////
// runs commands and such.

import type { CommandResult } from "./shared/types"
import { join } from "path"
import { NOSE_BIN } from "./config"
import { isFile } from "./utils"

export async function runCommand(input: string): Promise<CommandResult> {
    const [cmd = "", ...args] = input.split(" ")

    if (!commandExists(cmd)) {
        return { status: "error", output: `${cmd} not found` }
    }

    let status: "ok" | "error" = "ok"
    let output = ""

    try {
        [status, output] = await exec(cmd, args)
    } catch (err) {
        status = "error"
        output = errorMessage(err)
    }

    return { status, output }
}

async function exec(cmd: string, args: string[]): Promise<["ok" | "error", string]> {
    const module = await import(commandPath(cmd) + "?t+" + Date.now())

    if (!module || !module.default) {
        return ["error", `${cmd} has no default export`]
    }

    return ["ok", await module.default(...args)]
}

function commandPath(cmd: string): string {
    return join(NOSE_BIN, cmd + ".ts")
}

function commandExists(cmd: string): boolean {
    return isFile(commandPath(cmd))
}

function errorMessage(error: Error | any): string {
    if (!(error instanceof Error))
        return String(error)

    let msg = `${error.name}: ${error.message}`
    if (error.stack) msg += `\n${error.stack}`
    return msg
}