superwork/tui/internal/tui/scroll_test.go

package tui

import (
	"fmt"
	"strings"
	"testing"

	"charm.land/lipgloss/v2"
	"superwork-tui/internal/issue"
)

func makeDoneIssues(n int) []issue.Issue {
	issues := make([]issue.Issue, n)
	for i := range issues {
		issues[i] = issue.Issue{Number: i + 1, Title: fmt.Sprintf("Issue %d", i+1), Column: issue.ColumnDone}
	}
	return issues
}

func makeInProgressIssues(n int) []issue.Issue {
	issues := make([]issue.Issue, n)
	for i := range issues {
		issues[i] = issue.Issue{Number: i + 1, Title: fmt.Sprintf("Issue %d", i+1), Column: issue.ColumnInProgress}
	}
	return issues
}

func makeTodoIssues(n int) []issue.Issue {
	issues := make([]issue.Issue, n)
	for i := range issues {
		issues[i] = issue.Issue{Number: i + 1, Title: fmt.Sprintf("Issue %d", i+1), Column: issue.ColumnTodo}
	}
	return issues
}

// TestRenderColumn_HeightBound: 30 done issues with boxH=20 must render exactly 20 lines (outer) and show ▼.
func TestRenderColumn_HeightBound(t *testing.T) {
	doneIssues := makeDoneIssues(30)
	all := make([]issue.Issue, len(doneIssues))
	copy(all, doneIssues)
	var buckets [4][]issue.Issue
	buckets[3] = doneIssues

	m := Model{
		state:   stateLoaded,
		issues:  all,
		buckets: buckets,
		width:   120,
		height:  40,
		colIdx:  0,
		rowIdx:  0,
	}

	const boxH = 20
	result := m.renderColumn(3, 30, boxH)
	h := lipgloss.Height(result)
	// outer box = inner(boxH-2) + 2 border rows = boxH
	if h != boxH {
		t.Errorf("renderColumn height = %d, want %d", h, boxH)
	}
	if !strings.Contains(result, "▼") {
		t.Errorf("renderColumn missing ▼ indicator when cards overflow; got:\n%s", result)
	}
}

// TestRenderColumn_ScrollIntoView: 20 in-progress issues, selected at rowIdx=15.
// boxH=10 → cardsH=7, so card at idx=15 requires scrolling. Expect ▲ and card visible.
func TestRenderColumn_ScrollIntoView(t *testing.T) {
	inpIssues := makeInProgressIssues(20)
	var buckets [4][]issue.Issue
	buckets[1] = inpIssues

	m := Model{
		state:   stateLoaded,
		issues:  inpIssues,
		buckets: buckets,
		width:   120,
		height:  40,
		colIdx:  1,
		rowIdx:  15,
	}

	const boxH = 10 // cardsH = 10-3 = 7; card at idx=15 needs scroll
	result := m.renderColumn(1, 30, boxH)
	want := fmt.Sprintf("Issue %d", 16) // rowIdx=15 → Number=16
	if !strings.Contains(result, want) {
		t.Errorf("renderColumn missing selected card %q after scroll; got:\n%s", want, result)
	}
	if !strings.Contains(result, "▲") {
		t.Errorf("renderColumn missing ▲ indicator when scrolled down; got:\n%s", result)
	}
}

// TestBoardView_HeightBound: board with height=30 and 30 done issues — column portion height = height-2.
func TestBoardView_HeightBound(t *testing.T) {
	doneIssues := makeDoneIssues(30)
	var buckets [4][]issue.Issue
	buckets[3] = doneIssues

	m := Model{
		state:   stateLoaded,
		issues:  doneIssues,
		buckets: buckets,
		width:   120,
		height:  30,
		colIdx:  0,
		rowIdx:  0,
	}

	v := m.boardView()
	// Extract board portion (everything before the final help line).
	lines := strings.Split(v, "\n")
	// Help line is the last non-empty line. Board = height-2 outer rows.
	// Total view lines ≤ m.height (board rows + 1 help row).
	h := lipgloss.Height(v)
	if h > m.height {
		t.Errorf("boardView total height = %d, want ≤ %d", h, m.height)
	}
	_ = lines
}

// TestRenderColumn_EmptyColEqualHeight: empty col 0 and 5-issue col 1 must both render at boxH.
func TestRenderColumn_EmptyColEqualHeight(t *testing.T) {
	inpIssues := makeInProgressIssues(5)
	var buckets [4][]issue.Issue
	buckets[1] = inpIssues

	m := Model{
		state:   stateLoaded,
		issues:  inpIssues,
		buckets: buckets,
		width:   120,
		height:  40,
		colIdx:  1,
		rowIdx:  0,
	}

	const boxH = 20
	emptyCol := m.renderColumn(0, 30, boxH)
	filledCol := m.renderColumn(1, 30, boxH)
	hEmpty := lipgloss.Height(emptyCol)
	hFilled := lipgloss.Height(filledCol)
	if hEmpty != boxH {
		t.Errorf("empty col height=%d, want %d", hEmpty, boxH)
	}
	if hFilled != boxH {
		t.Errorf("filled col height=%d, want %d", hFilled, boxH)
	}
}

// TestRenderColumn_TodoScrollIntoView: 15 todo issues, selected at rowIdx=12 → card visible + ▲ shown.
func TestRenderColumn_TodoScrollIntoView(t *testing.T) {
	todoIssues := makeTodoIssues(15)
	var buckets [4][]issue.Issue
	buckets[0] = todoIssues

	m := Model{
		state:   stateLoaded,
		issues:  todoIssues,
		buckets: buckets,
		width:   120,
		height:  40,
		colIdx:  0,
		rowIdx:  12,
	}

	result := m.renderColumn(0, 30, 15)
	want := fmt.Sprintf("Issue %d", 13) // rowIdx=12 → index 12 → Number=13
	if !strings.Contains(result, want) {
		t.Errorf("todo renderColumn missing selected card %q after scroll; got:\n%s", want, result)
	}
	if !strings.Contains(result, "▲") {
		t.Errorf("todo renderColumn missing ▲ indicator when scrolled down; got:\n%s", result)
	}
}