local plugin_loader = {}

local utils = require "utils"
local Log = require "core.log"
-- we need to reuse this outside of init()
local compile_path = get_config_dir() .. "/plugin/packer_compiled.lua"

local _, packer = pcall(require, "packer")

function plugin_loader.init(opts)
  opts = opts or {}

  local install_path = opts.install_path
    or vim.fn.stdpath "data" .. "/site/pack/packer/start/packer.nvim"
  local package_root = opts.package_root or vim.fn.stdpath "data" .. "/site/pack"

  if vim.fn.empty(vim.fn.glob(install_path)) > 0 then
    vim.fn.system {
      "git",
      "clone",
      "--depth",
      "1",
      "https://github.com/wbthomason/packer.nvim",
      install_path,
    }
    vim.cmd "packadd packer.nvim"
  end

  packer.init {
    package_root = package_root,
    compile_path = compile_path,
    log = { level = "warn" },
    git = { clone_timeout = 300 },
    display = {
      open_fn = function()
        return require("packer.util").float { border = "rounded" }
      end,
    },
  }
end

-- packer expects a space separated list
local function pcall_packer_command(cmd, kwargs)
  local status_ok, msg = pcall(function()
    require("packer")[cmd](unpack(kwargs or {}))
  end)
  if not status_ok then
    Log:warn(cmd .. " failed with: " .. vim.inspect(msg))
    Log:trace(vim.inspect(vim.fn.eval "v:errmsg"))
  end
end

function plugin_loader.cache_clear()
  if vim.fn.delete(compile_path) == 0 then
    Log:debug "deleted packer_compiled.lua"
  end
end

function plugin_loader.recompile()
  plugin_loader.cache_clear()
  pcall_packer_command "compile"
  if utils.is_file(compile_path) then
    Log:debug "generated packer_compiled.lua"
  end
end

function plugin_loader.load(configurations)
  Log:debug "loading plugins configuration"
  local status_ok, _ = xpcall(function()
    packer.startup(function(use)
      for _, plugins in ipairs(configurations) do
        for _, plugin in ipairs(plugins) do
          use(plugin)
        end
      end
    end)
  end, debug.traceback)
  if not status_ok then
    Log:warn "problems detected while loading plugins' configurations"
    Log:trace(debug.traceback())
  end
end

function plugin_loader.get_core_plugins()
  local list = {}
  local plugins = require "plugins"
  for _, item in pairs(plugins) do
    table.insert(list, item[1]:match "/(%S*)")
  end
  return list
end

function plugin_loader.sync_core_plugins()
  local core_plugins = plugin_loader.get_core_plugins()
  Log:trace(
    string.format("Syncing core plugins: [%q]", table.concat(core_plugins, ", "))
  )
  pcall_packer_command("sync", core_plugins)
end

return plugin_loader