/*
    font_info

    Copyright 2010 Aparajita Fishman
*/

#import <Foundation/Foundation.h>
#import <AppKit/AppKit.h>

#define resultFormat @"{\"familyName\":\"%@\", \"bold\":%@, \"italic\":%@, \"ascender\":%g, \"descender\":%g, \"lineHeight\":%g, \"width\":%g}"

enum {
    kErrInvalidArguments = 1,
    kErrInvalidFontName
};


int main(int argc, const char* argv[])
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    int exitCode = 0;
    NSString* stringToMeasure = nil;

    // usage: fontinfo [-n] face [size [string]]

    if (argc >= 2)
    {
        BOOL appendLineFeed = YES;
        int nextArgument = 1;

        if (argv[1][0] == '-')
        {
            if (argv[1][1] == 'n')
            {
                appendLineFeed = NO;
                ++nextArgument;
            }
            else
                exitCode = kErrInvalidArguments;
        }

        if (exitCode == 0)
        {
            CGFloat fontSize = 12;

            NSString* fontName = [NSString stringWithUTF8String:argv[nextArgument++]];

            if (argc > nextArgument)
                fontSize = atof(argv[nextArgument++]);

            if (fontSize > 0.0)
            {
                NSFont* font = [NSFont fontWithName:fontName size:fontSize];

                if (font)
                {
                    if (argc > nextArgument)
                        stringToMeasure = [NSString stringWithUTF8String:argv[nextArgument]];

                    NSString* familyName = [font familyName];
                    NSFontDescriptor* descriptor = [font fontDescriptor];
                    NSFontSymbolicTraits traits = [descriptor symbolicTraits];
                    BOOL isBold = traits & NSFontBoldTrait;
                    BOOL isItalic = traits & NSFontItalicTrait;
                    CGFloat ascender = [font ascender];
                    CGFloat descender = [font descender];

                    NSLayoutManager* layout = [NSLayoutManager new];
                    CGFloat lineHeight = [layout defaultLineHeightForFont:font];
                    [layout release];

                    CGFloat width = 0.0;

                    if (stringToMeasure)
                    {
                        NSDictionary* attributes = [NSDictionary dictionaryWithObject:font forKey:NSFontAttributeName];
                        NSAttributedString* attrString = [[NSAttributedString alloc] initWithString:stringToMeasure attributes:attributes];

                        if (attrString)
                            width = [attrString size].width;

                        [attrString release];
                    }

                    NSMutableString* result = [NSMutableString stringWithFormat:resultFormat,
                                                familyName,
                                                isBold ? @"true" : @"false", isItalic ? @"true" : @"false",
                                                ascender, descender, lineHeight,
                                                width];

                    if (appendLineFeed)
                        [result appendString:@"\n"];

                    printf("%s", [result UTF8String]);
                }
                else
                {
                    exitCode = kErrInvalidFontName;
                }
            }
            else
            {
                exitCode = kErrInvalidArguments;
            }
        }
    }
    else
    {
        exitCode = kErrInvalidArguments;
    }

    [pool drain];
    return exitCode;
}