local utils = require("utils")

local oil = nil
local oil_window = nil

local function lock_oil_buf_to_window(bufnr)
    local augroup_id = vim.api.nvim_create_augroup("LockOil" .. oil_window, { clear = true })

    -- Create an autocommand group to manage the buffer lock
    vim.api.nvim_create_autocmd("BufEnter", {
        group = augroup_id,
        callback = function()
            local current_win = vim.api.nvim_get_current_win()
            if current_win ~= oil_window then
                return
            end

            local current_buf = vim.api.nvim_win_get_buf(oil_window)
            if current_buf == bufnr then
                return
            end

            if utils.is_buf_filetype(current_buf, "oil") then
                bufnr = current_buf
                return
            end

            vim.api.nvim_win_set_buf(oil_window, bufnr)
        end,
    })
end

local function toggle_oil_window()
    if oil_window and vim.api.nvim_win_is_valid(oil_window) then
        vim.api.nvim_win_close(oil_window, true)
        oil_window = nil
        return
    end

    -- Calculate the desired width (e.g., 20% of the terminal width)
    local term_width = vim.api.nvim_get_option("columns")
    local width_percentage = 0.175
    local min_width = 30
    local max_width = 50
    local calculated_width = math.floor(term_width * width_percentage)
    local final_width = math.min(math.max(calculated_width, min_width), max_width)

    -- Open a vertical split with the calculated width on the left and open oil.nvim
    vim.cmd("topleft vertical " .. final_width .. "vnew")
    oil_window = vim.api.nvim_get_current_win()
    vim.api.nvim_win_set_option(oil_window, "winfixwidth", true)

    vim.api.nvim_win_set_option(oil_window, "winhighlight",
        "Normal:Utility,FloatBorder:Utility")

    oil.open()
    local oil_buf_id = vim.api.nvim_get_current_buf()
    lock_oil_buf_to_window(oil_buf_id)
end

return {
    "stevearc/oil.nvim",
    config = function()
        oil = require("oil")
        oil.setup({
            view_options = {
                show_hidden = true,
            },
            win_options = {
                wrap = true,
                signcolumn = "no",
                cursorcolumn = false,
                foldcolumn = "0",
                spell = false,
                list = false,
                conceallevel = 3,
                concealcursor = "nvic",
            },
        })

        require("utils").add_keymaps({
            n = {
                ["<leader>o"] = {
                    cmd = toggle_oil_window,
                }
            }
        })
    end,
}