import type { CompletionDocFilter } from "@/domain/work-orders/types/work-order-advanced-filters";
import type { WorkOrderAdvancedFilters } from "@/domain/work-orders/types/work-order-advanced-filters";
import { EMPTY_ADVANCED_FILTERS } from "@/domain/work-orders/types/work-order-advanced-filters";
import { ALL_WIZARD_STATUSES, WO_TYPES } from "@/domain/work-orders/types/work-order-wizard";
import type { WizardWOStatus, WOType } from "@/domain/work-orders/types/work-order-wizard";
import type { UpliftFilterStatus } from "@/domain/work-orders/types/work-order-uplift-filter";
import { cloneAdvancedFilters } from "@/domain/work-orders/utils/advanced-filters-utils";
import { parseWorkOrderIdsParam } from "@/domain/work-orders/utils/work-order-ids-filter";

const ISO_DATE_PATTERN = /^\d{4}-\d{2}-\d{2}$/;

const COMPLETION_DOC_FILTERS: CompletionDocFilter[] = ["No", "Yes", "NN"];

// SH-348: the board region filter (backend#146) accepts these region names.
const BOARD_REGION_NAMES = ["East", "Central", "West", "California", "Unmapped/Other"];

const UPLIFT_FILTER_VALUES: UpliftFilterStatus[] = [
  "pending",
  "approved",
  "auto_approved",
  "rejected",
];

function parseList(raw: string | null): string[] {
  if (!raw) {
    return [];
  }

  return raw
    .split(",")
    .map((item) => item.trim())
    .filter((item) => item !== "");
}

function parseStatuses(raw: string | null): WizardWOStatus[] {
  const valid = new Set<string>(ALL_WIZARD_STATUSES);
  return [...new Set(parseList(raw))].filter((status): status is WizardWOStatus =>
    valid.has(status),
  );
}

function parseTypes(raw: string | null): WOType[] {
  const valid = new Set<string>(WO_TYPES);
  return [...new Set(parseList(raw))].filter((type): type is WOType => valid.has(type));
}

function parseCompletionDocs(raw: string | null): CompletionDocFilter[] {
  const valid = new Set<string>(COMPLETION_DOC_FILTERS);
  return [...new Set(parseList(raw))].filter((doc): doc is CompletionDocFilter => valid.has(doc));
}

function parseRegions(raw: string | null): string[] {
  const valid = new Set<string>(BOARD_REGION_NAMES);
  return [...new Set(parseList(raw))].filter((region) => valid.has(region));
}

function parseUpliftStatuses(raw: string | null): UpliftFilterStatus[] {
  const valid = new Set<string>(UPLIFT_FILTER_VALUES);
  return [...new Set(parseList(raw))].filter((value): value is UpliftFilterStatus =>
    valid.has(value),
  );
}

export function parseDashboardDrilldownParams(
  params: URLSearchParams,
): WorkOrderAdvancedFilters | null {
  // An exact id set replaces every other filter: nothing else may hide one of those work orders.
  const workOrderIds = parseWorkOrderIdsParam(params.get("ids"));
  if (workOrderIds.length > 0) {
    return { ...cloneAdvancedFilters(EMPTY_ADVANCED_FILTERS), workOrderIds: new Set(workOrderIds) };
  }

  const dateFrom = (params.get("dateFrom") ?? "").trim();
  const dateTo = (params.get("dateTo") ?? "").trim();
  const hasDateRange = ISO_DATE_PATTERN.test(dateFrom) && ISO_DATE_PATTERN.test(dateTo);
  const avetaOnly = params.get("aveta") === "1";
  const docs = parseCompletionDocs(params.get("docs"));
  const statuses = parseStatuses(params.get("statuses"));
  const types = parseTypes(params.get("types"));
  const dispatchers = parseList(params.get("dispatchers"));
  const regions = parseRegions(params.get("regions"));
  const upliftStatuses = parseUpliftStatuses(params.get("upliftStatuses"));
  const hasUplift = params.get("hasUplift") === "1";

  const hasAny = [
    hasDateRange,
    avetaOnly,
    docs.length,
    statuses.length,
    types.length,
    dispatchers.length,
    regions.length,
    upliftStatuses.length,
    hasUplift,
  ].some(Boolean);

  if (!hasAny) {
    return null;
  }

  const filters = cloneAdvancedFilters(EMPTY_ADVANCED_FILTERS);

  if (hasDateRange) {
    filters.dateRange = "custom";
    filters.customFrom = dateFrom;
    filters.customTo = dateTo;
  }
  filters.avetaOnly = avetaOnly;
  filters.hasUplift = hasUplift || upliftStatuses.length > 0;
  if (docs.length > 0) {
    filters.docs = new Set(docs);
  }
  if (statuses.length > 0) {
    filters.statuses = new Set(statuses);
  }
  if (types.length > 0) {
    filters.types = new Set(types);
  }
  if (dispatchers.length > 0) {
    filters.dispatchers = new Set(dispatchers);
  }
  if (regions.length > 0) {
    filters.regions = new Set(regions);
  }
  if (upliftStatuses.length > 0) {
    filters.upliftStatuses = new Set(upliftStatuses);
  }

  return filters;
}