import type { AssetVersion, DownloadSaveTarget, ManualAcquisitionResult } from "@umt/contracts";
import { ArrowDown, ArrowUp, Bot, ChevronDown, Download, Search, X } from "lucide-react";
import { useEffect, useId, useState } from "react";
import { Link } from "react-router";
import { toast } from "sonner";
import { useDownloadSavePaths } from "~/api/downloads.ts";
import { useEntityDetail } from "~/api/library.ts";
import { useLibraryVersions } from "~/api/library-versions.ts";
import { useTmdbMedia } from "~/api/search.ts";
import { useSite } from "~/api/sites.ts";
import { FilterSelect } from "~/components/console/filter-bar.tsx";
import { FormField } from "~/components/console/form-field.tsx";
import { StatusBadge } from "~/components/console/status-badge.tsx";
import { MEDIA_KIND } from "~/components/library/labels.ts";
import { CoverPlaceholder, posterPathOf } from "~/components/library/parts.tsx";
import { type AssignedWork, WorkAssignDialog } from "~/components/library/work-assign-dialog.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 { absTime, relTime } from "~/components/workbench/release-fields.ts";
import { errorMessage } from "~/lib/api.ts";
import { cn, formatBytes } from "~/lib/utils.ts";
import {
  buildManualOptions,
  CUSTOM_DIR,
  existingVersions,
  type IdentityChoice,
  identityChanged,
  type ManualDownloadOptions,
  resolveSavePath,
  savePathText,
  type TmdbType,
  targetOf,
  tmdbTypeOf,
  versionSummaryText,
} from "./manual-download-model.ts";

export type { ManualDownloadOptions } from "./manual-download-model.ts";

/** 调用方传入的资源摘要;缺的字段不显示 */
export interface ManualDownloadResource {
  title: string;
  subtitle?: string | null;
  sizeBytes: number | null;
  /** 已识别到的作品 */
  entityId?: string | undefined;
  entity?: { title: string; year: number | null; kind: string } | null;
  siteId?: string;
  /** 没给时按 siteId 查站点名 */
  siteName?: string | null;
  seeders?: number | null;
  leechers?: number | null;
  promotion?: { label: string; free: boolean } | null;
  hr?: "yes" | "no" | "unknown";
  publishedAt?: string | null;
  /** 未识别时身份区的类型缺省值(按标题解析出的季集猜) */
  kindHint?: TmdbType;
}

const AUTO = "__auto__";

/** 搜索、工作台和原站视图共用的一次性下载选项。 */
export function ManualDownloadDialog({
  resource,
  open,
  onOpenChange,
  submit,
  initialUnrecognized = false,
  onDelegate,
}: {
  resource: ManualDownloadResource;
  open: boolean;
  onOpenChange: (open: boolean) => void;
  submit: (options: ManualDownloadOptions) => Promise<ManualAcquisitionResult>;
  initialUnrecognized?: boolean;
  onDelegate?: () => void;
}) {
  const formId = useId();
  const entityId = resource.entityId;
  const paths = useDownloadSavePaths(resource.siteId, open);
  const detail = useEntityDetail(open ? entityId : undefined);
  const inventory = useLibraryVersions(open ? entityId : undefined);
  const site = useSite(open && !resource.siteName ? resource.siteId : undefined);
  const [instanceId, setInstanceId] = useState("");
  const [dir, setDir] = useState("");
  const [custom, setCustom] = useState("");
  const [mode, setMode] = useState<"normal" | "replace">("normal");
  const [selected, setSelected] = useState<string[]>([]);
  const [unrecognized, setUnrecognized] = useState(initialUnrecognized);
  const [identityOpen, setIdentityOpen] = useState(!entityId);
  // null = 没动过,显示作品当前的值
  const [tmdbType, setTmdbType] = useState<TmdbType | null>(null);
  const [tmdbId, setTmdbId] = useState<string | null>(null);
  const [picked, setPicked] = useState<{ id: string; title: string } | null>(null);
  const [busy, setBusy] = useState(false);
  const [result, setResult] = useState<ManualAcquisitionResult | null>(null);

  const entity = detail.data?.entity;
  const tmdbIdentity = detail.data?.identities.find(
    (i) => i.provider === "tmdb" && i.status === "accepted" && !i.contentUnitId,
  );
  const currentTmdb = tmdbIdentity
    ? { type: (tmdbIdentity.entityType === "movie" ? "movie" : "tv") as TmdbType, id: tmdbIdentity.externalId }
    : null;
  const shownType =
    tmdbType ?? currentTmdb?.type ?? (entityId ? tmdbTypeOf(resource.entity?.kind) : (resource.kindHint ?? "movie"));
  const shownId = tmdbId ?? currentTmdb?.id ?? "";
  const choice: IdentityChoice | null = picked
    ? { kind: "entity", id: picked.id, title: picked.title }
    : shownId
      ? { kind: "tmdb", type: shownType, id: shownId }
      : null;
  const changed = identityChanged(choice, { entityId, tmdb: currentTmdb });

  const target = targetOf(paths.data, instanceId);
  const existing = changed ? [] : existingVersions(inventory.data);
  const single = existing.length === 1 ? existing[0]!.assetId : null;
  const effectiveMode = changed ? "normal" : mode;

  useEffect(() => {
    if (mode === "replace" && single) setSelected([single]);
  }, [mode, single]);
  useEffect(() => {
    if (open) {
      setResult(null);
      setUnrecognized(initialUnrecognized);
      if (initialUnrecognized) setIdentityOpen(true);
    }
  }, [open, initialUnrecognized]);

  const go = async () => {
    setBusy(true);
    try {
      const r = await submit(
        buildManualOptions({
          entityId,
          currentTmdb,
          identity: choice,
          instanceId,
          target,
          dir,
          custom,
          allowUnrecognized: unrecognized,
          mode: effectiveMode,
          selected,
        }),
      );
      setResult(r);
      if (r.requiresConfirmation) {
        setUnrecognized(true);
        setIdentityOpen(true);
      }
      if (r.submitted) toast.success("已提交下载");
    } catch (e) {
      toast.error(errorMessage(e));
    } finally {
      setBusy(false);
    }
  };

  const work = resource.entity ?? (entity ? { title: entity.title, year: entity.year, kind: entity.kind } : null);
  const siteName = resource.siteName ?? site.data?.name ?? null;
  const missingCustom = dir === CUSTOM_DIR && !custom.trim();
  const badTmdb = !picked && !!shownId && !/^\d+$/.test(shownId);

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-h-[90dvh] overflow-y-auto sm:max-w-2xl">
        <DialogHeader>
          <div className="flex min-w-0 items-start gap-3">
            {work ? (
              <CoverPlaceholder
                title={work.title}
                kind={work.kind}
                posterPath={posterPathOf(entity?.metadata)}
                small
                className="h-20 w-14"
              />
            ) : (
              <span className="grid h-10 w-10 shrink-0 place-items-center rounded-full border border-border text-muted-foreground">
                <Download className="h-4 w-4" />
              </span>
            )}
            <div className="min-w-0 space-y-1">
              <DialogTitle className="break-words">
                {work ? `${work.title}${work.year ? ` (${work.year})` : ""}` : "下载这个资源"}
              </DialogTitle>
              <DialogDescription>
                {[siteName, work ? (MEDIA_KIND[work.kind as keyof typeof MEDIA_KIND] ?? null) : "未识别作品"]
                  .filter(Boolean)
                  .join(" · ")}
              </DialogDescription>
            </div>
          </div>
        </DialogHeader>
        <div className="min-w-0 space-y-4">
          <ResourceSummary resource={resource} />
          <SaveTargetFields
            formId={formId}
            instances={paths.data?.instances ?? []}
            autoInstanceId={paths.data?.autoInstanceId ?? null}
            loading={paths.isPending}
            error={paths.error ? errorMessage(paths.error) : null}
            instanceId={instanceId}
            onInstanceChange={(v) => {
              setInstanceId(v);
              if (dir !== CUSTOM_DIR) setDir("");
            }}
            target={target}
            dir={dir}
            onDirChange={setDir}
            custom={custom}
            onCustomChange={setCustom}
          />
          <IdentitySection
            formId={formId}
            open={identityOpen}
            onToggle={() => setIdentityOpen((v) => !v)}
            current={work && entityId ? { ...work, tmdbId: currentTmdb?.id ?? null } : null}
            unrecognized={!entityId || unrecognized}
            type={shownType}
            onTypeChange={(v) => {
              setTmdbType(v);
              setPicked(null);
            }}
            tmdbId={shownId}
            onTmdbIdChange={(v) => {
              setTmdbId(v.trim());
              setPicked(null);
            }}
            picked={picked}
            onPick={(w) => {
              if ("mediaEntityId" in w) setPicked({ id: w.mediaEntityId, title: w.title });
              else {
                setPicked(null);
                setTmdbType(w.tmdb.type);
                setTmdbId(w.tmdb.id);
              }
            }}
            onClearPick={() => setPicked(null)}
            changed={changed}
            subject={resource.title}
          />
          {entityId && !changed ? (
            <ExistingVersionsSection
              formId={formId}
              loading={inventory.isPending}
              error={!!inventory.error}
              summary={versionSummaryText(inventory.data?.summary)}
              versions={existing}
              mode={mode}
              onModeChange={setMode}
              selected={selected}
              onSelectedChange={setSelected}
            />
          ) : null}
          {result && !result.submitted && !result.requiresConfirmation ? (
            <p className="text-caption text-warning">{result.rejected.map((r) => r.message).join("；")}</p>
          ) : null}
          {result?.submitted ? (
            <Link className="text-caption underline" to={`/console/downloads?plan=${result.plan?.id ?? ""}`}>
              查看下载任务
            </Link>
          ) : null}
        </div>
        <DialogFooter>
          {onDelegate ? (
            <Button
              variant="outline"
              disabled={busy}
              onClick={() => {
                onOpenChange(false);
                onDelegate();
              }}
            >
              <Bot />
              委托智能体
            </Button>
          ) : null}
          <Button
            onClick={() => void go()}
            disabled={
              busy ||
              !!result?.submitted ||
              missingCustom ||
              badTmdb ||
              (effectiveMode === "replace" && (!selected.length || inventory.isPending || !!inventory.error))
            }
          >
            <Download />
            {busy ? "提交中…" : unrecognized && !changed ? "继续下载" : "开始下载"}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

/** 资源行:原始标题、促销、H&R、做种 / 下载、大小、发布时间 */
export function ResourceSummary({ resource: r }: { resource: ManualDownloadResource }) {
  return (
    <div className="min-w-0 space-y-1.5 rounded-xl border border-border p-3">
      <div className="flex min-w-0 flex-wrap items-start gap-x-2 gap-y-1">
        <p className="min-w-0 flex-1 text-sm font-medium break-all text-foreground">{r.title}</p>
        <span className="flex flex-wrap gap-1">
          {r.promotion ? (
            <StatusBadge tone={r.promotion.free ? "success" : "neutral"}>{r.promotion.label}</StatusBadge>
          ) : null}
          {r.hr === "yes" ? <StatusBadge tone="warning">H&R</StatusBadge> : null}
          {r.hr === "unknown" ? <StatusBadge>H&R 未知</StatusBadge> : null}
        </span>
      </div>
      {r.subtitle ? <p className="line-clamp-2 text-caption text-muted-foreground">{r.subtitle}</p> : null}
      <div className="flex flex-wrap items-center gap-x-3 gap-y-1 text-meta text-muted-foreground tabular-nums">
        <span>{r.sizeBytes === null ? "大小未知" : formatBytes(r.sizeBytes, 1)}</span>
        {r.seeders !== undefined || r.leechers !== undefined ? (
          <span className="inline-flex items-center gap-0.5" title="做种 / 下载">
            <ArrowUp className="h-3 w-3" aria-label="做种" />
            {r.seeders ?? "—"}
            <ArrowDown className="ml-1 h-3 w-3" aria-label="下载" />
            {r.leechers ?? "—"}
          </span>
        ) : null}
        {r.publishedAt ? <span title={absTime(r.publishedAt)}>发布 {relTime(r.publishedAt)}</span> : null}
      </div>
    </div>
  );
}

/** 下载器 + 保存目录并排;下方写明实际会保存到哪 */
export function SaveTargetFields({
  formId,
  instances,
  autoInstanceId,
  loading = false,
  error = null,
  instanceId,
  onInstanceChange,
  target,
  dir,
  onDirChange,
  custom,
  onCustomChange,
}: {
  formId: string;
  instances: DownloadSaveTarget[];
  autoInstanceId: string | null;
  loading?: boolean;
  error?: string | null;
  instanceId: string;
  onInstanceChange: (v: string) => void;
  target: DownloadSaveTarget | null;
  dir: string;
  onDirChange: (v: string) => void;
  custom: string;
  onCustomChange: (v: string) => void;
}) {
  const auto = instances.find((t) => t.instanceId === autoInstanceId);
  const resolved = resolveSavePath(target, dir, custom);
  const pathHint = error
    ? error
    : loading
      ? "加载中…"
      : !target && dir !== CUSTOM_DIR
        ? "没有可用的下载器，先在设置里添加下载器和保存目录"
        : resolved
          ? `将保存到：${savePathText(resolved)}`
          : "填写下载器能访问的路径";
  return (
    <div className="grid items-start gap-x-3 sm:grid-cols-2">
      <FormField label="下载器" htmlFor={`${formId}-dl`} hint={!instanceId && auto ? `自动：${auto.name}` : undefined}>
        <Select value={instanceId || AUTO} onValueChange={(v) => onInstanceChange(v === AUTO ? "" : v)}>
          <SelectTrigger id={`${formId}-dl`} className="w-full">
            <SelectValue />
          </SelectTrigger>
          <SelectContent position="popper">
            <SelectItem value={AUTO}>自动</SelectItem>
            {instances.map((t) => (
              <SelectItem key={t.instanceId} value={t.instanceId}>
                {t.name}
                {t.isDefault ? "（默认）" : ""}
              </SelectItem>
            ))}
          </SelectContent>
        </Select>
      </FormField>
      <FormField label="保存目录" htmlFor={`${formId}-dir`} hint={pathHint} error={error}>
        <Select value={dir || AUTO} onValueChange={(v) => onDirChange(v === AUTO ? "" : v)}>
          <SelectTrigger id={`${formId}-dir`} className="w-full">
            <SelectValue />
          </SelectTrigger>
          <SelectContent position="popper">
            <SelectItem value={AUTO}>自动</SelectItem>
            {(target?.dirs ?? []).map((d) => (
              <SelectItem key={d.path} value={d.path}>
                {d.path}
                {d.isDefault ? "（默认）" : ""}
              </SelectItem>
            ))}
            <SelectItem value={CUSTOM_DIR}>自定义路径…</SelectItem>
          </SelectContent>
        </Select>
      </FormField>
      {dir === CUSTOM_DIR ? (
        <FormField
          label="自定义路径"
          htmlFor={`${formId}-custom`}
          hint="下载器路径或本机路径都行，本机路径按路径映射换算"
          className="sm:col-span-2"
        >
          <Input
            id={`${formId}-custom`}
            value={custom}
            onChange={(e) => onCustomChange(e.target.value)}
            placeholder="/downloads/movies"
          />
        </FormField>
      ) : null}
    </div>
  );
}

/** 作品身份:类型 + TMDB 编号(可搜索);已识别时折叠,未识别时默认展开 */
export function IdentitySection({
  formId,
  open,
  onToggle,
  current,
  unrecognized,
  type,
  onTypeChange,
  tmdbId,
  onTmdbIdChange,
  picked,
  onPick,
  onClearPick,
  changed,
  subject,
}: {
  formId: string;
  open: boolean;
  onToggle: () => void;
  current: { title: string; year: number | null; kind: string; tmdbId: string | null } | null;
  unrecognized: boolean;
  type: TmdbType;
  onTypeChange: (v: TmdbType) => void;
  tmdbId: string;
  onTmdbIdChange: (v: string) => void;
  picked: { id: string; title: string } | null;
  onPick: (w: AssignedWork) => void;
  onClearPick: () => void;
  changed: boolean;
  subject: string;
}) {
  const [searching, setSearching] = useState(false);
  const valid = /^\d+$/.test(tmdbId);
  const preview = useTmdbMedia(open && !picked && valid && changed ? type : undefined, tmdbId);
  const summary = current
    ? [
        `${current.title}${current.year ? ` (${current.year})` : ""}`,
        MEDIA_KIND[current.kind as keyof typeof MEDIA_KIND],
        current.tmdbId ? `TMDB ${current.tmdbId}` : null,
      ]
        .filter(Boolean)
        .join(" · ")
    : "未识别";
  return (
    <section className="min-w-0 rounded-xl border border-border">
      <button
        type="button"
        onClick={onToggle}
        aria-expanded={open}
        aria-controls={`${formId}-identity`}
        className="flex w-full cursor-pointer items-center gap-2 rounded-xl px-3 py-2.5 text-left transition-colors duration-micro hover:bg-wash/[0.06]"
      >
        <span className="shrink-0 text-caption font-medium text-foreground">作品</span>
        <span
          className={cn(
            "min-w-0 flex-1 truncate text-caption",
            changed ? "text-foreground" : current ? "text-muted-foreground" : "text-warning",
          )}
        >
          {changed
            ? `改为：${picked ? picked.title : `${type === "movie" ? "电影" : "剧集"} · TMDB ${tmdbId}`}`
            : summary}
        </span>
        <span className="shrink-0 text-meta text-muted-foreground">{open ? "收起" : "修改"}</span>
        <ChevronDown
          className={cn(
            "h-4 w-4 shrink-0 text-muted-foreground transition-transform duration-base",
            open && "rotate-180",
          )}
        />
      </button>
      {open ? (
        <div id={`${formId}-identity`} className="space-y-3 border-t border-border px-3 pt-3 pb-1">
          {unrecognized && !changed ? (
            <p className="text-caption text-warning">
              暂未识别到作品。指定后绑定到这个资源；不指定也能下载，整理时再补全识别和元数据。
            </p>
          ) : null}
          {picked ? (
            <div className="flex min-w-0 items-center gap-2 pb-3 text-sm">
              <span className="min-w-0 flex-1 truncate text-foreground">
                {picked.title}
                <span className="text-muted-foreground"> · 在媒体库</span>
              </span>
              <Button type="button" variant="ghost" size="icon-sm" aria-label="清除选择" onClick={onClearPick}>
                <X />
              </Button>
            </div>
          ) : (
            <div className="grid items-start gap-x-3 sm:grid-cols-[10rem_1fr]">
              <FormField label="类型" htmlFor={`${formId}-kind`}>
                <Select value={type} onValueChange={(v) => onTypeChange(v as TmdbType)}>
                  <SelectTrigger id={`${formId}-kind`} className="w-full">
                    <SelectValue />
                  </SelectTrigger>
                  <SelectContent position="popper">
                    <SelectItem value="movie">电影</SelectItem>
                    <SelectItem value="tv">剧集</SelectItem>
                  </SelectContent>
                </Select>
              </FormField>
              <FormField
                label="TMDB 编号"
                htmlFor={`${formId}-tmdb`}
                error={tmdbId && !valid ? "TMDB 编号是数字" : preview.error ? errorMessage(preview.error) : null}
                hint={
                  preview.data
                    ? `${preview.data.title}${preview.data.year ? ` (${preview.data.year})` : ""}${preview.data.localEntityId ? " · 在媒体库" : ""}`
                    : preview.isFetching
                      ? "查询中…"
                      : changed
                        ? undefined
                        : "输入编号，或搜索作品名"
                }
              >
                <div className="flex gap-2">
                  <Input
                    id={`${formId}-tmdb`}
                    inputMode="numeric"
                    value={tmdbId}
                    onChange={(e) => onTmdbIdChange(e.target.value)}
                    placeholder="例如 969681"
                    aria-invalid={!!tmdbId && !valid}
                  />
                  <Button
                    type="button"
                    variant="outline"
                    size="icon"
                    aria-label="搜索作品"
                    title="搜索作品"
                    onClick={() => setSearching(true)}
                  >
                    <Search />
                  </Button>
                </div>
              </FormField>
            </div>
          )}
        </div>
      ) : null}
      <WorkAssignDialog
        open={searching}
        onOpenChange={setSearching}
        initialQuery={current?.title ?? ""}
        subject={subject}
        onAssign={async (w) => onPick(w)}
      />
    </section>
  );
}

/** 已有版本:先一行摘要;选一次性洗版时展开勾选要替换的文件 */
export function ExistingVersionsSection({
  formId,
  loading,
  error,
  summary,
  versions,
  mode,
  onModeChange,
  selected,
  onSelectedChange,
}: {
  formId: string;
  loading: boolean;
  error: boolean;
  summary: string | null;
  versions: AssetVersion[];
  mode: "normal" | "replace";
  onModeChange: (m: "normal" | "replace") => void;
  selected: string[];
  onSelectedChange: (ids: string[]) => void;
}) {
  if (loading) return <p className="text-caption text-muted-foreground">正在读取已有版本…</p>;
  if (error) return <p className="text-caption text-destructive">已有版本读取失败，重试后再选洗版</p>;
  if (!versions.length) return null;
  return (
    <div className="min-w-0 space-y-2">
      <div className="flex min-w-0 flex-wrap items-center justify-between gap-2">
        <p className="min-w-0 text-caption text-foreground">{summary ?? `媒体库已有 ${versions.length} 个版本`}</p>
        <FilterSelect
          label="入库方式"
          value={mode === "normal" ? "" : mode}
          onChange={(v) => onModeChange(v === "replace" ? "replace" : "normal")}
          allLabel="正常入库，保留已有版本"
          options={[{ value: "replace", label: "一次性洗版" }]}
        />
      </div>
      {mode === "replace" ? (
        <>
          <fieldset className="max-h-56 space-y-2 overflow-auto rounded-lg border border-border p-3">
            <legend className="px-1 text-caption">选择要替换的已有文件</legend>
            {versions.map((v) => (
              <div key={v.assetId} className="flex items-start gap-2 text-caption">
                <input
                  type="checkbox"
                  id={`${formId}-${v.assetId}`}
                  checked={selected.includes(v.assetId)}
                  onChange={(e) =>
                    onSelectedChange(
                      e.target.checked ? [...selected, v.assetId] : selected.filter((id) => id !== v.assetId),
                    )
                  }
                />
                <label htmlFor={`${formId}-${v.assetId}`} className="min-w-0 break-all">
                  <VersionDescription version={v} />
                </label>
              </div>
            ))}
          </fieldset>
          <p className="text-meta text-muted-foreground">
            本次新文件成功入库后替换所选旧文件。剧集只替换成功对应的季集，其余保留。
          </p>
        </>
      ) : null}
    </div>
  );
}

function VersionDescription({ version }: { version: AssetVersion }) {
  return (
    <span className="min-w-0 break-all">
      {version.fileName}
      <span className="block text-meta text-muted-foreground">
        {[
          version.resolution,
          version.source,
          version.videoCodec,
          ...version.hdr,
          version.edition,
          version.sizeBytes ? formatBytes(version.sizeBytes, 1) : null,
        ]
          .filter(Boolean)
          .join(" · ")}
      </span>
    </span>
  );
}