import {
  DOC_STATUS_API,
  WORK_ORDER_TYPE_API_TO_FE,
} from "@/domain/work-orders/types/work-order-board";
import type { CompletionDocStatus } from "@/domain/work-orders/types/work-order-table-row";
import type { WOType } from "@/domain/work-orders/types/work-order-wizard";

// SH-126/SH-184: Add-On is a backend-authoritative indicator (`isAddOn`), not a
// selectable business type, so it is no longer part of the WOType union.
const DETAIL_WO_TYPES = new Set(["PM", "Reactive", "Emergency", "Overdue"]);

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;
    }
    if (typeof value === "number") {
      return String(value);
    }
  }
  return "";
}

function readNumber(record: Record<string, unknown>, ...keys: string[]): number | null {
  for (const key of keys) {
    const value = record[key];
    if (typeof value === "number") {
      return value;
    }
    if (typeof value === "string" && value !== "") {
      const parsed = Number(value);
      if (!Number.isNaN(parsed)) {
        return parsed;
      }
    }
  }
  return null;
}

/** Authoritative WO type only — never falls back to integration `source`. */
export function readDetailWoType(record: Record<string, unknown>): WOType | "" {
  const numeric =
    readNumber(record, "workOrderType", "WorkOrderType") ?? readNumber(record, "type", "Type");
  if (numeric != null && WORK_ORDER_TYPE_API_TO_FE[numeric]) {
    return WORK_ORDER_TYPE_API_TO_FE[numeric] as WOType;
  }

  const raw = readString(
    record,
    "workOrderType",
    "WorkOrderType",
    "type",
    "Type",
    "woType",
    "WoType",
  );
  if (DETAIL_WO_TYPES.has(raw)) {
    return raw as WOType;
  }
  return "";
}

export function readDetailDocStatus(record: Record<string, unknown>): CompletionDocStatus {
  const numeric = readNumber(record, "docStatus", "DocStatus");
  if (numeric === DOC_STATUS_API.Yes) return "Yes";
  if (numeric === DOC_STATUS_API.No) return "No";
  if (numeric === DOC_STATUS_API.NotNeeded) return "NN";

  const nestedCompletion = asRecord(record.completion ?? record.Completion);
  const nestedNumeric = readNumber(nestedCompletion, "docStatus", "DocStatus");
  if (nestedNumeric === DOC_STATUS_API.Yes) return "Yes";
  if (nestedNumeric === DOC_STATUS_API.No) return "No";
  if (nestedNumeric === DOC_STATUS_API.NotNeeded) return "NN";

  const raw = readString(record, "docStatus", "DocStatus", "completionDoc", "CompletionDoc");
  if (raw === "Yes" || raw === "No" || raw === "NN") {
    return raw;
  }
  if (raw === "NotNeeded") {
    return "NN";
  }
  return "";
}

export function readDetailMediaCount(record: Record<string, unknown>): number {
  const explicit = readNumber(record, "mediaCount", "MediaCount");
  if (explicit != null) {
    return explicit;
  }
  const media = record.media ?? record.Media;
  if (Array.isArray(media)) {
    return media.length;
  }
  return 0;
}