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-- The shape every task in the manager must follow
type Task = {
    id: number,
    title: string,
    done: boolean,
}

-- The task list: a typed array of Task shapes
local tasks: {Task} = {
    {id = 1, title = "Learn Luau types", done = false},
    {id = 2, title = "Build a task manager", done = false},
    {id = 3, title = "Write tests", done = true},
}

-- Build a typed task with the next free id and insert it
local function addTask(list: {Task}, title: string): Task
    local newTask: Task = {
        id = #list + 1,
        title = title,
        done = false,
    }
    table.insert(list, newTask)
    return newTask
end

-- Mark the task with the given id as done; report success
local function completeTask(list: {Task}, id: number): boolean
    for _, t in ipairs(list) do
        if t.id == id then
            t.done = true
            return true
        end
    end
    return false
end

-- Collect the tasks whose done flag matches into a new {Task}
local function filterTasks(list: {Task}, done: boolean): {Task}
    local result: {Task} = {}
    for _, t in ipairs(list) do
        if t.done == done then
            table.insert(result, t)
        end
    end
    return result
end

-- Print a one-line progress summary
local function printSummary(list: {Task}): ()
    local total = #list
    local doneCount = 0
    for _, t in ipairs(list) do
        if t.done then
            doneCount = doneCount + 1
        end
    end
    print(`{doneCount}/{total} tasks done`)
end

-- Watch the summary change as the list evolves
printSummary(tasks)
completeTask(tasks, 2)
printSummary(tasks)
addTask(tasks, "Take a break")
printSummary(tasks)