ardour {
    ["type"] = "EditorAction",
    name = "Mixer Store",
    author = "Ardour Lua Taskforce",
    description = [[Stores the current Mixer state as a file that can be recalled arbitrarily. Supports: processor settings, gain, trim, pan and processor ordering.]]
}

function factory() return function()

    local path = ARDOUR.LuaAPI.build_filename(Session:path(), "export", "params.lua")
    function mark()
        local file = io.open(path, "w")
        file:write("") --empty current file from last run
        file:close()
        for r in Session:get_routes():iter() do
            if r:is_monitor () or r:is_auditioner () then goto nextroute end -- skip special routes

            local order = ARDOUR.ProcessorList()
            local x = 0
            repeat
                local proc = r:nth_processor(x)
                if not proc:isnil() then
                    order:push_back(proc)
                end
                x = x + 1
            until proc:isnil()

            local route_str, proc_order_str = "", ""
            local rid = r:to_stateful():id():to_s()
            local pan = r:pan_azimuth_control()
            if pan:isnil() then pan = false else pan = pan:get_value() end --sometimes a route doesn't have pan, like the master.

            local on = 0
            for p in order:iter() do
                local pid = p:to_stateful():id():to_s()
                proc_order_str = proc_order_str .. "[" .. on .. "] = " .. pid ..","
                on = on + 1
            end

            route_str = "instance = {route_id = " .. rid .. ", gain_control = " .. r:gain_control():get_value() .. ", trim_control = " .. r:trim_control():get_value() .. ", pan_control = " .. tostring(pan) .. ", order = {" .. proc_order_str .."}" .. "}"
            file = io.open(path, "a")
            file:write(route_str, "\r\n")
            file:close()

            local i = 0
            while true do
                local params = {}
                local proc_str, params_str = "", ""
                local proc = r:nth_plugin (i)
                if proc:isnil () then break end
                local active = proc:active()
                local id = proc:to_stateful():id():to_s()
                local plug = proc:to_insert ():plugin (0)
                local n = 0 -- count control-ports
                for j = 0, plug:parameter_count () - 1 do -- iterate over all plugin parameters
                    if plug:parameter_is_control (j) then
                        local label = plug:parameter_label (j)
                        if plug:parameter_is_input (j) and label ~= "hidden" and label:sub (1,1) ~= "#" then
                            local _, _, pd = ARDOUR.LuaAPI.plugin_automation(proc, n)
                            local val = ARDOUR.LuaAPI.get_processor_param(proc, j, true)
                            if not(val == pd.normal) then
                                params[n] = val
                            end
                        end
                        n = n + 1
                    end
                end
                i = i + 1
                for k, v in pairs(params) do
                    params_str = params_str .. "[".. k .."] = " .. v .. ","
                end
                proc_str = "instance = {plugin_id = " .. id .. ", parameters = {" .. params_str .. "}, active = " .. tostring(active) .. "}"
                file = io.open(path, "a")
                file:write(proc_str, "\r\n")
                file:close()
            end
            ::nextroute::
        end
    end

    function recall()
        local file = io.open(path, "r")
        assert(file, "File not found!")
        for l in file:lines() do

            local plugin, route = false, false
            local f = load(l)
            f ()

            if instance["route_id"]  ~= nil then route = true end
            if instance["plugin_id"] ~= nil then plugin = true end

            if route then
                local old_order = ARDOUR.ProcessorList()
                for k, v in pairs(instance["order"]) do
                    local proc = Session:processor_by_id(PBD.ID(v))
                    if not(proc:isnil()) then old_order:push_back(proc) end
                end
                local rid = PBD.ID(instance["route_id"])
                local rt = Session:route_by_id(rid)
                if rt:isnil() then goto nextline end
                local gc, tc, pc = instance["gain_control"], instance["trim_control"], instance["pan_control"]
                rt:gain_control():set_value(gc, 1)
                rt:trim_control():set_value(tc, 1)
                if pc ~= false then rt:pan_azimuth_control():set_value(pc, 1) end
                rt:reorder_processors(old_order, nil)
            end

            if plugin then
                local act = instance["active"]
                local id = PBD.ID(instance["plugin_id"])
                local proc = Session:processor_by_id(id)
                if proc:isnil() then goto nextline end
                for k, v in pairs(instance["parameters"]) do
                    ARDOUR.LuaAPI.set_processor_param(proc, k, v)
                end
                if act then proc:activate() else proc:deactivate() end
            end
            ::nextline::
        end
    end

    local dialog_options = {
        { type = "label", colspan= 10, title = "" },
        { type = "radio",  colspan= 10, key = "select", title = "", values ={ ["1. Mark"] = "mark", ["2. Recall"] = "recall" }, default = "1. Mark"},
        { type = "label", colspan= 10, title = "" },
    }

    local rv = LuaDialog.Dialog("Mixer Store:", dialog_options):run()
    assert(rv, 'Dialog box was canceled or is ' .. type(rv))
    local c = rv["select"]
    if c == "mark" then mark() end
    if c == "recall" then recall() end

end end