/*
    Copyright 2013 appPlant UG

    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.
*/

#import "APPPrinter.h"

#define APP_PRINT_CANCELLED 0  // Printing cancelled (cancel button pressed)
#define APP_PRINT_SENT      2  // Page printed
#define APP_PRINT_FAILED    3  // Printing failed
#define APP_PRINT_NOTSENT   4  // Page not printed (something wrong happened)

@interface APPPrinter (Private)

// Erstellt den PrintController
- (UIPrintInteractionController *) getPrintController;
// Stellt die Eigenschaften des Druckers ein.
- (UIPrintInteractionController *) adjustSettingsForPrintController:(UIPrintInteractionController *)controller;
// Lädt den zu druckenden Content in ein WebView, welcher vom Drucker ausgedruckt werden soll.
- (void) loadContent:(NSString *)content intoPrintController:(UIPrintInteractionController *)controller;
// Ruft den Callback auf und informiert diesen über den das Ergebnis des Druckvorgangs.
- (void) informAboutResult:(int)code callbackId:(NSString *)callbackId;
// Überprüft, ob der Drucker-Dienst verfügbar ist
- (BOOL) isPrintServiceAvailable;

@end


@implementation APPPrinter

/*
 * Is printing available.
 */
- (void) isServiceAvailable:(CDVInvokedUrlCommand *)command
{
    CDVPluginResult* pluginResult;

    pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK
                                    messageAsBool:[self isPrintServiceAvailable]];

    [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
}

/**
 * Öffnet den Drucker-Kontroller zur Auswahl des Druckers.
 * Callback gibt Meta-Informationen an.
 */
- (void) print:(CDVInvokedUrlCommand *)command
{
    if (![self isPrintServiceAvailable])
    {
        [self informAboutResult:APP_PRINT_FAILED callbackId:command.callbackId];
        return;
    }

    NSArray*  arguments  = [command arguments];
    NSString* content    = [arguments objectAtIndex:0];

    UIPrintInteractionController* controller = [self getPrintController];

    [self adjustSettingsForPrintController:controller];
    [self loadContent:content intoPrintController:controller];

    [controller presentAnimated:YES completionHandler:^(UIPrintInteractionController* printController, BOOL completed, NSError* error) {
        if (completed) {
            [self informAboutResult:APP_PRINT_SENT callbackId:command.callbackId];
        } else if (error) {
            [self informAboutResult:APP_PRINT_FAILED callbackId:command.callbackId];
        } else {
            [self informAboutResult:APP_PRINT_CANCELLED callbackId:command.callbackId];
        }
    }];
}

/**
 * Erstellt den PrintController.
 */
- (UIPrintInteractionController *) getPrintController
{
    return [UIPrintInteractionController sharedPrintController];
}

/**
 * Stellt die Eigenschaften des Druckers ein.
 */
- (UIPrintInteractionController *) adjustSettingsForPrintController:(UIPrintInteractionController *)controller
{
    UIPrintInfo* printInfo    = [UIPrintInfo printInfo];
    printInfo.outputType      = UIPrintInfoOutputGeneral;
    controller.printInfo      = printInfo;
    controller.showsPageRange = YES;

    return controller;
}

/**
 * Lädt den zu druckenden Content in ein WebView, welcher vom Drucker ausgedruckt werden soll.
 */
- (void) loadContent:(NSString *)content intoPrintController:(UIPrintInteractionController *)controller
{
    // Set the base URL to be the www directory.
    NSString* wwwFilePath = [[NSBundle mainBundle] pathForResource:@"www" ofType:nil];
    NSURL*    baseURL     = [NSURL fileURLWithPath:wwwFilePath];
    // Load page into a webview and use its formatter to print the page
    UIWebView* webPage    = [[UIWebView alloc] init];

    [webPage loadHTMLString:content baseURL:baseURL];

    // Get formatter for web (note: margin not required - done in web page)
    UIViewPrintFormatter* formatter = [webPage viewPrintFormatter];

    controller.printFormatter = formatter;
    controller.showsPageRange = YES;
}

/**
 * Ruft den Callback auf und informiert diesen über den das Ergebnis des Druckvorgangs.
 */
- (void) informAboutResult:(int)code callbackId:(NSString *)callbackId
{
    CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK
                                                     messageAsInt:code];

    [self.commandDelegate sendPluginResult:pluginResult callbackId:callbackId];
}

/**
 * Überprüft, ob der Drucker-Dienst verfügbar ist.
 */
- (BOOL) isPrintServiceAvailable
{
    Class printController = NSClassFromString(@"UIPrintInteractionController");

    if (printController)
    {
        UIPrintInteractionController* controller = [UIPrintInteractionController sharedPrintController];

        return (controller != nil) && [UIPrintInteractionController isPrintingAvailable];
    }

    return NO;
}

@end