# /home/Autopartes/pos/blueprints/b2b_bp.py
"""Nexus B2B yonke marketplace blueprint.

Wholesale trading of used parts between yonkes (deshuesaderos): one tenant
publishes its used pieces, another buys them. Listings and orders live in the
MASTER DB; the pieces stay in each tenant DB.

All endpoints live under /pos/api/b2b.
Permissions: yonke.view for reads, yonke.manage for writes.

Seller:
  GET    /pos/api/b2b/my-listings          my published listings
  POST   /pos/api/b2b/listings             publish/refresh a listing
  PATCH  /pos/api/b2b/listings/<id>        edit price/status/notes
  DELETE /pos/api/b2b/listings/<id>        soft-delete (status='removed')
  GET    /pos/api/b2b/seller/status        {is_seller, listings_count, ...}
Buyer:
  GET    /pos/api/b2b/catalog              available listings from other tenants
  GET    /pos/api/b2b/listings/<id>        listing detail (+ seller_name)
Orders (both):
  POST   /pos/api/b2b/orders               create an order from listings
  GET    /pos/api/b2b/orders               my orders as buyer
  GET    /pos/api/b2b/orders/incoming      my orders as seller
  GET    /pos/api/b2b/orders/<id>          order detail (participants only)
  PUT    /pos/api/b2b/orders/<id>/status   transition the order status
"""

from flask import Blueprint, g, jsonify, request
from middleware import require_auth
from services import b2b_service
from tenant_db import get_master_conn

b2b_bp = Blueprint('b2b', __name__, url_prefix='/pos/api/b2b')


def _int_arg(name, default, minimum, maximum):
    try:
        val = int(request.args.get(name, default))
    except (TypeError, ValueError):
        return default
    return min(max(val, minimum), maximum)


def _error_response(e):
    """Map a service exception to (json, status); never leaks a 500."""
    if isinstance(e, b2b_service.B2BForbidden):
        return jsonify({'error': str(e)}), 403
    if isinstance(e, b2b_service.B2BNotFound):
        return jsonify({'error': str(e)}), 404
    if isinstance(e, b2b_service.B2BValidationError):
        return jsonify({'error': str(e)}), 400
    return jsonify({'error': str(e)}), 500


# ═══════════════════════════════════════════════════════════════════════════
# SELLER
# ═══════════════════════════════════════════════════════════════════════════

@b2b_bp.route('/my-listings', methods=['GET'])
@require_auth('yonke.view')
def my_listings():
    """Listings published by the current tenant."""
    master = get_master_conn()
    try:
        data = b2b_service.list_my_listings(
            master, g.tenant_id, status=request.args.get('status'))
        return jsonify({'data': data})
    except Exception as e:
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/listings', methods=['POST'])
@require_auth('yonke.manage')
def publish_listing():
    """Publish (or refresh) one of my used/rebuild pieces to the B2B catalog."""
    data = request.get_json(silent=True) or {}
    master = get_master_conn()
    try:
        listing = b2b_service.publish_listing(master, g.tenant_id, data)
        master.commit()
        return jsonify(listing), 201
    except Exception as e:
        master.rollback()
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/listings/<int:listing_id>', methods=['PATCH'])
@require_auth('yonke.manage')
def update_listing(listing_id):
    """Edit price_wholesale / status / notes of one of my listings."""
    data = request.get_json(silent=True) or {}
    master = get_master_conn()
    try:
        listing = b2b_service.update_listing(master, g.tenant_id, listing_id, data)
        master.commit()
        return jsonify(listing)
    except Exception as e:
        master.rollback()
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/listings/<int:listing_id>', methods=['DELETE'])
@require_auth('yonke.manage')
def remove_listing(listing_id):
    """Soft-delete a listing (status='removed')."""
    master = get_master_conn()
    try:
        b2b_service.remove_listing(master, g.tenant_id, listing_id)
        master.commit()
        return jsonify({'ok': True, 'id': listing_id, 'status': 'removed'})
    except Exception as e:
        master.rollback()
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/seller/status', methods=['GET'])
@require_auth('yonke.view')
def seller_status():
    """{is_seller, listings_count, incoming_orders} for the current tenant."""
    master = get_master_conn()
    try:
        return jsonify(b2b_service.get_seller_status(master, g.tenant_id))
    except Exception as e:
        return _error_response(e)
    finally:
        master.close()


# ═══════════════════════════════════════════════════════════════════════════
# BUYER — catalog
# ═══════════════════════════════════════════════════════════════════════════

@b2b_bp.route('/catalog', methods=['GET'])
@require_auth('yonke.view')
def catalog():
    """Available listings from OTHER tenants, with seller_name and pagination."""
    master = get_master_conn()
    try:
        items, pagination = b2b_service.list_catalog(
            master, g.tenant_id,
            filters={
                'q': request.args.get('q'),
                'make': request.args.get('make'),
                'model': request.args.get('model'),
                'year': request.args.get('year'),
                'grade': request.args.get('grade'),
            },
            page=_int_arg('page', 1, 1, 10**9),
            per_page=_int_arg('per_page', 12, 1, 100),
        )
        return jsonify({'data': items, 'pagination': pagination})
    except Exception as e:
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/listings/<int:listing_id>', methods=['GET'])
@require_auth('yonke.view')
def get_listing(listing_id):
    """Listing detail with seller_name."""
    master = get_master_conn()
    try:
        listing = b2b_service.get_listing(master, listing_id)
        if not listing:
            return jsonify({'error': 'Listing no encontrado'}), 404
        return jsonify(listing)
    except Exception as e:
        return _error_response(e)
    finally:
        master.close()


# ═══════════════════════════════════════════════════════════════════════════
# ORDERS
# ═══════════════════════════════════════════════════════════════════════════

@b2b_bp.route('/orders', methods=['POST'])
@require_auth('yonke.manage')
def create_order():
    """Create a pending order from one or more listings (single seller)."""
    data = request.get_json(silent=True) or {}
    master = get_master_conn()
    try:
        order = b2b_service.create_order(
            master, g.tenant_id, data.get('items'), notes=data.get('notes'))
        master.commit()
        return jsonify(order), 201
    except Exception as e:
        master.rollback()
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/orders', methods=['GET'])
@require_auth('yonke.view')
def list_orders():
    """My orders as buyer (role='buyer')."""
    master = get_master_conn()
    try:
        return jsonify({'data': b2b_service.list_orders(master, g.tenant_id, 'buyer')})
    except Exception as e:
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/orders/incoming', methods=['GET'])
@require_auth('yonke.view')
def list_incoming_orders():
    """Orders I must fulfil as seller (role='seller')."""
    master = get_master_conn()
    try:
        return jsonify({'data': b2b_service.list_orders(master, g.tenant_id, 'seller')})
    except Exception as e:
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/orders/<int:order_id>', methods=['GET'])
@require_auth('yonke.view')
def get_order(order_id):
    """Order detail (buyer or seller of that order only)."""
    master = get_master_conn()
    try:
        return jsonify(b2b_service.get_order(master, g.tenant_id, order_id))
    except Exception as e:
        return _error_response(e)
    finally:
        master.close()


@b2b_bp.route('/orders/<int:order_id>/status', methods=['PUT'])
@require_auth('yonke.manage')
def update_order_status(order_id):
    """Transition an order status (role-checked). 'received' also stocks the buyer."""
    data = request.get_json(silent=True) or {}
    master = get_master_conn()
    try:
        result = b2b_service.update_order_status(
            master, g.tenant_id, order_id, data.get('status'),
            branch_id=g.branch_id)
        return jsonify(result)
    except Exception as e:
        master.rollback()
        return _error_response(e)
    finally:
        master.close()