import type { Hono } from "hono";
import * as XLSX from "xlsx";
import type { AuthUser } from "./auth.ts";
import { tenantScope } from "./auth.ts";
import { requireCoreAuth } from "./scope.ts";
import { requirePermission } from "./permissions.ts";
import { callCoreFn } from "./rpc.ts";
import { respondApiError, respondRpc, routeLabel } from "./http_errors.ts";
import type { Db } from "./db.ts";

type App = Hono<{ Variables: { user: AuthUser; db: Db } }>;

function tid(c: { get: (k: "user") => AuthUser }): number {
  return tenantScope(c.get("user")) ?? 0;
}

function num(v: unknown): number {
  const n = Number(String(v ?? "").replace(/[$,\s]/g, ""));
  return Number.isFinite(n) ? n : 0;
}

function mapInvoiceRow(raw: Record<string, unknown>) {
  const r: Record<string, string> = {};
  for (const [k, v] of Object.entries(raw)) {
    r[k.normalize("NFD").replace(/\p{M}/gu, "").toLowerCase().trim()] = String(v ?? "").trim();
  }
  const pick = (...keys: string[]) => keys.map((k) => r[k]).find((v) => v) ?? "";
  return {
    direction: pick("direccion", "dirección", "tipo") || "recibida",
    rfc: pick("rfc"),
    supplier_name: pick("proveedor", "nombre"),
    uuid: pick("uuid"),
    serie: pick("serie"),
    folio: pick("folio"),
    invoice_date: pick("fecha", "invoice_date"),
    description: pick("descripcion", "descripción", "concepto"),
    quantity: num(pick("cantidad")),
    unit: pick("unidad"),
    amount: num(pick("importe", "subtotal")),
    iva: num(pick("iva")),
    total: num(pick("total")),
    project_code: pick("obra", "clave obra", "proyecto"),
    item_code: pick("clave concepto", "concepto presupuesto", "partida"),
  };
}

export function registerInvoiceRoutes(app: App) {
  app.get("/v1/invoices", ...requireCoreAuth, requirePermission("invoices.view"), async (c) => {
    const db = c.get("db");
    const env = await callCoreFn(db, "core.fn_invoice_list", {
      tenant_id: tid(c),
      direction: c.req.query("direction"),
      supplier_id: c.req.query("supplier_id"),
      rfc: c.req.query("rfc"),
      uuid: c.req.query("uuid"),
      folio: c.req.query("folio"),
      q: c.req.query("q"),
      amount_min: c.req.query("amount_min"),
      amount_max: c.req.query("amount_max"),
      date_from: c.req.query("date_from"),
      date_to: c.req.query("date_to"),
      project_id: c.req.query("project_id"),
      classified: c.req.query("classified"),
    }, { route: routeLabel(c) });
    return respondRpc(c, env);
  });

  app.get("/v1/invoices/:id", ...requireCoreAuth, requirePermission("invoices.view"), async (c) => {
    const db = c.get("db");
    return respondRpc(c, await callCoreFn(db, "core.fn_invoice_get", { id: Number(c.req.param("id")) }, { route: routeLabel(c) }));
  });

  app.post("/v1/invoices/import", ...requireCoreAuth, requirePermission("invoices.create"), async (c) => {
    const body = await c.req.parseBody();
    const companyId = Number(body.company_id);
    const file = body.file;
    if (!(file instanceof File)) {
      return respondApiError(c, "VALIDATION", "Adjunte el Excel de facturas", { route: routeLabel(c) });
    }
    const wb = XLSX.read(new Uint8Array(await file.arrayBuffer()), { type: "array", cellDates: true });
    const sheet = wb.Sheets[wb.SheetNames[0]];
    const raw = XLSX.utils.sheet_to_json<Record<string, unknown>>(sheet, { defval: "", raw: false });
    const rows = raw.map(mapInvoiceRow).map((row) => {
      const date = row.invoice_date;
      const iso = /^\d{4}-\d{2}-\d{2}/.test(date)
        ? date.slice(0, 10)
        : /^\d{2}\/\d{2}\/\d{4}/.test(date)
          ? `${date.slice(6, 10)}-${date.slice(3, 5)}-${date.slice(0, 2)}`
          : date;
      return { ...row, invoice_date: iso };
    });
    const db = c.get("db");
    return respondRpc(c, await callCoreFn(db, "core.fn_invoice_import", {
      tenant_id: tid(c),
      company_id: companyId,
      rows,
    }, { route: routeLabel(c) }));
  });

  app.post("/v1/invoices/:id/classify", ...requireCoreAuth, requirePermission("invoices.update"), async (c) => {
    const body = await c.req.json<Record<string, unknown>>();
    const db = c.get("db");
    return respondRpc(c, await callCoreFn(db, "core.fn_invoice_classify", {
      ...body,
      id: Number(c.req.param("id")),
      tenant_id: tid(c),
    }, { route: routeLabel(c) }));
  });
}