import { error, fail, redirect } from "@sveltejs/kit";
import type { Actions, PageServerLoad } from "./$types";
import type { StackqReceipt } from "$lib/types/receipts";
import type { ReceiptDataShape } from "$lib/types/receipts";
import { convertHeicFileToJpegIfNeeded } from "$lib/convert-heic-server";
import { parseNumWithDefault } from "$lib/parse-form";
import { validateImageUpload } from "$lib/validate-image-upload";

const COLLECTION = "Stackq_Receipts";

const STATUS_OPTIONS = ["New", "Data Entered", "Reviewed", "Consolidated"] as const;
const TYPE_OPTIONS = ["Purchase", "Gas"] as const;
const MAX_LINE_ITEMS = 500;

export const load: PageServerLoad = async ({ params, locals }) => {
  const { id } = params;
  try {
    const record = await locals.pb
      .collection(COLLECTION)
      .getOne<StackqReceipt>(id, { expand: "User" });
    return { receipt: record };
  } catch (err: unknown) {
    const is404 =
      err &&
      typeof err === "object" &&
      "status" in err &&
      (err as { status: number }).status === 404;
    if (is404) throw error(404, "Receipt not found");
    throw err;
  }
};

export const actions: Actions = {
  update: async ({ request, locals, params }) => {
    const id = params.id;
    if (!id) return fail(400, { error: "Missing id", form: "update" });

    const form = await request.formData();
    const Status = (form.get("Status") as string)?.trim() || "New";
    const Type = (form.get("Type") as string)?.trim() || "Purchase";
    const dataJson = (form.get("dataJson") as string)?.trim() ?? "{}";
    const imageFile = form.get("Image") as File | null;
    const hasImage = imageFile && imageFile.size > 0;
    if (hasImage) {
      const imgError = validateImageUpload(imageFile);
      if (imgError) return fail(400, { error: imgError, form: "update" });
    }

    let imageToSave: File | null = hasImage ? imageFile : null;
    if (imageToSave) {
      try {
        imageToSave = await convertHeicFileToJpegIfNeeded(imageToSave);
      } catch {
        return fail(400, {
          error: "Could not convert HEIC image. Try saving as JPEG (iPhone: Settings → Camera → Formats) or use a different photo.",
          form: "update",
        });
      }
    }

    let Data: ReceiptDataShape = {};
    try {
      const parsed = JSON.parse(dataJson) as unknown;
      if (parsed && typeof parsed === "object" && !Array.isArray(parsed)) {
        const o = parsed as Record<string, unknown>;
        if (Array.isArray(o.lineItems)) {
          const filtered = o.lineItems.filter(
            (row: unknown): row is { item: string; description: string; quantity: number; price: number } =>
              row != null &&
              typeof row === "object" &&
              "item" in row &&
              "quantity" in row &&
              "price" in row
          );
          Data.lineItems = filtered.slice(0, MAX_LINE_ITEMS).map((row) => ({
            item: String(row.item ?? ""),
            description: String(row.description ?? ""),
            quantity: parseNumWithDefault(row.quantity, 0),
            price: parseNumWithDefault(row.price, 0),
          }));
        }
        if (typeof o.tax === "number" && Number.isFinite(o.tax)) Data.tax = o.tax;
        else if (typeof o.tax === "string") Data.tax = parseNumWithDefault(o.tax, 0);
        if (typeof o.receiptTotal === "number" && Number.isFinite(o.receiptTotal)) {
          Data.receiptTotal = o.receiptTotal;
        } else if (typeof o.receiptTotal === "string") {
          Data.receiptTotal = parseNumWithDefault(o.receiptTotal, 0);
        }
      }
    } catch {
      return fail(400, { error: "Invalid receipt data JSON", form: "update" });
    }

    const body: Record<string, unknown> = {
      Status: STATUS_OPTIONS.includes(Status as (typeof STATUS_OPTIONS)[number]) ? Status : "New",
      Type: TYPE_OPTIONS.includes(Type as (typeof TYPE_OPTIONS)[number]) ? Type : "Purchase",
      Data: Object.keys(Data).length ? Data : undefined,
    };
    if (imageToSave) body.Image = imageToSave;

    try {
      await locals.pb.collection(COLLECTION).update(id, body);
    } catch (e: unknown) {
      const message =
        e && typeof e === "object" && "message" in e
          ? String((e as { message: string }).message)
          : "Update failed";
      return fail(500, { error: message, form: "update" });
    }
    return { success: true };
  },

  delete: async ({ locals, params }) => {
    const id = params.id;
    if (!id) return fail(400, { error: "Missing id", form: "delete" });
    try {
      await locals.pb.collection(COLLECTION).delete(id);
    } catch (e: unknown) {
      const message =
        e && typeof e === "object" && "message" in e
          ? String((e as { message: string }).message)
          : "Delete failed";
      return fail(500, { error: message, form: "delete" });
    }
    throw redirect(303, "/receipts");
  },
};