package cli

import (
	"bytes"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/spf13/cobra"

	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
	"gitea.mynodes.xyz/ilker/llmgw/internal/store"
)

func TestStatusSaysWhichControlPlaneLeadsAndWhetherTheOthersStandBy(t *testing.T) {
	render := func(s adminapi.Summary) string {
		cmd := &cobra.Command{}
		var b bytes.Buffer
		cmd.SetOut(&b)
		printSummary(cmd, s)
		return b.String()
	}
	out := render(adminapi.Summary{ControlPlanes: adminapi.ControlPlanes{
		Members: []adminapi.ControlPlane{
			{Name: "llmgw-ctl", State: "leading", This: true},
			{Name: "llmgw-ctl02", State: "standing by"},
		},
		Floating: "10.0.0.161", FloatingUp: true,
	}})
	if !strings.Contains(out, "CONTROL   llmgw-ctl leads (this one), llmgw-ctl02 standing by · 10.0.0.161 on the leader") {
		t.Errorf("status:\n%s", out)
	}
	out = render(adminapi.Summary{ControlPlanes: adminapi.ControlPlanes{
		Members: []adminapi.ControlPlane{
			{Name: "llmgw-ctl", State: "not answering"},
			{Name: "llmgw-ctl02", State: "standing by", This: true},
		},
		Floating: "10.0.0.161",
	}})
	for _, want := range []string{"NO LEADER", "llmgw-ctl not answering", "10.0.0.161 NOT ANSWERING"} {
		if !strings.Contains(out, want) {
			t.Errorf("%q missing:\n%s", want, out)
		}
	}
	if out := render(adminapi.Summary{}); strings.Contains(out, "CONTROL") {
		t.Error("a single control plane got a control line")
	}
}

func TestTheProbeAsksEachControlPlaneWhetherItLeads(t *testing.T) {
	leading := httptest.NewServer(http.HandlerFunc(func(http.ResponseWriter, *http.Request) {}))
	defer leading.Close()
	standby := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusServiceUnavailable)
	}))
	defer standby.Close()
	gone := httptest.NewServer(http.NotFoundHandler())
	gone.Close()

	st, err := store.Open(t.Context(), filepath.Join(t.TempDir(), "s.db"))
	if err != nil {
		t.Fatal(err)
	}
	defer st.Close()
	for _, cp := range []store.ControlPlane{
		{URL: "https://10.0.0.1:7443", Name: "one"},
		{URL: "https://10.0.0.2:7443", Name: "two"},
		{URL: "https://10.0.0.3:7443", Name: "three"},
	} {
		if err := st.PutControlPlane(t.Context(), cp); err != nil {
			t.Fatal(err)
		}
	}
	at := map[string]string{"10.0.0.1": leading.URL, "10.0.0.2": standby.URL, "10.0.0.3": gone.URL, "10.0.0.161": leading.URL}
	p := newControlPlaneProbe(st, ":8080")
	floating := filepath.Join(t.TempDir(), "floating")
	if err := os.WriteFile(floating, []byte("10.0.0.161/24\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	p.self, p.floating = "two", floating
	p.leaderURL = func(host string) string { return at[host] + "/leader" }

	s := p.Status()
	got := map[string]adminapi.ControlPlane{}
	for _, m := range s.Members {
		got[m.Name] = m
	}
	if got["one"].State != "leading" || got["two"].State != "standing by" || got["three"].State != "not answering" {
		t.Errorf("states: %+v", got)
	}
	if !got["two"].This || got["one"].This || got["one"].Address != "10.0.0.1" {
		t.Errorf("which and where: %+v", got)
	}
	if !s.FloatingUp {
		t.Error("a floating address on the leader read as down")
	}
}

func TestOneControlPlaneIsNotASetOfThem(t *testing.T) {
	st, err := store.Open(t.Context(), filepath.Join(t.TempDir(), "s.db"))
	if err != nil {
		t.Fatal(err)
	}
	defer st.Close()
	if err := st.PutControlPlane(t.Context(), store.ControlPlane{URL: "https://10.0.0.1:7443", Name: "one"}); err != nil {
		t.Fatal(err)
	}
	if s := newControlPlaneProbe(st, ":8080").Status(); len(s.Members) != 0 {
		t.Errorf("one control plane reported as a set: %+v", s)
	}
}

func TestTheFloatingAddressIsReadFromWhatServerAddWrote(t *testing.T) {
	dir := t.TempDir()
	file := filepath.Join(dir, "floating")
	if err := os.WriteFile(file, []byte("10.0.0.161/24\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if got := floatingAddress(file); got != "10.0.0.161" {
		t.Errorf("read %q", got)
	}
	if err := os.WriteFile(file, []byte("not an address\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if got := floatingAddress(file); got != "" {
		t.Errorf("nonsense read as %q", got)
	}
	if got := floatingAddress(filepath.Join(dir, "none")); got != "" {
		t.Errorf("no file read as %q", got)
	}
}