package migrate

import "testing"

// TestPlannerDecide 验证置信分级 + 冲突检测（P0-07 §2.2 匹配优先级）。
func TestPlannerDecide(t *testing.T) {
	// 构造测试数据：
	// - user 1: phone 13800000001（唯一）+ 现映射种子 → 应判 seed/100
	// - user 2: phone 13800000002（唯一，无种子）→ 应判 phone/90
	// - user 3: phone 13900000003（撞号，user 4 同号）→ 应判 conflict/0
	// - user 4: phone 13900000003（撞号）→ 应判 conflict/0
	// - user 5: 无 phone，有微信 unionid → 应判 unionid/70
	// - user 6: 无 phone、无微信 → 应判 unmapped/50
	// - user 7: phone 归一失败（非大陆号）→ 应判 unmapped/50 + PhoneInvalid
	users := []LegacyUser{
		{ID: 1, PhoneNumber: ptr("13800000001")},
		{ID: 2, PhoneNumber: ptr("13800000002")},
		{ID: 3, PhoneNumber: ptr("13900000003")},
		{ID: 4, PhoneNumber: ptr("13900000003")},
		{ID: 5},
		{ID: 6},
		{ID: 7, PhoneNumber: ptr("12345")},
	}
	assoc := []LegacyAccountAssociation{
		{UserID: 1, MarkingSystemUserID: ptr[int32](999)}, // user 1 有现映射
	}
	wx := []LegacyWeixinUser{
		{OpenID: "openid5", UserID: 5, UnionID: ptr("union5"), AppID: ptr("appid5")},
	}
	p := NewPlanner(users, assoc, wx)

	t.Run("seed 优先", func(t *testing.T) {
		d := p.Decide(1, users[0].PhoneNumber)
		if d.MatchSource != MatchSourceSeed || d.Confidence != ConfidenceSeed {
			t.Fatalf("user1 期望 seed/100, 得 %s/%d", d.MatchSource, d.Confidence)
		}
	})
	t.Run("phone 唯一", func(t *testing.T) {
		d := p.Decide(2, users[1].PhoneNumber)
		if d.MatchSource != MatchSourcePhone || d.Confidence != ConfidencePhone {
			t.Fatalf("user2 期望 phone/90, 得 %s/%d", d.MatchSource, d.Confidence)
		}
	})
	t.Run("phone 撞号冲突", func(t *testing.T) {
		for _, id := range []int32{3, 4} {
			raw := users[id-1].PhoneNumber
			d := p.Decide(id, raw)
			if d.MatchSource != MatchSourceConflict || !d.PhoneConflict || d.Confidence != ConfidenceConflict {
				t.Fatalf("user%d 期望 conflict/0+PhoneConflict, 得 %s/%d conflict=%v",
					id, d.MatchSource, d.Confidence, d.PhoneConflict)
			}
		}
	})
	t.Run("unionid 锚点", func(t *testing.T) {
		d := p.Decide(5, nil)
		if d.MatchSource != MatchSourceUnionid || d.Confidence != ConfidenceUnionid || !d.HasWechat {
			t.Fatalf("user5 期望 unionid/70+HasWechat, 得 %s/%d wechat=%v", d.MatchSource, d.Confidence, d.HasWechat)
		}
	})
	t.Run("unmapped", func(t *testing.T) {
		d := p.Decide(6, nil)
		if d.MatchSource != MatchSourceUnmapped || d.Confidence != ConfidenceUnmapped {
			t.Fatalf("user6 期望 unmapped/50, 得 %s/%d", d.MatchSource, d.Confidence)
		}
	})
	t.Run("phone 归一失败", func(t *testing.T) {
		d := p.Decide(7, users[6].PhoneNumber)
		if !d.PhoneInvalid {
			t.Fatalf("user7 期望 PhoneInvalid=true, 得 false")
		}
	})

	// 撞号组：仅 13900000003 一组（user 3,4）
	groups := p.PhoneConflictGroups()
	if len(groups) != 1 {
		t.Fatalf("期望 1 组撞号, 得 %d 组", len(groups))
	}
	if g, ok := groups["13900000003"]; !ok || len(g) != 2 {
		t.Fatalf("撞号组 13900000003 应含 2 账号, 得 %v", g)
	}
}

// TestPlannerSeedPriorityOverPhone 验证现映射种子优先级高于 phone（即使 phone 也撞号）。
func TestPlannerSeedPriorityOverPhone(t *testing.T) {
	users := []LegacyUser{
		{ID: 10, PhoneNumber: ptr("13700000000")},
		{ID: 11, PhoneNumber: ptr("13700000000")}, // 撞号
	}
	assoc := []LegacyAccountAssociation{{UserID: 10, MarkingSystemUserID: ptr[int32](1)}} // user 10 有种子
	p := NewPlanner(users, assoc, nil)
	d := p.Decide(10, users[0].PhoneNumber)
	// 即使 phone 撞号，user 10 有现映射种子 → seed/100（优先级最高）
	if d.MatchSource != MatchSourceSeed || d.Confidence != ConfidenceSeed {
		t.Fatalf("user10 期望 seed/100（种子优先）, 得 %s/%d", d.MatchSource, d.Confidence)
	}
	// user 11 无种子 → conflict
	d2 := p.Decide(11, users[1].PhoneNumber)
	if d2.MatchSource != MatchSourceConflict {
		t.Fatalf("user11 期望 conflict, 得 %s", d2.MatchSource)
	}
}

// TestPlannerEmptyPhoneSkipsIndex 验证空/无效 phone 不进撞号索引。
func TestPlannerEmptyPhoneSkipsIndex(t *testing.T) {
	users := []LegacyUser{
		{ID: 1, PhoneNumber: nil},
		{ID: 2, PhoneNumber: ptr("")},
		{ID: 3, PhoneNumber: ptr("   ")},
	}
	p := NewPlanner(users, nil, nil)
	if len(p.phoneIndex) != 0 {
		t.Fatalf("空 phone 不进索引, 得 %d 项", len(p.phoneIndex))
	}
}

func ptr[T any](v T) *T { return &v }