# Copyright (c) 2013, Web Notes Technologies Pvt. Ltd. and Contributors
# MIT License. See license.txt 

from __future__ import unicode_literals
import frappe
from frappe import _, msgprint
from frappe.utils import cint, flt, cstr, now
from frappe.model.naming import set_new_name

class BaseDocument(object):
	def __init__(self, d):
		self.update(d)

	def __getattr__(self, key):
		try:
			return super(BaseDocument, self).__getattr__(key)
		except AttributeError:
			if not key.startswith("__") and key not in ("doctype", "_meta", "meta") and key in self.meta.get_valid_columns():
				return None
			else:
				raise

	@property
	def meta(self):
		if not hasattr(self, "_meta"):
			self._meta = frappe.get_meta(self.doctype)
		
		return self._meta

	def update(self, d):
		if "doctype" in d:
			self.set("doctype", d.get("doctype"))
		for key, value in d.iteritems():
			self.set(key, value)
		
	def get(self, key=None, filters=None, limit=None, default=None):
		if key:
			if filters:
				if isinstance(filters, dict):
					value = _filter(self.__dict__.get(key), filters, limit=limit)
				else:
					default = filters
					filters = None
					value = self.__dict__.get(key, default)
			else:
				value = self.__dict__.get(key, default)
			
			if value is None and key!="_meta" and key in (d.fieldname for d in self.meta.get_table_fields()):
				self.set(key, [])
				value = self.__dict__.get(key)
				
			return value
		else:
			return self.__dict__
				
	def set(self, key, value):
		if isinstance(value, list):
			tmp = []
			for v in value:
				tmp.append(self._init_child(v, key))
			value = tmp

		self.__dict__[key] = value
			
	def append(self, key, value=None):
		if value==None:
			value={}
		if isinstance(value, dict):
			if not self.get(key):
				self.__dict__[key] = []
			value = self._init_child(value, key)
			self.get(key).append(value)
			return value
		else:
			raise ValueError
			
	def extend(self, key, value):
		if isinstance(value, list):
			for v in value:
				self.append(key, v)
		else:
			raise ValueError
	
	def _init_child(self, value, key):
		if not self.doctype:
			return value
		if not isinstance(value, BaseDocument):
			if not "doctype" in value:
				value["doctype"] = self.get_table_field_doctype(key)
				if not value["doctype"]:
					raise AttributeError, key
			value = BaseDocument(value)
			
		value.parent = self.name
		value.parenttype = self.doctype
		value.parentfield = key
		if not value.idx:
			value.idx = len(self.get(key) or []) + 1

		return value

	def get_valid_dict(self):
		d = {}
		for fieldname in self.meta.get_valid_columns():
			d[fieldname] = self.get(fieldname)
		return d
		
	def is_new(self):
		return self.get("__islocal")
									
	def as_dict(self):
		doc = self.get_valid_dict()
		doc["doctype"] = self.doctype
		for df in self.meta.get_table_fields():
			doc[df.fieldname] = [d.as_dict() for d in (self.get(df.fieldname) or [])]
		return doc
					
	def get_table_field_doctype(self, fieldname):
		return self.meta.get_field(fieldname).options
		
	def get_parentfield_of_doctype(self, doctype):
		fieldname = [df.fieldname for df in self.meta.get_table_fields() if df.options==doctype]
		return fieldname[0] if fieldname else None
	
	def db_insert(self):
		set_new_name(self)
		d = self.get_valid_dict()
		columns = d.keys()
		frappe.db.sql("""insert into `tab{doctype}` 
			({columns}) values ({values})""".format(
				doctype = self.doctype,
				columns = ", ".join(["`"+c+"`" for c in columns]),
				values = ", ".join(["%s"] * len(columns))
			), d.values())
		self.set("__islocal", False)

	def db_update(self):
		if self.get("__islocal") or not self.name:
			self.db_insert()
			return
			
		d = self.get_valid_dict()
		columns = d.keys()
		frappe.db.sql("""update `tab{doctype}` 
			set {values} where name=%s""".format(
				doctype = self.doctype,
				values = ", ".join(["`"+c+"`=%s" for c in columns])
			), d.values() + [d.get("name")])
			
	def _fix_numeric_types(self):
		for df in self.meta.get("fields"):
			if df.fieldtype in ("Int", "Check"):
				self.set(df.fieldname, cint(self.get(df.fieldname)))
			elif df.fieldtype in ("Float", "Currency"):
				self.set(df.fieldname, flt(self.get(df.fieldname)))
		
		if self.docstatus is not None:	
			self.docstatus = cint(self.docstatus)
			
	def set_missing_values(self, d):
		for key, value in d.get_valid_dict().iteritems():
			if self.get(key) is None:
				self.set(key, value)
				
	def _get_missing_mandatory_fields(self):
		"""Get mandatory fields that do not have any values"""
		def get_msg(df):
			if df.fieldtype == "Table":
				return "{}: {}: {}".format(_("Error"), _("Data missing in table"), _(df.label))
	
			elif self.parentfield:
				return "{}: {} #{}: {}: {}".format(_("Error"), _("Row"), self.idx,
					_("Value missing for"), _(df.label))

			else:
				return "{}: {}: {}".format(_("Error"), _("Value missing for"), _(df.label))
				
		missing = []
		
		for df in self.meta.get("fields", {"reqd": 1}):
			if self.get(df.fieldname) in (None, []):
				missing.append((df.fieldname, get_msg(df)))
		
		return missing
		
	def get_invalid_links(self):
		def get_msg(df, docname):
			if self.parentfield:
				return "{} #{}: {}: {}".format(_("Row"), self.idx, _(df.label), docname)
			else:
				return "{}: {}".format(_(df.label), docname)
		
		invalid_links = []
		for df in self.meta.get_link_fields():
			doctype = df.options
			
			if not doctype:
				frappe.throw("Options not set for link field: {}".format(df.fieldname))
			
			elif doctype.lower().startswith("link:"):
				doctype = doctype[5:]
				
			docname = self.get(df.fieldname)
			if docname and not frappe.db.get_value(doctype, docname):
				invalid_links.append((df.fieldname, docname, get_msg(df, docname)))
		
		return invalid_links
		
	def _validate_constants(self):
		if frappe.flags.in_import:
			return

		constants = [d.fieldname for d in self.meta.get("fields", {"set_only_once": 1})]
		if constants:
			values = frappe.db.get_value(self.doctype, self.name, constants, as_dict=True)

		for fieldname in constants:
			if self.get(fieldname) != values.get(fieldname):
				frappe.throw("{0}: {1}".format(_("Value cannot be changed for"), 
					_(self.meta.get_label(fieldname))), 
					frappe.CannotChangeConstantError)

def _filter(data, filters, limit=None):
	"""pass filters as:
		{"key": "val", "key": ["!=", "val"],
		"key": ["in", "val"], "key": ["not in", "val"], "key": "^val",
		"key" : True (exists), "key": False (does not exist) }"""

	out = []
	
	for d in data:
		add = True
		for f in filters:
			fval = filters[f]
			
			if fval is True:
				fval = ("not None", fval)
			elif fval is False:
				fval = ("None", fval)
			elif not isinstance(fval, (tuple, list)):
				if isinstance(fval, basestring) and fval.startswith("^"):
					fval = ("^", fval[1:])
				else:
					fval = ("=", fval)
			
			if not frappe.compare(d.get(f), fval[0], fval[1]):
				add = False
				break

		if add:
			out.append(d)
			if limit and (len(out)-1)==limit:
				break
	
	return out