/*
 *  Copyright (C) 2015-2016 Savoir-faire Linux Inc.
 *  Author: Alexandre Lision <alexandre.lision@savoirfairelinux.com>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA.
 */
#import "RingWindowController.h"
#import <QuartzCore/QuartzCore.h>
#include <qrencode.h>

//Qt
#import <QItemSelectionModel>
#import <QItemSelection>

//LRC
#import <accountmodel.h>
#import <callmodel.h>
#import <account.h>
#import <call.h>
#import <recentmodel.h>

// Ring
#import "AppDelegate.h"
#import "Constants.h"
#import "CurrentCallVC.h"
#import "MigrateRingAccountsWC.h"
#import "ConversationVC.h"
#import "PreferencesWC.h"
#import "views/IconButton.h"
#import "views/NSColor+RingTheme.h"

@interface RingWindowController () <MigrateRingAccountsDelegate>

@property (retain) MigrateRingAccountsWC* migrateWC;

@end

@implementation RingWindowController {

    __unsafe_unretained IBOutlet NSLayoutConstraint* centerYQRCodeConstraint;
    __unsafe_unretained IBOutlet NSLayoutConstraint* centerYWelcomeContainerConstraint;
    __unsafe_unretained IBOutlet NSView* welcomeContainer;
    __unsafe_unretained IBOutlet NSView* callView;
    __unsafe_unretained IBOutlet NSTextField* ringIDLabel;
    __unsafe_unretained IBOutlet NSButton* shareButton;
    __unsafe_unretained IBOutlet NSImageView* qrcodeView;

    PreferencesWC* preferencesWC;
    CurrentCallVC* currentCallVC;
    ConversationVC* offlineVC;
}

QMetaObject::Connection accountUpdate;
static NSString* const kPreferencesIdentifier = @"PreferencesIdentifier";

- (void)windowDidLoad {
    [super windowDidLoad];
    [self.window setMovableByWindowBackground:YES];

    currentCallVC = [[CurrentCallVC alloc] initWithNibName:@"CurrentCall" bundle:nil];
    offlineVC = [[ConversationVC alloc] initWithNibName:@"Conversation" bundle:nil];

    [callView setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
    [[currentCallVC view] setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];
    [[offlineVC view] setAutoresizingMask:NSViewWidthSizable | NSViewHeightSizable];

    [callView addSubview:[currentCallVC view] positioned:NSWindowAbove relativeTo:nil];
    [callView addSubview:[offlineVC view] positioned:NSWindowAbove relativeTo:nil];

    [currentCallVC initFrame];
    [offlineVC initFrame];

    [self checkAccountsToMigrate];
}

- (void) connect
{
    // Update Ring ID label based on account model changes
    QObject::disconnect(accountUpdate);
    accountUpdate = QObject::connect(&AccountModel::instance(),
                                     &AccountModel::dataChanged,
                                     [=] {
                                         [self updateRingID];
                                     });

    QObject::connect(RecentModel::instance().selectionModel(),
                     &QItemSelectionModel::currentChanged,
                     [=](const QModelIndex &current, const QModelIndex &previous) {
                         auto call = RecentModel::instance().getActiveCall(current);

                         if(!current.isValid()) {
                             [offlineVC animateOut];
                             [currentCallVC animateOut];
                             return;
                         }

                         if (!call) {
                             [currentCallVC animateOut];
                             [offlineVC animateIn];
                         } else {
                             [currentCallVC animateIn];
                             [offlineVC animateOut];
                         }
                     });

    QObject::connect(CallModel::instance().selectionModel(),
                     &QItemSelectionModel::currentChanged,
                     [=](const QModelIndex &current, const QModelIndex &previous) {
                         if(!current.isValid()) {
                             return;
                         }

                         if (previous.isValid()) {
                             // We were already on a call
                             [currentCallVC animateOut];
                         } else {
                             // Make sure Conversation view hides when selecting a valid call
                             [currentCallVC animateIn];
                             [offlineVC animateOut];
                         }
                     });
}

/**
 * Implement the necessary logic to choose which Ring ID to display.
 * This tries to choose the "best" ID to show
 */
- (void) updateRingID
{
    Account* registered = nullptr;
    Account* enabled = nullptr;
    Account* finalChoice = nullptr;

    [ringIDLabel setStringValue:@""];
    auto ringList = AccountModel::instance().getAccountsByProtocol(Account::Protocol::RING);
    for (int i = 0 ; i < ringList.size() && !registered ; ++i) {
        Account* acc = ringList.value(i);
        if (acc->isEnabled()) {
            if(!enabled)
                enabled = finalChoice = acc;
            if (acc->registrationState() == Account::RegistrationState::READY) {
                registered = enabled = finalChoice = acc;
            }
        } else {
            if (!finalChoice)
                finalChoice = acc;
        }
    }

    [ringIDLabel setStringValue:[[NSString alloc] initWithFormat:@"%@", finalChoice->username().toNSString()]];
}

- (IBAction)shareRingID:(id)sender {
    NSSharingServicePicker* sharingServicePicker = [[NSSharingServicePicker alloc] initWithItems:[NSArray arrayWithObject:[ringIDLabel stringValue]]];
    [sharingServicePicker setDelegate:self];
    [sharingServicePicker showRelativeToRect:[sender bounds]
                                      ofView:sender
                               preferredEdge:NSMinYEdge];
}

- (IBAction)toggleQRCode:(id)sender {
    // Toggle pressed state of QRCode button
    [sender setPressed:![sender isPressed]];
    if (![sender isPressed]) {
        // Recenter welcome view
        [self showQRCode:NO];
        return;
    }

    auto qrCode = QRcode_encodeString(ringIDLabel.stringValue.UTF8String,
                                      0,
                                      QR_ECLEVEL_L, // Lowest level of error correction
                                      QR_MODE_8, // 8-bit data mode
                                      1);
    if (!qrCode) {
        return;
    }

    CGFloat size = qrcodeView.frame.size.width;

    // create context
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef ctx = CGBitmapContextCreate(0, size, size, 8, size * 4, colorSpace, kCGImageAlphaPremultipliedLast);

    CGAffineTransform translateTransform = CGAffineTransformMakeTranslation(0, -size);
    CGAffineTransform scaleTransform = CGAffineTransformMakeScale(1, -1);
    CGContextConcatCTM(ctx, CGAffineTransformConcat(translateTransform, scaleTransform));

    // draw QR on this context
    [self drawQRCode:qrCode context:ctx size:size];

    // get image
    auto qrCGImage = CGBitmapContextCreateImage(ctx);
    auto qrImage = [[NSImage alloc] initWithCGImage:qrCGImage size:qrcodeView.frame.size];

    // some releases
    CGContextRelease(ctx);
    CGImageRelease(qrCGImage);
    CGColorSpaceRelease(colorSpace);
    QRcode_free(qrCode);

    [qrcodeView setImage:qrImage];
    [self showQRCode:YES];
}

/**
 * @param code the previously generated QRCode
 * @param ctx current drawing context
 * @param size the output size in which to draw
 */
- (void)drawQRCode:(QRcode *)code context:(CGContextRef)ctx size:(CGFloat)size {
    unsigned char *data = 0;
    int width;
    data = code->data;
    width = code->width;
    int qr_margin = 3;
    float zoom = ceil((double)size / (code->width + 2.0 * qr_margin));
    CGRect rectDraw = CGRectMake(0, 0, zoom, zoom);

    int ran;
    for(int i = 0; i < width; ++i) {
        for(int j = 0; j < width; ++j) {
            if(*data & 1) {
                CGContextSetFillColorWithColor(ctx, [NSColor ringDarkGrey].CGColor);
                rectDraw.origin = CGPointMake((j + qr_margin) * zoom,(i + qr_margin) * zoom);
                CGContextAddRect(ctx, rectDraw);
                CGContextFillPath(ctx);
            } else {
                CGContextSetFillColorWithColor(ctx, [NSColor windowBackgroundColor].CGColor);
                rectDraw.origin = CGPointMake((j + qr_margin) * zoom,(i + qr_margin) * zoom);
                CGContextAddRect(ctx, rectDraw);
                CGContextFillPath(ctx);
            }
            ++data;
        }
    }
}

/**
 * Start the in/out animation displaying the QRCode
 * @param show should the QRCode be animated in or out
 */
- (void) showQRCode:(BOOL) show
{
    static const NSInteger offset = 110;
    [NSAnimationContext beginGrouping];
    NSAnimationContext.currentContext.duration = 0.5;
    [[NSAnimationContext currentContext] setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionDefault]];
    qrcodeView.animator.alphaValue = show ? 1.0 : 0.0;
    [centerYQRCodeConstraint.animator setConstant: show ? offset : 0];
    [centerYWelcomeContainerConstraint.animator setConstant:show ? -offset : 0];
    [NSAnimationContext endGrouping];
}

- (IBAction)openPreferences:(id)sender
{
    preferencesWC = [[PreferencesWC alloc] initWithWindowNibName:@"PreferencesWindow"];
    [preferencesWC.window makeKeyAndOrderFront:preferencesWC.window];
}

#pragma mark - Ring account migration

- (void) migrateRingAccount:(Account*) acc
{
    self.migrateWC = [[MigrateRingAccountsWC alloc] initWithDelegate:self actionCode:1];
    self.migrateWC.account = acc;
#if MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_9
    [self.window beginSheet:self.migrateWC.window completionHandler:nil];
#else
    [NSApp beginSheet: self.migrateWC.window
       modalForWindow: self.window
        modalDelegate: self
       didEndSelector: nil
          contextInfo: nil];
#endif
}

- (void)checkAccountsToMigrate
{
    auto ringList = AccountModel::instance().accountsToMigrate();
    if (ringList.length() > 0){
        Account* acc = ringList.value(0);
        [self migrateRingAccount:acc];
    } else {
        // Fresh run, we need to make sure RingID appears
        [self updateRingID];
        [shareButton sendActionOn:NSLeftMouseDownMask];

        [self connect];
    }
}

- (void)migrationDidComplete
{
    [self checkAccountsToMigrate];
}

- (void)migrationDidCompleteWithError
{
    [self checkAccountsToMigrate];
}

@end