import { type PathMapping, PathMappingCreate } from "@umt/contracts";
import { LoaderCircle, Plus, ShieldCheck, Trash2 } from "lucide-react";
import { useState } from "react";
import { toast } from "sonner";
import { libraryRoots, pathMappings } from "~/api/instances.ts";
import { ConfirmDialog } from "~/components/console/confirm-dialog.tsx";
import { DetailSection } from "~/components/console/detail-sheet.tsx";
import { zodFieldErrors } from "~/components/console/form-field.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { Button } from "~/components/ui/button.tsx";
import { errorMessage } from "~/lib/api.ts";
import { healthLabel } from "~/lib/labels.ts";
import { FieldControl, type FormValues, num, str } from "./resource-section.tsx";

// 实例抽屉里的路径映射:只列本实例的映射,可新增、校验、删除。
// 对方看到的路径前缀 → 本进程可访问的前缀;前缀越长越优先,同长按优先级。

const EMPTY: FormValues = { remotePrefix: "", localPrefix: "", libraryRootId: "none", priority: "0" };

export function PathMappingsPanel({
  viewKind,
  instanceId,
}: {
  viewKind: "downloader" | "media_server";
  instanceId: string;
}) {
  const list = pathMappings.useList();
  const create = pathMappings.useCreate();
  const remove = pathMappings.useRemove();
  const verify = pathMappings.useVerify();
  const roots = libraryRoots.useList();
  const [adding, setAdding] = useState(false);
  const [v, setV] = useState<FormValues>(EMPTY);
  const [errors, setErrors] = useState<Record<string, string>>({});
  const [deleting, setDeleting] = useState<PathMapping | null>(null);

  const rows = (list.data?.items ?? []).filter((m) =>
    viewKind === "downloader" ? m.downloaderInstanceId === instanceId : m.mediaServerInstanceId === instanceId,
  );
  const rootOpts = [
    { value: "none", label: "不关联" },
    ...(roots.data?.items ?? []).map((d) => ({ value: d.id, label: d.name })),
  ];
  const rootName = (id: string | null) => roots.data?.items.find((r) => r.id === id)?.name;

  const submit = async (e: React.FormEvent) => {
    e.preventDefault();
    const root = str(v.libraryRootId);
    const parsed = PathMappingCreate.safeParse({
      viewKind,
      downloaderInstanceId: viewKind === "downloader" ? instanceId : null,
      mediaServerInstanceId: viewKind === "media_server" ? instanceId : null,
      remotePrefix: str(v.remotePrefix),
      localPrefix: str(v.localPrefix),
      libraryRootId: root && root !== "none" ? root : null,
      priority: num(v.priority) ?? 0,
      enabled: true,
    });
    if (!parsed.success) {
      const fe = zodFieldErrors(parsed.error.issues);
      if (fe.localPrefix) fe.localPrefix = "填以 / 开头的绝对路径";
      if (fe.remotePrefix) fe.remotePrefix = "必填";
      setErrors(fe);
      return;
    }
    setErrors({});
    try {
      await create.mutateAsync(parsed.data as never);
      toast.success("路径映射已添加");
      setV(EMPTY);
      setAdding(false);
    } catch (err) {
      toast.error(errorMessage(err, "添加失败"));
    }
  };

  return (
    <DetailSection
      title="路径映射"
      actions={
        adding ? null : (
          <Button variant="outline" size="xs" onClick={() => setAdding(true)}>
            <Plus />
            添加映射
          </Button>
        )
      }
    >
      <p className="mb-2 text-meta text-muted-foreground">
        把{viewKind === "downloader" ? "下载器" : "媒体服务器"}
        看到的路径换成本服务能访问的路径。前缀越长越优先，同长比优先级。
      </p>
      {list.isPending ? (
        <p className="text-caption text-muted-foreground">加载中…</p>
      ) : rows.length === 0 ? (
        <p className="text-caption text-muted-foreground">还没有映射，路径两边一致时不用加。</p>
      ) : (
        <ul className="divide-y divide-border/60 rounded-lg border border-border/60">
          {rows.map((m) => {
            const h = healthLabel(m.verifyStatus);
            return (
              <li key={m.id} className="flex items-center gap-2 px-3 py-2">
                <div className="min-w-0 flex-1 font-mono text-meta">
                  <p className="truncate">{m.remotePrefix}</p>
                  <p className="truncate text-muted-foreground">→ {m.localPrefix}</p>
                  {rootName(m.libraryRootId) ? (
                    <p className="font-sans text-muted-foreground">媒体库目录：{rootName(m.libraryRootId)}</p>
                  ) : null}
                </div>
                <StatusBadge tone={h.tone}>{h.label}</StatusBadge>
                <Button
                  variant="ghost"
                  size="icon-sm"
                  aria-label="校验映射"
                  title="校验"
                  disabled={verify.isPending}
                  onClick={async () => {
                    try {
                      const r = await verify.mutateAsync(m.id);
                      if (r.verifyStatus === "ok") toast.success("映射可用");
                      else toast.error(String(r.verifyDetail?.message ?? "本地前缀不可访问"));
                    } catch (err) {
                      toast.error(errorMessage(err, "校验失败"));
                    }
                  }}
                >
                  <ShieldCheck />
                </Button>
                <Button
                  variant="ghost"
                  size="icon-sm"
                  aria-label="删除映射"
                  className="hover:text-destructive"
                  onClick={() => setDeleting(m)}
                >
                  <Trash2 />
                </Button>
              </li>
            );
          })}
        </ul>
      )}
      {adding ? (
        <form
          onSubmit={submit}
          noValidate
          className="mt-3 grid gap-x-3 gap-y-1 rounded-lg border border-border/60 p-3 sm:grid-cols-2"
        >
          <FieldControl
            spec={{
              name: "remotePrefix",
              label: "对方路径前缀",
              kind: "text",
              required: true,
              placeholder: "/downloads",
              wide: true,
            }}
            value={v.remotePrefix}
            error={errors.remotePrefix}
            onChange={(x) => setV((s) => ({ ...s, remotePrefix: x }))}
            disabled={create.isPending}
          />
          <FieldControl
            spec={{
              name: "localPrefix",
              label: "本地路径前缀",
              kind: "text",
              required: true,
              placeholder: "/mnt/cache/downloads",
              wide: true,
            }}
            value={v.localPrefix}
            error={errors.localPrefix}
            onChange={(x) => setV((s) => ({ ...s, localPrefix: x }))}
            disabled={create.isPending}
          />
          <FieldControl
            spec={{ name: "libraryRootId", label: "关联媒体库目录", kind: "select", options: rootOpts }}
            value={v.libraryRootId}
            onChange={(x) => setV((s) => ({ ...s, libraryRootId: x }))}
            disabled={create.isPending}
          />
          <FieldControl
            spec={{ name: "priority", label: "优先级", kind: "number", hint: "数字大的优先" }}
            value={v.priority}
            error={errors.priority}
            onChange={(x) => setV((s) => ({ ...s, priority: x }))}
            disabled={create.isPending}
          />
          <div className="flex gap-2 sm:col-span-2">
            <Button type="submit" size="sm" disabled={create.isPending}>
              {create.isPending ? <LoaderCircle className="animate-spin" /> : null}
              添加
            </Button>
            <Button
              type="button"
              variant="ghost"
              size="sm"
              onClick={() => {
                setAdding(false);
                setErrors({});
              }}
            >
              取消
            </Button>
          </div>
        </form>
      ) : null}
      <ConfirmDialog
        open={!!deleting}
        onOpenChange={(o) => !o && setDeleting(null)}
        title="删除路径映射？"
        description="依赖这条映射的路径换算会失效，磁盘文件不动。"
        confirmLabel="删除映射"
        destructive
        onConfirm={async () => {
          if (!deleting) return;
          try {
            await remove.mutateAsync(deleting.id);
            toast.success("路径映射已删除");
          } catch (err) {
            toast.error(errorMessage(err, "删除失败"));
            throw err;
          }
        }}
      />
    </DetailSection>
  );
}