import { Item } from '../fs/Item'
import type { SimpleStream } from '../utils/SimpleStream'
import { Program } from './Program'

export class Cat extends Program {
    constructor() {
        super()
    }

    async Exec(_: SimpleStream<string>, stdout: SimpleStream<string>, __: Item, args: string[]): Promise<number> {
        let item: Item = await Item.open(args[1])

        if (!(await item.Exists())) {
            stdout.emit(`cat: error: item ${item.GetPath()} doesn't exist.\n`)
            return 1
        }

        if (item.IsDirectory()) {
            stdout.emit(`cat: error: can't read data from a directory; item ${item.GetPath()} is a directory.\n`)
            return 2
        }

        stdout.emit(`${item.ReadData()}`)
        stdout.emit('[ EOF ]\n')

        return 0
    }
}