package native

import (
	"context"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"testing"

	"agent-native/exec"
	"agent-native/runtime/llm"
)

// script 按序回放假助手轮次（对齐 runtime/loop_test 的伪造方式）。
func script(turns ...llm.Message) llm.StreamFunc {
	var mu sync.Mutex
	i := 0
	return func(ctx context.Context, model string, messages []llm.Message, tools []llm.ToolDecl, opts llm.StreamOptions) <-chan llm.Event {
		ch := make(chan llm.Event, 4)
		go func() {
			defer close(ch)
			mu.Lock()
			defer mu.Unlock()
			if i >= len(turns) {
				ch <- llm.Event{Kind: llm.KindMessageEnd, Message: llm.Message{Role: llm.RoleAssistant, Content: "done", StopReason: llm.StopEnd}}
				return
			}
			msg := turns[i]
			i++
			if msg.Content != "" {
				ch <- llm.Event{Kind: llm.KindTextDelta, Text: msg.Content}
			}
			ch <- llm.Event{Kind: llm.KindMessageEnd, Message: msg}
		}()
		return ch
	}
}

func TestBackendWorkspaceProfileWritesDeliverable(t *testing.T) {
	dir := t.TempDir()
	b := New(Options{
		ModelOptions: ModelOptions{
			Model: "fake",
			Stream: script(
				llm.Message{Role: llm.RoleAssistant, StopReason: llm.StopToolCalls, ToolCalls: []llm.ToolCall{{
					ID: "c1", Name: "write_file", Arguments: `{"path":"output.md","content":"# 交付\n\n工具写入的交付物内容。"}`,
				}}},
				llm.Message{Role: llm.RoleAssistant, Content: "已写入 output.md", StopReason: llm.StopEnd},
			),
		},
	})
	var events []exec.ProcessEvent
	res, err := b.Execute(context.Background(), exec.Request{
		WorkDir: dir, Prompt: "写交付物", Instructions: "你是测试角色",
		Targets: []string{"output.md"}, OnEvent: func(ev exec.ProcessEvent) { events = append(events, ev) },
	})
	if err != nil {
		t.Fatal(err)
	}
	if !res.Success {
		t.Fatalf("want success, got %+v", res)
	}
	data, err := os.ReadFile(filepath.Join(dir, "output.md"))
	if err != nil || !strings.Contains(string(data), "交付物内容") {
		t.Fatalf("deliverable missing: %v %q", err, data)
	}
	if res.Patches["output.md"] == nil {
		t.Fatal("patches missing output.md")
	}
	for _, f := range []string{"TASK.md", "AGENTS.md", "INSTRUCTIONS.md", "execution.log"} {
		if _, err := os.Stat(filepath.Join(dir, f)); err != nil {
			t.Errorf("workspace file missing: %s", f)
		}
	}
	sawTool := false
	for _, ev := range events {
		if ev.Type == "tool_execution_start" && ev.Tool == "write_file" {
			sawTool = true
		}
	}
	if !sawTool {
		t.Errorf("tool process events not forwarded: %+v", events)
	}
}

func TestBackendReasoningProfileWritesText(t *testing.T) {
	dir := t.TempDir()
	b := New(Options{
		ModelOptions: ModelOptions{
			Model: "fake",
			Stream: script(
				llm.Message{Role: llm.RoleAssistant, Content: "纯文本交付内容（无工具）。", StopReason: llm.StopEnd},
			),
		},
	})
	res, err := b.Execute(context.Background(), exec.Request{
		WorkDir: dir, Prompt: "直接回答", ToolProfile: exec.ToolProfileReasoning,
		Targets: []string{"notes.md"},
	})
	if err != nil {
		t.Fatal(err)
	}
	if !res.Success {
		t.Fatalf("want success, got %+v", res)
	}
	data, _ := os.ReadFile(filepath.Join(dir, "notes.md"))
	if !strings.Contains(string(data), "纯文本交付内容") {
		t.Fatalf("reasoning text not written: %q", data)
	}
}

func TestBackendFailClosedWithoutConfig(t *testing.T) {
	b := New(Options{})
	res, err := b.Execute(context.Background(), exec.Request{WorkDir: t.TempDir(), Targets: []string{"x.md"}})
	if err != nil {
		t.Fatal(err)
	}
	if res.Success || !strings.Contains(res.ErrorReason, "requires") {
		t.Fatalf("want fail-closed config error, got %+v", res)
	}
	res2, _ := New(Options{
		ModelOptions: ModelOptions{
			APIBase: "http://x",
			APIKey:  "k",
		},
	}).Execute(context.Background(),
		exec.Request{WorkDir: t.TempDir(), Targets: []string{"x.md"}})
	if res2.Success || !strings.Contains(res2.ErrorReason, "model") {
		t.Fatalf("want model required error, got %+v", res2)
	}
	res3, _ := New(Options{
		ModelOptions: ModelOptions{
			Stream: script(),
		},
	}).Execute(context.Background(),
		exec.Request{WorkDir: t.TempDir(), Targets: []string{"x.md"}, ToolProfile: "bogus"})
	if res3.Success || !strings.Contains(res3.ErrorReason, "tool profile") {
		t.Fatalf("want profile error, got %+v", res3)
	}
}