from flask import Flask, render_template, request, jsonify, session
import json
import random
import re
import os
from datetime import datetime
from config import config

# Create Flask application
app = Flask(__name__)

# Configure the application
config_name = os.environ.get('FLASK_CONFIG', 'default')
app.config.from_object(config[config_name])
config[config_name].init_app(app)

# Function to parse markdown and extract questions
def parse_markdown_questions():
    with open(app.config['MARKDOWN_FILE'], 'r', encoding='utf-8') as file:
        content = file.read()

    questions = []

    # Split content by questions using ### as separator
    question_blocks = re.split(r'\n### (\d+)\n', content)[1:]  # Ignore first empty element

    for i in range(0, len(question_blocks), 2):
        if i + 1 >= len(question_blocks):
            break

        question_num = int(question_blocks[i])
        question_content = question_blocks[i + 1].strip()

        # Check if there's an image at the beginning (now supports both local and remote URLs)
        has_image = ('![](https://sierdgtt.mtc.gob.pe/Content/img-data/' in question_content or
                    '![](/static/images/' in question_content)
        image_url = ""
        if has_image:
            # Try local images first, then remote
            img_match = re.search(r'!\[\]\((/static/images/[^)]+)\)', question_content)
            if not img_match:
                img_match = re.search(r'!\[\]\((https://sierdgtt\.mtc\.gob\.pe/Content/img-data/[^)]+)\)', question_content)

            if img_match:
                image_url = img_match.group(1)
                question_content = re.sub(r'!\[\]\([^)]+\)\n*', '', question_content).strip()

        # Separate question from options
        lines = question_content.split('\n')
        question_lines = []
        option_lines = []
        in_options = False

        for line in lines:
            line = line.strip()
            if not line:
                continue
            if re.match(r'^✅?\s*[a-d]\)', line):
                in_options = True
                option_lines.append(line)
            elif not in_options:
                question_lines.append(line)

        question_text = ' '.join(question_lines).strip()

        # Extract options and correct answer
        options = []
        correct_option = ""

        for line in option_lines:
            original_line = line.strip()

            # Check if this line has the ✅
            if '✅' in original_line:
                # Extract the letter of the correct option
                match = re.search(r'✅\s*([a-d])\)', original_line)
                if match:
                    correct_option = match.group(1)

            # Clean the line by removing ✅ completely and any extra spaces
            clean_line = re.sub(r'✅\s*', '', original_line)
            clean_line = re.sub(r'✅', '', clean_line)  # In case there's ✅ without spaces
            clean_line = clean_line.strip()
            options.append(clean_line)

        if len(options) >= 2 and correct_option and question_text:  # Validate we have complete data
            questions.append({
                'id': question_num,
                'question': question_text,
                'options': options,
                'correct': correct_option,
                'image': image_url,
                'has_image': has_image
            })

    return sorted(questions, key=lambda x: x['id'])

# Load questions when starting the application
QUESTIONS = parse_markdown_questions()

@app.route('/')
def index():
    return render_template('index.html', total_questions=len(QUESTIONS))

@app.route('/study')
def study():
    return render_template('study.html')

@app.route('/practice')
def practice():
    return render_template('practice.html')

@app.route('/exam')
def exam():
    return render_template('exam.html')

@app.route('/api/questions')
def get_questions():
    mode = request.args.get('mode', 'all')
    count = request.args.get('count', type=int)

    if mode == 'random':
        questions = random.sample(QUESTIONS, min(count or 20, len(QUESTIONS)))
    elif mode == 'range':
        start = request.args.get('start', 1, type=int)
        end = request.args.get('end', len(QUESTIONS), type=int)
        questions = [q for q in QUESTIONS if start <= q['id'] <= end]
    else:
        questions = QUESTIONS

    return jsonify(questions)

@app.route('/api/question/<int:question_id>')
def get_question(question_id):
    question = next((q for q in QUESTIONS if q['id'] == question_id), None)
    if question:
        return jsonify(question)
    return jsonify({'error': 'Pregunta no encontrada'}), 404

@app.route('/api/check_answer', methods=['POST'])
def check_answer():
    data = request.json
    question_id = data.get('question_id')
    user_answer = data.get('answer')

    question = next((q for q in QUESTIONS if q['id'] == question_id), None)
    if not question:
        return jsonify({'error': 'Pregunta no encontrada'}), 404

    is_correct = user_answer == question['correct']

    return jsonify({
        'correct': is_correct,
        'correct_answer': question['correct'],
        'explanation': f"La respuesta correcta es: {question['correct']}"
    })

@app.route('/api/stats')
def get_stats():
    # Statistics are now handled completely in client localStorage
    # This endpoint returns default stats for compatibility
    return jsonify({
        'total_answered': 0,
        'correct_answers': 0,
        'incorrect_answers': 0,
        'accuracy': 0,
        'message': 'Stats handled by localStorage'
    })

@app.route('/api/update_stats', methods=['POST'])
def update_stats():
    # Statistics are now handled completely in client localStorage
    # This endpoint only confirms that the update was received
    data = request.json
    is_correct = data.get('correct', False)

    return jsonify({
        'success': True,
        'message': 'Stats updated in localStorage',
        'received_correct': is_correct
    })

@app.route('/api/reset_stats', methods=['POST'])
def reset_stats():
    """Confirm that statistics were reset in localStorage"""
    return jsonify({
        'success': True,
        'message': 'Estadísticas restablecidas correctamente en localStorage'
    })

if __name__ == '__main__':
    app.run(debug=True, host='0.0.0.0', port=5000)