package services

import (
	"strings"
	"testing"
)

// 推送地址纠正：这是「采集器 running 但一条日志都进不去」的根因防护。
func TestHostPushEndpoint(t *testing.T) {
	const ip = "172.19.16.8"
	cases := []struct {
		name       string
		endpoint   string
		hostIP     string
		dockerMode bool
		want       string
		wantErr    string
	}{
		{
			name:     "正常 IP 不动",
			endpoint: "http://172.19.16.8:3100",
			hostIP:   ip,
			want:     "http://172.19.16.8:3100",
		},
		{
			name:     "k8s svc 地址不动（命名空间短名照原样）",
			endpoint: "http://loki.log.svc.cluster.local:3100",
			hostIP:   ip,
			want:     "http://loki.log.svc.cluster.local:3100",
		},
		{
			// 本会话实测踩到：listenIP 填 0.0.0.0 → endpoint 变成 0.0.0.0:3100 → 推送被拒
			name:     "通配地址 0.0.0.0 换成真实主机 IP（两种模式都要换）",
			endpoint: "http://0.0.0.0:3100",
			hostIP:   ip,
			want:     "http://172.19.16.8:3100",
		},
		{
			name:       "容器模式下 127.0.0.1 必须换成主机 IP（bridge 里指向容器自己）",
			endpoint:   "http://127.0.0.1:3100",
			hostIP:     ip,
			dockerMode: true,
			want:       "http://172.19.16.8:3100",
		},
		{
			name:     "systemd 模式下 127.0.0.1 保持原样（同机部署是合法的）",
			endpoint: "http://127.0.0.1:3100",
			hostIP:   ip,
			want:     "http://127.0.0.1:3100",
		},
		{
			name:       "容器模式下 localhost 同样换掉",
			endpoint:   "http://localhost:3100",
			hostIP:     ip,
			dockerMode: true,
			want:       "http://172.19.16.8:3100",
		},
		{
			name:     "缺端口时补 3100",
			endpoint: "http://0.0.0.0",
			hostIP:   ip,
			want:     "http://172.19.16.8:3100",
		},
		{
			name:     "空 endpoint 直接报错",
			endpoint: " ",
			hostIP:   ip,
			wantErr:  "缺少 Loki 推送地址",
		},
		{
			name:     "拿不到主机 IP 时明确报错，而不是返回必然失败的地址",
			endpoint: "http://0.0.0.0:3100",
			hostIP:   "",
			wantErr:  "取不到目标主机 IP",
		},
	}
	for _, c := range cases {
		got, err := hostPushEndpoint(c.endpoint, c.hostIP, c.dockerMode)
		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: %v", c.name, err)
		}
		if got != c.want {
			t.Fatalf("%s: 期望 %q，实际 %q", c.name, c.want, got)
		}
	}
}

// 渲染出来的 promtail 配置里不能再出现 0.0.0.0 这类推不上去的地址。
func TestHostPromtailConfigUsesReachableEndpoint(t *testing.T) {
	fixed, err := hostPushEndpoint("http://0.0.0.0:3100", "172.19.16.8", true)
	if err != nil {
		t.Fatalf("纠正失败: %v", err)
	}
	cfg, err := PromtailConfigForHost(HostPromtailOptions{
		Endpoint: fixed, Cluster: "host", Hostname: "h1", LogPath: "/var/log/a.log",
	})
	if err != nil {
		t.Fatalf("渲染失败: %v", err)
	}
	if strings.Contains(cfg, "0.0.0.0") {
		t.Fatalf("配置里仍是通配地址:\n%s", cfg)
	}
	if !strings.Contains(cfg, "url: http://172.19.16.8:3100/loki/api/v1/push") {
		t.Fatalf("推送地址不是纠正后的地址:\n%s", cfg)
	}
}