/******************************************************************************
 * Copyright (c) 2006-2012 Transmission authors and contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *****************************************************************************/

#include <libtransmission/transmission.h>
#include <libtransmission/log.h>

#import "MessageWindowController.h"
#import "Controller.h"
#import "NSApplicationAdditions.h"
#import "NSMutableArrayAdditions.h"
#import "NSStringAdditions.h"

#define LEVEL_ERROR 0
#define LEVEL_INFO  1
#define LEVEL_DEBUG 2

#define UPDATE_SECONDS  0.75

@interface MessageWindowController (Private)

- (void) resizeColumn;
- (BOOL) shouldIncludeMessageForFilter: (NSString *) filterString message: (NSDictionary *) message;
- (void) updateListForFilter;
- (NSString *) stringForMessage: (NSDictionary *) message;

@end

@implementation MessageWindowController

- (id) init
{
    return [super initWithWindowNibName: @"MessageWindow"];
}

- (void) awakeFromNib
{
    NSWindow * window = [self window];
    [window setFrameAutosaveName: @"MessageWindowFrame"];
    [window setFrameUsingName: @"MessageWindowFrame"];
    [window setRestorationClass: [self class]];

    [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(resizeColumn)
        name: NSTableViewColumnDidResizeNotification object: fMessageTable];

    [window setContentBorderThickness: NSMinY([[fMessageTable enclosingScrollView] frame]) forEdge: NSMinYEdge];

    [[self window] setTitle: NSLocalizedString(@"Message Log", "Message window -> title")];

    //set images and text for popup button items
    [[fLevelButton itemAtIndex: LEVEL_ERROR] setTitle: NSLocalizedString(@"Error", "Message window -> level string")];
    [[fLevelButton itemAtIndex: LEVEL_INFO] setTitle: NSLocalizedString(@"Info", "Message window -> level string")];
    [[fLevelButton itemAtIndex: LEVEL_DEBUG] setTitle: NSLocalizedString(@"Debug", "Message window -> level string")];
    if (![NSApp isOnYosemiteOrBetter])
    {
        [[fLevelButton itemAtIndex: LEVEL_ERROR] setImage: [NSImage imageNamed: @"RedDotGlossy"]];
        [[fLevelButton itemAtIndex: LEVEL_INFO] setImage: [NSImage imageNamed: @"YellowDotGlossy"]];
        [[fLevelButton itemAtIndex: LEVEL_DEBUG] setImage: [NSImage imageNamed: @"PurpleDotGlossy"]];
    }

    const CGFloat levelButtonOldWidth = NSWidth([fLevelButton frame]);
    [fLevelButton sizeToFit];

    //set table column text
    [[[fMessageTable tableColumnWithIdentifier: @"Date"] headerCell] setTitle: NSLocalizedString(@"Date",
        "Message window -> table column")];
    [[[fMessageTable tableColumnWithIdentifier: @"Name"] headerCell] setTitle: NSLocalizedString(@"Process",
        "Message window -> table column")];
    [[[fMessageTable tableColumnWithIdentifier: @"Message"] headerCell] setTitle: NSLocalizedString(@"Message",
        "Message window -> table column")];

    //set and size buttons
    [fSaveButton setTitle: [NSLocalizedString(@"Save", "Message window -> save button") stringByAppendingEllipsis]];
    [fSaveButton sizeToFit];

    NSRect saveButtonFrame = [fSaveButton frame];
    saveButtonFrame.size.width += 10.0;
    saveButtonFrame.origin.x += NSWidth([fLevelButton frame]) - levelButtonOldWidth;
    [fSaveButton setFrame: saveButtonFrame];

    const CGFloat oldClearButtonWidth = [fClearButton frame].size.width;

    [fClearButton setTitle: NSLocalizedString(@"Clear", "Message window -> save button")];
    [fClearButton sizeToFit];

    NSRect clearButtonFrame = [fClearButton frame];
    clearButtonFrame.size.width = MAX(clearButtonFrame.size.width + 10.0, saveButtonFrame.size.width);
    clearButtonFrame.origin.x -= NSWidth(clearButtonFrame) - oldClearButtonWidth;
    [fClearButton setFrame: clearButtonFrame];

    [[fFilterField cell] setPlaceholderString: NSLocalizedString(@"Filter", "Message window -> filter field")];
    NSRect filterButtonFrame = [fFilterField frame];
    filterButtonFrame.origin.x -= NSWidth(clearButtonFrame) - oldClearButtonWidth;
    [fFilterField setFrame: filterButtonFrame];

    fAttributes = [[[[fMessageTable tableColumnWithIdentifier: @"Message"] dataCell] attributedStringValue]
                    attributesAtIndex: 0 effectiveRange: NULL];

    //select proper level in popup button
    switch ([[NSUserDefaults standardUserDefaults] integerForKey: @"MessageLevel"])
    {
        case TR_LOG_ERROR:
            [fLevelButton selectItemAtIndex: LEVEL_ERROR];
            break;
        case TR_LOG_INFO:
            [fLevelButton selectItemAtIndex: LEVEL_INFO];
            break;
        case TR_LOG_DEBUG:
            [fLevelButton selectItemAtIndex: LEVEL_DEBUG];
            break;
        default: //safety
            [[NSUserDefaults standardUserDefaults] setInteger: TR_LOG_ERROR forKey: @"MessageLevel"];
            [fLevelButton selectItemAtIndex: LEVEL_ERROR];
    }

    fMessages = [[NSMutableArray alloc] init];
    fDisplayedMessages = [[NSMutableArray alloc] init];

    fLock = [[NSLock alloc] init];
}

- (void) dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver: self];
    [fTimer invalidate];
}

- (void) windowDidBecomeKey: (NSNotification *) notification
{
    if (!fTimer)
    {
        fTimer = [NSTimer scheduledTimerWithTimeInterval: UPDATE_SECONDS target: self selector: @selector(updateLog:) userInfo: nil repeats: YES];
        [self updateLog: nil];
    }
}

- (void) windowWillClose: (id)sender
{
    [fTimer invalidate];
    fTimer = nil;
}

+ (void) restoreWindowWithIdentifier: (NSString *) identifier state: (NSCoder *) state completionHandler: (void (^)(NSWindow *, NSError *)) completionHandler
{
    NSAssert1([identifier isEqualToString: @"MessageWindow"], @"Trying to restore unexpected identifier %@", identifier);

    NSWindow * window = [[(Controller *)[NSApp delegate] messageWindowController] window];
    completionHandler(window, nil);
}

- (void) window: (NSWindow *) window didDecodeRestorableState: (NSCoder *) coder
{
    [fTimer invalidate];
    fTimer = [NSTimer scheduledTimerWithTimeInterval: UPDATE_SECONDS target: self selector: @selector(updateLog:) userInfo: nil repeats: YES];
    [self updateLog: nil];
}

- (void) updateLog: (NSTimer *) timer
{
    tr_log_message * messages;
    if ((messages = tr_logGetQueue()) == NULL)
        return;

    [fLock lock];

    static NSUInteger currentIndex = 0;

    NSScroller * scroller = [[fMessageTable enclosingScrollView] verticalScroller];
    const BOOL shouldScroll = currentIndex == 0 || [scroller floatValue] == 1.0 || [scroller isHidden]
                                || [scroller knobProportion] == 1.0;

    const NSInteger maxLevel = [[NSUserDefaults standardUserDefaults] integerForKey: @"MessageLevel"];
    NSString * filterString = [fFilterField stringValue];

    BOOL changed = NO;

    for (tr_log_message * currentMessage = messages; currentMessage != NULL; currentMessage = currentMessage->next)
    {
        NSString * name = currentMessage->name != NULL ? @(currentMessage->name)
                            : [[NSProcessInfo processInfo] processName];

        NSString * file = [[@(currentMessage->file) lastPathComponent] stringByAppendingFormat: @":%d",
                            currentMessage->line];

        NSDictionary * message  = @{
                                    @"Message": @(currentMessage->message),
                                    @"Date": [NSDate dateWithTimeIntervalSince1970: currentMessage->when],
                                    @"Index": @(currentIndex++), //more accurate when sorting by date
                                    @"Level": @(currentMessage->level),
                                    @"Name": name,
                                    @"File": file};
        [fMessages addObject: message];

        if (currentMessage->level <= maxLevel && [self shouldIncludeMessageForFilter: filterString message: message])
        {
            [fDisplayedMessages addObject: message];
            changed = YES;
        }
    }

    if ([fMessages count] > TR_LOG_MAX_QUEUE_LENGTH)
    {
        const NSUInteger oldCount = [fDisplayedMessages count];

        NSIndexSet * removeIndexes = [NSIndexSet indexSetWithIndexesInRange: NSMakeRange(0, [fMessages count]-TR_LOG_MAX_QUEUE_LENGTH)];
        NSArray * itemsToRemove = [fMessages objectsAtIndexes: removeIndexes];

        [fMessages removeObjectsAtIndexes: removeIndexes];
        [fDisplayedMessages removeObjectsInArray: itemsToRemove];

        changed |= oldCount > [fDisplayedMessages count];
    }

    if (changed)
    {
        [fDisplayedMessages sortUsingDescriptors: [fMessageTable sortDescriptors]];

        [fMessageTable reloadData];
        if (shouldScroll)
            [fMessageTable scrollRowToVisible: [fMessageTable numberOfRows]-1];
    }

    [fLock unlock];

    tr_logFreeQueue (messages);
}

- (NSInteger) numberOfRowsInTableView: (NSTableView *) tableView
{
    return [fDisplayedMessages count];
}

- (id) tableView: (NSTableView *) tableView objectValueForTableColumn: (NSTableColumn *) column row: (NSInteger) row
{
    NSString * ident = [column identifier];
    NSDictionary * message = fDisplayedMessages[row];

    if ([ident isEqualToString: @"Date"])
        return message[@"Date"];
    else if ([ident isEqualToString: @"Level"])
    {
        const NSInteger level = [message[@"Level"] integerValue];
        switch (level)
        {
            case TR_LOG_ERROR:
                return [NSImage imageNamed: ([NSApp isOnYosemiteOrBetter] ? @"RedDotFlat" : @"RedDotGlossy")];
            case TR_LOG_INFO:
                return [NSImage imageNamed: ([NSApp isOnYosemiteOrBetter] ? @"YellowDotFlat" : @"YellowDotGlossy")];
            case TR_LOG_DEBUG:
                return [NSImage imageNamed: ([NSApp isOnYosemiteOrBetter] ? @"PurpleDotFlat" : @"PurpleDotGlossy")];
            default:
                NSAssert1(NO, @"Unknown message log level: %ld", level);
                return nil;
        }
    }
    else if ([ident isEqualToString: @"Name"])
        return message[@"Name"];
    else
        return message[@"Message"];
}

#warning don't cut off end
- (CGFloat) tableView: (NSTableView *) tableView heightOfRow: (NSInteger) row
{
    NSString * message = fDisplayedMessages[row][@"Message"];

    NSTableColumn * column = [tableView tableColumnWithIdentifier: @"Message"];
    const CGFloat count = floorf([message sizeWithAttributes: fAttributes].width / [column width]);

    return [tableView rowHeight] * (count + 1.0);
}

- (void) tableView: (NSTableView *) tableView sortDescriptorsDidChange: (NSArray *) oldDescriptors
{
    [fDisplayedMessages sortUsingDescriptors: [fMessageTable sortDescriptors]];
    [fMessageTable reloadData];
}

- (NSString *) tableView: (NSTableView *) tableView toolTipForCell: (NSCell *) cell rect: (NSRectPointer) rect
                tableColumn: (NSTableColumn *) column row: (NSInteger) row mouseLocation: (NSPoint) mouseLocation
{
    NSDictionary * message = fDisplayedMessages[row];
    return message[@"File"];
}

- (void) copy: (id) sender
{
    NSIndexSet * indexes = [fMessageTable selectedRowIndexes];
    NSMutableArray * messageStrings = [NSMutableArray arrayWithCapacity: [indexes count]];

    for (NSDictionary * message in [fDisplayedMessages objectsAtIndexes: indexes])
        [messageStrings addObject: [self stringForMessage: message]];

    NSString * messageString = [messageStrings componentsJoinedByString: @"\n"];

    NSPasteboard * pb = [NSPasteboard generalPasteboard];
    [pb clearContents];
    [pb writeObjects: @[messageString]];
}

- (BOOL) validateMenuItem: (NSMenuItem *) menuItem
{
    SEL action = [menuItem action];

    if (action == @selector(copy:))
        return [fMessageTable numberOfSelectedRows] > 0;

    return YES;
}

- (void) changeLevel: (id) sender
{
    NSInteger level;
    switch ([fLevelButton indexOfSelectedItem])
    {
        case LEVEL_ERROR:
            level = TR_LOG_ERROR;
            break;
        case LEVEL_INFO:
            level = TR_LOG_INFO;
            break;
        case LEVEL_DEBUG:
            level = TR_LOG_DEBUG;
            break;
        default:
            NSAssert1(NO, @"Unknown message log level: %ld", [fLevelButton indexOfSelectedItem]);
            level = TR_LOG_INFO;
    }

    if ([[NSUserDefaults standardUserDefaults] integerForKey: @"MessageLevel"] == level)
        return;

    [[NSUserDefaults standardUserDefaults] setInteger: level forKey: @"MessageLevel"];

    [fLock lock];

    [self updateListForFilter];

    [fLock unlock];
}

- (void) changeFilter: (id) sender
{
    [fLock lock];

    [self updateListForFilter];

    [fLock unlock];
}

- (void) clearLog: (id) sender
{
    [fLock lock];

    [fMessages removeAllObjects];

    [fMessageTable beginUpdates];
    [fMessageTable removeRowsAtIndexes: [NSIndexSet indexSetWithIndexesInRange: NSMakeRange(0, [fDisplayedMessages count])] withAnimation: NSTableViewAnimationSlideLeft];

    [fDisplayedMessages removeAllObjects];

    [fMessageTable endUpdates];

    [fLock unlock];
}

- (void) writeToFile: (id) sender
{
    NSSavePanel * panel = [NSSavePanel savePanel];
    [panel setAllowedFileTypes: @[@"txt"]];
    [panel setCanSelectHiddenExtension: YES];

    [panel setNameFieldStringValue: NSLocalizedString(@"untitled", "Save log panel -> default file name")];

    [panel beginSheetModalForWindow: [self window] completionHandler: ^(NSInteger result) {
        if (result == NSFileHandlingPanelOKButton)
        {
            //make the array sorted by date
            NSSortDescriptor * descriptor = [NSSortDescriptor sortDescriptorWithKey: @"Index" ascending: YES];
            NSArray * descriptors = [[NSArray alloc] initWithObjects: descriptor, nil];
            NSArray * sortedMessages = [fDisplayedMessages sortedArrayUsingDescriptors: descriptors];

            //create the text to output
            NSMutableArray * messageStrings = [NSMutableArray arrayWithCapacity: [sortedMessages count]];
            for (NSDictionary * message in sortedMessages)
                [messageStrings addObject: [self stringForMessage: message]];

            NSString * fileString = [messageStrings componentsJoinedByString: @"\n"];

            if (![fileString writeToFile: [[panel URL] path] atomically: YES encoding: NSUTF8StringEncoding error: nil])
            {
                NSAlert * alert = [[NSAlert alloc] init];
                [alert addButtonWithTitle: NSLocalizedString(@"OK", "Save log alert panel -> button")];
                [alert setMessageText: NSLocalizedString(@"Log Could Not Be Saved", "Save log alert panel -> title")];
                [alert setInformativeText: [NSString stringWithFormat:
                                            NSLocalizedString(@"There was a problem creating the file \"%@\".",
                                                              "Save log alert panel -> message"), [[[panel URL] path] lastPathComponent]]];
                [alert setAlertStyle: NSWarningAlertStyle];

                [alert runModal];
            }
        }
    }];
}

@end

@implementation MessageWindowController (Private)

- (void) resizeColumn
{
    [fMessageTable noteHeightOfRowsWithIndexesChanged: [NSIndexSet indexSetWithIndexesInRange:
                    NSMakeRange(0, [fMessageTable numberOfRows])]];
}

- (BOOL) shouldIncludeMessageForFilter: (NSString *) filterString message: (NSDictionary *) message
{
    if ([filterString isEqualToString: @""])
        return YES;

    const NSStringCompareOptions searchOptions = NSCaseInsensitiveSearch | NSDiacriticInsensitiveSearch;
    return [message[@"Name"] rangeOfString: filterString options: searchOptions].location != NSNotFound
            || [message[@"Message"] rangeOfString: filterString options: searchOptions].location != NSNotFound;
}

- (void) updateListForFilter
{
    const NSInteger level = [[NSUserDefaults standardUserDefaults] integerForKey: @"MessageLevel"];
    NSString * filterString = [fFilterField stringValue];

    NSIndexSet * indexes = [fMessages indexesOfObjectsWithOptions: NSEnumerationConcurrent passingTest: ^BOOL(id message, NSUInteger idx, BOOL * stop) {
        return [((NSDictionary *)message)[@"Level"] integerValue] <= level && [self shouldIncludeMessageForFilter: filterString message: message];
    }];

    NSArray * tempMessages = [[fMessages objectsAtIndexes: indexes] sortedArrayUsingDescriptors: [fMessageTable sortDescriptors]];

    [fMessageTable beginUpdates];

    //figure out which rows were added/moved
    NSUInteger currentIndex = 0, totalCount = 0;
    NSMutableArray * itemsToAdd = [NSMutableArray array];
    NSMutableIndexSet * itemsToAddIndexes = [NSMutableIndexSet indexSet];

    for (NSDictionary * message in tempMessages)
    {
        const NSUInteger previousIndex = [fDisplayedMessages indexOfObject: message inRange: NSMakeRange(currentIndex, [fDisplayedMessages count]-currentIndex)];
        if (previousIndex == NSNotFound)
        {
            [itemsToAdd addObject: message];
            [itemsToAddIndexes addIndex: totalCount];
        }
        else
        {
            if (previousIndex != currentIndex)
            {
                [fDisplayedMessages moveObjectAtIndex: previousIndex toIndex: currentIndex];
                [fMessageTable moveRowAtIndex: previousIndex toIndex: currentIndex];
            }
            ++currentIndex;
        }

        ++totalCount;
    }

    //remove trailing items - those are the unused
    if (currentIndex < [fDisplayedMessages count])
    {
        const NSRange removeRange = NSMakeRange(currentIndex, [fDisplayedMessages count]-currentIndex);
        [fDisplayedMessages removeObjectsInRange: removeRange];
        [fMessageTable removeRowsAtIndexes: [NSIndexSet indexSetWithIndexesInRange: removeRange] withAnimation: NSTableViewAnimationSlideDown];
    }

    //add new items
    [fDisplayedMessages insertObjects: itemsToAdd atIndexes: itemsToAddIndexes];
    [fMessageTable insertRowsAtIndexes: itemsToAddIndexes withAnimation: NSTableViewAnimationSlideUp];

    [fMessageTable endUpdates];

    NSAssert2([fDisplayedMessages isEqualToArray: tempMessages], @"Inconsistency between message arrays! %@ %@", fDisplayedMessages, tempMessages);
}

- (NSString *) stringForMessage: (NSDictionary *) message
{
    NSString * levelString;
    const NSInteger level = [message[@"Level"] integerValue];
    switch (level)
    {
        case TR_LOG_ERROR:
            levelString = NSLocalizedString(@"Error", "Message window -> level");
            break;
        case TR_LOG_INFO:
            levelString = NSLocalizedString(@"Info", "Message window -> level");
            break;
        case TR_LOG_DEBUG:
            levelString = NSLocalizedString(@"Debug", "Message window -> level");
            break;
        default:
            NSAssert1(NO, @"Unknown message log level: %ld", level);
            levelString = @"?";
    }

    return [NSString stringWithFormat: @"%@ %@ [%@] %@: %@", message[@"Date"],
            message[@"File"], levelString,
            message[@"Name"], message[@"Message"], nil];
}

@end
