import type { AssetVersion, ManualAcquisitionRequest, ManualAcquisitionResult } from "@umt/contracts";
import { Bot, Download } from "lucide-react";
import { useEffect, useId, useState } from "react";
import { Link } from "react-router";
import { toast } from "sonner";
import { downloaders } from "~/api/instances.ts";
import { useLibraryVersions } from "~/api/library-versions.ts";
import { FilterSelect } from "~/components/console/filter-bar.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 { errorMessage } from "~/lib/api.ts";
import { formatBytes } from "~/lib/utils.ts";

export type ManualDownloadOptions = Omit<ManualAcquisitionRequest, "sourceReleaseId">;
export interface ManualDownloadResource {
  title: string;
  sizeBytes: number | null;
  entityId?: string;
}

/** 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 instances = downloaders.useList();
  const formId = useId();
  const inventory = useLibraryVersions(open ? resource.entityId : undefined);
  const [instanceId, setInstanceId] = useState("");
  const [savePath, setSavePath] = useState("");
  const [mode, setMode] = useState<"normal" | "replace">("normal");
  const [selected, setSelected] = useState<string[]>([]);
  const [unrecognized, setUnrecognized] = useState(initialUnrecognized);
  const [busy, setBusy] = useState(false);
  const [result, setResult] = useState<ManualAcquisitionResult | null>(null);
  const versions = new Map<string, AssetVersion>();
  for (const v of inventory.data?.movie?.versions ?? []) versions.set(v.assetId, v);
  for (const season of inventory.data?.seasons ?? [])
    for (const episode of season.episodes) for (const v of episode.versions) versions.set(v.assetId, v);
  for (const v of inventory.data?.unplaced ?? []) versions.set(v.assetId, v);
  const existing = [...versions.values()];
  const single = existing.length === 1 ? existing[0]!.assetId : null;
  useEffect(() => {
    if (mode === "replace" && single) setSelected([single]);
  }, [mode, single]);
  useEffect(() => {
    if (open) {
      setResult(null);
      setUnrecognized(initialUnrecognized);
    }
  }, [open, initialUnrecognized]);
  const go = async () => {
    setBusy(true);
    try {
      const r = await submit({
        ...(resource.entityId ? { entityId: resource.entityId } : {}),
        ...(instanceId ? { downloaderInstanceId: instanceId } : {}),
        ...(savePath.trim() ? { savePath: savePath.trim() } : {}),
        ...(unrecognized ? { allowUnrecognized: true } : {}),
        importMode: mode,
        replacementAssetIds: mode === "replace" ? selected : [],
      });
      setResult(r);
      if (r.requiresConfirmation) setUnrecognized(true);
      if (r.submitted) toast.success("已提交下载");
    } catch (e) {
      toast.error(errorMessage(e));
    } finally {
      setBusy(false);
    }
  };
  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="sm:max-w-xl">
        <DialogHeader>
          <DialogTitle>下载这个资源</DialogTitle>
          <DialogDescription className="break-all">
            {resource.title}
            {resource.sizeBytes !== null ? ` · ${formatBytes(resource.sizeBytes, 1)}` : ""}
          </DialogDescription>
        </DialogHeader>
        <div className="space-y-4">
          <FilterSelect
            label="下载器"
            value={instanceId}
            onChange={setInstanceId}
            allLabel="默认下载器"
            options={(instances.data?.items ?? [])
              .filter((v) => v.enabled)
              .map((v) => ({ value: v.id, label: v.name }))}
          />
          <label htmlFor={`${formId}-path`} className="block space-y-1 text-caption">
            保存目录
            <Input
              id={`${formId}-path`}
              value={savePath}
              onChange={(e) => setSavePath(e.target.value)}
              placeholder="留空使用默认下载目录"
            />
          </label>
          <FilterSelect
            label="入库方式"
            value={mode === "normal" ? "" : mode}
            onChange={(v) => setMode(v === "replace" ? "replace" : "normal")}
            allLabel="正常入库，保留已有版本"
            options={[{ value: "replace", label: "一次性洗版入库" }]}
          />
          {resource.entityId && inventory.isPending ? (
            <p className="text-caption text-muted-foreground">正在读取已有版本…</p>
          ) : null}
          {inventory.error ? (
            <p className="text-caption text-destructive">已有版本读取失败，请重试后选择洗版。</p>
          ) : null}
          {existing.length ? (
            <fieldset className="max-h-56 space-y-2 overflow-auto rounded-lg border p-3">
              <legend className="px-1 text-caption">
                {mode === "replace" ? "选择要替换的已有文件" : "媒体库已有版本"}
              </legend>
              {existing.map((v) => (
                <div key={v.assetId} className="flex items-start gap-2 text-caption">
                  {mode === "replace" ? (
                    <input
                      type="checkbox"
                      id={`${formId}-${v.assetId}`}
                      checked={selected.includes(v.assetId)}
                      onChange={(e) =>
                        setSelected((ids) =>
                          e.target.checked ? [...ids, v.assetId] : ids.filter((id) => id !== v.assetId),
                        )
                      }
                    />
                  ) : null}
                  {mode === "replace" ? (
                    <label htmlFor={`${formId}-${v.assetId}`} className="min-w-0 break-all">
                      <VersionDescription version={v} />
                    </label>
                  ) : (
                    <VersionDescription version={v} />
                  )}
                </div>
              ))}
            </fieldset>
          ) : mode === "replace" ? (
            <p className="text-caption text-muted-foreground">没有可替换的已有文件，请选择正常入库。</p>
          ) : null}
          {mode === "replace" ? (
            <p className="text-meta text-muted-foreground">
              本次新文件成功入库后替换所选旧文件。剧集只替换成功对应的季集，其余保留。
            </p>
          ) : null}
          {unrecognized ? (
            <p className="rounded-lg border border-warning/40 p-3 text-caption text-warning">
              暂未识别到作品。可以继续下载；整理时会尝试补全识别和本地元数据。
            </p>
          ) : null}
          {result && !result.submitted && !result.requiresConfirmation ? (
            <p className="text-caption text-warning">{result.rejected.map((r) => r.message).join("；")}</p>
          ) : null}
          {result?.submitted ? (
            <Link className="text-caption underline" to={`/console/downloads?plan=${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 ||
              (mode === "replace" && (!selected.length || inventory.isPending || !!inventory.error))
            }
          >
            <Download />
            {busy ? "提交中…" : unrecognized ? "继续下载" : "提交下载"}
          </Button>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}

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]
          .filter(Boolean)
          .join(" · ")}
      </span>
    </span>
  );
}