/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.ofbiz.order;

import java.math.BigDecimal;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.ofbiz.base.util.Debug;
import org.apache.ofbiz.base.util.GeneralException;
import org.apache.ofbiz.base.util.ObjectType;
import org.apache.ofbiz.base.util.UtilDateTime;
import org.apache.ofbiz.base.util.UtilHttp;
import org.apache.ofbiz.base.util.UtilMisc;
import org.apache.ofbiz.base.util.UtilProperties;
import org.apache.ofbiz.base.util.UtilValidate;
import org.apache.ofbiz.entity.Delegator;
import org.apache.ofbiz.entity.GenericEntityException;
import org.apache.ofbiz.entity.GenericValue;
import org.apache.ofbiz.entity.condition.EntityCondition;
import org.apache.ofbiz.entity.condition.EntityConditionList;
import org.apache.ofbiz.entity.condition.EntityExpr;
import org.apache.ofbiz.entity.condition.EntityOperator;
import org.apache.ofbiz.entity.util.EntityQuery;
import org.apache.ofbiz.order.order.OrderChangeHelper;
import org.apache.ofbiz.service.GenericServiceException;
import org.apache.ofbiz.service.LocalDispatcher;
import org.apache.ofbiz.service.ModelService;

/**
 * Order Manager Events
 */
public class OrderManagerEvents {

    public static final String module = OrderManagerEvents.class.getName();
    public static final String resource_error = "OrderErrorUiLabels";

    // FIXME: this event doesn't seem to be used; we may want to remove it
    public static String processOfflinePayments(HttpServletRequest request, HttpServletResponse response) {
        HttpSession session = request.getSession();
        LocalDispatcher dispatcher = (LocalDispatcher) request.getAttribute("dispatcher");
        Delegator delegator = (Delegator) request.getAttribute("delegator");
        GenericValue userLogin = (GenericValue) session.getAttribute("userLogin");
        Locale locale = UtilHttp.getLocale(request);

        if (session.getAttribute("OFFLINE_PAYMENTS") != null) {
            String orderId = (String) request.getAttribute("orderId");
            List<GenericValue> toBeStored = new LinkedList<GenericValue>();
            List<GenericValue> paymentPrefs = null;
            GenericValue placingCustomer = null;
            try {
                paymentPrefs = EntityQuery.use(delegator).from("OrderPaymentPreference").where("orderId", orderId).queryList();
                placingCustomer = EntityQuery.use(delegator).from("OrderRole").where("orderId", orderId, "roleTypeId", "PLACING_CUSTOMER").queryFirst();
            } catch (GenericEntityException e) {
                Debug.logError(e, "Problems looking up order payment preferences", module);
                request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderErrorProcessingOfflinePayments", locale));
                return "error";
            }
            if (paymentPrefs != null) {
                for (GenericValue ppref : paymentPrefs) {
                    // update the preference to received
                    // TODO: updating payment preferences should be done as a service
                    ppref.set("statusId", "PAYMENT_RECEIVED");
                    ppref.set("authDate", UtilDateTime.nowTimestamp());
                    toBeStored.add(ppref);

                    // create a payment record
                    Map<String, Object> results = null;
                    try {
                        results = dispatcher.runSync("createPaymentFromPreference", UtilMisc.toMap("orderPaymentPreferenceId", ppref.get("orderPaymentPreferenceId"),
                                "paymentFromId", placingCustomer.getString("partyId"), "comments", "Payment received offline and manually entered."));
                    } catch (GenericServiceException e) {
                        Debug.logError(e, "Failed to execute service createPaymentFromPreference", module);
                        request.setAttribute("_ERROR_MESSAGE_", e.getMessage());
                        return "error";
                    }

                    if ((results == null) || (results.get(ModelService.RESPONSE_MESSAGE).equals(ModelService.RESPOND_ERROR))) {
                        Debug.logError((String) results.get(ModelService.ERROR_MESSAGE), module);
                        request.setAttribute("_ERROR_MESSAGE_", results.get(ModelService.ERROR_MESSAGE));
                        return "error";
                    }
                }

                // store the updated preferences
                try {
                    delegator.storeAll(toBeStored);
                } catch (GenericEntityException e) {
                    Debug.logError(e, "Problems storing payment information", module);
                    request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderProblemStoringReceivedPaymentInformation", locale));
                    return "error";
                }

                // set the status of the order to approved
                OrderChangeHelper.approveOrder(dispatcher, userLogin, orderId);
            }
        }
        return "success";
    }

    public static String receiveOfflinePayment(HttpServletRequest request, HttpServletResponse response) {
        HttpSession session = request.getSession();
        LocalDispatcher dispatcher = (LocalDispatcher) request.getAttribute("dispatcher");
        Delegator delegator = (Delegator) request.getAttribute("delegator");
        GenericValue userLogin = (GenericValue) session.getAttribute("userLogin");
        Locale locale = UtilHttp.getLocale(request);

        String orderId = request.getParameter("orderId");
        String partyId = request.getParameter("partyId");

        // get the order header & payment preferences
        GenericValue orderHeader = null;
        try {
            orderHeader = EntityQuery.use(delegator).from("OrderHeader").where("orderId", orderId).queryOne();
        } catch (GenericEntityException e) {
            Debug.logError(e, "Problems reading order header from datasource.", module);
            request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderProblemsReadingOrderHeaderInformation", locale));
            return "error";
        }

        BigDecimal grandTotal = BigDecimal.ZERO;
        if (orderHeader != null) {
            grandTotal = orderHeader.getBigDecimal("grandTotal");
        }

        // get the payment types to receive
        List<GenericValue> paymentMethodTypes = null;

        try {
            paymentMethodTypes = EntityQuery.use(delegator).from("PaymentMethodType").where(EntityCondition.makeCondition("paymentMethodTypeId", EntityOperator.NOT_EQUAL, "EXT_OFFLINE")).queryList();
        } catch (GenericEntityException e) {
            Debug.logError(e, "Problems getting payment types", module);
            request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderProblemsWithPaymentTypeLookup", locale));
            return "error";
        }

        if (paymentMethodTypes == null) {
            request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderProblemsWithPaymentTypeLookup", locale));
            return "error";
        }

        // get the payment methods to receive
        List<GenericValue> paymentMethods = null;
        try {
            paymentMethods = EntityQuery.use(delegator).from("PaymentMethod").where("partyId", partyId).queryList();
        } catch (GenericEntityException e) {
            Debug.logError(e, "Problems getting payment methods", module);
            request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderProblemsWithPaymentMethodLookup", locale));
            return "error";
        }

        GenericValue placingCustomer = null;
        try {
            placingCustomer = EntityQuery.use(delegator).from("OrderRole").where("orderId", orderId, "roleTypeId", "PLACING_CUSTOMER").queryFirst();
        } catch (GenericEntityException e) {
            Debug.logError(e, "Problems looking up order payment preferences", module);
            request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderErrorProcessingOfflinePayments", locale));
            return "error";
        }

        for (GenericValue paymentMethod : paymentMethods) {
            String paymentMethodId = paymentMethod.getString("paymentMethodId");
            String paymentMethodAmountStr = request.getParameter(paymentMethodId + "_amount");
            String paymentMethodReference = request.getParameter(paymentMethodId + "_reference");
            if (!UtilValidate.isEmpty(paymentMethodAmountStr)) {
                BigDecimal paymentMethodAmount = BigDecimal.ZERO;
                try {
                    paymentMethodAmount = (BigDecimal) ObjectType.simpleTypeConvert(paymentMethodAmountStr, "BigDecimal", null, locale);
                } catch (GeneralException e) {
                    request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderProblemsPaymentParsingAmount", locale));
                    return "error";
                }
                if (paymentMethodAmount.compareTo(BigDecimal.ZERO) > 0) {
                    // create a payment, payment reference and payment appl record, when not exist yet.
                    Map<String, Object> results = null;
                    try {
                        results = dispatcher.runSync("createPaymentFromOrder", 
                            UtilMisc.toMap("orderId", orderId,
                                    "paymentMethodId", paymentMethodId,
                                    "paymentRefNum", paymentMethodReference, 
                                    "comments", "Payment received offline and manually entered.",
                                    "userLogin", userLogin));
                    } catch (GenericServiceException e) {
                        Debug.logError(e, "Failed to execute service createPaymentFromOrder", module);
                        request.setAttribute("_ERROR_MESSAGE_", e.getMessage());
                        return "error";
                    }

                    if ((results == null) || (results.get(ModelService.RESPONSE_MESSAGE).equals(ModelService.RESPOND_ERROR))) {
                        Debug.logError((String) results.get(ModelService.ERROR_MESSAGE), module);
                        request.setAttribute("_ERROR_MESSAGE_", results.get(ModelService.ERROR_MESSAGE));
                        return "error";
                    }
                }
                OrderChangeHelper.approveOrder(dispatcher, userLogin, orderId);
                return "success";
            }
        }

        List<GenericValue> toBeStored = new LinkedList<GenericValue>();
        for (GenericValue paymentMethodType : paymentMethodTypes) {
            String paymentMethodTypeId = paymentMethodType.getString("paymentMethodTypeId");
            String amountStr = request.getParameter(paymentMethodTypeId + "_amount");
            String paymentReference = request.getParameter(paymentMethodTypeId + "_reference");
            if (!UtilValidate.isEmpty(amountStr)) {
                BigDecimal paymentTypeAmount = BigDecimal.ZERO;
                try {
                    paymentTypeAmount = (BigDecimal) ObjectType.simpleTypeConvert(amountStr, "BigDecimal", null, locale);
                } catch (GeneralException e) {
                    request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderProblemsPaymentParsingAmount", locale));
                    return "error";
                }
                if (paymentTypeAmount.compareTo(BigDecimal.ZERO) > 0) {
                    // create the OrderPaymentPreference
                    // TODO: this should be done with a service
                    Map<String, String> prefFields = UtilMisc.<String, String> toMap("orderPaymentPreferenceId", delegator.getNextSeqId("OrderPaymentPreference"));
                    GenericValue paymentPreference = delegator.makeValue("OrderPaymentPreference", prefFields);
                    paymentPreference.set("paymentMethodTypeId", paymentMethodType.getString("paymentMethodTypeId"));
                    paymentPreference.set("maxAmount", paymentTypeAmount);
                    paymentPreference.set("statusId", "PAYMENT_RECEIVED");
                    paymentPreference.set("orderId", orderId);
                    paymentPreference.set("createdDate", UtilDateTime.nowTimestamp());
                    if (userLogin != null) {
                        paymentPreference.set("createdByUserLogin", userLogin.getString("userLoginId"));
                    }

                    try {
                        delegator.create(paymentPreference);
                    } catch (GenericEntityException ex) {
                        Debug.logError(ex, "Cannot create a new OrderPaymentPreference", module);
                        request.setAttribute("_ERROR_MESSAGE_", ex.getMessage());
                        return "error";
                    }

                    // create a payment record
                    Map<String, Object> results = null;
                    try {
                        results = dispatcher.runSync("createPaymentFromPreference", UtilMisc.toMap("userLogin", userLogin,
                                "orderPaymentPreferenceId", paymentPreference.get("orderPaymentPreferenceId"), "paymentRefNum", paymentReference,
                                "paymentFromId", placingCustomer.getString("partyId"), "comments", "Payment received offline and manually entered."));
                    } catch (GenericServiceException e) {
                        Debug.logError(e, "Failed to execute service createPaymentFromPreference", module);
                        request.setAttribute("_ERROR_MESSAGE_", e.getMessage());
                        return "error";
                    }

                    if ((results == null) || (results.get(ModelService.RESPONSE_MESSAGE).equals(ModelService.RESPOND_ERROR))) {
                        Debug.logError((String) results.get(ModelService.ERROR_MESSAGE), module);
                        request.setAttribute("_ERROR_MESSAGE_", results.get(ModelService.ERROR_MESSAGE));
                        return "error";
                    }
                }
            }
        }

        // get the current payment prefs
        GenericValue offlineValue = null;
        List<GenericValue> currentPrefs = null;
        BigDecimal paymentTally = BigDecimal.ZERO;
        try {
            EntityConditionList<EntityExpr> ecl = EntityCondition.makeCondition(UtilMisc.toList(
                    EntityCondition.makeCondition("orderId", EntityOperator.EQUALS, orderId),
                    EntityCondition.makeCondition("statusId", EntityOperator.NOT_EQUAL, "PAYMENT_CANCELLED")),
                    EntityOperator.AND);
            currentPrefs = EntityQuery.use(delegator).from("OrderPaymentPreference").where(ecl).queryList();
        } catch (GenericEntityException e) {
            Debug.logError(e, "ERROR: Unable to get existing payment preferences from order", module);
        }
        if (UtilValidate.isNotEmpty(currentPrefs)) {
            for (GenericValue cp : currentPrefs) {
                String paymentMethodType = cp.getString("paymentMethodTypeId");
                if ("EXT_OFFLINE".equals(paymentMethodType)) {
                    offlineValue = cp;
                } else {
                    BigDecimal cpAmt = cp.getBigDecimal("maxAmount");
                    if (cpAmt != null) {
                        paymentTally = paymentTally.add(cpAmt);
                    }
                }
            }
        }

        // now finish up
        boolean okayToApprove = false;
        if (paymentTally.compareTo(grandTotal) >= 0) {
            // cancel the offline preference
            okayToApprove = true;
            if (offlineValue != null) {
                offlineValue.set("statusId", "PAYMENT_CANCELLED");
                toBeStored.add(offlineValue);
            }
        }

        // store the status changes and the newly created payment preferences and payments
        // TODO: updating order payment preference should be done with a service
        try {
            delegator.storeAll(toBeStored);
        } catch (GenericEntityException e) {
            Debug.logError(e, "Problems storing payment information", module);
            request.setAttribute("_ERROR_MESSAGE_", UtilProperties.getMessage(resource_error, "OrderProblemStoringReceivedPaymentInformation", locale));
            return "error";
        }

        if (okayToApprove) {
            // update the status of the order and items
            OrderChangeHelper.approveOrder(dispatcher, userLogin, orderId);
        }

        return "success";
    }

}