package logic

import (
	"context"
	"testing"
	"time"

	"img_infinite_canvas/internal/application"
	"img_infinite_canvas/internal/domain/design"
	"img_infinite_canvas/internal/infrastructure/memory"
	"img_infinite_canvas/internal/svc"
	"img_infinite_canvas/internal/types"
)

func TestProjectEventsFiltersMessagesByThreadID(t *testing.T) {
	ctx := context.Background()
	repo := memory.NewProjectRepository()
	project := design.Project{
		ID:        "project-events",
		Title:     "Events",
		Status:    design.StatusReady,
		UpdatedAt: time.Now(),
		Messages: []design.Message{
			{ID: "a", Role: "tool", Type: "tool", Title: "A", Content: "thread-a", ThreadID: "thread-a", CreatedAt: time.Now()},
			{ID: "b", Role: "tool", Type: "tool", Title: "B", Content: "thread-b", ThreadID: "thread-b", CreatedAt: time.Now()},
		},
	}
	if err := repo.Save(ctx, project); err != nil {
		t.Fatal(err)
	}

	logic := NewProjectEventsLogic(ctx, &svc.ServiceContext{
		DesignService: application.NewDesignService(repo, nil, nil, nil, nil),
	})
	var thinking []types.AgentMessage
	err := logic.Stream(&types.ProjectIdRequest{Id: project.ID}, "thread-b", func(event string, payload any) error {
		if event == "thinking" {
			thinking = append(thinking, payload.(types.AgentMessage))
		}
		return nil
	})
	if err != nil {
		t.Fatal(err)
	}
	if len(thinking) != 1 || thinking[0].Id != "b" {
		t.Fatalf("expected only thread-b message, got %#v", thinking)
	}
}

func TestMessageEventStateThrottlesStreamingMessages(t *testing.T) {
	now := time.Now()
	state := newMessageEventState()
	message := design.Message{ID: "streaming", Role: "assistant", Type: "assistant", Content: "a", Status: "running", CreatedAt: now}
	if !state.shouldEmit(message, now) {
		t.Fatal("expected first streaming message to emit")
	}
	message.Content = "ab"
	if state.shouldEmit(message, now.Add(100*time.Millisecond)) {
		t.Fatal("expected rapid streaming update to be throttled")
	}
	message.Content = "abc"
	if !state.shouldEmit(message, now.Add(streamingThinkingThrottle+time.Millisecond)) {
		t.Fatal("expected streaming update after throttle window to emit")
	}
	message.Content = "abcd"
	message.Status = "success"
	if !state.shouldEmit(message, now.Add(streamingThinkingThrottle+2*time.Millisecond)) {
		t.Fatal("expected final message status to emit immediately")
	}
}

func TestProjectThreadStateFinishesMockupToolThread(t *testing.T) {
	started, finished, failed := projectThreadState([]design.Message{
		{ID: "m1", Role: "tool", Type: "tool", Name: "mockup_model", ToolHint: "mockup_model", ThreadID: "thread-mockup", Status: "running"},
		{ID: "m2", Role: "tool", Type: "tool", Name: "mockup_model", ToolHint: "mockup_model", ThreadID: "thread-mockup", Status: "success"},
	}, "thread-mockup")
	if !started || !finished || failed {
		t.Fatalf("expected completed mockup tool thread, got started=%v finished=%v failed=%v", started, finished, failed)
	}
}

func TestProjectThreadStateWaitsForRunningGenerationTool(t *testing.T) {
	started, finished, failed := projectThreadState([]design.Message{
		{ID: "tool", Role: "tool", Type: "tool", Title: "GPT Image 2", ThreadID: "thread-image", Status: "running"},
		{ID: "assistant", Role: "assistant", Type: "assistant", Title: "猫主题视觉图", Content: "已生成。", ThreadID: "thread-image", Status: "success"},
	}, "thread-image")
	if !started || finished || failed {
		t.Fatalf("expected running generation tool to keep thread open, got started=%v finished=%v failed=%v", started, finished, failed)
	}
}

func TestProjectThreadStateFinishesAfterGenerationToolSucceeds(t *testing.T) {
	started, finished, failed := projectThreadState([]design.Message{
		{ID: "tool-running", Role: "tool", Type: "tool", Title: "GPT Image 2", ThreadID: "thread-image", Status: "running"},
		{ID: "tool-success", Role: "tool", Type: "tool", Title: "GPT Image 2", ThreadID: "thread-image", Status: "success"},
		{ID: "assistant", Role: "assistant", Type: "assistant", Title: "猫主题视觉图", Content: "已生成。", ThreadID: "thread-image", Status: "success"},
	}, "thread-image")
	if !started || !finished || failed {
		t.Fatalf("expected completed generation thread, got started=%v finished=%v failed=%v", started, finished, failed)
	}
}

func TestProjectEventFingerprintIgnoresMessageOnlyChanges(t *testing.T) {
	now := time.Now()
	project := design.Project{
		ID:        "project-events-fingerprint",
		Title:     "Events",
		Status:    design.StatusExploring,
		UpdatedAt: now,
		Messages: []design.Message{
			{ID: "m", Role: "assistant", Type: "assistant", Content: "a", Status: "running", CreatedAt: now},
		},
	}
	before := projectEventFingerprint(project)
	project.UpdatedAt = now.Add(time.Second)
	project.Version = "next"
	project.SnapshotID = "snapshot"
	project.Messages[0].Content = "streamed content"
	after := projectEventFingerprint(project)
	if before != after {
		t.Fatal("expected message-only save to keep project event fingerprint stable")
	}
	project.Nodes = append(project.Nodes, design.Node{ID: "n", Type: design.NodeTypeImage, Status: "generating"})
	if before == projectEventFingerprint(project) {
		t.Fatal("expected canvas node changes to update project event fingerprint")
	}
}