package tui

import (
    "charm.land/bubbles/v2/list"
    "charm.land/lipgloss/v2"
)

// sessionItem implements list.DefaultItem for the sessions picker.
type sessionItem struct {
    id        int
    title     string
    createdAt string
}

func (i sessionItem) Title() string {
    title := i.title
    if len(title) > 40 {
        title = title[:37] + "..."
    }
    return title
}

func (i sessionItem) Description() string {
    return i.createdAt
}

func (i sessionItem) FilterValue() string { return i.title }

// SessionsPickerState holds state for the sessions picker overlay.
type SessionsPickerState struct {
    List     list.Model
    Sessions []SessionListItem
}

// newSessionsPickerState creates a new SessionsPickerState with a bubbles list.
func newSessionsPickerState(sessions []SessionListItem, width int, isDark bool) *SessionsPickerState {
    items := make([]list.Item, len(sessions))
    for i, s := range sessions {
        items[i] = sessionItem{
            id:        s.ID,
            title:     s.Title,
            createdAt: s.CreatedAt,
        }
    }

    delegate := list.NewDefaultDelegate()
    delegate.Styles = list.NewDefaultItemStyles(isDark)
    delegate.SetSpacing(0)

    maxW := 54
    if width-8 > maxW {
        maxW = width - 8
    }
    if maxW > 64 {
        maxW = 64
    }

    // Height: items fit, max 20 lines
    pickerH := len(sessions)*delegate.Height() + 4 // +4 for title + filter
    if pickerH > 20 {
        pickerH = 20
    }

    l := list.New(items, delegate, maxW-4, pickerH)
    l.Title = "Sessions"
    l.SetShowStatusBar(false)
    l.SetShowHelp(false)
    l.SetShowPagination(true)
    l.SetFilteringEnabled(true)
    l.DisableQuitKeybindings()

    return &SessionsPickerState{
        List:     l,
        Sessions: sessions,
    }
}

// renderSessionsPicker renders the sessions picker overlay.
func (m *Model) renderSessionsPicker() string {
    ps := m.sessionsPickerState
    if ps == nil {
        return ""
    }

    maxW := 54
    if m.width-8 > maxW {
        maxW = m.width - 8
    }
    if maxW > 64 {
        maxW = 64
    }

    box := lipgloss.NewStyle().
        Border(lipgloss.RoundedBorder()).
        BorderForeground(m.styles.FocusIndicator.GetForeground()).
        Padding(0, 1).
        Width(maxW)

    return box.Render(ps.List.View())
}

// closeSessionsPicker dismisses the sessions picker overlay.
func (m *Model) closeSessionsPicker() {
    m.sessionsPickerState = nil
    m.overlay = OverlayNone
    m.input.Focus()
}