package render

import (
	"bytes"
	"encoding/json"
	"errors"
	"os"
	"path/filepath"
	"regexp"
	"strings"
	"testing"

	"github.com/kotoyuuko/zenmux-usage-cli/internal/api"
)

var ansiRE = regexp.MustCompile(`\x1b\[[0-9;]*m`)

func stripANSI(s string) string { return ansiRE.ReplaceAllString(s, "") }

func loadSample(t *testing.T) *api.Response {
	t.Helper()
	data, err := os.ReadFile(filepath.Join("..", "api", "testdata", "sample.json"))
	if err != nil {
		t.Fatalf("read sample: %v", err)
	}
	var r api.Response
	if err := json.Unmarshal(data, &r); err != nil {
		t.Fatalf("parse sample: %v", err)
	}
	return &r
}

func TestProgressBar(t *testing.T) {
	cases := []struct {
		pct   float64
		want  string
	}{
		{0, strings.Repeat(barEmpty, barWidth)},
		{1, strings.Repeat(barFilled, barWidth)},
		{0.5, strings.Repeat(barFilled, 15) + strings.Repeat(barEmpty, 15)},
		{-0.1, strings.Repeat(barEmpty, barWidth)},
		{1.5, strings.Repeat(barFilled, barWidth)},
	}
	for _, tc := range cases {
		got := ProgressBar(tc.pct, barWidth)
		if got != tc.want {
			t.Errorf("ProgressBar(%v) got %q want %q", tc.pct, got, tc.want)
		}
	}
}

func TestBandColor(t *testing.T) {
	cases := []struct {
		pct  float64
		want string
	}{
		{0.10, "green"},
		{0.59, "green"},
		{0.60, "yellow"},
		{0.85, "yellow"},
		{0.86, "red"},
		{1.00, "red"},
	}
	for _, tc := range cases {
		attr := BandColor(tc.pct)
		var got string
		switch attr {
		case 32: // FgGreen
			got = "green"
		case 33: // FgYellow
			got = "yellow"
		case 31: // FgRed
			got = "red"
		}
		if got != tc.want {
			t.Errorf("BandColor(%v) got %s want %s", tc.pct, got, tc.want)
		}
	}
}

func TestRenderAccount_Snapshot(t *testing.T) {
	resp := loadSample(t)
	var buf bytes.Buffer
	setGlobalColor(false)
	RenderAccount(&buf, "personal", resp, false)

	got := stripANSI(buf.String())
	wants := []string{
		"━━━ personal ━━━",
		"Ultra plan ($200/mo)",
		"healthy",
		"$0.03283/flow",
		"5 hour",
		"7 day",
		"month",
		"7.15%",
		"6.73%",
		" n/a",
		"57.2 / 800 flows",
		"416.11 / 6182 flows",
		"— / 34560 flows",
		"$1.88 / $26.26",
		"— / $1134.33",
		"Tokens consumed (estimated USD value): $13.66",
	}
	for _, w := range wants {
		if !strings.Contains(got, w) {
			t.Errorf("output missing %q\n---\n%s\n---", w, got)
		}
	}
}

func TestRenderAll_MultiAccountWithError(t *testing.T) {
	resp := loadSample(t)
	results := []AccountResult{
		{Name: "personal", Response: resp},
		{Name: "work", Err: errors.New("authentication rejected: HTTP 401")},
	}
	var buf bytes.Buffer
	RenderAll(&buf, results, false)
	got := stripANSI(buf.String())

	if !strings.Contains(got, "━━━ personal ━━━") {
		t.Error("missing personal header")
	}
	if !strings.Contains(got, "━━━ work ━━━") {
		t.Error("missing work header")
	}
	if !strings.Contains(got, "error: authentication rejected") {
		t.Error("missing error line for work account")
	}
	// Personal block comes before work block.
	pIdx := strings.Index(got, "personal")
	wIdx := strings.Index(got, "work")
	if pIdx < 0 || wIdx < 0 || pIdx >= wIdx {
		t.Errorf("account ordering wrong: personal@%d work@%d", pIdx, wIdx)
	}
}

func TestRenderAccount_UsesColorWhenEnabled(t *testing.T) {
	resp := loadSample(t)
	var buf bytes.Buffer
	setGlobalColor(true)
	defer setGlobalColor(false)
	RenderAccount(&buf, "personal", resp, true)
	if !ansiRE.MatchString(buf.String()) {
		t.Error("expected ANSI escape sequences when useColor=true")
	}
}

func TestRenderAccount_NoColorWhenDisabled(t *testing.T) {
	resp := loadSample(t)
	var buf bytes.Buffer
	setGlobalColor(false)
	RenderAccount(&buf, "personal", resp, false)
	if ansiRE.MatchString(buf.String()) {
		t.Errorf("expected no ANSI when useColor=false, got %q", buf.String())
	}
}

func TestBandColor_HighUsageRed(t *testing.T) {
	// Sanity: a 90% usage window should render with a red bar/percent.
	resp := &api.Response{
		Success: true,
		Data: api.Data{
			Plan:                api.Plan{Tier: "pro", AmountUSD: 50},
			AccountStatus:       "healthy",
			EffectiveUSDPerFlow: 0.01,
			Quota5Hour: api.QuotaWindow{
				UsagePercentage: 0.92, MaxFlows: 100, UsedFlows: 92,
				UsedValueUSD: 0.92, MaxValueUSD: 1.00,
			},
			Quota7Day: api.QuotaWindow{
				UsagePercentage: 0.70, MaxFlows: 1000, UsedFlows: 700,
				UsedValueUSD: 7.00, MaxValueUSD: 10.00,
			},
			QuotaMonthly: api.QuotaMonthly{MaxFlows: 4000, MaxValueUSD: 40},
		},
	}
	var buf bytes.Buffer
	setGlobalColor(true)
	defer setGlobalColor(false)
	RenderAccount(&buf, "n", resp, true)
	out := buf.String()
	// 31 = FgRed, 33 = FgYellow. Both should appear.
	if !strings.Contains(out, "\x1b[31m") {
		t.Error("expected red ANSI somewhere in output for 92% bar")
	}
	if !strings.Contains(out, "\x1b[33m") {
		t.Error("expected yellow ANSI somewhere in output for 70% bar")
	}
}