from flask import Blueprint, render_template, redirect, url_for, flash, request, current_app
from flask_login import login_required, current_user
from werkzeug.security import generate_password_hash

from app.extensions import db
from app.models.user import PortalUser
from app.models.app_access import AppAccess
from app.models.api_key import ApiKey

bp = Blueprint('settings', __name__, url_prefix='/settings')


def _sync_user_to_app(app_id, username, role):
    """
    Notify an app's internal /internal/sync-user endpoint so the user is
    pre-created / role-updated in that app's own DB.
    Silently swallows errors so it never breaks the portal flow.
    """
    import urllib.request
    import json

    registered = {a['id']: a for a in current_app.config.get('REGISTERED_APPS', [])}
    app_meta = registered.get(app_id)
    if not app_meta or not app_meta.get('internal_url'):
        return

    secret = current_app.config.get('INTERNAL_SYNC_SECRET', '')
    url = app_meta['internal_url'].rstrip('/') + '/internal/sync-user'
    body = json.dumps({'username': username, 'role': role}).encode()
    req = urllib.request.Request(
        url,
        data=body,
        headers={
            'Content-Type': 'application/json',
            'X-Internal-Token': secret,
        },
        method='POST',
    )
    try:
        with urllib.request.urlopen(req, timeout=3):
            pass
    except Exception:
        pass  # Best-effort; SSO will sync on first login anyway


def _admin_required(f):
    from functools import wraps
    from flask_login import current_user
    from flask import abort

    @wraps(f)
    def decorated(*args, **kwargs):
        if not current_user.is_admin:
            abort(403)
        return f(*args, **kwargs)
    return decorated


@bp.route('/')
@login_required
@_admin_required
def index():
    users = PortalUser.query.order_by(PortalUser.username).all()
    registered_apps = current_app.config['REGISTERED_APPS']
    return render_template('settings/index.html', users=users, registered_apps=registered_apps)


# ── User management ────────────────────────────────────────────────────────────

@bp.route('/users/new', methods=['GET', 'POST'])
@login_required
@_admin_required
def new_user():
    registered_apps = current_app.config['REGISTERED_APPS']
    if request.method == 'POST':
        username = request.form.get('username', '').strip()
        email = request.form.get('email', '').strip()
        password = request.form.get('password', '')
        is_admin = request.form.get('is_admin') == 'on'

        if not username or not email or not password:
            flash('Username, email and password are required.', 'danger')
            return render_template('settings/new_user.html', registered_apps=registered_apps)

        if PortalUser.query.filter_by(username=username).first():
            flash('Username already exists.', 'danger')
            return render_template('settings/new_user.html', registered_apps=registered_apps)

        user = PortalUser(
            username=username,
            email=email,
            password_hash=generate_password_hash(password),
            is_admin=is_admin,
            is_active=True,
        )
        db.session.add(user)
        db.session.flush()

        for app in registered_apps:
            app_id = app['id']
            role_val = request.form.get(f'role_{app_id}', 'none').strip()
            if role_val in ('admin', 'user'):
                db.session.add(AppAccess(user_id=user.id, app_name=app_id,
                                         is_active=True, app_role=role_val))

        db.session.commit()

        # Best-effort: pre-create user in each app that supports sync
        for app in registered_apps:
            app_id = app['id']
            role_val = request.form.get(f'role_{app_id}', 'none').strip()
            if role_val in ('admin', 'user'):
                _sync_user_to_app(app_id, username, role_val)

        flash(f'User "{username}" created successfully.', 'success')
        return redirect(url_for('settings.index'))

    return render_template('settings/new_user.html', registered_apps=registered_apps)


@bp.route('/users/<int:user_id>/access', methods=['POST'])
@login_required
@_admin_required
def update_access(user_id):
    user = PortalUser.query.get_or_404(user_id)
    registered_apps = current_app.config['REGISTERED_APPS']

    for app in registered_apps:
        app_id = app['id']
        # The UI sends role_<app_id> = 'admin' | 'user' | 'none'
        role_val = request.form.get(f'role_{app_id}', 'none').strip()
        should_have = role_val in ('admin', 'user')
        app_role = role_val if role_val in ('admin', 'user') else None

        existing = AppAccess.query.filter_by(user_id=user.id, app_name=app_id).first()
        if existing:
            existing.is_active = should_have
            existing.app_role = app_role
        elif should_have:
            db.session.add(AppAccess(user_id=user.id, app_name=app_id,
                                     is_active=True, app_role=app_role))

    db.session.commit()

    # Best-effort: pre-create / update user in each app that supports sync
    for app in registered_apps:
        app_id = app['id']
        role_val = request.form.get(f'role_{app_id}', 'none').strip()
        if role_val in ('admin', 'user'):
            _sync_user_to_app(app_id, user.username, role_val)

    flash(f'Access for "{user.username}" updated.', 'success')
    return redirect(url_for('settings.index'))


@bp.route('/users/<int:user_id>/delete', methods=['POST'])
@login_required
@_admin_required
def delete_user(user_id):
    if user_id == current_user.id:
        flash('You cannot delete your own account.', 'danger')
        return redirect(url_for('settings.index'))
    user = PortalUser.query.get_or_404(user_id)
    db.session.delete(user)
    db.session.commit()
    flash(f'User "{user.username}" deleted.', 'success')
    return redirect(url_for('settings.index'))


# ── API key management ─────────────────────────────────────────────────────────

@bp.route('/api-keys')
@login_required
@_admin_required
def api_keys():
    keys = ApiKey.query.order_by(ApiKey.created_at.desc()).all()
    registered_apps = current_app.config['REGISTERED_APPS']
    users = PortalUser.query.order_by(PortalUser.username).all()
    return render_template('settings/api_keys.html', keys=keys, registered_apps=registered_apps, users=users)


@bp.route('/api-keys/new', methods=['POST'])
@login_required
@_admin_required
def new_api_key():
    user_id = request.form.get('user_id', type=int)
    app_name = request.form.get('app_name', '').strip()
    description = request.form.get('description', '').strip()

    if not user_id or not app_name:
        flash('User and application are required.', 'danger')
        return redirect(url_for('settings.api_keys'))

    key = ApiKey(
        user_id=user_id,
        key=ApiKey.generate_key(),
        app_name=app_name,
        description=description or None,
    )
    db.session.add(key)
    db.session.commit()
    flash(f'API key created: {key.key}', 'success')
    return redirect(url_for('settings.api_keys'))


@bp.route('/api-keys/<int:key_id>/revoke', methods=['POST'])
@login_required
@_admin_required
def revoke_api_key(key_id):
    key = ApiKey.query.get_or_404(key_id)
    key.is_active = False
    db.session.commit()
    flash('API key revoked.', 'success')
    return redirect(url_for('settings.api_keys'))


# ── Module management ──────────────────────────────────────────────────────────

@bp.route('/modules')
@login_required
@_admin_required
def modules():
    from app.models.module_config import ModuleConfig
    from app.services import module_manager

    registered_apps = current_app.config['REGISTERED_APPS']
    cfg_map = {m.app_id: m for m in ModuleConfig.query.all()}

    module_statuses = []
    for app in registered_apps:
        cfg = cfg_map.get(app['id'])
        enabled = cfg.enabled if cfg else True
        running = module_manager.is_running(app['id'])
        module_statuses.append({
            'app': app,
            'enabled': enabled,
            'running': running,
        })

    return render_template('settings/modules.html', module_statuses=module_statuses)


@bp.route('/modules/<app_id>/toggle', methods=['POST'])
@login_required
@_admin_required
def toggle_module(app_id):
    from app.models.module_config import ModuleConfig
    from app.services import module_manager

    registered_ids = {a['id'] for a in current_app.config['REGISTERED_APPS']}
    if app_id not in registered_ids:
        flash('Unknown application.', 'danger')
        return redirect(url_for('settings.modules'))

    action = request.form.get('action')   # 'enable' or 'disable'
    if action not in ('enable', 'disable'):
        flash('Invalid action.', 'danger')
        return redirect(url_for('settings.modules'))

    cfg = ModuleConfig.query.filter_by(app_id=app_id).first()
    if cfg is None:
        cfg = ModuleConfig(app_id=app_id, enabled=True)
        db.session.add(cfg)

    app_meta = next(a for a in current_app.config['REGISTERED_APPS'] if a['id'] == app_id)
    name = app_meta['name']

    if action == 'disable':
        cfg.enabled = False
        db.session.commit()
        module_manager.write_module_state(app_id, False)
        if module_manager.is_running(app_id):
            module_manager.stop_service(app_id)
            flash(f'{name} has been disabled and stopped.', 'success')
        else:
            flash(f'{name} has been disabled.', 'success')

    else:  # enable
        cfg.enabled = True
        db.session.commit()
        module_manager.write_module_state(app_id, True)
        if not module_manager.is_running(app_id):
            ok = module_manager.start_service(app_id)
            if ok:
                flash(f'{name} has been enabled and is starting up.', 'success')
            else:
                flash(
                    f'{name} enabled. No launch spec found — '
                    'run ./start-dev.sh to start it.',
                    'warning',
                )
        else:
            flash(f'{name} is already running and has been re-enabled.', 'success')

    return redirect(url_for('settings.modules'))