package main

import (
	"context"
	"encoding/json"
	"os"
	"strings"
	"testing"
	"time"

	"reasonix/internal/control"
)

func TestProjectTreeRuntimeSnapshotWailsArraysAreNonNil(t *testing.T) {
	snapshot := NewApp().GetProjectTreeRuntimeSnapshot()
	raw, err := json.Marshal(snapshot)
	if err != nil || snapshot.Topics == nil || !strings.Contains(string(raw), `"topics":[]`) {
		t.Fatalf("empty runtime snapshot = %s (%v), want non-nil topics:[]", raw, err)
	}
}

func TestProjectTreeRuntimeSnapshotLocalizesAutoTopicTitle(t *testing.T) {
	app := NewApp()
	app.setDesktopLocale("en-US")
	app.tabs["auto"] = &WorkspaceTab{
		ID: "auto", Scope: "global", TopicID: "topic-auto",
		TopicTitle: defaultTopicTitle, topicTitleSource: topicTitleSourceAuto,
	}

	snapshot := app.GetProjectTreeRuntimeSnapshot()
	if len(snapshot.Topics) != 1 || snapshot.Topics[0].Node.Label != defaultTopicTitleEn {
		t.Fatalf("runtime topic = %+v, want localized %q", snapshot.Topics, defaultTopicTitleEn)
	}
}

func TestProjectTreeRuntimeSnapshotFindsRestoredTabBeforeFirstEvent(t *testing.T) {
	app := NewApp()
	app.tabs["restored"] = &WorkspaceTab{
		ID: "restored", Scope: "project", WorkspaceRoot: "/workspace/restored",
		TopicID: "topic-restored", TopicTitle: "Restored task",
		SessionPath: "/sessions/restored.jsonl",
		Ctrl:        &activationStubController{sessionPath: "/sessions/restored.jsonl"},
		Ready:       true,
	}
	snapshot := app.GetProjectTreeRuntimeSnapshot()
	if snapshot.Revision != 0 || len(snapshot.Topics) != 1 {
		t.Fatalf("initial runtime snapshot = %+v, want one topic at revision 0", snapshot)
	}
	topic := snapshot.Topics[0]
	if topic.Node.TopicID != "topic-restored" || !topic.Node.Open || !topic.Node.Running {
		t.Fatalf("restored runtime topic = %+v, want open/running topic-restored", topic)
	}
}

func TestSyncProjectRootSpellingIncludesDetachedRuntime(t *testing.T) {
	isolateDesktopUserDirs(t)
	root := normalizeProjectRoot(t.TempDir())
	if err := addProject(root, "Project"); err != nil {
		t.Fatalf("add project: %v", err)
	}
	app := NewApp()
	app.detachedSessions["detached"] = &WorkspaceTab{
		Scope: "project", WorkspaceRoot: root + string(os.PathSeparator) + ".",
	}
	app.syncTabWorkspaceRootSpellings()
	if got := app.detachedSessions["detached"].WorkspaceRoot; got != root {
		t.Fatalf("detached runtime root = %q, want canonical %q", got, root)
	}
}

func TestKeepOnlyVisibleTabPublishesDetachedRuntimeProjection(t *testing.T) {
	isolateDesktopUserDirs(t)
	projectA := t.TempDir()
	projectB := t.TempDir()
	for _, dir := range []string{desktopSessionDir(projectA), desktopSessionDir(projectB)} {
		if err := os.MkdirAll(dir, 0o755); err != nil {
			t.Fatalf("mkdir session dir: %v", err)
		}
	}
	sessionA := writeTopicSessionWithPrompt(
		t,
		desktopSessionDir(projectA),
		"running-a.jsonl",
		"topic-a",
		"Running A",
		projectA,
		"keep working in project A",
		time.Now(),
	)
	sessionB := writeTopicSessionWithPrompt(
		t,
		desktopSessionDir(projectB),
		"visible-b.jsonl",
		"topic-b",
		"Visible B",
		projectB,
		"switch to project B",
		time.Now(),
	)

	app := NewApp()
	app.ctx = context.Background()
	broadCatalogRefreshes := 0
	app.projectTreeCatalogRefreshHook = func() { broadCatalogRefreshes++ }
	events := make(chan runtimeEventEnvelope, 8)
	app.runtimeEvents.emit = func(ctx context.Context, name string, payload ...any) {
		events <- runtimeEventEnvelope{ctx: ctx, name: name, payload: append([]any(nil), payload...)}
	}
	t.Cleanup(func() { app.shutdown(context.Background()) })

	runningCtrl := &activationStubController{sessionPath: sessionA}
	visibleCtrl := &activationStubController{sessionPath: sessionB, status: &control.RuntimeStatus{}}
	running := &WorkspaceTab{
		ID: "tab-a", Scope: "project", WorkspaceRoot: projectA,
		TopicID: "topic-a", TopicTitle: "Running A", SessionPath: sessionA,
		Ctrl: runningCtrl, Ready: true, disabledMCP: map[string]ServerView{},
	}
	visible := &WorkspaceTab{
		ID: "tab-b", Scope: "project", WorkspaceRoot: projectB,
		TopicID: "topic-b", TopicTitle: "Visible B", SessionPath: sessionB,
		Ctrl: visibleCtrl, Ready: true, disabledMCP: map[string]ServerView{},
	}
	running.sink = &tabEventSink{tabID: running.ID, app: app}
	visible.sink = &tabEventSink{tabID: visible.ID, app: app}
	app.tabs[running.ID] = running
	app.tabs[visible.ID] = visible
	app.tabOrder = []string{running.ID, visible.ID}
	app.activeTabID = running.ID

	if _, err := app.keepOnlyVisibleTab(visible.ID); err != nil {
		t.Fatalf("keepOnlyVisibleTab: %v", err)
	}
	if broadCatalogRefreshes != 0 {
		t.Fatalf("topic switch requested %d broad catalog refreshes, want runtime-only projection", broadCatalogRefreshes)
	}
	app.mu.RLock()
	detached := app.detachedSessions[sessionRuntimeKey(sessionA)]
	app.mu.RUnlock()
	if detached != running || runningCtrl.closed.Load() {
		t.Fatal("project A's running session was not preserved as a detached runtime")
	}

	deadline := time.After(time.Second)
	foundRuntime := false
	foundLegacy := false
	for {
		select {
		case emitted := <-events:
			switch emitted.name {
			case "project-tree:runtime-changed":
				if len(emitted.payload) != 1 {
					t.Fatalf("project-tree:runtime-changed payload count = %d, want 1", len(emitted.payload))
				}
				event, ok := emitted.payload[0].(ProjectTreeRuntimeSnapshot)
				if !ok {
					t.Fatalf("project-tree:runtime-changed payload type = %T, want ProjectTreeRuntimeSnapshot", emitted.payload[0])
				}
				if event.Topics == nil || event.Revision == 0 {
					t.Fatalf("project-tree:runtime-changed event = %+v, want a versioned runtime snapshot", event)
				}
				for _, topic := range event.Topics {
					if topic.Scope == "project" && sameProjectRoot(topic.WorkspaceRoot, projectA) && topic.Node.TopicID == "topic-a" {
						foundRuntime = !topic.Node.Open && topic.Node.Running
					}
				}
			case "project-tree:changed":
				if len(emitted.payload) != 1 {
					t.Fatalf("legacy runtime invalidation payload = %#v, want one tagged payload", emitted.payload)
				}
				reason, ok := emitted.payload[0].(map[string]string)
				foundLegacy = ok && reason["reason"] == "runtime"
			}
			if foundRuntime && foundLegacy {
				return
			}
		case <-deadline:
			if !foundRuntime {
				t.Fatal("detaching project A emitted no runtime snapshot; the running conversation stays invisible")
			}
			if !foundLegacy {
				t.Fatal("detaching project A emitted an untagged or missing compatibility invalidation")
			}
		}
	}
}

func TestProjectTreeCatalogV2CompatibilityEventIsTagged(t *testing.T) {
	app := NewApp()
	app.ctx = context.Background()
	events := make(chan runtimeEventEnvelope, 2)
	app.runtimeEvents.emit = func(ctx context.Context, name string, payload ...any) {
		events <- runtimeEventEnvelope{ctx: ctx, name: name, payload: append([]any(nil), payload...)}
	}

	app.emitProjectTreeChangedV2(7, nil, "metadata")
	first := <-events
	second := <-events
	if first.name != "project-tree:changed-v2" || second.name != "project-tree:changed" {
		t.Fatalf("catalog events = %#v, %#v, want v2 followed by compatibility event", first, second)
	}
	reason, ok := second.payload[0].(map[string]string)
	if !ok || reason["reason"] != "catalog-v2" {
		t.Fatalf("catalog compatibility payload = %#v, want reason catalog-v2", second.payload)
	}
}

func TestOpenProjectTabPublishesTaggedRuntimeInvalidation(t *testing.T) {
	isolateDesktopUserDirs(t)
	app := NewApp()
	app.ctx = context.Background()
	t.Cleanup(func() { app.shutdown(context.Background()) })
	events := make(chan runtimeEventEnvelope, 8)
	app.runtimeEvents.emit = func(ctx context.Context, name string, payload ...any) {
		events <- runtimeEventEnvelope{ctx: ctx, name: name, payload: append([]any(nil), payload...)}
	}
	projectRoot := t.TempDir()
	topic, err := app.CreateTopic("project", projectRoot, "Stable row")
	if err != nil {
		t.Fatalf("CreateTopic: %v", err)
	}

	if _, err := app.OpenProjectTab(projectRoot, topic.ID); err != nil {
		t.Fatalf("OpenProjectTab: %v", err)
	}
	deadline := time.After(time.Second)
	for {
		select {
		case event := <-events:
			if event.name != "project-tree:changed" {
				continue
			}
			if len(event.payload) != 1 {
				continue
			}
			reason, ok := event.payload[0].(map[string]string)
			if !ok || reason["reason"] != "runtime" {
				continue
			}
			return
		case <-deadline:
			t.Fatal("opening a project topic emitted no tagged runtime invalidation")
		}
	}
}