from django.core.management.base import BaseCommand
from core.models import AppUser, Library, Channel, MediaItem, Airing, ScheduleTemplate
from django.utils import timezone
from datetime import timedelta

class Command(BaseCommand):
    help = "Displays a beautifully formatted terminal dashboard of the current backend state."

    def get_color(self, text, code):
        """Helper to wrap string in bash color codes"""
        return f"\033[{code}m{text}\033[0m"

    def handle(self, *args, **options):
        # 1. Gather Aggregate Metrics
        total_users = AppUser.objects.count()
        total_libraries = Library.objects.count()
        total_channels = Channel.objects.count()
        total_media = MediaItem.objects.count()
        total_templates = ScheduleTemplate.objects.count()

        # Gather near-term Airing metrics
        now = timezone.now()
        tomorrow = now + timedelta(days=1)
        airings_today = Airing.objects.filter(starts_at__gte=now, starts_at__lt=tomorrow).count()
        airings_total = Airing.objects.count()
        
        self.stdout.write(self.get_color("\n=== PYTV Backend State Dashboard ===", "1;34"))
        self.stdout.write(f"\n{self.get_color('Core Metrics:', '1;36')}")
        self.stdout.write(f"  Users:        {self.get_color(str(total_users), '1;32')}")
        self.stdout.write(f"  Libraries:    {self.get_color(str(total_libraries), '1;32')}")
        self.stdout.write(f"  Media Items:  {self.get_color(str(total_media), '1;32')}")
        self.stdout.write(f"  Channels:     {self.get_color(str(total_channels), '1;32')}")
        
        self.stdout.write(f"\n{self.get_color('Scheduling Engine:', '1;36')}")
        self.stdout.write(f"  Active Templates:     {self.get_color(str(total_templates), '1;33')}")
        self.stdout.write(f"  Airings (Next 24h):   {self.get_color(str(airings_today), '1;33')}")
        self.stdout.write(f"  Airings (Total):      {self.get_color(str(airings_total), '1;33')}")
        
        # 2. Build Tree View of Channels
        self.stdout.write(f"\n{self.get_color('Channel Tree:', '1;36')}")
        
        channels = Channel.objects.prefetch_related('scheduletemplate_set').all()
        if not channels:
            self.stdout.write("  (No channels configured)")
        
        for c in channels:
            status_color = "1;32" if c.is_active else "1;31"
            status_text = "ACTIVE" if c.is_active else "INACTIVE"
            self.stdout.write(f"\n  📺 [{c.channel_number or '-'}] {c.name} ({self.get_color(status_text, status_color)})")
            
            # Show templates
            templates = c.scheduletemplate_set.filter(is_active=True).order_by('-priority')
            if not templates:
                self.stdout.write("      ⚠️  No active schedule templates.")
            else:
                for t in templates:
                    blocks_count = t.scheduleblock_set.count()
                    self.stdout.write(f"      📄 Template: {t.name} (Priority {t.priority}) -> {blocks_count} Blocks")
                    
        self.stdout.write("\n")