/**
 * Jotai atoms for data export state management.
 * Manages export jobs, progress, and download state.
 *
 * Requirements: 8.1, 8.2, 8.3, 8.4, 8.6
 */
import { atom } from 'jotai';

/**
 * Export format type
 */
export type ExportFormat = 'json' | 'csv' | 'coco' | 'yolo' | 'pascal_voc' | 'sharegpt' | 'alpaca';

/**
 * Export status type
 */
export type ExportStatus = 'pending' | 'processing' | 'completed' | 'failed';

/**
 * Status filter type for export
 */
export type StatusFilter = 'all' | 'completed' | 'pending' | 'in_progress';

/**
 * Export request interface
 */
export interface ExportRequest {
  format: ExportFormat;
  status_filter: StatusFilter;
  include_metadata: boolean;
}

/**
 * Export job interface
 */
export interface ExportJob {
  id: string;
  project_id: string;
  format: ExportFormat;
  status: ExportStatus;
  status_filter: StatusFilter;
  include_metadata: boolean;
  file_path: string | null;
  download_url: string | null;
  error_message: string | null;
  created_at: string;
  completed_at: string | null;
  total_tasks: number;
  exported_tasks: number;
}

/**
 * Export progress interface
 */
export interface ExportProgress {
  id: string;
  status: ExportStatus;
  progress: number;
  total_tasks: number;
  exported_tasks: number;
  error_message: string | null;
}

/**
 * Atom storing the current export job
 */
export const exportJobAtom = atom<ExportJob | null>(null);

/**
 * Atom storing export progress
 */
export const exportProgressAtom = atom<number>(0);

/**
 * Atom tracking export loading state
 */
export const exportLoadingAtom = atom<boolean>(false);

/**
 * Atom storing export-related errors
 */
export const exportErrorAtom = atom<string | null>(null);

/**
 * Atom storing export dialog open state
 */
export const exportDialogOpenAtom = atom<boolean>(false);

/**
 * Atom storing export request configuration
 */
export const exportRequestAtom = atom<ExportRequest>({
  format: 'json',
  status_filter: 'all',
  include_metadata: true,
});

/**
 * Atom storing export history (list of past exports)
 */
export const exportHistoryAtom = atom<ExportJob[]>([]);

/**
 * Derived atom to check if export is in progress
 */
export const isExportingAtom = atom((get) => {
  const job = get(exportJobAtom);
  return job?.status === 'pending' || job?.status === 'processing';
});

/**
 * Derived atom to check if export is completed
 */
export const isExportCompletedAtom = atom((get) => {
  const job = get(exportJobAtom);
  return job?.status === 'completed';
});

/**
 * Derived atom to check if export failed
 */
export const isExportFailedAtom = atom((get) => {
  const job = get(exportJobAtom);
  return job?.status === 'failed';
});

/**
 * Derived atom to get download URL
 */
export const exportDownloadUrlAtom = atom((get) => {
  const job = get(exportJobAtom);
  return job?.download_url ?? null;
});

/**
 * Write-only atom to reset export state
 */
export const resetExportAtom = atom(null, (get, set) => {
  set(exportJobAtom, null);
  set(exportProgressAtom, 0);
  set(exportErrorAtom, null);
  set(exportRequestAtom, {
    format: 'json',
    status_filter: 'all',
    include_metadata: true,
  });
});

/**
 * Write-only atom to open export dialog
 */
export const openExportDialogAtom = atom(null, (get, set) => {
  set(exportDialogOpenAtom, true);
  set(resetExportAtom);
});

/**
 * Write-only atom to close export dialog
 */
export const closeExportDialogAtom = atom(null, (get, set) => {
  set(exportDialogOpenAtom, false);
});

/**
 * Export format options for UI
 */
export const exportFormatOptions: Array<{
  value: ExportFormat;
  label: string;
  description: string;
}> = [
  {
    value: 'json',
    label: 'JSON',
    description: '原始 JSON 格式，包含完整数据',
  },
  {
    value: 'csv',
    label: 'CSV',
    description: '表格格式，适合数据分析',
  },
  {
    value: 'coco',
    label: 'COCO',
    description: '目标检测标准格式',
  },
  {
    value: 'yolo',
    label: 'YOLO',
    description: 'YOLO 训练格式',
  },
  {
    value: 'pascal_voc',
    label: 'VOC',
    description: 'PascalVOC XML 格式',
  },
  {
    value: 'sharegpt',
    label: 'ShareGPT',
    description: '对话模型训练格式',
  },
  {
    value: 'alpaca',
    label: 'Alpaca',
    description: 'LLM 指令微调格式',
  },
];

/**
 * Status filter options for UI
 */
export const statusFilterOptions: Array<{
  value: StatusFilter;
  label: string;
}> = [
  { value: 'all', label: '全部' },
  { value: 'completed', label: '已完成' },
  { value: 'in_progress', label: '进行中' },
  { value: 'pending', label: '待处理' },
];