package tasks

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

func stallNow() time.Time { return time.Date(2026, 8, 5, 12, 0, 0, 0, time.UTC) }

func TestStallsCountsTheThreeShapes(t *testing.T) {
	now := stallNow()
	day := 24 * time.Hour
	yesterday := now.Add(-day)
	items := []Item{
		// Overdue and sitting at once: it counts in both, because they are two
		// different things wrong with one task.
		{ID: 1, Text: "оплатить интернет", Status: StatusOpen, Created: now.Add(-20 * day), Due: &yesterday},
		{ID: 2, Text: "купить молоко", Status: StatusOpen, Created: now.Add(-12 * day)},
		{ID: 3, Text: "позвонить маме", Status: StatusOpen, Created: now.Add(-time.Hour)},
		{ID: 4, Text: "продлить домен", Status: StatusCandidate, Created: now.Add(-30 * day), Due: &yesterday},
	}
	got := Stalls(items, now)
	if len(got) != 3 {
		t.Fatalf("shapes = %+v, want overdue, sitting, unconfirmed", got)
	}
	if got[0].N != 1 {
		t.Errorf("overdue = %d, want 1 — a candidate's due date is Maven's reading of a mail", got[0].N)
	}
	if got[1].N != 2 {
		t.Errorf("sitting = %d, want 2", got[1].N)
	}
	if got[2].N != 1 {
		t.Errorf("unconfirmed = %d, want 1", got[2].N)
	}
	line := StallsRU(got)
	for _, want := range []string{"просрочено", "лежит", "подтверждения"} {
		if !strings.Contains(line, want) {
			t.Errorf("StallsRU = %q, want it to mention %q", line, want)
		}
	}
}

func TestStallsSaysNothingWhenThereIsNothing(t *testing.T) {
	now := stallNow()
	items := []Item{{ID: 1, Text: "купить молоко", Status: StatusOpen, Created: now.Add(-time.Hour)}}
	if got := Stalls(items, now); len(got) != 0 {
		t.Fatalf("shapes = %+v, want none", got)
	}
	// "ничего не залежалось" appended to every list read is a nag with a
	// friendly face, so the empty case renders as nothing at all.
	if got := StallsRU(nil); got != "" {
		t.Errorf("StallsRU(nil) = %q, want empty", got)
	}
}

func TestStallsCountsOverdueByCalendarDay(t *testing.T) {
	// Same reading as Rank, or the count above the table contradicts the reason
	// in the row: due at 09:00, asked at 12:00, and it is still due today.
	now := stallNow()
	earlier := now.Add(-3 * time.Hour)
	items := []Item{{ID: 1, Text: "оплатить интернет", Status: StatusOpen, Created: now.Add(-time.Hour), Due: &earlier}}
	if got := Stalls(items, now); len(got) != 0 {
		t.Fatalf("shapes = %+v, want none — a task due today is not overdue", got)
	}
}

func TestStallsIgnoresATaskWithNoCaptureTime(t *testing.T) {
	// The zero time is January of year 1, so an unstamped row would count as
	// sitting forever.
	now := stallNow()
	items := []Item{{ID: 1, Text: "купить молоко", Status: StatusOpen}}
	if got := Stalls(items, now); len(got) != 0 {
		t.Fatalf("shapes = %+v, want none", got)
	}
}

func TestStallsCountsNoJudgement(t *testing.T) {
	// The line this shape may not cross. Every sentence states a count; none of
	// them says whether the work matters or should be dropped.
	now := stallNow()
	items := []Item{{ID: 1, Text: "оплатить интернет", Status: StatusOpen, Created: now.Add(-40 * 24 * time.Hour)}}
	line := StallsRU(Stalls(items, now))
	for _, banned := range []string{"стоит", "лучше", "надо", "брось", "важно"} {
		if strings.Contains(line, banned) {
			t.Errorf("StallsRU = %q — %q is an assessment, and counting is the whole licence here", line, banned)
		}
	}
}