package tui

import (
	"strings"

	"github.com/charmbracelet/lipgloss"
)

type helpBinding struct {
	Key  string
	Desc string
}

func (a *App) activeTabBindings() ([]helpBinding, bool) {
	switch a.activeTab {
	case TabScan:
		return []helpBinding{
			{"s", "start scan"},
			{"r", "retry errored rows"},
			{"enter", "show row detail"},
			{"esc", "cancel running scan / close modal"},
		}, true
	case TabEvaluate:
		return []helpBinding{
			{"r", "refresh pending"},
			{"e", "evaluate pending batch"},
			{"enter", "open report"},
			{"esc", "cancel running eval / close modal"},
		}, true
	case TabTracker:
		return []helpBinding{
			{"r", "refresh list"},
			{"a", "advance status (state machine)"},
			{"n", "add note to selected app"},
			{"f", "show pending follow-ups"},
		}, true
	case TabReports:
		return []helpBinding{
			{"enter", "open report file"},
			{"/", "filter by company"},
			{"r", "refresh list"},
		}, true
	case TabSettings:
		return []helpBinding{
			{"↑/↓", "move between fields"},
			{"enter", "edit field"},
			{"esc", "cancel edit"},
		}, true
	case TabIntake:
		return []helpBinding{
			{"tab", "next field"},
			{"enter", "advance phase"},
		}, true
	}
	return nil, false
}

func (a *App) renderHelp() string {
	var b strings.Builder
	b.WriteString(StyleTitle.Render("Help — keybindings"))
	b.WriteString("\n\n")
	b.WriteString(StyleSubtitle.Render("Global"))
	b.WriteString("\n")
	global := []helpBinding{
		{"↑/↓", "switch tab (sidebar)"},
		{"j/k", "move cursor in table"},
		{"enter", "select / drill in"},
		{"tab/shift+tab", "switch tab"},
		{"?", "toggle help"},
		{"q / ctrl+c", "quit"},
	}
	for _, kb := range global {
		b.WriteString("  ")
		b.WriteString(StyleKey.Render(padRight(kb.Key, 14)))
		b.WriteString(StyleKeyDesc.Render(kb.Desc))
		b.WriteString("\n")
	}
	if tab, ok := a.activeTabBindings(); ok {
		b.WriteString("\n")
		b.WriteString(StyleSubtitle.Render(a.activeTab))
		b.WriteString("\n")
		for _, kb := range tab {
			b.WriteString("  ")
			b.WriteString(StyleKey.Render(padRight(kb.Key, 14)))
			b.WriteString(StyleKeyDesc.Render(kb.Desc))
			b.WriteString("\n")
		}
	}
	b.WriteString("\n")
	b.WriteString(StyleKeyDesc.Render("press ? or esc to close"))
	return lipgloss.NewStyle().Width(52).Render(StyleModal.Render(b.String()))
}

func padRight(s string, n int) string {
	if len(s) >= n {
		return s
	}
	return s + strings.Repeat(" ", n-len(s))
}