import yaml from 'js-yaml'
import { Store } from '../Store.js'

const INDENTS: Record<string, number | string | undefined> = {
	'2_spaces': 2,
	'4_spaces': 4,
	tabs: '\t',
	minified: undefined,
}

// eslint-disable-next-line @typescript-eslint/consistent-type-imports
let commentJson: typeof import('comment-json') | null = null

const FORMATS: Record<string, {
	parse: (v: string) => Promise<unknown>,
	stringify: (v: unknown, indentation: string | number | undefined) => string,
}> = {
	json: {
		parse: async (v) => {
			try {
				return JSON.parse(v)
			} catch (e) {
				commentJson = await import('comment-json')
				return commentJson.parse(v)
			}
		},
		stringify: (v, i) => (commentJson ?? JSON).stringify(v, null, i) + '\n',
	},
	yaml: {
		parse: async (v) => yaml.load(v),
		stringify: (v, i) => yaml.dump(v, {
			flowLevel: i === undefined ? 0 : -1,
			indent: typeof i === 'string' ? 4 : i,
		}),
	},
}

export function stringifySource(data: unknown, format?: string, indent?: string) {
	return FORMATS[format ?? Store.getFormat()].stringify(data, INDENTS[indent ?? Store.getIndent()])
}

export async function parseSource(data: string, format: string) {
	return await FORMATS[format].parse(data)
}

export function getSourceIndent(indent: string) {
	return INDENTS[indent]
}

export function getSourceIndents() {
	return Object.keys(INDENTS)
}

export function getSourceFormats() {
	return Object.keys(FORMATS)
}