local M = {}

function M.themeselector()
    vim.api.nvim_exec_autocmds("User", { pattern = "ThemeSwitcher", modeline = false })

    local configDir = vim.fn.stdpath("config")
    local prefsFile = configDir .. "/lua/taken/prefs.lua"
    local oldstring = 'M.colorscheme = .*"'

    local colors = vim.fn.globpath(vim.o.rtp, "colors/*", 1, 1)
    local dataDir = vim.fn.stdpath("data")
    local newpath = string.gsub(dataDir, "%-", "%%-")
    local themes = {}

    for i, v in ipairs(colors) do
        if string.find(v, "lazy") then
            local filename = string.gsub(v, newpath .. "\\lazy\\.*\\", "")
            local themename = string.gsub(filename, ".vim", "")
            local themename2 = string.gsub(themename, ".lua", "")

            table.insert(themes, themename2)
        end
    end

    local opts = {
        prompt = "Select a theme",
    }

    local function change_theme(old, new)
        -- function from nvchad
        local file = io.open(prefsFile, "r")
        local added_pattern = string.gsub(old, "-", "%%-")
        local new_content = file:read("*all"):gsub(added_pattern, new)

        file = io.open(prefsFile, "w")
        file:write(new_content)
        file:close()
    end

    local exec = function(choice)
        if choice == nil then
            vim.notify("No theme selected!")
            return
        end

        vim.cmd("colorscheme " .. choice)
        local newstring = 'M.colorscheme = "' .. choice .. '"'
        change_theme(oldstring, newstring)

        local cursorcolumncolor = vim.fn.synIDattr(vim.fn.hlID("CursorColumn"), "bg")
        vim.cmd("hi CursorLine guibg=" .. cursorcolumncolor)
    end

    vim.ui.select(themes, opts, exec)
end

return M