local marker_lookup, gui = ...;

-- Generates formspec data for the map marker editor
-- selected_id: The id of the currently selected marker, or nil if no marker is
--              selected
-- detail: The map's detail level
-- page: The current page
-- bg: A 9-slice background skin table
-- button: A button skin table
--
-- Returns a formspec string for use in containers
local function generate_marker_formspec(selected_id, detail, page, bg, button)
    local formspec = {
        gui.bg9 {
            x = 0,
            y = 0,

            w = 3.25,
            h = 3.875,

            skin = bg,
        },
        gui.style_type {
            selector = "button,image_button",
            properties = {
                border = false,
                bgimg = button.texture .. ".png",
                bgimg_hovered = button.hovered_texture .. ".png",
                bgimg_pressed = button.pressed_texture .. ".png",
                bgimg_middle = button.radius,
                textcolor = button.font_color,
            },
        },
        gui.button {
            x = 0.125,
            y = 0.125,

            w = 1.125,
            h = 0.5,

            id = "clear_marker",
            text = "Erase",
            tooltip = "Remove the selected marker",
        },

        gui.label {
            x = 1.375,
            y = 3.5,

            text = string.format("%d / %d", page, math.ceil(#marker_lookup / 20)),
        },
    };

    if selected_id then
        table.insert(formspec, gui.style {
            selector = "marker-" .. selected_id,
            properties = {
                bgimg = button.selected_texture .. ".png",
                bgimg_hovered = button.selected_texture .. ".png",
                bgimg_pressed = button.selected_texture .. ".png",
            }
        });
    end

    local starting_id = ((page - 1) * 20) + 1;
    for i = starting_id,math.min(#marker_lookup,starting_id + 19),1 do
        local marker = marker_lookup[i];
        table.insert(formspec, gui.image_button {
            x = (i - starting_id) % 5 * 0.625 + 0.125,
            y = math.floor((i - starting_id) / 5) * 0.625 + 0.75,

            w = 0.5,
            h = 0.5,

            image = marker.textures[math.min(detail, #marker.textures)] .. ".png",
            id = "marker-" .. marker.id,
            tooltip = marker.name,
        });
    end

    if page > 1 then
        table.insert(formspec, gui.button {
            x = 0.125,
            y = 3.25,

            w = 0.5,
            h = 0.5,

            id = "prev_button",
            text = "<"
        });
    end

    if starting_id + 19 < #marker_lookup then
        table.insert(formspec, gui.button {
            x = 2.625,
            y = 3.25,

            w = 0.5,
            h = 0.5,

            id = "next_button",
            text = ">"
        });
    end

    return table.concat(formspec);
end

return generate_marker_formspec;