// server/utils/userConfig.ts - 用户自定义配置 JSON value 的归一化与合并
import type { Prisma } from "~~/prisma/generated/client";
import type { IUserSettingsUpdateRequest } from "~~/shared/types/settings";

export interface UserConfigValue {
  useCustomConfig: boolean;
  customApiBase: string | null;
  customApiKey: string | null;
  customModel: string | null;
  customMaxTokens: number | null;
  customTemperature: number | null;
}

export const DEFAULT_USER_CONFIG_VALUE: UserConfigValue = {
  useCustomConfig: false,
  customApiBase: null,
  customApiKey: null,
  customModel: null,
  customMaxTokens: null,
  customTemperature: null
};

const isRecord = (value: unknown): value is Record<string, unknown> =>
  typeof value === "object" && value !== null && !Array.isArray(value);

const cleanString = (value: unknown): string | null => {
  if (typeof value !== "string") return null;
  const trimmed = value.trim();
  return trimmed.length > 0 ? trimmed : null;
};

const cleanApiKey = (value: unknown): string | null => {
  if (typeof value !== "string") return null;
  return value.length > 0 ? value : null;
};

const cleanNumber = (value: unknown): number | null =>
  typeof value === "number" && Number.isFinite(value) ? value : null;

export const normalizeUserConfigValue = (
  value: unknown
): UserConfigValue => {
  if (!isRecord(value)) {
    return { ...DEFAULT_USER_CONFIG_VALUE };
  }

  return {
    useCustomConfig: value.useCustomConfig === true,
    customApiBase: cleanString(value.customApiBase),
    customApiKey: cleanApiKey(value.customApiKey),
    customModel: cleanString(value.customModel),
    customMaxTokens: cleanNumber(value.customMaxTokens),
    customTemperature: cleanNumber(value.customTemperature)
  };
};

export const mergeUserConfigUpdate = (
  current: UserConfigValue,
  req: IUserSettingsUpdateRequest
): UserConfigValue => {
  const next: UserConfigValue = { ...current };

  if (req.useCustomConfig !== undefined) {
    next.useCustomConfig = req.useCustomConfig;
  }
  if (req.customApiBase !== undefined) {
    next.customApiBase = cleanString(req.customApiBase);
  }
  // 空字符串表示不修改已保存的 key，避免用户保存表单时误清空密钥
  if (req.customApiKey !== undefined && req.customApiKey !== "") {
    next.customApiKey = cleanApiKey(req.customApiKey);
  }
  if (req.customModel !== undefined) {
    next.customModel = cleanString(req.customModel);
  }
  if (req.customMaxTokens !== undefined) {
    next.customMaxTokens = cleanNumber(req.customMaxTokens);
  }
  if (req.customTemperature !== undefined) {
    next.customTemperature = cleanNumber(req.customTemperature);
  }

  return next;
};

export const hasUserConfigMutation = (req: IUserSettingsUpdateRequest) =>
  req.useCustomConfig !== undefined ||
  req.customApiBase !== undefined ||
  (req.customApiKey !== undefined && req.customApiKey !== "") ||
  req.customModel !== undefined ||
  req.customMaxTokens !== undefined ||
  req.customTemperature !== undefined;

export const toUserConfigJson = (
  value: UserConfigValue
): Prisma.InputJsonObject => ({
  useCustomConfig: value.useCustomConfig,
  customApiBase: value.customApiBase,
  customApiKey: value.customApiKey,
  customModel: value.customModel,
  customMaxTokens: value.customMaxTokens,
  customTemperature: value.customTemperature
});