import { type ContentUnit, FinalFieldValue, type UnitMetadataField } from "@umt/contracts";
import { LoaderCircle, Lock, LockOpen } from "lucide-react";
import { type FormEvent, useId, useState } from "react";
import { toast } from "sonner";
import { useLockUnitField, useUnlockUnitField } from "~/api/library.ts";
import { StatusBadge } from "~/components/console/status-badge.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 { Label } from "~/components/ui/label.tsx";
import { Textarea } from "~/components/ui/textarea.tsx";
import { errorMessage } from "~/lib/api.ts";
import { METADATA_SOURCE, UNIT_FIELD_LABEL } from "./labels.ts";

// 季 / 集字段覆盖与锁定(MD-1):改标题 / 简介 / 播出日期即锁定,元数据刷新不再改写;解锁回到来源值。

const EDITABLE: UnitMetadataField[] = ["name", "airDate", "overview"];

const pad = (n: number | null) => String(n ?? 0).padStart(2, "0");

export function finalOf(u: ContentUnit, field: string): FinalFieldValue | null {
  const p = FinalFieldValue.safeParse((u.metadata as Record<string, unknown>)[field]);
  return p.success ? p.data : null;
}

export function UnitFieldDialog({
  entityId,
  unit,
  onOpenChange,
}: {
  entityId: string;
  /** null 表示关闭 */
  unit: ContentUnit | null;
  onOpenChange: (o: boolean) => void;
}) {
  const id = useId();
  const lock = useLockUnitField(entityId);
  const unlock = useUnlockUnitField(entityId);
  const [values, setValues] = useState<Record<string, string>>({});
  const [error, setError] = useState<string | null>(null);
  const [lastId, setLastId] = useState<string | null>(null);
  if ((unit?.id ?? null) !== lastId) {
    setLastId(unit?.id ?? null);
    setError(null);
    setValues(
      Object.fromEntries(
        EDITABLE.map((f) => {
          const v = unit ? finalOf(unit, f)?.value : null;
          return [f, typeof v === "string" ? v : ""];
        }),
      ),
    );
  }
  if (!unit) return <Dialog open={false} />;
  const busy = lock.isPending || unlock.isPending;
  const code = `S${pad(unit.seasonNumber)}E${pad(unit.episodeNumber)}`;

  const submit = async (e: FormEvent) => {
    e.preventDefault();
    const changed = EDITABLE.filter((f) => {
      const cur = finalOf(unit, f)?.value;
      return (values[f] ?? "").trim() !== (typeof cur === "string" ? cur : "");
    });
    if (!changed.length) {
      onOpenChange(false);
      return;
    }
    const date = values.airDate?.trim();
    if (changed.includes("airDate") && date && !/^\d{4}-\d{2}-\d{2}$/.test(date)) {
      setError("播出日期格式是 YYYY-MM-DD");
      return;
    }
    if (changed.includes("name") && !values.name?.trim()) {
      setError("标题不能为空");
      return;
    }
    try {
      for (const f of changed) {
        const v = (values[f] ?? "").trim();
        await lock.mutateAsync({ unitId: unit.id, field: f, value: v || null });
      }
      toast.success(`已锁定 ${code} 的 ${changed.map((f) => UNIT_FIELD_LABEL[f]).join("、")}`);
      onOpenChange(false);
    } catch (err) {
      toast.error(errorMessage(err, "保存失败"));
    }
  };

  const locked = EDITABLE.filter((f) => unit.fieldLocks.includes(f));
  return (
    <Dialog open onOpenChange={(o) => !busy && onOpenChange(o)}>
      <DialogContent>
        <DialogHeader>
          <DialogTitle>修改 {code}</DialogTitle>
          <DialogDescription>改过的字段会锁定，刷新元数据不再改写。编号和文件位置不变。</DialogDescription>
        </DialogHeader>
        <form onSubmit={submit} className="grid gap-3">
          {EDITABLE.map((f) => {
            const fin = finalOf(unit, f);
            const isLocked = unit.fieldLocks.includes(f);
            return (
              <div key={f} className="grid gap-1.5">
                <div className="flex items-center justify-between gap-2">
                  <Label htmlFor={`${id}-${f}`}>{UNIT_FIELD_LABEL[f]}</Label>
                  <div className="flex items-center gap-1.5">
                    {fin ? (
                      <span className="text-meta text-muted-foreground">
                        来源 {METADATA_SOURCE[fin.source] ?? fin.source}
                        {fin.language ? ` · ${fin.language}` : ""}
                      </span>
                    ) : null}
                    {isLocked ? (
                      <StatusBadge>
                        <Lock className="h-3 w-3" />
                        已锁定
                      </StatusBadge>
                    ) : null}
                  </div>
                </div>
                {f === "overview" ? (
                  <Textarea
                    id={`${id}-${f}`}
                    rows={4}
                    value={values[f] ?? ""}
                    onChange={(e) => setValues((v) => ({ ...v, [f]: e.target.value }))}
                  />
                ) : (
                  <Input
                    id={`${id}-${f}`}
                    value={values[f] ?? ""}
                    placeholder={f === "airDate" ? "YYYY-MM-DD" : undefined}
                    onChange={(e) => setValues((v) => ({ ...v, [f]: e.target.value }))}
                  />
                )}
              </div>
            );
          })}
          {error ? <p className="text-meta text-destructive">{error}</p> : null}
          <DialogFooter className="flex-wrap gap-2">
            {locked.length ? (
              <Button
                type="button"
                variant="ghost"
                disabled={busy}
                className="sm:mr-auto"
                onClick={async () => {
                  try {
                    for (const f of locked) await unlock.mutateAsync({ unitId: unit.id, field: f });
                    toast.success(`已解锁 ${code}`);
                    onOpenChange(false);
                  } catch (err) {
                    toast.error(errorMessage(err, "解锁失败"));
                  }
                }}
              >
                <LockOpen />
                全部解锁
              </Button>
            ) : null}
            <Button type="button" variant="outline" onClick={() => onOpenChange(false)} disabled={busy}>
              取消
            </Button>
            <Button type="submit" disabled={busy}>
              {lock.isPending ? <LoaderCircle className="animate-spin" /> : null}
              保存并锁定
            </Button>
          </DialogFooter>
        </form>
      </DialogContent>
    </Dialog>
  );
}