const DEFAULT_API_BASE_URL = "http://localhost:8080";

export const D4_METRICS_PATH = "/api/d4/metrics";

export type D4EventName =
  | "D4_COLLAB_CONFLICT_CREATED"
  | "D4_COLLAB_CONFLICT_RESOLVED"
  | "D4_COLLAB_EFFECTIVE"
  | "D4_COMM_MESSAGE_RESPONSE"
  | "D4_COMM_MESSAGE_SENT"
  | "D4_TASK_ASSIGNED"
  | "D4_TASK_COMPLETED";

export interface D4MetricsQuery {
  from?: string;
  to?: string;
  projectId?: number | string;
  taskType?: string;
  userId?: number | string;
  slaMs?: number | string;
}

export interface D4MetricsResponse {
  from: string;
  to: string;
  filter: {
    projectId: number | null;
    taskType: string | null;
    userId: number | null;
    slaMs: number | null;
  };
  taskCompletion: {
    assignedCount: number;
    completedCount: number;
    completionRate: number | null;
    onTimeCompletedCount: number | null;
    onTimeCompletionRate: number | null;
  };
  communication: {
    sentMessageCount: number;
    respondedMessageCount: number;
    averageResponseMs: number | null;
  };
  collaboration: {
    effectiveCollaborationCount: number;
  };
  conflict: {
    createdCount: number;
    resolvedCount: number;
    resolutionRate: number | null;
  };
  eventCounts: Record<D4EventName | string, number>;
  scan: {
    indexPattern: string;
    scannedEvents: number;
    maxEventsToScan: number;
    truncated: boolean;
  };
}

export const D4_EVENT_LABELS: Record<D4EventName, string> = {
  D4_COLLAB_CONFLICT_CREATED: "协作冲突创建",
  D4_COLLAB_CONFLICT_RESOLVED: "协作冲突解决",
  D4_COLLAB_EFFECTIVE: "有效协作",
  D4_COMM_MESSAGE_RESPONSE: "沟通响应",
  D4_COMM_MESSAGE_SENT: "沟通发送",
  D4_TASK_ASSIGNED: "任务分配",
  D4_TASK_COMPLETED: "任务完成",
};

export function getApiBaseUrl() {
  return (process.env.NEXT_PUBLIC_SEEC_ANALYSIS_API_BASE_URL || DEFAULT_API_BASE_URL).replace(/\/$/, "");
}

export function toD4UserId(userId: string | null | undefined) {
  if (!userId) {
    return undefined;
  }

  const parsed = Number(userId);
  return Number.isSafeInteger(parsed) ? parsed : undefined;
}

export function buildD4MetricsUrl(query: D4MetricsQuery = {}) {
  const url = new URL(`${getApiBaseUrl()}${D4_METRICS_PATH}`);

  Object.entries(query).forEach(([key, value]) => {
    if (value !== undefined && value !== null && `${value}`.trim() !== "") {
      url.searchParams.set(key, `${value}`);
    }
  });

  return url.toString();
}

export async function fetchD4Metrics(query: D4MetricsQuery = {}, signal?: AbortSignal) {
  const response = await fetch(buildD4MetricsUrl(query), {
    method: "GET",
    headers: {
      Accept: "application/json",
    },
    signal,
  });

  if (!response.ok) {
    let message = `D4 指标请求失败 (${response.status})`;

    try {
      const body = (await response.json()) as { message?: string; error?: string };
      message = body.message || body.error || message;
    } catch {
      // Keep the status based message when the response body is not JSON.
    }

    throw new Error(message);
  }

  return (await response.json()) as D4MetricsResponse;
}