export interface GenerationStatusLike {
  status?: string | null;
  displayStatus?: string | null;
  pipelineStage?: string | null;
  shouldPoll?: boolean | null;
}

export type GenerationUiColor = 'default' | 'processing' | 'warning' | 'success' | 'error' | 'blue' | 'orange' | 'purple';

export interface GenerationUiState {
  status: string;
  displayStatus: string;
  pipelineStage: string;
  effectiveKey: string;
  label: string;
  color: GenerationUiColor;
  isActive: boolean;
  isSuccess: boolean;
  isFailure: boolean;
  isTerminal: boolean;
}

const ACTIVE_STATUS_KEYS = new Set(['pending', 'optimizing', 'generating']);
const ACTIVE_PIPELINE_STAGES = new Set([
  'queued', 'preparing', 'creating_provider_task', 'provider_result_staged',
  'waiting_remote', 'polling', 'result_ready', 'download_queued', 'downloading',
  'retry_waiting', 'recovery_inconsistent', 'upscale_queued', 'upscale_processing',
  'upscale_polling', 'upscale_downloading', 'upscale_finalizing', 'upscale_retry_waiting',
]);
const SUCCESS_KEYS = new Set(['completed', 'done']);
const FAILURE_KEYS = new Set(['failed', 'timeout', 'download_failed', 'upscale_failed']);
const TERMINAL_KEYS = new Set([...SUCCESS_KEYS, ...FAILURE_KEYS, 'deleted']);

const LABELS: Record<string, string> = {
  pending: '待处理', optimizing: '提词处理中', prompt_optimized: '待生成', generating: '生成中',
  queued: '已入队', preparing: '准备中', creating_provider_task: '创建供应商任务',
  provider_result_staged: '供应商结果已暂存', waiting_remote: '等待供应商结果', polling: '轮询供应商结果',
  result_ready: '远程结果已就绪', download_queued: '下载已入队', downloading: '下载中',
  retry_waiting: '下载等待重试', recovery_inconsistent: '恢复证据异常', upscale_queued: '超分已入队',
  upscale_processing: '本地超分处理中', upscale_polling: '轮询远程超分',
  upscale_downloading: '下载超分结果', upscale_finalizing: '超分结果最终化',
  upscale_retry_waiting: '超分等待重试', completed: '已完成', done: '已完成', timeout: '任务超时',
  download_failed: '下载失败', upscale_failed: '超分失败', failed: '失败', deleted: '已删除',
};

const COLOR_MAP: Record<string, GenerationUiColor> = {
  pending: 'default', optimizing: 'processing', prompt_optimized: 'blue', generating: 'warning',
  queued: 'processing', preparing: 'processing', creating_provider_task: 'processing',
  provider_result_staged: 'processing', waiting_remote: 'processing', polling: 'processing',
  result_ready: 'processing', download_queued: 'processing', downloading: 'processing', retry_waiting: 'orange',
  recovery_inconsistent: 'orange', upscale_queued: 'purple', upscale_processing: 'purple',
  upscale_polling: 'purple', upscale_downloading: 'purple', upscale_finalizing: 'purple',
  upscale_retry_waiting: 'orange', completed: 'success', done: 'success', failed: 'error',
  timeout: 'error', download_failed: 'error', upscale_failed: 'error', deleted: 'default',
};

const normalize = (value?: string | null): string => String(value || '').trim().toLowerCase();
const firstMatching = (values: string[], keys: Set<string>): string => values.find((item) => keys.has(item)) || '';

export const getGenerationStageLabel = (key?: string | null): string => {
  const normalized = normalize(key);
  return LABELS[normalized] || normalized || '未知状态';
};

export const getGenerationStatusColor = (key?: string | null): GenerationUiColor => {
  const normalized = normalize(key);
  return COLOR_MAP[normalized] || 'default';
};

export const resolveGenerationUiState = (value: GenerationStatusLike): GenerationUiState => {
  const status = normalize(value.status);
  const displayStatus = normalize(value.displayStatus);
  const pipelineStage = normalize(value.pipelineStage);
  const values = [pipelineStage, displayStatus, status].filter(Boolean);
  const failureKey = firstMatching(values, FAILURE_KEYS);
  const successKey = firstMatching(values, SUCCESS_KEYS);
  const deletedKey = firstMatching(values, new Set(['deleted']));
  const effectiveKey = failureKey || deletedKey || successKey || pipelineStage || displayStatus || status || 'pending';
  const isFailure = FAILURE_KEYS.has(effectiveKey);
  const isSuccess = SUCCESS_KEYS.has(effectiveKey);
  const isActive = typeof value.shouldPoll === 'boolean'
    ? value.shouldPoll
    : (!isFailure && !isSuccess && effectiveKey !== 'deleted' && (ACTIVE_PIPELINE_STAGES.has(pipelineStage) || ACTIVE_STATUS_KEYS.has(status) || ACTIVE_STATUS_KEYS.has(displayStatus)));

  return {
    status, displayStatus, pipelineStage, effectiveKey,
    label: getGenerationStageLabel(effectiveKey),
    color: getGenerationStatusColor(effectiveKey),
    isActive, isSuccess, isFailure,
    isTerminal: TERMINAL_KEYS.has(effectiveKey),
  };
};

export const isGenerationActive = (value: GenerationStatusLike): boolean => resolveGenerationUiState(value).isActive;
export const isGenerationSuccess = (value: GenerationStatusLike): boolean => resolveGenerationUiState(value).isSuccess;
export const isGenerationFailure = (value: GenerationStatusLike): boolean => resolveGenerationUiState(value).isFailure;
export const isGenerationTerminal = (value: GenerationStatusLike): boolean => resolveGenerationUiState(value).isTerminal;