from rest_framework import serializers
from .models import Task, TaskApplication, TaskInvitation, DeliveryRecord

class DeliveryRecordSerializer(serializers.ModelSerializer):
    class Meta:
        model = DeliveryRecord
        fields = '__all__'

class TaskApplicationSerializer(serializers.ModelSerializer):
    applicant_name = serializers.ReadOnlyField(source='applicant.nickname')
    applicant_username = serializers.ReadOnlyField(source='applicant.username')
    applicant_avatar = serializers.ReadOnlyField(source='applicant.avatar_url')
    applicant_rating = serializers.ReadOnlyField(source='applicant.rating')
    applicant_completed_tasks = serializers.ReadOnlyField(source='applicant.completed_tasks')
    task_detail = serializers.SerializerMethodField()
    is_invited = serializers.SerializerMethodField()
    delivery_records = DeliveryRecordSerializer(many=True, read_only=True)

    class Meta:
        model = TaskApplication
        fields = '__all__'
        read_only_fields = ['id', 'applicant', 'status', 'reviewed_by', 'reviewed_at', 'created_at', 'updated_at']

    def get_task_detail(self, obj):
        return {
            'id': obj.task.id,
            'title': obj.task.title,
            'budget_min': obj.task.budget_min,
            'budget_max': obj.task.budget_max,
            'status': obj.task.status,
        }

    def get_is_invited(self, obj):
        from .models import TaskInvitation
        return TaskInvitation.objects.filter(task=obj.task, expert=obj.applicant).exists()


class TaskInvitationSerializer(serializers.ModelSerializer):
    enterprise_name = serializers.ReadOnlyField(source='task.enterprise.company_name')
    enterprise_logo = serializers.ReadOnlyField(source='task.enterprise.logo_url')
    enterprise_avatar = serializers.ReadOnlyField(source='task.publisher.avatar_url')
    inviter_name = serializers.ReadOnlyField(source='task.publisher.nickname')
    enterprise_phone = serializers.ReadOnlyField(source='task.publisher.phone')
    task_title = serializers.ReadOnlyField(source='task.title')
    expert_name = serializers.ReadOnlyField(source='expert.nickname')
    expert_avatar = serializers.ReadOnlyField(source='expert.avatar_url')
    expert_phone = serializers.ReadOnlyField(source='expert.phone')

    
    class Meta:
        model = TaskInvitation
        fields = '__all__'
        read_only_fields = ['id', 'created_at', 'updated_at']


class TaskSerializer(serializers.ModelSerializer):
    applications = TaskApplicationSerializer(many=True, read_only=True)
    invitations = TaskInvitationSerializer(many=True, read_only=True)
    publisher_name = serializers.ReadOnlyField(source='publisher.nickname')
    publisher_avatar = serializers.ReadOnlyField(source='publisher.avatar_url')
    publisher_phone = serializers.ReadOnlyField(source='publisher.phone')
    enterprise_name = serializers.ReadOnlyField(source='enterprise.company_name')
    enterprise_logo = serializers.ReadOnlyField(source='enterprise.logo_url')

    class Meta:
        model = Task
        fields = '__all__'
        read_only_fields = ['id', 'publisher', 'enterprise', 'created_at', 'updated_at', 'assigned_at', 'completed_at', 'cancelled_at']