from rest_framework import serializers
from monitor.models import BitcoinPrice, MarketAnalysis
from django.utils import timezone


class BitcoinPriceSerializer(serializers.ModelSerializer):
    class Meta:
        model = BitcoinPrice
        fields = ['id', 'timestamp', 'price_usd', 'volume', 'market_cap']
    
    def to_representation(self, instance):
        # Convert Decimal to float for JSON
        data = super().to_representation(instance)
        data['price_usd'] = float(data['price_usd'])
        if data['volume']:
            data['volume'] = float(data['volume'])
        if data['market_cap']:
            data['market_cap'] = float(data['market_cap'])
        return data


class MarketAnalysisSerializer(serializers.ModelSerializer):
    class Meta:
        model = MarketAnalysis
        fields = ['id', 'timestamp', 'period', 'current_price', 'average_price', 
                 'min_price', 'max_price', 'status', 'threshold_percent',
                 'lower_threshold', 'upper_threshold', 'is_event', 'event_type']
    
    def to_representation(self, instance):
        # Convert Decimal to float for JSON
        data = super().to_representation(instance)
        decimal_fields = ['current_price', 'average_price', 'min_price', 'max_price',
                         'threshold_percent', 'lower_threshold', 'upper_threshold']
        for field in decimal_fields:
            if field in data and data[field]:
                data[field] = float(data[field])
        return data


class StatusResponseSerializer(serializers.Serializer):
    """Serializer for status API endpoint."""
    current_price = serializers.FloatField()
    current_status = serializers.CharField()
    yearly_average = serializers.FloatField()
    yearly_min = serializers.FloatField()
    yearly_max = serializers.FloatField()
    threshold_percent = serializers.FloatField()
    lower_threshold = serializers.FloatField()
    upper_threshold = serializers.FloatField()
    last_yearly_update = serializers.DateTimeField(allow_null=True)
    last_hourly_update = serializers.DateTimeField(allow_null=True)
    stale_yearly = serializers.BooleanField()
    stale_hourly = serializers.BooleanField()
    fetch_error = serializers.CharField(allow_null=True, allow_blank=True)


class ChartDataSerializer(serializers.Serializer):
    """Serializer for chart data API endpoint."""
    timestamps = serializers.ListField(child=serializers.DateTimeField())
    prices = serializers.ListField(child=serializers.FloatField())
    events = MarketAnalysisSerializer(many=True)
    threshold_percent = serializers.FloatField()


class HealthCheckSerializer(serializers.Serializer):
    """Serializer for health check endpoint."""
    status = serializers.CharField()
    timestamp = serializers.DateTimeField()
    checks = serializers.DictField()