from rest_framework import serializers

from progress.models import Progress, ProgressLesson
import jwt
from django.conf import settings


class ProgressSerializer(serializers.ModelSerializer):
    lessons = serializers.SerializerMethodField()

    class Meta:
        model = Progress
        fields = ('lessons', 'course_token', 'only_watch')

    @staticmethod
    def get_lessons(self):
        return [ProgressLessonSerializer(i).data for i in self.progresslesson_set.all()]


class SecureProgressSerializer(serializers.ModelSerializer):
    jwt_token = serializers.SerializerMethodField()

    class Meta:
        model = Progress
        fields = ('jwt_token', )

    @staticmethod
    def get_jwt_token(self):
        payload = {
            'lessons': [ProgressLessonSerializer(i).data for i in self.progresslesson_set.all()],
            'course_token': str(self.course_token),
            'only_watch': self.only_watch,
        }
        return jwt.encode(payload, settings.COURSE_PROGRESS_SECRET_KEY, algorithm='HS256')


class ProgressAnalyticSerializer(serializers.ModelSerializer):
    name = serializers.SerializerMethodField()
    email = serializers.SerializerMethodField()

    class Meta:
        model = Progress
        fields = ('name', 'email',)

    @staticmethod
    def get_name(self):
        return self.user.get_full_name()

    @staticmethod
    def get_email(self):
        return self.user.email


class ProgressLessonSerializer(serializers.ModelSerializer):
    teacher = serializers.SerializerMethodField()
    student = serializers.SerializerMethodField()
    course_token = serializers.SerializerMethodField()

    class Meta:
        model = ProgressLesson
        exclude = ('progress', 'checker')

    @staticmethod
    def get_teacher(self):
        return self.checker.get_full_name()

    @staticmethod
    def get_student(self):
        return {'name': self.progress.user.get_full_name(), "out_key": str(self.progress.user.out_key)}

    @staticmethod
    def get_course_token(self):
        return str(self.progress.course_token)