package ui

import (
	"bytes"
	"strings"
	"testing"
	"time"
)

func newTestWriter(color bool) (*Writer, *bytes.Buffer) {
	buf := &bytes.Buffer{}
	return NewWithColor(buf, color), buf
}

func TestMessageMethodsPlain(t *testing.T) {
	tests := []struct {
		method string
		fn     func(*Writer)
		want   string
	}{
		{"Begin", func(w *Writer) { w.Begin("starting %s", "thing") }, "》 starting thing\n"},
		{"Complete", func(w *Writer) { w.Complete("done %s", "thing") }, "》 done thing\n"},
		{"Info", func(w *Writer) { w.Info("status") }, "》 status\n"},
		{"Notice", func(w *Writer) { w.Notice("note") }, "》 note\n"},
		{"Warning", func(w *Writer) { w.Warning("oops") }, "⚠️  Warning: oops\n"},
		{"Error", func(w *Writer) { w.Error("boom") }, "🛑 ERROR: boom\n"},
		{"Progress", func(w *Writer) { w.Progress("p") }, "  》 p\n"},
		{"Detail", func(w *Writer) { w.Detail("d") }, "  》 d\n"},
		{"Banner", func(w *Writer) { w.Banner("hello") }, "hello\n"},
	}

	for _, tt := range tests {
		t.Run(tt.method, func(t *testing.T) {
			w, buf := newTestWriter(false)
			tt.fn(w)
			if got := buf.String(); got != tt.want {
				t.Errorf("got %q, want %q", got, tt.want)
			}
		})
	}
}

func TestWarningErrorCounters(t *testing.T) {
	w, _ := newTestWriter(false)
	if w.WarningCount() != 0 || w.ErrorCount() != 0 {
		t.Fatalf("expected fresh writer to have zero counts")
	}
	w.Info("normal")
	w.Warning("first warn")
	w.Warning("second warn")
	w.Error("only error")
	if got, want := w.WarningCount(), 2; got != want {
		t.Errorf("WarningCount: got %d, want %d", got, want)
	}
	if got, want := w.ErrorCount(), 1; got != want {
		t.Errorf("ErrorCount: got %d, want %d", got, want)
	}
}

func TestColorOutputContainsANSI(t *testing.T) {
	w, buf := newTestWriter(true)
	w.Error("boom")
	out := buf.String()
	if !strings.Contains(out, "\033[") {
		t.Errorf("expected ANSI escapes in color output, got %q", out)
	}
	if !strings.Contains(out, "ERROR: ") {
		t.Errorf("expected 'ERROR: ' text in output, got %q", out)
	}
}

func TestValueFormattersPlain(t *testing.T) {
	w, _ := newTestWriter(false)

	if got := w.Hex("0123456789abcdef0123"); got != "0123456789ab..." {
		t.Errorf("Hex long: got %q", got)
	}
	if got := w.Hex("short"); got != "short" {
		t.Errorf("Hex short: got %q", got)
	}
	if got := w.Size(1024); got != "1.0 kB" {
		t.Errorf("Size: got %q", got)
	}
	if got := w.Duration(90 * time.Second); got != "1m30s" {
		t.Errorf("Duration: got %q", got)
	}
	if got := w.Count(12345); got != "12,345" {
		t.Errorf("Count: got %q", got)
	}
	if got := w.Percent(12.34); got != "12.3%" {
		t.Errorf("Percent: got %q", got)
	}

	// Time format: today → HH:MM:SS, other day → YYYY-MM-DD HH:MM:SS.
	today := time.Date(time.Now().Year(), time.Now().Month(), time.Now().Day(), 14, 30, 45, 0, time.Local)
	if got := w.Time(today); got != "14:30:45" {
		t.Errorf("Time today: got %q, want 14:30:45", got)
	}
	other := time.Date(2030, 1, 2, 3, 4, 5, 0, time.Local)
	if got := w.Time(other); got != "2030-01-02 03:04:05" {
		t.Errorf("Time other day: got %q", got)
	}
}

func TestValueFormattersColored(t *testing.T) {
	w, _ := newTestWriter(true)
	hex := w.Hex("0123456789abcdef0123")
	if !strings.Contains(hex, "\033[") {
		t.Errorf("expected ANSI in colored Hex output, got %q", hex)
	}
	if !strings.Contains(hex, "0123456789ab") {
		t.Errorf("expected hex content in output, got %q", hex)
	}
}