import { useEffect, useRef, useState } from "react";

import { navigateTo } from "@/app/browser-location";
import { routePaths } from "@/app/route-paths";
import { createAudioContentCreateBody, deactivateAudioContent, updateAudioContent } from "@/features/audio-contents/api/audio-content-api";
import { uploadAudioContent } from "@/features/audio-contents/api/upload-audio-content";
import type { UploadAudioContentOptions, UploadAuthDependencies } from "@/features/audio-contents/api/upload-audio-content";
import { audioErrorMessage, coverErrorMessage, createInitialPrice, defaultAudioContentCreateSettings, isFutureLocalDateTime, parsePrice, toCreateRequest, toUpdateRequest } from "@/features/audio-contents/components/audio-content-form-helpers";
import type { AudioContentCreateSettings } from "@/features/audio-contents/components/audio-content-form-helpers";
import { AudioContentCreateOptions } from "@/features/audio-contents/components/AudioContentCreateOptions";
import { AudioContentThemeSelect } from "@/features/audio-contents/components/AudioContentThemeSelect";
import { ReleaseScheduleField } from "@/features/audio-contents/components/ReleaseScheduleField";
import type { ReleaseScheduleValue } from "@/features/audio-contents/components/ReleaseScheduleField";
import type { AudioContentDetail } from "@/features/audio-contents/model/types";
import { audioContentCreateResponseSchema } from "@/features/audio-contents/schemas/audio-content-schema";
import type { AudioContentTheme } from "@/features/audio-contents/schemas/audio-content-schema";
import { AUDIO_COVER_POLICY } from "@/features/audio-contents/validation/audio-cover-policy";
import type { ApiClient } from "@/shared/api/client";
import { ApiError } from "@/shared/api/api-error";
import type { CropRenderRequest } from "@/shared/lib/crop-image";
import { focusFirstInvalidControl } from "@/shared/lib/focus-first-invalid-control";
import { formatSeoulDateTime } from "@/shared/lib/formatters";
import { ConfirmDeactivateDialog } from "@/shared/ui/confirm-deactivate-dialog";
import { CanPriceField } from "@/shared/ui/can-price-field";
import { FileField } from "@/shared/ui/file-field";
import { ImageCropDialog } from "@/shared/ui/image-crop-dialog";
import type { CropSourceImage } from "@/shared/ui/image-crop-dialog";
import { TagInput } from "@/shared/ui/tag-input";
import { CAN_PRICE_MAX } from "@/shared/validation/can-price";
import { AUDIO_FILE_POLICY } from "@/shared/validation/audio-file-policy";
import { UnsavedChangesGuard } from "@/shared/ui/unsaved-changes-guard";
import { UploadProgress } from "@/shared/ui/upload-progress";
import type { UploadProgressStatus } from "@/shared/ui/upload-progress";

export type UploadAudioContentRequest = <Data>(options: UploadAudioContentOptions<Data>) => Promise<Data>;

type FieldName = "audio" | "cover" | "detail" | "form" | "price" | "releaseDate" | "tags" | "theme" | "title";
type FieldErrors = Partial<Record<FieldName, string>>;

type UploadState = {
  readonly progress: number;
  readonly status: UploadProgressStatus;
};

const errorIds = {
  detail: "audio-content-detail-error",
  price: "audio-content-price-error",
  releaseDate: "audio-content-release-date-error",
  tags: "audio-content-tags-error",
  theme: "audio-content-theme-error",
  title: "audio-content-title-error",
} as const;

export function AudioContentForm({ apiClient, audio, characterId, createCropSource, mode, renderCrop, themes, uploadAuth, uploadAudioContentRequest = uploadAudioContent }: { readonly apiClient: ApiClient; readonly audio?: AudioContentDetail; readonly characterId: string; readonly createCropSource: (file: File) => Promise<CropSourceImage>; readonly mode: "create" | "edit"; readonly renderCrop?: (request: CropRenderRequest) => Promise<File>; readonly themes: readonly AudioContentTheme[]; readonly uploadAuth?: UploadAuthDependencies; readonly uploadAudioContentRequest?: UploadAudioContentRequest }) {
  const [audioFile, setAudioFile] = useState<File | null>(null);
  const [createSettings, setCreateSettings] = useState<AudioContentCreateSettings>(defaultAudioContentCreateSettings);
  const [coverImage, setCoverImage] = useState<File | null>(null);
  const [cropSource, setCropSource] = useState<CropSourceImage | null>(null);
  const [detail, setDetail] = useState(audio?.detail ?? "");
  const [errors, setErrors] = useState<FieldErrors>({});
  const [isDeactivateDialogOpen, setIsDeactivateDialogOpen] = useState(false);
  const [isCoverPreparing, setIsCoverPreparing] = useState(false);
  const [isDeactivating, setIsDeactivating] = useState(false);
  const [deactivateError, setDeactivateError] = useState<string | undefined>();
  const [price, setPrice] = useState(createInitialPrice(audio?.price));
  const [releaseSchedule, setReleaseSchedule] = useState<ReleaseScheduleValue>({ publishMode: "immediate", releaseDateTime: "" });
  const [tags, setTags] = useState(audio?.tag ?? "");
  const [themeId, setThemeId] = useState<number | null>(null);
  const [title, setTitle] = useState(audio?.title ?? "");
  const [uploadState, setUploadState] = useState<UploadState>({ progress: 0, status: "idle" });
  const [abortController, setAbortController] = useState<AbortController | null>(null);
  const formRef = useRef<HTMLFormElement>(null);
  const coverSelectionIdRef = useRef(0);
  const isDeactivatingRef = useRef(false);
  const isSubmittingRef = useRef(false);
  const contentId = audio === undefined ? null : String(audio.contentId);
  const isDirty = title !== (audio?.title ?? "") || detail !== (audio?.detail ?? "") || tags !== (audio?.tag ?? "") || price !== createInitialPrice(audio?.price) || audioFile !== null || coverImage !== null || themeId !== null || releaseSchedule.publishMode !== "immediate" || releaseSchedule.releaseDateTime !== "" || createSettings !== defaultAudioContentCreateSettings;
  const isCoverSubmitBlocked = isCoverPreparing || cropSource !== null;
  const isPaid = (parsePrice(price) ?? 0) > 0;

  useEffect(() => () => cropSource?.release?.(), [cropSource]);

  function changePrice(value: string) {
    setPrice(value);
    if (mode === "create" && parsePrice(value) === 0) {
      setCreateSettings((current) => ({ ...current, purchaseOption: "BOTH", isGeneratePreview: false, isPointAvailable: false, previewStartTime: null, previewEndTime: null }));
    }
  }

  async function selectCoverImage(file: File | null) {
    const selectionId = coverSelectionIdRef.current + 1;
    coverSelectionIdRef.current = selectionId;
    if (file === null) {
      setCoverImage(null);
      setCropSource(null);
      setIsCoverPreparing(false);
      return;
    }
    setCoverImage(null);
    setCropSource(null);
    const coverError = coverErrorMessage(file, mode);
    if (coverError !== undefined) { setErrors((current) => ({ ...current, cover: coverError })); return; }
    setIsCoverPreparing(true);
    setErrors((current) => ({ ...current, cover: undefined }));
    try {
      const source = await createCropSource(file);
      if (coverSelectionIdRef.current === selectionId) {
        setCropSource(source);
      } else {
        source.release?.();
      }
    } catch {
      if (coverSelectionIdRef.current === selectionId) {
        setErrors((current) => ({ ...current, cover: "이미지 미리보기 준비에 실패했습니다." }));
      }
    } finally {
      if (coverSelectionIdRef.current === selectionId) {
        setIsCoverPreparing(false);
      }
    }
  }

  function validateForm(): FieldErrors {
    const parsedPrice = parsePrice(price);
    return {
      audio: audioErrorMessage(audioFile, mode),
      cover: isCoverSubmitBlocked ? "이미지 처리가 끝난 뒤 저장하세요." : coverErrorMessage(coverImage, mode),
      detail: detail.trim().length === 0 ? "상세 설명을 입력하세요." : undefined,
      price: parsedPrice === null || parsedPrice < 0 || parsedPrice > CAN_PRICE_MAX || !Number.isInteger(parsedPrice) ? "가격은 0 이상 99,999 이하 정수 캔으로 입력하세요." : undefined,
      releaseDate: releaseSchedule.publishMode === "scheduled" && !isFutureLocalDateTime(releaseSchedule.releaseDateTime) ? "미래 Asia/Seoul 시각을 입력하세요." : undefined,
      tags: tags.trim().length === 0 ? "태그를 입력하세요." : undefined,
      theme: mode === "create" && themeId === null ? "테마를 선택하세요." : undefined,
      title: title.trim().length === 0 ? "제목을 입력하세요." : undefined,
    };
  }

  function hasErrors(nextErrors: FieldErrors): boolean {
    return Object.values(nextErrors).some((error) => error !== undefined);
  }

  async function submitWithCurrentState() {
    if (isSubmittingRef.current) {
      return;
    }

    const nextErrors = validateForm();
    setErrors(nextErrors);
    if (hasErrors(nextErrors)) {
      queueMicrotask(() => focusFirstInvalidControl(formRef.current));
      return;
    }

    const parsedPrice = parsePrice(price);
    if (parsedPrice === null) {
      return;
    }
    isSubmittingRef.current = true;
    setUploadState({ progress: 0, status: "uploading" });
    try {
      if (mode === "create" && audioFile !== null && coverImage !== null && themeId !== null) {
        const request = toCreateRequest({ detail: detail.trim(), price: parsedPrice, releaseSchedule, settings: createSettings, tags: tags.trim(), themeId, title: title.trim() });
        const controller = new AbortController();
        setAbortController(controller);
        const result = await uploadAudioContentRequest({ auth: uploadAuth, authentication: "required", body: createAudioContentCreateBody({ characterId, contentFile: audioFile, coverImage, request }), method: "POST", onProgress: (progress) => setUploadState({ progress, status: "uploading" }), path: `/api/v2/admin/ai-characters/${encodeURIComponent(characterId)}/audio-contents`, responseSchema: audioContentCreateResponseSchema, signal: controller.signal });
        setAbortController(null);
        setUploadState({ progress: 100, status: "success" });
        navigateTo(routePaths.aiCharacterAudioContentDetail(characterId, String(result.contentId)), { successNotification: "오디오 콘텐츠를 생성했습니다." });
        return;
      }
      if (mode === "edit" && audio !== undefined && contentId !== null) {
        await updateAudioContent(apiClient, characterId, contentId, { coverImage: coverImage ?? undefined, request: toUpdateRequest({ audio, detail: detail.trim(), price: parsedPrice, tags: tags.trim(), title: title.trim() }) });
        setUploadState({ progress: 100, status: "success" });
        navigateTo(routePaths.aiCharacterAudioContentDetail(characterId, contentId), { successNotification: "오디오 콘텐츠를 저장했습니다." });
      }
    } catch (error) {
      setAbortController(null);
      if (error instanceof DOMException && error.name === "AbortError") {
        setErrors({});
        setUploadState((current) => ({ progress: current.progress, status: "canceled" }));
        return;
      }
      if (error instanceof ApiError && error.status === 415 && error.errorProperty === "contentFile") {
        setErrors({ audio: error.message });
      } else if (error instanceof ApiError && error.status === 415 && error.errorProperty === "coverImage") {
        setErrors({ cover: error.message });
      } else {
        setErrors({ form: error instanceof ApiError ? error.message : "오디오 콘텐츠 저장에 실패했습니다." });
      }
      setUploadState((current) => ({ progress: current.progress, status: "error" }));
    } finally {
      isSubmittingRef.current = false;
    }
  }

  async function submit(event: { readonly preventDefault: () => void }) {
    event.preventDefault();
    await submitWithCurrentState();
  }

  async function confirmDeactivate() {
    if (contentId === null || isDeactivatingRef.current) {
      return;
    }
    isDeactivatingRef.current = true;
    setIsDeactivating(true);
    setDeactivateError(undefined);
    try {
      await deactivateAudioContent(apiClient, characterId, contentId);
      navigateTo(routePaths.aiCharacterAudioContents(characterId), { successNotification: "오디오 콘텐츠를 비활성화했습니다." });
    } catch (error: unknown) {
      if (!(error instanceof Error)) {
        throw error;
      }
      setDeactivateError("비활성화하지 못했습니다. 다시 시도하세요.");
    } finally {
      isDeactivatingRef.current = false;
      setIsDeactivating(false);
    }
  }

  return (
    <UnsavedChangesGuard dirty={isDirty} impactDescription="저장하지 않은 오디오 콘텐츠 변경사항이 사라집니다." title="오디오 편집을 취소하시겠습니까?">
      {(requestRouteLeave) => (
        <section className="flex flex-col gap-4" aria-labelledby="audio-form-title">
          <div className="flex flex-col gap-2">
            <p className="text-xs font-semibold text-info">AUDIO CONTENTS</p>
            <h2 className="text-2xl font-bold leading-tight" id="audio-form-title">{mode === "create" ? "오디오 콘텐츠 생성" : "오디오 콘텐츠 수정"}</h2>
            <p className="text-sm text-muted-foreground">제목, 상세 설명, 태그는 저장 전 운영 기준에 맞게 검토하세요. 업로드 제한은 안내된 파일 정책을 따릅니다.</p>
          </div>
          <form className="flex flex-col gap-4 rounded-lg border border-border bg-card p-4" aria-label={mode === "create" ? "오디오 콘텐츠 생성 입력 화면" : "오디오 콘텐츠 수정 입력 화면"} onSubmit={(event) => void submit(event)} ref={formRef}>
            <FileField accept="image/jpeg,image/png" acceptDescription="JPEG 또는 PNG, 10MB 이하, 1:1 crop 후 최대 800×800px로 전송합니다." error={errors.cover} label="커버 이미지" onChange={(file) => void selectCoverImage(file)} value={coverImage} />
            {mode === "create" ? <FileField accept={AUDIO_FILE_POLICY.allowedMimeTypes.join(",")} acceptDescription="MP3, AAC, M4A, 최대 1,024,000,000 bytes. WAV는 지원하지 않습니다." error={errors.audio} label="오디오 파일" onChange={setAudioFile} value={audioFile} /> : <p className="rounded-lg border border-border bg-muted p-3 text-sm font-semibold text-muted-foreground">오디오 원본 파일은 수정할 수 없습니다.</p>}
            <label className="flex flex-col gap-2 text-sm font-semibold">제목<input aria-describedby={errors.title === undefined ? undefined : errorIds.title} aria-invalid={errors.title === undefined ? undefined : true} className="rounded-md border border-input bg-card px-3 py-2 text-base font-normal text-foreground" onChange={(event) => setTitle(event.currentTarget.value)} value={title} /></label>
            {errors.title === undefined ? null : <p className="text-sm font-semibold text-destructive" id={errorIds.title} role="alert">{errors.title}</p>}
            <label className="flex flex-col gap-2 text-sm font-semibold">상세 설명<textarea aria-describedby={errors.detail === undefined ? undefined : errorIds.detail} aria-invalid={errors.detail === undefined ? undefined : true} className="min-h-28 rounded-md border border-input bg-card px-3 py-2 text-base font-normal text-foreground" onChange={(event) => setDetail(event.currentTarget.value)} value={detail} /></label>
            {errors.detail === undefined ? null : <p className="text-sm font-semibold text-destructive" id={errorIds.detail} role="alert">{errors.detail}</p>}
            <TagInput error={errors.tags} errorId={errorIds.tags} label="태그" onChange={setTags} value={tags} />
            {mode === "create" ? <AudioContentThemeSelect error={errors.theme} errorId={errorIds.theme} onChange={setThemeId} themes={themes} value={themeId} /> : <p className="rounded-lg border border-border bg-muted p-3 text-sm font-semibold text-muted-foreground">테마: {audio?.themeStr ?? "-"} (수정 불가)</p>}
            <CanPriceField error={errors.price} errorId={errorIds.price} onChange={changePrice} value={price} />
            {mode === "create" ? <AudioContentCreateOptions isPaid={isPaid} onChange={setCreateSettings} value={createSettings} /> : null}
            {mode === "create" ? <ReleaseScheduleField error={errors.releaseDate} errorId={errorIds.releaseDate} onChange={setReleaseSchedule} value={releaseSchedule} /> : <p className="rounded-lg border border-border bg-muted p-3 text-sm font-semibold text-muted-foreground">공개일: {audio?.releaseDate == null ? "즉시 공개" : formatSeoulDateTime(audio.releaseDate)} (수정 불가)</p>}
            <p className="rounded-lg border border-border bg-muted p-3 text-sm font-semibold text-muted-foreground">시리즈: 현재 수정 화면에서는 변경할 수 없습니다.</p>
            {errors.form === undefined ? null : <p className="text-sm font-semibold text-destructive" role="alert">{errors.form}</p>}
            {uploadState.status === "idle" ? null : <UploadProgress fileName={audioFile?.name ?? coverImage?.name} onCancel={abortController === null ? undefined : () => abortController.abort()} onRetry={uploadState.status === "error" ? () => void submitWithCurrentState() : undefined} progress={uploadState.progress} status={uploadState.status} />}
            <div className="flex justify-end gap-2">
              {mode === "edit" ? <button className="rounded-md border border-input bg-card px-4 py-2 font-semibold hover:bg-accent" onClick={() => setIsDeactivateDialogOpen(true)} type="button">비활성화</button> : null}
              <button className="rounded-md border border-input bg-card px-4 py-2 font-semibold hover:bg-accent" onClick={(event) => requestRouteLeave(event.currentTarget, () => navigateTo(mode === "create" ? routePaths.aiCharacterAudioContents(characterId) : routePaths.aiCharacterAudioContentDetail(characterId, contentId ?? "")))} type="button">취소</button>
              <button className="rounded-md border border-input bg-primary px-4 py-2 font-semibold text-primary-foreground hover:bg-[var(--button-bg-hover)] active:bg-[var(--button-bg-active)] disabled:cursor-not-allowed disabled:opacity-60" disabled={uploadState.status === "uploading" || isCoverSubmitBlocked} type="submit">{mode === "create" ? "생성" : "저장"}</button>
            </div>
          </form>
          {cropSource === null ? null : <ImageCropDialog image={cropSource} onApply={(file) => { setCoverImage(file); setCropSource(null); setErrors((current) => ({ ...current, cover: undefined })); }} onCancel={() => { setCoverImage(null); setCropSource(null); setErrors((current) => ({ ...current, cover: undefined })); }} open policy={AUDIO_COVER_POLICY} renderCrop={renderCrop} />}
          <ConfirmDeactivateDialog confirmLabel="비활성화 확인" errorMessage={deactivateError} impactDescription={`${title || "선택한 오디오 콘텐츠"}의 목록 노출만 중지하며 콘텐츠는 보관됩니다.`} isPending={isDeactivating} onCancel={() => setIsDeactivateDialogOpen(false)} onConfirm={() => void confirmDeactivate()} open={isDeactivateDialogOpen} targetName="오디오 콘텐츠" />
        </section>
      )}
    </UnsavedChangesGuard>
  );
}