from flask import Flask, render_template, request, redirect, url_for, session, flash, jsonify
from flask_bcrypt import Bcrypt
from pymongo import MongoClient
from bson.objectid import ObjectId
from datetime import datetime
import os
from dotenv import load_dotenv

load_dotenv()

app = Flask(__name__)
app.config['SECRET_KEY'] = os.getenv('SECRET_KEY')

client = MongoClient(os.getenv('MONGO_URI'))
db = client.get_default_database()
bcrypt = Bcrypt(app)

# --- Helpers ---
def get_user_id():
    return session.get('user_id')

def is_logged_in():
    return 'user_id' in session

# --- Routes ---

@app.route('/')
def index():
    if not is_logged_in():
        return redirect(url_for('login'))
    
    user_id = get_user_id()
    
    # Get all activities
    activities = list(db.activities.find({'user_id': user_id}))
    
    # Check for active time entry
    current_entry = db.time_entries.find_one({
        'user_id': user_id,
        'end_time': None
    })
    
    active_tasks_template = []
    if current_entry:
        # Get tasks associated with the active activity type
        active_activity = db.activities.find_one({'_id': current_entry['activity_id']})
        if active_activity:
            current_entry['activity_name'] = active_activity['name']
            current_entry['activity_color'] = active_activity.get('color', '#3498db')
            # Find template tasks for this activity
            active_tasks_template = list(db.task_templates.find({'activity_id': active_activity['_id']}))

    return render_template('dashboard.html', 
                           activities=activities, 
                           current_entry=current_entry,
                           tasks=active_tasks_template)

@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form['username']
        password = request.form['password']
        
        if db.users.find_one({'username': username}):
            flash('Username already exists')
            return redirect(url_for('register'))
            
        hashed_password = bcrypt.generate_password_hash(password).decode('utf-8')
        db.users.insert_one({'username': username, 'password': hashed_password})
        flash('Account created! Please login.')
        return redirect(url_for('login'))
        
    return render_template('register.html')

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        user = db.users.find_one({'username': request.form['username']})
        if user and bcrypt.check_password_hash(user['password'], request.form['password']):
            session['user_id'] = str(user['_id'])
            return redirect(url_for('index'))
        flash('Login Unsuccessful. Please check username and password')
    return render_template('login.html')

@app.route('/logout')
def logout():
    session.clear()
    return redirect(url_for('login'))

@app.route('/add_activity', methods=['POST'])
def add_activity():
    if not is_logged_in(): return redirect(url_for('login'))
    name = request.form['name']
    color = request.form.get('color', '#3498db')
    
    activity_id = db.activities.insert_one({
        'user_id': get_user_id(),
        'name': name,
        'color': color
    }).inserted_id
    
    # Add optional tasks
    tasks_text = request.form.get('tasks', '')
    if tasks_text:
        tasks = [t.strip() for t in tasks_text.split(',') if t.strip()]
        for t in tasks:
            db.task_templates.insert_one({
                'activity_id': activity_id,
                'user_id': get_user_id(),
                'name': t
            })
            
    return redirect(url_for('index'))

@app.route('/toggle_timer/<activity_id>', methods=['POST'])
def toggle_timer(activity_id):
    if not is_logged_in(): return redirect(url_for('login'))
    user_id = get_user_id()
    note = request.form.get('note', '')

    # Check if this activity is currently running
    current = db.time_entries.find_one({
        'user_id': user_id, 
        'activity_id': ObjectId(activity_id),
        'end_time': None
    })

    if current:
        # Stop it
        db.time_entries.update_one(
            {'_id': current['_id']},
            {'$set': {'end_time': datetime.now()}}
        )
    else:
        # Stop ANY other running timer first (single tasking)
        db.time_entries.update_many(
            {'user_id': user_id, 'end_time': None},
            {'$set': {'end_time': datetime.now()}}
        )
        # Start new
        db.time_entries.insert_one({
            'user_id': user_id,
            'activity_id': ObjectId(activity_id),
            'start_time': datetime.now(),
            'end_time': None,
            'note': note
        })
        
    return redirect(url_for('index'))

@app.route('/stop_timer', methods=['POST'])
def stop_timer():
    if not is_logged_in(): return redirect(url_for('login'))
    db.time_entries.update_many(
        {'user_id': get_user_id(), 'end_time': None},
        {'$set': {'end_time': datetime.now()}}
    )
    return redirect(url_for('index'))

@app.route('/complete_task', methods=['POST'])
def complete_task():
    if not is_logged_in(): return jsonify({'error': 'auth'}), 401
    
    # We log that a specific task template was completed during a specific time entry
    task_name = request.form['task_name']
    entry_id = request.form['entry_id']
    
    db.completed_tasks.insert_one({
        'user_id': get_user_id(),
        'task_name': task_name,
        'time_entry_id': ObjectId(entry_id),
        'completed_at': datetime.now()
    })
    return jsonify({'status': 'success'})

@app.route('/logbook')
def logbook():
    if not is_logged_in(): return redirect(url_for('login'))
    
    # Agrregation to join activities and tasks
    pipeline = [
        {'$match': {'user_id': get_user_id(), 'end_time': {'$ne': None}}},
        {'$sort': {'start_time': -1}},
        {'$lookup': {
            'from': 'activities',
            'localField': 'activity_id',
            'foreignField': '_id',
            'as': 'activity'
        }},
        {'$unwind': '$activity'},
        {'$lookup': {
            'from': 'completed_tasks',
            'localField': '_id',
            'foreignField': 'time_entry_id',
            'as': 'tasks'
        }}
    ]
    
    log = list(db.time_entries.aggregate(pipeline))
    
    # Basic formatting
    for entry in log:
        duration = entry['end_time'] - entry['start_time']
        entry['duration_str'] = str(duration).split('.')[0] # HH:MM:SS
        
    return render_template('logbook.html', log=log)

if __name__ == '__main__':
    app.run(debug=True)