package service

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"
)

func TestRemoteWorkflowErrorBranches(t *testing.T) {
	kube := fakeKubeServer(t)
	installKubeFactory(t, kube)
	app := newTestApp(t)
	app.settings.Namespace = "maintenance"
	app.settings.RunnerImageARM64 = ""

	if _, err := app.RefreshDevices("titan-22"); err == nil {
		t.Fatal("expected RefreshDevices to fail without runner image")
	}

	job := app.newJob("build", "titan-15", "", "")
	app.runBuild(job, false)
	if got := app.job(job.ID); got == nil || got.Status != JobError {
		t.Fatalf("expected build job error, got %#v", got)
	}

	job = app.newJob("flash", "titan-15", "titan-22", "/dev/sdz")
	if err := app.flashArtifact(job.ID, "registry.example/metis/titan-15"); err == nil {
		t.Fatal("expected flashArtifact error")
	}

	app.setJob(job.ID, func(j *Job) {
		j.Status = JobRunning
		j.Stage = "build"
		j.StageStartedAt = time.Now().Add(-30 * time.Second)
	})
	app.heartbeatRemoteJob(job.ID)
	if got := app.job(job.ID); got == nil || got.ProgressPct == 0 {
		t.Fatalf("expected heartbeat progress, got %#v", got)
	}
}

func TestRemoteWorkflowMissingRunnerImageBranch(t *testing.T) {
	kube := fakeKubeServer(t)
	harbor := fakeHarborServer(t, true)
	installKubeFactory(t, kube)
	app := newTestApp(t)
	app.settings.Namespace = "maintenance"
	app.settings.RunnerImageARM64 = ""
	app.settings.HarborAPIBase = harbor.URL + "/api/v2.0"
	app.settings.HarborUsername = "admin"
	app.settings.HarborPassword = "pw"
	app.settings.HarborProject = "metis"
	app.settings.HarborRegistry = "registry.example"
	app.settings.ArtifactStatePath = filepath.Join(t.TempDir(), "artifacts.json")

	job := app.newJob("build", "titan-15", "", "")
	app.runBuild(job, false)
	if got := app.job(job.ID); got == nil || got.Status != JobError {
		t.Fatalf("expected build job error, got %#v", got)
	}
}

func TestRefreshDevicesDefaultSortAndErrorBranches(t *testing.T) {
	t.Run("default host and deterministic sorting", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{
			deviceMessage: `{"devices":[{"name":"sdc","path":"/dev/sdc","model":"Micro SD","transport":"usb","type":"disk","removable":true,"hotplug":true,"size_bytes":64000000000},{"name":"sdb","path":"/dev/sdb","model":"Micro SD","transport":"usb","type":"disk","removable":true,"hotplug":true,"size_bytes":32000000000},{"name":"sda","path":"/dev/sda","model":"Micro SD","transport":"usb","type":"disk","removable":true,"hotplug":true,"size_bytes":32000000000}]}`,
		})
		installKubeFactory(t, kube)
		app := remoteTestApp(t, nil)

		devices, err := app.RefreshDevices("")
		if err != nil {
			t.Fatalf("RefreshDevices: %v", err)
		}
		if len(devices) != 3 || devices[0].Path != "/dev/sda" || devices[1].Path != "/dev/sdb" {
			t.Fatalf("unexpected sorted devices: %#v", devices)
		}
	})

	t.Run("remote pod failure records device error", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{devicePhase: "Failed", deviceMessage: "device scan failed"})
		installKubeFactory(t, kube)
		app := remoteTestApp(t, nil)

		if _, err := app.RefreshDevices("titan-22"); err == nil || !strings.Contains(err.Error(), "device scan failed") {
			t.Fatalf("expected device scan failure, got %v", err)
		}
		if _, err := app.cachedDevices("titan-22"); err == nil || !strings.Contains(err.Error(), "device scan failed") {
			t.Fatalf("expected cached device error, got %v", err)
		}
	})

	t.Run("malformed device payload records decode error", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{deviceMessage: "{"})
		installKubeFactory(t, kube)
		app := remoteTestApp(t, nil)

		if _, err := app.RefreshDevices("titan-22"); err == nil || !strings.Contains(err.Error(), "decode remote devices") {
			t.Fatalf("expected device decode failure, got %v", err)
		}
	})
}

func TestRunBuildAdditionalRemoteBranches(t *testing.T) {
	t.Run("missing inventory node", func(t *testing.T) {
		app := remoteTestApp(t, nil)
		job := app.newJob("build", "missing-node", "", "")
		app.runBuild(job, false)
		if got := app.job(job.ID); got == nil || got.Status != JobError {
			t.Fatalf("expected missing-node job error, got %#v", got)
		}
	})

	t.Run("no eligible builder", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{nodes: []map[string]any{}})
		harbor := fakeHarborServer(t, true)
		installKubeFactory(t, kube)
		app := remoteTestApp(t, harbor)

		job := app.newJob("build", "titan-15", "", "")
		app.runBuild(job, false)
		if got := app.job(job.ID); got == nil || got.Status != JobError || !strings.Contains(got.Error, "no build host") {
			t.Fatalf("expected builder selection error, got %#v", got)
		}
	})

	t.Run("build pod failure", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{buildPhase: "Failed", buildMessage: "build crashed"})
		harbor := fakeHarborServer(t, true)
		installKubeFactory(t, kube)
		app := remoteTestApp(t, harbor)

		job := app.newJob("build", "titan-15", "", "")
		app.runBuild(job, false)
		if got := app.job(job.ID); got == nil || got.Status != JobError || !strings.Contains(got.Error, "build crashed") {
			t.Fatalf("expected build pod error, got %#v", got)
		}
	})

	t.Run("build output decode failure", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{buildMessage: "{"})
		harbor := fakeHarborServer(t, true)
		installKubeFactory(t, kube)
		app := remoteTestApp(t, harbor)

		job := app.newJob("build", "titan-15", "", "")
		app.runBuild(job, false)
		if got := app.job(job.ID); got == nil || got.Status != JobError || !strings.Contains(got.Error, "decode remote build output") {
			t.Fatalf("expected build decode error, got %#v", got)
		}
	})

	t.Run("artifact persistence failure", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{})
		harbor := fakeHarborServer(t, true)
		installKubeFactory(t, kube)
		app := remoteTestApp(t, harbor)
		app.settings.ArtifactStatePath = t.TempDir()

		job := app.newJob("build", "titan-15", "", "")
		app.runBuild(job, false)
		if got := app.job(job.ID); got == nil || got.Status != JobError {
			t.Fatalf("expected artifact persist error, got %#v", got)
		}
	})

	t.Run("prune warning still completes build", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{})
		harbor := harborPruneFailureServer(t)
		installKubeFactory(t, kube)
		app := remoteTestApp(t, harbor)

		job := app.newJob("build", "titan-15", "", "")
		app.runBuild(job, false)
		got := app.job(job.ID)
		if got == nil || got.Status != JobDone {
			t.Fatalf("expected build to finish despite prune warning, got %#v", got)
		}
		if events := app.recentEvents(5); len(events) == 0 || events[0].Kind != "image.build" {
			t.Fatalf("expected image build event, got %#v", events)
		}
	})

	t.Run("flash preflight rejects stale device", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{})
		harbor := fakeHarborServer(t, true)
		installKubeFactory(t, kube)
		app := remoteTestApp(t, harbor)

		job := app.newJob("replace", "titan-15", "titan-22", "/dev/sda")
		app.runBuild(job, true)
		if got := app.job(job.ID); got == nil || got.Status != JobError || !strings.Contains(got.Error, "not a current flash candidate") {
			t.Fatalf("expected stale device error, got %#v", got)
		}
	})

	t.Run("flash pod failure", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{flashPhase: "Failed", flashMessage: "flash failed"})
		harbor := fakeHarborServer(t, true)
		installKubeFactory(t, kube)
		app := remoteTestApp(t, harbor)

		job := app.newJob("replace", "titan-15", "titan-22", "/dev/sdz")
		app.runBuild(job, true)
		if got := app.job(job.ID); got == nil || got.Status != JobError || !strings.Contains(got.Error, "flash failed") {
			t.Fatalf("expected flash pod error, got %#v", got)
		}
	})

	t.Run("host tmp flash completion message", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{})
		harbor := fakeHarborServer(t, true)
		installKubeFactory(t, kube)
		app := remoteTestApp(t, harbor)

		job := app.newJob("replace", "titan-15", "titan-22", hostTmpDevicePath)
		app.runBuild(job, true)
		if got := app.job(job.ID); got == nil || got.Status != JobDone || !strings.Contains(got.Message, "host /tmp") {
			t.Fatalf("expected hosttmp completion, got %#v", got)
		}
	})

	t.Run("node delete warning still flashes", func(t *testing.T) {
		kube := remoteWorkflowKubeServer(t, remoteKubeOptions{deleteNodeStatus: http.StatusInternalServerError})
		harbor := fakeHarborServer(t, true)
		installKubeFactory(t, kube)
		tmp := t.TempDir()
		kubectl := filepath.Join(tmp, "kubectl")
		if err := os.WriteFile(kubectl, []byte("#!/usr/bin/env sh\nprintf 'delete denied' >&2\nexit 1\n"), 0o755); err != nil {
			t.Fatal(err)
		}
		t.Setenv("PATH", tmp+string(os.PathListSeparator)+os.Getenv("PATH"))
		app := remoteTestApp(t, harbor)

		job := app.newJob("replace", "titan-15", "titan-22", "/dev/sdz")
		app.runBuild(job, true)
		if got := app.job(job.ID); got == nil || got.Status != JobDone {
			t.Fatalf("expected flash success despite delete warning, got %#v", got)
		}
		found := false
		for _, event := range app.recentEvents(10) {
			if event.Kind == "node.delete.warning" {
				found = true
			}
		}
		if !found {
			t.Fatalf("expected node.delete.warning event, got %#v", app.recentEvents(10))
		}
	})
}

func TestFlashArtifactAndHeartbeatBranches(t *testing.T) {
	kube := remoteWorkflowKubeServer(t, remoteKubeOptions{})
	installKubeFactory(t, kube)
	app := remoteTestApp(t, nil)

	job := app.newJob("replace", "titan-15", "missing-host", "/dev/sdz")
	if err := app.flashArtifact(job.ID, "registry.example/metis/titan-15"); err == nil || !strings.Contains(err.Error(), "not a current cluster node") {
		t.Fatalf("expected missing host flashArtifact error, got %v", err)
	}

	app.heartbeatRemoteJob("")
	app.heartbeatRemoteJob(job.ID)
	if got := app.job(job.ID); got == nil || got.ProgressPct != 0 {
		t.Fatalf("queued heartbeat should be a no-op, got %#v", got)
	}

	app.setJob(job.ID, func(j *Job) {
		j.Status = JobRunning
		j.Stage = "preflight"
		j.Device = "/dev/sdz"
		j.Host = "titan-22"
		j.ProgressPct = 10
	})
	app.heartbeatRemoteJob(job.ID)
	if got := app.job(job.ID); got == nil || got.ProgressPct != 80 || !strings.Contains(got.Message, "Validating") {
		t.Fatalf("preflight heartbeat = %#v", got)
	}

	app.setJob(job.ID, func(j *Job) {
		j.Stage = "flash"
		j.ProgressPct = 80
		j.Written = 120
		j.Total = 100
	})
	app.heartbeatRemoteJob(job.ID)
	if got := app.job(job.ID); got == nil || got.ProgressPct != 98 || !strings.Contains(got.Message, "Writing") {
		t.Fatalf("flash byte heartbeat = %#v", got)
	}

	app.setJob(job.ID, func(j *Job) {
		j.Stage = "flash"
		j.StageStartedAt = time.Time{}
		j.StartedAt = time.Now().Add(-20 * time.Second)
		j.ProgressPct = 80
		j.Written = 0
		j.Total = 0
	})
	app.heartbeatRemoteJob(job.ID)
	if got := app.job(job.ID); got == nil || got.ProgressPct <= 80 || !strings.Contains(got.Message, "Writing") {
		t.Fatalf("flash elapsed heartbeat = %#v", got)
	}
}

type remoteKubeOptions struct {
	nodes            []map[string]any
	devicePhase      string
	deviceMessage    string
	buildPhase       string
	buildMessage     string
	flashPhase       string
	flashMessage     string
	deleteNodeStatus int
}

func remoteTestApp(t *testing.T, harbor *httptest.Server) *App {
	t.Helper()
	app := newTestApp(t)
	app.settings.Namespace = "maintenance"
	app.settings.RunnerImageARM64 = "runner:arm64"
	app.settings.HarborProject = "metis"
	app.settings.HarborRegistry = "registry.example"
	app.settings.ArtifactStatePath = filepath.Join(t.TempDir(), "artifacts.json")
	if harbor != nil {
		app.settings.HarborAPIBase = harbor.URL + "/api/v2.0"
		app.settings.HarborUsername = "admin"
		app.settings.HarborPassword = "pw"
	}
	return app
}

func remoteWorkflowKubeServer(t *testing.T, opts remoteKubeOptions) *httptest.Server {
	t.Helper()
	devicePhase := defaultString(opts.devicePhase, "Succeeded")
	deviceMessage := defaultString(opts.deviceMessage, `{"devices":[{"name":"sdz","path":"/dev/sdz","model":"Micro SD","transport":"usb","type":"disk","removable":true,"hotplug":true,"size_bytes":32000000000},{"name":"tmp","path":"hosttmp:///tmp","model":"Host /tmp","transport":"test","type":"file","note":"Test-only host write target under /tmp","size_bytes":1}]}`)
	buildPhase := defaultString(opts.buildPhase, "Succeeded")
	buildMessage := defaultString(opts.buildMessage, `{"local_path":"/workspace/build/titan-15.img.xz","compressed":true,"size_bytes":1234,"build_tag":"build-1"}`)
	flashPhase := defaultString(opts.flashPhase, "Succeeded")
	flashMessage := defaultString(opts.flashMessage, `{"dest_path":"/tmp/metis-flash-test/titan-15.img"}`)
	nodes := opts.nodes
	if nodes == nil {
		nodes = []map[string]any{
			{
				"metadata": map[string]any{
					"name": "titan-22",
					"labels": map[string]string{
						"kubernetes.io/arch":             "arm64",
						"hardware":                       "rpi5",
						"node-role.kubernetes.io/worker": "true",
					},
				},
				"spec": map[string]any{"unschedulable": false},
			},
		}
	}
	deleteNodeStatus := opts.deleteNodeStatus
	if deleteNodeStatus == 0 {
		deleteNodeStatus = http.StatusOK
	}
	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case r.Method == http.MethodGet && r.URL.Path == "/api/v1/nodes":
			_ = json.NewEncoder(w).Encode(map[string]any{"items": nodes})
		case r.Method == http.MethodGet && r.URL.Path == "/api/v1/namespaces/maintenance/pods":
			_ = json.NewEncoder(w).Encode(map[string]any{"items": []any{}})
		case r.Method == http.MethodPost && strings.Contains(r.URL.Path, "/pods"):
			w.WriteHeader(http.StatusCreated)
		case r.Method == http.MethodDelete && strings.Contains(r.URL.Path, "/nodes/"):
			w.WriteHeader(deleteNodeStatus)
		case r.Method == http.MethodDelete && strings.Contains(r.URL.Path, "/pods/"):
			w.WriteHeader(http.StatusOK)
		case r.Method == http.MethodGet && strings.Contains(r.URL.Path, "/pods/") && strings.HasSuffix(r.URL.Path, "/log"):
			_, _ = w.Write([]byte("remote logs"))
		case r.Method == http.MethodGet && strings.Contains(r.URL.Path, "/pods/"):
			podName := filepath.Base(r.URL.Path)
			phase, message := "Succeeded", "{}"
			switch {
			case strings.Contains(podName, "devices"):
				phase, message = devicePhase, deviceMessage
			case strings.Contains(podName, "build"):
				phase, message = buildPhase, buildMessage
			case strings.Contains(podName, "flash"):
				phase, message = flashPhase, flashMessage
			}
			_ = json.NewEncoder(w).Encode(map[string]any{
				"metadata": map[string]any{"name": podName},
				"status": map[string]any{
					"phase":   phase,
					"reason":  "Completed",
					"message": message,
				},
			})
		default:
			http.NotFound(w, r)
		}
	}))
}

func harborPruneFailureServer(t *testing.T) *httptest.Server {
	t.Helper()
	return httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case r.Method == http.MethodGet && strings.HasPrefix(r.URL.Path, "/api/v2.0/projects"):
			_ = json.NewEncoder(w).Encode([]map[string]string{{"name": "metis"}})
		case r.Method == http.MethodGet && strings.Contains(r.URL.Path, "/artifacts"):
			http.Error(w, "artifact list failed", http.StatusInternalServerError)
		default:
			http.NotFound(w, r)
		}
	}))
}

func defaultString(value, fallback string) string {
	if strings.TrimSpace(value) == "" {
		return fallback
	}
	return value
}