refactor: massive file restructure

lua/cp/restore.lua

@@ -0,0 +1,45 @@
+local M = {}
+
+local cache = require('cp.cache')
+local logger = require('cp.log')
+local state = require('cp.state')
+
+function M.restore_from_current_file()
+  local current_file = vim.fn.expand('%:p')
+  if current_file == '' then
+    logger.log('No file is currently open', vim.log.levels.ERROR)
+    return false
+  end
+
+  cache.load()
+  local file_state = cache.get_file_state(current_file)
+  if not file_state then
+    logger.log(
+      'No cached state found for current file. Use :CP <platform> <contest> <problem> first.',
+      vim.log.levels.ERROR
+    )
+    return false
+  end
+
+  logger.log(
+    ('Restoring from cached state: %s %s %s'):format(
+      file_state.platform,
+      file_state.contest_id,
+      file_state.problem_id or 'N/A'
+    )
+  )
+
+  local setup = require('cp.setup')
+  if not setup.set_platform(file_state.platform) then
+    return false
+  end
+
+  state.set_contest_id(file_state.contest_id)
+  state.set_problem_id(file_state.problem_id)
+
+  setup.setup_problem(file_state.contest_id, file_state.problem_id, file_state.language)
+
+  return true
+end
+
+return M