/* Copyright 2014 Adobe Systems Incorporated (http://www.adobe.com/). All Rights Reserved.
   This software is licensed as OpenSource, under the Apache License, Version 2.0.
   This license is available at: http://opensource.org/licenses/Apache-2.0. */

#include "Dglobal.h"
#include "Dsfnt.h"
#include "sfnt_sfnt.h"

#include "Dda.h"
#include "Dsys.h"
#include <ctype.h>
#include <string.h>
#include <stdbool.h>

Byte8 *version = "3.0.1"; /* Program version */

static char *sourcepath = "";
#include "setjmp.h"

jmp_buf mark;
#define MAX_ARGS 200

char *MakeFullPath(char *source) {
    char *dest;

    dest = (char *)malloc(256);
    sprintf(dest, "%s\\%s", sourcepath, source);
    return dest;
}

/* Print usage information */
static void printUsage(void) {
    printf(
        "Usage: %s [-u|-h] [-T] [-d <level>] [-x<tags>|-i<tags>] "
        "<FONTS|DIRS>\n"
        "OR: %s  -X <scriptfile>\n\n"
        "where: <FONTS|DIRS> is:\n"
        "\t    <fontfile1> <fontfile2>\n"
        "\tOR: <fontfile> <otherfontdir>\n"
        "\tOR: <fontdir1> <fontdir2>\n "
        "\nOptions:\n"
        "    -u  print usage information\n"
        "    -h  print usage and help information\n"
        "    -T  show time-stamp of font files\n"
        "    -d  set diff level of detail\n"
        "    -x  exclude table(s)   _OR_\n"
        "    -i  include table(s) e.g., -iname,head\n"
        "Version:\n"
        "    %s\n",
        global.progname,
        global.progname,
        version);
}

/* Show usage information */
static void showUsage(void) {
    printUsage();
}

/* Show usage and help information */
static void showHelp(void) {
    printUsage();
    printf(
        "Notes:\n"
        "    -d <level>  : level of detail in indicating differences\n"
        "        0: (default) indicate if there is a difference\n"
        "            in a particular table\n"
        "        1: indicate the byte-position within the table where\n"
        "            a difference begins\n"
        "        2: dump the tables in a Hex format and produce\n"
        "            a line-by-line diff\n"
        "        3: if the contents of the table is amenable, compare\n"
        "            the data-structures specific to that table, and\n"
        "            produce the differences in the fields of the\n"
        "            data-structures of the two files\n"
        "        4: a possibly more-verbose version of level 3\n");
    printf(
        "    -x <tag>[,<tag>]*\n"
        "        exclude one or more tables from comparisons.\n"
        "        e.g., -x cmap,name\n"
        "        will skip inspecting/comparing the 'cmap' and 'name' tables\n");
    printf(
        "    -i <tag>[,<tag>]*\n"
        "        include one or more tables for comparisons.\n"
        "        e.g., -i cmap,name\n"
        "        will inspect/compare ONLY the 'cmap' and 'name' tables\n");
    printf("    -i and -x switches are exclusive of each other.\n");
}

/* Main program */
IntN main(IntN argc, Byte8 *argv[]) {
    static opt_Option opt[] =
        {
            {"-u", opt_Call, showUsage},
            {"-h", opt_Call, showHelp},
            {"-T", opt_Flag},
            {"-x", sfntTagScan},
            {"-i", sfntTagScan},
            {"-d", opt_Int, &level, "0", 0, 4},
        };

    IntN argi;
    bool supported, supported2;
    Byte8 *filename1;
    Byte8 *filename2;
    IntN name1isDir, name2isDir;
    Byte8 **SimpleNameList;
    IntN NumSimpleNames = 0;

    da_SetMemFuncs(memNew, memResize, memFree);
    global.progname = "sfntdiff";

    argi = opt_Scan(argc, argv, opt_NOPTS(opt), opt, NULL, NULL);

    if (opt_Present("-u") || opt_Present("-h")) return 0;

    if (opt_Present("-x") && opt_Present("-i")) {
        printf("ERROR: '-x' switch and '-i' switch are exclusive of each other.\n");
        showUsage();
        return 1;
    }

    if (level > 4) level = 4;

    if ((argc - argi) < 2) {
        printf("ERROR: not enough files/directories specified.\n");
        showUsage();
        return 1;
    }

    filename1 = argv[argi];
    filename2 = argv[argi + 1];

    name1isDir = sysIsDir(filename1);
    name2isDir = sysIsDir(filename2);

    printf("%s\n", ourtime());
    printf("%s (%s) (-d %d)  files:\n", global.progname, version, level);

    if (!name1isDir && !name2isDir) {
        if (!fileIsOpened(1)) fileOpen(1, filename1);
        if (!fileIsOpened(2)) fileOpen(2, filename2);

        if (opt_Present("-T")) {
            printf("< %s\t%s\n", filename1, fileModTimeString(1, filename1));
            printf("> %s\t%s\n", filename2, fileModTimeString(2, filename2));
        } else {
            printf("< %s\n", filename1);
            printf("> %s\n", filename2);
        }

        /* See if we can recognize the file type */
        supported = isSupportedFontFormat(fileSniff(1), filename1);
        supported2 = isSupportedFontFormat(fileSniff(2), filename2);

        if (!supported || !supported2) {
            fileClose(1);
            fileClose(2);
            quit(1);
        }

        sfntRead(0, -1, 0, -1); /* Read plain sfnt file */
        sfntDump();
        sfntFree();
        fileClose(1);
        fileClose(2);
    } else if (name1isDir && name2isDir) {
        Byte8 fil1[MAX_PATH];
        Byte8 fil2[MAX_PATH];
        IntN nn;

        NumSimpleNames = sysReadInputDir(filename1, &SimpleNameList);
        for (nn = 0; nn < NumSimpleNames; nn++) {
            strcpy(fil1, filename1);
            strcat(fil1, sysPathSep);
            strcat(fil1, SimpleNameList[nn]);

            strcpy(fil2, filename2);
            strcat(fil2, sysPathSep);
            strcat(fil2, SimpleNameList[nn]);

            fileOpen(1, fil1);
            fileOpen(2, fil2);

            printf("\n---------------------------------------------\n");
            if (opt_Present("-T")) {
                printf("< %s\t%s\n", fil1, fileModTimeString(1, fil1));
                printf("> %s\t%s\n", fil2, fileModTimeString(2, fil2));
            } else {
                printf("< %s\n", fil1);
                printf("> %s\n", fil2);
            }

            /* See if we can recognize the file type */
            supported = isSupportedFontFormat(fileSniff(1), fil1);
            supported2 = isSupportedFontFormat(fileSniff(2), fil2);

            if (!supported || !supported2) {
                fileClose(1);
                fileClose(2);
                continue;
            }

            sfntRead(0, -1, 0, -1); /* Read plain sfnt file */
            sfntDump();
            sfntFree();
            fileClose(1);
            fileClose(2);
        }
    } else if (!name1isDir && name2isDir) {
        Byte8 fil2[MAX_PATH];
        Byte8 *c;

        strcpy(fil2, filename2);
        strcat(fil2, sysPathSep);
        c = strrchr(filename1, sysPathSep[0]);
        if (c == NULL)
            strcat(fil2, filename1);
        else
            strcat(fil2, ++c);

        fileOpen(1, filename1);
        fileOpen(2, fil2);

        if (opt_Present("-T")) {
            printf("< %s\t%s\n", filename1, fileModTimeString(1, filename1));
            printf("> %s\t%s\n", fil2, fileModTimeString(2, fil2));
        } else {
            printf("< %s\n", filename1);
            printf("> %s\n", fil2);
        }

        /* See if we can recognize the file type */
        supported = isSupportedFontFormat(fileSniff(1), filename1);
        supported2 = isSupportedFontFormat(fileSniff(2), fil2);

        if (!supported || !supported2) {
            fileClose(1);
            fileClose(2);
            quit(1);
        }

        sfntRead(0, -1, 0, -1); /* Read plain sfnt file */
        sfntDump();
        sfntFree();
        fileClose(1);
        fileClose(2);
    } else {
        printf("ERROR: Incorrect/insufficient files/directories specified.\n");
        showUsage();
        return 1;
    }
    return 0;
}