local M = {}

function M.themeselector(opts)
    local pickers = require("telescope.pickers")
    local finders = require("telescope.finders")
    local conf = require("telescope.config").values
    local actions = require("telescope.actions")
    local action_state = require("telescope.actions.state")
    local action_set = require("telescope.actions.set")

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

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

    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 = ""
            if vim.loop.os_uname().sysname == "Windows_NT" then
                filename = string.gsub(v, newpath .. "\\lazy\\.*\\", "")
            else
                filename = string.gsub(v, newpath .. "/lazy/.*/", "")
            end
            local themename = string.gsub(filename, ".vim", "")
            local themename2 = string.gsub(themename, ".lua", "")

            table.insert(themes, themename2)
        end
    end

    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!", 4)
            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")
        if cursorcolumncolor ~= "" then
            vim.cmd("hi CursorLine guibg=" .. cursorcolumncolor)
        end
    end

    opts = opts or {}
    pickers
        .new(opts, {
            prompt_title = "Colorscheme",
            finder = finders.new_table({
                results = themes,
            }),
            sorter = conf.generic_sorter(opts),
            attach_mappings = function(prompt_bufnr)
                actions.select_default:replace(function()
                    actions.close(prompt_bufnr)
                    local selection = action_state.get_selected_entry()
                    exec(selection.value)
                end)
                action_set.shift_selection:enhance({
                    post = function()
                        local selection = action_state.get_selected_entry()
                        if selection == nil then
                            vim.notify("Error while selecting theme", vim.log.levels.ERROR)
                        end
                        vim.cmd("colorscheme " .. selection.value)
                    end,
                })
                -- actions.close:enhance({
                --     post = function()
                --         local selection = action_state.get_selected_entry()
                --         if selection == nil then
                --             vim.notify("Error while selecting theme", vim.log.levels.ERROR)
                --         end
                --         exec(selection.value)
                --     end,
                -- })
                return true
            end,
        })
        :find()
end

return M