import { installPackage } from '@antfu/install-pkg'
import { sleep } from '@antfu/utils'

export function camelize(str: string): string {
	return str.replace(/-([a-z0-9])/g, g => g[1].toUpperCase())
}

export function pascalize(str: string): string {
	const camel = camelize(str)
	return camel[0].toUpperCase() + camel.slice(1)
}

export function camelToKebab(key: string): string {
	const result = key
		.replace(/:/g, '-')
		.replace(/([A-Z])/g, ' $1')
		.trim()
	return result.split(/\s+/g).join('-').toLowerCase()
}

const warnned = new Set<string>()

export function warnOnce(msg: string): void {
	if (!warnned.has(msg)) {
		warnned.add(msg)
		console.warn(`[@iconify-loader] ${msg}`)
	}
}


let pending: Promise<void> | undefined
const tasks: Record<string, Promise<void> | undefined> = {}

export async function tryInstallPkg(name: string): Promise<void | undefined> {
	if (pending)
		await pending

	if (!tasks[name]) {
		// eslint-disable-next-line no-console
		console.log(`Installing ${name}...`)
		tasks[name] = pending = installPackage(name, { dev: true, preferOffline: true })
			.then(() => sleep(300))
			// eslint-disable-next-line
			.catch((e: any) => {
				warnOnce(`Failed to install ${name}`)
				console.error(e)
			})
			.finally(() => {
				pending = undefined
			})
	}

	// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
	return tasks[name]!
}