"""
Admin configuration for rfiles.online file management.
"""

from django import forms
from django.contrib import admin
from django.utils.html import format_html

from .models import MediaFile, PublicShare, FileAccessLog, SharedSpace


class SharedSpaceAdminForm(forms.ModelForm):
    password = forms.CharField(
        widget=forms.PasswordInput,
        required=False,
        help_text="Leave blank to keep existing password. Set to change."
    )

    class Meta:
        model = SharedSpace
        fields = '__all__'
        exclude = ['password_hash']

    def save(self, commit=True):
        instance = super().save(commit=False)
        password = self.cleaned_data.get('password')
        if password:
            instance.set_password(password)
        if commit:
            instance.save()
        return instance


@admin.register(SharedSpace)
class SharedSpaceAdmin(admin.ModelAdmin):
    form = SharedSpaceAdminForm
    list_display = [
        'name',
        'slug',
        'url_display',
        'file_count_display',
        'total_size_display',
        'is_active',
        'created_at',
    ]
    list_filter = ['is_active', 'created_at']
    search_fields = ['name', 'slug', 'description']
    readonly_fields = ['id', 'created_at', 'updated_at', 'url_display', 'file_count_display', 'total_size_display']
    fieldsets = (
        (None, {
            'fields': ('id', 'name', 'slug', 'description', 'url_display')
        }),
        ('Access Control', {
            'fields': ('password', 'is_active', 'max_file_size_mb')
        }),
        ('Statistics', {
            'fields': ('file_count_display', 'total_size_display')
        }),
        ('Metadata', {
            'fields': ('created_by', 'created_at', 'updated_at')
        }),
    )

    def url_display(self, obj):
        url = obj.get_url()
        return format_html('<a href="{}" target="_blank">{}</a>', url, url)
    url_display.short_description = 'URL'

    def file_count_display(self, obj):
        return obj.file_count
    file_count_display.short_description = 'Files'

    def total_size_display(self, obj):
        size = obj.total_size_bytes
        for unit in ['B', 'KB', 'MB', 'GB']:
            if size < 1024:
                return f"{size:.1f} {unit}"
            size /= 1024
        return f"{size:.1f} TB"
    total_size_display.short_description = 'Total Size'


@admin.register(MediaFile)
class MediaFileAdmin(admin.ModelAdmin):
    list_display = [
        'title',
        'original_filename',
        'mime_type',
        'formatted_file_size',
        'share_count',
        'is_processed',
        'created_at',
    ]
    list_filter = ['mime_type', 'is_processed', 'created_at']
    search_fields = ['title', 'original_filename', 'description', 'tags']
    readonly_fields = ['id', 'file_hash', 'file_size', 'created_at', 'updated_at', 'share_links']
    fieldsets = (
        (None, {
            'fields': ('id', 'title', 'description', 'tags')
        }),
        ('File Info', {
            'fields': ('file', 'original_filename', 'mime_type', 'file_size', 'file_hash')
        }),
        ('Processing', {
            'fields': ('is_processed', 'processing_error', 'extracted_text'),
            'classes': ('collapse',)
        }),
        ('Links', {
            'fields': ('shared_space',),
            'classes': ('collapse',)
        }),
        ('Metadata', {
            'fields': ('uploaded_by', 'created_at', 'updated_at')
        }),
        ('Public Shares', {
            'fields': ('share_links',)
        }),
    )

    def formatted_file_size(self, obj):
        size = obj.file_size
        for unit in ['B', 'KB', 'MB', 'GB']:
            if size < 1024:
                return f"{size:.1f} {unit}"
            size /= 1024
        return f"{size:.1f} TB"
    formatted_file_size.short_description = 'Size'

    def share_count(self, obj):
        count = obj.get_public_shares().count()
        if count > 0:
            return format_html('<span style="color: green;">{}</span>', count)
        return count
    share_count.short_description = 'Active Shares'

    def share_links(self, obj):
        shares = obj.get_public_shares()
        if not shares:
            return "No active shares"

        links = []
        for share in shares:
            url = share.get_public_url()
            status_parts = []
            if share.expires_at:
                status_parts.append(f"expires {share.expires_at}")
            if share.max_downloads:
                status_parts.append(f"{share.download_count}/{share.max_downloads} downloads")
            if share.is_password_protected:
                status_parts.append("password protected")

            status_str = f" ({', '.join(status_parts)})" if status_parts else ""
            links.append(f'<a href="{url}" target="_blank">{share.token[:12]}...</a>{status_str}')

        return format_html('<br>'.join(links))
    share_links.short_description = 'Share Links'


@admin.register(PublicShare)
class PublicShareAdmin(admin.ModelAdmin):
    list_display = [
        'token_display',
        'media_file',
        'status_display',
        'download_count',
        'is_password_protected',
        'expires_at',
        'created_at',
    ]
    list_filter = ['is_active', 'is_password_protected', 'created_at', 'expires_at']
    search_fields = ['token', 'media_file__title', 'media_file__original_filename', 'note']
    readonly_fields = ['id', 'token', 'download_count', 'created_at', 'public_url_display']
    fieldsets = (
        (None, {
            'fields': ('id', 'token', 'media_file', 'public_url_display')
        }),
        ('Access Control', {
            'fields': ('is_active', 'expires_at', 'max_downloads', 'download_count')
        }),
        ('Password Protection', {
            'fields': ('is_password_protected', 'password_hash'),
            'classes': ('collapse',)
        }),
        ('Metadata', {
            'fields': ('note', 'created_by', 'created_at')
        }),
    )

    def token_display(self, obj):
        return f"{obj.token[:16]}..."
    token_display.short_description = 'Token'

    def status_display(self, obj):
        if not obj.is_active:
            return format_html('<span style="color: red;">Revoked</span>')
        if obj.is_expired:
            return format_html('<span style="color: orange;">Expired</span>')
        if obj.is_download_limit_reached:
            return format_html('<span style="color: orange;">Limit Reached</span>')
        return format_html('<span style="color: green;">Active</span>')
    status_display.short_description = 'Status'

    def public_url_display(self, obj):
        url = obj.get_public_url()
        return format_html('<a href="{}" target="_blank">{}</a>', url, url)
    public_url_display.short_description = 'Public URL'


@admin.register(FileAccessLog)
class FileAccessLogAdmin(admin.ModelAdmin):
    list_display = [
        'accessed_at',
        'media_file',
        'access_type',
        'ip_address',
        'share_token_display',
    ]
    list_filter = ['access_type', 'accessed_at']
    search_fields = ['media_file__title', 'ip_address']
    readonly_fields = [
        'id', 'media_file', 'share', 'accessed_at',
        'ip_address', 'user_agent', 'access_type', 'user',
    ]

    def share_token_display(self, obj):
        if obj.share:
            return f"{obj.share.token[:12]}..."
        return "-"
    share_token_display.short_description = 'Share'

    def has_add_permission(self, request):
        return False

    def has_change_permission(self, request, obj=None):
        return False