"""
Template Auto-Selection API
Analyze seed data and recommend the best simulation template
"""

import json
import os
from flask import Blueprint, request, jsonify
from ..utils.llm_client import LLMClient
from ..utils.locale import t, get_locale, get_language_instruction
from ..utils.logger import get_logger

logger = get_logger('crowdsight.template')

template_bp = Blueprint('template', __name__)

# Load templates
_templates_path = os.path.join(os.path.dirname(__file__), '..', 'templates.json')
with open(_templates_path, 'r', encoding='utf-8') as f:
    _templates_data = json.load(f)
    _templates = _templates_data['templates']


@template_bp.route('/list', methods=['GET'])
def list_templates():
    """Return all available templates"""
    locale = get_locale()
    lang_key = f'prompt_{locale}' if locale in ('th', 'en', 'zh') else 'prompt_en'
    
    result = []
    for tmpl in _templates:
        result.append({
            'id': tmpl['id'],
            'icon': tmpl['icon'],
            'category': tmpl['category'],
            'prompt': tmpl.get(lang_key, tmpl['prompt_en']),
            'placeholders': tmpl['placeholders'],
            'name': t(f'templates.{tmpl["id"]}'),
        })
    
    return jsonify({'success': True, 'templates': result})


@template_bp.route('/auto-select', methods=['POST'])
def auto_select_template():
    """
    Analyze seed data and recommend the best template + pre-fill prompt.
    
    Request JSON:
        {
            "text": "extracted text from uploaded documents",
            "simulation_requirement": "optional user requirement"
        }
    
    Response JSON:
        {
            "success": true,
            "template_id": "news_event",
            "prompt": "pre-filled prompt with actual values",
            "confidence": 0.85,
            "reasoning": "why this template was selected"
        }
    """
    try:
        data = request.get_json() or {}
        text = data.get('text', '')[:5000]  # Limit to 5000 chars
        simulation_requirement = data.get('simulation_requirement', '')
        
        if not text:
            return jsonify({'success': False, 'error': 'No text provided'}), 400
        
        locale = get_locale()
        lang_instruction = get_language_instruction()
        
        # Build template descriptions for the LLM
        template_desc = []
        lang_key = f'prompt_{locale}' if locale in ('th', 'en', 'zh') else 'prompt_en'
        for tmpl in _templates:
            template_desc.append(f"- {tmpl['id']}: {tmpl.get(lang_key, tmpl['prompt_en'])}")
        
        templates_list = '\n'.join(template_desc)
        
        system_prompt = f"""You are a smart assistant that analyzes document content and recommends the best simulation template.

Available templates:
{templates_list}

Your task:
1. Analyze the document content
2. Select the MOST appropriate template
3. Fill in the template placeholders with actual values from the document
4. Return the result in JSON format

{lang_instruction}"""

        user_prompt = f"""Document content:
{text[:3000]}

{f'User requirement: {simulation_requirement}' if simulation_requirement else ''}

Return JSON:
{{
    "template_id": "best_template_id",
    "prompt": "the template with placeholders filled in with actual values from the document",
    "confidence": 0.0-1.0,
    "reasoning": "brief explanation of why this template was chosen"
}}"""

        llm = LLMClient()
        result = llm.chat_json(
            messages=[
                {"role": "system", "content": system_prompt},
                {"role": "user", "content": user_prompt}
            ],
            temperature=0.3
        )
        
        # Validate template_id
        valid_ids = [t['id'] for t in _templates]
        if result.get('template_id') not in valid_ids:
            result['template_id'] = 'news_event'  # Default fallback
        
        return jsonify({
            'success': True,
            'template_id': result.get('template_id', 'news_event'),
            'prompt': result.get('prompt', ''),
            'confidence': result.get('confidence', 0.5),
            'reasoning': result.get('reasoning', ''),
        })
    
    except Exception as e:
        logger.error(f"Template auto-select failed: {e}")
        return jsonify({'success': False, 'error': str(e)}), 500


@template_bp.route('/<template_id>/filter-rules', methods=['GET'])
def get_filter_rules(template_id):
    """Return entity filter rules for a template (used by Step 1)"""
    for tmpl in _templates:
        if tmpl['id'] == template_id:
            return jsonify({
                'success': True,
                'template_id': template_id,
                'filter_rules': tmpl.get('entity_filter', {})
            })
    
    return jsonify({'success': False, 'error': 'Template not found'}), 404