local present, base46 = pcall(require, "base46")
if not present or not base46._DMS_SUPPORT then
    vim.notify(
        "base46 plugin not found or incorrect, make sure to install AvengeMedia/base46",
        vim.log.levels.ERROR,
        { title = "matugen integration" }
    )
    return
end

local config_home = vim.env.XDG_CONFIG_HOME
if config_home == nil or #config_home == 0 then
    config_home = vim.fs.joinpath(vim.env.HOME, ".config")
end

local colors_file_path = vim.fs.joinpath(config_home, "neovim", "nvim-colors.json")
local colors_file = io.open(colors_file_path, "r")
if colors_file == nil then
    vim.notify(
        "cannnot read matugen colors file at '" .. colors_file_path .. "'",
        vim.log.levels.ERROR,
        { title = "matugen integration" }
    )
    return
end
local colors = vim.json.decode(colors_file:read("*a"))
colors_file:close()

local mode = colors.mode

local settings = { matugenTemplateNeovimSetBackground = true }

local theme_base = ("github_" .. vim.o.background)
local harmony = 0.2
local theme_name = "matugen"

if mode ~= nil then
    if mode:match("light") then
        vim.o.background = "light"
        theme_base = "flex-light"
    elseif mode:match("dark") then
        vim.o.background = "dark"
        theme_base = "ashes"
    end
end

if not _G._matugen_theme_watcher then
    local uv = vim.uv or vim.loop
    _G._matugen_theme_watcher = { uv.new_fs_event(), reload_timer = uv.new_timer() }

    local debounce_time = 100 -- ms
    local function handler()
        _G._matugen_theme_watcher.reload_timer:stop()
        _G._matugen_theme_watcher.reload_timer:start(
            debounce_time,
            0,
            vim.schedule_wrap(function()
                base46.theme_tables[theme_name] = nil
                if vim.g.colors_name == theme_name then
                    vim.cmd.colorscheme(theme_name)
                end
                _G._matugen_theme_watcher[1]:stop()
                _G._matugen_theme_watcher[1]:start(colors_file_path, {}, handler)
            end)
        )
    end
    _G._matugen_theme_watcher[1]:start(colors_file_path, {}, handler)
end

if not base46.theme_tables[theme_name] or base46.theme_tables[theme_name].type ~= vim.o.background then
    local builtin = vim.deepcopy(assert(base46.get_builtin_theme(theme_base)))
    local harmonized = base46.theme_harmonize(builtin, colors.source_color, harmony)
    if settings.matugenTemplateNeovimSetBackground ~= false then
        harmonized = base46.theme_set_bg(harmonized, colors.background)
    end

    base46.theme_tables[theme_name] = harmonized
end

base46.load(theme_name)
vim.g.colors_name = theme_name