local M = {}

---@return string
M.improved_encoding = function()
    local encoding = vim.opt.fileencoding:get()
    if encoding == "utf-8" then
        encoding = "UTF-8"
    elseif encoding == "cp932" then
        encoding = "SHIFT-JIS"
    elseif encoding == "euc-jp" then
        encoding = "EUC-JP"
    else
        encoding = encoding
    end
    return encoding
end

---@return table|nil
M.diff_source = function()
    local gitsigns = vim.b.gitsigns_status_dict
    if gitsigns then
        return {
            added = gitsigns.added,
            modified = gitsigns.changed,
            removed = gitsigns.removed,
        }
    end
end

---@return string|nil
M.eskk_mode = function()
    if vim.fn["eskk#is_enabled"]() then
        ---@type string
        local get_mode = vim.fn["eskk#get_mode"]()
        return get_mode
    end
end

---@return string
M.special_notice = function()
    local special_msg = "コロナを忘れるな！"
    return special_msg
end

---@return table|nil
M.copilot_or_nothing = function()
    if require("config.settings").use_github_copilot then
        return {
            "copilot",
            symbols = {
                status = {
                    icons = {
                        enabled = " ",
                        sleep = " ",
                        disabled = " ",
                        warning = " ",
                        unknown = " ",
                    },
                    hl = {
                        enabled = "#50FA7B",
                        sleep = "#AEB7D0",
                        disabled = "#6272A4",
                        warning = "#FFB86C",
                        unknown = "#FF5555",
                    },
                },
                spinners = require("copilot-lualine.spinners").dots,
                spinner_color = "#6272A4",
            },
            show_colors = false,
            show_loading = true,
        }
    end
end

---@return table|nil
M.aerial_parts = function()
    return {
        "aerial",
        sep = " ) ",
        depth = nil,
        dense = false,
        dense_sep = ".",
        colored = true,
    }
end

---@return table|nil
M.mcphub_or_nothing = function()
    if require("config.settings").use_llm then
        return require("mcphub.extensions.lualine")
    end
end

return M