import type {
  ExternalGenerationJobStatusRecord,
  ExternalGenerationQueueOverview,
  ExternalGenerationTaskRecord,
} from '../../../packages/shared/src/contracts/externalGeneration';

export type ExternalGenerationQueueStatus = {
  currentStatus?: 'queued' | 'running' | 'completed' | 'failed' | null;
  currentProgress?: number | null;
  pendingCount?: number | null;
  runningCount?: number | null;
  tasks?: ExternalGenerationTaskRecord[] | null;
  unacknowledgedTerminalCount?: number | null;
};

export type ExternalGenerationQueueTaskPresentation = {
  id: string;
  title: string;
  statusLabel: string;
  priceLabel: string;
  detail: string;
  tone: 'profile' | 'danger' | 'success';
};

export type ExternalGenerationQueuePresentation = {
  statusLabel: string | null;
  progressLabel: string | null;
  pendingLabel: string;
  runningLabel: string;
  pendingCount: number;
  runningCount: number;
  unacknowledgedTerminalCount: number;
  progress: number | null;
  tasks: ExternalGenerationQueueTaskPresentation[];
  shouldShow: boolean;
};

export function buildExternalGenerationQueueStatus(
  overview: ExternalGenerationQueueOverview | null,
  job: ExternalGenerationJobStatusRecord | null,
  tasks: ExternalGenerationTaskRecord[] | null = null,
): ExternalGenerationQueueStatus | null {
  if (!overview && !job && !tasks?.length) {
    return null;
  }

  return {
    currentStatus: job?.status ?? null,
    currentProgress: job?.progress ?? null,
    pendingCount: overview?.pendingCount ?? null,
    runningCount: overview?.runningCount ?? null,
    unacknowledgedTerminalCount:
      overview?.unacknowledgedTerminalCount ?? null,
    tasks,
  };
}

function isActiveExternalGenerationStatus(
  status: ExternalGenerationQueueStatus['currentStatus'],
) {
  return status === 'queued' || status === 'running';
}

function isUnacknowledgedExternalGenerationTerminalTask(
  task: ExternalGenerationTaskRecord,
) {
  return (
    (task.status === 'completed' || task.status === 'failed') &&
    !task.notificationAcknowledgedAt
  );
}

export function shouldUseFastExternalGenerationTaskPolling(
  status: ExternalGenerationQueueStatus | null | undefined,
) {
  const pendingCount = normalizeExternalGenerationQueueCount(
    status?.pendingCount,
  );
  const runningCount = normalizeExternalGenerationQueueCount(
    status?.runningCount,
  );
  const unacknowledgedTerminalCount = normalizeExternalGenerationQueueCount(
    status?.unacknowledgedTerminalCount,
  );

  return Boolean(
    isActiveExternalGenerationStatus(status?.currentStatus ?? null) ||
      pendingCount > 0 ||
      runningCount > 0 ||
      unacknowledgedTerminalCount > 0 ||
      (status?.tasks ?? []).some(
        (task) =>
          task.status === 'queued' ||
          task.status === 'running' ||
          isUnacknowledgedExternalGenerationTerminalTask(task),
      ),
  );
}

export function resolveExternalGenerationQueueStatusLabel(
  status: ExternalGenerationQueueStatus['currentStatus'],
) {
  if (status === 'queued') {
    return '排队中';
  }

  if (status === 'running') {
    return '生成中';
  }

  if (status === 'failed') {
    return '生成失败';
  }

  if (status === 'completed') {
    return '已完成';
  }

  return null;
}

function resolveExternalGenerationQueueOverviewLabel(
  pendingCount: number,
  runningCount: number,
) {
  if (runningCount > 0) {
    return '生成中';
  }

  if (pendingCount > 0) {
    return '排队中';
  }

  return null;
}

export function normalizeExternalGenerationQueueCount(
  value: number | null | undefined,
) {
  if (typeof value !== 'number' || !Number.isFinite(value)) {
    return 0;
  }

  return Math.max(0, Math.round(value));
}

export function normalizeExternalGenerationQueueProgress(
  value: number | null | undefined,
) {
  if (typeof value !== 'number' || !Number.isFinite(value)) {
    return null;
  }

  return Math.max(0, Math.min(100, Math.round(value)));
}

export function buildExternalGenerationTaskPresentation(
  task: ExternalGenerationTaskRecord,
): ExternalGenerationQueueTaskPresentation {
  const statusLabel = resolveExternalGenerationQueueStatusLabel(task.status) ?? '待处理';
  return {
    id: task.jobId,
    title: task.requestLabel.trim() || task.jobKind,
    statusLabel,
    priceLabel:
      task.priceMudPoints > 0 ? `${task.priceMudPoints}泥点` : '未计费',
    detail: task.error?.trim() || task.phaseDetail || task.updatedAt,
    tone:
      task.status === 'failed'
        ? 'danger'
        : task.status === 'completed'
          ? 'success'
          : 'profile',
  };
}

export function buildExternalGenerationQueuePresentation(
  status: ExternalGenerationQueueStatus | null | undefined,
): ExternalGenerationQueuePresentation {
  const pendingCount = normalizeExternalGenerationQueueCount(
    status?.pendingCount,
  );
  const runningCount = normalizeExternalGenerationQueueCount(
    status?.runningCount,
  );
  const unacknowledgedTerminalCount = normalizeExternalGenerationQueueCount(
    status?.unacknowledgedTerminalCount,
  );
  const progress = normalizeExternalGenerationQueueProgress(
    status?.currentProgress,
  );
  const isCompletedCurrentJob = status?.currentStatus === 'completed';
  const currentStatusLabel = resolveExternalGenerationQueueStatusLabel(
    status?.currentStatus ?? null,
  );
  const overviewStatusLabel = resolveExternalGenerationQueueOverviewLabel(
    pendingCount,
    runningCount,
  );
  const statusLabel = isCompletedCurrentJob
    ? overviewStatusLabel
    : (currentStatusLabel ?? overviewStatusLabel);
  const progressValue = isCompletedCurrentJob ? null : progress;

  return {
    statusLabel,
    progressLabel: progressValue == null ? null : `${progressValue}%`,
    pendingLabel: pendingCount.toString(),
    runningLabel: runningCount.toString(),
    pendingCount,
    runningCount,
    unacknowledgedTerminalCount,
    progress: progressValue,
    tasks: (status?.tasks ?? [])
      .slice(0, 5)
      .map(buildExternalGenerationTaskPresentation),
    shouldShow: Boolean(
      statusLabel ||
        pendingCount > 0 ||
        runningCount > 0 ||
        unacknowledgedTerminalCount > 0 ||
        (status?.tasks?.length ?? 0) > 0,
    ),
  };
}