package ui

import (
	"strings"

	"github.com/charmbracelet/lipgloss"
)

type helpEntry struct {
	key  string
	desc string
}

func (m Model) helpEntries() []helpEntry {
	switch m.mode {
	case ModeCreate:
		return []helpEntry{
			{"enter", "save"},
			{"esc", "cancel"},
		}
	case ModeSearch:
		return []helpEntry{
			{"enter", "apply"},
			{"esc", "cancel"},
		}
	case ModeProjects:
		return []helpEntry{
			{"j/k", "navigate"},
			{"enter", "select"},
			{"n", "new project"},
			{"esc", "cancel"},
		}
	case ModeStatus:
		return []helpEntry{
			{"j/k", "select"},
			{"enter", "apply"},
			{"esc", "cancel"},
		}
	case ModeBoard:
		return []helpEntry{
			{"j/k", "select"},
			{"enter", "apply"},
			{"esc", "cancel"},
		}
	default:
		return []helpEntry{
			{"j/k", "navigate"},
			{"n", "new"},
			{"e", "edit"},
			{"u/U", "undo/redo"},
			{"/", "search"},
			{"p", "project"},
			{"l", "list"},
			{"s", "status"},
			{"X", "delete"},
			{"q", "quit"},
		}
	}
}

func (m Model) renderHelpbar() string {
	var parts []string
	for _, e := range m.helpEntries() {
		parts = append(parts, m.styles.HelpKey.Render(e.key)+" "+m.styles.HelpDesc.Render(e.desc))
	}
	sep := m.styles.HelpSep.String()
	if sep == "" {
		sep = "  "
	}
	return strings.Join(parts, sep)
}

func (m Model) renderFooter() string {
	help := m.renderHelpbar()
	ver := m.styles.Version.Render(m.version)

	width := m.width
	if width <= 0 {
		width = lipgloss.Width(help) + lipgloss.Width(ver) + 1
	}

	helpW := lipgloss.Width(help)
	verW := lipgloss.Width(ver)
	gap := width - helpW - verW
	if gap < 1 {
		maxHelp := width - verW - 1
		if maxHelp < 0 {
			maxHelp = 0
		}
		help = truncateWidth(help, maxHelp)
		helpW = lipgloss.Width(help)
		gap = width - helpW - verW
		if gap < 1 {
			gap = 1
		}
	}
	return help + strings.Repeat(" ", gap) + ver
}

func truncateWidth(s string, max int) string {
	if max <= 0 {
		return ""
	}
	if lipgloss.Width(s) <= max {
		return s
	}
	runes := []rune(s)
	for len(runes) > 0 {
		runes = runes[:len(runes)-1]
		if lipgloss.Width(string(runes)) <= max-1 {
			return string(runes) + "…"
		}
	}
	return ""
}