from rest_framework import serializers
from .models import LeistungstestTemplate, LeistungstestTemplateExercise, LeistungstestResult, LeistungstestResultItem


class LeistungstestTemplateExerciseSerializer(serializers.ModelSerializer):
    exercise_name = serializers.CharField(source='exercise.name', read_only=True)

    class Meta:
        model = LeistungstestTemplateExercise
        fields = ['id', 'exercise', 'exercise_name', 'target_reps', 'order']


class LeistungstestTemplateSerializer(serializers.ModelSerializer):
    exercises = LeistungstestTemplateExerciseSerializer(many=True, read_only=True)
    usage_count = serializers.IntegerField(read_only=True)

    class Meta:
        model = LeistungstestTemplate
        fields = ['id', 'name', 'exercises', 'usage_count', 'created_at']


class LeistungstestResultItemSerializer(serializers.ModelSerializer):
    exercise_name = serializers.CharField(source='exercise.name', read_only=True)

    class Meta:
        model = LeistungstestResultItem
        fields = ['id', 'exercise', 'exercise_name', 'target_reps', 'actual_reps', 'elapsed_seconds', 'order']


class LeistungstestResultSerializer(serializers.ModelSerializer):
    items = LeistungstestResultItemSerializer(many=True, read_only=True)
    template_name = serializers.CharField(source='template.name', read_only=True)
    wrestler_name = serializers.CharField(source='wrestler.__str__', read_only=True)
    score_percent = serializers.FloatField(read_only=True)
    total_time_minutes = serializers.SerializerMethodField()

    class Meta:
        model = LeistungstestResult
        fields = ['id', 'template', 'template_name', 'wrestler', 'wrestler_name', 
                  'total_time_minutes', 'total_time_seconds', 'rating', 'notes', 'completed_at', 
                  'score_percent', 'items', 'created_at']
        read_only_fields = ['total_time_minutes']

    def get_total_time_minutes(self, obj):
        if obj.total_time_seconds is None:
            return None
        return obj.total_time_seconds // 60

    def validate_total_time_seconds(self, value):
        if value is not None and value < 0:
            raise serializers.ValidationError("Zeit muss positiv sein.")
        return value