-------------------------------------------------------------------------------
-- Tools to deal with the plan file
-------------------------------------------------------------------------------
local Plan = {}

local Configuration = require('configuration')
local Util = require('util')
-------------------------------------------------------------------------------
-- Internal Functions
-------------------------------------------------------------------------------
local function open_or_create_from_template(file_path, force_template)

  local plan_file = io.open(file_path, 'r')
  if force_template or not plan_file then
    local template_contents = Configuration.load_template('plan')
    local date = os.date('%Y-%m-%d')

    template_contents = template_contents .. '[' .. date .. ']\n'
    plan_file = io.open(file_path, 'w')
    plan_file:write(template_contents)
    plan_file:close()
  end
  vim.cmd('edit ' .. file_path)
end

local function copy(plan_path, archive_path)
  local plan_file = io.open(plan_path, 'r')
  local archive_file = io.open(archive_path, 'wb')
  local plan_content = plan_file:read('*a')
  archive_file:write(plan_content) -- Write the content to the target file

  plan_file:close()
  archive_file:close()
end

-------------------------------------------------------------------------------
-- Public Interface
-------------------------------------------------------------------------------

--- Opens the active plan file
function Plan.open(force_template)
  local plan_path = vim.fn.expand(Configuration.configuration.plan.plan_file)
  local plan_parent = Util.directory_name(plan_path)
  Util.ensure_directory_exists(plan_parent)
  open_or_create_from_template(plan_path, force_template)
end

--- Capture a new plan file and archive the current one
function Plan.capture()
  local fs = vim.loop

  local plan_path = vim.fn.expand(Configuration.configuration.plan.plan_file)
  local plan_parent = Util.directory_name(plan_path)
  Util.ensure_directory_exists(plan_parent)

  local archive_path = Configuration.path_for(Configuration.configuration.plan.archive)
  Util.ensure_directory_exists(archive_path)

  if fs.fs_stat(plan_path) then
    local archive_filename = os.date('%Y-%m-%d') .. '.md'
    copy(plan_path, Util.join(archive_path, archive_filename))
  end

  Plan.open(true)
end

return Plan