-- SPDX-FileCopyrightText: 2017 Daniel Ratcliffe
--
-- SPDX-License-Identifier: LicenseRef-CCPL

local function printUsage()
    local programName = arg[0] or fs.getName(shell.getRunningProgram())
    print("Usage:")
    print("  " .. programName .. " <name> <program> <arguments>")
    print("  " .. programName .. " scale <name> <scale>")
    return
end

local tArgs = { ... }
if #tArgs < 2 or tArgs[1] == "scale" and #tArgs < 3 then
    printUsage()
    return
end

if tArgs[1] == "scale" then
    local sName = tArgs[2]
    if peripheral.getType(sName) ~= "monitor" then
        print("No monitor named " .. sName)
        return
    end

    local nRes = tonumber(tArgs[3])
    if nRes == nil or nRes < 0.5 or nRes > 5 then
        print("Invalid scale: " .. tArgs[3])
        return
    end

    peripheral.call(sName, "setTextScale", nRes)
    return
end

local sName = tArgs[1]
if peripheral.getType(sName) ~= "monitor" then
    print("No monitor named " .. sName)
    return
end

local sProgram = tArgs[2]
local sPath = shell.resolveProgram(sProgram)
if sPath == nil then
    print("No such program: " .. sProgram)
    return
end

print("Running " .. sProgram .. " on monitor " .. sName)

local monitor = peripheral.wrap(sName)
local previousTerm = term.redirect(monitor)

local co = coroutine.create(function()
    (shell.execute or shell.run)(sProgram, table.unpack(tArgs, 3))
end)

local function resume(...)
    local ok, param = coroutine.resume(co, ...)
    if not ok then
        printError(param)
    end
    return param
end

local timers = {}

local ok, param = pcall(function()
    local sFilter = resume()
    while coroutine.status(co) ~= "dead" do
        local tEvent = table.pack(os.pullEventRaw())
        if sFilter == nil or tEvent[1] == sFilter or tEvent[1] == "terminate" then
            sFilter = resume(table.unpack(tEvent, 1, tEvent.n))
        end
        if coroutine.status(co) ~= "dead" and (sFilter == nil or sFilter == "mouse_click") then
            if tEvent[1] == "monitor_touch" and tEvent[2] == sName then
                timers[os.startTimer(0.1)] = { tEvent[3], tEvent[4] }
                sFilter = resume("mouse_click", 1, table.unpack(tEvent, 3, tEvent.n))
            end
        end
        if coroutine.status(co) ~= "dead" and (sFilter == nil or sFilter == "term_resize") then
            if tEvent[1] == "monitor_resize" and tEvent[2] == sName then
                sFilter = resume("term_resize")
            end
        end
        if coroutine.status(co) ~= "dead" and (sFilter == nil or sFilter == "mouse_up") then
            if tEvent[1] == "timer" and timers[tEvent[2]] then
                sFilter = resume("mouse_up", 1, table.unpack(timers[tEvent[2]], 1, 2))
                timers[tEvent[2]] = nil
            end
        end
    end
end)

term.redirect(previousTerm)
if not ok then
    printError(param)
end