--[[
Utility for downloading files via http.
By 00asdf
]]

local argParser = require("argparse").parser("wget", "Utility for downloading files via http")
    :optional("f", "override an existing file")
    :positional("url", "download target")
    :endRequired()
    :positional("filename", "optional name of the file, per default the last part of the url is taken")

local ok, opt, pos = argParser:parse(...)
if not ok then
    print(opt)
    return -1
end
local TARGET = pos.url
local FILENAME
if not pos.filename then
    local t = TARGET:split("/")
    FILENAME = t[#t]
    if not FILENAME or FILENAME == "" then
       error("The target does not specify a valid filename, please an explicit filename!")
    end
else
    FILENAME = pos.filename
end

local fs = require "filesystem"
if not opt.f and fs:fileExists(FILENAME) then
    error(string.format("File '%s' already exists! Specify '-f' to replace the file", FILENAME))
end

print("Downloading from " .. TARGET)
print("to " .. FILENAME)

local http = components:getFirst("internet")
if not http.isHttpEnabled or not http.isConnectedToWan then
    error("Failed to download: Connection failure, not connected to internet")
end

local response = http:sendHttpRequest(TARGET, "GET")
if response:getStatusCode() ~= 200 then
    error("Failed to download: Server responded with " .. tostring(response:getStatusCode()))
end

local content = response:getResponseBody()
print("Downloaded content, writing to file...")
fs:writeAllText(FILENAME, content)
print("Successfully downloaded file!")