local map_editor_state = {
    map = {},
    world = {},
    ui = {},

    selected_tile = false
}

local map_editor_scene_menu_options = {
    false,
    {
        texture = TEXTURES.NEW_GAME_HEX,
        action = function()
            win.scene:remove("menu")
            game_init()
        end
    },
    false,
    {
        texture = TEXTURES.SAVE_GAME_HEX,
        action = function()
            game_save()
            gui_alert("succesfully saved!")
        end
    },
    false,
    {
        texture = TEXTURES.LOAD_GAME_HEX,
        action = function()
            local save = am.load_state("save", "json")

            if save then
                win.scene:remove("menu")
                game_init(save)
            else
                gui_alert("no saved games")
            end
        end
    },
    {
        texture = TEXTURES.MAP_EDITOR_HEX,
        action = function()
            map_editor_init(game_state and game_state.map and game_state.map.seed)
        end
    },
    {
        texture = TEXTURES.UNPAUSE_HEX,
        action = function()
            win.scene:remove("menu")
            win.scene("context").paused = false
        end,
        keys = {
            "escape"
        }
    },
    {
        texture = TEXTURES.SETTINGS_HEX,
        action = function()
            gui_alert("not yet :)")
        end
    },
    {
        texture = TEXTURES.QUIT_HEX,
        action = function()
            win:close()
        end,
        keys = {
            "f4"
        }
    },
    false
}

local function deselect_tile()
    map_editor_state.selected_tile = false
    win.scene:remove("tile_select_box")
end

function map_editor_action()
    local mouse         = win:mouse_position()
    local hex           = pixel_to_hex(mouse - WORLDSPACE_COORDINATE_OFFSET, vec2(HEX_SIZE))
    local rounded_mouse = hex_to_pixel(hex, vec2(HEX_SIZE)) + WORLDSPACE_COORDINATE_OFFSET
    local evenq         = hex_to_evenq(hex)
    local tile          = hex_map_get(map_editor_state.map, hex)
    local interactable  = evenq_is_in_interactable_region(evenq{ y = -evenq.y })

    if win:key_pressed"escape" then
        win.scene("map_editor").paused = true
        win.scene:append(make_scene_menu(map_editor_scene_menu_options, nil, true))
    end

    if win:mouse_down"left" then
        deselect_tile()

        map_editor_state.selected_tile = tile
        win.scene:append((
                am.translate(rounded_mouse)
                ^ pack_texture_into_sprite(TEXTURES.SELECT_BOX, HEX_SIZE*2, HEX_SIZE*2, COLORS.SUNRAY)
            )
            :tag"tile_select_box"
        )
    end

    if map_editor_state.selected_tile then
        if win:key_down"a" then
            -- make the selected tile 'mountain'
            map_editor_state.selected_tile.elevation = 0.75
            --map_editor_state.selected_tile.node("circle").color = map_elevation_color(map_editor_state.selected_tile.elevation)

        elseif win:key_down"w" then
            -- make the selected tile 'water'
            map_editor_state.selected_tile.elevation = -0.75
            --map_editor_state.selected_tile.node("circle").color = map_elevation_color(map_editor_state.selected_tile.elevation)

        elseif win:key_down"d" then
            -- make the selected tile 'dirt'
            map_editor_state.selected_tile.elevation = 0.25
            --map_editor_state.selected_tile.node("circle").color = map_elevation_color(map_editor_state.selected_tile.elevation)

        elseif win:key_down"g" then
            -- make the selected tile 'grass'
            map_editor_state.selected_tile.elevation = -0.25
            --map_editor_state.selected_tile.node("circle").color = map_elevation_color(map_editor_state.selected_tile.elevation)
        end

        -- fine tune tile's elevation with mouse wheel
        local mouse_wheel_delta = win:mouse_wheel_delta().y / 100
        if map_editor_state.selected_tile and mouse_wheel_delta ~= 0 then
            map_editor_state.selected_tile.elevation = math.clamp(map_editor_state.selected_tile.elevation + mouse_wheel_delta, -1, 1 - math.SMALLEST_NUMBER_ABOVE_0)
            --map_editor_state.selected_tile.node("circle").color = map_elevation_color(map_editor_state.selected_tile.elevation)
        end
    end

    -- update the cursor
    if not interactable then
        win.scene("cursor").hidden = true

    else
        win.scene("cursor").hidden = false
        win.scene("cursor_translate").position2d = rounded_mouse
    end

    if tile then
        win.scene("top_right_display").text = string.format(
            "raw elevation value: %.2f\ntile type: %s",
            tile.elevation, map_elevation_to_tile_type(tile.elevation)
        )
    end
end

function map_editor_init()
    -- remove existing map_editor scene from the graph if it's there
    local map_editor_scene = am.group():tag"map_editor"
    map_editor_scene:late_action(map_editor_action)

    map_editor_state.map = default_map_editor_map(1)
    map_editor_state.world = make_hex_grid_scene(map_editor_state.map, false)
    map_editor_state.ui = am.group(
        am.translate(HEX_GRID_CENTER):tag"cursor_translate"
        ^ make_hex_cursor_node(0, COLORS.TRANSPARENT):tag"cursor",
        make_top_right_display_node()
    )

    -- add the top level nodes to the scene
    map_editor_scene:append(map_editor_state.world)
    map_editor_scene:append(map_editor_state.ui)

    -- add the scene to the window
    switch_context(map_editor_scene)
end