from django.contrib import admin
from django.utils.translation import gettext_lazy as _
from .models import ToolCategory, Tool, ToolFavorite, CompressionHistory


@admin.register(ToolCategory)
class ToolCategoryAdmin(admin.ModelAdmin):
    list_display = ['name', 'icon', 'sort_order', 'tool_count', 'created_at']
    search_fields = ['name']
    ordering = ['sort_order']
    list_editable = ['sort_order']

    def tool_count(self, obj):
        return obj.tools.count()
    tool_count.short_description = _('Tool Count')


@admin.register(Tool)
class ToolAdmin(admin.ModelAdmin):
    list_display = ['name', 'category', 'url_path', 'color', 'usage_count', 'is_enabled', 'is_new', 'sort_order', 'created_at']
    list_filter = ['is_enabled', 'is_new', 'category']
    search_fields = ['name', 'description', 'url_path']
    ordering = ['sort_order']
    list_editable = ['is_enabled', 'is_new', 'sort_order', 'color']
    list_per_page = 20
    fieldsets = (
        (_('Basic Information'), {
            'fields': ('name', 'description', 'icon', 'url_path', 'color')
        }),
        (_('Category and Sort'), {
            'fields': ('category', 'sort_order')
        }),
        (_('Status'), {
            'fields': ('is_enabled', 'is_new', 'usage_count')
        }),
    )


@admin.register(ToolFavorite)
class ToolFavoriteAdmin(admin.ModelAdmin):
    list_display = ['user', 'tool', 'created_at']
    list_filter = ['created_at']
    search_fields = ['user__username', 'tool__name']
    ordering = ['-created_at']
    list_per_page = 30
    readonly_fields = ['created_at']


@admin.register(CompressionHistory)
class CompressionHistoryAdmin(admin.ModelAdmin):
    list_display = [
        'original_filename', 'user', 'session_id', 'compression_mode',
        'original_format', 'output_format', 'compression_ratio',
        'original_size_display', 'compressed_size_display', 'created_at'
    ]
    list_filter = ['compression_mode', 'original_format', 'output_format', 'created_at']
    search_fields = ['original_filename', 'session_id', 'user__username']
    ordering = ['-created_at']
    readonly_fields = ['created_at']
    list_per_page = 20

    def original_size_display(self, obj):
        return self._format_size(obj.original_size)
    original_size_display.short_description = _('Original Size')

    def compressed_size_display(self, obj):
        return self._format_size(obj.compressed_size)
    compressed_size_display.short_description = _('Compressed Size')

    @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"