text: # Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
  # License: MIT. See LICENSE
  
  # model __init__.py
  import frappe
  
  data_fieldtypes = (
  	'Currency',
  	'Int',
  	'Long Int',
  	'Float',
  	'Percent',
  	'Check',
  	'Small Text',
  	'Long Text',
  	'Code',
  	'Text Editor',
  	'Markdown Editor',
  	'HTML Editor',
  	'Date',
  	'Datetime',
  	'Time',
  	'Text',
  	'Data',
  	'Link',
  	'Dynamic Link',
  	'Password',
  	'Select',
  	'Rating',
  	'Read Only',
  	'Attach',
  	'Attach Image',
  	'Signature',
  	'Color',
  	'Barcode',
  	'Geolocation',
  	'Duration',
  	'Icon'
  )
  
  no_value_fields = (
  	'Section Break',
  	'Column Break',
  	'HTML',
  	'Table',
  	'Table MultiSelect',
  	'Button',
  	'Image',
  	'Fold',
  	'Heading'
  )
  
  display_fieldtypes = (
  	'Section Break',
  	'Column Break',
  	'HTML',
  	'Button',
  	'Image',
  	'Fold',
  	'Heading')
  
  numeric_fieldtypes = (
  	'Currency',
  	'Int',
  	'Long Int',
  	'Float',
  	'Percent',
  	'Check'
  )
  
  data_field_options = (
  	'Email',
  	'Name',
  	'Phone',
  	'URL',
  	'Barcode'
  )
  
  default_fields = (
  	'doctype',
  	'name',
  	'owner',
  	'creation',
  	'modified',
  	'modified_by',
  	'parent',
  	'parentfield',
  	'parenttype',
  	'idx',
  	'docstatus'
  )
  
  optional_fields = (
  	"_user_tags",
  	"_comments",
  	"_assign",
  	"_liked_by",
  	"_seen"
  )
  
  table_fields = (
  	'Table',
  	'Table MultiSelect'
  )
  
  core_doctypes_list = (
  	'DocType',
  	'DocField',
  	'DocPerm',
  	'DocType Action',
  	'DocType Link',
  	'User',
  	'Role',
  	'Has Role',
  	'Page',
  	'Module Def',
  	'Print Format',
  	'Report',
  	'Customize Form',
  	'Customize Form Field',
  	'Property Setter',
  	'Custom Field',
  	'Client Script'
  )
  
  log_types = (
  	'Version',
  	'Error Log',
  	'Scheduled Job Log',
  	'Event Sync Log',
  	'Event Update Log',
  	'Access Log',
  	'View Log',
  	'Activity Log',
  	'Energy Point Log',
  	'Notification Log',
  	'Email Queue',
  	'DocShare',
  	'Document Follow',
  	'Console Log'
  )
  
  def delete_fields(args_dict, delete=0):
  	"""
  		Delete a field.
  		* Deletes record from `tabDocField`
  		* If not single doctype: Drops column from table
  		* If single, deletes record from `tabSingles`
  		args_dict = { dt: [field names] }
  	"""
  	import frappe.utils
  	for dt in args_dict:
  		fields = args_dict[dt]
  		if not fields:
  			continue
  
  		frappe.db.delete("DocField", {
  			"parent": dt,
  			"fieldname": ("in", fields),
  		})
  
  		# Delete the data/column only if delete is specified
  		if not delete:
  			continue
  
  		if frappe.db.get_value("DocType", dt, "issingle"):
  			frappe.db.delete("Singles", {
  				"doctype": dt,
  				"field": ("in", fields),
  			})
  		else:
  			existing_fields = frappe.db.describe(dt)
  			existing_fields = existing_fields and [e[0] for e in existing_fields] or []
  			fields_need_to_delete = set(fields) & set(existing_fields)
  			if not fields_need_to_delete:
  				continue
  
  			if frappe.db.db_type == 'mariadb':
  				# mariadb implicitly commits before DDL, make it explicit
  				frappe.db.commit()
  
  			query = "ALTER TABLE `tab%s` " % dt + \
  				", ".join("DROP COLUMN `%s`" % f for f in fields_need_to_delete)
  			frappe.db.sql(query)
  
  		if frappe.db.db_type == 'postgres':
  			# commit the results to db
  			frappe.db.commit()
  