package cli

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"runtime"
	"strings"
	"testing"
	"time"

	"github.com/spf13/cobra"

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

func TestTheServicesHereAreFoundAndAskedAbout(t *testing.T) {
	old, oldRun := unitDir, serviceRunner
	unitDir = t.TempDir()
	t.Cleanup(func() { unitDir, serviceRunner = old, oldRun })
	for _, u := range []string{"llmgw-server", "llmgw-agent"} {
		_ = os.WriteFile(filepath.Join(unitDir, u+".service"), []byte("[Unit]"), 0o644)
	}
	var asked []string
	serviceRunner = func(_ context.Context, args ...string) (string, error) {
		asked = append(asked, strings.Join(args, " "))
		if args[0] == "is-active" {
			return "active", nil
		}
		return "Wed 2026-10-07 12:00:00 UTC", nil
	}

	units, err := installedServices(context.Background(), nil)
	if err != nil || strings.Join(units, ",") != "llmgw-server,llmgw-agent" {
		t.Fatalf("%v %v", units, err)
	}
	if _, err := installedServices(context.Background(), []string{"mirror"}); err == nil ||
		!strings.Contains(err.Error(), "server, agent") {
		t.Errorf("a service not here: %v", err)
	}
	if u, err := installedServices(context.Background(), []string{"agent"}); err != nil || len(u) != 1 {
		t.Errorf("one named: %v %v", u, err)
	}

	if runtime.GOOS != "linux" {
		return
	}
	var out bytes.Buffer
	c := serviceVerbs()[0]
	c.SetOut(&out)
	c.SetContext(context.Background())
	if err := c.RunE(c, nil); err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(out.String(), "server") || !strings.Contains(out.String(), "active") {
		t.Errorf("%s", out.String())
	}
}

func TestStopSetsTheClustersServingStopped(t *testing.T) {
	var put adminapi.SettingsRequest
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case r.URL.Path == "/api/v1/summary":
			_ = json.NewEncoder(w).Encode(adminapi.Summary{})
		case r.Method == "GET" && r.URL.Path == "/api/v1/settings":
			_ = json.NewEncoder(w).Encode(adminapi.SettingsView{Version: 3, Body: "router:\n  retries: 2\n"})
		case r.Method == "PUT" && r.URL.Path == "/api/v1/settings":
			_ = json.NewDecoder(r.Body).Decode(&put)
			_ = json.NewEncoder(w).Encode(adminapi.SettingsView{Version: 4, Body: put.Body})
		default:
			http.NotFound(w, r)
		}
	}))
	defer srv.Close()
	dir := t.TempDir()
	cfg := filepath.Join(dir, "server.yaml")
	_ = os.WriteFile(filepath.Join(dir, "token"), []byte("t"), 0o600)
	_ = os.WriteFile(cfg, []byte("listen: \":8080\"\nagent_insecure: true\nadmin_listen: "+
		strings.TrimPrefix(srv.URL, "http://")+"\nadmin_remote: true\nadmin_token_file: "+filepath.Join(dir, "token")+"\n"), 0o600)

	var stop *cobra.Command
	for _, c := range newSystemCmds() {
		if c.Name() == "stop" {
			stop = c
		}
	}
	var out bytes.Buffer
	stop.SetOut(&out)
	stop.SetArgs([]string{"--config", cfg, "--note", "maintenance"})
	if err := stop.ExecuteContext(context.Background()); err != nil {
		t.Fatalf("%v: %s", err, out.String())
	}
	if put.Base != 3 || !strings.Contains(put.Body, "stopped: true") || !strings.Contains(put.Body, "retries: 2") ||
		put.Note != "maintenance" {
		t.Errorf("sent %+v", put)
	}
	if !strings.Contains(out.String(), "stopping") {
		t.Errorf("%s", out.String())
	}
}

// Started while the control plane has not yet taken the setting up: every
// model of a stopped system has the nothing it asks for, which is not
// serving.
func TestStartWaitsForTheControlPlaneToServe(t *testing.T) {
	old := servicePoll
	servicePoll = time.Millisecond
	t.Cleanup(func() { servicePoll = old })
	answers := []adminapi.Summary{
		{Stopped: true, Models: adminapi.ModelTotals{Total: 2, Satisfied: 2}},
		{Models: adminapi.ModelTotals{Total: 2, Satisfied: 0}},
		{Models: adminapi.ModelTotals{Total: 2, Satisfied: 2}},
	}
	asked := 0
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		_ = json.NewEncoder(w).Encode(answers[min(asked, len(answers)-1)])
		asked++
	}))
	defer srv.Close()

	var out bytes.Buffer
	cmd := &cobra.Command{}
	cmd.SetOut(&out)
	cmd.SetContext(context.Background())
	c := &ctlClient{base: srv.URL, http: srv.Client()}
	if err := waitForService(cmd, func() *ctlClient { return c }, false); err != nil {
		t.Fatal(err)
	}
	if asked != 3 {
		t.Errorf("returned after %d answers: %s", asked, out.String())
	}
}