from django.shortcuts import render
from django.http import HttpResponse, JsonResponse
from django.db.models import F, Sum
from django.utils import timezone
from django.views.decorators.http import require_POST
from etpgrf.typograph import Typographer
from etpgrf.layout import LayoutProcessor
from etpgrf.hyphenation import Hyphenator
from .models import DailyStat


def index(request):
    # Увеличиваем счетчик просмотров главной
    try:
        today = timezone.now().date()
        stat, created = DailyStat.objects.get_or_create(date=today)
        DailyStat.objects.filter(pk=stat.pk).update(index_views=F('index_views') + 1)
    except Exception as e:
        print(f"Stat error: {e}")

    return render(request, template_name='typograph/index.html')


def get_stats_summary(request):
    """Возвращает сводную статистику."""
    # Убираем try...except для отладки
    stats = DailyStat.objects.aggregate(
        views=Sum('index_views'),
        processed=Sum('process_requests'),
        copied=Sum('copy_count'),
        chars_in=Sum('chars_in'),
        chars_out=Sum('chars_out'),
        chars_copied=Sum('chars_copied')
    )
    # print("Aggregated stats:", stats) # DEBUG
    
    # Функция для форматирования чисел с сокращениями (M, k)
    def format_large_number(num):
        if num > 1_000_000:
            return f"{num / 1_000_000:.3f}M".replace(".", ",")
        elif num > 1_000:
            return f"{num / 1_000:.2f}k".replace(".", ",")
        return str(num)

    context = {
        'views': f"{(stats['views'] or 0):,}".replace(",", " "),
        'processed': f"{(stats['processed'] or 0):,}".replace(",", " "),
        'copied': f"{(stats['copied'] or 0):,}".replace(",", " "),
        'chars_in': format_large_number(stats['chars_in'] or 0),
        'chars_out': format_large_number(stats['chars_out'] or 0),
        'chars_copied': format_large_number(stats['chars_copied'] or 0),
    }

    return render(request, 'typograph/stats_summary.html', context)


@require_POST
def track_copy(request):
    """Увеличивает счетчик копирований и количество скопированных символов."""
    try:
        char_count = int(request.POST.get('char_count', 0))
        
        today = timezone.now().date()
        stat, created = DailyStat.objects.get_or_create(date=today)
        DailyStat.objects.filter(pk=stat.pk).update(
            copy_count=F('copy_count') + 1,
            chars_copied=F('chars_copied') + char_count
        )
        return HttpResponse("OK")
    except (ValueError, TypeError):
        return HttpResponse("Invalid char_count", status=400)
    except Exception as e:
        print(f"Stat error: {e}")
        return HttpResponse("Error", status=500)


def process_text(request):
    if request.method == 'POST':
        text = request.POST.get(key='text', default='')

        # 1. Читаем базовые настройки
        langs = request.POST.get(key='langs', default='ru')

        # 2. Собираем LayoutProcessor
        layout_enabled = request.POST.get(key='layout') == 'on'
        layout_option = False
        if layout_enabled:
            process_units = request.POST.get(key='layout_units') == 'on'
            if process_units:
                custom_units = request.POST.get(key='layout_units_custom', default='').strip()
                if custom_units:
                    process_units = custom_units.split()

            layout_option = LayoutProcessor(
                langs=langs,
                process_initials_and_acronyms=request.POST.get(key='layout_initials') == 'on',
                process_units=process_units
            )

        # 3. Собираем Hyphenator
        hyphenation_enabled = request.POST.get(key='hyphenation') == 'on'
        hyphenation_option = False
        if hyphenation_enabled:
            max_len = request.POST.get(key='hyphenation_len', default='12')
            try:
                max_len = int(max_len)
            except (ValueError, TypeError):
                max_len = 12

            hyphenation_option = Hyphenator(
                langs=langs,
                max_unhyphenated_len=max_len
            )

        # 4. Читаем Sanitizer
        sanitizer_enabled = request.POST.get(key='sanitizer_enabled') == 'on'
        sanitizer_option = None
        if sanitizer_enabled:
            sanitizer_option = request.POST.get(key='sanitizer', default='etp')

        # 5. Читаем Hanging Punctuation
        hanging_enabled = request.POST.get(key='hanging_enabled') == 'on'
        hanging_option = None
        if hanging_enabled:
            hanging_option = request.POST.get(key='hanging_punctuation', default='both')

        # 6. Собираем общие опции
        options = {
            'langs': langs,
            'process_html': True,
            'quotes': request.POST.get('quotes') == 'on',
            'layout': layout_option,
            'unbreakables': request.POST.get(key='unbreakables') == 'on',
            'hyphenation': hyphenation_option,
            'symbols': request.POST.get(key='symbols') == 'on',
            'hanging_punctuation': hanging_option,
            'mode': request.POST.get(key='mode', default='mixed'),
            'sanitizer': sanitizer_option,
        }

        # --- ДИАГНОСТИКА ---
        # print("Typographer options:", options)
        # -------------------

        # Создаем экземпляр типографа
        typo = Typographer(**options)

        # Обрабатываем текст
        processed = typo.process(text)
        
        # --- СБОР СТАТИСТИКИ ---
        try:
            today = timezone.now().date()
            stat, created = DailyStat.objects.get_or_create(date=today)
            
            # Обновляем атомарные поля
            DailyStat.objects.filter(pk=stat.pk).update(
                process_requests=F('process_requests') + 1,
                chars_in=F('chars_in') + len(text),
                chars_out=F('chars_out') + len(processed),
                # total_processing_time_ms мы пока не считаем, чтобы не усложнять
            )
            
            # JSON с настройками пока не пишем, чтобы не усложнять (как договаривались)
            
        except Exception as e:
            print(f"Stat error: {e}")
        # -----------------------

        return render(
            request,
            template_name='typograph/result_fragment.html',
            context={'processed_text': processed}
        )

    return HttpResponse(status=405)