# This file used to implement (partially) old plans for granular ACLs.
# It now retains only the minimum needed to keep new documents openable by old code,
# and to produce the ActionBundles expected by other code.

import json

from acl_formula import parse_acl_grist_entities, parse_acl_formula_json
import action_obj
import logger
import textbuilder

log = logger.Logger(__name__, logger.INFO)


class Permissions(object):
  # Permission types and their combination are represented as bits of a single integer.
  VIEW          = 0x1
  UPDATE        = 0x2
  ADD           = 0x4
  REMOVE        = 0x8
  SCHEMA_EDIT   = 0x10
  ACL_EDIT      = 0x20
  EDITOR        = VIEW | UPDATE | ADD | REMOVE
  ADMIN         = EDITOR | SCHEMA_EDIT
  OWNER         = ADMIN | ACL_EDIT


# Special recipients, or instanceIds. ALL is the special recipient for schema actions that
# should be shared with all collaborators of the document.
ALL = '#ALL'
ALL_SET = frozenset([ALL])


def acl_read_split(action_group):
  """
  Returns an ActionBundle containing actions from the given action_group, all in one envelope.
  With the deprecation of old-style ACL rules, envelopes are not used at all, and only kept to
  avoid triggering unrelated code changes.
  """
  bundle = action_obj.ActionBundle()
  bundle.envelopes.append(action_obj.Envelope(ALL_SET))
  bundle.stored.extend((0, da) for da in action_group.stored)
  bundle.direct.extend((0, flag) for flag in action_group.direct)
  bundle.calc.extend((0, da) for da in action_group.calc)
  bundle.undo.extend((0, da) for da in action_group.undo)
  bundle.retValues = action_group.retValues
  return bundle


def prepare_acl_table_renames(docmodel, useractions, table_renames_dict):
  """
  Given a dict of table renames of the form {table_id: new_table_id}, returns a callback
  that will apply updates to the affected ACL rules and resources.
  """
  # If there are ACLResources that refer to the renamed table, prepare updates for those.
  resource_updates = []
  for resource_rec in docmodel.aclResources.all:
    if resource_rec.tableId in table_renames_dict:
      resource_updates.append((resource_rec, {'tableId': table_renames_dict[resource_rec.tableId]}))

  # Collect updates for any ACLRules with UserAttributes that refer to the renamed table.
  rule_updates = []
  for rule_rec in docmodel.aclRules.all:
    if rule_rec.userAttributes:
      try:
        rule_info = json.loads(rule_rec.userAttributes)
        if rule_info.get("tableId") in table_renames_dict:
          rule_info["tableId"] = table_renames_dict[rule_info.get("tableId")]
          rule_updates.append((rule_rec, {'userAttributes': json.dumps(rule_info)}))
      except Exception, e:
        log.warn("Error examining aclRule: %s" % (e,))

  def do_renames():
    useractions.doBulkUpdateFromPairs('_grist_ACLResources', resource_updates)
    useractions.doBulkUpdateFromPairs('_grist_ACLRules', rule_updates)
  return do_renames


def prepare_acl_col_renames(docmodel, useractions, col_renames_dict):
  """
  Given a dict of column renames of the form {(table_id, col_id): new_col_id}, returns a callback
  that will apply updates to the affected ACL rules and resources.
  """
  # Collect updates for ACLResources that refer to the renamed columns.
  resource_updates = []
  for resource_rec in docmodel.aclResources.all:
    t = resource_rec.tableId
    if resource_rec.colIds and resource_rec.colIds != '*':
      new_col_ids = ','.join((col_renames_dict.get((t, c)) or c)
                             for c in resource_rec.colIds.split(','))
      if new_col_ids != resource_rec.colIds:
        resource_updates.append((resource_rec, {'colIds': new_col_ids}))

  # Collect updates for any ACLRules with UserAttributes that refer to the renamed column.
  rule_updates = []
  user_attr_tables = {}   # Maps name of user attribute to its lookup table
  for rule_rec in docmodel.aclRules.all:
    if rule_rec.userAttributes:
      try:
        rule_info = json.loads(rule_rec.userAttributes)
        user_attr_tables[rule_info.get('name')] = rule_info.get('tableId')
        new_col_id = col_renames_dict.get((rule_info.get("tableId"), rule_info.get("lookupColId")))
        if new_col_id:
          rule_info["lookupColId"] = new_col_id
          rule_updates.append((rule_rec, {'userAttributes': json.dumps(rule_info)}))
      except Exception, e:
        log.warn("Error examining aclRule: %s" % (e,))

  # Go through again checking if anything in ACL formulas is affected by the rename.
  for rule_rec in docmodel.aclRules.all:
    if rule_rec.aclFormula:
      # Positions are obtained from unicode version of formulas, so that's what we must patch
      formula = rule_rec.aclFormula.decode('utf8')
      patches = []

      for entity in parse_acl_grist_entities(rule_rec.aclFormula):
        if entity.type == 'recCol':
          table_id = docmodel.aclResources.table.get_record(int(rule_rec.resource)).tableId
        elif entity.type == 'userAttrCol':
          table_id = user_attr_tables.get(entity.extra)
        else:
          continue
        col_id = entity.name
        new_col_id = col_renames_dict.get((table_id, col_id))
        if not new_col_id:
          continue
        patch = textbuilder.make_patch(
            formula, entity.start_pos, entity.start_pos + len(entity.name), new_col_id)
        patches.append(patch)

      replacer = textbuilder.Replacer(textbuilder.Text(formula), patches)
      txt = replacer.get_text().encode('utf8')
      rule_updates.append((rule_rec, {'aclFormula': txt,
                                      'aclFormulaParsed': parse_acl_formula_json(txt)}))

  def do_renames():
    useractions.doBulkUpdateFromPairs('_grist_ACLResources', resource_updates)
    useractions.doBulkUpdateFromPairs('_grist_ACLRules', rule_updates)
  return do_renames