-- env fileread
local util = require("go.utils")
local log = util.log
local M = {}
local vfn = vim.fn
local sep = require("go.utils").sep()

function M.envfile(f)
  local workfolder = vim.lsp.buf.list_workspace_folders()[1] or vfn.getcwd()
  local goenv = workfolder .. sep .. (f or ".env")

  if vfn.filereadable(goenv) == 1 then
    return goenv
  end
end

function M.append(env, val)
  local oldval = vfn.getenv(env)
  if val == vim.NIL or string.find(oldval, val) then
    return
  end
  if oldval == vim.NIL then
    util.notify("failed to get env var: " .. env)
  end
  if oldval:find(val) then -- presented
    return
  end
  local newval = oldval .. ":" .. val
  vfn.setenv(env, newval)
end

function M.load_env(env, setToEnv)
  setToEnv = setToEnv or true
  env = env or M.envfile()
  if vfn.filereadable(env) == 0 then
    return false
  end
  local lines = util.lines_from(env)
  local envs = {}
  for _, line in ipairs(lines) do
    for k, v in string.gmatch(line, "([%w_]+)=([%w%c%p%z]+)") do
      envs[k] = v
    end
  end

  log(envs)
  if setToEnv then
    for key, val in pairs(envs) do
      vfn.setenv(key, val)
    end
  end

  return envs
end

-- best effort to enabl $GOBIN
function M.setup()
  local home = "HOME"
  if util.is_windows() then
    home = "USERPROFILE"
  end
  local gohome = vfn.getenv("GOHOME")
  local gobin = vfn.getenv("GOBIN")
  local user_home = vfn.getenv(home)
  if gobin == vim.NIL then
    if gohome == vim.NIL then
      if user_home == vim.NIL then
        util.notify("failed to setup $GOBIN")
        return
      end
      gobin = user_home .. sep .. "go" .. sep .. "bin"
    else
      local gohome1 = vim.split(gohome, ":")[1]
      gobin = gohome1 .. require("go.utils").sep() .. "bin"
      vfn.setenv("GOBIN", gobin)
    end
  end
  M.append("PATH", gobin)
end

return M