package model

import (
	"github.com/charmbracelet/crush/internal/ui/common"
	"github.com/charmbracelet/crush/internal/ui/lazylist"
	uv "github.com/charmbracelet/ultraviolet"
)

// Chat represents the chat UI model that handles chat interactions and
// messages.
type Chat struct {
	com  *common.Common
	list *lazylist.List
}

// NewChat creates a new instance of [Chat] that handles chat interactions and
// messages.
func NewChat(com *common.Common) *Chat {
	l := lazylist.NewList()
	l.SetGap(1)
	return &Chat{
		com:  com,
		list: l,
	}
}

// Height returns the height of the chat view port.
func (m *Chat) Height() int {
	return m.list.Height()
}

// Draw renders the chat UI component to the screen and the given area.
func (m *Chat) Draw(scr uv.Screen, area uv.Rectangle) {
	uv.NewStyledString(m.list.Render()).Draw(scr, area)
}

// SetSize sets the size of the chat view port.
func (m *Chat) SetSize(width, height int) {
	m.list.SetSize(width, height)
}

// Len returns the number of items in the chat list.
func (m *Chat) Len() int {
	return m.list.Len()
}

// PrependItems prepends new items to the chat list.
func (m *Chat) PrependItems(items ...lazylist.Item) {
	m.list.PrependItems(items...)
	m.list.ScrollToIndex(0)
}

// AppendMessages appends a new message item to the chat list.
func (m *Chat) AppendMessages(msgs ...MessageItem) {
	items := make([]lazylist.Item, len(msgs))
	for i, msg := range msgs {
		items[i] = msg
	}
	m.list.AppendItems(items...)
}

// AppendItems appends new items to the chat list.
func (m *Chat) AppendItems(items ...lazylist.Item) {
	m.list.AppendItems(items...)
	m.list.ScrollToIndex(m.list.Len() - 1)
}

// Focus sets the focus state of the chat component.
func (m *Chat) Focus() {
	m.list.Focus()
}

// Blur removes the focus state from the chat component.
func (m *Chat) Blur() {
	m.list.Blur()
}

// ScrollToTop scrolls the chat view to the top.
func (m *Chat) ScrollToTop() {
	m.list.ScrollToTop()
}

// ScrollToBottom scrolls the chat view to the bottom.
func (m *Chat) ScrollToBottom() {
	m.list.ScrollToBottom()
}

// ScrollBy scrolls the chat view by the given number of line deltas.
func (m *Chat) ScrollBy(lines int) {
	m.list.ScrollBy(lines)
}

// ScrollToSelected scrolls the chat view to the selected item.
func (m *Chat) ScrollToSelected() {
	m.list.ScrollToSelected()
}

// SelectedItemInView returns whether the selected item is currently in view.
func (m *Chat) SelectedItemInView() bool {
	return m.list.SelectedItemInView()
}

// SetSelected sets the selected message index in the chat list.
func (m *Chat) SetSelected(index int) {
	m.list.SetSelected(index)
}

// SelectPrev selects the previous message in the chat list.
func (m *Chat) SelectPrev() {
	m.list.SelectPrev()
}

// SelectNext selects the next message in the chat list.
func (m *Chat) SelectNext() {
	m.list.SelectNext()
}

// SelectFirst selects the first message in the chat list.
func (m *Chat) SelectFirst() {
	m.list.SelectFirst()
}

// SelectLast selects the last message in the chat list.
func (m *Chat) SelectLast() {
	m.list.SelectLast()
}

// SelectFirstInView selects the first message currently in view.
func (m *Chat) SelectFirstInView() {
	m.list.SelectFirstInView()
}

// SelectLastInView selects the last message currently in view.
func (m *Chat) SelectLastInView() {
	m.list.SelectLastInView()
}

// HandleMouseDown handles mouse down events for the chat component.
func (m *Chat) HandleMouseDown(x, y int) {
	m.list.HandleMouseDown(x, y)
}

// HandleMouseUp handles mouse up events for the chat component.
func (m *Chat) HandleMouseUp(x, y int) {
	m.list.HandleMouseUp(x, y)
}

// HandleMouseDrag handles mouse drag events for the chat component.
func (m *Chat) HandleMouseDrag(x, y int) {
	m.list.HandleMouseDrag(x, y)
}