"""
PDF generatsiya view — JSON yuborasiz, PDF olasiz.
Yuborilmagan maydonlar uchun bo'sh string ('') qaytariladi —
shunda templateda {{ ... }} qoldiqlari ko'rinmaydi.
"""
import json
from django.http import HttpResponse, JsonResponse
from django.template.loader import render_to_string
from django.views.decorators.csrf import csrf_exempt
from django.views.decorators.http import require_http_methods
from weasyprint import HTML
from rest_framework import permissions, views

# Kompaniya defaultlari
COMPANY_DEFAULTS = {
    'company_name': 'SIFAT BAHOLASH',
    'membership_number': '122',
    'membership_date': '01.06.2023',
    'phone_1': '(71) 278-85-85',
    'phone_2': '(91) 585-77-77',
    'phone_3': '(90) 535-99-99',
    'email': 'sifat.baholash@gmail.com',
    'bank_account': '2020 8 000 405 309 735 001',
    'bank_mfo': '00440',
    'inn': '307 930 412',
    'director_name': 'Тураев Т.Р.',
    'appraiser_name': 'Тураев Т.Р.',
    'appraiser_certificate': '0988',
    'appraiser_certificate_date': '17.11.2021',
    'insurance_policy': '19-01-25/0000368-2025',
    'insurance_start': '30.05.2025',
    'insurance_end': '29.05.2026',
    'market_name': 'Сергели автомобил бозори',
    'city': 'Ташкент',
    'year': '2026',
    'total_pages': 21,
    'valuation_purpose': 'для обеспечения залогом',
    'valuation_purpose_full': 'определение рыночной стоимости для обеспечения залогом',
    'adj_bargaining': '-9,00%',
    'adj_tech': '2,00%',
    'adj_equipment': '3,00%',
    'cost_weight': '20',
    'comp_weight': '80',
}

# Template ichida ishlatiladigan barcha maydonlar
ALL_FIELDS = [
    'report_number', 'report_date', 'valuation_date',
    'customer_name', 'customer_short_name', 'customer_passport',
    'owner_name', 'owner_address',
    'vehicle_brand', 'vehicle_model', 'vehicle_plate',
    'vehicle_type', 'vehicle_year', 'vehicle_mileage',
    'vehicle_engine_number', 'vehicle_body_number', 'vehicle_chassis_number',
    'vehicle_color', 'vehicle_tech_passport',
    'spec_type', 'spec_seats', 'spec_length', 'spec_width', 'spec_height',
    'spec_wheelbase', 'spec_clearance',
    'engine_type', 'engine_volume', 'engine_cylinders',
    'engine_power', 'engine_torque', 'engine_max_speed',
    'engine_acceleration', 'transmission',
    'fuel_tank', 'trunk', 'curb_weight', 'gross_weight',
    'brakes_front', 'brakes_rear', 'tires',
    'cost_c0', 'cost_tf', 'cost_lf', 'cost_type_name',
    'cost_kt', 'cost_kl', 'cost_omega',
    'cost_wear_andrianov', 'cost_wear_expert', 'cost_wear_avg',
    'cost_func_wear', 'cost_total_wear', 'cost_capital',
    'cost_approach_value', 'cost_approach_value_words',
    'analog_1_source', 'analog_1_year', 'analog_1_mileage', 'analog_1_price',
    'analog_1_adj_1', 'analog_1_adj_2', 'analog_1_adj_3', 'analog_1_weight',
    'analog_2_source', 'analog_2_year', 'analog_2_mileage', 'analog_2_price',
    'analog_2_adj_1', 'analog_2_adj_2', 'analog_2_adj_3', 'analog_2_weight',
    'analog_3_source', 'analog_3_year', 'analog_3_mileage', 'analog_3_price',
    'analog_3_adj_1', 'analog_3_adj_2', 'analog_3_adj_3', 'analog_3_weight',
    'comp_total_usd', 'comp_total_sum', 'comp_total_words',
    'cost_specific', 'comp_specific', 'weighted_value',
    'market_value_number', 'market_value_words',
    'rate_rur', 'rate_usd', 'rate_eur',
    'exploitation_period', 'retail_price',
]


def _img_or_placeholder(image_url, placeholder_text, alt='', height='200mm'):
    """Rasm URL bo'lsa <img>, bo'lmasa placeholder qaytaradi"""
    if image_url:
        return f'<img src="{image_url}" alt="{alt}" style="max-width:100%;max-height:{height};">'
    return (
        f'<div class="image-placeholder" style="height: {height};">'
        f'{placeholder_text}'
        f'</div>'
    )


def build_context(data: dict) -> dict:
    """Templatedagi barcha o'zgaruvchilar uchun qiymat tayyorlaydi"""
    # 1) Barcha maydonlarni bo'sh string bilan to'ldirish
    context = {field: '' for field in ALL_FIELDS}

    # 2) Kompaniya defaultlari
    context.update(COMPANY_DEFAULTS)

    # 3) Foydalanuvchi yuborgan ma'lumotlarni ustiga yozish
    context.update(data)

    # 4) Rasmlar uchun tayyor HTML
    context['cover_photo_html'] = _img_or_placeholder(
        data.get('vehicle_photo'),
        '[ Фото автомобиля ]',
        alt='Vehicle',
        height='50mm',
    )
    context['customer_passport_html'] = _img_or_placeholder(
        data.get('customer_passport_image'),
        '[ Изображение паспорта заказчика ]',
        alt='Паспорт заказчика',
    )
    context['tech_passport_html'] = _img_or_placeholder(
        data.get('tech_passport_image'),
        '[ Изображение технического паспорта ]',
        alt='Технический паспорт',
    )
    context['price_list_html'] = _img_or_placeholder(
        data.get('price_list_image'),
        '[ Прайс-лист завода-изготовителя ]',
        alt='Прайс-лист',
    )

    # 5) Loop maydonlar
    if not context.get('analog_screenshots'):
        context['analog_screenshots'] = [
            {'page_num': 18, 'image': None},
            {'page_num': 19, 'image': None},
            {'page_num': 20, 'image': None},
        ]
    if not context.get('vehicle_photos'):
        context['vehicle_photos'] = []

    return context


class GenerateApiView(views.APIView):
    
    def post(self, request):
    
        try:
            html_string = render_to_string('report_template.html', context)
            pdf_bytes = HTML(string=html_string).write_pdf()
        except Exception as e:
            return JsonResponse({'error': f'PDF yaratishda xato: {str(e)}'}, status=500)
    
        filename = f'otchet_1.pdf'
    
        response = HttpResponse(pdf_bytes, content_type='application/pdf')
        response['Content-Disposition'] = f'attachment; filename="{filename}"'
        return response