package views

import (
	"fmt"
	"strings"
	"unicode"

	"task/internal/ticket"
)

// BoardMenu renders a multi-select board-list picker overlay.
type BoardMenu struct {
	Cursor   int
	Width    int
	Styles   StatusMenuStyles
	selected map[ticket.BoardList]bool
}

// NewBoardMenu creates a menu with the given filter pre-selected.
func NewBoardMenu(current ticket.BoardFilter, width int, styles StatusMenuStyles) BoardMenu {
	current = ticket.NormalizeFilter(current)
	sel := map[ticket.BoardList]bool{}
	for _, bl := range current {
		sel[bl] = true
	}
	cursor := 0
	for i, bl := range ticket.AllBoardLists {
		if sel[bl] {
			cursor = i
			break
		}
	}
	return BoardMenu{
		Cursor:   cursor,
		Width:    width,
		Styles:   styles,
		selected: sel,
	}
}

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

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

// JumpToShortcut moves the cursor to the list whose label starts with r.
func (m *BoardMenu) JumpToShortcut(r rune) bool {
	r = unicode.ToLower(r)
	for i, bl := range ticket.AllBoardLists {
		if bl.Shortcut() == r {
			m.Cursor = i
			return true
		}
	}
	return false
}

// Toggle flips the checked state of the highlighted list.
func (m *BoardMenu) Toggle() {
	if m.selected == nil {
		m.selected = map[ticket.BoardList]bool{}
	}
	bl := ticket.AllBoardLists[m.Cursor]
	if bl == ticket.BoardAll {
		m.selected = map[ticket.BoardList]bool{ticket.BoardAll: true}
		return
	}
	delete(m.selected, ticket.BoardAll)
	if m.selected[bl] {
		delete(m.selected, bl)
	} else {
		m.selected[bl] = true
	}
	if len(m.selected) == 0 {
		m.selected[ticket.BoardAll] = true
	}
}

// Selected returns the current multi-select filter.
func (m BoardMenu) Selected() ticket.BoardFilter {
	var out ticket.BoardFilter
	for _, bl := range ticket.AllBoardLists {
		if m.selected[bl] {
			out = append(out, bl)
		}
	}
	return ticket.NormalizeFilter(out)
}

// View renders the board menu.
func (m BoardMenu) View() string {
	var lines []string
	lines = append(lines, m.Styles.Title.Render("Filter lists"))
	for i, bl := range ticket.AllBoardLists {
		mark := "[ ]"
		if m.selected[bl] {
			mark = "[x]"
		}
		entry := fmt.Sprintf("%s %c  %s", mark, bl.Shortcut(), bl.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(44, w-2)).Render(body)
}