//
//  RMTimeImageSet.m
//
// Copyright (c) 2008-2009, Route-Me Contributors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
//   list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
//   this list of conditions and the following disclaimer in the documentation
//   and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

#import "RMGlobalConstants.h"
#import "RMTileLoader.h"

#import "RMTileImage.h"
#import "RMTileSource.h"
#import "RMPixel.h"
#import "RMMercatorToScreenProjection.h"
#import "RMFractalTileProjection.h"
#import "RMTileImageSet.h"

#import "RMTileCache.h"

@implementation RMTileLoader

@synthesize loadedBounds, loadedZoom;

- (id)init
{
	if (![self initWithContent:nil])
		return nil;

	return self;
}

- (id)initWithContent:(RMMapContents *)_contents
{
	if (!(self = [super init]))
		return nil;

	content = _contents;

	[self clearLoadedBounds];
	loadedTiles.origin.tile = RMTileDummy();

	suppressLoading = NO;

	return self;
}

- (void)clearLoadedBounds
{
	loadedBounds = CGRectZero;
}

- (BOOL)screenIsLoaded
{
	//	RMTileRect targetRect = [content tileBounds];
	BOOL contained = CGRectContainsRect(loadedBounds, [content screenBounds]);

	NSUInteger targetZoom = (NSUInteger)([[content mercatorToTileProjection] calculateNormalisedZoomFromScale:[content scaledMetersPerPixel]]);
	if ((targetZoom > content.maxZoom) || (targetZoom < content.minZoom))
    {
          RMLog(@"target zoom %d is outside of RMMapContents limits %f to %f", targetZoom, content.minZoom, content.maxZoom);
    }
    
	if (contained == NO)
	{
        // RMLog(@"reassembling because its not contained");
	}
	
	if (targetZoom != loadedZoom)
	{
		// RMLog(@"reassembling because target zoom = %f, loaded zoom = %d", targetZoom, loadedZoom);
	}

	return contained && targetZoom == loadedZoom;
}

- (void)updateLoadedImages
{
	if (suppressLoading)
		return;

	if ([content mercatorToTileProjection] == nil || [content mercatorToScreenProjection] == nil)
		return;

	if ([self screenIsLoaded])
		return;

	RMTileRect newTileRect = [content tileBounds];

	RMTileImageSet *images = [content imagesOnScreen];
	images.zoom = newTileRect.origin.tile.zoom;
    
	CGRect newLoadedBounds = [images loadTiles:newTileRect toDisplayIn:[content screenBounds]];
	
	if (!RMTileIsDummy(loadedTiles.origin.tile))
	{
		[images removeTilesOutsideOf:newTileRect];
	}

	loadedBounds = newLoadedBounds;
	loadedZoom = newTileRect.origin.tile.zoom;
	loadedTiles = newTileRect;

	[content tilesUpdatedRegion:newLoadedBounds];
} 

- (void)moveBy:(CGSize)delta
{
	loadedBounds = RMTranslateCGRectBy(loadedBounds, delta);
	[self updateLoadedImages];
}

- (void)zoomByFactor:(float)zoomFactor near:(CGPoint)center
{
	loadedBounds = RMScaleCGRectAboutPoint(loadedBounds, zoomFactor, center);
	[self updateLoadedImages];
}

- (BOOL)suppressLoading
{
	return suppressLoading;
}

- (void)setSuppressLoading:(BOOL)suppress
{
	suppressLoading = suppress;
	
	if (suppress == NO)
		[self updateLoadedImages];
}

- (void)reset
{
	loadedTiles.origin.tile = RMTileDummy();
}

- (void)reload
{
	[self clearLoadedBounds];
	[self updateLoadedImages];
}

@end