import { useCallback, useEffect, useState } from 'react';
import axios from 'axios';

import { APP_ENDPOINTS } from '../../config/env';
import { resolveApiErrorMessage } from '../http/apiErrors';
import type { WorkspaceFileResponse, WorkspacePreviewMode, WorkspacePreviewState } from './types';
import {
  buildWorkspaceDownloadHref,
  buildWorkspacePreviewHref,
  buildWorkspaceRawHref,
  resolveWorkspaceDocumentPath,
} from './workspaceMarkdown';
import {
  isAudioPath,
  isHtmlPath,
  isImagePath,
  isVideoPath,
  workspaceFileAction,
} from './utils';
import type { WorkspaceNotifyOptions } from './workspaceShared';

export interface WorkspacePreviewLabels {
  fileReadFail: string;
  fileEditDisabled: string;
  fileSaveFail: string;
  fileSaved: string;
  urlCopied: string;
  urlCopyFail: string;
}

interface UseWorkspacePreviewOptions {
  selectedBotId: string;
  workspaceCurrentPath: string;
  workspaceDownloadExtensionSet: ReadonlySet<string>;
  loadWorkspaceTree: (botId: string, path?: string) => Promise<void>;
  notify: (message: string, options?: WorkspaceNotifyOptions) => void;
  t: WorkspacePreviewLabels;
  isZh: boolean;
}

function buildMediaPreviewState(path: string, mode: 'image' | 'html' | 'video' | 'audio'): WorkspacePreviewState {
  const fileExt = (path.split('.').pop() || '').toLowerCase();
  return {
    path,
    content: '',
    truncated: false,
    ext: fileExt ? `.${fileExt}` : '',
    isMarkdown: false,
    isImage: mode === 'image',
    isHtml: mode === 'html',
    isVideo: mode === 'video',
    isAudio: mode === 'audio',
  };
}

export function useWorkspacePreview({
  selectedBotId,
  workspaceCurrentPath,
  workspaceDownloadExtensionSet,
  loadWorkspaceTree,
  notify,
  t,
  isZh,
}: UseWorkspacePreviewOptions) {
  const [workspaceFileLoading, setWorkspaceFileLoading] = useState(false);
  const [workspacePreview, setWorkspacePreview] = useState<WorkspacePreviewState | null>(null);
  const [workspacePreviewMode, setWorkspacePreviewMode] = useState<WorkspacePreviewMode>('preview');
  const [workspacePreviewFullscreen, setWorkspacePreviewFullscreen] = useState(false);
  const [workspacePreviewSaving, setWorkspacePreviewSaving] = useState(false);
  const [workspacePreviewDraft, setWorkspacePreviewDraft] = useState('');

  const workspacePreviewCanEdit = Boolean(workspacePreview?.isMarkdown && !workspacePreview?.truncated);
  const workspacePreviewEditorEnabled = workspacePreviewCanEdit && workspacePreviewMode === 'edit';
  const workspacePreviewPath = workspacePreview?.path || '';
  const workspacePreviewContent = workspacePreview?.content || '';

  const getWorkspaceDownloadHref = useCallback((filePath: string, forceDownload: boolean = true) =>
    buildWorkspaceDownloadHref(selectedBotId, filePath, forceDownload),
  [selectedBotId]);

  const getWorkspaceRawHref = useCallback((filePath: string, forceDownload: boolean = false) =>
    buildWorkspaceRawHref(selectedBotId, filePath, forceDownload),
  [selectedBotId]);

  const getWorkspacePreviewHref = useCallback((filePath: string) => {
    const normalized = String(filePath || '').trim();
    if (!normalized) return '';
    return buildWorkspacePreviewHref(selectedBotId, normalized, { preferRaw: isHtmlPath(normalized) });
  }, [selectedBotId]);

  const closeWorkspacePreview = useCallback(() => {
    setWorkspacePreview(null);
    setWorkspacePreviewMode('preview');
    setWorkspacePreviewFullscreen(false);
    setWorkspacePreviewSaving(false);
    setWorkspacePreviewDraft('');
  }, []);

  const copyTextToClipboard = useCallback(async (textRaw: string, successMsg: string, failMsg: string) => {
    const text = String(textRaw || '');
    if (!text.trim()) return;
    try {
      if (navigator.clipboard?.writeText) {
        await navigator.clipboard.writeText(text);
      } else {
        const ta = document.createElement('textarea');
        ta.value = text;
        document.body.appendChild(ta);
        ta.select();
        document.execCommand('copy');
        ta.remove();
      }
      notify(successMsg, { tone: 'success' });
    } catch {
      notify(failMsg, { tone: 'error' });
    }
  }, [notify]);

  const openWorkspaceFilePreview = useCallback(async (path: string) => {
    const normalizedPath = String(path || '').trim();
    if (!selectedBotId || !normalizedPath) return;
    if (workspaceFileAction(normalizedPath, workspaceDownloadExtensionSet) === 'download') {
      window.open(getWorkspaceDownloadHref(normalizedPath, true), '_blank', 'noopener,noreferrer');
      return;
    }
    if (isImagePath(normalizedPath)) {
      setWorkspacePreview(buildMediaPreviewState(normalizedPath, 'image'));
      return;
    }
    if (isHtmlPath(normalizedPath)) {
      setWorkspacePreview(buildMediaPreviewState(normalizedPath, 'html'));
      return;
    }
    if (isVideoPath(normalizedPath)) {
      setWorkspacePreview(buildMediaPreviewState(normalizedPath, 'video'));
      return;
    }
    if (isAudioPath(normalizedPath)) {
      setWorkspacePreview(buildMediaPreviewState(normalizedPath, 'audio'));
      return;
    }
    setWorkspaceFileLoading(true);
    try {
      const res = await axios.get<WorkspaceFileResponse>(`${APP_ENDPOINTS.apiBase}/bots/${selectedBotId}/workspace/file`, {
        params: { path, max_bytes: 400000 },
      });
      const filePath = res.data.path || path;
      const textExt = (filePath.split('.').pop() || '').toLowerCase();
      let content = res.data.content || '';
      if (textExt === 'json') {
        try {
          content = JSON.stringify(JSON.parse(content), null, 2);
        } catch {
          // Keep original content when JSON is not strictly parseable.
        }
      }
      setWorkspacePreview({
        path: filePath,
        content,
        truncated: Boolean(res.data.truncated),
        ext: textExt ? `.${textExt}` : '',
        isMarkdown: textExt === 'md' || Boolean(res.data.is_markdown),
        isImage: false,
        isHtml: false,
        isVideo: false,
        isAudio: false,
      });
    } catch (error: unknown) {
      const msg = resolveApiErrorMessage(error, t.fileReadFail);
      notify(msg, { tone: 'error' });
    } finally {
      setWorkspaceFileLoading(false);
    }
  }, [getWorkspaceDownloadHref, notify, selectedBotId, t.fileReadFail, workspaceDownloadExtensionSet]);

  const saveWorkspacePreviewMarkdown = useCallback(async () => {
    if (!selectedBotId || !workspacePreview?.isMarkdown) return;
    if (workspacePreview.truncated) {
      notify(t.fileEditDisabled, { tone: 'warning' });
      return;
    }
    setWorkspacePreviewSaving(true);
    try {
      const res = await axios.put<WorkspaceFileResponse>(
        `${APP_ENDPOINTS.apiBase}/bots/${selectedBotId}/workspace/file`,
        { content: workspacePreviewDraft },
        { params: { path: workspacePreview.path } },
      );
      const filePath = res.data.path || workspacePreview.path;
      const textExt = (filePath.split('.').pop() || '').toLowerCase();
      const content = res.data.content || workspacePreviewDraft;
      setWorkspacePreview({
        ...workspacePreview,
        path: filePath,
        content,
        truncated: false,
        ext: textExt ? `.${textExt}` : '',
        isMarkdown: textExt === 'md' || textExt === 'markdown' || Boolean(res.data.is_markdown),
      });
      notify(t.fileSaved, { tone: 'success' });
      void loadWorkspaceTree(selectedBotId, workspaceCurrentPath);
    } catch (error: unknown) {
      notify(resolveApiErrorMessage(error, t.fileSaveFail), { tone: 'error' });
    } finally {
      setWorkspacePreviewSaving(false);
    }
  }, [
    loadWorkspaceTree,
    notify,
    selectedBotId,
    t.fileEditDisabled,
    t.fileSaveFail,
    t.fileSaved,
    workspaceCurrentPath,
    workspacePreview,
    workspacePreviewDraft,
  ]);

  const triggerWorkspaceFileDownload = useCallback((filePath: string) => {
    if (!selectedBotId) return;
    const normalized = String(filePath || '').trim();
    if (!normalized) return;
    const filename = normalized.split('/').pop() || 'workspace-file';
    const link = document.createElement('a');
    link.href = getWorkspaceDownloadHref(normalized, true);
    link.download = filename;
    link.rel = 'noopener noreferrer';
    document.body.appendChild(link);
    link.click();
    link.remove();
  }, [getWorkspaceDownloadHref, selectedBotId]);

  const copyWorkspacePreviewUrl = useCallback(async (filePath: string) => {
    const normalized = String(filePath || '').trim();
    if (!selectedBotId || !normalized) return;
    const hrefRaw = getWorkspacePreviewHref(normalized);
    const href = (() => {
      try {
        return new URL(hrefRaw, window.location.origin).href;
      } catch {
        return hrefRaw;
      }
    })();
    await copyTextToClipboard(href, t.urlCopied, t.urlCopyFail);
  }, [copyTextToClipboard, getWorkspacePreviewHref, selectedBotId, t.urlCopied, t.urlCopyFail]);

  const copyWorkspacePreviewPath = useCallback(async (filePath: string) => {
    const normalized = String(filePath || '').trim();
    if (!normalized) return;
    await copyTextToClipboard(
      normalized,
      isZh ? '文件路径已复制' : 'File path copied',
      isZh ? '文件路径复制失败' : 'Failed to copy file path',
    );
  }, [copyTextToClipboard, isZh]);

  const resolveWorkspaceMediaSrc = useCallback((srcRaw: string, baseFilePath?: string): string => {
    const src = String(srcRaw || '').trim();
    if (!src || !selectedBotId) return src;
    const resolvedWorkspacePath = resolveWorkspaceDocumentPath(src, baseFilePath);
    if (resolvedWorkspacePath) {
      return getWorkspacePreviewHref(resolvedWorkspacePath);
    }
    const lower = src.toLowerCase();
    if (lower.startsWith('data:') || lower.startsWith('blob:') || lower.startsWith('http://') || lower.startsWith('https://')) {
      return src;
    }
    return src;
  }, [getWorkspacePreviewHref, selectedBotId]);

  const resetWorkspacePreviewState = useCallback(() => {
    setWorkspaceFileLoading(false);
    setWorkspacePreview(null);
    setWorkspacePreviewMode('preview');
    setWorkspacePreviewFullscreen(false);
    setWorkspacePreviewSaving(false);
    setWorkspacePreviewDraft('');
  }, []);

  useEffect(() => {
    if (!workspacePreviewPath) {
      setWorkspacePreviewMode('preview');
      setWorkspacePreviewSaving(false);
      setWorkspacePreviewDraft('');
      return;
    }
    setWorkspacePreviewSaving(false);
    setWorkspacePreviewDraft(workspacePreviewContent);
  }, [workspacePreviewContent, workspacePreviewPath]);

  return {
    closeWorkspacePreview,
    copyWorkspacePreviewPath,
    copyWorkspacePreviewUrl,
    getWorkspaceDownloadHref,
    getWorkspacePreviewHref,
    getWorkspaceRawHref,
    openWorkspaceFilePreview,
    resetWorkspacePreviewState,
    resolveWorkspaceMediaSrc,
    saveWorkspacePreviewMarkdown,
    setWorkspacePreviewDraft,
    setWorkspacePreviewFullscreen,
    setWorkspacePreviewMode,
    triggerWorkspaceFileDownload,
    workspaceFileLoading,
    workspacePreview,
    workspacePreviewCanEdit,
    workspacePreviewDraft,
    workspacePreviewEditorEnabled,
    workspacePreviewFullscreen,
    workspacePreviewMode,
    workspacePreviewSaving,
  };
}