package web

import (
	"fmt"
	"net/http"
	"strings"
	"testing"
	"time"

	"gitea.lab.audasmedia.com.au/sam/internet_use_control/internal/store"
)

func TestUsageScreenShowsAWeek(t *testing.T) {
	app := newTestApp(t)
	dev := createTestDevice(t, app)
	ctx := t.Context()

	// Seed the whole current week: apps and domains for every day.
	start := weekStart(time.Now())
	for i := 0; i < 7; i++ {
		day := start.AddDate(0, 0, i).Format("2006-01-02")
		if _, err := app.store.InsertTelemetry(ctx, dev.ID, day, []store.TelemetryEntry{
			{App: "com.roblox.client", Seconds: (i + 1) * 600},
			{App: "com.spotify.music", Seconds: 300},
			{Domain: "roblox.com", Seconds: (i + 1) * 600},
		}); err != nil {
			t.Fatalf("InsertTelemetry %s: %v", day, err)
		}
	}

	rec := app.do(t, http.MethodGet, fmt.Sprintf("/devices/%d/usage", dev.ID), nil)
	if rec.Code != http.StatusOK {
		t.Fatalf("GET usage = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	body := rec.Body.String()
	for _, want := range []string{
		"Usage", "Top apps", "Top sites", "App time", "Site time",
		"com.roblox.client", "com.spotify.music", "roblox.com",
		fmt.Sprintf("%d", dev.ID), "Harry&#39;s Pixel",
	} {
		if !strings.Contains(body, want) {
			t.Errorf("usage page missing %q", want)
		}
	}
	// Seven day rows: the weekday abbreviations must all be present.
	for _, wd := range []string{"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"} {
		if !strings.Contains(body, ">"+wd+" <") {
			t.Errorf("usage page missing the %s row", wd)
		}
	}

	// A week with no data renders the empty state, never an error.
	rec = app.do(t, http.MethodGet,
		fmt.Sprintf("/devices/%d/usage?week=2020-01-01", dev.ID), nil)
	if rec.Code != http.StatusOK || !strings.Contains(rec.Body.String(), "No usage for this week") {
		t.Errorf("empty week = %d, want the empty state", rec.Code)
	}
}

func TestWeekHelpers(t *testing.T) {
	loc := time.UTC
	// A Sunday belongs to the week that started the previous Monday.
	sunday := time.Date(2026, 10, 18, 12, 0, 0, 0, loc) // Sunday
	got := weekStart(sunday)
	want := time.Date(2026, 10, 12, 0, 0, 0, 0, loc)
	if !got.Equal(want) {
		t.Errorf("weekStart(Sun) = %s, want %s", got, want)
	}

	// A bad ?week= value falls back to now instead of failing.
	now := time.Date(2026, 10, 15, 9, 0, 0, 0, loc)
	if got := parseWeekAnchor("not-a-date", now); !got.Equal(now) {
		t.Errorf("parseWeekAnchor(bad) = %s, want now", got)
	}
	if got := parseWeekAnchor("2026-10-12", now); got.Day() != 12 || got.Month() != time.October {
		t.Errorf("parseWeekAnchor(valid) = %s", got)
	}

	if got := formatSeconds(0); got != "0m" {
		t.Errorf("formatSeconds(0) = %q", got)
	}
	if got := formatSeconds(3600); got != "1h 00m" {
		t.Errorf("formatSeconds(3600) = %q", got)
	}
	if got := formatSeconds(30); got != "under a minute" {
		t.Errorf("formatSeconds(30) = %q", got)
	}
	if got := percent(50, 100); got != 50 {
		t.Errorf("percent(50,100) = %d", got)
	}
	if got := percent(50, 0); got != 0 {
		t.Errorf("percent with max 0 = %d, want 0", got)
	}
}