import { App, Editor, EditorRange, EditorTransaction, MarkdownFileInfo, MarkdownView } from 'obsidian'
import BindThemPlugin from './main'
import { selectionToLine, selectionToRange } from './Utils'

/**
 * SelectionHelper provides commands for manipulating text selections
 */
export class SelectionHelper {
	public app: App
	private plugin: BindThemPlugin

	constructor(app: App, plugin: BindThemPlugin) {
		this.app = app
		this.plugin = plugin
	}

	/**
	 * Select the current line(s)
	 */
	public selectLine(editor: Editor, view: MarkdownView | MarkdownFileInfo): void {
		const selections = editor.listSelections()

		const newSelectionRanges: Array<EditorRange> = []
		for (const selection of selections) {
			const newSelection = selectionToLine(editor, selection)
			newSelectionRanges.push(selectionToRange(newSelection))
		}

		const transaction: EditorTransaction = {
			selections: newSelectionRanges,
		}

		editor.transaction(transaction, 'SelectionHelper_Line')
	}

	/**
	 * Select the current word(s)
	 */
	public selectWord(editor: Editor, view: MarkdownView | MarkdownFileInfo): void {
		const selections = editor.listSelections()

		const newSelections: Array<EditorRange> = []
		for (const selection of selections) {
			const range = selectionToRange(selection)

			const wordStart = editor.wordAt(range.from)?.from ?? range.from
			const wordEnd = editor.wordAt(range.to)?.to ?? range.from

			const newSelection: EditorRange = {
				from: { line: wordStart.line, ch: wordStart.ch },
				to: { line: wordEnd.line, ch: wordEnd.ch },
			}

			newSelections.push(newSelection)
		}

		const transaction: EditorTransaction = {
			selections: newSelections,
		}

		editor.transaction(transaction, 'SelectionHelper_Word')
	}
}