local json = require "lib.json"

local M = {}

function M.get_palette()
    local f = io.open("palette.json", "r")
    if not f then error("couldn't open palette.json") end
    local data = f:read("a")
    f:close()
    return json.decode(data)
end

-- This is taken from http://lua-users.org/wiki/SortedIteration
-- This version is stripped of comments and empty lines + some stuff is renamed

local function __gen_oindex(t)
    local oindex = {}
    for key in pairs(t) do
        table.insert(oindex, key)
    end
    table.sort(oindex)
    return oindex
end

function M.onext(t, state)
    local key = nil
    if state == nil then
        t.__oindex = __gen_oindex(t)
        key = t.__oindex[1]
    else
        for i = 1, #t.__oindex do
            if t.__oindex[i] == state then
                key = t.__oindex[i + 1]
            end
        end
    end
    if key then
        return key, t[key]
    end
    t.__oindex = nil
end

function M.opairs(t)
    return M.onext, t, nil
end

return M