import { useEffect, useMemo, useState } from "react";
import { useQueryClient } from "@tanstack/react-query";
import { toast } from "react-toastify";
import { showCompDocDraftSavedToast } from "@/app/(protected)/workorders/_components/comp-doc/comp-doc-draft-toast";
import { locationsApi } from "@/domain/locations/api/locations-api";
import type { Location } from "@/domain/locations/types/location";
import { useLocationDetail } from "@/domain/locations/use-cases/use-location-detail";
import type {
  CompDocData,
  CompDocSaveStatus,
  DocFields,
  DocState,
} from "@/domain/work-orders/types/completion-doc";
import type { WorkOrderTableRow } from "@/domain/work-orders/types/work-order-table-row";
import { getMockWoWizardLocationDetail } from "@/domain/work-orders/mocks/wo-wizard-mock-data";
import { buildDocHtml, printDoc } from "@/domain/work-orders/utils/completion-doc-html";
import { resolveCompDocSite } from "@/domain/work-orders/utils/completion-doc-site";
import {
  DOC_STATE_CFG,
  docStateOf,
  fmtDocNow,
} from "@/domain/work-orders/utils/completion-doc-state";
import { queryKeys } from "@/infra/query-key/query-key";

type UseCompDocDialogParams = {
  row: WorkOrderTableRow;
  open: boolean;
  data?: CompDocData;
  onSave: (data: CompDocData, status: CompDocSaveStatus) => void | Promise<void>;
  onDateCompletedChange?: (date: string) => void | Promise<void>;
};

function buildAddressLine(site: { street: string; fullAddress: string }): string {
  if (site.street.trim()) return site.street.trim();
  return site.fullAddress !== "—" ? site.fullAddress : "";
}

function locationUpdatePayload(location: Location, address: string): Location {
  return {
    ...location,
    address,
  };
}

export function useCompDocDialog({
  row,
  open,
  data,
  onSave,
  onDateCompletedChange,
}: UseCompDocDialogParams) {
  const queryClient = useQueryClient();
  const locId = String(row.locationId || "");
  const isMockLocation = locId.startsWith("mock-");
  const { data: apiLocationDetail } = useLocationDetail(
    isMockLocation || !locId ? undefined : locId,
  );
  const locationDetail = isMockLocation ? getMockWoWizardLocationDetail(locId) : apiLocationDetail;
  const site = useMemo(() => resolveCompDocSite(row, locationDetail), [row, locationDetail]);

  const [notes, setNotes] = useState("");
  const [docState, setDocState] = useState<DocState>("draft");
  const [generatedAt, setGeneratedAt] = useState("");
  const [editDateCompleted, setEditDateCompleted] = useState("");
  const [editAddress, setEditAddress] = useState("");

  useEffect(() => {
    if (!open) return;
    setNotes(data?.notes ?? "");
    setDocState(docStateOf(row.docStatus));
    setGeneratedAt(data?.generatedAt ?? "");
    setEditDateCompleted(row.completedDate || "");
    setEditAddress(buildAddressLine(resolveCompDocSite(row, locationDetail)));
  }, [open, row, data?.notes, data?.generatedAt, locationDetail]);

  const amazonRep = row.pocName || "";
  const seaRep = row.tech || "";
  const cfg = DOC_STATE_CFG[docState];
  const isNotRequired = docState === "not-required";
  const isGenerated = docState === "generated";

  const effectiveStreet = editAddress.trim() || site.street;
  const docFields: DocFields = {
    street: effectiveStreet,
    city: site.city,
    state: site.state,
    zip: site.zip,
    dateCompleted: editDateCompleted,
    amazonRep,
    seaRep,
  };

  const previewSite = useMemo(
    () => ({
      ...site,
      street: effectiveStreet,
      fullAddress:
        [effectiveStreet, site.label, site.zip].filter(Boolean).join(", ") ||
        effectiveStreet ||
        "—",
    }),
    [site, effectiveStreet],
  );

  async function persist(extra: Partial<CompDocData>, status: CompDocSaveStatus): Promise<void> {
    await onSave({ notes, generatedAt, ...extra }, status);
  }

  async function syncCompletedDateIfChanged(): Promise<void> {
    if (editDateCompleted !== (row.completedDate || "")) {
      await onDateCompletedChange?.(editDateCompleted);
    }
  }

  async function syncAddressIfChanged(): Promise<void> {
    const next = editAddress.trim();
    const current = buildAddressLine(site);
    if (next === current) return;
    if (isMockLocation || !locId) return;
    if (!locationDetail) {
      throw new Error("Location details are still loading. Try saving again.");
    }

    await locationsApi.update(locId, locationUpdatePayload(locationDetail, next));
    void queryClient.invalidateQueries({ queryKey: queryKeys.locations.detail(locId) });
    void queryClient.invalidateQueries({ queryKey: queryKeys.locations.all });
    void queryClient.invalidateQueries({ queryKey: queryKeys.workOrders.all });
  }

  function handleMarkNotRequired() {
    setDocState("not-required");
    void persist({}, "NN");
  }

  function handleUndo() {
    setDocState("draft");
    void persist({}, "No");
  }

  async function handleSaveDraft() {
    try {
      await persist({}, "No");
      await syncCompletedDateIfChanged();
      await syncAddressIfChanged();
      showCompDocDraftSavedToast();
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "Failed to save draft");
    }
  }

  async function handleGenerate() {
    const ts = fmtDocNow();
    try {
      await persist({ generatedAt: ts }, "Yes");
      await syncCompletedDateIfChanged();
      await syncAddressIfChanged();
      setGeneratedAt(ts);
      setDocState("generated");
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "Failed to generate document");
    }
  }

  function handleDownloadPdf() {
    printDoc(buildDocHtml(row, { notes, generatedAt }, docFields));
  }

  return {
    site: previewSite,
    notes,
    setNotes,
    docState,
    generatedAt,
    editAddress,
    setEditAddress,
    editDateCompleted,
    setEditDateCompleted,
    amazonRep,
    seaRep,
    cfg,
    isNotRequired,
    isGenerated,
    handleMarkNotRequired,
    handleUndo,
    handleSaveDraft,
    handleGenerate,
    handleDownloadPdf,
  };
}