package services

import (
	"strings"
	"testing"
)

// 托管方式选择是「卸载时删容器还是删 unit」的唯一依据，四条分支都要钉死。
func TestChooseHostRunMode(t *testing.T) {
	cases := []struct {
		name    string
		caps    *HostCapabilities
		want    string
		wantErr string
	}{
		{
			name: "docker 可用 → 容器（即使同时有 systemd 也优先容器）",
			caps: &HostCapabilities{HasDocker: true, DockerUsable: true, HasSystemd: true},
			want: HostRunModeDocker,
		},
		{
			name: "装了 docker 但 daemon 没起来 → 回退 systemd",
			caps: &HostCapabilities{HasDocker: true, DockerUsable: false, HasSystemd: true},
			want: HostRunModeSystemd,
		},
		{
			name:    "没有 docker 也没有 systemd → 明确报错，不裸跑",
			caps:    &HostCapabilities{HasDocker: false, DockerUsable: false, HasSystemd: false},
			wantErr: "既没有可用的 Docker",
		},
		{
			name:    "探测结果缺失 → 报错而不是猜一个",
			caps:    nil,
			wantErr: "缺少目标机能力探测结果",
		},
	}
	for _, c := range cases {
		got, err := chooseHostRunMode(c.caps)
		if c.wantErr != "" {
			if err == nil || !strings.Contains(err.Error(), c.wantErr) {
				t.Fatalf("%s: 期望报错含 %q，实际 got=%q err=%v", c.name, c.wantErr, got, err)
			}
			continue
		}
		if err != nil {
			t.Fatalf("%s: 不应报错，实际 %v", c.name, err)
		}
		if got != c.want {
			t.Fatalf("%s: 期望 %q，实际 %q", c.name, c.want, got)
		}
	}
}

func TestNormalizeArch(t *testing.T) {
	for in, want := range map[string]string{
		"x86_64": "amd64", "amd64": "amd64", "aarch64": "arm64", "arm64": "arm64",
	} {
		got, err := normalizeArch(in)
		if err != nil || got != want {
			t.Fatalf("%s → %q (err=%v)，期望 %q", in, got, err, want)
		}
	}
	if _, err := normalizeArch("mips64"); err == nil {
		t.Fatal("未知架构应报错")
	}
}

// 容器名必须带上采集器 ID：同一台机器可能装多个主机采集器，
// 用固定名字会互相覆盖（第二个部署把第一个容器删掉）。
func TestPromtailContainerNameIsPerCollector(t *testing.T) {
	a, b := promtailContainerName(2), promtailContainerName(3)
	if a == b {
		t.Fatalf("不同采集器不能共用容器名: %s", a)
	}
	if !strings.HasPrefix(a, "lokistack-promtail-") {
		t.Fatalf("容器名不符合约定: %s", a)
	}
}

// 探测摘要要能一眼区分「没装 docker」和「装了但起不来」——这两种处置完全不同。
func TestDockerSummaryDistinguishesStates(t *testing.T) {
	missing := (&HostCapabilities{}).DockerSummary()
	broken := (&HostCapabilities{HasDocker: true}).DockerSummary()
	ok := (&HostCapabilities{HasDocker: true, DockerUsable: true, DockerVersion: "27.5.1", DockerEnabled: "enabled"}).DockerSummary()

	if !strings.Contains(missing, "未安装") {
		t.Fatalf("未安装 docker 的摘要不对: %s", missing)
	}
	if !strings.Contains(broken, "不可用") || strings.Contains(broken, "未安装") {
		t.Fatalf("装了但不可用的摘要不对: %s", broken)
	}
	if !strings.Contains(ok, "27.5.1") || !strings.Contains(ok, "enabled") {
		t.Fatalf("可用状态的摘要不对: %s", ok)
	}
}