from __future__ import annotations

import logging
from pathlib import Path
from typing import Any, ClassVar

from django import forms
from django.contrib import admin, messages
from django.db.models import QuerySet
from django.http import HttpRequest
from django.utils.html import format_html
from django.utils.translation import gettext_lazy as _

from apps.client.models import ClientIdentityDoc

logger = logging.getLogger("apps.client")


def _get_identity_doc_service() -> Any:
    """工厂函数：获取当事人证件服务"""
    from apps.client.services.client_identity_doc_service import ClientIdentityDocService

    return ClientIdentityDocService()


class ClientIdentityDocForm(forms.ModelForm[ClientIdentityDoc]):
    """当事人证件表单"""

    file_upload = forms.FileField(
        label=_("上传文件"),
        required=False,
        help_text=_("上传后将自动重命名为：当事人名称_证件类型.扩展名"),
    )

    class Meta:
        model = ClientIdentityDoc
        fields: ClassVar = ["client", "doc_type", "file_path"]

    def __init__(self, *args: Any, **kwargs: Any) -> None:
        super().__init__(*args, **kwargs)
        if self.instance and self.instance.pk:
            self.fields["file_upload"].help_text = _("当前文件：") + Path(self.instance.file_path or "").name


@admin.register(ClientIdentityDoc)
class ClientIdentityDocAdmin(admin.ModelAdmin[ClientIdentityDoc]):
    form = ClientIdentityDocForm
    list_display = ("id", "client", "doc_type", "uploaded_at", "file_link")
    search_fields = ("client__name", "file_path")
    list_filter = ("doc_type",)
    actions = ["rename_files"]
    fields = ("client", "doc_type", "file_upload", "file_path")

    def get_queryset(self, request: HttpRequest) -> Any:
        return super().get_queryset(request).select_related("client")

    def file_link(self, obj: ClientIdentityDoc) -> str:
        url = obj.media_url
        if url:
            return format_html('<a href="{}" target="_blank">{}</a>', url, Path(obj.file_path or "").name)
        return obj.file_path or ""

    file_link.short_description = _("文件")  # type: ignore[attr-defined]

    def save_model(self, request: HttpRequest, obj: ClientIdentityDoc, form: Any, change: bool) -> None:
        """保存时处理文件上传并自动重命名"""
        service = _get_identity_doc_service()
        uploaded_file = form.cleaned_data.get("file_upload")
        if uploaded_file:
            obj.file_path = service.save_uploaded_file_to_dir(uploaded_file, rel_dir="client_identity_docs")

        super().save_model(request, obj, form, change)

        try:
            service.rename_uploaded_file(obj)
            if change:
                messages.success(request, _("文件已重命名为标准格式"))
        except Exception as e:
            messages.warning(request, _("文件重命名失败: %(error)s") % {"error": str(e)})

    def rename_files(self, request: HttpRequest, queryset: QuerySet[ClientIdentityDoc, ClientIdentityDoc]) -> None:
        """批量重命名文件"""
        service = _get_identity_doc_service()
        success_count = 0
        error_count = 0

        for obj in queryset:
            try:
                service.rename_uploaded_file(obj)
                success_count += 1
            except Exception:
                logger.exception("批量重命名文件失败", extra={"doc_id": obj.pk})
                error_count += 1

        if success_count > 0:
            messages.success(request, _("成功重命名 %(count)d 个文件") % {"count": success_count})
        if error_count > 0:
            messages.error(request, _("%(count)d 个文件重命名失败") % {"count": error_count})

    rename_files.short_description = _("重命名选中的文件")  # type: ignore[attr-defined]