import { describe, it, expect } from "vitest";
import {
  PURCHASE_INTENT_RE,
  detectPurchaseIntent,
  extractPaymentPreference,
  extractPurchaseUsername,
  purchaseMenuText,
  marketplaceGuidanceText,
  adminContactText,
  buildAdminPurchaseLink,
  purchaseMenuKeyboard,
  marketplaceGuidanceKeyboard,
  adminContactKeyboard,
} from "../src/channels/telegram/commands/purchase.js";

const PLATFORM_NOIS = ["Shopee", "Lazada", "Add-On", "Touch 'n Go", "TnG", "bank-in", "bank transfer 链接"];

describe("第2批 — 购买意图检测（确定性规则，不靠 LLM）", () => {
  it("matches zh purchase phrases", () => {
    expect(detectPurchaseIntent("我要买 CZH01")).toBe(true);
    expect(detectPurchaseIntent("我想买这个产品")).toBe(true);
    expect(detectPurchaseIntent("怎么买？")).toBe(true);
    expect(detectPurchaseIntent("如何购买")).toBe(true);
    expect(detectPurchaseIntent("我想下单")).toBe(true);
    expect(detectPurchaseIntent("怎么付款")).toBe(true);
  });

  it("matches en purchase phrases, but not 'in order to'", () => {
    expect(detectPurchaseIntent("how to buy")).toBe(true);
    expect(detectPurchaseIntent("I want to buy a product")).toBe(true);
    expect(detectPurchaseIntent("buy")).toBe(true);
    expect(detectPurchaseIntent("buyer")).toBe(false);
    expect(detectPurchaseIntent("how do I pay?")).toBe(true);
    expect(detectPurchaseIntent("want to order CZH01")).toBe(true);
    expect(detectPurchaseIntent("In order to access the portal")).toBe(false);
  });

  it("matches ms purchase phrases", () => {
    expect(detectPurchaseIntent("saya nak beli produk")).toBe(true);
    expect(detectPurchaseIntent("macam mana nak bayar")).toBe(true);
    expect(detectPurchaseIntent("saya ingin beli CZH01")).toBe(true);
    expect(detectPurchaseIntent("boleh tempah tak?")).toBe(true);
  });

  it("does not match ordinary chat / price questions / free-trial talk", () => {
    expect(detectPurchaseIntent("这个产品多少钱")).toBe(false);
    expect(detectPurchaseIntent("CZH01 价格是多少")).toBe(false);
    expect(detectPurchaseIntent("how much is it")).toBe(false);
    expect(detectPurchaseIntent("你好")).toBe(false);
    expect(detectPurchaseIntent("谢谢")).toBe(false);
    expect(detectPurchaseIntent("免费版有吗")).toBe(false);
    expect(detectPurchaseIntent("")).toBe(false);
  });
});

describe("第2批 — 付款偏好提取（只认支付方式，不认平台名）", () => {
  it("extracts bank / ewallet / cod preferences in zh/en/ms", () => {
    expect(extractPaymentPreference("我想用银行转账")).toBe("bank");
    expect(extractPaymentPreference("bank transfer ok?")).toBe("bank");
    expect(extractPaymentPreference("boleh bank in?")).toBe("bank");
    expect(extractPaymentPreference("可以用 touch n go 吗")).toBe("ewallet");
    expect(extractPaymentPreference("tng boleh?")).toBe("ewallet");
    expect(extractPaymentPreference("ewallet payment")).toBe("ewallet");
    expect(extractPaymentPreference("cash on delivery")).toBe("cod");
    expect(extractPaymentPreference("货到付款可以")).toBe("cod");
  });

  it("returns undefined when no payment preference is stated", () => {
    expect(extractPaymentPreference("我要买 CZH01")).toBeUndefined();
    expect(extractPaymentPreference("介绍下这个产品")).toBeUndefined();
    expect(extractPaymentPreference("")).toBeUndefined();
  });
});

describe("第2批 — 账号名提取（只认 label，防裸 SKU 误当账号）", () => {
  it("extracts username only when labelled", () => {
    expect(extractPurchaseUsername("我要买 CZH01 账号 username:abc123")).toBe("abc123");
    expect(extractPurchaseUsername("buy CZH01 username:abc123")).toBe("abc123");
    expect(extractPurchaseUsername("我要买 CZH01")).toBeUndefined(); // 裸 SKU 不算
    expect(extractPurchaseUsername("CZH01")).toBeUndefined();
    expect(extractPurchaseUsername("")).toBeUndefined();
  });
});

describe("第2批 — admin 深链构建（第1批防嵌套契约延续）", () => {
  it("SKU only, per language", () => {
    const zh = buildAdminPurchaseLink({ sku: "CZH01", lang: "zh" });
    expect(zh.startsWith("https://t.me/MrFullStackDev?text=")).toBe(true);
    expect(decodeURIComponent(zh.split("text=")[1])).toBe("我要买 CZH01");

    const en = buildAdminPurchaseLink({ sku: "CZH01", lang: "en" });
    expect(decodeURIComponent(en.split("text=")[1])).toBe("I want to buy CZH01");

    const ms = buildAdminPurchaseLink({ sku: "CZH01", lang: "ms" });
    expect(ms).not.toContain("text= "); // 无空格前缀
    expect(ms).toContain("text=");
    expect(decodeURIComponent(ms.split("text=")[1])).toBe("Saya nak beli CZH01");
  });

  it("no SKU → generic product message per language", () => {
    expect(decodeURIComponent(buildAdminPurchaseLink({ lang: "zh" }).split("text=")[1])).toBe(
      "我想购买产品",
    );
    expect(decodeURIComponent(buildAdminPurchaseLink({ lang: "en" }).split("text=")[1])).toBe(
      "I want to buy a product",
    );
    expect(decodeURIComponent(buildAdminPurchaseLink({ lang: "ms" }).split("text=")[1])).toBe(
      "Saya nak beli produk",
    );
  });

  it("SKU + payment preference + username all appended in one sentence", () => {
    const zh = buildAdminPurchaseLink({
      sku: "CZH01",
      paymentPreference: "bank",
      username: "love1r",
      lang: "zh",
    });
    const msg = decodeURIComponent(zh.split("text=")[1]);
    expect(msg).toBe("我要买 CZH01 （想用银行转账） 账号 username:love1r");

    const en = buildAdminPurchaseLink({
      sku: "CZH01",
      paymentPreference: "ewallet",
      username: "love1r",
      lang: "en",
    });
    const enMsg = decodeURIComponent(en.split("text=")[1]);
    expect(enMsg).toBe("I want to buy CZH01 (prefers e-wallet) account username:love1r");
  });

  it("deep-link text never contains another URL (anti double-nesting)", () => {
    for (const link of [
      buildAdminPurchaseLink({ sku: "CZH01", lang: "zh" }),
      buildAdminPurchaseLink({ sku: "CZH01", paymentPreference: "bank", lang: "en" }),
      buildAdminPurchaseLink({ lang: "ms" }),
    ]) {
      expect(link.split("text=")[1]).not.toContain("t.me/");
      expect(link.split("text=")[1]).not.toContain("MrFullStackDev");
      expect(link.split("text=")[1]).not.toContain("%2F"); // 无斜杠 → 无 URL
    }
  });
});

describe("第2批 — 文案中性词纪律（不出现未上线平台/支付名）", () => {
  it("menu, guidance and admin-contact texts never mention platforms by name", () => {
    for (const lang of ["zh", "en", "ms"] as const) {
      for (const text of [
        purchaseMenuText(lang),
        marketplaceGuidanceText(lang),
        adminContactText("https://t.me/MrFullStackDev?text=x", lang),
      ]) {
        for (const noise of PLATFORM_NOIS) {
          expect(text).not.toContain(noise);
        }
      }
    }
  });

  it("menu is single-language and mentions the online store first (priority order)", () => {
    const zh = purchaseMenuText("zh");
    expect(zh.indexOf("网店下单")).toBeGreaterThan(-1);
    expect(zh.indexOf("网店下单")).toBeLessThan(zh.indexOf("直接付款"));
    expect(zh).not.toContain("our online store");
    const en = purchaseMenuText("en");
    expect(en.indexOf("online store")).toBeGreaterThan(-1);
    expect(en.indexOf("online store")).toBeLessThan(en.indexOf("buy here directly"));
    expect(en).not.toContain("网店");
    const ms = purchaseMenuText("ms");
    expect(ms.indexOf("kedai dalam talian")).toBeGreaterThan(-1);
    expect(ms.indexOf("kedai dalam talian")).toBeLessThan(ms.indexOf("beli terus"));
  });

  it("marketplace guidance offers seller/come-back + admin handoff", () => {
    const zh = marketplaceGuidanceText("zh");
    expect(zh).toContain("网店");
    expect(zh).toContain("联系卖家");
    expect(zh).toContain("admin");
  });

  it("admin contact text embeds the deep link standalone (URL gluing rule)", () => {
    const link = "https://t.me/MrFullStackDev?text=hello";
    const zh = adminContactText(link, "zh");
    const lines = zh.split("\n");
    expect(lines).toContain(link);
    const idx = lines.indexOf(link);
    // URL 独占一行：前后都是空行
    expect(lines[idx - 1]).toBe("");
    expect(lines[idx + 1]).toBe("");
  });
});

describe("第2批 — 按钮键盘（两行平铺，callback_data 契约）", () => {
  it("menu keyboard: marketplace on top row, admin below", () => {
    const kb = purchaseMenuKeyboard("zh");
    const rows = kb.inline_keyboard as {
      text: string | undefined;
      callback_data: string;
    }[][];
    expect(rows.length).toBe(2);
    expect(rows[0][0].callback_data).toBe("buy:marketplace");
    expect(rows[1][0].callback_data).toBe("buy:admin");
  });

  it("guidance keyboard: contact admin + back", () => {
    const kb = marketplaceGuidanceKeyboard("zh");
    const rows = kb.inline_keyboard as {
      text: string | undefined;
      callback_data: string;
    }[][];
    expect(rows.length).toBe(2);
    expect(rows[0][0].callback_data).toBe("buy:contact");
    expect(rows[1][0].callback_data).toBe("buy:back");
  });

  it("admin keyboard: back only", () => {
    const kb = adminContactKeyboard("zh");
    const rows = kb.inline_keyboard as {
      text: string | undefined;
      callback_data: string;
    }[][];
    expect(rows.length).toBe(1);
    expect(rows[0][0].callback_data).toBe("buy:back");
  });
});