from django.db import models
from django.core.validators import MinValueValidator, MaxValueValidator
from django.urls import reverse
from datetime import date


class Platform(models.Model):
    """Model representing different social media/content platforms"""
    
    PLATFORM_TYPES = [
        ('linkedin', 'LinkedIn'),
        ('youtube', 'YouTube'),
        ('blog', 'Blog'),
        ('instagram', 'Instagram'),
        ('twitter', 'Twitter'),
        ('facebook', 'Facebook'),
        ('tiktok', 'TikTok'),
        ('podcast', 'Podcast'),
        ('newsletter', 'Newsletter'),
        ('other', 'Other'),
    ]
    
    STATUS_CHOICES = [
        ('active', 'Active'),
        ('inactive', 'Inactive'),
        ('planning', 'Planning'),
        ('paused', 'Paused'),
    ]
    
    name = models.CharField(max_length=100, help_text="Platform name (e.g., 'LinkedIn Business')")
    platform_type = models.CharField(max_length=20, choices=PLATFORM_TYPES)
    description = models.TextField(blank=True, help_text="Brief description of this platform's purpose")
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='active')
    primary_content_type = models.CharField(
        max_length=100, 
        help_text="Main type of content for this platform (e.g., 'Articles', 'Videos', 'Posts')"
    )
    target_audience = models.CharField(
        max_length=200, 
        blank=True, 
        help_text="Target audience for this platform"
    )
    posting_frequency = models.CharField(
        max_length=100, 
        blank=True, 
        help_text="How often content is posted (e.g., 'Daily', '3x per week')"
    )
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    class Meta:
        ordering = ['name']
    
    def __str__(self):
        return f"{self.name} ({self.get_platform_type_display()})"
    
    def get_absolute_url(self):
        return reverse('platform-detail', args=[str(self.id)])
    
    @property
    def total_deliverables(self):
        return self.contentdeliverable_set.count()
    
    @property
    def committed_count(self):
        return self.contentdeliverable_set.filter(status='committed').count()
    
    @property
    def drafted_count(self):
        return self.contentdeliverable_set.filter(status='drafted').count()
    
    @property
    def published_count(self):
        return self.contentdeliverable_set.filter(status='published').count()
    
    @property
    def completion_rate(self):
        total = self.total_deliverables
        if total == 0:
            return 0
        published = self.published_count
        return round((published / total) * 100, 1)


class Strategy(models.Model):
    """Model for platform strategies containing objectives, tactics, and actions"""
    
    platform = models.ForeignKey(Platform, on_delete=models.CASCADE, related_name='strategies')
    title = models.CharField(max_length=200, help_text="Strategy title")
    objective = models.TextField(help_text="What you want to achieve")
    tactics = models.TextField(help_text="How you plan to achieve the objective")
    actions = models.TextField(help_text="Specific actions to implement the tactics")
    control = models.TextField(
        blank=True, 
        help_text="How you'll measure success and control/adjust the strategy"
    )
    priority = models.IntegerField(
        default=1,
        validators=[MinValueValidator(1), MaxValueValidator(5)],
        help_text="Priority level (1 = highest, 5 = lowest)"
    )
    start_date = models.DateField(default=date.today)
    end_date = models.DateField(blank=True, null=True)
    is_active = models.BooleanField(default=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    class Meta:
        ordering = ['priority', '-created_at']
        verbose_name_plural = 'strategies'
    
    def __str__(self):
        return f"{self.platform.name} - {self.title}"


class ContentDeliverable(models.Model):
    """Model for tracking content deliverables and their progress"""
    
    STATUS_CHOICES = [
        ('committed', 'Committed'),
        ('drafted', 'Drafted'),
        ('published', 'Published'),
        ('cancelled', 'Cancelled'),
    ]
    
    CONTENT_TYPES = [
        ('article', 'Article'),
        ('video', 'Video'),
        ('post', 'Social Media Post'),
        ('story', 'Story'),
        ('reel', 'Reel/Short Video'),
        ('carousel', 'Carousel'),
        ('infographic', 'Infographic'),
        ('podcast', 'Podcast Episode'),
        ('newsletter', 'Newsletter'),
        ('other', 'Other'),
    ]
    
    platform = models.ForeignKey(Platform, on_delete=models.CASCADE)
    title = models.CharField(max_length=200, help_text="Content title or brief description")
    content_type = models.CharField(max_length=20, choices=CONTENT_TYPES)
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='committed')
    description = models.TextField(blank=True, help_text="Detailed description of the content")
    completion_percentage = models.IntegerField(
        default=0,
        validators=[MinValueValidator(0), MaxValueValidator(100)],
        help_text="Completion progress (0-100%)"
    )
    target_date = models.DateField(blank=True, null=True, help_text="Target publication date")
    actual_date = models.DateField(blank=True, null=True, help_text="Actual publication date")
    url = models.URLField(blank=True, help_text="URL of published content")
    notes = models.TextField(blank=True, help_text="Additional notes or comments")
    tags = models.CharField(
        max_length=200, 
        blank=True, 
        help_text="Comma-separated tags (e.g., 'marketing, tutorial, beginner')"
    )
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    
    class Meta:
        ordering = ['-created_at']
    
    def __str__(self):
        return f"{self.platform.name} - {self.title} ({self.get_status_display()})"
    
    def get_absolute_url(self):
        return reverse('deliverable-detail', args=[str(self.id)])
    
    @property
    def is_overdue(self):
        if self.target_date and self.status not in ['published', 'cancelled']:
            return date.today() > self.target_date
        return False
    
    @property
    def days_until_due(self):
        if self.target_date:
            delta = self.target_date - date.today()
            return delta.days
        return None