"""Service Order Blueprint: workshop Kanban management.

Prefix: /pos/api/service-orders
"""

from flask import Blueprint, request, jsonify, g
from middleware import require_auth
from tenant_db import get_tenant_conn
from services.service_order_engine import (
    create_service_order, get_service_order, list_service_orders,
    update_status, add_item, update_item, remove_item,
    add_labor, update_labor, remove_labor,
    update_service_order, get_kanban_summary,
)

service_order_bp = Blueprint('service_orders', __name__, url_prefix='/pos/api/service-orders')


@service_order_bp.route('', methods=['GET'])
@require_auth()
def list_orders():
    status = request.args.get('status')
    priority = request.args.get('priority')
    customer_id = request.args.get('customer_id', type=int)
    employee_id = request.args.get('employee_id', type=int)
    page = int(request.args.get('page', 1))
    per_page = min(int(request.args.get('per_page', 50)), 200)

    conn = get_tenant_conn(g.tenant_id)
    try:
        result = list_service_orders(
            conn, status=status, branch_id=g.branch_id,
            customer_id=customer_id, priority=priority,
            employee_id=employee_id, page=page, per_page=per_page
        )
        return jsonify(result)
    finally:
        conn.close()


@service_order_bp.route('', methods=['POST'])
@require_auth()
def create_order():
    data = request.get_json() or {}
    conn = get_tenant_conn(g.tenant_id)
    try:
        result = create_service_order(conn, {
            'tenant_id': g.tenant_id,
            'branch_id': data.get('branch_id', g.branch_id),
            'customer_id': data.get('customer_id'),
            'vehicle_id': data.get('vehicle_id'),
            'priority': data.get('priority', 'normal'),
            'reception_notes': data.get('reception_notes'),
            'estimated_cost': data.get('estimated_cost'),
            'estimated_completion': data.get('estimated_completion'),
            'employee_id': data.get('employee_id'),
            'mileage_in': data.get('mileage_in'),
            'fuel_level': data.get('fuel_level'),
            'created_by': getattr(g, 'employee_id', None),
        })
        return jsonify(result), 201
    finally:
        conn.close()


@service_order_bp.route('/<int:so_id>', methods=['GET'])
@require_auth()
def get_order(so_id):
    conn = get_tenant_conn(g.tenant_id)
    try:
        order = get_service_order(conn, so_id)
        if not order:
            return jsonify({'error': 'Service order not found'}), 404
        return jsonify(order)
    finally:
        conn.close()


@service_order_bp.route('/<int:so_id>', methods=['PUT'])
@require_auth()
def update_order(so_id):
    data = request.get_json() or {}
    conn = get_tenant_conn(g.tenant_id)
    try:
        ok = update_service_order(conn, so_id, data)
        if not ok:
            return jsonify({'error': 'No fields to update'}), 400
        return jsonify({'message': 'Service order updated'})
    finally:
        conn.close()


@service_order_bp.route('/<int:so_id>/status', methods=['PUT'])
@require_auth()
def change_status(so_id):
    data = request.get_json() or {}
    new_status = data.get('status')
    if not new_status:
        return jsonify({'error': 'status is required'}), 400
    conn = get_tenant_conn(g.tenant_id)
    try:
        result = update_status(
            conn, so_id, new_status,
            changed_by=getattr(g, 'employee_id', None),
            notes=data.get('notes'),
        )
        return jsonify(result)
    except ValueError as e:
        return jsonify({'error': str(e)}), 400
    finally:
        conn.close()


# ─── Items (Parts) ─────────────────────────────

@service_order_bp.route('/<int:so_id>/items', methods=['POST'])
@require_auth()
def add_order_item(so_id):
    data = request.get_json() or {}
    conn = get_tenant_conn(g.tenant_id)
    try:
        item_id = add_item(conn, so_id, data)
        return jsonify({'id': item_id, 'message': 'Item added'}), 201
    finally:
        conn.close()


@service_order_bp.route('/items/<int:item_id>', methods=['PUT'])
@require_auth()
def update_order_item(item_id):
    data = request.get_json() or {}
    conn = get_tenant_conn(g.tenant_id)
    try:
        ok = update_item(conn, item_id, data)
        if not ok:
            return jsonify({'error': 'No fields to update'}), 400
        return jsonify({'message': 'Item updated'})
    finally:
        conn.close()


@service_order_bp.route('/items/<int:item_id>', methods=['DELETE'])
@require_auth()
def delete_order_item(item_id):
    conn = get_tenant_conn(g.tenant_id)
    try:
        remove_item(conn, item_id)
        return jsonify({'message': 'Item removed'})
    finally:
        conn.close()


# ─── Labor ─────────────────────────────

@service_order_bp.route('/<int:so_id>/labor', methods=['POST'])
@require_auth()
def add_order_labor(so_id):
    data = request.get_json() or {}
    if not data.get('description'):
        return jsonify({'error': 'description is required'}), 400
    conn = get_tenant_conn(g.tenant_id)
    try:
        labor_id = add_labor(conn, so_id, data)
        return jsonify({'id': labor_id, 'message': 'Labor added'}), 201
    finally:
        conn.close()


@service_order_bp.route('/labor/<int:labor_id>', methods=['PUT'])
@require_auth()
def update_order_labor(labor_id):
    data = request.get_json() or {}
    conn = get_tenant_conn(g.tenant_id)
    try:
        ok = update_labor(conn, labor_id, data)
        if not ok:
            return jsonify({'error': 'No fields to update'}), 400
        return jsonify({'message': 'Labor updated'})
    finally:
        conn.close()


@service_order_bp.route('/labor/<int:labor_id>', methods=['DELETE'])
@require_auth()
def delete_order_labor(labor_id):
    conn = get_tenant_conn(g.tenant_id)
    try:
        remove_labor(conn, labor_id)
        return jsonify({'message': 'Labor removed'})
    finally:
        conn.close()


# ─── Kanban Summary ─────────────────────────────

@service_order_bp.route('/kanban/summary', methods=['GET'])
@require_auth()
def kanban_summary():
    conn = get_tenant_conn(g.tenant_id)
    try:
        summary = get_kanban_summary(conn, branch_id=g.branch_id)
        return jsonify(summary)
    finally:
        conn.close()