from rest_framework import serializers
from jobposting.models import JobListing, SkillLevels, CompanyLogo, Skill
from core.models import MyUser, AnonymousUserData

class SkillLevelsField(serializers.Field):
    def to_representation(self, value):
        # Konwersja do formatu wyjściowego
        return {skill_level.skill_id.skill_name: skill_level.skill_level for skill_level in value.all()}

    def to_internal_value(self, data):
        # Konwersja z formatu wejściowego
        skill_levels = []
        for skill_name, level in data.items():
            try:
                skill = Skill.objects.get(skill_name=skill_name)
            except Skill.DoesNotExist:
                raise serializers.ValidationError(f"Skill with name '{skill_name}' does not exist.")
            skill_levels.append({'skill_id': skill.id, 'skill_level': level})
        return skill_levels

class MyUserSerializer(serializers.ModelSerializer):
    class Meta:
        model = MyUser
        fields = ['id', 'email', 'first_name', 'last_name']

class AnonymousUserDataSerializer(serializers.ModelSerializer):
    class Meta:
        model = AnonymousUserData
        fields = ['id', 'email', 'first_name', 'last_name']


class SkillLevelsSerializer(serializers.ModelSerializer):
    skill_id = serializers.PrimaryKeyRelatedField(read_only=True, source='skill.id')
    class Meta:
        model = SkillLevels
        fields = ['skill_id', 'skill_level']

class JobListingSerializer(serializers.ModelSerializer):
    created_by = MyUserSerializer(read_only=True)
    anonymous_user_data = AnonymousUserDataSerializer(read_only=True)
    skill_levels = SkillLevelsField()

    class Meta:
        model = JobListing
        fields = [
            'id', 'posting_option',
            'company_name', 'name', 'content', 'minsalary', 'maxsalary',
            'localization', 'created_by', 'created_at', 'status', 'status_paid', 
            'expiration_date', 'experience_level', 'employmentType', 'workFromHome',
            'updated_at', 'skillLevels', 'contact_email', 'first_name', 'last_name',
            'anonymous_user_data' 
        ]

    def create(self, validated_data):
        skill_levels_data = validated_data.pop('skill_levels', [])
        job_listing = JobListing.objects.create(**validated_data)
        for skill_data in skill_levels_data:
            skill_level = SkillLevels.objects.create(**skill_data)
            job_listing.skillLevels.add(skill_level)
        return job_listing
    
class CompanyLogoSerializer(serializers.ModelSerializer):
    class Meta:
        model = CompanyLogo
        fields = ['id', 'company_nane','company_logo']

class SkillSerializer(serializers.ModelSerializer):
    class Meta:
        model = Skill
        fields = ['id', 'skill_name']