package http

import (
	"context"
	stdhttp "net/http"
	"strings"
	"testing"
	"time"

	"gitea.dcglab.co.uk/steve/restic-manager/internal/store"
)

func getTrend(t *testing.T, baseURL, hostID, rangeKey string, cookie *stdhttp.Cookie) string {
	t.Helper()
	client := &stdhttp.Client{
		CheckRedirect: func(_ *stdhttp.Request, _ []*stdhttp.Request) error {
			return stdhttp.ErrUseLastResponse
		},
	}
	url := baseURL + "/hosts/" + hostID + "/repo/trend"
	if rangeKey != "" {
		url += "?range=" + rangeKey
	}
	req, err := stdhttp.NewRequest("GET", url, nil)
	if err != nil {
		t.Fatalf("new request: %v", err)
	}
	req.AddCookie(cookie)
	res, err := client.Do(req)
	if err != nil {
		t.Fatalf("GET %s: %v", url, err)
	}
	defer res.Body.Close()
	if res.StatusCode != stdhttp.StatusOK {
		t.Fatalf("GET %s: want 200, got %d", url, res.StatusCode)
	}
	body := make([]byte, 0, 1<<20)
	buf := make([]byte, 4096)
	for {
		n, rerr := res.Body.Read(buf)
		body = append(body, buf[:n]...)
		if rerr != nil {
			break
		}
	}
	return string(body)
}

func TestUIRepoTrend_30dRange(t *testing.T) {
	t.Parallel()
	_, baseURL, st := newTestServerWithUI(t)
	cookie := loginAsAdmin(t, st)
	hostID := makeHost(t, st, "h-trend")
	ctx := context.Background()

	now := time.Now().UTC()
	for i := 0; i < 5; i++ {
		day := now.AddDate(0, 0, -i).Format("2006-01-02")
		v := int64(1000 + i*100)
		c := int64(10 + i)
		if err := st.UpsertHostRepoStatsHistory(ctx, hostID, day,
			store.HostRepoStats{TotalSizeBytes: &v, SnapshotCount: &c}, now); err != nil {
			t.Fatalf("seed %s: %v", day, err)
		}
	}

	body := getTrend(t, baseURL, hostID, "30d", cookie)
	if !strings.Contains(body, `class="repo-trend-chart"`) {
		t.Errorf("expected repo-trend-chart SVG in fragment")
	}
	if !strings.Contains(body, `id="repo-trend-chart"`) {
		t.Errorf("expected outer wrapper id=repo-trend-chart")
	}
	if !strings.Contains(body, `data-range="30d"`) {
		t.Errorf("expected data-range=30d")
	}
}

func TestUIRepoTrend_InvalidRangeFallsBackTo30d(t *testing.T) {
	t.Parallel()
	_, baseURL, st := newTestServerWithUI(t)
	cookie := loginAsAdmin(t, st)
	hostID := makeHost(t, st, "h-trend2")

	body := getTrend(t, baseURL, hostID, "banana", cookie)
	if !strings.Contains(body, `data-range="30d"`) {
		t.Errorf("expected data-range=30d on invalid range fallback")
	}
}

// TestUIRepoPageRendersTrendPanel — full-page render path: seed 3
// history rows, fetch /hosts/{id}/repo, assert the Trend panel with
// SVG chart ID, class, and heading text appear embedded in the page.
func TestUIRepoPageRendersTrendPanel(t *testing.T) {
	t.Parallel()
	_, baseURL, st := newTestServerWithUI(t)
	cookie := loginAsAdmin(t, st)
	hostID := makeHost(t, st, "h-trend-page")
	ctx := context.Background()

	now := time.Now().UTC()
	for i := 0; i < 3; i++ {
		day := now.AddDate(0, 0, -i).Format("2006-01-02")
		v := int64(2000 + i*200)
		c := int64(20 + i)
		if err := st.UpsertHostRepoStatsHistory(ctx, hostID, day,
			store.HostRepoStats{TotalSizeBytes: &v, SnapshotCount: &c}, now); err != nil {
			t.Fatalf("seed %s: %v", day, err)
		}
	}

	body := getRepoPage(t, baseURL, hostID, cookie)

	if !strings.Contains(body, `id="repo-trend-chart"`) {
		t.Errorf("expected id=\"repo-trend-chart\" in full-page render")
	}
	if !strings.Contains(body, `class="repo-trend-chart"`) {
		t.Errorf("expected class=\"repo-trend-chart\" in full-page render")
	}
	if !strings.Contains(body, ">Trend<") {
		t.Errorf("expected panel heading '>Trend<' in full-page render")
	}
}