from rest_framework import serializers
from .models import CompressionHistory, ToolCategory, Tool, ColorHistory


class ToolCategorySerializer(serializers.ModelSerializer):
    tool_count = serializers.SerializerMethodField()

    class Meta:
        model = ToolCategory
        fields = ['id', 'name', 'icon', 'sort_order', 'tool_count', 'created_at']

    def get_tool_count(self, obj):
        return obj.tools.filter(is_enabled=True).count()


class ToolSerializer(serializers.ModelSerializer):
    category_name = serializers.CharField(source='category.name', read_only=True, default='')

    class Meta:
        model = Tool
        fields = [
            'id', 'name', 'description', 'icon', 'url_path', 'color',
            'category', 'category_name', 'is_enabled', 'is_new',
            'usage_count', 'sort_order', 'created_at', 'updated_at'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']


class CompressionHistorySerializer(serializers.ModelSerializer):
    original_size_display = serializers.SerializerMethodField()
    compressed_size_display = serializers.SerializerMethodField()
    created_at_display = serializers.SerializerMethodField()

    class Meta:
        model = CompressionHistory
        fields = [
            'id', 'original_filename', 'original_size', 'compressed_size',
            'compression_ratio', 'original_format', 'output_format',
            'compression_mode', 'quality', 'created_at', 'file_path',
            'original_size_display', 'compressed_size_display', 'created_at_display'
        ]
        read_only_fields = ['id', 'created_at']

    def get_original_size_display(self, obj):
        return self._format_size(obj.original_size)

    def get_compressed_size_display(self, obj):
        return self._format_size(obj.compressed_size)

    def get_created_at_display(self, obj):
        return obj.created_at.strftime('%Y-%m-%d %H:%M:%S')

    @staticmethod
    def _format_size(size_bytes):
        if size_bytes < 1024:
            return f"{size_bytes} B"
        elif size_bytes < 1024 * 1024:
            return f"{size_bytes / 1024:.1f} KB"
        else:
            return f"{size_bytes / (1024 * 1024):.1f} MB"


class ImageCompressRequestSerializer(serializers.Serializer):
    file = serializers.FileField()
    mode = serializers.ChoiceField(choices=['lossy', 'lossless'], default='lossy')
    quality = serializers.IntegerField(min_value=1, max_value=100, default=80)
    format = serializers.ChoiceField(
        choices=['jpeg', 'png', 'webp', 'avif', 'original'],
        default='original'
    )
    keep_exif = serializers.BooleanField(default=True)
    width = serializers.IntegerField(required=False, min_value=1, max_value=10000)
    height = serializers.IntegerField(required=False, min_value=1, max_value=10000)
    maintain_aspect_ratio = serializers.BooleanField(default=True)


class ColorHistorySerializer(serializers.ModelSerializer):
    class Meta:
        model = ColorHistory
        fields = ['id', 'color', 'created_at']
        read_only_fields = ['id', 'created_at']


class ColorHistorySyncSerializer(serializers.Serializer):
    colors = serializers.ListField(
        child=serializers.CharField(max_length=7),
        help_text='颜色HEX值列表，如 ["#FF5733", "#33FF57"]'
    )