/**
 * useWorkspaceEditor Hook
 *
 * State management for the workspace editor page.
 * Loads pending file edit proposals from the API,
 * provides accept/reject actions, and tracks the active tab.
 */

import { useState, useCallback, useEffect } from 'react';
import api from '../../../api';

export interface EditorFileEdit {
  id: string;
  fileId: string;
  fileName: string;
  mimeType: string;
  oldContent: string;
  newContent: string;
  status: 'pending' | 'accepted' | 'rejected';
  workflowId: string;
}

interface UseWorkspaceEditorReturn {
  edits: EditorFileEdit[];
  activeEditId: string | null;
  isLoading: boolean;
  setActiveEditId: (id: string | null) => void;
  acceptEdit: (editId: string) => Promise<void>;
  rejectEdit: (editId: string) => Promise<void>;
  acceptAll: () => Promise<void>;
  rejectAll: () => Promise<void>;
  refresh: () => void;
  pendingCount: number;
}

export function useWorkspaceEditor(instanceId: string): UseWorkspaceEditorReturn {
  const [edits, setEdits] = useState<EditorFileEdit[]>([]);
  const [activeEditId, setActiveEditId] = useState<string | null>(null);
  const [isLoading, setIsLoading] = useState(false);

  const refresh = useCallback(() => {
    if (!instanceId) return;
    setIsLoading(true);
    api.get(`/api/workspace/${instanceId}/pending-edits`)
      .then(res => {
        const loadedEdits: EditorFileEdit[] = (res.data.edits || []).map((e: any) => ({
          id: e.id,
          fileId: e.fileId || '',
          fileName: e.fileName || '',
          mimeType: e.mimeType || '',
          oldContent: e.oldContent || '',
          newContent: e.newContent || '',
          status: e.status || 'pending',
          workflowId: e.workflowId || '',
        }));
        setEdits(loadedEdits);
        if (loadedEdits.length > 0 && !activeEditId) {
          setActiveEditId(loadedEdits[0].id);
        }
      })
      .catch(err => console.error('Failed to load pending edits:', err))
      .finally(() => setIsLoading(false));
  }, [instanceId, activeEditId]);

  useEffect(() => {
    refresh();
  }, [instanceId]); // eslint-disable-line react-hooks/exhaustive-deps

  const acceptEdit = useCallback(async (editId: string) => {
    if (!instanceId) return;
    setEdits(prev => prev.map(e => (e.id === editId ? { ...e, status: 'accepted' as const } : e)));
    try {
      await api.post(`/api/workspace/${instanceId}/edit/${editId}/accept`);
    } catch (err) {
      console.error('Failed to accept edit:', err);
      setEdits(prev => prev.map(e => (e.id === editId ? { ...e, status: 'pending' as const } : e)));
    }
  }, [instanceId]);

  const rejectEdit = useCallback(async (editId: string) => {
    if (!instanceId) return;
    setEdits(prev => prev.map(e => (e.id === editId ? { ...e, status: 'rejected' as const } : e)));
    try {
      await api.post(`/api/workspace/${instanceId}/edit/${editId}/reject`);
    } catch (err) {
      console.error('Failed to reject edit:', err);
      setEdits(prev => prev.map(e => (e.id === editId ? { ...e, status: 'pending' as const } : e)));
    }
  }, [instanceId]);

  const acceptAll = useCallback(async () => {
    if (!instanceId) return;
    setEdits(prev => prev.map(e => (e.status === 'pending' ? { ...e, status: 'accepted' as const } : e)));
    try {
      await api.post(`/api/workspace/${instanceId}/edit/accept-all`);
    } catch (err) {
      console.error('Failed to accept all edits:', err);
      refresh();
    }
  }, [instanceId, refresh]);

  const rejectAll = useCallback(async () => {
    if (!instanceId) return;
    setEdits(prev => prev.map(e => (e.status === 'pending' ? { ...e, status: 'rejected' as const } : e)));
    try {
      await api.post(`/api/workspace/${instanceId}/edit/reject-all`);
    } catch (err) {
      console.error('Failed to reject all edits:', err);
      refresh();
    }
  }, [instanceId, refresh]);

  const pendingCount = edits.filter(e => e.status === 'pending').length;

  return {
    edits,
    activeEditId,
    isLoading,
    setActiveEditId,
    acceptEdit,
    rejectEdit,
    acceptAll,
    rejectAll,
    refresh,
    pendingCount,
  };
}