import { useMutation } from "@tanstack/react-query";
import type { AxiosError } from "axios";
import { Download, FileText, Loader2, Upload } from "lucide-react";
import * as React from "react";
import { toast } from "sonner";
import { Button } from "../../../components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "../../../components/ui/dialog";
import { importOrgChart } from "../../../lib/adminApi";
import { t } from "../../../lib/i18n";

interface OrgChartUploadModalProps {
  tenantId: string;
  onSuccess?: () => void;
}

export function OrgChartUploadModal({
  tenantId,
  onSuccess,
}: OrgChartUploadModalProps) {
  const [open, setOpen] = React.useState(false);
  const [file, setFile] = React.useState<File | null>(null);
  const fileInputRef = React.useRef<HTMLInputElement>(null);

  const mutation = useMutation({
    mutationFn: (file: File) => importOrgChart(tenantId, file),
    onSuccess: () => {
      toast.success(
        t(
          "msg.admin.org.import_success",
          "조직도가 성공적으로 업로드되었습니다.",
        ),
      );
      setOpen(false);
      onSuccess?.();
    },
    onError: (error: AxiosError<{ error?: string }>) => {
      toast.error(t("msg.admin.org.import_error", "조직도 업로드 실패"), {
        description: error.response?.data?.error || error.message,
      });
    },
  });

  const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const selectedFile = e.target.files?.[0];
    if (selectedFile) {
      setFile(selectedFile);
    }
  };

  const handleUpload = () => {
    if (file) {
      mutation.mutate(file);
    }
  };

  const downloadTemplate = () => {
    const headers = "email,name,organization,position,jobtitle,is_owner";
    const example = `ceo@example.com,홍길동,경영진,대표이사,경영총괄,true
cto@example.com,이몽룡,기술부문,이사,기술총괄,true
user1@example.com,성춘향,기술부문/개발팀,팀원,프론트엔드 개발,false`;
    const blob = new Blob(
      [
        `${headers}
${example}`,
      ],
      { type: "text/csv" },
    );
    const url = URL.createObjectURL(blob);
    const a = document.createElement("a");
    a.href = url;
    a.download = "org_chart_template.csv";
    a.click();
    URL.revokeObjectURL(url);
  };

  return (
    <Dialog open={open} onOpenChange={setOpen}>
      <DialogTrigger asChild>
        <Button variant="outline" size="sm" className="gap-2">
          <Upload size={14} />
          {t("ui.admin.org.import_btn", "조직도 임포트 (CSV)")}
        </Button>
      </DialogTrigger>
      <DialogContent>
        <DialogHeader>
          <DialogTitle>
            {t("ui.admin.org.import_title", "조직도 일괄 등록")}
          </DialogTitle>
          <DialogDescription>
            {t(
              "msg.admin.org.import_description",
              "CSV 파일을 업로드하여 조직 계층과 멤버를 한 번에 구성합니다.",
            )}
          </DialogDescription>
        </DialogHeader>

        <div className="space-y-4 py-4">
          <div className="flex justify-between items-center">
            <Button
              variant="ghost"
              size="sm"
              onClick={downloadTemplate}
              className="gap-2"
            >
              <Download size={14} />
              {t("ui.admin.org.download_template", "템플릿 다운로드")}
            </Button>
            <input
              type="file"
              accept=".csv"
              className="hidden"
              ref={fileInputRef}
              onChange={handleFileChange}
            />
            <Button
              onClick={() => fileInputRef.current?.click()}
              variant="secondary"
              size="sm"
            >
              {file
                ? t("ui.common.change_file", "파일 변경")
                : t("ui.common.select_file", "파일 선택")}
            </Button>
          </div>

          {file && (
            <div className="rounded-lg border p-4 bg-muted/20 flex items-center gap-3">
              <FileText className="text-primary" />
              <div className="flex-1 min-w-0">
                <div className="font-medium truncate">{file.name}</div>
                <div className="text-xs text-muted-foreground">
                  {(file.size / 1024).toFixed(1)} KB
                </div>
              </div>
            </div>
          )}
        </div>

        <DialogFooter>
          <Button
            onClick={handleUpload}
            disabled={!file || mutation.isPending}
            className="w-full sm:w-auto"
          >
            {mutation.isPending && (
              <Loader2 size={16} className="mr-2 animate-spin" />
            )}
            {t("ui.admin.org.start_import", "임포트 시작")}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}
