import type {
  VendorCompanyRoster,
  VendorPreferredContact,
  VendorRosterBlockedWorkOrder,
  VendorRosterConflict,
  VendorRosterConflictKind,
  VendorRosterTechnician,
} from "@/domain/vendors/types/vendor";
import { toCanonicalPhone } from "@/domain/vendors/mappers/vendor-mapper";

const PREFERRED_CONTACT_VALUES = new Set<VendorPreferredContact>(["Phone", "Email", "Text"]);

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

function readPreferredContact(record: Record<string, unknown>): VendorPreferredContact | undefined {
  const raw = record.preferredContact ?? record.PreferredContact;
  if (typeof raw === "string") {
    const normalized = raw.trim();
    if (PREFERRED_CONTACT_VALUES.has(normalized as VendorPreferredContact)) {
      return normalized as VendorPreferredContact;
    }
    const lowered = normalized.toLowerCase();
    if (lowered === "phone" || lowered === "call") return "Phone";
    if (lowered === "email" || lowered === "e-mail") return "Email";
    if (lowered === "text" || lowered === "sms") return "Text";
  }
  return undefined;
}

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

function readCompanyId(record: Record<string, unknown>): string | number | null {
  const value = readId(record, "companyId", "CompanyId");
  return value ?? null;
}

export function mapRosterTechnician(raw: unknown): VendorRosterTechnician {
  const item = asRecord(raw);
  return {
    id: readId(item, "id", "Id"),
    contactName: readString(item, "contactName", "ContactName"),
    phone: readString(item, "phone", "Phone"),
    email: readString(item, "email", "Email"),
    preferredContact: readPreferredContact(item),
    tradeSpecialties: readString(item, "tradeSpecialties", "TradeSpecialties"),
    isActive: readBool(item, "isActive", "IsActive"),
    totalJobs: Number(item.totalJobs ?? item.TotalJobs ?? 0),
  };
}

export function mapRosterTechnicians(raw: unknown): VendorRosterTechnician[] {
  return Array.isArray(raw) ? raw.map(mapRosterTechnician) : [];
}

export function mapVendorCompanyRoster(raw: unknown): VendorCompanyRoster {
  const item = asRecord(raw);
  return {
    companyId: readCompanyId(item),
    rowVersion: readString(item, "rowVersion", "RowVersion"),
    name: readString(item, "name", "Name", "companyName", "CompanyName"),
    companyPhone: readString(item, "companyPhone", "CompanyPhone"),
    email: readString(item, "email", "Email"),
    address: readString(item, "address", "Address"),
    city: readString(item, "city", "City"),
    state: readString(item, "state", "State"),
    zip: readString(item, "zip", "Zip", "zipCode", "ZipCode"),
    googleMapsUrl: readString(item, "googleMapsUrl", "GoogleMapsUrl"),
    notes: readString(item, "notes", "Notes"),
    areaId: readString(item, "areaId", "AreaId"),
    areaName: readString(item, "areaName", "AreaName"),
    technicians: mapRosterTechnicians(item.technicians ?? item.Technicians),
  };
}

/** Form Area ids are strings; the API takes a positive integer id or null (Unassigned). */
export function toBackendAreaId(value: unknown): number | null {
  const parsed = Number(typeof value === "string" ? value.trim() : value);
  return Number.isInteger(parsed) && parsed > 0 ? parsed : null;
}

export function mapRosterTechnicianToBackend(technician: unknown): Record<string, unknown> {
  const item = asRecord(technician);
  const payload: Record<string, unknown> = {
    contactName: readString(item, "contactName", "ContactName"),
    phone: toCanonicalPhone(item.phone ?? item.Phone),
    email: readString(item, "email", "Email"),
    tradeSpecialties: readString(item, "tradeSpecialties", "TradeSpecialties"),
    isActive: readBool(item, "isActive", "IsActive"),
  };
  const preferredContact = readPreferredContact(item);
  if (preferredContact) payload.preferredContact = preferredContact;
  const id = readId(item, "id", "Id");
  if (id !== undefined) payload.id = id;
  return payload;
}

export function mapVendorRosterToBackend(values: unknown): Record<string, unknown> {
  const item = asRecord(values);
  const techniciansRaw = item.technicians ?? item.Technicians;
  const payload: Record<string, unknown> = {
    name: readString(item, "name", "Name", "companyName", "CompanyName"),
    companyPhone: toCanonicalPhone(item.companyPhone ?? item.CompanyPhone),
    email: readString(item, "email", "Email"),
    address: readString(item, "address", "Address"),
    city: readString(item, "city", "City"),
    state: readString(item, "state", "State"),
    zip: readString(item, "zip", "Zip", "zipCode", "ZipCode"),
    // The stored Maps URL is deprecated: reads keep it for legacy records, but
    // roster writes must not carry it back to the backend.
    notes: readString(item, "notes", "Notes"),
    technicians: Array.isArray(techniciansRaw)
      ? techniciansRaw.map(mapRosterTechnicianToBackend)
      : [],
  };
  // The form always round-trips its Area (id or null = Unassigned). Callers
  // without an Area value omit it, which the API treats as "leave unchanged".
  if ("areaId" in item || "AreaId" in item) {
    payload.areaId = toBackendAreaId(item.areaId ?? item.AreaId);
  }
  const rowVersion = readString(item, "rowVersion", "RowVersion");
  if (rowVersion) payload.rowVersion = rowVersion;
  return payload;
}

export interface VendorRosterAdditivePatch {
  rowVersion: string;
  addTechnicians: unknown[];
  companyFields?: Record<string, string>;
}

export function mapVendorRosterAdditivePatchToBackend(
  patch: VendorRosterAdditivePatch,
): Record<string, unknown> {
  const item = asRecord(patch);
  const payload: Record<string, unknown> = {
    rowVersion: readString(item, "rowVersion", "RowVersion"),
    addTechnicians: patch.addTechnicians.map((technician) => {
      const mapped = mapRosterTechnicianToBackend(technician);
      delete mapped.id;
      return mapped;
    }),
  };
  if (patch.companyFields) {
    // SH-250: match the reconcile write path, which canonicalizes companyPhone.
    // Copying companyFields verbatim let additive patches send a different phone
    // shape than PUT for the same user input.
    const companyFields: Record<string, unknown> = { ...patch.companyFields };
    if (companyFields.companyPhone !== undefined)
      companyFields.companyPhone = toCanonicalPhone(companyFields.companyPhone);
    // An edited Area is sent as an id or an explicit null (Unassigned).
    if (companyFields.areaId !== undefined)
      companyFields.areaId = toBackendAreaId(companyFields.areaId);
    payload.companyFields = companyFields;
  }
  return payload;
}

function mapBlockedWorkOrder(raw: unknown): VendorRosterBlockedWorkOrder {
  const item = asRecord(raw);
  return {
    workOrderId: readId(item, "workOrderId", "WorkOrderId", "id", "Id") ?? "",
    workOrderNumber: readString(item, "workOrderNumber", "WorkOrderNumber"),
    workOrderTitle: readString(item, "workOrderTitle", "WorkOrderTitle", "title", "Title"),
    status: readString(item, "status", "Status"),
    scheduledDate: readString(item, "scheduledDate", "ScheduledDate") || undefined,
  };
}

export function mapRosterConflict(raw: unknown, fallbackMessage: string): VendorRosterConflict {
  const item = asRecord(raw);
  const blockedRaw = item.blockedWorkOrders ?? item.BlockedWorkOrders ?? item.openWorkOrders;
  const blockedWorkOrders = Array.isArray(blockedRaw) ? blockedRaw.map(mapBlockedWorkOrder) : [];
  const code = readString(item, "code", "Code");
  const kind: VendorRosterConflictKind =
    code === "duplicate_vendor_company_name"
      ? "duplicate"
      : blockedWorkOrders.length > 0
        ? "open-work-orders"
        : "stale";
  const message = readString(item, "message", "Message") || fallbackMessage;
  return { kind, message, blockedWorkOrders };
}