// search_picker.go implements a fuzzy search overlay for messages in the
// current channel. Opened via the search keybind, it lets users filter
// messages by author name and content, then jump to the selected message.
package chat

import (
	"github.com/ayn2op/discordo/internal/config"
	"github.com/ayn2op/tview"
	"github.com/ayn2op/tview/help"
	"github.com/ayn2op/tview/keybind"
	"github.com/ayn2op/tview/picker"
)

const searchPickerLayerName = "searchPicker"

type searchPicker struct {
	*picker.Model
	chatView   *Model
	browseMode bool
}

var _ help.KeyMap = (*searchPicker)(nil)

func newSearchPicker(cfg *config.Config, chatView *Model) *searchPicker {
	sp := &searchPicker{Model: picker.NewModel(), chatView: chatView}
	ConfigurePicker(sp.Model, cfg, "Search")
	return sp
}

// resetBrowse starts the search picker in input mode so users can type a query immediately.
func (sp *searchPicker) resetBrowse() { sp.browseMode = false }

func (sp *searchPicker) HandleEvent(event tview.Event) tview.Command {
	switch event := event.(type) {
	case *tview.KeyEvent:
		if cmd, handled := pickerBrowseHandleKey(event, &sp.browseMode, sp.Model, func() { sp.chatView.closeSearch() }); handled {
			return cmd
		}
	case *picker.SelectedEvent:
		messageIndex, ok := event.Reference.(int)
		if !ok {
			return nil
		}

		sp.chatView.closeSearch()
		sp.chatView.messagesList.SetCursor(messageIndex)
		return tview.SetFocus(sp.chatView.messagesList)
	case *picker.CancelEvent:
		sp.chatView.closeSearch()
		return nil
	}
	return sp.Model.HandleEvent(event)
}

func (sp *searchPicker) update() {
	messages := sp.chatView.messagesList.messages
	items := make(picker.Items, 0, len(messages))
	for i, msg := range messages {
		text := msg.Author.DisplayOrUsername() + ": " + msg.Content
		if len(text) > 120 {
			text = text[:120] + "..."
		}
		items = append(items, picker.Item{
			Text:       text,
			FilterText: msg.Author.DisplayOrUsername() + " " + msg.Content,
			Reference:  i,
		})
	}
	sp.Model.SetItems(items)
}

func (sp *searchPicker) ShortHelp() []keybind.Keybind {
	return pickerShortHelp(sp.chatView.cfg.Keybinds.Picker)
}

func (sp *searchPicker) FullHelp() [][]keybind.Keybind {
	return pickerFullHelp(sp.chatView.cfg.Keybinds.Picker)
}