from flask import Flask, render_template, send_from_directory, jsonify, request
import os
import json

app = Flask(__name__, static_folder='static', template_folder='templates')

# Configuration for file uploads
app.config['MAX_CONTENT_LENGTH'] = 2 * 1024 * 1024  # Limit upload to 2MB (JSON files shouldn't be large)

# Jinja2 configuration to avoid conflict with Vue.js
# Using default Jinja2 delimiters {{ }}. Vue.js will be configured to use ['${', '}']



# Project Metadata
PROJECT_INFO = {
    "name": "Stakeholder Map Studio",
    "title_cn": "利益相关者地图工坊",
    "short_description": "可视化的利益相关者分析工具，通过权力-利益矩阵（Power-Interest Matrix）帮助团队识别关键人物并制定沟通策略。",
    "version": "1.1.0"
}

@app.route('/')
def index():
    return render_template('index.html', project=PROJECT_INFO)

@app.route('/health')
def health():
    return "OK", 200

@app.route('/static/<path:path>')
def send_static(path):
    return send_from_directory('static', path)

# API for importing JSON data (server-side validation example)
@app.route('/api/import', methods=['POST'])
def import_data():
    if 'file' not in request.files:
        return jsonify({'error': 'No file part'}), 400
    file = request.files['file']
    if file.filename == '':
        return jsonify({'error': 'No selected file'}), 400
    if file and file.filename.endswith('.json'):
        try:
            data = json.load(file)
            # Basic validation
            if not isinstance(data, list):
                return jsonify({'error': 'Invalid format: Root must be a list'}), 400
            return jsonify({'success': True, 'data': data})
        except json.JSONDecodeError:
            return jsonify({'error': 'Invalid JSON file'}), 400
        except Exception as e:
            return jsonify({'error': str(e)}), 500
    return jsonify({'error': 'Invalid file type'}), 400

@app.errorhandler(413)
def request_entity_too_large(error):
    return jsonify({'error': 'File too large (Max 2MB)'}), 413

@app.errorhandler(404)
def page_not_found(e):
    return render_template('index.html', project=PROJECT_INFO), 404

@app.errorhandler(500)
def internal_server_error(e):
    return jsonify(error=str(e), message="Internal Server Error"), 500

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860, debug=True)