"use client";

import { useState } from "react";
import type { RefObject } from "react";
import { ChoiceGroup, choiceOptions } from "@/components/form/choice-group";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { SheetFooter } from "@/components/ui/sheet";
import { FRAME_TYPE_LABELS } from "@/lib/hive/labels";
import { partDisplayName } from "@/lib/hive/names";
import { FRAME_TYPES, MAX_TEXT_LENGTH } from "@/lib/hive/types";
import type { FrameType, HiveCatalog, HiveState } from "@/lib/hive/types";
import type { HiveOutlineHandle } from "./hive-outline";
import { HiveSheetShell } from "./hive-sheet-shell";
import { useSheetSubmit } from "./use-sheet-submit";
import type { SubmitOps } from "./use-sheet-submit";

const FRAME_OPTIONS = choiceOptions(FRAME_TYPE_LABELS, FRAME_TYPES);

export interface FrameSheetProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  state: HiveState;
  catalog: HiveCatalog;
  boxId: string;
  slot: number;
  /** Sends the ops (source CARD); rejects on failure. */
  submit: SubmitOps;
  /** On close, focus returns to this frame's item in the outline. */
  outlineRef: RefObject<HiveOutlineHandle | null>;
}

interface FrameFormProps {
  initialType: FrameType;
  initialName: string;
  boxId: string;
  slot: number;
  submit: SubmitOps;
  /** Saved, or the hive changed meanwhile (the conflict sheet takes over). */
  onClose: () => void;
}

function FrameForm({ initialType, initialName, boxId, slot, submit, onClose }: FrameFormProps) {
  const [type, setType] = useState<FrameType>(initialType);
  const [name, setName] = useState(initialName);
  const { send, pending, error } = useSheetSubmit(submit);
  const trimmed = name.trim();
  const changed = type !== initialType || trimmed !== initialName.trim();

  async function save() {
    const outcome = await send([{ op: "setFrame", boxId, slot, type, name: trimmed === "" ? null : trimmed }]);
    if (outcome !== "failed") onClose();
  }

  return (
    <form
      className="flex flex-col gap-4 px-4 pb-4"
      onSubmit={(event) => {
        // Portal forms bubble their submit through the React tree (e.g. into an enclosing form).
        event.preventDefault();
        event.stopPropagation();
        if (changed && !pending) void save();
      }}
    >
      <div className="flex flex-col gap-1.5">
        <span id={`frame-${boxId}-${slot}-type`} className="text-sm font-medium">
          Art
        </span>
        <ChoiceGroup
          options={FRAME_OPTIONS}
          value={type}
          onChange={setType}
          labelledBy={`frame-${boxId}-${slot}-type`}
          className="grid-cols-2 sm:grid-cols-3"
        />
      </div>
      <div className="flex flex-col gap-1.5">
        <label htmlFor={`frame-${boxId}-${slot}-name`} className="text-sm font-medium">
          Name
        </label>
        <Input
          id={`frame-${boxId}-${slot}-name`}
          value={name}
          maxLength={MAX_TEXT_LENGTH}
          autoComplete="off"
          onChange={(event) => setName(event.target.value)}
          aria-describedby={`frame-${boxId}-${slot}-count`}
          className="h-11"
        />
        <p id={`frame-${boxId}-${slot}-count`} className="text-xs text-muted-foreground">
          {name.length} / {MAX_TEXT_LENGTH}
        </p>
      </div>
      {error ? (
        <p role="alert" className="text-sm text-destructive">
          {error}
        </p>
      ) : null}
      <SheetFooter className="p-0">
        <Button type="submit" size="touch" disabled={!changed || pending}>
          Speichern
        </Button>
      </SheetFooter>
    </form>
  );
}

/** Edit one frame of a box: its type and an optional name (spec 9.4). One `setFrame` per save. */
export function FrameSheet({ open, onOpenChange, state, catalog, boxId, slot, submit, outlineRef }: FrameSheetProps) {
  const box = state.stack.find((candidate) => candidate.id === boxId);
  const frame = box?.frames?.find((candidate) => candidate.slot === slot);

  return (
    <HiveSheetShell
      open={open}
      onOpenChange={onOpenChange}
      title={`Rähmchen ${slot}`}
      description={partDisplayName(state, catalog, boxId)}
      finalFocus={() => {
        outlineRef.current?.focusFrame(boxId, slot);
        return false;
      }}
    >
      {frame ? (
        <FrameForm
          // A different frame starts a fresh draft.
          key={`${boxId}#${slot}`}
          initialType={frame.type}
          initialName={frame.name ?? ""}
          boxId={boxId}
          slot={slot}
          submit={submit}
          onClose={() => onOpenChange(false)}
        />
      ) : (
        <p role="alert" className="px-4 pb-4 text-sm text-destructive">
          Dieses Rähmchen gibt es nicht mehr.
        </p>
      )}
    </HiveSheetShell>
  );
}