package tui

import "strings"

func renderHelp(width, height int) string {
	sections := []struct {
		title string
		binds [][2]string
	}{
		{"Navigation", [][2]string{
			{"j/k ↑/↓", "move cursor"},
			{"g/G home/end", "top / bottom"},
			{"pgup/pgdn", "page up / down"},
			{"enter", "view detail"},
			{"esc", "back / clear filter"},
		}},
		{"Views", [][2]string{
			{"1", "stream view"},
			{"2", "cards view"},
			{"s", "cycle sort (cards)"},
			{"tab", "cycle intent (cards)"},
		}},
		{"Actions", [][2]string{
			{"a", "add entity (or ?query to search)"},
			{"d", "delete (with confirm)"},
			{"x", "toggle todo completion"},
			{"!", "toggle pin"},
			{"#", "filter by tag"},
			{"m", "absorb (merge into target)"},
			{"p", "promote to card"},
		}},
		{"Detail View", [][2]string{
			{"p", "promote to card"},
			{"D", "demote to fluid"},
			{"c", "copy to clipboard"},
			{"e", "edit in $EDITOR"},
			{"!", "toggle pin"},
			{"r", "run checklist"},
			{"f", "fill template"},
		}},
		{"Run Mode", [][2]string{
			{"j/k", "move between steps"},
			{"space", "toggle step"},
			{"r", "reset all steps"},
			{"esc", "save + exit"},
		}},
		{"Fill Mode", [][2]string{
			{"tab", "next slot"},
			{"shift+tab", "prev slot"},
			{"enter", "copy resolved"},
			{"esc", "cancel"},
		}},
		{"Split View", [][2]string{
			{"l", "focus detail pane"},
			{"h", "focus list pane"},
			{"esc", "close detail / back"},
		}},
		{"Global", [][2]string{
			{"?", "toggle help"},
			{"q / ctrl+c", "quit"},
		}},
	}

	var b strings.Builder
	b.WriteString(detailHeaderStyle.Render("keybindings"))
	b.WriteString("\n\n")

	for _, s := range sections {
		b.WriteString(titleStyle.Render(s.title))
		b.WriteString("\n")
		for _, bind := range s.binds {
			key := helpKeyStyle.Render(bind[0])
			desc := helpDescStyle.Render(bind[1])
			b.WriteString("  " + key + "  " + desc + "\n")
		}
		b.WriteString("\n")
	}

	b.WriteString(helpStyle.Render("press ? or esc to close"))

	lines := strings.Split(b.String(), "\n")
	if len(lines) > height {
		lines = lines[:height]
	}
	return strings.Join(lines, "\n")
}