from rest_framework import serializers
from django.conf import settings

from .models import Keywords, Clusters, ContentIdeas
from igny8_core.auth.models import SeedKeyword
from igny8_core.auth.serializers import SeedKeywordSerializer
from igny8_core.business.site_building.models import SiteBlueprintTaxonomy


class KeywordSerializer(serializers.ModelSerializer):
    """Serializer for Keywords model with SeedKeyword relationship"""
    # Read-only properties from seed_keyword
    keyword = serializers.CharField(read_only=True)  # From seed_keyword.keyword
    volume = serializers.IntegerField(read_only=True)  # From seed_keyword.volume or volume_override
    difficulty = serializers.IntegerField(read_only=True)  # From seed_keyword.difficulty or difficulty_override
    intent = serializers.CharField(read_only=True)  # From seed_keyword.intent
    
    # SeedKeyword relationship
    # Required for create, optional for update (can change seed_keyword or just update other fields)
    seed_keyword_id = serializers.IntegerField(write_only=True, required=False)
    seed_keyword = SeedKeywordSerializer(read_only=True)
    
    # Overrides
    volume_override = serializers.IntegerField(required=False, allow_null=True)
    difficulty_override = serializers.IntegerField(required=False, allow_null=True)
    
    # Related fields
    cluster_name = serializers.SerializerMethodField()
    sector_name = serializers.SerializerMethodField()
    site_id = serializers.IntegerField(write_only=True, required=False)
    sector_id = serializers.IntegerField(write_only=True, required=False)

    class Meta:
        model = Keywords
        fields = [
            'id',
            'seed_keyword_id',
            'seed_keyword',
            'keyword',
            'volume',
            'difficulty',
            'intent',
            'volume_override',
            'difficulty_override',
            'cluster_id',
            'cluster_name',
            'sector_name',
            'status',
            'created_at',
            'updated_at',
            'site_id',
            'sector_id',
            'account_id',
        ]
        read_only_fields = ['id', 'created_at', 'updated_at', 'account_id', 'keyword', 'volume', 'difficulty', 'intent']
    
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Only include Stage 1 fields when feature flag is enabled
        if getattr(settings, 'USE_SITE_BUILDER_REFACTOR', False):
            self.fields['attribute_values'] = serializers.JSONField(read_only=True)
    
    def validate(self, attrs):
        """Validate that seed_keyword_id is provided for create operations"""
        # For create operations, seed_keyword_id is required
        if self.instance is None and 'seed_keyword_id' not in attrs:
            raise serializers.ValidationError({'seed_keyword_id': 'This field is required when creating a keyword.'})
        return attrs
    
    def create(self, validated_data):
        """Create Keywords instance with seed_keyword"""
        seed_keyword_id = validated_data.pop('seed_keyword_id', None)
        if not seed_keyword_id:
            raise serializers.ValidationError({'seed_keyword_id': 'This field is required when creating a keyword.'})
        
        try:
            seed_keyword = SeedKeyword.objects.get(id=seed_keyword_id)
        except SeedKeyword.DoesNotExist:
            raise serializers.ValidationError({'seed_keyword_id': f'SeedKeyword with id {seed_keyword_id} does not exist'})
        
        validated_data['seed_keyword'] = seed_keyword
        return super().create(validated_data)
    
    def update(self, instance, validated_data):
        """Update Keywords instance with seed_keyword"""
        # seed_keyword_id is optional for updates - only update if provided
        if 'seed_keyword_id' in validated_data:
            seed_keyword_id = validated_data.pop('seed_keyword_id')
            try:
                seed_keyword = SeedKeyword.objects.get(id=seed_keyword_id)
                validated_data['seed_keyword'] = seed_keyword
            except SeedKeyword.DoesNotExist:
                raise serializers.ValidationError({'seed_keyword_id': f'SeedKeyword with id {seed_keyword_id} does not exist'})
        
        return super().update(instance, validated_data)
    
    def get_cluster_name(self, obj):
        """Get cluster name from Clusters model"""
        if obj.cluster_id:
            try:
                cluster = Clusters.objects.get(id=obj.cluster_id)
                return cluster.name
            except Clusters.DoesNotExist:
                return None
        return None
    
    def get_sector_name(self, obj):
        """Get sector name from Sector model"""
        if obj.sector_id:
            try:
                from igny8_core.auth.models import Sector
                sector = Sector.objects.get(id=obj.sector_id)
                return sector.name
            except Sector.DoesNotExist:
                return None
        return None


class ClusterSerializer(serializers.ModelSerializer):
    """Serializer for Clusters model"""
    sector_name = serializers.SerializerMethodField()
    site_id = serializers.IntegerField(write_only=True, required=False)
    sector_id = serializers.IntegerField(write_only=True, required=False)

    class Meta:
        model = Clusters
        fields = [
            'id',
            'name',
            'description',
            'keywords_count',
            'volume',
            'mapped_pages',
            'status',
            'sector_name',
            'created_at',
            'updated_at',
            'site_id',
            'sector_id',
            'account_id',
        ]
        read_only_fields = ['id', 'created_at', 'updated_at', 'account_id', 'keywords_count', 'volume', 'mapped_pages']
    
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Only include Stage 1 fields when feature flag is enabled
        if getattr(settings, 'USE_SITE_BUILDER_REFACTOR', False):
            self.fields['context_type'] = serializers.CharField(read_only=True)
            self.fields['context_type_display'] = serializers.SerializerMethodField()
            self.fields['dimension_meta'] = serializers.JSONField(read_only=True)
    
    def get_sector_name(self, obj):
        """Get sector name from Sector model"""
        if obj.sector_id:
            try:
                from igny8_core.auth.models import Sector
                sector = Sector.objects.get(id=obj.sector_id)
                return sector.name
            except Sector.DoesNotExist:
                return None
        return None

    def get_context_type_display(self, obj):
        """Get context type display name (only when feature flag enabled)"""
        if hasattr(obj, 'get_context_type_display'):
            return obj.get_context_type_display()
        return None
    
    def validate_name(self, value):
        """Ensure cluster name is unique within account"""
        # Uniqueness is handled at model level, but we can add additional validation here
        return value


class ContentIdeasSerializer(serializers.ModelSerializer):
    """Serializer for ContentIdeas model"""
    keyword_cluster_name = serializers.SerializerMethodField()
    sector_name = serializers.SerializerMethodField()
    site_id = serializers.IntegerField(write_only=True, required=False)
    sector_id = serializers.IntegerField(write_only=True, required=False)
    
    class Meta:
        model = ContentIdeas
        fields = [
            'id',
            'idea_title',
            'description',
            'content_structure',
            'content_type',
            'target_keywords',
            'keyword_cluster_id',
            'keyword_cluster_name',
            'sector_name',
            'status',
            'estimated_word_count',
            'created_at',
            'updated_at',
            'site_id',
            'sector_id',
            'account_id',
        ]
        read_only_fields = ['id', 'created_at', 'updated_at', 'account_id']
    
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        # Only include Stage 1 fields when feature flag is enabled
        if getattr(settings, 'USE_SITE_BUILDER_REFACTOR', False):
            self.fields['taxonomy_id'] = serializers.IntegerField(read_only=True, allow_null=True)
            self.fields['taxonomy_name'] = serializers.SerializerMethodField()
            self.fields['site_entity_type'] = serializers.CharField(read_only=True)
            self.fields['cluster_role'] = serializers.CharField(read_only=True)
    
    def get_keyword_cluster_name(self, obj):
        """Get cluster name from Clusters model"""
        if obj.keyword_cluster_id:
            try:
                cluster = Clusters.objects.get(id=obj.keyword_cluster_id)
                return cluster.name
            except Clusters.DoesNotExist:
                return None
        return None
    
    def get_sector_name(self, obj):
        """Get sector name from Sector model"""
        if obj.sector_id:
            try:
                from igny8_core.auth.models import Sector
                sector = Sector.objects.get(id=obj.sector_id)
                return sector.name
            except Sector.DoesNotExist:
                return None
        return None

    def get_taxonomy_name(self, obj):
        if obj.taxonomy_id:
            try:
                taxonomy = SiteBlueprintTaxonomy.objects.get(id=obj.taxonomy_id)
                return taxonomy.name
            except SiteBlueprintTaxonomy.DoesNotExist:
                return None
        return None