/**

 * $Id$

 *

 * Miscellaneous utility functions.

 *

 * Copyright (c) 2005 Nathan Keynes.

 *

 * 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 2 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.

 */

#define HAVE_EXECINFO_H 1

#include <assert.h>

#include <ctype.h>

#include <stdarg.h>

#include <stdio.h>

#include <stdlib.h>

#include <signal.h>

#include <time.h>

#include <zlib.h>

#include <glib.h>

#include <png.h>

#include "dream.h"

#include "display.h"

#include "dreamcast.h"

#include "gui.h"

#include "sh4/sh4.h"

char *msg_levels[] = { "FATAL", "ERROR", "WARN", "INFO", "DEBUG", "TRACE" };

int global_msg_level = EMIT_WARN;

static void report_crash( int signo, siginfo_t *info, void *ptr )

{

    char buf[128];

    fprintf( stderr, "--- Aborting with signal %d ---\n", signo );

    sh4_crashdump();

    // Get gdb to print a nice backtrace for us

    snprintf( buf, 128, "gdb -batch -f --quiet --pid=%d -ex bt", getpid() );

    system(buf);

    abort();

}

void install_crash_handler(void)

{

    struct sigaction sa;

    sa.sa_sigaction = report_crash;

    sigemptyset(&sa.sa_mask);

    sa.sa_flags = SA_RESETHAND|SA_SIGINFO;

    sigaction( SIGSEGV, &sa, NULL );

    sigaction( SIGILL, &sa, NULL );

    sigaction( SIGBUS, &sa, NULL );

}

void fwrite_string( const char *s, FILE *f )

{

    uint32_t len = 0;

    if( s == NULL ) {

        fwrite( &len, sizeof(len), 1, f );

    } else {

        len = strlen(s)+1;

        fwrite( &len, sizeof(len), 1, f );

        fwrite( s, len, 1, f );

    }

}

int fread_string( char *s, int maxlen, FILE *f ) 

{

    uint32_t len;

    fread( &len, sizeof(len), 1, f );

    if( len != 0 ) {

        fread( s, len > maxlen ? maxlen : len, 1, f );

    }

    return len;

}

int fwrite_gzip( void *p, size_t sz, size_t count, FILE *f )

{

    uLongf size = sz*count;

    uLongf csize = ((int)(size*1.001))+13;

    unsigned char *tmp = g_malloc0( csize );

    int status = compress( tmp, &csize, p, size );

    assert( status == Z_OK );

    uint32_t wsize = (uint32_t)csize;

    fwrite( &wsize, sizeof(wsize), 1, f );

    int written = fwrite( tmp, csize, 1, f );

    g_free(tmp);

    /* Could be finer-grained, but this is enough to know it succeeded/failed */

    if( written == 1 ) {

        return count;

    } else {

        return 0;

    }

}

int fread_gzip( void *p, size_t sz, size_t count, FILE *f )

{

    uLongf size = sz*count;

    uint32_t csize;

    unsigned char *tmp;

    fread( &csize, sizeof(csize), 1, f );

    assert( csize <= (size*2) );

    tmp = g_malloc0( csize );

    fread( tmp, csize, 1, f );

    int status = uncompress( p, &size, tmp, csize );

    g_free(tmp);

    if( status == Z_OK ) {

        return count;

    } else {

        fprintf( stderr, "Error reading compressed data\n" );

        return 0;

    }

}

void fwrite_dump( unsigned char *data, unsigned int length, FILE *f ) 

{

    unsigned int i, j;

    for( i =0; i<length; i+=16 ) {

        fprintf( f, "%08X:", i);

        for( j=i; j<i+16; j++ ) {

            if( (j % 4) == 0 )

                fprintf( f, " " );

            if( j < length )

                fprintf( f, " %02X", (unsigned int)(data[j]) );

            else

                fprintf( f, "   " );

        }

        fprintf( f, "  " );

        for( j=i; j<i+16 && j<length; j++ ) {

            fprintf( f, "%c", isprint(data[j]) ? data[j] : '.' );

        }

        fprintf( f, "\n" );

    }

}

void fwrite_dump32( unsigned int *data, unsigned int length, FILE *f ) 

{

    fwrite_dump32v( data, length, 8, f );

}

void fwrite_dump32v( unsigned int *data, unsigned int length, int wordsPerLine, FILE *f ) 

{

    unsigned int i, j;

    for( i =0; i<length>>2; i+=wordsPerLine ) {

        fprintf( f, "%08X:", i);

        for( j=i; j<i+wordsPerLine; j++ ) {

            if( j < length )

                fprintf( f, " %08X", (unsigned int)(data[j]) );

            else

                fprintf( f, "         " );

        }

        fprintf( f, "\n" );

    }

}

gboolean write_png_to_stream( FILE *f, frame_buffer_t buffer )

{

    int coltype, i;

    png_bytep p;

    png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);

    if (!png_ptr) {

        return FALSE;

    }

    png_infop info_ptr = png_create_info_struct(png_ptr);

    if (!info_ptr) {

        png_destroy_write_struct(&png_ptr, NULL);

        return FALSE;

    }

    if( setjmp(png_jmpbuf(png_ptr)) ) {

        png_destroy_write_struct(&png_ptr, &info_ptr);

        return FALSE;

    }

    png_init_io( png_ptr, f );

    switch( buffer->colour_format ) {

    case COLFMT_BGR888:

        coltype = PNG_COLOR_TYPE_RGB;

        break;

    case COLFMT_BGRA8888:

        coltype = PNG_COLOR_TYPE_RGB_ALPHA;

        break;

    case COLFMT_BGR0888:

        coltype = PNG_COLOR_TYPE_RGB;

        break;

    default:

        coltype = PNG_COLOR_TYPE_RGB;

    }

    png_set_IHDR(png_ptr, info_ptr, buffer->width, buffer->height,

                 8, coltype, PNG_INTERLACE_NONE, 

                 PNG_COMPRESSION_TYPE_DEFAULT, 

                 PNG_FILTER_TYPE_DEFAULT );

    png_write_info(png_ptr, info_ptr);

    if( buffer->colour_format == COLFMT_BGR0888 ) {

        png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);

    }

    png_set_bgr(png_ptr);

    if( buffer->inverted ) {

        p = (png_bytep)(buffer->data + (buffer->height*buffer->rowstride) - buffer->rowstride);

        for(i=0; i<buffer->height; i++ ) {

            png_write_row(png_ptr, p);

            p-=buffer->rowstride;

        }

    } else {

        p = (png_bytep)buffer->data;

        for(i=0; i<buffer->height; i++ ) {

            png_write_row(png_ptr, p);

            p+=buffer->rowstride;

        }

    }

    png_write_end(png_ptr, info_ptr);

    png_destroy_write_struct(&png_ptr, &info_ptr);

    return TRUE;

}

frame_buffer_t read_png_from_stream( FILE *f )

{

    png_bytep p;

    int i;

    png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, 

            NULL, NULL, NULL);

    if (!png_ptr) {

        return NULL;

    }

    png_infop info_ptr = png_create_info_struct(png_ptr);

    if (!info_ptr) {

        png_destroy_read_struct(&png_ptr, NULL, NULL);

        return NULL;

    }

    png_infop end_info = png_create_info_struct(png_ptr);

    if (!end_info) {

        png_destroy_read_struct(&png_ptr, &info_ptr, NULL );

        return NULL;

    }

    if( setjmp(png_jmpbuf(png_ptr)) ) {

        png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

        return NULL;

    }

    png_init_io(png_ptr, f);

    png_read_info(png_ptr, info_ptr);

    png_uint_32 width, height;

    int bit_depth, color_type, interlace_type,

    compression_type, filter_method;

    png_get_IHDR(png_ptr, info_ptr, &width, &height,

                 &bit_depth, &color_type, &interlace_type,

                 &compression_type, &filter_method);

    assert( interlace_type == PNG_INTERLACE_NONE );

    int rowbytes = png_get_rowbytes(png_ptr, info_ptr);

    int channels = png_get_channels(png_ptr, info_ptr);

    frame_buffer_t buffer = g_malloc( sizeof(struct frame_buffer) + rowbytes*height );

    buffer->data = (unsigned char *)(buffer+1);

    buffer->width = width;

    buffer->height = height;

    buffer->rowstride = rowbytes;

    buffer->address = -1;

    buffer->size = rowbytes*height;

    buffer->inverted = FALSE;

    if( channels == 4 ) {

        buffer->colour_format = COLFMT_BGRA8888;

    } else if( channels == 3 ) {

        buffer->colour_format = COLFMT_RGB888;

    }

    p = (png_bytep)buffer->data;

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

        png_read_row(png_ptr, p, NULL );

        p += rowbytes;

    }

    png_read_end(png_ptr, end_info);

    png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);

    return buffer;

}

int get_log_level_from_string( const gchar *str )

{

    switch( tolower(str[0]) ) {

    case 'd': return EMIT_DEBUG;

    case 'e': return EMIT_ERR;

    case 'f': return EMIT_FATAL;

    case 'i': return EMIT_INFO;

    case 't': return EMIT_TRACE;

    case 'w': return EMIT_WARN;

    default: return -1;

    }

}

gboolean set_global_log_level( const gchar *str ) 

{

    int l = get_log_level_from_string(str);

    if( l == -1 ) {

        return FALSE;

    } else {

        global_msg_level = l;

        return TRUE;

    }

}

void log_message( void *ptr, int level, const gchar *source, const char *msg, ... )

{

    char buf[20];

    time_t tm = time(NULL);

    va_list ap;

    if( level > global_msg_level ) {

        return; // ignored

    }

    va_start(ap, msg);

    gchar *text = g_strdup_vprintf( msg, ap );

    va_end(ap);

    if( level <= EMIT_ERR ) {

        if( gui_error_dialog( text ) ) {

            g_free(text);

            // If we're running, halt on error to avoid potentially flooding

            // the user with error messages.

            if( dreamcast_is_running() ) {

                dreamcast_stop();

            }

            return;

        }

    }

    strftime( buf, sizeof(buf), "%H:%M:%S", localtime(&tm) );

    fprintf( stderr, "%s %08X %-5s %s\n", buf, sh4r.pc, msg_levels[level], text );

    g_free(text);

}