package cli

import (
	"bytes"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"
	"testing"

	"gitea.mynodes.xyz/ilker/llmgw/internal/control/adminapi"
	"github.com/spf13/cobra"
)

func TestAQueuedChangeIsNotReportedAsAnError(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.WriteHeader(http.StatusAccepted)
		_, _ = w.Write([]byte(`{"queued":["r1"]}`))
	}))
	defer srv.Close()
	var out struct {
		Queued []string `json:"queued"`
	}
	if err := newCtlClient(srv.URL).post(t.Context(), "/api/v1/restart", []byte(`{}`), &out); err != nil {
		t.Fatalf("202 read as a failure: %v", err)
	}
	if len(out.Queued) != 1 {
		t.Errorf("the body of a 202 was not read: %+v", out)
	}
}

func TestStatusSaysWhoLeadsTheStoreAndWhetherTheRestKeepUp(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{Store: []adminapi.StoreMember{
		{Name: "llmgw-ctl02", Role: "replica", State: "streaming", Lag: 2048},
		{Name: "llmgw-pg01", Role: "leader", State: "running"},
	}})
	if !strings.Contains(out, "STORE     llmgw-ctl02 streaming (2 KB behind), llmgw-pg01 leads") {
		t.Errorf("status:\n%s", out)
	}
	out = render(adminapi.Summary{Store: []adminapi.StoreMember{{Name: "llmgw-pg01", Role: "replica", State: "stopped"}}})
	if !strings.Contains(out, "NO LEADER") {
		t.Errorf("a store with no leader was not called out:\n%s", out)
	}
	if out := render(adminapi.Summary{}); strings.Contains(out, "STORE") {
		t.Error("a single database got a store line")
	}
}

func TestTheSummaryIsWrittenWhereItIsToldNotToTheTerminal(t *testing.T) {
	// The console draws the summary into its panel. Its GPU table went to
	// the terminal instead, through the full screen, every three seconds —
	// on a cluster with a GPU, which the test cluster did not have.
	r, w, err := os.Pipe()
	if err != nil {
		t.Fatal(err)
	}
	stdout := os.Stdout
	os.Stdout = w
	var b bytes.Buffer
	cmd := &cobra.Command{}
	cmd.SetOut(&b)
	printSummary(cmd, adminapi.Summary{
		GPUs:         []adminapi.ClassUse{{Class: "6000-24g", Total: 1, Used: 1}},
		Fabrics:      []adminapi.FabricUse{{Fabric: "ib-a", Nodes: 2}},
		IdleReplicas: []adminapi.IdleReplica{{ID: "r1", Model: "m", IdleSec: 3600, GPUs: 1}},
	})
	os.Stdout = stdout
	_ = w.Close()
	leaked, _ := io.ReadAll(r)
	if len(leaked) > 0 {
		t.Errorf("written to the terminal: %q", leaked)
	}
	for _, want := range []string{"6000-24g", "ib-a", "r1"} {
		if !strings.Contains(b.String(), want) {
			t.Errorf("the summary lacks %q:\n%s", want, b.String())
		}
	}
}