package mapping

import (
	"strings"
	"testing"

	"idsync/internal/feishu"
)

// TestFlatDeptInfoParentChild 验证拍平拼音链：子部门链 = 父链.子拼音。
func TestFlatDeptInfoParentChild(t *testing.T) {
	depts := []*feishu.Department{
		dept("od-root", "0", "Acme"),
		dept("od-rd", "od-root", "研发部"),
		dept("od-backend", "od-rd", "后端组"),
	}
	out := FlatDeptInfo(depts, "dc=example,dc=com")

	if out["od-root"].Chain != "Acme" || out["od-root"].Level != 0 {
		t.Errorf("根部门 = %+v", out["od-root"])
	}
	if out["od-rd"].Chain != "Acme.yanfabu" || out["od-rd"].Level != 1 {
		t.Errorf("研发部 = %+v", out["od-rd"])
	}
	if out["od-backend"].Chain != "Acme.yanfabu.houduanzu" || out["od-backend"].Level != 2 {
		t.Errorf("后端组 = %+v", out["od-backend"])
	}
	wantDN := "cn=Acme.yanfabu.houduanzu,ou=groups,dc=example,dc=com"
	if out["od-backend"].DN != wantDN {
		t.Errorf("后端组 DN = %q, 期望 %q", out["od-backend"].DN, wantDN)
	}
}

// TestFlatDeptInfoFallsBackOnEmptyPinyin 验证纯符号部门名回落部门 ID，链非空且稳定。
func TestFlatDeptInfoFallsBackOnEmptyPinyin(t *testing.T) {
	depts := []*feishu.Department{
		dept("od-root", "0", "Acme"),
		dept("od-sym", "od-root", "★☆"),
	}
	out := FlatDeptInfo(depts, "dc=example,dc=com")
	if out["od-sym"].Chain != "Acme.dept-od-sym" {
		t.Errorf("纯符号部门链 = %q, 期望回落部门 ID", out["od-sym"].Chain)
	}
	if !strings.Contains(out["od-sym"].DN, out["od-sym"].Chain) {
		t.Errorf("DN 未包含 Chain: %q", out["od-sym"].DN)
	}
}

// TestFlatDeptInfoDisambiguatesCollision 验证同名部门消歧：链撞车时追加部门 ID，组名保持唯一。
func TestFlatDeptInfoDisambiguatesCollision(t *testing.T) {
	depts := []*feishu.Department{
		dept("od-root", "0", "Acme"),
		dept("od-a", "od-root", "开发组"),
		dept("od-b", "od-root", "开发组"),
	}
	out := FlatDeptInfo(depts, "dc=example,dc=com")

	if out["od-a"].Chain != "Acme.kaifazu" {
		t.Errorf("od-a 链 = %q", out["od-a"].Chain)
	}
	if out["od-b"].Chain != "Acme.kaifazu.od-b" {
		t.Errorf("od-b 链 = %q, 期望追加部门 ID 消歧", out["od-b"].Chain)
	}
	if out["od-a"].DN == out["od-b"].DN {
		t.Errorf("两个同名部门的 DN 不应相同")
	}
}

// TestFlatDeptInfoStable 验证同一输入产生的 DN 稳定（幂等，便于物化比对）。
func TestFlatDeptInfoStable(t *testing.T) {
	depts := []*feishu.Department{
		dept("od-root", "0", "Acme"),
		dept("od-rd", "od-root", "研发部"),
	}
	a := FlatDeptInfo(depts, "dc=example,dc=com")
	b := FlatDeptInfo(depts, "dc=example,dc=com")
	for id := range a {
		if a[id].DN != b[id].DN || a[id].Chain != b[id].Chain {
			t.Errorf("部门 %s 的命名不稳定: %q vs %q", id, a[id].DN, b[id].DN)
		}
	}
}