package export

import (
	"encoding/json"
	"os"
	"path/filepath"
	"testing"
)

// Note: model.Issue fields are not validated here; this test ensures the writer
// creates valid JSON and writes atomically into place.
func TestWriteIssues_WritesIndentedJSON(t *testing.T) {
	t.Parallel()

	wd, err := os.Getwd()
	if err != nil {
		t.Fatalf("get working dir: %v", err)
	}
	testDir := filepath.Join(wd, "testdata", t.Name())
	if err := os.MkdirAll(testDir, 0o755); err != nil {
		t.Fatalf("create test dir: %v", err)
	}
	defer os.RemoveAll(testDir)
	outPath := filepath.Join("testdata", t.Name(), "issues.json")

	// Use an empty slice to avoid depending on model.Issue definition.
	if err := WriteIssues(outPath, nil); err != nil {
		t.Fatalf("WriteIssues error: %v", err)
	}

	b, err := os.ReadFile(outPath)
	if err != nil {
		t.Fatalf("read file: %v", err)
	}

	// Ensure valid JSON.
	var v any
	if err := json.Unmarshal(b, &v); err != nil {
		t.Fatalf("invalid json: %v\ncontent=%s", err, string(b))
	}

	// encoding/json.Encoder.Encode adds a trailing newline; and SetIndent should
	// produce multi-line output for arrays/objects.
	if len(b) == 0 || b[len(b)-1] != '\n' {
		t.Fatalf("expected trailing newline")
	}
}