tracking_dashboard.lua

-- Tracking Dashboard (tracking_dashboard.lua)
-- Runs in a separate tab on the server to monitor student locations

local disk = peripheral.find("drive")
if not disk then
    print("Error: No disk drive found.")
    -- Continue anyway as we might not need disk if API works
end

-- Load API using dofile for compatibility
local ndisk = dofile("ndisk_api.lua")

-- Initialize NDisk
ndisk.init()

local function getStudents()
    local students = ndisk.list("students")
    local data = {}
    for _, id in ipairs(students) do
        -- Check if it's a valid student (not strictly needed as list returns items in students/)
        -- Assuming id is the folder name
        local historyPath = "students/" .. id .. "/location_history.txt"
        if ndisk.exists(historyPath) then
            local content = ndisk.read(historyPath)
            if content and #content > 0 then
                -- Get last line
                local lastLine = nil
                for line in content:gmatch("[^\r\n]+") do
                    lastLine = line
                end

                if lastLine then
                    local timestamp, coords = lastLine:match("([^|]+)|(.+)")
                    if timestamp and coords then
                        table.insert(data, {id = id, time = timestamp, coords = coords})
                    end
                end
            end
        end
    end
    return data
end

local function drawDashboard()
    term.clear()
    term.setCursorPos(1, 1)
    print("MtnLabs Student Tracking")
    print("========================")

    local students = getStudents()
    if #students == 0 then
        print("No active tracking data found.")
    else
        print(string.format("%-10s | %-15s | %s", "ID", "Time", "Location"))
        print(string.rep("-", 40))
        for _, s in ipairs(students) do
             -- Format time (simple epoch to string if needed, or raw)
             -- os.epoch("local") returns milliseconds.
             -- Maybe convert to readable? For now raw.
             local timeStr = s.time
             if tonumber(s.time) then
                 timeStr = os.date("%H:%M:%S", tonumber(s.time)/1000)
             end
             print(string.format("%-10s | %-15s | %s", s.id, timeStr, s.coords))
        end
    end
    print("========================")
    print("Press 'q' to exit.")
end

while true do
    drawDashboard()
    local timer = os.startTimer(60) -- Refresh every 60s
    local event, p1 = os.pullEvent()
    if event == "char" and p1 == "q" then
        break
    elseif event == "timer" and p1 == timer then
        -- Refresh
    end
end