from rest_framework.serializers import ModelSerializer, SerializerMethodField, IntegerField
from apps.orgs.models import Organization, OrganizationMembership, OrganizationInvitation, Role, RoleMembership
from apps.users.serializers import UserSerializer

class OrganizationSerializer(ModelSerializer):
    owner = UserSerializer(read_only = True)
    member_count = SerializerMethodField()
    role_count = SerializerMethodField()

    class Meta:
        model = Organization
        fields = ['id', 'uuid', 'name', 'description', 'owner', 'created_at', 'updated_at', 'member_count', 'role_count']
        read_only_fields = ['uuid', 'owner', 'created_at', 'updated_at']

    def get_member_count(self, obj):
        return obj.memberships.count()

    def get_role_count(self, obj):
        return obj.roles.count()

class OrganizationMembershipSerializer(ModelSerializer):
    user = UserSerializer(read_only = True)
    user_id = IntegerField(write_only = True, required = False)

    class Meta:
        model = OrganizationMembership
        fields = ['id', 'user', 'user_id', 'organization', 'created_at', 'updated_at']
        read_only_fields = ['organization', 'created_at', 'updated_at']

    def create(self, validated_data):
        user_id = validated_data.pop('user_id', None)
        if user_id:
            validated_data['user_id'] = user_id
        return super().create(validated_data)

class OrganizationInvitationSerializer(ModelSerializer):
    created_by = UserSerializer(read_only = True)
    invite_url = SerializerMethodField()
    is_valid = SerializerMethodField()

    class Meta:
        model = OrganizationInvitation
        fields = ['id', 'token', 'organization', 'created_by', 'expires_at', 'max_uses', 'is_active', 'invite_url', 'is_valid', 'created_at', 'updated_at', 'uses']
        read_only_fields = ['token', 'organization', 'created_by', 'max_uses', 'created_at', 'updated_at', 'uses']

    def get_invite_url(self, obj):
        request = self.context.get('request')
        if request:
            return request.build_absolute_uri(f'/invite/{obj.token}')
        return f'/invite/{obj.token}'

    def get_is_valid(self, obj):
        return obj.is_valid()

class RoleMembershipSerializer(ModelSerializer):
    user = UserSerializer(read_only = True)

    class Meta:
        model = RoleMembership
        fields = ['id', 'user', 'role', 'created_at']
        read_only_fields = ['created_at']

class RoleSerializer(ModelSerializer):
    organization = OrganizationSerializer(read_only = True)
    member_count = SerializerMethodField()

    class Meta:
        model = Role
        fields = ['id', 'uuid', 'name', 'organization', 'member_count', 'description', 'created_at', 'updated_at']
        read_only_fields = ['uuid', 'organization', 'created_at', 'updated_at']

    def get_member_count(self, obj):
        return obj.memberships.count()