"""对齐 Muse P10 结账检测测试：detect_checkout 纯函数。

只用标准库，不启动浏览器、不联网。覆盖：
- URL 信号（结账路径 / 购物车 / 普通页 / 坏 URL）；
- 无障碍树信号（支付字段 / 密码字段 / 下单按钮 / 金额文本）；
- 中英文特征；节点为空；页面金额只作展示信号。
"""

import sys
import unittest
from pathlib import Path

try:
    from cloud.chv.checkout_detect import detect_checkout
except ImportError:
    sys.path.insert(0, str(Path(__file__).resolve().parents[2]))
    from cloud.chv.checkout_detect import detect_checkout


def _node(role: str, name: str) -> dict:
    return {"role": role, "name": name}


class CheckoutUrlTest(unittest.TestCase):
    def test_checkout_path_is_checkout_high(self) -> None:
        verdict = detect_checkout("https://shop.example.com/checkout")
        self.assertTrue(verdict.is_checkout)
        self.assertEqual(verdict.confidence, "medium")
        self.assertIn("checkout_url", verdict.reasons)

    def test_payment_path_is_checkout(self) -> None:
        verdict = detect_checkout(
            "https://shop.example.com/order/payment?step=2")
        self.assertTrue(verdict.is_checkout)
        self.assertIn("checkout_url", verdict.reasons)

    def test_cart_path_is_not_checkout(self) -> None:
        verdict = detect_checkout("https://shop.example.com/cart")
        self.assertFalse(verdict.is_checkout)
        self.assertEqual(verdict.confidence, "low")
        self.assertIn("cart_url", verdict.reasons)

    def test_plain_page_is_not_checkout(self) -> None:
        verdict = detect_checkout("https://shop.example.com/products/1")
        self.assertFalse(verdict.is_checkout)
        self.assertEqual(verdict.confidence, "low")
        self.assertEqual(verdict.reasons, [])

    def test_bad_url_does_not_crash(self) -> None:
        verdict = detect_checkout("::::not a url::::")
        self.assertFalse(verdict.is_checkout)

    def test_no_nodes_url_only_decision(self) -> None:
        verdict = detect_checkout(
            "https://shop.example.com/checkout", None)
        self.assertTrue(verdict.is_checkout)


class CheckoutNodesTest(unittest.TestCase):
    def test_payment_fields_make_checkout_high(self) -> None:
        nodes = [_node("textbox", "Card number"),
                 _node("textbox", "Expiry date"),
                 _node("textbox", "Security code (CVC)")]
        verdict = detect_checkout("https://shop.example.com/buy",
                                  nodes)
        self.assertTrue(verdict.is_checkout)
        self.assertEqual(verdict.confidence, "high")
        self.assertEqual(verdict.form_risk, "payment")
        self.assertIn("payment_fields", verdict.reasons)

    def test_password_field_marks_form_risk(self) -> None:
        nodes = [_node("textbox", "Password")]
        verdict = detect_checkout("https://shop.example.com/login",
                                  nodes)
        self.assertFalse(verdict.is_checkout)
        self.assertEqual(verdict.form_risk, "password")

    def test_order_button_plus_amount_is_checkout(self) -> None:
        nodes = [_node("button", "Place order"),
                 _node("text", "Total: $50.00")]
        verdict = detect_checkout("https://shop.example.com/review",
                                  nodes)
        self.assertTrue(verdict.is_checkout)
        self.assertEqual(verdict.confidence, "medium")
        self.assertEqual(verdict.amount_text, "$50.00")

    def test_order_button_alone_is_not_checkout(self) -> None:
        nodes = [_node("button", "Place order")]
        verdict = detect_checkout("https://shop.example.com/review",
                                  nodes)
        self.assertFalse(verdict.is_checkout)

    def test_amount_only_is_not_checkout(self) -> None:
        nodes = [_node("text", "Total: $50.00")]
        verdict = detect_checkout("https://shop.example.com/review",
                                  nodes)
        self.assertFalse(verdict.is_checkout)
        self.assertEqual(verdict.amount_text, "$50.00")

    def test_chinese_payment_hints(self) -> None:
        nodes = [_node("textbox", "卡号"),
                 _node("button", "立即支付")]
        verdict = detect_checkout("https://shop.example.com/buy",
                                  nodes)
        self.assertTrue(verdict.is_checkout)
        self.assertEqual(verdict.form_risk, "payment")

    def test_checkout_url_plus_payment_fields_high(self) -> None:
        nodes = [_node("textbox", "Card number"),
                 _node("button", "Pay now")]
        verdict = detect_checkout("https://shop.example.com/checkout",
                                  nodes)
        self.assertTrue(verdict.is_checkout)
        self.assertEqual(verdict.confidence, "high")
        self.assertIn("checkout_url", verdict.reasons)
        self.assertIn("payment_fields", verdict.reasons)

    def test_yen_and_currency_code_amounts(self) -> None:
        nodes = [_node("text", "合計：¥1,200"),
                 _node("text", "Total 25.00 USD")]
        verdict = detect_checkout("https://shop.example.com/review",
                                  nodes)
        self.assertEqual(verdict.amount_text, "¥1,200")

    def test_empty_nodes_plain_page(self) -> None:
        verdict = detect_checkout("https://shop.example.com/", [])
        self.assertFalse(verdict.is_checkout)
        self.assertIsNone(verdict.form_risk)
        self.assertIsNone(verdict.amount_text)


if __name__ == "__main__":
    unittest.main()