from flask import Blueprint, render_template, request, jsonify, redirect, url_for, flash
from flask_login import login_user, logout_user, login_required, current_user
from werkzeug.security import generate_password_hash, check_password_hash
from db import get_db, generate_clan_key
from datetime import datetime

auth = Blueprint('auth', __name__)


# ------------------------------------------------------------------
# Helper — resolve the User class from app (avoid circular import)
# ------------------------------------------------------------------
def _make_user(row):
    from app import User
    return User(row['id'], row['username'])


# ------------------------------------------------------------------
# GET/POST /auth/login
# ------------------------------------------------------------------
@auth.route('/auth/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('dashboard.index'))

    error = None
    if request.method == 'POST':
        username = request.form.get('username', '').strip()
        password = request.form.get('password', '')

        conn = get_db()
        row  = conn.execute(
            'SELECT id, username, password_hash FROM users WHERE username = ?', (username,)
        ).fetchone()
        conn.close()

        if row and check_password_hash(row['password_hash'], password):
            user = _make_user(row)
            login_user(user, remember=True)
            return redirect(url_for('dashboard.index'))
        else:
            error = 'Λάθος όνομα χρήστη ή κωδικός.'

    return render_template('login.html', error=error)


# ------------------------------------------------------------------
# GET/POST /auth/register
# ------------------------------------------------------------------
@auth.route('/auth/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('dashboard.index'))

    error = None
    if request.method == 'POST':
        username = request.form.get('username', '').strip()
        password = request.form.get('password', '')
        confirm  = request.form.get('confirm', '')

        if not username or not password:
            error = 'Συμπλήρωσε όνομα χρήστη και κωδικό.'
        elif password != confirm:
            error = 'Οι κωδικοί δεν ταιριάζουν.'
        elif len(password) < 6:
            error = 'Ο κωδικός πρέπει να έχει τουλάχιστον 6 χαρακτήρες.'
        else:
            conn = get_db()
            existing = conn.execute(
                'SELECT id FROM users WHERE username = ?', (username,)
            ).fetchone()
            if existing:
                error = 'Το όνομα χρήστη χρησιμοποιείται ήδη.'
                conn.close()
            else:
                pw_hash = generate_password_hash(password)
                conn.execute(
                    'INSERT INTO users (username, password_hash) VALUES (?, ?)',
                    (username, pw_hash)
                )
                conn.commit()
                row = conn.execute(
                    'SELECT id, username, password_hash FROM users WHERE username = ?', (username,)
                ).fetchone()
                conn.close()
                user = _make_user(row)
                login_user(user, remember=True)
                return redirect(url_for('auth.options'))

    return render_template('register.html', error=error)


# ------------------------------------------------------------------
# GET /auth/logout
# ------------------------------------------------------------------
@auth.route('/auth/logout')
@login_required
def logout():
    logout_user()
    return redirect(url_for('auth.login'))


# ------------------------------------------------------------------
# GET/POST /auth/options  — Clan management page
# ------------------------------------------------------------------
@auth.route('/auth/options', methods=['GET', 'POST'])
@login_required
def options():
    conn = get_db()

    # Load this user's clan (one clan per user for now)
    clan = conn.execute(
        'SELECT * FROM clans WHERE owner_id = ?', (current_user.id,)
    ).fetchone()

    members = []
    if clan:
        members = conn.execute(
            '''SELECT cm.id, cm.player_id, cm.player_name, cm.joined_at,
                      ts.updated_at
               FROM clan_members cm
               LEFT JOIN town_state ts ON ts.player_id = cm.player_id
               WHERE cm.clan_id = ?
               GROUP BY cm.player_id
               ORDER BY cm.joined_at DESC''',
            (clan['id'],)
        ).fetchall()

    conn.close()
    return render_template('options.html', clan=clan, members=members)


# ------------------------------------------------------------------
# POST /auth/clan/create
# ------------------------------------------------------------------
@auth.route('/auth/clan/create', methods=['POST'])
@login_required
def create_clan():
    clan_name = request.form.get('clan_name', '').strip()
    if not clan_name:
        return redirect(url_for('auth.options'))

    conn = get_db()
    existing = conn.execute(
        'SELECT id FROM clans WHERE owner_id = ?', (current_user.id,)
    ).fetchone()

    if not existing:
        key = generate_clan_key()
        conn.execute(
            'INSERT INTO clans (owner_id, name, clan_key) VALUES (?, ?, ?)',
            (current_user.id, clan_name, key)
        )
        conn.commit()

    conn.close()
    return redirect(url_for('auth.options'))


# ------------------------------------------------------------------
# POST /auth/clan/regenerate-key
# ------------------------------------------------------------------
@auth.route('/auth/clan/regenerate-key', methods=['POST'])
@login_required
def regenerate_key():
    new_key = generate_clan_key()
    conn = get_db()
    conn.execute(
        'UPDATE clans SET clan_key = ? WHERE owner_id = ?',
        (new_key, current_user.id)
    )
    conn.commit()
    conn.close()
    return redirect(url_for('auth.options'))


# ------------------------------------------------------------------
# POST /auth/clan/remove-member/<player_id>
# ------------------------------------------------------------------
@auth.route('/auth/clan/remove-member/<player_id>', methods=['POST'])
@login_required
def remove_member(player_id):
    conn = get_db()
    clan = conn.execute(
        'SELECT id FROM clans WHERE owner_id = ?', (current_user.id,)
    ).fetchone()
    if clan:
        conn.execute(
            'DELETE FROM clan_members WHERE clan_id = ? AND player_id = ?',
            (clan['id'], player_id)
        )
        conn.commit()
    conn.close()
    return redirect(url_for('auth.options'))