from flask import Flask, render_template, request, jsonify, session
from flask_cors import CORS
import json
from datetime import datetime
from data_manager import DataManager
import os
from functools import wraps

app = Flask(__name__, static_folder='static', template_folder='templates')
CORS(app)
app.secret_key = os.environ.get('SECRET_KEY', 'rfid-detection-secret-key-change-in-production')

# Create data directory if it doesn't exist
os.makedirs('data', exist_ok=True)

# Global variables
data_manager = DataManager("data/participants.json", "data/scan_logs.json")
last_scan_result = None

# Admin credentials (change this to your desired password)
ADMIN_PASSWORD = os.environ.get('ADMIN_PASSWORD', 'Pleterski')

def require_admin(f):
    """Decorator to require admin authentication"""
    @wraps(f)
    def decorated_function(*args, **kwargs):
        if 'admin' not in session or not session['admin']:
            return jsonify({'success': False, 'message': 'Unauthorized'}), 401
        return f(*args, **kwargs)
    return decorated_function


def process_card(uid):
    """Process scanned card or key"""
    global last_scan_result
    participant = data_manager.get_participant_by_card(uid)

    # Get card and key UIDs from participant
    card_uid = participant.get('card_uid') if participant else None
    key_uid = participant.get('key_uid') if participant else None

    if participant and not data_manager.is_card_expired(participant):
        data_manager.log_scan(uid, "PASS", participant['name'], card_uid=card_uid, key_uid=key_uid)
        last_scan_result = {
            'uid': uid,
            'name': participant['name'],
            'status': 'PASS',
            'color': 'green',
            'timestamp': datetime.now().isoformat()
        }
    else:
        # FAIL if participant not found or card is expired
        name = participant['name'] if participant else "Unknown"
        reason = "Expired" if participant and data_manager.is_card_expired(participant) else "Unknown"
        # For FAIL scans, log the scanned UID as card_uid
        data_manager.log_scan(uid, "FAIL", name, reason, card_uid=uid, key_uid=None)
        last_scan_result = {
            'uid': uid,
            'name': name if participant else 'Unknown',
            'status': 'FAIL',
            'color': 'red',
            'timestamp': datetime.now().isoformat()
        }

    return last_scan_result

# ===== AUTHENTICATION ROUTES =====

@app.route('/api/login', methods=['POST'])
def login():
    """Admin login"""
    try:
        data = request.json
        password = data.get('password', '').strip()

        if password == ADMIN_PASSWORD:
            session['admin'] = True
            return jsonify({'success': True, 'message': 'Logged in successfully'})
        else:
            return jsonify({'success': False, 'message': 'Invalid password'}), 401
    except Exception as e:
        return jsonify({'success': False, 'message': str(e)}), 400

@app.route('/api/logout', methods=['POST'])
def logout():
    """Admin logout"""
    session.pop('admin', None)
    return jsonify({'success': True, 'message': 'Logged out successfully'})

@app.route('/api/check-admin', methods=['GET'])
def check_admin():
    """Check if user is logged in as admin"""
    is_admin = 'admin' in session and session['admin']
    return jsonify({'is_admin': is_admin})

# ===== API Routes =====

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


@app.route('/api/scan', methods=['POST'])
def receive_wifi_scan():
    """Receive card scan from WiFi-enabled ESP8266"""
    try:
        data = request.json
        uid = data.get('uid', '').strip()

        if not uid:
            return jsonify({'success': False, 'message': 'No UID provided'}), 400

        print(f"[WiFi Scan] Card scanned via WiFi: {uid}")
        result = process_card(uid)
        print(f"[WiFi Scan] Result: {result}")
        return jsonify({'success': True, 'result': result})
    except Exception as e:
        print(f"[WiFi Scan Error] {str(e)}")
        return jsonify({'success': False, 'message': str(e)}), 400

@app.route('/scan', methods=['POST'])
def receive_wifi_scan_root():
    """Fallback route for /scan (without /api prefix)"""
    try:
        data = request.json
        uid = data.get('uid', '').strip()

        if not uid:
            return jsonify({'success': False, 'message': 'No UID provided'}), 400

        print(f"[WiFi Scan Root] Card scanned via WiFi: {uid}")
        result = process_card(uid)
        print(f"[WiFi Scan Root] Result: {result}")
        return jsonify({'success': True, 'result': result})
    except Exception as e:
        print(f"[WiFi Scan Root Error] {str(e)}")
        return jsonify({'success': False, 'message': str(e)}), 400

@app.route('/api/participants', methods=['GET'])
def get_participants():
    """Get all participants"""
    participants = data_manager.get_all_participants()
    return jsonify(participants)

@app.route('/api/participants', methods=['POST'])
@require_admin
def add_participant():
    """Add a new participant (admin only)"""
    try:
        data = request.json
        if not data:
            return jsonify({'success': False, 'message': 'Invalid JSON'}), 400

        name = (data.get('name') or '').strip()
        card_uid = (data.get('card_uid') or '').strip() or None
        key_uid = (data.get('key_uid') or '').strip() or None
        expiration_date = (data.get('expiration_date') or '').strip() or None

        if not name:
            return jsonify({'success': False, 'message': 'Name is required'}), 400

        if not card_uid and not key_uid:
            return jsonify({'success': False, 'message': 'At least one of card UID or key UID is required'}), 400

        if data_manager.add_participant(name, card_uid, expiration_date, key_uid):
            return jsonify({'success': True, 'message': 'Participant added'})
        else:
            return jsonify({'success': False, 'message': 'Duplicate UID or error'}), 400
    except Exception as e:
        print(f"Error adding participant: {e}")
        return jsonify({'success': False, 'message': str(e)}), 400

@app.route('/api/participants/<int:participant_id>', methods=['PUT'])
@require_admin
def update_participant(participant_id):
    """Update a participant (admin only)"""
    try:
        data = request.json
        if not data:
            return jsonify({'success': False, 'message': 'Invalid JSON'}), 400

        name = (data.get('name') or '').strip()
        card_uid = (data.get('card_uid') or '').strip() or None
        key_uid = (data.get('key_uid') or '').strip() or None
        expiration_date = (data.get('expiration_date') or '').strip() or None

        if not name:
            return jsonify({'success': False, 'message': 'Name is required'}), 400

        if not card_uid and not key_uid:
            return jsonify({'success': False, 'message': 'At least one of card UID or key UID is required'}), 400

        if data_manager.update_participant(participant_id, name, card_uid, expiration_date, key_uid):
            return jsonify({'success': True, 'message': 'Participant updated'})
        else:
            return jsonify({'success': False, 'message': 'Update failed'}), 400
    except Exception as e:
        print(f"Error updating participant: {e}")
        return jsonify({'success': False, 'message': str(e)}), 400

@app.route('/api/participants/<int:participant_id>', methods=['DELETE'])
@require_admin
def delete_participant(participant_id):
    """Delete a participant (admin only)"""
    if data_manager.delete_participant(participant_id):
        return jsonify({'success': True, 'message': 'Participant deleted'})
    else:
        return jsonify({'success': False, 'message': 'Delete failed'}), 400

@app.route('/api/logs', methods=['GET'])
def get_logs():
    """Get scan logs"""
    filter_type = request.args.get('filter', 'All')
    logs = data_manager.get_scan_history(1000)

    if filter_type == 'PASS':
        logs = [log for log in logs if log['scan_result'] == 'PASS']
    elif filter_type == 'FAIL':
        logs = [log for log in logs if log['scan_result'] == 'FAIL']

    return jsonify(logs)

@app.route('/api/logs/unregistered', methods=['POST'])
def add_unregistered_log():
    """Add unregistered user to logs"""
    try:
        data = request.json
        if not data:
            return jsonify({'success': False, 'message': 'Invalid JSON'}), 400

        name = (data.get('name') or '').strip()
        timestamp = (data.get('timestamp') or '').strip() or None

        if not name:
            return jsonify({'success': False, 'message': 'Name is required'}), 400

        if data_manager.log_unregistered_user(name, timestamp):
            return jsonify({'success': True, 'message': 'Unregistered user logged'})
        else:
            return jsonify({'success': False, 'message': 'Error logging user'}), 400
    except Exception as e:
        print(f"Error adding unregistered log: {e}")
        return jsonify({'success': False, 'message': str(e)}), 400

@app.route('/api/logs/<int:log_id>', methods=['DELETE'])
@require_admin
def delete_log(log_id):
    """Delete a log entry (admin only)"""
    try:
        if data_manager.delete_log(log_id):
            return jsonify({'success': True, 'message': 'Log deleted'})
        else:
            return jsonify({'success': False, 'message': 'Log not found'}), 404
    except Exception as e:
        print(f"Error deleting log: {e}")
        return jsonify({'success': False, 'message': str(e)}), 400

@app.route('/api/export', methods=['GET'])
def export_logs():
    """Export logs to Excel - returns file data for client-side saving"""
    try:
        import openpyxl
        from openpyxl.styles import PatternFill, Font, Alignment
        import io
        import base64
        from datetime import datetime as dt

        logs = data_manager.get_scan_history(10000)

        # Apply filters from query parameters
        filter_type = request.args.get('filter', 'All')
        participant_filter = request.args.get('participant', '')
        start_date = request.args.get('startDate', '')
        end_date = request.args.get('endDate', '')

        # Filter by result type
        if filter_type == 'PASS':
            logs = [log for log in logs if log['scan_result'] == 'PASS']
        elif filter_type == 'FAIL':
            logs = [log for log in logs if log['scan_result'] == 'FAIL']

        # Filter by participant
        if participant_filter:
            logs = [log for log in logs if log.get('name') == participant_filter]

        # Filter by date range
        if start_date:
            start_dt = dt.strptime(start_date, '%Y-%m-%d')
            logs = [log for log in logs if dt.fromisoformat(log['timestamp'].replace('Z', '+00:00')) >= start_dt]

        if end_date:
            end_dt = dt.strptime(end_date, '%Y-%m-%d')
            end_dt = end_dt.replace(hour=23, minute=59, second=59)
            logs = [log for log in logs if dt.fromisoformat(log['timestamp'].replace('Z', '+00:00')) <= end_dt]

        if not logs:
            return jsonify({'success': False, 'message': 'No logs to export'}), 400

        wb = openpyxl.Workbook()
        ws = wb.active
        ws.title = "Scan Logs"

        headers = ["ID", "Name", "Card UID", "Key UID", "Result", "Date", "Time"]
        ws.append(headers)

        header_fill = PatternFill(start_color="4472C4", end_color="4472C4", fill_type="solid")
        header_font = Font(bold=True, color="FFFFFF")

        for cell in ws[1]:
            cell.fill = header_fill
            cell.font = header_font
            cell.alignment = Alignment(horizontal="center", vertical="center")

        for log in logs:
            timestamp = log['timestamp']
            date_part = timestamp[:10]
            time_part = timestamp[11:19]

            ws.append([
                log['id'],
                log['name'],
                log['card_uid'],
                log.get('key_uid', ''),
                log['scan_result'],
                date_part,
                time_part
            ])

        pass_fill = PatternFill(start_color="C6EFCE", end_color="C6EFCE", fill_type="solid")
        pass_font = Font(color="006100")
        fail_fill = PatternFill(start_color="FFC7CE", end_color="FFC7CE", fill_type="solid")
        fail_font = Font(color="9C0006")

        for idx, row in enumerate(ws.iter_rows(min_row=2, max_row=ws.max_row), start=2):
            result_cell = row[4]  # Result is now column 5 (index 4)
            if result_cell.value == "PASS":
                result_cell.fill = pass_fill
                result_cell.font = pass_font
            else:
                result_cell.fill = fail_fill
                result_cell.font = fail_font

        ws.column_dimensions['A'].width = 8
        ws.column_dimensions['B'].width = 20
        ws.column_dimensions['C'].width = 20
        ws.column_dimensions['D'].width = 20
        ws.column_dimensions['E'].width = 10
        ws.column_dimensions['F'].width = 12
        ws.column_dimensions['G'].width = 10

        # Generate filename
        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
        filename = f"scan_logs_{timestamp}.xlsx"

        # Save to bytes buffer
        buffer = io.BytesIO()
        wb.save(buffer)
        buffer.seek(0)

        # Encode to base64 for transfer
        file_data = base64.b64encode(buffer.getvalue()).decode('utf-8')

        return jsonify({
            'success': True,
            'filename': filename,
            'data': file_data
        })

    except Exception as e:
        return jsonify({'success': False, 'message': str(e)}), 500

@app.route('/api/stats', methods=['GET'])
def get_stats():
    """Get statistics"""
    stats = data_manager.get_statistics()
    return jsonify(stats)

@app.route('/api/documents', methods=['GET'])
def get_documents():
    """List PDF files in static/PDF folder"""
    pdf_dir = os.path.join(app.static_folder, 'PDF')
    os.makedirs(pdf_dir, exist_ok=True)
    files = [f for f in os.listdir(pdf_dir) if f.lower().endswith('.pdf')]
    files.sort()
    return jsonify(files)

@app.route('/api/last-scan', methods=['GET'])
def get_last_scan():
    """Get last scan result"""
    return jsonify(last_scan_result if last_scan_result else {
        'uid': '-',
        'name': '-',
        'status': '-',
        'color': 'gray'
    })

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