package supervisor

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

func makeTestData(allPassed bool) (Task, RunResult, VerifyResult) {
	task := Task{
		ID:          "T07",
		Title:       "Test feature",
		Agent:       "coder",
		Model:       "Sonnet",
		Description: "Implement test feature.",
	}

	run := RunResult{
		TaskID:     "T07",
		StartedAt:  time.Date(2026, 2, 20, 10, 15, 0, 0, time.UTC),
		FinishedAt: time.Date(2026, 2, 20, 10, 23, 45, 0, time.UTC),
		Duration:   8*time.Minute + 45*time.Second,
		ExitCode:   0,
		Output:     "Task completed successfully.\nAll tests passed.",
	}

	verify := VerifyResult{
		Build: CheckResult{
			Name: "build", Status: "pass",
			Duration: 300 * time.Millisecond,
		},
		Vet: CheckResult{
			Name: "vet", Status: "pass",
			Duration: 200 * time.Millisecond,
		},
		Test: CheckResult{
			Name: "test", Status: "pass",
			Duration:  2100 * time.Millisecond,
			TestCount: 12,
		},
		AllPassed: allPassed,
	}

	if !allPassed {
		verify.Test.Status = "fail"
		run.ExitCode = 1
	}

	return task, run, verify
}

func TestWriteReport_CreatesFile(t *testing.T) {
	dir := t.TempDir()
	reportsDir := filepath.Join(dir, "reports")

	task, run, verify := makeTestData(true)

	path, err := WriteReport(task, run, verify, reportsDir)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if _, err := os.Stat(path); err != nil {
		t.Fatalf("report file not found: %v", err)
	}

	expectedFilename := "T07-report.md"
	if filepath.Base(path) != expectedFilename {
		t.Errorf("expected filename %s, got %s", expectedFilename, filepath.Base(path))
	}
}

func TestWriteReport_Content(t *testing.T) {
	dir := t.TempDir()
	task, run, verify := makeTestData(true)

	path, err := WriteReport(task, run, verify, dir)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	data, err := os.ReadFile(path)
	if err != nil {
		t.Fatalf("read report: %v", err)
	}
	content := string(data)

	checks := []struct {
		name    string
		substr  string
	}{
		{"header", "# T07: Test feature"},
		{"date format", "2026-02-20 10:15"},
		{"duration", "8m 45s"},
		{"status passed", "✅ Završen"},
		{"build check", "✅ build"},
		{"vet check", "✅ vet"},
		{"test count", "12 testova"},
		{"agent output section", "## Agent output"},
		{"output content", "Task completed successfully"},
	}

	for _, c := range checks {
		if !strings.Contains(content, c.substr) {
			t.Errorf("%s: expected %q in report, got:\n%s", c.name, c.substr, content)
		}
	}
}

func TestWriteReport_FailedStatus(t *testing.T) {
	dir := t.TempDir()
	task, run, verify := makeTestData(false)

	path, err := WriteReport(task, run, verify, dir)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	data, _ := os.ReadFile(path)
	content := string(data)

	if !strings.Contains(content, "❌ Neuspešan") {
		t.Errorf("expected '❌ Neuspešan' in report, got:\n%s", content)
	}
	if !strings.Contains(content, "❌ test") {
		t.Errorf("expected '❌ test' in report, got:\n%s", content)
	}
}

func TestWriteReport_CreatesDirectory(t *testing.T) {
	dir := t.TempDir()
	reportsDir := filepath.Join(dir, "deep", "nested", "reports")

	task, run, verify := makeTestData(true)

	path, err := WriteReport(task, run, verify, reportsDir)
	if err != nil {
		t.Fatalf("unexpected error: %v", err)
	}

	if _, err := os.Stat(path); err != nil {
		t.Fatalf("report file not found: %v", err)
	}
}

func TestTruncateOutput_Short(t *testing.T) {
	output := "line1\nline2\nline3\n"
	result := truncateOutput(output, 50)

	if strings.Contains(result, "skraćeno") {
		t.Error("should not truncate short output")
	}
	if !strings.Contains(result, "line1") {
		t.Error("expected all lines present")
	}
}

func TestTruncateOutput_Long(t *testing.T) {
	var lines []string
	for i := 1; i <= 80; i++ {
		lines = append(lines, "line "+string(rune('0'+i/10))+string(rune('0'+i%10)))
	}
	output := strings.Join(lines, "\n")

	result := truncateOutput(output, 50)

	if !strings.Contains(result, "skraćeno") {
		t.Error("expected truncation marker")
	}
	if !strings.Contains(result, "poslednjih 50 od 80") {
		t.Errorf("expected 'poslednjih 50 od 80' in: %s", result)
	}
	// First lines should be gone
	if strings.Contains(result, "line 01") {
		t.Error("expected first lines to be removed")
	}
}

func TestTruncateOutput_Empty(t *testing.T) {
	result := truncateOutput("", 50)
	if !strings.Contains(result, "nema outputa") {
		t.Errorf("expected 'nema outputa', got: %s", result)
	}
}

func TestFormatDuration_Minutes(t *testing.T) {
	d := 8*time.Minute + 45*time.Second
	result := formatDuration(d)
	if result != "8m 45s" {
		t.Errorf("expected '8m 45s', got %q", result)
	}
}

func TestFormatDuration_SecondsOnly(t *testing.T) {
	d := 45 * time.Second
	result := formatDuration(d)
	if result != "45s" {
		t.Errorf("expected '45s', got %q", result)
	}
}

func TestFormatDuration_Zero(t *testing.T) {
	result := formatDuration(0)
	if result != "0s" {
		t.Errorf("expected '0s', got %q", result)
	}
}