var config       = require('./../tcrud-config');
var debug        = require('debug')('ff:tcrud:mongoose');
var clone        = require('clone');
var validate     = require('validate.io');

// ------- MongoosePlugin Object

function MongoosePlugin(key,conn) {
	this.key = key;
	this.conn = conn;
}

MongoosePlugin.prototype.configPlugin = function (ctx) {
	ctx.key='mongoose#'+this.key;
	ctx.description='Adds ldap backend support.';
};

MongoosePlugin.prototype.createBackend = function() {
	return new MongooseBackend(this);
}

//------- MongooseBackend Object

function MongooseBackend(plugin) {
	this.plugin = plugin;
}

MongooseBackend.prototype.getKey = function() {
	return this.plugin.key;
}

MongooseBackend.prototype.findAll = function(tview,crudType) {
	var self = this;
	return function(data, dataParam, cb) {
		debug('find all..'+tview.tmeta.tmodel.tid);
		var model = self.plugin.conn.model(tview.tmeta.tmodel.tid);
		model.find({},function (err, result) {
			if (err) {
				debug(err);
				cb(err);
			} else {
				cb(err,result.rows);
			}
		});
//		cb();
//		var querySql = 'SELECT '+selectField(tview,crudType)+' FROM '+tview.tmeta.tmodel.tid+'';
//		debug('findAll %s',querySql);
//		var query = self.db.query(querySql,[],
	};
}

MongooseBackend.prototype.createNew = function(tview,crudType) {
	var self = this;
	return function(data, dataParam, cb) {
		
	};
}

MongooseBackend.prototype.findOne = function(tview,crudType) {
	var self = this;
	return function(data, dataParam, cb) {
		debug('findOne param %s',JSON.stringify(dataParam));
		//debug('findOne sql %s',querySql);
		var model = self.plugin.conn.model(tview.tmeta.tmodel.tid);
		model.findById(dataParam,function (err, result) {
			if (err) {
				debug(err);
				cb(err);
			} else {
				cb(err,result.rows);
			}
		});
		
//		var querySql = 'SELECT '+selectField(tview,crudType)+' FROM '+tview.tmeta.tmodel.tid+' WHERE '+whereKeys(tview)+'';
//		
	};
}

MongooseBackend.prototype.updateOne = function(tview,crudType) {
	var self = this;
	return function(data, dataParam, cb) {
		debug('updateOne param %s',JSON.stringify(dataParam));
		debug('updateOne data %s',JSON.stringify(data));
		var model = self.plugin.conn.model(tview.tmeta.tmodel.tid);
		model.save(data,function (err, result) {
			if (err) {
				debug(err);
				cb(err);
			} else {
				cb(err,result.rows);
			}
		});
		
//		var querySql = 'UPDATE '+tview.tmeta.tmodel.tid+' '+updateValues(tview,data)+' WHERE '+whereKeys(tview);
//		
//		debug('updateOne sql %s',querySql);
//		var query = self.db.query(querySql, data, function (err, result) {
//			if (err) {
//				debug(err);
//				cb(err);
//			} else {
//				cb(err,result.rows[0]);
//			}
//		});
	};
}

MongooseBackend.prototype.deleteOne = function(tview,crudType) {
	var self = this;
	return function(data, dataParam, cb) {
//		var querySql = 'DELETE FROM '+tview.tmeta.tmodel.tid+' WHERE '+whereKeys(tview);
//		debug('deleteOne param %s',JSON.stringify(dataParam));
//		debug('deleteOne sql %s',querySql);
//		var query = self.db.query(querySql, dataParam, function (err, result) {
//			if (err) {
//				debug(err);
//				cb(err);
//			} else {
//				cb(err,result.rows[0]);
//			}
//		});
	};
}

MongooseBackend.prototype.findAllCount = function(tview,crudType) {
	var self = this;
	return function(data, dataParam, cb) {
//		var querySql = 'SELECT count(*) FROM '+tview.tmeta.tmodel.tid+' WHERE '+whereKeys(tview);
//		debug('findAllCount param %s',JSON.stringify(dataParam));
//		debug('findAllCount sql %s',querySql);
//		var query = self.db.query(querySql, dataParam, function (err, result) {
//			if (err) {
//				debug(err);
//				cb(err);
//			} else {
//				cb(err,result.rows[0]);
//			}
//		});
	};
}






function autoFieldType(fieldMeta,fieldType) {
	if (!fieldMeta) {
		throw new Error('no fieldMeta');
	}
	if (fieldType && fieldType.length != 0) {
		return fieldType;
	}
	if (fieldMeta.type == Date) {
		return 'date';
	}
	return 'text';
}

buildFields = function(modelMeta) {
	if (!modelMeta) {
		throw new Error('no modelMeta');
	}
	var tfields = {};
	var keys = Object.keys(modelMeta);
	for (i = 0; i < keys.length; i++) {
		var key = keys[i];
		var value = modelMeta[key];
		var tfield = null;
		if (key && value && value.tfield) {
			debug('tfield model cloned');
			tfield        = clone(value.tfield);
			tfield.tid    = key;
			tfield.tname  = tfield.tname;
			tfield.type   = autoFieldType(value,tfield.ttype);
		} else if (key && value) {
			debug('tfield model auto created');
			tfield        = config.createTField(key);
			tfield.type   = autoFieldType(value);
		}
		if (tfield.tvalidate && tfield.tvalidate.io) {
			debug('tfield validate rule: '+tfield.tvalidate.io);
		}
		tfields[tfield.tid] = tfield;
	}
	return tfields;
}

function ss(valueRule) {
	return function (value, response) {
		response(validate(valueRule,value));
	};
}

createModelValidators = function (modelSchema,modelFields) {
	if (!modelSchema) {
		throw new Error('no modelSchema');
	}
	if (!modelFields) {
		throw new Error('no modelFields');
	}
	var keys = Object.keys(modelFields);
	for (var i = 0; i < keys.length; i++) {
		var key = keys[i];
		var tfield = modelFields[key];
		if (!tfield.tvalidate) {
			continue;
		}
		if (!tfield.tvalidate.io) {
			continue;
		}
		modelSchema.path(tfield.tid).validate(ss(tfield.tvalidate.io), '{PATH} validation failed: '+tfield.tvalidate.io);
	}
}

buildStatics = function(modelFields,modelStatics) {
	if (!modelFields) {
		throw new Error('no modelFields');
	}
	if (!modelStatics) {
		modelStatics = {};
	}
	modelStatics['ff_tcrud_fields'] = modelFields;
	return modelStatics;
}

buildTEntityModel = function(mongoose,tcrudParent,name) {
	var model = mongoose.model(name);
	var tcrud = config.createTEntity(tcrudParent,name, '_id');
	var tfields = model['ff_tcrud_fields'];
	if (tfields) {
		tcrud.tmeta.tfields = tfields;
	}
	tcrud.tmodel = name;
	
	return tcrud;
}

buildTEntityModels = function(conn,tcrudParent) {
	var result = [];
	var modelNames = conn.modelNames();
	for (var i = 0; i < modelNames.length; i++) {
		result.push(buildTEntityModel(conn,tcrudParent,modelNames[i]))
	}
	return result;
}


// ----- wrappers

buildStaticsModel = function(modelMeta,modelStatics) {
	return buildStatics(buildFields(modelMeta),modelStatics);
}

buildStaticsModelValidated = function(modelMeta,modelSchema,modelStatics) {
	var modelFields = buildFields(modelMeta);
	createModelValidators(modelSchema,modelFields);
	return buildStatics(modelFields,modelStatics);
}



module.exports = {
	buildTEntityModels: buildTEntityModels,
	buildStaticsModelValidated: buildStaticsModelValidated,
	buildFields: buildFields,
	registrate: function(key,conn) {
		config.registratePlugin(new MongoosePlugin(key,conn));
	}
}