//
//  MPOutlineViewController.m
//  MacPass
//
//  Created by michael starke on 19.02.13.
//  Copyright (c) 2013 HicknHack Software GmbH. All rights reserved.
//
//  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, see <http://www.gnu.org/licenses/>.
//

#import "MPOutlineViewController.h"
#import "MPActionHelper.h"
#import "MPConstants.h"
#import "MPContextMenuHelper.h"
#import "MPDocument.h"
#import "MPDocumentWindowController.h"
#import "MPIconHelper.h"
#import "MPNotifications.h"
#import "MPOutlineContextMenuDelegate.h"
#import "MPOutlineDataSource.h"
#import "MPOutlineTableCellView.h"

#import "KeePassKit/KeePassKit.h"
#import "KPKNode+IconImage.h"

#import "HNHUi/HNHUi.h"

#define EXPIRED_GROUP_REFRESH_SECONDS 60

NSString *const MPOutlineViewDidChangeGroupSelection = @"com.macpass.MPOutlineViewDidChangeGroupSelection";

NSString *const _MPOutlineViewDataViewIdentifier = @"DataCell";
NSString *const _MPOutlinveViewHeaderViewIdentifier = @"HeaderCell";

@interface MPOutlineViewController () {
  BOOL _bindingEstablished;
  MPOutlineContextMenuDelegate *_menuDelegate;
  
}
@property (weak) IBOutlet NSOutlineView *outlineView;

@property (strong) NSTreeController *treeController;
@property (strong) MPOutlineDataSource *datasource;

@property (copy, nonatomic) NSString *databaseNameWrapper;

@end

@implementation MPOutlineViewController

- (NSString *)nibName {
  return @"OutlineView";
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
  if (self) {
    _treeController = [[NSTreeController alloc] init];
    _bindingEstablished = NO;
    _datasource = [[MPOutlineDataSource alloc] init];
    _databaseNameWrapper = NSLocalizedString(@"NEW_DATABASE", "Name for a newly created Database");
    _menuDelegate = [[MPOutlineContextMenuDelegate alloc] init];
    _menuDelegate.viewController = self;
  }
  
  return self;
}

- (void)dealloc {
  [self.outlineView unbind:NSContentBinding];
  [self.treeController unbind:NSContentBinding];
  [NSNotificationCenter.defaultCenter removeObserver:self];
  [self.outlineView setDelegate:nil];
}

- (void)viewDidLoad {
  self.outlineView.menu = [self _contextMenu];
  self.outlineView.allowsEmptySelection = YES;
  self.outlineView.floatsGroupRows = NO;
  self.outlineView.doubleAction = @selector(_doubleClickedGroup:);
  self.outlineView.allowsMultipleSelection = YES;
  self.outlineView.delegate = self;
  [self.outlineView registerForDraggedTypes:@[ KPKGroupUTI, KPKEntryUTI ]];
  [self.outlineView setDraggingSourceOperationMask:NSDragOperationEvery forLocal:YES];
  
  [NSNotificationCenter.defaultCenter addObserver:self
                                         selector:@selector(_didBecomeFirstResponder:)
                                             name:MPDidActivateViewNotification
                                           object:self.outlineView];
  
  
  NSView *clipView = self.outlineView.enclosingScrollView.contentView;
  [NSNotificationCenter.defaultCenter addObserver:self
                                         selector:@selector(_outlineDidScroll:)
                                             name:NSViewBoundsDidChangeNotification
                                           object:clipView];
  
}

- (NSResponder *)reconmendedFirstResponder {
  return self.outlineView;
}

#pragma mark Outline handling

- (void)showOutline {
  if(!_bindingEstablished) {
    MPDocument *document = self.windowController.document;
    self.treeController.childrenKeyPath = NSStringFromSelector(@selector(groups));
    [self.treeController bind:NSContentBinding toObject:document withKeyPath:NSStringFromSelector(@selector(tree)) options:nil];
    [self.outlineView bind:NSContentBinding toObject:self.treeController withKeyPath:NSStringFromSelector(@selector(arrangedObjects)) options:nil];
    [self.outlineView bind:NSSelectionIndexPathsBinding toObject:self.treeController withKeyPath:NSStringFromSelector(@selector(selectionIndexPaths)) options:nil];
    [self bind:NSStringFromSelector(@selector(databaseNameWrapper)) toObject:document.tree.metaData withKeyPath:NSStringFromSelector(@selector(databaseName)) options:nil];
    self.outlineView.dataSource = self.datasource;
    _bindingEstablished = YES;
  }
  NSTreeNode *node = [_outlineView itemAtRow:0];
  NSInteger topRow = 0;
  [self _expandItems:node topRow:&topRow];
  if(topRow > 0) {
    NSRect rowRect = [self.outlineView rectOfRow:topRow];
    [self.outlineView scrollPoint:rowRect.origin];
  }
}

- (void)_expandItems:(NSTreeNode *)node topRow:(NSInteger *)topRow {
  NSAssert(NULL != topRow, @"Invalid paramter!");
  id nodeItem = node.representedObject;
  if([nodeItem isKindOfClass:[KPKTree class]]) {
    [self.outlineView expandItem:node expandChildren:NO];
    *topRow = -1;
  }
  else if([nodeItem respondsToSelector:@selector(isExpanded)]) {
    if([nodeItem isExpanded]) {
      [self.outlineView expandItem:node];
    }
    else {
      [self.outlineView collapseItem:node];
    }
  }
  for(NSTreeNode *child in node.childNodes) {
    [self _expandItems:child topRow:topRow];
  }
  if([nodeItem respondsToSelector:@selector(uuid)]) {
    MPDocument *document = self.windowController.document;
    NSUUID *uuid = [nodeItem uuid];
    if(*topRow != 1 && [document.tree.metaData.lastTopVisibleGroup isEqual:uuid]) {
      *topRow = [self.outlineView rowForItem:node];
    }
    if([uuid isEqual:document.tree.metaData.lastSelectedGroup]) {
      NSInteger selectedRow = [self.outlineView rowForItem:node];
      if(selectedRow >= 0) {
        [self.outlineView selectRowIndexes:[NSIndexSet indexSetWithIndex:selectedRow] byExtendingSelection:NO];
      }
    }
  }
}

#pragma mark Custom Setter/Getter
- (void)setDatabaseNameWrapper:(NSString *)databaseNameWrapper {
  if(![_databaseNameWrapper isEqualToString:databaseNameWrapper]) {
    _databaseNameWrapper = (databaseNameWrapper.length == 0) ? NSLocalizedString(@"DATABASE", "Default display name for KDB databases") : [databaseNameWrapper copy];
  }
}

#pragma mark MPTargetNodeResolving
- (NSArray<KPKGroup *> *)currentTargetGroups {
  /* there are instances where we get the KPKTree tree as selection, so filter this out! */
  if([self.treeController.selectedObjects.firstObject isKindOfClass:[KPKTree class]] ) {
    return @[];
  }
  return self.treeController.selectedObjects;
}

- (NSArray<KPKNode *> *)currentTargetNodes {
  NSArray *groups = [self currentTargetGroups];
  if(groups.count > 0) {
    return groups;
  }
  MPDocument *document = self.windowController.document;
  return document.selectedNodes;
}

#pragma mark Notifications
- (void)registerNotificationsForDocument:(MPDocument *)document {
  [NSNotificationCenter.defaultCenter addObserver:self selector:@selector(_didAddGroup:) name:MPDocumentDidAddGroupNotification object:document];
}

- (void)clearSelection {
  [self.outlineView deselectAll:nil];
  NSNotification *notification = [NSNotification notificationWithName:NSOutlineViewSelectionDidChangeNotification object:self.outlineView];
  [self outlineViewSelectionDidChange:notification];
}

- (void)_didBecomeFirstResponder:(NSNotification *)notification {
  if( notification.object != self.outlineView ) {
    return; // Nothing we need to worry about
  }
  MPDocument *document = self.windowController.document;
  document.selectedGroups = [self currentTargetGroups];
}

- (void)_outlineDidScroll:(NSNotification *)notification {
  NSView *clipView = notification.object;
  if(nil == clipView || self.outlineView.enclosingScrollView.contentView != clipView) {
    return; // Wrong view
  }
  /* padding to compensate for clipped items */
  CGPoint point = CGPointMake(clipView.bounds.origin.x, clipView.bounds.origin.y + 11);
  NSInteger topRow = [self.outlineView rowAtPoint:point];
  id item = [[self.outlineView itemAtRow:topRow] representedObject];
  if([item isKindOfClass:[KPKGroup class]]) {
    KPKGroup *group = item;
    MPDocument *document = self.windowController.document;
    document.tree.metaData.lastTopVisibleGroup = group.uuid;
  }
}

# pragma mark MPDocument Notifications
- (void)_didAddGroup:(NSNotification *)notification {
  NSDictionary *userInfo = [notification userInfo];
  KPKGroup *group = userInfo[MPDocumentGroupKey];
  NSIndexPath *groupIndexPath = [group indexPath];
  NSTreeNode *groupNode = [[self.treeController arrangedObjects] descendantNodeAtIndexPath:groupIndexPath];
  [self.outlineView expandItem:groupNode.parentNode];
  NSInteger groupRow = [self.outlineView rowForItem:groupNode];
  [self.outlineView selectRowIndexes:[NSIndexSet indexSetWithIndex:groupRow] byExtendingSelection:NO];
  [self.outlineView scrollRowToVisible:groupRow];
}

- (id)itemUnderMouse {
  NSPoint mouseLocation = [self.outlineView.window mouseLocationOutsideOfEventStream];
  NSPoint localPoint = [self.outlineView convertPoint:mouseLocation fromView:self.outlineView.window.contentView];
  NSInteger row = [self.outlineView rowAtPoint:localPoint];
  if(row == -1) {
    return nil; // No row was hit
  }
  return [[self.outlineView itemAtRow:row] representedObject];
}

#pragma mark -
#pragma mark Actions

- (void)_doubleClickedGroup:(id)sender {
  [(MPDocumentWindowController *)self.windowController showInspector:sender];
}

#pragma mark NSOutlineViewDelegate
- (NSView *)outlineView:(NSOutlineView *)outlineView viewForTableColumn:(NSTableColumn *)tableColumn item:(id)item {
  MPOutlineTableCellView *view;
  if( [self _itemIsRootNode:item] ) {
    view = [outlineView makeViewWithIdentifier:_MPOutlinveViewHeaderViewIdentifier owner:self];
    [view.textField bind:NSValueBinding toObject:self  withKeyPath:NSStringFromSelector(@selector(databaseNameWrapper)) options:nil];
  }
  else {
    view = [outlineView makeViewWithIdentifier:_MPOutlineViewDataViewIdentifier owner:self];
    
    NSString *iconImageKeyPath = [NSString stringWithFormat:@"%@.%@", NSStringFromSelector(@selector(representedObject)), NSStringFromSelector(@selector(iconImage))];
    NSString *titleKeyPath = [NSString stringWithFormat:@"%@.%@", NSStringFromSelector(@selector(representedObject)), NSStringFromSelector(@selector(title))];
    [view.imageView bind:NSValueBinding toObject:item withKeyPath:iconImageKeyPath options:nil];
    [view.textField bind:NSValueBinding toObject:item withKeyPath:titleKeyPath options:nil];
    
    
    NSString *entriesCountKeyPath = [[NSString alloc] initWithFormat:@"%@.%@.%@", NSStringFromSelector(@selector(representedObject)), KPKEntriesArrayBinding, @"@count"];
    [view bind:NSStringFromSelector(@selector(count)) toObject:item withKeyPath:entriesCountKeyPath options:nil];
  }
  
  return view;
}

- (BOOL)outlineView:(NSOutlineView *)outlineView isGroupItem:(id)item {
  return [self _itemIsRootNode:item];
}

- (BOOL)outlineView:(NSOutlineView *)outlineView shouldSelectItem:(id)item {
  return ![self _itemIsRootNode:item];
}

- (void)outlineViewSelectionDidChange:(NSNotification *)notification {
  MPDocument *document = self.windowController.document;
  NSArray<KPKGroup *> *groups = [self currentTargetGroups];
  document.tree.metaData.lastSelectedGroup = (groups.count == 1 ? groups.firstObject.uuid : [NSUUID kpk_nullUUID]);
  document.selectedGroups = groups;
}

- (BOOL)outlineView:(NSOutlineView *)outlineView shouldShowOutlineCellForItem:(id)item {
  return ![self _itemIsRootNode:item];
}

- (void)outlineViewItemDidExpand:(NSNotification *)notification {
  NSDictionary *userInfo = [notification userInfo];
  id item = userInfo[NSStringFromClass([NSObject class])];
  id representedObject = [item representedObject];
  if([representedObject isKindOfClass:[KPKGroup class]]) {
    KPKGroup *group = (KPKGroup *)representedObject;
    group.isExpanded = YES;
  }
}
- (void)outlineViewItemDidCollapse:(NSNotification *)notification {
  NSDictionary *userInfo = notification.userInfo;
  id item = userInfo[NSStringFromClass([NSObject class])];
  id representedObject = [item representedObject];
  if([representedObject isKindOfClass:[KPKGroup class]]) {
    KPKGroup *group = (KPKGroup *)representedObject;
    group.isExpanded = NO;
  }
}

- (void)outlineView:(NSOutlineView *)outlineView didRemoveRowView:(NSTableRowView *)rowView forRow:(NSInteger)row {
  /* Deletion of an item */
  if(row == -1) {
    NSNotification *notification = [NSNotification notificationWithName:NSOutlineViewSelectionDidChangeNotification object:outlineView];
    [self outlineViewSelectionDidChange:notification];
  }
}

#pragma mark Validation
- (BOOL)validateMenuItem:(NSMenuItem *)menuItem {
  MPDocument *document = self.windowController.document;
  if(![document validateUserInterfaceItem:menuItem]) {
    return NO;
  }
  KPKGroup *group = [self currentTargetNodes].firstObject.asGroup;
  return group.isTrash && group.isTrashed;
}

- (NSMenu *)_contextMenu {
  NSMenu *menu = [[NSMenu alloc] init];
  menu.delegate = _menuDelegate;
  return menu;
}

- (BOOL)_itemIsRootNode:(id)item {
  id node = [item representedObject];
  return [node isKindOfClass:[KPKTree class]];
}

@end