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#import "HorizontalMeteringView.h"

#include <math.h>

extern double dbamp(double db);

extern ampdb(double amp);

#define kMinBarGap          3

#define kBarHeight          11

#define kBarInteriorHeight  9

#define kClipBoxWidth       6

@implementation HorizontalMeteringView

- (id)initWithFrame:(NSRect)frame {

    self = [super initWithFrame:frame];

    return self;

}

- (void)drawRect:(NSRect)rect {

#pragma unused(rect)

    // Drawing code here.

    NSRect bounds = [self bounds];

    float yOffset = firstTrackOffset + .5;

    float xOffset = 0;

    float topGap  = mHasClip ? kClipBoxWidth + 2: 0;

    int i;

    // draw the frame

    for (i = 0; i < mNumChannels; i++) {

        NSRect  barRect = NSMakeRect(.5, yOffset + .5, bounds.size.width-1.5 - topGap, kBarHeight-2);

        if (!drawsMetersOnly) {

            NSPoint pt1 = NSMakePoint(xOffset, yOffset);

            NSPoint pt2 = NSMakePoint(xOffset, yOffset + kBarHeight - 1);

            NSPoint pt3 = NSMakePoint(xOffset + bounds.size.width-.5 - topGap, pt2.y);

            NSPoint pt4 = NSMakePoint(pt3.x, yOffset);

            [[NSColor colorWithCalibratedWhite: .37 alpha: 1] set]; // light color

            [NSBezierPath strokeLineFromPoint: pt1 toPoint: pt2];

            [NSBezierPath strokeLineFromPoint: pt2 toPoint: pt3];

            [[NSColor colorWithCalibratedWhite: .53 alpha: 1] set]; // shadow color

            [NSBezierPath strokeLineFromPoint: pt3 toPoint: pt4];

            [NSBezierPath strokeLineFromPoint: pt4 toPoint: pt1];

            if (mHasClip) {

                NSPoint pt5 = NSMakePoint(xOffset + bounds.size.width + 2.5 - topGap, yOffset);

                NSPoint pt6 = NSMakePoint(pt5.x, yOffset + kBarHeight - 1);

                NSPoint pt7 = NSMakePoint(xOffset + bounds.size.width - .5, pt6.y);

                NSPoint pt8 = NSMakePoint(pt7.x, pt5.y); // done

                [NSBezierPath strokeLineFromPoint: pt7 toPoint: pt8];

                [NSBezierPath strokeLineFromPoint: pt8 toPoint: pt5];

                [[NSColor colorWithCalibratedWhite: .37 alpha: 1] set]; // light color

                [NSBezierPath strokeLineFromPoint: pt5 toPoint: pt6];

                [NSBezierPath strokeLineFromPoint: pt6 toPoint: pt7];

            }

            // now draw the background to the right of and including the current value

            [[NSColor colorWithCalibratedWhite: .4 alpha: 1] set];

            float value = roundf(mMeterValues[i * 2]);

            barRect.origin.x = value + 1;

            barRect.size.width   = bounds.size.width-2 - value - topGap;

            [NSBezierPath fillRect: barRect];

            if (mHasClip) {

                NSRect clipRect = NSMakeRect(bounds.size.width + 3 - topGap, barRect.origin.y, kClipBoxWidth -1.5, barRect.size.height);

                int clipVal = mClipValues[i];

                if (clipVal == 0) 

                    [[NSColor colorWithCalibratedWhite: .4 alpha: 1] set];

                else if (clipVal >= 1 && clipVal < 10) {

                    [[NSColor redColor] set];

                    clipVal++;

                } else 

                    [[NSColor colorWithCalibratedRed: 0.75 green: .18 blue: .18 alpha: 1] set];

                [NSBezierPath fillRect: clipRect];

            }

            [[NSColor greenColor] set];

            barRect.size.width   = barRect.origin.x;

            barRect.origin.x = 1;

            [NSBezierPath fillRect: barRect]; 

        } else {

            // only draw the difference area

            float old = roundf(mOldMeterValues[i * 2]);

            float curr= roundf(mMeterValues[i * 2]);

            // erase previous peak if it is different from the current

            float oldPeak = roundf(mOldMeterValues[(i*2) + 1]) + .5;

            float newPeak = roundf(mMeterValues[(i*2) + 1]) + .5;

            if (oldPeak != newPeak) {

                [[NSColor colorWithCalibratedWhite: .4 alpha: 1] set];

                [NSBezierPath strokeLineFromPoint: NSMakePoint(oldPeak, barRect.origin.y) 

                                toPoint: NSMakePoint(oldPeak, barRect.origin.y+barRect.size.height)];

            }

            if (curr > old) {   // draw only green difference

                [[NSColor greenColor] set];

                barRect.origin.x = (old < 1)? 1 : old;

                barRect.size.width = curr - old;

                [NSBezierPath fillRect: barRect];           

            } else if (curr < old) {    // draw only gray difference

                [[NSColor colorWithCalibratedWhite: .4 alpha: 1] set];

                barRect.origin.x = curr + 1;

                barRect.size.width = old - curr;

                [NSBezierPath fillRect: barRect]; 

            } 

            // draw the peak

            if (oldPeak != newPeak || mClipValues[i] == 1) {

                if (mClipValues[i] == 1)

                    [[NSColor redColor] set];

                else

                    [[NSColor colorWithCalibratedWhite: .8 alpha: 1] set];

                [NSBezierPath strokeLineFromPoint: NSMakePoint(newPeak, barRect.origin.y) 

                                toPoint: NSMakePoint(newPeak, barRect.origin.y+barRect.size.height)];

            }

            if (mHasClip) {

                NSRect clipRect = NSMakeRect(bounds.size.width + 3 - topGap, barRect.origin.y, 

                                                kClipBoxWidth - 1.5, barRect.size.height  );

                int clipVal = mClipValues[i];

                if (clipVal == 1) {

                    [[NSColor redColor] set];

                    [NSBezierPath fillRect: clipRect];

                    clipVal++;

                } 

                else if (clipVal > 1 && clipVal < 10)

                    clipVal++;

                else if (clipVal == 10) {

                    [[NSColor colorWithCalibratedRed: 0.75 green: .18 blue: .18 alpha: 1] set];

                    [NSBezierPath fillRect: clipRect];

                    clipVal++;

                }

                mClipValues[i] = clipVal;

            }

        }

        yOffset += kMinBarGap + kBarHeight;

    }

    drawsMetersOnly = NO;

}

- (void) setNumChannels: (int) num {

    if (mNumChannels != num) {

        mNumChannels = num;

        if (mMeterValues != nil)

            free(mMeterValues);

        if (mOldMeterValues != nil)

            free(mOldMeterValues);

        if (mClipValues != nil)

            free(mClipValues);

        mMeterValues = (float *) calloc (2 * num, sizeof(float));

        mOldMeterValues = (float *) calloc (2 * num, sizeof(float));

        mClipValues = (int *) calloc (num, sizeof(int));

        drawsMetersOnly = NO;

        firstTrackOffset = floorf(([self bounds].size.height - (num * kBarHeight + (num-1) * kMinBarGap))/2);

        [self setNeedsDisplay: YES];

    }

}

- (void) updateMeters: (float *) meterValues {

    int i;

    if (![self inLiveResize]) {

        int numItems = mNumChannels * 2;

        for (i = 0; i < numItems; i++) {

            float tempValue = dbamp(meterValues[i]); 

            mOldMeterValues[i] = mMeterValues[i];

            float pixelValue = [self pixelForValue: tempValue inSize: (int) [self bounds].size.width];

            float top = [self bounds].size.width - (mHasClip ? kClipBoxWidth + 4: 2);

            if (pixelValue < 0)

                pixelValue = 0;

            else if (pixelValue > top)

                pixelValue = top;

            mMeterValues[i] = pixelValue;

            if (mHasClip) {

                if (tempValue > mMaxValue)

                    mClipValues[i] = 1;

            }       

        }

        drawsMetersOnly = YES;

        [self setNeedsDisplay: YES];

    }

}

- (void)mouseDown:(NSEvent *)theEvent

{

    if (mHasClip) {

        int i;

        float yOffset = .5 + firstTrackOffset;

        float topGap  = mHasClip ? kClipBoxWidth + 3: 0;

        NSRect clipRect = NSMakeRect([self bounds].size.width - topGap, 0, kClipBoxWidth + 3, kBarHeight-2);

        NSPoint mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];

        for (i = 0; i < mNumChannels; i++) {

            clipRect.origin.y = yOffset + .5;

            if ([self mouse:mouseLoc inRect: clipRect]) {

                mClipValues[i] = 0;

                break;

            }

            yOffset += kMinBarGap + kBarHeight;

        }

    }

    drawsMetersOnly = NO;

    [self setNeedsDisplay: YES];

}

- (BOOL) acceptsFirstMouse: (NSEvent *) event {

#pragma unused(event)

    return YES;

}

- (BOOL) isOpaque {

    return YES;

}

@end