import type { LibraryRoot, NamingKind, NamingOverride, NamingTemplatesView } from "@umt/contracts";
import { Save, Trash2 } from "lucide-react";
import { useEffect, useState } from "react";
import { toast } from "sonner";
import { useLibraryRoots } from "~/api/library.ts";
import { useNamingTemplates, useSaveGlobalNaming, useSaveRootNaming } from "~/api/naming.ts";
import { ErrorState, LoadingState } from "~/components/console/empty-state.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { NAMING_KINDS, overrideBody, SOURCE_LABEL, splitNamingErrors } from "~/components/naming/model.ts";
import { NAMING_KIND_LABEL, NAMING_NOTE, NamingTemplateEditor } from "~/components/naming/template-editor.tsx";
import { Button } from "~/components/ui/button.tsx";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "~/components/ui/select.tsx";
import { Switch } from "~/components/ui/switch.tsx";
import { errorMessage } from "~/lib/api.ts";
import { SaveBar, SettingsBlock } from "./settings-block.tsx";

// 设置 → 媒体库与目录 → 命名模板:全局模板 + 库根覆盖(作品覆盖在作品详情)。

const KINDS = NAMING_KINDS;

export function NamingSection() {
  return (
    <>
      <GlobalNaming />
      <RootNaming />
    </>
  );
}

function GlobalNaming() {
  const q = useNamingTemplates();
  const save = useSaveGlobalNaming();
  const [draft, setDraft] = useState<Record<NamingKind, string> | null>(null);
  const [lock, setLock] = useState(false);
  const [errors, setErrors] = useState<Partial<Record<NamingKind, string>> | undefined>();

  useEffect(() => {
    if (q.data && !draft) {
      setDraft({ movie: q.data.global.movie, tv: q.data.global.tv, variety: q.data.global.variety });
      setLock(q.data.global.lockFileNameForBound);
    }
  }, [q.data, draft]);

  const saved = q.data?.global;
  const dirtyKinds = Object.fromEntries(KINDS.map((k) => [k, !!saved && !!draft && draft[k] !== saved[k]]));
  const dirty = KINDS.some((k) => dirtyKinds[k]) || (!!saved && lock !== saved.lockFileNameForBound);

  const onSave = async () => {
    if (!draft) return;
    setErrors(undefined);
    try {
      const r = await save.mutateAsync({ ...draft, lockFileNameForBound: lock });
      setDraft({ movie: r.movie, tv: r.tv, variety: r.variety });
      setLock(r.lockFileNameForBound);
      toast.success("已保存「命名模板」");
    } catch (err) {
      const split = splitNamingErrors(errorMessage(err));
      if (split) setErrors(split);
      toast.error(split ? "模板有错误，未保存" : errorMessage(err, "保存失败"));
    }
  };

  return (
    <SettingsBlock section="library" anchor="naming" title="命名模板" description={NAMING_NOTE} dirty={dirty}>
      {!q.data || !draft ? (
        q.isError ? (
          <ErrorState plain error={q.error} onRetry={() => q.refetch()} />
        ) : (
          <LoadingState rows={4} />
        )
      ) : (
        <div className="space-y-5">
          <NamingTemplateEditor
            kinds={KINDS}
            values={draft}
            onChange={(k, v) => {
              setDraft((d) => (d ? { ...d, [k]: v } : d));
              setErrors((e) => (e?.[k] ? { ...e, [k]: undefined } : e));
            }}
            defaults={q.data.defaults}
            saveErrors={errors}
            dirtyKinds={dirtyKinds}
          />
          <label
            htmlFor="naming-lock-filename"
            className="flex cursor-pointer items-start justify-between gap-4 border-t border-border/60 pt-4"
          >
            <span className="min-w-0">
              <span className="block text-body text-foreground">已有目录的作品固定文件名</span>
              <span className="block text-meta text-muted-foreground">
                开启后，这些作品的新文件按建立目录时的模板版本命名
              </span>
            </span>
            <Switch
              id="naming-lock-filename"
              checked={lock}
              onCheckedChange={setLock}
              aria-label="已有目录的作品固定文件名"
            />
          </label>
          <SaveBar dirty={dirty}>
            <Button size="sm" onClick={onSave} disabled={!dirty || save.isPending || !draft}>
              <Save />
              {save.isPending ? "保存中…" : "保存"}
            </Button>
          </SaveBar>
        </div>
      )}
    </SettingsBlock>
  );
}

function RootNaming() {
  const roots = useLibraryRoots();
  const [rootId, setRootId] = useState("");
  const list = roots.data?.items ?? [];
  const root = list.find((r) => r.id === rootId) ?? list[0];

  return (
    <SettingsBlock
      section="library"
      anchor="naming-roots"
      title="目录命名覆盖"
      description="按类型覆盖全局模板；留空的类型沿用全局。"
    >
      {roots.isPending ? (
        <LoadingState rows={2} />
      ) : roots.isError ? (
        <ErrorState plain error={roots.error} onRetry={() => roots.refetch()} />
      ) : !root ? (
        <p className="text-caption text-muted-foreground">还没有媒体库目录。先在上方「媒体库目录」添加。</p>
      ) : (
        <div className="space-y-4">
          <div className="flex flex-wrap items-center gap-2">
            <Select value={root.id} onValueChange={setRootId}>
              <SelectTrigger size="sm" aria-label="媒体库目录" className="max-w-full min-w-48">
                <SelectValue />
              </SelectTrigger>
              <SelectContent position="popper">
                {list.map((r) => (
                  <SelectItem key={r.id} value={r.id}>
                    {r.name}
                    {r.naming && Object.keys(r.naming).length ? "（已覆盖）" : ""}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
            <span className="min-w-0 truncate font-mono text-meta text-muted-foreground">{root.localPath}</span>
          </div>
          <RootNamingEditor key={root.id} root={root} />
        </div>
      )}
    </SettingsBlock>
  );
}

function RootNamingEditor({ root }: { root: LibraryRoot }) {
  const q = useNamingTemplates({ libraryRootId: root.id });
  const save = useSaveRootNaming();
  const [draft, setDraft] = useState<Partial<Record<NamingKind, string>> | null>(null);
  const [errors, setErrors] = useState<Partial<Record<NamingKind, string>> | undefined>();

  useEffect(() => {
    if (q.data && !draft) setDraft({ ...(q.data.root ?? {}) });
  }, [q.data, draft]);

  if (q.isError) return <ErrorState plain error={q.error} onRetry={() => q.refetch()} />;
  if (q.isPending || !draft) return <LoadingState rows={3} />;
  const view: NamingTemplatesView = q.data;
  const saved = view.root ?? {};
  const dirtyKinds = Object.fromEntries(KINDS.map((k) => [k, (draft[k] ?? "") !== (saved[k] ?? "")]));
  const dirty = KINDS.some((k) => dirtyKinds[k]);
  const hasOverride = !!view.root && Object.keys(view.root).length > 0;

  const put = async (body: NamingOverride | null) => {
    setErrors(undefined);
    try {
      await save.mutateAsync({ id: root.id, naming: body });
      setDraft({ ...(body ?? {}) });
      toast.success(body ? "已保存「目录命名覆盖」" : "已清除「目录命名覆盖」");
    } catch (err) {
      const split = splitNamingErrors(errorMessage(err));
      if (split) setErrors(split);
      toast.error(split ? "模板有错误，未保存" : errorMessage(err, "保存失败"));
    }
  };

  return (
    <div className="space-y-4">
      <div className="flex flex-wrap items-center gap-2">
        {KINDS.map((k) => (
          <StatusBadge key={k} tone={saved[k] ? "success" : "neutral"}>
            {NAMING_KIND_LABEL[k]}:{saved[k] ? "媒体库目录覆盖" : "沿用全局"}
          </StatusBadge>
        ))}
      </div>
      <NamingTemplateEditor
        kinds={KINDS}
        values={draft}
        onChange={(k, v) => {
          setDraft((d) => ({ ...d, [k]: v }));
          setErrors((e) => (e?.[k] ? { ...e, [k]: undefined } : e));
        }}
        defaults={view.defaults}
        inherited={Object.fromEntries(KINDS.map((k) => [k, { template: view.global[k], source: SOURCE_LABEL.global }]))}
        libraryRootId={root.id}
        saveErrors={errors}
        dirtyKinds={dirtyKinds}
      />
      <SaveBar dirty={dirty}>
        <Button
          variant="ghost"
          size="sm"
          className="hover:text-destructive"
          disabled={!hasOverride || save.isPending}
          onClick={() => put(null)}
        >
          <Trash2 />
          清除覆盖
        </Button>
        <Button size="sm" disabled={!dirty || save.isPending} onClick={() => put(overrideBody(draft))}>
          <Save />
          {save.isPending ? "保存中…" : "保存覆盖"}
        </Button>
      </SaveBar>
    </div>
  );
}