import type {
  CompletionDocTemplateOption,
  LinkedServiceTemplate,
  Service,
  ServiceWorkOrderType,
} from "@/domain/services/types/service";

function asRecord(raw: unknown): Record<string, unknown> {
  return typeof raw === "object" && raw !== null ? (raw as Record<string, unknown>) : {};
}

function readString(record: Record<string, unknown>, ...keys: string[]): string {
  for (const key of keys) {
    const value = record[key];
    if (typeof value === "string") return value.trim();
    if (typeof value === "number") return String(value);
  }
  return "";
}

function readId(record: Record<string, unknown>): string | number {
  const value = record.id ?? record.Id;
  return typeof value === "string" || typeof value === "number" ? value : "";
}

function readBool(record: Record<string, unknown>, ...keys: string[]): boolean {
  for (const key of keys) {
    const value = record[key];
    if (typeof value === "boolean") return value;
  }
  return false;
}

function mapWorkOrderType(value: unknown): ServiceWorkOrderType | null {
  if (typeof value === "number") {
    return value === 2 ? "PM" : value === 3 ? "Emergency" : value === 6 ? "Reactive" : null;
  }
  if (typeof value !== "string") return null;
  const normalized = value.trim().toLowerCase();
  return normalized === "pm" || normalized === "preventivemaintenance"
    ? "PM"
    : normalized === "emergency"
      ? "Emergency"
      : normalized === "reactive"
        ? "Reactive"
        : null;
}

function mapTemplate(raw: unknown): LinkedServiceTemplate | null {
  if (!raw) return null;
  const record = asRecord(raw);
  const id = readId(record);
  return id === "" ? null : { id, name: readString(record, "name", "Name") };
}

export function mapService(raw: unknown): Service {
  const record = asRecord(raw);
  const types = record.supportedWorkOrderTypes ?? record.SupportedWorkOrderTypes;
  return {
    id: readId(record),
    name: readString(record, "name", "Name"),
    trade: readString(record, "trade", "Trade"),
    iconKey: readString(record, "iconKey", "IconKey"),
    requiresCompletionDocument: readBool(
      record,
      "requiresCompletionDocument",
      "RequiresCompletionDocument",
    ),
    completionDocTemplate:
      mapTemplate(record.completionDocTemplate ?? record.CompletionDocTemplate) ??
      mapTemplate({
        id: record.completionDocTemplateId ?? record.CompletionDocTemplateId,
      }),
    isActive: readBool(record, "isActive", "IsActive"),
    supportedWorkOrderTypes: Array.isArray(types)
      ? types.flatMap((value) => {
          const mapped = mapWorkOrderType(value);
          return mapped ? [mapped] : [];
        })
      : [],
  };
}

export function mapServices(raw: unknown): Service[] {
  const items = asRecord(raw);
  const payload = Array.isArray(raw)
    ? raw
    : (items.items ?? items.Items ?? items.data ?? items.Data);
  return Array.isArray(payload)
    ? payload.map(mapService).filter((service) => service.id !== "")
    : [];
}

export function mapCompletionDocTemplates(raw: unknown): CompletionDocTemplateOption[] {
  const payload = Array.isArray(raw)
    ? raw
    : (() => {
        const record = asRecord(raw);
        return record.items ?? record.Items ?? record.data ?? record.Data;
      })();
  return Array.isArray(payload)
    ? payload.flatMap((item) => {
        const record = asRecord(item);
        const id = readId(record);
        return id === ""
          ? []
          : [
              {
                id,
                name: readString(record, "name", "Name"),
              } satisfies CompletionDocTemplateOption,
            ];
      })
    : [];
}