import type { Subscription, SubscriptionCoverage, SubscriptionOverviewItem } from "@umt/contracts";
import { Check, Wand2 } from "lucide-react";
import { useEffect, useId, useMemo, useState } from "react";
import { toast } from "sonner";
import { useFillSlot, useSetSlotOrder, useUpdateSubscription } from "~/api/subscriptions.ts";
import { Panel } from "~/components/library/parts.tsx";
import { Button } from "~/components/ui/button.tsx";
import { errorMessage } from "~/lib/api.ts";
import {
  AUTOFILL_SOURCE,
  type DraftErrors,
  draftFromSubscription,
  draftToParams,
  type SubscriptionDraft,
} from "./model.ts";
import { SlotOrderList } from "./slot-order.tsx";
import { AutoFillFields } from "./subscription-form.tsx";

// 对比视图的"收录版本"区(设计 §2.2):拖动排序(PUT slot-order)、行尾计数、补全此版本、自动补全开关与预算。

type SlotRow = SubscriptionCoverage["rows"][number] & { id: string };

export function SlotPanel({
  sub,
  cov,
  item,
  canFill,
}: {
  sub: Subscription;
  cov: SubscriptionCoverage | undefined;
  item: SubscriptionOverviewItem | null | undefined;
  canFill: boolean;
}) {
  const id = useId();
  const setOrder = useSetSlotOrder();
  const fill = useFillSlot();
  const update = useUpdateSubscription();
  const serverRows = useMemo<SlotRow[]>(
    () => (cov?.rows ?? []).filter((r) => r.slotId !== null).map((r) => ({ ...r, id: r.slotId! })),
    [cov],
  );
  const [rows, setRows] = useState<SlotRow[]>(serverRows);
  useEffect(() => setRows(serverRows), [serverRows]);
  const dirty = rows.map((r) => r.id).join() !== serverRows.map((r) => r.id).join();

  const base = useMemo(() => draftFromSubscription(sub, "off"), [sub]);
  const [af, setAf] = useState<Pick<SubscriptionDraft, "autoFill" | "unitsPerDay" | "gbPerDay">>(base);
  useEffect(() => setAf(base), [base]);
  const [errs, setErrs] = useState<DraftErrors>({});
  const afDirty = af.autoFill !== base.autoFill || af.unitsPerDay !== base.unitsPerDay || af.gbPerDay !== base.gbPerDay;

  const saveOrder = () =>
    setOrder.mutate(
      { id: sub.id, slotIds: rows.map((r) => r.id) },
      {
        onSuccess: () => toast.success(`主版本：${rows[0]?.name ?? ""}`),
        onError: (e) => {
          toast.error(errorMessage(e));
          setRows(serverRows);
        },
      },
    );
  const fillSlot = (r: SlotRow) =>
    fill.mutate(
      { id: sub.id, slotId: r.id },
      {
        onSuccess: (x) => toast.success(x.deduplicated ? "补全任务已在排队" : `已开始补全「${r.name}」`),
        onError: (e) => toast.error(errorMessage(e, "补全失败")),
      },
    );
  const saveAutoFill = () => {
    const { params, errors } = draftToParams({ ...base, ...af }, sub.params, {
      upgradeChanged: false,
      totalChanged: false,
    });
    setErrs(errors);
    if (Object.keys(errors).length) return;
    update.mutate(
      { id: sub.id, params },
      { onSuccess: () => toast.success("自动补全设置已保存"), onError: (e) => toast.error(errorMessage(e)) },
    );
  };

  return (
    <Panel
      title="收录版本"
      description="拖动调整顺序，第一个是主版本。主版本缺的照常追更；其他版本按下面的自动补全设置补齐。"
      actions={
        dirty ? (
          <>
            <Button variant="ghost" size="sm" onClick={() => setRows(serverRows)} disabled={setOrder.isPending}>
              还原
            </Button>
            <Button size="sm" onClick={saveOrder} disabled={setOrder.isPending}>
              <Check />
              保存顺序
            </Button>
          </>
        ) : null
      }
    >
      {rows.length === 0 ? (
        <p className="text-caption text-muted-foreground">
          {sub.mediaEntityId ? "还没有收录版本。在下方规则区新建。" : "作品加入媒体库后才有收录版本。"}
        </p>
      ) : (
        <SlotOrderList
          items={rows}
          onChange={setRows}
          disabled={setOrder.isPending}
          renderExtra={(r, i) => (
            <span className="flex shrink-0 flex-wrap items-center gap-x-3 gap-y-1 text-meta text-muted-foreground tabular-nums max-sm:w-full max-sm:pl-9">
              <span>已整理 {r.summary.have}</span>
              <span className={r.summary.missing ? "text-destructive" : undefined}>缺 {r.summary.missing}</span>
              <span>下载中 {r.summary.inflight}</span>
              {i === 0 ? null : <span>{r.autoFill ? "自动补全" : "只登记缺失"}</span>}
              <Button
                variant="outline"
                size="xs"
                onClick={() => fillSlot(r)}
                disabled={!canFill || fill.isPending || r.summary.missing === 0}
                title={canFill ? undefined : "订阅不在追踪中，先恢复"}
              >
                <Wand2 />
                补全此版本
              </Button>
            </span>
          )}
        />
      )}
      <div className="mt-5 space-y-2 border-t border-border/60 pt-4">
        <div className="flex flex-wrap items-baseline justify-between gap-2">
          <h3 className="text-sm font-semibold text-foreground">自动补全其他版本</h3>
          {item ? (
            <span className="text-meta text-muted-foreground">
              当前{item.autoFill.enabled ? "开启" : "关闭"} · 来自{AUTOFILL_SOURCE[item.autoFill.source]}
            </span>
          ) : null}
        </div>
        <AutoFillFields d={af} patch={(p) => setAf((x) => ({ ...x, ...p }))} errors={errs} idPrefix={id} />
        {afDirty ? (
          <div className="flex justify-end gap-2">
            <Button variant="ghost" size="sm" onClick={() => setAf(base)} disabled={update.isPending}>
              还原
            </Button>
            <Button size="sm" onClick={saveAutoFill} disabled={update.isPending}>
              <Check />
              保存
            </Button>
          </div>
        ) : null}
      </div>
    </Panel>
  );
}