package views

import (
	"fmt"
	"strings"
	"unicode"

	"task/internal/ticket"
)

// GroupByMenu renders a report grouping picker.
type GroupByMenu struct {
	Cursor int
	Width  int
	Styles StatusMenuStyles
}

// NewGroupByMenu creates a menu with the given grouping pre-selected.
func NewGroupByMenu(current ticket.GroupBy, width int, styles StatusMenuStyles) GroupByMenu {
	return GroupByMenu{
		Cursor: current.Index(),
		Width:  width,
		Styles: styles,
	}
}

// MoveDown moves the selection down.
func (m *GroupByMenu) MoveDown() {
	if m.Cursor < len(ticket.AllGroupBys)-1 {
		m.Cursor++
	}
}

// MoveUp moves the selection up.
func (m *GroupByMenu) MoveUp() {
	if m.Cursor > 0 {
		m.Cursor--
	}
}

// JumpToShortcut moves the cursor to the option whose shortcut matches r.
func (m *GroupByMenu) JumpToShortcut(r rune) bool {
	r = unicode.ToLower(r)
	for i, g := range ticket.AllGroupBys {
		if g.Shortcut() == r {
			m.Cursor = i
			return true
		}
	}
	return false
}

// Selected returns the currently highlighted grouping.
func (m GroupByMenu) Selected() ticket.GroupBy {
	if m.Cursor < 0 || m.Cursor >= len(ticket.AllGroupBys) {
		return ticket.GroupByProject
	}
	return ticket.AllGroupBys[m.Cursor]
}

// View renders the grouping menu.
func (m GroupByMenu) View() string {
	var lines []string
	lines = append(lines, m.Styles.Title.Render("Group report by"))
	for i, g := range ticket.AllGroupBys {
		entry := fmt.Sprintf("%c  %s", g.Shortcut(), g.Label())
		if i == m.Cursor {
			lines = append(lines, m.Styles.Selected.Render("▸ "+entry))
		} else {
			lines = append(lines, m.Styles.Normal.Render("  "+entry))
		}
	}
	body := strings.Join(lines, "\n")
	w := m.Width
	if w < 20 {
		w = 20
	}
	return m.Styles.Box.Width(min(40, w-2)).Render(body)
}