// -*- Mode: ObjC; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*-
//
// This file is part of the LibreOffice project.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#import "config.h"

#import <algorithm>

// This is not "external" code in the UNO-based extensions sense. To be able to include
// <comphelper/lok.hxx>, we must #define LIBO_INTERNAL_ONLY.

#define LIBO_INTERNAL_ONLY
#include <sal/config.h>
#include <sal/log.hxx>
#include <rtl/ustring.hxx>
#include <comphelper/lok.hxx>
#include <i18nlangtag/languagetag.hxx>

#import "ios.h"
#import "AppDelegate.h"
#import "Document.h"
#import "DocumentViewController.h"

#import "ClientSession.hpp"
#import "DocumentBroker.hpp"
#import "FakeSocket.hpp"
#import "Kit.hpp"
#import "KitHelper.hpp"
#import "Log.hpp"
#import "LOOLWSD.hpp"
#import "Protocol.hpp"

@implementation Document

- (id)contentsForType:(NSString*)typeName error:(NSError **)errorPtr {
    // Somehow this doesn't feel right, creating an NSFileWrapper around the file that was given to
    // us for loadFromContents. I get the vague feeling that the file is perhaps just a temporary
    // data container created by the system for us to be used while loading the document data, and
    // not the actual permanent document, especially in the case of things like NextCloud. Or is it?
    // Is savng back to it (which we have already done by the time we get here, in the LO core code)
    // correct? This does seem to work, though. Anyway, clearly I need to read more documentation
    // for UIDocument etc.
    return [[NSFileWrapper alloc] initWithURL:[self fileURL] options:0 error:errorPtr];
}

- (BOOL)loadFromContents:(id)contents ofType:(NSString *)typeName error:(NSError **)errorPtr {

    fakeClientFd = fakeSocketSocket();
    NSString *uri = [[self fileURL] absoluteString];

    comphelper::LibreOfficeKit::setLanguageTag(LanguageTag(OUString::fromUtf8(OString([app_locale UTF8String])), true));

    NSURL *url = [[NSBundle mainBundle] URLForResource:@"loleaflet" withExtension:@"html"];
    NSURLComponents *components = [NSURLComponents componentsWithURL:url resolvingAgainstBaseURL:NO];
    components.queryItems = @[ [NSURLQueryItem queryItemWithName:@"file_path" value:uri],
                               [NSURLQueryItem queryItemWithName:@"closebutton" value:@"1"],
                               [NSURLQueryItem queryItemWithName:@"permission" value:@"edit"],
                               [NSURLQueryItem queryItemWithName:@"lang" value:app_locale]
                             ];

    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:components.URL];
    [self.viewController.webView loadRequest:request];

    return YES;
}

- (void)send2JS:(const char *)buffer length:(int)length {
    LOG_TRC("To JS: " << LOOLProtocol::getAbbreviatedMessage(buffer, length).c_str());

    NSString *js;

    // Check if the message is binary. We say that any message that isn't just a single line is
    // "binary" even if that strictly speaking isn't the case; for instance the commandvalues:
    // message has a long bunch of non-binary JSON on multiple lines. But _onMessage() in Socket.js
    // handles it fine even if such a message, too, comes in as an ArrayBuffer. (Look for the
    // "textMsg = String.fromCharCode.apply(null, imgBytes);".)

    const char *newline = (const char *)memchr(buffer, '\n', length);
    if (newline != nullptr) {
        // The data needs to be an ArrayBuffer
        js = @"window.TheFakeWebSocket.onmessage({'data': Base64ToArrayBuffer('";
        js = [js stringByAppendingString: [[NSData dataWithBytes:buffer length:length] base64EncodedStringWithOptions:0]];
        js = [js stringByAppendingString:@"')});"];
        NSString *subjs = [js substringToIndex:std::min(100ul, js.length)];
        if (subjs.length < js.length)
            subjs = [subjs stringByAppendingString:@"..."];

        // LOG_TRC("Evaluating JavaScript: " << [subjs UTF8String]);

        dispatch_async(dispatch_get_main_queue(), ^{
                [self.viewController.webView evaluateJavaScript:js
                                              completionHandler:^(id _Nullable obj, NSError * _Nullable error)
                     {
                         if (error) {
                             LOG_ERR("Error after " << [subjs UTF8String] << ": " << [error.localizedDescription UTF8String]);
                         }
                     }
                 ];
        });
    } else {
        const unsigned char *ubufp = (const unsigned char *)buffer;
        std::vector<char> data;
        for (int i = 0; i < length; i++) {
            if (ubufp[i] < ' ' || ubufp[i] == '\'' || ubufp[i] == '\\') {
                data.push_back('\\');
                data.push_back('x');
                data.push_back("0123456789abcdef"[(ubufp[i] >> 4) & 0x0F]);
                data.push_back("0123456789abcdef"[ubufp[i] & 0x0F]);
            } else {
                data.push_back(ubufp[i]);
            }
        }
        data.push_back(0);

        js = @"window.TheFakeWebSocket.onmessage({'data': '";
        js = [js stringByAppendingString:[NSString stringWithUTF8String:data.data()]];
        js = [js stringByAppendingString:@"'});"];

        // LOG_TRC("Evaluating JavaScript: " << [js UTF8String]);

        dispatch_async(dispatch_get_main_queue(), ^{
                [self.viewController.webView evaluateJavaScript:js
                                              completionHandler:^(id _Nullable obj, NSError * _Nullable error)
                     {
                         if (error) {
                             LOG_ERR("Error after " << [js UTF8String] << ": " << [[error localizedDescription] UTF8String]);
                             NSString *jsException = error.userInfo[@"WKJavaScriptExceptionMessage"];
                             if (jsException != nil)
                                 LOG_ERR("JavaScript exception: " << [jsException UTF8String]);
                         }
                     }
                 ];
            });
    }
}

@end

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