-- Enable Minetest forever.
minetest = core

firefly = {
    -- Set to `true` to enable testing admin things without having to open a server.
    singleplayer_admin = true
}
local ns = firefly

function include(file)
    return dofile(minetest.get_modpath(minetest.get_current_modname()).."/"..file)
end

function enum(cases)
    local out = {}
    local i = 0
    for _, x in ipairs(cases) do
        out[x] = i
        i = i +1
    end
    return out
end

say = minetest.chat_send_all

function extend(dst, src)
    for k, v in pairs(src) do
        dst[k] = v
    end
    return dst
end

Promise = {
    resolve = function(e, ...)
        if e.resolved then return end
        e.resolved = true
        if e._after then e._after(...) end
    end,
    after = function(e, fn)
        e._after = fn
    end
}
Promise.__index = Promise
setmetatable(Promise, {
    __call = function(_, fn)
        local e = {resolved = false}
        setmetatable(e, Promise)
        fn(function(...) e:resolve(...) end)
        return e
    end
})

EventTarget = {
    init = function()
        local e = {
            listeners = {}
        }
        return setmetatable(e, EventTarget)
    end,
    listen = function(e, channel, fn)
        if not e.listeners[channel] then e.listeners[channel] = {} end
        local l = e.listeners[channel]
        l[#l +1] = fn
    end,
    unlisten = function(e, channel, fn)
        if not e.listeners[channel] then return end
        local l = e.listeners[channel]
        local idx = table.indexof(l, fn)
        if idx < 0 then return end
        table.remove(l, idx)
    end,
    dispatch = function(e, channel, ...)
        local l = e.listeners[channel]
        if not l then return end
        for i = 1, #l do
            l[i](...)
        end
    end
}
EventTarget.__index = EventTarget
setmetatable(EventTarget, {
    __call = function(_, ...) return EventTarget.init(...) end
})

-- HACK: Lookup table for getting a rotation from a
-- facedir (because Minetest doesn't have any way
-- to get this information normally).
local facedir_rotations = {
    -- +Y
    [0] = vector.new(0, 0, 0),
    [1] = vector.new(0, math.pi * 1.5, 0),
    [2] = vector.new(0, math.pi * 1.0, 0),
    [3] = vector.new(0, math.pi * 0.5, 0),
    -- +Z
    [4] = vector.new(math.pi * 1.5, 0, 0),
    [5] = vector.new(0, math.pi * 1.5, math.pi * 1.5),
    [6] = vector.new(math.pi * 0.5, math.pi * 1.0, 0),
    [7] = vector.new(0, math.pi * 0.5, math.pi * 0.5),
    -- -Z
    [8] = vector.new(math.pi * 0.5, 0, 0),
    [9] = vector.new(0, math.pi * 1.5, math.pi * 0.5),
    [10] = vector.new(math.pi * 1.5, math.pi * 1.0, 0),
    [11] = vector.new(0, math.pi * 0.5, math.pi * 1.5),
    -- +X
    [12] = vector.new(0, 0, math.pi * 0.5),
    [13] = vector.new(math.pi * 1.5, math.pi * 1.5, 0),
    [14] = vector.new(0, math.pi * 1.0, math.pi * 1.5),
    [15] = vector.new(math.pi * 0.5, math.pi * 0.5, 0),
    -- -X
    [16] = vector.new(0, 0, math.pi * 1.5),
    [17] = vector.new(math.pi * 0.5, math.pi * 1.5, 0),
    [18] = vector.new(0, math.pi * 1.0, math.pi * 0.5),
    [19] = vector.new(math.pi * 1.5, math.pi * 0.5, 0),
    -- -Y
    [20] = vector.new(0, 0, math.pi * 1.0),
    [21] = vector.new(0, math.pi * 0.5, math.pi * 1.0),
    [22] = vector.new(0, math.pi * 1.0, math.pi * 1.0),
    [23] = vector.new(0, math.pi * 1.5, math.pi * 1.0),
}
function ns.facedir_to_rotation(facedir)
    return facedir_rotations[facedir] or minetest.facedir_to_dir(facedir):dir_to_rotation()
end

function ns.rotate_selectionbox(box, rot)
    local a = vector.new(box[1], box[2], box[3]):rotate(rot)
    local b = vector.new(box[4], box[5], box[6]):rotate(rot)
    return {
        a.x, a.y, a.z,
        b.x, b.y, b.z
    }
end

function ns.register_item(name, def)
    local needs_alias
    if not name:find ":" then
        def._name = name
        name = "firefly:"..name
        needs_alias = true
    end
    
    minetest.register_craftitem(":"..name, def)
    
    if needs_alias then
        minetest.register_alias(def._name, name)
    end
end

function ns.solid_color_frames(frames)
    local out = "[fill:1x"..#frames..":0,0:#000"
    for i, x in ipairs(frames) do
        out = out.."^[fill:1x3:0,"..(i -1)..":"..x
    end
    return out
end

local digit_widths = {
    [0] = 7,
    6,
    7,
    7,
    7,
    7,
    7,
    7,
    7,
    7,
}
function ns.texture_from_number(num)
    local w = 0
    local digits = {}
    repeat
        w = w +1
        digits[w] = num %10
        num = math.floor(num /10)
    until num <= 0
    local width = 0
    local out = ""
    for i = w, 1, -1 do
        out = out..":"..width..",1=firefly_number_"..digits[i]..".png"
        width = width +digit_widths[digits[i]] +(i > 1 and 2 or 0)
    end
    return "[combine:"..width.."x16"..out, width
end

function ns.read_file(path)
    local f = io.open(path)
    if not f then return false end
    local out = f:read("a")
    f:close()
    return out
end

function ns.manhattan_distance(a, b)
    return math.abs(b.x -a.x) +math.abs(b.y -a.y) +math.abs(b.z -a.z)
end

minetest.register_lbm {
    name = ":firefly:on_load",
    nodenames = {"group:call_on_load"},
    action = function(pos, node)
        minetest.registered_nodes[node.name].on_load(pos)
    end
}

ns.timer = EventTarget()

local last_time = minetest.get_us_time()
minetest.register_globalstep(function()
    local time = minetest.get_us_time()
    if time -last_time > 1000000 then
        ns.timer:dispatch("every_second")
        last_time = time
    end 
end)

minetest.register_entity(":display", {
    initial_properties = {
        visual = "sprite",
        textures = {"blank.png"},
        pointable = false,
        static_save = false
    },
    on_activate = function(e)
        e.object:set_armor_groups{immortal = 1}
    end
})


if minetest.get_modpath("testtools") then
    minetest.override_item("testtools:param2tool", {
        pointabilities = {
            nodes = {["group:everything"] = true},
            objects = {["group:immortal"] = false}
        }
    })
end