids)
            
            return {
                'success': True,
                'pdf_path': output_path,
                'drug_count': len(drugs),
                'drugs': [d['name'] for d in drugs]
            }
        except Exception as e:
            return {'success': False, 'error': str(e)}
    
    def list_drugs(self) -> List[Dict]:
        """마스터 약품 목록 반환"""
        return [
            {
                'product_id': d['product_id'],
                'name': d['name'],
                'category': d['category'],
                'category_display': d.get('category_display', d['category'])
            }
            for d in self.drugs.values()
        ]