import { ReportCategory } from "@/types/sales";

const API_BASE = (import.meta.env.VITE_POS_API_BASE_URL || "/api").replace(
  /\/$/,
  "",
);

export interface QuickButtonConfig {
  id: string;
  label: string;
  shortLabel: string;
  taxable: boolean;
  taxRate?: number;
  reportCategory: ReportCategory;
}

export interface PosSettings {
  groceryTaxRate: number;
  quickButtons: QuickButtonConfig[];
}

export const defaultQuickButtons: QuickButtonConfig[] = [
  {
    id: "unleaded",
    label: "Unleaded",
    shortLabel: "GAS",
    taxable: true,
    reportCategory: "Unleaded",
  },
  {
    id: "unleaded-plus",
    label: "Unleaded Plus",
    shortLabel: "GAS+",
    taxable: true,
    reportCategory: "Unleaded Plus",
  },
  {
    id: "diesel",
    label: "Diesel",
    shortLabel: "DSL",
    taxable: true,
    reportCategory: "Diesel",
  },
  {
    id: "off-road-diesel",
    label: "Off Road Diesel",
    shortLabel: "ORD",
    taxable: false,
    reportCategory: "Off Road Diesel",
  },
  {
    id: "hardware",
    label: "Hardware",
    shortLabel: "HDW",
    taxable: true,
    reportCategory: "Hardware",
  },
  {
    id: "oil",
    label: "Oil",
    shortLabel: "OIL",
    taxable: true,
    reportCategory: "Oil",
  },
];

export const defaultPosSettings: PosSettings = {
  groceryTaxRate: 2,
  quickButtons: defaultQuickButtons,
};

const reportCategoryOptions: ReportCategory[] = [
  "Taxable",
  "Non-Taxable",
  "Unleaded",
  "Unleaded Plus",
  "Diesel",
  "Off Road Diesel",
  "Oil",
  "Hardware",
  "Other",
];

export const reportBuckets = reportCategoryOptions;

function normalizeQuickButton(
  button: Partial<QuickButtonConfig>,
  index: number,
  fallback: QuickButtonConfig,
): QuickButtonConfig {
  return {
    id: button.id || fallback.id || `button-${index}`,
    label: button.label || fallback.label || "Item",
    shortLabel: button.shortLabel || fallback.shortLabel || "BTN",
    taxable: Boolean(button.taxable),
    taxRate:
      typeof button.taxRate === "number" && !Number.isNaN(button.taxRate)
        ? button.taxRate
        : fallback.taxRate,
    reportCategory: reportCategoryOptions.includes(
      button.reportCategory as ReportCategory,
    )
      ? (button.reportCategory as ReportCategory)
      : fallback.reportCategory,
  };
}

export function normalizePosSettings(
  value: Partial<PosSettings> | null | undefined,
): PosSettings {
  const quickButtonsSource =
    value?.quickButtons && value.quickButtons.length > 0
      ? value.quickButtons
      : defaultQuickButtons;

  return {
    groceryTaxRate:
      typeof value?.groceryTaxRate === "number" &&
      !Number.isNaN(value.groceryTaxRate)
        ? value.groceryTaxRate
        : defaultPosSettings.groceryTaxRate,
    quickButtons: quickButtonsSource.map((button, index) =>
      normalizeQuickButton(
        button,
        index,
        defaultQuickButtons[index] ||
          defaultQuickButtons[defaultQuickButtons.length - 1],
      ),
    ),
  };
}

export async function loadPosSettings(): Promise<PosSettings | null> {
  try {
    const response = await fetch(`${API_BASE}/settings.php`);
    if (!response.ok) return null;

    const data = (await response.json()) as Partial<PosSettings>;
    return normalizePosSettings(data);
  } catch (error) {
    console.error("Failed to load POS settings", error);
    return null;
  }
}

export async function savePosSettings(settings: PosSettings): Promise<boolean> {
  try {
    const response = await fetch(`${API_BASE}/settings.php`, {
      method: "POST",
      headers: {
        "Content-Type": "application/json",
      },
      body: JSON.stringify(settings),
    });

    return response.ok;
  } catch (error) {
    console.error("Failed to save POS settings", error);
    return false;
  }
}