package writeback

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"ukrrs.com/mopac/harness/internal/task"
)

func TestWriteProducesReportAndLatest(t *testing.T) {
	dir := t.TempDir()
	r := Report{
		Time:             time.Date(2026, 8, 28, 19, 41, 2, 0, time.UTC),
		Vertical:         "demo-stack",
		Task:             task.Task{ID: "demo-1", Subject: "MVP demo", Prompt: "tell me about yourself", Class: "primary", Source: "demo"},
		Class:            "primary",
		Tier:             "mopac-primary",
		Model:            "glm-5.3",
		PromptTokens:     12,
		CompletionTokens: 340,
		TotalTokens:      352,
		Rounds:           1,
		StopReason:       "complete",
		Duration:         2 * time.Second,
		Content:          "I am GLM, a large language model.",
	}
	path, err := Write(dir, r)
	if err != nil {
		t.Fatalf("Write: %v", err)
	}
	want := filepath.Join(dir, "REPORT-demo-stack-demo-1-20260828-194102.md")
	if path != want {
		t.Errorf("path = %s, want %s", path, want)
	}
	body, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	s := string(body)
	for _, want := range []string{
		"model: glm-5.3 (tier mopac-primary, class primary)",
		"usage: prompt=12 completion=340 total=352 tokens",
		"rounds=1",
		"## Result",
		"I am GLM, a large language model.",
	} {
		if !strings.Contains(s, want) {
			t.Errorf("REPORT missing %q", want)
		}
	}
	latest, err := os.ReadFile(filepath.Join(dir, "REPORT-latest.md"))
	if err != nil || len(latest) != len(body) {
		t.Errorf("REPORT-latest.md missing or stale (err=%v)", err)
	}
	// No .tmp litter.
	entries, _ := os.ReadDir(dir)
	for _, e := range entries {
		if strings.HasSuffix(e.Name(), ".tmp") {
			t.Errorf("tmp file left behind: %s", e.Name())
		}
	}
}

func TestSanitize(t *testing.T) {
	if got := sanitize("a/b c"); got != "a-b-c" {
		t.Errorf("sanitize = %q", got)
	}
}

func TestEmptyContentPlaceholder(t *testing.T) {
	r := Report{Time: time.Now(), Vertical: "v", Task: task.Task{ID: "x"}, Content: ""}
	if !strings.Contains(r.Render(), "(no content produced)") {
		t.Errorf("empty content should render a placeholder")
	}
}