import { createContext, DomainError } from "@tailor-platform/erp-kit/app";
import { createResolver, t } from "@tailor-platform/sdk";
import { getDB } from "@/generated/kysely-tailordb";
import { apModulesExport } from "@/modules";

export default createResolver({
  name: "createAccountPayableDocument",
  operation: "mutation",
  input: {
    header: t
      .object({
        companyId: t.string().description("Company the invoice belongs to"),
        supplierAccountId: t.string().description("Supplier account the invoice is owed to"),
        currencyId: t.string().description("Transaction currency"),
        payableControlAccountId: t.string().description("GL payable control account (LIABILITY)"),
        documentType: t.string().description("INVOICE or CREDIT_MEMO"),
        externalDocumentNumber: t
          .string({ optional: true })
          .description("Supplier's own invoice number"),
        description: t.string({ optional: true }).description("Invoice description"),
        documentDate: t.date().description("Invoice document date"),
        postingDate: t.date().description("GL posting date"),
        totalAmount: t.string().description("Document total (decimal string)"),
      })
      .description("Invoice header"),
    lines: t
      .object(
        {
          netAmount: t.string().description("Line net amount (decimal string)"),
          grossAmount: t.string().description("Line gross amount (decimal string)"),
          taxAmount: t.string({ optional: true }).description("Line tax amount (decimal string)"),
          description: t.string({ optional: true }).description("Line description"),
          sourceType: t
            .string({ optional: true })
            .description("PURCHASE_ORDER for PO-sourced lines"),
          purchaseOrderLineId: t
            .string({ optional: true })
            .description("Backing purchase order line (PO-sourced)"),
          quantity: t.string({ optional: true }).description("Ordered quantity (PO-sourced)"),
          unitPrice: t.string({ optional: true }).description("Ordered unit price (PO-sourced)"),
          unitId: t.string({ optional: true }).description("Unit of measure (PO-sourced)"),
          distributions: t
            .object(
              {
                accountId: t.string().description("GL account the amount is booked to"),
                amount: t.string().description("Distribution amount (decimal string)"),
                description: t.string({ optional: true }).description("Distribution description"),
              },
              { array: true },
            )
            .description(
              "Line distributions (empty for PO-sourced lines; the command derives them)",
            ),
        },
        { array: true },
      )
      .description("Invoice lines"),
    dueSchedule: t
      .object(
        {
          dueDate: t.date().description("Installment due date"),
          amount: t.string().description("Installment amount (decimal string)"),
        },
        { array: true, optional: true },
      )
      .description("Payment due schedule"),
  },
  body: async (context) => {
    const ctx = createContext(context);
    const db = getDB("main-db");
    const { header, lines, dueSchedule } = context.input;
    return db
      .transaction()
      .execute(async (trx) => {
        const result = await apModulesExport.commands.createAccountPayableDocument(
          trx,
          {
            header: {
              companyId: header.companyId,
              supplierAccountId: header.supplierAccountId,
              currencyId: header.currencyId,
              payableControlAccountId: header.payableControlAccountId,
              documentType: header.documentType as "INVOICE" | "CREDIT_MEMO",
              externalDocumentNumber: header.externalDocumentNumber ?? undefined,
              description: header.description ?? undefined,
              documentDate: new Date(header.documentDate),
              postingDate: new Date(header.postingDate),
              totalAmount: header.totalAmount,
            },
            lines: lines.map((line) => ({
              netAmount: line.netAmount,
              grossAmount: line.grossAmount,
              taxAmount: line.taxAmount ?? undefined,
              description: line.description ?? undefined,
              sourceType: (line.sourceType ?? undefined) as "PURCHASE_ORDER" | undefined,
              purchaseOrderLineId: line.purchaseOrderLineId ?? undefined,
              quantity: line.quantity ?? undefined,
              unitPrice: line.unitPrice ?? undefined,
              unitId: line.unitId ?? undefined,
              distributions: line.distributions.map((distribution) => ({
                accountId: distribution.accountId,
                amount: distribution.amount,
                description: distribution.description ?? undefined,
              })),
            })),
            dueSchedule: dueSchedule?.map((installment) => ({
              dueDate: new Date(installment.dueDate),
              amount: installment.amount,
            })),
          },
          ctx,
        );

        if (!result.ok) {
          switch (result.error.code) {
            case "ACCOUNT_PAYABLE_COMPANY_NOT_FOUND":
              throw new DomainError(`Company not found: ${header.companyId}`);
            case "ACCOUNT_PAYABLE_AP_SUPPLIER_ACCOUNT_NOT_FOUND":
              throw new DomainError(`Supplier account not found: ${header.supplierAccountId}`);
            case "ACCOUNT_PAYABLE_AP_INVALID_SUPPLIER_ACCOUNT":
              throw new DomainError(
                "The supplier account is not valid for this company or is inactive.",
              );
            case "ACCOUNT_PAYABLE_AP_CURRENCY_NOT_FOUND":
              throw new DomainError(`Currency not found: ${header.currencyId}`);
            case "ACCOUNT_PAYABLE_ACCOUNT_NOT_FOUND":
              throw new DomainError("A referenced GL account does not exist.");
            case "ACCOUNT_PAYABLE_ACCOUNT_INACTIVE":
              throw new DomainError("A referenced GL account is not ACTIVE.");
            case "ACCOUNT_PAYABLE_AP_INVALID_AMOUNT":
              throw new DomainError(`Invalid amount: ${result.error.message}`);
            case "ACCOUNT_PAYABLE_AP_LINE_TOTAL_MISMATCH":
              throw new DomainError(
                `Line/distribution totals do not reconcile: ${result.error.message}`,
              );
            case "ACCOUNT_PAYABLE_AP_LINE_AMOUNT_MISMATCH":
              throw new DomainError("A line net amount does not equal quantity times unit price.");
            case "ACCOUNT_PAYABLE_AP_LINE_SOURCE_INCONSISTENT":
              throw new DomainError("Line source fields are inconsistent.");
            case "ACCOUNT_PAYABLE_AP_DUE_SCHEDULE_INVALID":
              throw new DomainError("The due schedule is invalid or does not reconcile.");
            case "ACCOUNT_PAYABLE_AP_MINIMUM_LINES_NOT_MET":
              throw new DomainError(
                "The invoice must have at least one line with one distribution.",
              );
            case "ACCOUNT_PAYABLE_AP_ACCRUAL_ACCOUNT_UNRESOLVED":
              throw new DomainError(
                "Could not resolve an accrual account for a purchase-order sourced line.",
              );
            case "ACCOUNT_PAYABLE_AP_DOCUMENT_LINE_NOT_FOUND":
              throw new DomainError("A referenced document line does not exist.");
            case "ACCOUNT_PAYABLE_AP_PURCHASE_ORDER_ACCOUNT_MISMATCH":
              throw new DomainError(
                "The invoice and purchase order must belong to the same company and supplier account.",
              );
            case "UNAUTHENTICATED":
              throw new DomainError("Authentication is required");
            case "INSUFFICIENT_PERMISSION":
              throw new DomainError("You do not have permission to perform this action");
            default:
              throw result.error satisfies never;
          }
        }

        return {
          id: result.value.accountPayableDocument.id,
          status: result.value.accountPayableDocument.status,
        };
      })
      .catch((err: unknown) => {
        if (err instanceof DomainError) throw err;
        throw new Error("Failed to create the account payable invoice", { cause: err });
      });
  },
  output: t
    .object({
      id: t.string().description("Account payable document ID"),
      status: t.string().description("Document status (DRAFT)"),
    })
    .description("CreateAccountPayableDocument response"),
});