import { type FeedPurpose, type FeedSource, redactUrl, type Site, type SiteAccount } from "@umt/contracts";
import { CheckCircle2, CircleAlert, Loader2 } from "lucide-react";
import { useEffect, useState } from "react";
import { feedHostKey, feedWindowCount, useCreateFeed, useFeed, useFetchFeedNow } from "~/api/feeds.ts";
import { FormField } from "~/components/console/form-field.tsx";
import { Button } from "~/components/ui/button.tsx";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "~/components/ui/dialog.tsx";
import { Input } from "~/components/ui/input.tsx";
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "~/components/ui/select.tsx";
import { errorMessage } from "~/lib/api.ts";
import { cn } from "~/lib/utils.ts";

// 站点内添加 RSS:站点固定,账号 / 解析器 / 轮询由服务端按站点带出;只填地址、用途、可选备注。
// 保存后立即抓一次,在对话框里等结果(条目数或错误)。

const PURPOSES: { value: FeedPurpose; label: string; hint: string }[] = [
  { value: "generic", label: "发现", hint: "全站新种，进入识别和收录评估" },
  { value: "search", label: "追踪", hint: "按关键词、分类或收藏筛过的 RSS" },
  { value: "promotion", label: "促销", hint: "只含免费 / 促销资源的 RSS" },
];

/** 首抓最多等 90 秒(站点限流排队);超时后提示去列表看 */
const WAIT_MS = 90_000;

function defaultAccount(accounts: SiteAccount[]): string {
  return (accounts.find((a) => a.hasPasskey || a.authKind === "passkey") ?? accounts[0])?.id ?? "";
}

export function SiteFeedDialog({
  site,
  accounts,
  onOpenChange,
}: {
  site: Site;
  accounts: SiteAccount[];
  onOpenChange: (o: boolean) => void;
}) {
  const siteAccounts = accounts.filter((a) => a.siteId === site.id && a.enabled);
  const [url, setUrl] = useState("");
  const [purpose, setPurpose] = useState<FeedPurpose>("generic");
  const [note, setNote] = useState("");
  const [accountId, setAccountId] = useState(() => defaultAccount(siteAccounts));
  const [error, setError] = useState<string | null>(null);
  const [created, setCreated] = useState<FeedSource | null>(null);
  const [fetchError, setFetchError] = useState<string | null>(null);
  const [startedAt, setStartedAt] = useState(0);
  const [timedOut, setTimedOut] = useState(false);
  const create = useCreateFeed();
  const fetchNow = useFetchFeedNow();

  const polled = useFeed(created?.id ?? null, !!created && !timedOut);
  const feed = polled.data ?? created;
  const done = !!feed?.lastFetchAt;

  useEffect(() => {
    if (!created || done || timedOut) return;
    const t = setTimeout(() => setTimedOut(true), Math.max(0, startedAt + WAIT_MS - Date.now()));
    return () => clearTimeout(t);
  }, [created, done, timedOut, startedAt]);

  const trimmed = url.trim();
  let valid = false;
  try {
    valid = /^https?:$/.test(new URL(trimmed).protocol);
  } catch {
    valid = false;
  }
  const shown = valid ? redactUrl(trimmed) : null;
  const siteHosts = [feedHostKey(site.baseUrl)];
  const mismatch = valid && !siteHosts.includes(feedHostKey(trimmed));
  const account = siteAccounts.find((a) => a.id === accountId);

  const submit = () => {
    if (!valid) {
      setError("填写完整的 RSS 地址（http / https）");
      return;
    }
    setError(null);
    create.mutate(
      {
        siteId: site.id,
        url: trimmed,
        purpose,
        ...(note.trim() ? { name: note.trim() } : {}),
        ...(siteAccounts.length > 1 && accountId ? { siteAccountId: accountId } : {}),
      },
      {
        onSuccess: (f) => {
          setCreated(f);
          setStartedAt(Date.now());
          fetchNow.mutate(f.id, { onError: (e) => setFetchError(errorMessage(e)) });
        },
        onError: (e) => setError(errorMessage(e)),
      },
    );
  };

  return (
    <Dialog open onOpenChange={onOpenChange}>
      <DialogContent className="max-h-[90vh] overflow-y-auto sm:max-w-lg">
        <DialogHeader>
          <DialogTitle>新建 RSS · {site.name}</DialogTitle>
          <DialogDescription>地址加密保存，页面上只显示去掉 passkey 的地址。</DialogDescription>
        </DialogHeader>

        {created && feed ? (
          <FirstFetch
            feed={feed}
            done={done}
            timedOut={timedOut}
            fetchError={fetchError}
            warnings={created.warnings ?? []}
          />
        ) : (
          <form
            id="site-feed-form"
            className="grid gap-1"
            onSubmit={(e) => {
              e.preventDefault();
              submit();
            }}
          >
            <FormField
              label="RSS 地址"
              htmlFor="site-feed-url"
              required
              error={error}
              hint={
                shown && shown !== trimmed ? (
                  <span className="break-all">
                    保存后显示为 <span className="font-mono">{shown}</span>
                  </span>
                ) : site.kind === "pt" ? (
                  "站点「控制面板 → RSS」里生成的链接"
                ) : (
                  "RSS 或 Atom 地址"
                )
              }
            >
              <Input
                id="site-feed-url"
                type="url"
                autoComplete="off"
                spellCheck={false}
                value={url}
                aria-invalid={!!error}
                placeholder={
                  site.kind === "pt" ? `${site.baseUrl.replace(/\/$/, "")}/torrentrss.php?passkey=…` : "https://"
                }
                onChange={(e) => setUrl(e.target.value)}
              />
            </FormField>
            {mismatch && site.kind !== "rss_feed" ? (
              <p className="-mt-1 mb-2 text-caption text-warning">
                地址域名与 {site.name}（{new URL(site.baseUrl).hostname}）不一致，仍可保存；确认没有填错站点。
              </p>
            ) : null}

            <div className="mb-3" role="radiogroup" aria-label="用途">
              <p className="mb-1.5 text-caption font-medium text-foreground">用途</p>
              <div className="inline-flex flex-wrap gap-1 rounded-xl border border-border p-1">
                {PURPOSES.map((p) => (
                  // biome-ignore lint/a11y/useSemanticElements: 分段按钮,radio 语义由 role 表达
                  <button
                    key={p.value}
                    type="button"
                    role="radio"
                    aria-checked={purpose === p.value}
                    onClick={() => setPurpose(p.value)}
                    className={cn(
                      "rounded-lg px-3 py-1.5 text-caption transition-colors",
                      purpose === p.value
                        ? "bg-foreground text-background"
                        : "text-muted-foreground hover:bg-accent hover:text-foreground",
                    )}
                  >
                    {p.label}
                  </button>
                ))}
              </div>
              <p className="mt-1.5 text-caption text-muted-foreground">
                {PURPOSES.find((p) => p.value === purpose)?.hint}
              </p>
            </div>

            {siteAccounts.length > 1 ? (
              <FormField label="账号" htmlFor="site-feed-account" hint="RSS 属于哪个账号（凭证失效时标记该账号）">
                <Select value={accountId} onValueChange={setAccountId}>
                  <SelectTrigger id="site-feed-account" className="w-full">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent position="popper">
                    {siteAccounts.map((a) => (
                      <SelectItem key={a.id} value={a.id}>
                        {a.label}
                        {a.hasPasskey ? "（有 passkey）" : ""}
                      </SelectItem>
                    ))}
                  </SelectContent>
                </Select>
              </FormField>
            ) : null}

            <FormField label="备注" htmlFor="site-feed-note" hint="可选；留空显示为「站点名 RSS」">
              <Input
                id="site-feed-note"
                value={note}
                maxLength={80}
                placeholder={`${site.name} RSS`}
                onChange={(e) => setNote(e.target.value)}
              />
            </FormField>

            <p className="text-caption text-muted-foreground">
              {account ? `账号 ${account.label}` : "这个站点没有账号，按地址里的 passkey 抓取"} · 解析器按站点定义 · 每
              30 分钟抓一次，可在 RSS 详情里改
            </p>
          </form>
        )}

        <DialogFooter className="mt-2 gap-2">
          {created ? (
            <Button type="button" onClick={() => onOpenChange(false)}>
              完成
            </Button>
          ) : (
            <>
              <Button type="button" variant="outline" onClick={() => onOpenChange(false)}>
                取消
              </Button>
              <Button type="submit" form="site-feed-form" disabled={create.isPending}>
                {create.isPending ? "保存中…" : "保存并抓取"}
              </Button>
            </>
          )}
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

function FirstFetch({
  feed,
  done,
  timedOut,
  fetchError,
  warnings,
}: {
  feed: FeedSource;
  done: boolean;
  timedOut: boolean;
  fetchError: string | null;
  warnings: string[];
}) {
  const err = feed.lastError
    ? String((feed.lastError as { message?: unknown }).message ?? JSON.stringify(feed.lastError))
    : fetchError;
  const count = feedWindowCount(feed);
  return (
    <div className="grid gap-3 text-caption">
      <p className="font-mono break-all text-muted-foreground">{feed.urlDisplay}</p>
      {warnings.map((w) => (
        <p key={w} className="rounded-lg border border-warning/40 bg-warning/10 px-3 py-2 text-warning">
          {w}
        </p>
      ))}
      {err ? (
        <p className="flex items-start gap-2 rounded-lg border border-destructive/40 bg-destructive/10 px-3 py-2 break-words text-destructive">
          <CircleAlert className="mt-0.5 size-4 shrink-0" />
          <span>首次抓取失败：{err}</span>
        </p>
      ) : done ? (
        <p className="flex items-center gap-2 rounded-lg border border-success/40 bg-success/10 px-3 py-2 text-success">
          <CheckCircle2 className="size-4 shrink-0" />
          <span>已保存，首次抓取到 {count ?? 0} 条</span>
        </p>
      ) : timedOut ? (
        <p className="rounded-lg border border-border px-3 py-2 text-muted-foreground">
          已保存。抓取还在排队（站点限流），结果稍后显示在 RSS 列表里。
        </p>
      ) : (
        <p className="flex items-center gap-2 rounded-lg border border-border px-3 py-2 text-muted-foreground">
          <Loader2 className="size-4 shrink-0 animate-spin" />
          <span>已保存，正在抓取…</span>
        </p>
      )}
    </div>
  );
}