package norm

import "testing"

// TestPhone 验证 phone 强归一规则（P0-06 §2.1 五步顺序）。
func TestPhone(t *testing.T) {
	cases := []struct {
		name      string
		raw       string
		wantCanon string
		wantOK    bool
	}{
		// 标准 11 位
		{"纯 11 位", "13800000000", "13800000000", true},
		{"前后空白", "  13800000000  ", "13800000000", true},
		// 去分隔符
		{"横线分隔", "138-0000-0000", "13800000000", true},
		{"点号分隔", "138.0000.0000", "13800000000", true},
		{"空格分隔", "138 0000 0000", "13800000000", true},
		// 国际前缀
		{"+86 前缀", "+8613800000000", "13800000000", true},
		{"0086 前缀", "008613800000000", "13800000000", true},
		{"86 前缀无加号", "8613800000000", "13800000000", true},
		{"0086 后非大陆号段", "008610800000000", "", false}, // 剥 0086 后 108... 号段不符 → 不剥，整体也非 11 位 → false
		{"86 后非大陆号段", "8610800000000", "", false},
		// 异常
		{"空串", "", "", false},
		{"仅空白", "   ", "", false},
		{"10 位", "1380000000", "", false},
		{"12 位", "138000000001", "", false},
		{"号段不符 10 开头", "10800000000", "", false},
		{"号段不符 12 开头", "12800000000", "", false},
		{"含字母", "1380000000a", "", false},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			got, ok := Phone(c.raw)
			if got != c.wantCanon || ok != c.wantOK {
				t.Fatalf("Phone(%q) = (%q, %v), want (%q, %v)", c.raw, got, ok, c.wantCanon, c.wantOK)
			}
		})
	}
}

// TestPhoneIdempotent 验证幂等性：归一(归一(x)) == 归一(x)。
func TestPhoneIdempotent(t *testing.T) {
	raws := []string{"+8613800000000", "138-0000-0000", "138.0000.0000", " 13800000000 ", "8613800000000"}
	for _, raw := range raws {
		first, ok1 := Phone(raw)
		if !ok1 {
			t.Fatalf("Phone(%q) 首次归一失败，无法验证幂等", raw)
		}
		second, ok2 := Phone(first)
		if second != first || !ok2 {
			t.Fatalf("Phone 非幂等：Phone(%q)=(%q,%v) → 再归一 (%q,%v)", raw, first, ok1, second, ok2)
		}
	}
}

// TestWechatOpenID 验证 wechat openid 仅 trim。
func TestWechatOpenID(t *testing.T) {
	cases := []struct {
		name      string
		raw       string
		wantCanon string
		wantOK    bool
	}{
		{"标准", "openid_abc123", "openid_abc123", true},
		{"含空白", "  openid_abc123  ", "openid_abc123", true},
		{"空串", "", "", false},
		{"仅空白", "   ", "", false},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			got, ok := WechatOpenID(c.raw)
			if got != c.wantCanon || ok != c.wantOK {
				t.Fatalf("WechatOpenID(%q) = (%q, %v), want (%q, %v)", c.raw, got, ok, c.wantCanon, c.wantOK)
			}
		})
	}
}

// TestEmail 验证 email 轻归一（trim + 小写 + 正则）。
func TestEmail(t *testing.T) {
	cases := []struct {
		name      string
		raw       string
		wantCanon string
		wantOK    bool
	}{
		{"标准", "User@Example.COM", "user@example.com", true},
		{"含空白", "  user@example.com  ", "user@example.com", true},
		{"保留 +tag", "user+tag@example.com", "user+tag@example.com", true},
		{"缺域名点", "user@examplecom", "", false},
		{"缺 @", "userexample.com", "", false},
		{"空串", "", "", false},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			got, ok := Email(c.raw)
			if got != c.wantCanon || ok != c.wantOK {
				t.Fatalf("Email(%q) = (%q, %v), want (%q, %v)", c.raw, got, ok, c.wantCanon, c.wantOK)
			}
		})
	}
}

// TestUsername 验证 username 轻归一（trim + 剔除不可见字符 + 小写，无 ok）。
func TestUsername(t *testing.T) {
	cases := []struct {
		name string
		raw  string
		want string
	}{
		{"标准", "ZhangSan", "zhangsan"},
		{"含空白", "  ZhangSan  ", "zhangsan"},
		{"空串", "", ""},
		{"已小写", "abc123", "abc123"},
		// 回归（e2e 实测 yuansiwei_i.t_user id=44008）：
		// U+202D LTR-MARK + 号码 + U+202C POP DIRECTIONAL FORMATTING 包裹 →
		// 剔除后与干净值同串，命中"首个占用者"规则而非字节不同绕过去重撞唯一键。
		{"bidi 控制符包裹", "\u202D18077117616\u202C", "18077117616"},
		{"零宽空格 U+200B (Cf)", "a\u200Bb", "ab"},
		{"零宽非连接符 U+200C + 软连字符 U+00AD", "a\u200Cb\u00ADC", "abc"},
		{"双向嵌入 U+202A 中段", "Zhang\u202ASan\u202C", "zhangsan"},
	}
	for _, c := range cases {
		t.Run(c.name, func(t *testing.T) {
			got := Username(c.raw)
			if got != c.want {
				t.Fatalf("Username(%q) = %q, want %q", c.raw, got, c.want)
			}
		})
	}
}

// TestUsernameCollisionAfterStrip 验证"同账号字节不同"在归一后收敛为同一串
// （44008 脏 username 与 42020 干净 username 归一结果相等 → 迁移侧首个占用者规则生效）。
func TestUsernameCollisionAfterStrip(t *testing.T) {
	clean := Username("18077117616")
	dirty := Username("\u202D18077117616\u202C")
	if clean != dirty {
		t.Fatalf("归一后应相等（同账号不同字节形态）：clean=%q dirty=%q", clean, dirty)
	}
}

// TestEmailInvisibleStripped 验证 email 归一同样剔除不可见字符（t_identity.email 亦走唯一键）。
func TestEmailInvisibleStripped(t *testing.T) {
	canon, ok := Email("user\u200Bname@example.com")
	if !ok || canon != "username@example.com" {
		t.Fatalf("Email 应剔除零宽空格并归一：got=(%q,%v)", canon, ok)
	}
}