# /home/Autopartes/pos/blueprints/catalog_bp.py
"""Catalog blueprint: TecDoc vehicle navigation with local stock enrichment.

Endpoints (all under /pos/api/catalog):
  GET /brands                        — vehicle brands with parts
  GET /models?brand_id=              — models for a brand
  GET /years?model_id=               — years for a model
  GET /engines?model_id=&year_id=    — engines for model+year
  GET /categories?mye_id=            — part categories for vehicle
  GET /groups?mye_id=&category_id=   — part subcategories for vehicle+category
  GET /parts?mye_id=&group_id=       — parts with local stock enrichment
  GET /part/<part_id>                — full part detail (stock + bodegas + alternatives)
  GET /search?q=                     — smart search (part number or text)
"""

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

catalog_bp = Blueprint('catalog', __name__, url_prefix='/pos/api/catalog')


def _with_conns(fn):
    """Helper: open master + tenant connections, call fn, close both.
    fn receives (master_conn, tenant_conn, branch_id).
    """
    master = None
    tenant = None
    try:
        master = get_master_conn()
        tenant = get_tenant_conn(g.tenant_id)
        branch_id = request.args.get('branch_id', g.branch_id)
        return fn(master, tenant, branch_id)
    except Exception as e:
        return jsonify({'error': str(e)}), 500
    finally:
        if master:
            try: master.close()
            except: pass
        if tenant:
            try: tenant.close()
            except: pass


def _master_only(fn):
    """Helper: open only master connection for hierarchy endpoints."""
    master = None
    try:
        master = get_master_conn()
        return fn(master)
    except Exception as e:
        return jsonify({'error': str(e)}), 500
    finally:
        if master:
            try: master.close()
            except: pass


# ─── Hierarchy navigation (master DB only) ───

@catalog_bp.route('/brands', methods=['GET'])
@require_auth('catalog.view')
def brands():
    def _do(master):
        data = catalog_service.get_brands(master)
        return jsonify({'data': data})
    return _master_only(_do)


@catalog_bp.route('/models', methods=['GET'])
@require_auth('catalog.view')
def models():
    brand_id = request.args.get('brand_id', type=int)
    if not brand_id:
        return jsonify({'error': 'brand_id required'}), 400
    def _do(master):
        data = catalog_service.get_models(master, brand_id)
        return jsonify({'data': data})
    return _master_only(_do)


@catalog_bp.route('/years', methods=['GET'])
@require_auth('catalog.view')
def years():
    model_id = request.args.get('model_id', type=int)
    if not model_id:
        return jsonify({'error': 'model_id required'}), 400
    def _do(master):
        data = catalog_service.get_years(master, model_id)
        return jsonify({'data': data})
    return _master_only(_do)


@catalog_bp.route('/years-all', methods=['GET'])
@require_auth('catalog.view')
def years_all():
    """Get all available years (for vehicle selector dropdown)."""
    def _do(master):
        cur = master.cursor()
        cur.execute("SELECT DISTINCT id_year, year_car FROM years ORDER BY year_car DESC")
        rows = cur.fetchall()
        cur.close()
        return jsonify({'data': [{'id_year': r[0], 'year_car': r[1]} for r in rows]})
    return _master_only(_do)


@catalog_bp.route('/engines', methods=['GET'])
@require_auth('catalog.view')
def engines():
    model_id = request.args.get('model_id', type=int)
    year_id = request.args.get('year_id', type=int)
    if not model_id or not year_id:
        return jsonify({'error': 'model_id and year_id required'}), 400
    def _do(master):
        data = catalog_service.get_engines(master, model_id, year_id)
        return jsonify({'data': data})
    return _master_only(_do)


@catalog_bp.route('/categories', methods=['GET'])
@require_auth('catalog.view')
def categories():
    mye_id = request.args.get('mye_id', type=int)
    if not mye_id:
        return jsonify({'error': 'mye_id required'}), 400
    def _do(master):
        data = catalog_service.get_categories(master, mye_id)
        return jsonify({'data': data})
    return _master_only(_do)


@catalog_bp.route('/groups', methods=['GET'])
@require_auth('catalog.view')
def groups():
    mye_id = request.args.get('mye_id', type=int)
    category_id = request.args.get('category_id', type=int)
    if not mye_id or not category_id:
        return jsonify({'error': 'mye_id and category_id required'}), 400
    def _do(master):
        data = catalog_service.get_groups(master, mye_id, category_id)
        return jsonify({'data': data})
    return _master_only(_do)


# ─── Parts with stock enrichment (master + tenant) ───

@catalog_bp.route('/parts', methods=['GET'])
@require_auth('catalog.view')
def parts():
    mye_id = request.args.get('mye_id', type=int)
    group_id = request.args.get('group_id', type=int)
    page = request.args.get('page', 1, type=int)
    per_page = request.args.get('per_page', 30, type=int)
    if not mye_id or not group_id:
        return jsonify({'error': 'mye_id and group_id required'}), 400
    def _do(master, tenant, branch_id):
        result = catalog_service.get_parts(master, mye_id, group_id, tenant, branch_id, page, per_page)
        return jsonify(result)
    return _with_conns(_do)


@catalog_bp.route('/part/<int:part_id>', methods=['GET'])
@require_auth('catalog.view')
def part_detail(part_id):
    def _do(master, tenant, branch_id):
        result = catalog_service.get_part_detail(master, part_id, tenant, branch_id)
        if not result:
            return jsonify({'error': 'Part not found'}), 404
        return jsonify(result)
    return _with_conns(_do)


@catalog_bp.route('/search', methods=['GET'])
@require_auth('catalog.view')
def search():
    q = request.args.get('q', '').strip()
    if not q or len(q) < 2:
        return jsonify({'data': []})
    limit = request.args.get('limit', 50, type=int)
    def _do(master, tenant, branch_id):
        data = catalog_service.smart_search(master, q, tenant, branch_id, limit)
        return jsonify({'data': data})
    return _with_conns(_do)