import {
  MODELS,
  monitoringRows,
  type ModelCategoryId,
  type ModelRecord,
  type ModelStatus,
  type MonitoringRow,
  type RankingStatus,
} from "~/features/operations/modelData";

export type OperationsApiMode = "mock" | "api";

export type OperationsModelListParams = {
  workspaceId?: string;
  bank?: string;
  category?: ModelCategoryId;
  status?: ModelStatus;
  keyword?: string;
  signal?: AbortSignal;
};

export type OperationsModelDto = {
  model_instance_id: string;
  bank_name: string;
  model_category: ModelCategoryId;
  model_name: string;
  model_id: string;
  model_version: string;
  model_status: ModelStatus;
  last_iteration_date: string;
  ranking_result: RankingStatus;
  ks: number;
  psi: number;
  ks_mom_drop: number;
  secondary_hits_6m: number;
  is_wuji_bank: boolean;
  last_processed_at: string | null;
  previous_advice: string;
  common_model_name: string | null;
};

export type MonthlyMonitoringResultDto = {
  model_instance_id: string;
  monitor_month: string;
  ranking_result: RankingStatus;
  ks: number;
  psi: number;
  ks_mom_drop: number;
  secondary_hits_6m: number;
};

type ApiEnvelope<T> = {
  data: T;
  meta?: Record<string, unknown>;
};

export class OperationsApiError extends Error {
  readonly status: number;
  readonly code?: string;

  constructor(message: string, status: number, code?: string) {
    super(message);
    this.name = "OperationsApiError";
    this.status = status;
    this.code = code;
  }
}

const configuredMode = import.meta.env.VITE_OPERATIONS_API_MODE;
export const operationsApiMode: OperationsApiMode = configuredMode === "api" ? "api" : "mock";
const API_BASE = "/api/v1/operations";

function requireWorkspaceId(workspaceId?: string): string {
  if (workspaceId) return workspaceId;
  throw new OperationsApiError("请先选择项目空间", 400, "WORKSPACE_REQUIRED");
}

async function request<T>(path: string, init: RequestInit = {}): Promise<T> {
  const response = await fetch(`${API_BASE}${path}`, {
    ...init,
    credentials: "same-origin",
    headers: {
      Accept: "application/json",
      ...init.headers,
    },
  });
  const payload = await response.json().catch(() => ({})) as ApiEnvelope<T> & {
    detail?: string | { code?: string; message?: string };
  };
  if (!response.ok) {
    const message = typeof payload.detail === "string"
      ? payload.detail
      : payload.detail?.message ?? `请求失败（HTTP ${response.status}）`;
    throw new OperationsApiError(message, response.status, typeof payload.detail === "object" ? payload.detail.code : undefined);
  }
  return payload.data;
}

function toModelRecord(dto: OperationsModelDto): ModelRecord {
  return {
    bank: dto.bank_name,
    category: dto.model_category,
    name: dto.model_name,
    modelId: dto.model_id,
    version: dto.model_version,
    status: dto.model_status,
    iteratedAt: dto.last_iteration_date,
    ranking: dto.ranking_result,
    ks: dto.ks,
    psi: dto.psi,
    ksDrop: dto.ks_mom_drop,
    secondaryHits: dto.secondary_hits_6m,
    wuji: dto.is_wuji_bank,
    processedAt: dto.last_processed_at,
    previousAdvice: dto.previous_advice,
    commonModel: dto.common_model_name,
  };
}

function mockDelay(signal?: AbortSignal): Promise<void> {
  return new Promise((resolve, reject) => {
    const timer = window.setTimeout(resolve, 160);
    signal?.addEventListener("abort", () => {
      window.clearTimeout(timer);
      reject(new DOMException("Request aborted", "AbortError"));
    }, { once: true });
  });
}

export async function listOperationsModels(params: OperationsModelListParams = {}): Promise<ModelRecord[]> {
  if (operationsApiMode === "mock") {
    await mockDelay(params.signal);
    const keyword = params.keyword?.trim().toLowerCase();
    return MODELS
      .filter((model) => !params.bank || model.bank === params.bank)
      .filter((model) => !params.category || model.category === params.category)
      .filter((model) => !params.status || model.status === params.status)
      .filter((model) => !keyword || `${model.bank} ${model.name} ${model.modelId} ${model.version}`.toLowerCase().includes(keyword))
      .map((model) => ({ ...model }));
  }

  const query = new URLSearchParams();
  query.set("workspace_id", requireWorkspaceId(params.workspaceId));
  if (params.bank) query.set("bank", params.bank);
  if (params.category) query.set("category", params.category);
  if (params.status) query.set("status", params.status);
  if (params.keyword) query.set("keyword", params.keyword);
  const suffix = query.size ? `?${query.toString()}` : "";
  const data = await request<OperationsModelDto[]>(`/models${suffix}`, { signal: params.signal });
  return data.map(toModelRecord);
}

export async function getOperationsModel(
  modelId: string,
  workspaceId?: string,
  signal?: AbortSignal,
): Promise<ModelRecord> {
  if (operationsApiMode === "mock") {
    await mockDelay(signal);
    const model = MODELS.find((item) => item.modelId === modelId);
    if (!model) throw new OperationsApiError("模型不存在", 404, "MODEL_NOT_FOUND");
    return { ...model };
  }
  const query = new URLSearchParams({ workspace_id: requireWorkspaceId(workspaceId) });
  const data = await request<OperationsModelDto>(`/models/${encodeURIComponent(modelId)}?${query.toString()}`, { signal });
  return toModelRecord(data);
}

export async function getMonthlyMonitoringResult(
  modelId: string,
  month: string,
  workspaceId?: string,
  signal?: AbortSignal,
): Promise<MonitoringRow> {
  if (operationsApiMode === "mock") {
    await mockDelay(signal);
    const result = monitoringRows(MODELS).find((item) => item.modelId === modelId && item.monitorMonth === month);
    if (!result) throw new OperationsApiError("该月份暂无监控结果", 404, "MONITOR_RESULT_NOT_FOUND");
    return { ...result };
  }
  const model = await getOperationsModel(modelId, workspaceId, signal);
  const query = new URLSearchParams({
    month,
    workspace_id: requireWorkspaceId(workspaceId),
  });
  const data = await request<MonthlyMonitoringResultDto>(
    `/models/${encodeURIComponent(modelId)}/monitor-results?${query.toString()}`,
    { signal },
  );
  return {
    ...model,
    monitorMonth: data.monitor_month,
    ranking: data.ranking_result,
    ks: data.ks,
    psi: data.psi,
    ksDrop: data.ks_mom_drop,
    secondaryHits: data.secondary_hits_6m,
  };
}