/*

Copyright (c) 2008 Carl Byington - 510 Software Group, released under
the GPL version 2 or any later version at your choice available at
http://www.fsf.org/licenses/gpl.txt

Based on readpst.c by David Smith

*/
#include <gd.h>
#include <stdio.h>
#include <iostream>
#include <unistd.h>
#include <string>
#include <vector>

using namespace std;

extern "C" {
    #include "define.h"
    #include "libstrfunc.h"
    #include "libpst.h"
    #include "common.h"
    #include "timeconv.h"
    #include "lzfu.h"
}

struct file_ll {
    string  name;
    int32_t stored_count;
    int32_t email_count;
    int32_t skip_count;
    int32_t type;
    file_ll() {
        stored_count = 0;
        email_count  = 0;
        skip_count   = 0;
        type         = 0;
    };
};

// global settings
const char*    convert = "@CONVERT@";     // fully qualified path of the convert program from image magick
const char*    prog_name = NULL;          // our arg0 name
const char*    bates_prefix = "";         // string to prefix bates numbers
int            bates_index = 0;           // current bates sequence
const char*    output_directory = ".";
const char*    output_file = "load.dii";
char*    font_file = NULL;
int      bates_color = 0xff0000;    // color of bates header stamp
int      email_sequence = 0;        // current pdf sequence number
char     pdf_name[PATH_MAX];        // current pdf file name
FILE*    dii_file = NULL;           // the output dii load file
pst_file pstfile;                   // the input pst file

// pdf writer globals
bool     pdf_open = false;          // is pdf writer started
char*    pst_folder;                // current folder name
int      page_sequence;             // current page number
string   conversion;                // conversion command
vector<string>  png_names;

// png writer globals
bool     png_open = false;          // is current page open
int      line_height;               // in pixels
int      char_width;                // in pixels
int      col_number, col_max;       // in characters
int      line_number, line_max;     // lines per page
int      x_position, y_position;    // in pixels
int      black, red;                // text colors
gdImagePtr  image;                  // current gd image

const int DPI         = 300;
const double sz       = 10.0;
const int margin      = DPI/2;
const int LINE_SIZE   = 2000;
const int PAGE_WIDTH  = DPI*17/2;
const int PAGE_HEIGHT = DPI*11;

// max size of the c_time char*. It will store the date of the email
#define C_TIME_SIZE 500

static void open_png();
static void close_png();


static void version();
static void version()
{
    printf("pst2dii v%s\n", VERSION);
#if BYTE_ORDER == BIG_ENDIAN
    printf("Big Endian implementation being used.\n");
#elif BYTE_ORDER == LITTLE_ENDIAN
    printf("Little Endian implementation being used.\n");
#else
#  error "Byte order not supported by this library"
#endif
#ifdef __GNUC__
    printf("GCC %d.%d : %s %s\n", __GNUC__, __GNUC_MINOR__, __DATE__, __TIME__);
#endif
}


static void usage();
static void usage()
{
    version();
    printf("Usage: %s [OPTIONS] {PST FILENAME}\n", prog_name);
    printf("OPTIONS:\n");
    printf("\t-B bates-prefix   \t- Set the bates prefix string\n");
    printf("\t-O dii-output-file\t- Set the dii load file output filename\n");
    printf("\t-V                \t- Version. Display program version\n");
    printf("\t-b bates-number   \t- Set the starting bates sequence number\n");
    printf("\t-c bates-color    \t- Specify the color of the bates stamps as 6 digit hex\n");
    printf("\t-d filename       \t- Debug to file. This is a binary log. Use readpstlog to print it.\n");
    printf("\t-f ttf-font-file  \t- Set the font file\n");
    printf("\t-h                \t- Help. This screen\n");
    printf("\t-o dirname        \t- Output directory to write files to.\n");
}


static char *removeCR (char *c);
static char *removeCR (char *c) {
    // converts /r/n to /n
    char *a, *b;
    DEBUG_ENT("removeCR");
    a = b = c;
    while (*a != '\0') {
        *b = *a;
        if (*a != '\r')
            b++;
        a++;
    }
    *b = '\0';
    DEBUG_RET();
    return c;
}


// The sole purpose of this function is to bypass the pseudo-header prologue
// that Microsoft Outlook inserts at the beginning of the internet email
// headers for emails stored in their "Personal Folders" files.
static char *skip_header_prologue(char *headers);
static char *skip_header_prologue(char *headers) {
    const char *bad = "Microsoft Mail Internet Headers";
    if (strncmp(headers, bad, strlen(bad)) == 0) {
        // Found the offensive header prologue
        char *pc = strchr(headers, '\n');
        return pc + 1;
    }
    return headers;
}


static void check_filename(string &fname);
static void check_filename(string &fname) {
    char *t = strdup(fname.c_str());
    DEBUG_ENT("check_filename");
    if (!t) {
        DEBUG_RET();
        return;
    }
    char *tt = t;
    bool fixed = false;
    while ((t = strpbrk(t, " /\\:"))) {
        // while there are characters in the second string that we don't want
        *t = '_'; //replace them with an underscore
        fixed = true;
    }
    if (fixed) fname = string(tt);
    free(tt);
    DEBUG_RET();
}


static string write_separate_attachment(string fname, pst_item_attach* current_attach, int attach_num, pst_file* pst);
static string write_separate_attachment(string fname, pst_item_attach* current_attach, int attach_num, pst_file* pst)
{
    FILE *fp = NULL;
    int x = 0;
    char *temp = NULL;

    // If there is a long filename (filename2) use that, otherwise
    // use the 8.3 filename (filename1)
    char *attach_filename = (current_attach->filename2) ? current_attach->filename2
                                                        : current_attach->filename1;
    DEBUG_ENT("write_separate_attachment");
    check_filename(fname);
    const char* f_name = fname.c_str();
    DEBUG_EMAIL(("dirname=%s, pathname=%s, filename=%s\n", output_directory, f_name, attach_filename));
    int len = strlen(output_directory) + 1 + strlen(f_name) + 15;
    if (!attach_filename) {
        // generate our own (dummy) filename for the attachement
        temp = (char*)xmalloc(len);
        sprintf(temp, "%s/%s_attach%i", output_directory, f_name, attach_num);
    } else {
        // have an attachment name, make sure it's unique
        temp = (char*)xmalloc(len+strlen(attach_filename));
        do {
            if (fp) fclose(fp);
            if (x == 0)
                sprintf(temp, "%s/%s_%s", output_directory, f_name, attach_filename);
            else
                sprintf(temp, "%s/%s_%s-%i", output_directory, f_name, attach_filename, x);
        } while ((fp = fopen(temp, "r")) && ++x < 99999999);
        if (x > 99999999) {
            DIE(("error finding attachment name. exhausted possibilities to %s\n", temp));
        }
    }
    DEBUG_EMAIL(("Saving attachment to %s\n", temp));
    if (!(fp = fopen(temp, "wb"))) {
        WARN(("write_separate_attachment: Cannot open attachment save file \"%s\"\n", temp));
    } else {
        if (current_attach->data)
            pst_fwrite(current_attach->data, 1, current_attach->size, fp);
        else {
            (void)pst_attach_to_file(pst, current_attach, fp);
        }
        fclose(fp);
    }
    string rc(temp);
    if (temp) free(temp);
    DEBUG_RET();
    return rc;
}


static void print_pdf_short(const char *line, int len, int color);
static void print_pdf_short(const char *line, int len, int color)
{
    if (line_number >= line_max) {
        close_png();
        open_png();
    }
    int brect[8];
    gdFTStringExtra strex;
    strex.flags       = gdFTEX_RESOLUTION;
    strex.linespacing = 1.20;
    strex.charmap     = 0;
    strex.hdpi        = DPI;
    strex.vdpi        = DPI;
    char xline[len+1];
    memcpy(xline, line, len);
    xline[len] = '\0';
    char *p;
    char *l = xline;
    while ((p = strchr(l, '&'))) {
        *p = '\0';
        char *err = gdImageStringFTEx(image, &brect[0], color, font_file, sz, 0.0, x_position, y_position, l, &strex);
        if (err) printf(err);
        x_position += (brect[2]-brect[6]);
        l = p+1;
        err = gdImageStringFTEx(image, &brect[0], color, font_file, sz, 0.0, x_position, y_position, (char*)"&amp;", &strex);
        if (err) printf(err);
        x_position += (brect[2]-brect[6]);
    }
    char *err = gdImageStringFTEx(image, &brect[0], color, font_file, sz, 0.0, x_position, y_position, l, &strex);
    if (err) printf(err);
    x_position += (brect[2]-brect[6]);
    col_number += len;
}


static void new_line();
static void new_line()
{
    y_position  += line_height;
    line_number += 1;
    x_position   = margin;
    col_number   = 0;
}


static void print_pdf_single(const char *line, int color);
static void print_pdf_single(const char *line, int color)
{
    while (*line == '\t') {
        char blanks[5];
        memset(blanks, ' ', 5);
        print_pdf_short(blanks, 4, color);
        line++;
        if (col_number >= col_max) new_line();
    }
    int n = strlen(line);
    while (n) {
        int m = col_max - col_number;   // number of chars that will fit on this line
        m = (n > m) ? m : n;
        print_pdf_short(line, m, color);
        line += m;
        n    -= m;
        if (n) new_line();
    }
}


static void print_pdf_only(const char *line, int color);
static void print_pdf_only(const char *line, int color)
{
    char *p;
    while ((p = strchr(line, '\n'))) {
        *p = '\0';
        print_pdf_single(line, color);
        *p = '\n';
        line = p+1;
        new_line();
    }
    print_pdf_single(line, color);
}


static void print_pdf(const char *line);
static void print_pdf(const char *line)
{
    pst_fwrite(line, 1, strlen(line), dii_file);
    print_pdf_only(line, black);
}


static void open_png()
{
    if (!png_open) {
        png_open  = true;
        int brect[8];
        image = gdImageCreate(PAGE_WIDTH, PAGE_HEIGHT);
                gdImageColorAllocate(image, 255, 255, 255); // background color first one allocated
        black = gdImageColorAllocate(image, 0, 0, 0);
        int r = (bates_color & 0xff0000) >> 16;
        int g = (bates_color & 0x00ff00) >> 8;
        int b = (bates_color & 0x0000ff);
        red   = gdImageColorAllocate(image, r, g, b);

        gdFTStringExtra strex;
        strex.flags       = gdFTEX_RESOLUTION;
        strex.linespacing = 1.20;
        strex.charmap     = 0;
        strex.hdpi        = DPI;
        strex.vdpi        = DPI;

        char line[LINE_SIZE];
        char *err = gdImageStringFTEx(NULL, &brect[0], black, font_file, sz, 0.0, margin, margin, (char*)"LMgqQ", &strex);
        if (err) printf(err);
        line_height = (brect[3]-brect[7]) * 12/10;
        char_width  = (brect[2]-brect[6]) / 5;
        col_number  = 0;
        col_max     = (PAGE_WIDTH - margin*2) / char_width;
        line_number = 0;
        line_max    = (PAGE_HEIGHT - margin*2) / line_height;
        x_position  = margin;
        y_position  = margin + line_height;
        snprintf(line, sizeof(line), "%s%06d\n", bates_prefix, bates_index++);
        print_pdf_only(line, red);
        print_pdf_only(pst_folder, red);
    }
}


static void close_png()
{
    if (png_open) {
        png_open = false;
        char fn[PATH_MAX];
        snprintf(fn, sizeof(fn), "page%d.png", ++page_sequence);
        FILE *pngout = fopen(fn, "wb");
        if (pngout) {
            gdImagePng(image, pngout);
            fclose(pngout);
        }
        gdImageDestroy(image); // free memory
        png_names.push_back(fn);
        conversion += string(" ") + fn;
    }
}


static void open_pdf(char *line);
static void open_pdf(char *line)
{
    pst_folder    = line;
    page_sequence = 0;
    conversion    = string(convert);
    png_names.clear();
    open_png();
    snprintf(pdf_name, sizeof(pdf_name), "dii%06d", ++email_sequence);
    fprintf(dii_file, "\n@T %s\n", pdf_name);
    snprintf(pdf_name, sizeof(pdf_name), "%s/dii%06d.pdf", output_directory, email_sequence);
}


static void close_pdf();
static void close_pdf()
{
    close_png();
    conversion += string(" ") + pdf_name;
    system(conversion.c_str());
    for (vector<string>::iterator i=png_names.begin(); i!=png_names.end(); i++) {
        remove((*i).c_str());
    }
    fprintf(dii_file, "@D %s\n", pdf_name);
}


static void write_simple(const char *tag, const char *value);
static void write_simple(const char *tag, const char *value)
{
    if (value) fprintf(dii_file, "@%s %s\n", tag, value);
}


static void write_simple(const char *tag, string value);
static void write_simple(const char *tag, string value)
{
    fprintf(dii_file, "@%s %s\n", tag, value.c_str());
}


static void write_simple(const char *tag, const char *value, const char *value2);
static void write_simple(const char *tag, const char *value, const char *value2)
{
    if (value) {
    if (value2) fprintf(dii_file, "@%s \"%s\" <%s>\n", tag, value, value2);
    else        fprintf(dii_file, "@%s \"%s\"\n", tag, value);
    }
}


static string extract_header(char *headers, const char *field);
static string extract_header(char *headers, const char *field)
{
    string rc;
    int len = strlen(field) + 4;
    char f[len];
    snprintf(f, len, "\n%s: ", field);
    char *p = strstr(headers, f);
    if (p) {
        p += strlen(f);
        char *n = strchr(p, '\n');
        if (n) {
            *n = '\0';
            rc = string(p);
            *n = '\n';
        }
        else {
            rc = string(p);
        }
    }
    return rc;
}


static void write_normal_email(file_ll &f, pst_item* item, pst_file* pst);
static void write_normal_email(file_ll &f, pst_item* item, pst_file* pst)
{
    DEBUG_ENT("write_normal_email");
    char *soh = NULL;  // real start of headers.
    if (item->email->header) {
        // some of the headers we get from the file are not properly defined.
        // they can contain some email stuff too. We will cut off the header
        // when we see a \n\n or \r\n\r\n
        removeCR(item->email->header);
        char *temp = strstr(item->email->header, "\n\n");
        if (temp) {
            DEBUG_EMAIL(("Found body text in header\n"));
            temp[1] = '\0'; // stop after first \n
        }
        soh = skip_header_prologue(item->email->header);
    }

    char folder_line[LINE_SIZE];
    char line[LINE_SIZE];
    // reset pdf writer to new file
    int bates = bates_index;    // save starting index
    snprintf(folder_line, sizeof(folder_line), "pst folder = %s\n", f.name.c_str());
    open_pdf(folder_line);

    // start printing this email
    fprintf(dii_file, "@FOLDERNAME %s\n", f.name.c_str());
    string myfrom = extract_header(soh, "From");
    string myto   = extract_header(soh, "To");
    string mycc   = extract_header(soh, "Cc");
    string mybcc  = extract_header(soh, "Bcc");
    if (myfrom.empty()) write_simple("FROM", item->email->outlook_sender_name, item->email->sender_address);
    else                write_simple("FROM", myfrom);
    if (myto.empty())   write_simple("TO",   item->email->sentto_address,      item->email->recip_address);
    else                write_simple("TO", myto);
    if (mycc.empty())   write_simple("CC",   item->email->cc_address);
    else                write_simple("CC", mycc);
    if (mybcc.empty())  write_simple("BCC",  item->email->bcc_address);
    else                write_simple("BCC", mybcc);
    if (item->email->sent_date) {
        time_t t = fileTimeToUnixTime(item->email->sent_date, NULL);
        char c_time[C_TIME_SIZE];
        strftime(c_time, C_TIME_SIZE, "%F", gmtime(&t));
        write_simple("DATESENT", c_time);
        strftime(c_time, C_TIME_SIZE, "%T+0000", gmtime(&t));
        write_simple("TIMESENT", c_time);
    }
    if (item->email->arrival_date) {
        time_t t = fileTimeToUnixTime(item->email->arrival_date, NULL);
        char c_time[C_TIME_SIZE];
        strftime(c_time, C_TIME_SIZE, "%F", gmtime(&t));
        write_simple("DATERCVD", c_time);
        strftime(c_time, C_TIME_SIZE, "%T+0000", gmtime(&t));
        write_simple("TIMERCVD", c_time);
    }
    if (item->email->subject) {
        write_simple("SUBJECT", item->email->subject->subj);
    }
    write_simple("MSGID", item->email->messageid);
    if (item->email->flag) {
        write_simple("READ", (item->email->flag & 1) ? "Y" : "N");
    }

    DEBUG_EMAIL(("About to print Header\n"));
    fprintf(dii_file, "@HEADER\n");

    if (item && item->email && item->email->subject && item->email->subject->subj) {
        DEBUG_EMAIL(("item->email->subject->subj = %s\n", item->email->subject->subj));
    }

    if (soh) {
        // Now, write out the header...
        print_pdf(soh);
        int len = strlen(soh);
        if (!len || (soh[len-1] != '\n')) {
            snprintf(line, sizeof(line), "\n");
            print_pdf(line);
        }

    } else {
        //make up our own headers
        const char *temp = item->email->outlook_sender;
        if (!temp) temp = "";
        snprintf(line, sizeof(line), "From: \"%s\" <%s>\n", item->email->outlook_sender_name, temp);
        print_pdf(line);

        if (item->email->subject) {
            snprintf(line, sizeof(line), "Subject: %s\n", item->email->subject->subj);
        } else {
            snprintf(line, sizeof(line), "Subject: \n");
        }
        print_pdf(line);

        snprintf(line, sizeof(line), "To: %s\n", item->email->sentto_address);
        print_pdf(line);

        if (item->email->cc_address) {
            snprintf(line, sizeof(line), "Cc: %s\n", item->email->cc_address);
            print_pdf(line);
        }

        if (item->email->sent_date) {
            time_t em_time = fileTimeToUnixTime(item->email->sent_date, 0);
            char c_time[C_TIME_SIZE];
            strftime(c_time, C_TIME_SIZE, "%a, %d %b %Y %H:%M:%S %z", gmtime(&em_time));
            snprintf(line, sizeof(line), "Date: %s\n", c_time);
            print_pdf(line);
        }
    }
    snprintf(line, sizeof(line), "\n");
    print_pdf_only(line, black);
    fprintf(dii_file, "@HEADER-END\n");

    DEBUG_EMAIL(("About to print Body\n"));
    fprintf(dii_file, "@EMAIL-BODY\n");
    if (item->email->body) {
        removeCR(item->email->body);
        print_pdf(item->email->body);
    } else if (item->email->htmlbody) {
        removeCR(item->email->htmlbody);
        print_pdf(item->email->htmlbody);
    } else if (item->email->encrypted_body || item->email->encrypted_htmlbody) {
        print_pdf("The body of this email is encrypted. This isn't supported yet, but the body is now an attachment\n");
    }
    fprintf(dii_file, "@EMAIL-END\n");

    int attach_num = 0;
    for (pst_item_attach* current_attach = item->attach; current_attach; current_attach = current_attach->next) {
        DEBUG_EMAIL(("Attempting Attachment encoding\n"));
        if (!current_attach->data) {
            DEBUG_EMAIL(("Data of attachment is NULL!. Size is supposed to be %i\n", current_attach->size));
        }
        string an = write_separate_attachment(f.name, current_attach, ++attach_num, pst);
        fprintf(dii_file, "@EATTACH %s\n", an.c_str());
    }
    close_pdf();
    fprintf(dii_file, "@BATESBEG %d\n", bates);
    fprintf(dii_file, "@BATESEND %d\n", bates_index-1);
    DEBUG_RET();
}


static void create_enter_dir(file_ll &f, file_ll *parent, pst_item *item);
static void create_enter_dir(file_ll &f, file_ll *parent, pst_item *item)
{
    f.email_count  = 0;
    f.skip_count   = 0;
    f.type         = item->type;
    f.stored_count = (item->folder) ? item->folder->email_count : 0;
    f.name         = ((parent) ? parent->name + "/" : "") + string(item->file_as);
}


static void close_enter_dir(file_ll &f);
static void close_enter_dir(file_ll &f)
{
}


static void process(pst_item *outeritem, file_ll *parent, pst_desc_ll *d_ptr);
static void process(pst_item *outeritem, file_ll *parent, pst_desc_ll *d_ptr)
{
    file_ll ff;
    pst_item *item = NULL;
    DEBUG_ENT("process");
    create_enter_dir(ff, parent, outeritem);
    while (d_ptr) {
        if (d_ptr->desc) {
            item = pst_parse_item(&pstfile, d_ptr);
            DEBUG_INFO(("item pointer is %p\n", item));
            if (item) {
                if (item->folder && d_ptr->child )  {
                    //if this is a non-empty folder, we want to recurse into it
                    fprintf(stderr, "entering folder %s\n", item->file_as);
                    process(item, &ff, d_ptr->child);
                } else if (item->email && (item->type == PST_TYPE_NOTE || item->type == PST_TYPE_REPORT || item->type == PST_TYPE_OTHER)) {
                    ff.email_count++;
                    DEBUG_MAIN(("main: Processing Email\n"));
                    if ((ff.type != PST_TYPE_NOTE) && (ff.type != PST_TYPE_REPORT) && (ff.type != PST_TYPE_OTHER)) {
                        DEBUG_MAIN(("main: I have an email, but the folder isn't an email folder. Processing anyway\n"));
                    }
                    write_normal_email(ff, item, &pstfile);
                }
                pst_freeItem(item);
            } else {
                ff.skip_count++;
                DEBUG_MAIN(("main: A NULL item was seen\n"));
            }
        }
        d_ptr = d_ptr->next;
    }
    close_enter_dir(ff);
    DEBUG_RET();
}


int main(int argc, char* const* argv)
{
    pst_desc_ll *d_ptr;
    char *fname = NULL;
    char c;
    char *d_log = NULL;
    prog_name = argv[0];
    pst_item *item = NULL;

    while ((c = getopt(argc, argv, "B:b:c:d:f:o:O:Vh"))!= -1) {
        switch (c) {
        case 'B':
            bates_prefix = optarg;
            break;
        case 'b':
            bates_index = atoi(optarg);
            break;
        case 'c':
            bates_color = (int)strtol(optarg, (char**)NULL, 16);
            break;
        case 'f':
            font_file = optarg;
            break;
        case 'o':
            output_directory = optarg;
            break;
        case 'O':
            output_file = optarg;
            break;
        case 'd':
            d_log = optarg;
            break;
        case 'h':
            usage();
            exit(0);
            break;
        case 'V':
            version();
            exit(0);
            break;
        default:
            usage();
            exit(1);
            break;
        }
    }

    if (argc > optind) {
        fname = argv[optind];
    } else {
        usage();
        exit(2);
    }


    #ifdef DEBUG_ALL
        // force a log file
        if (!d_log) d_log = "pst2dii.log";
    #endif
    DEBUG_INIT(d_log);
    DEBUG_REGISTER_CLOSE();
    DEBUG_ENT("main");
    RET_DERROR(pst_open(&pstfile, fname), 1, ("Error opening File\n"));
    RET_DERROR(pst_load_index(&pstfile), 2, ("Index Error\n"));

    pst_load_extended_attributes(&pstfile);

    d_ptr = pstfile.d_head; // first record is main record
    item  = (pst_item*)pst_parse_item(&pstfile, d_ptr);
    if (!item || !item->message_store) {
        DEBUG_RET();
        DIE(("main: Could not get root record\n"));
    }

    d_ptr = pst_getTopOfFolders(&pstfile, item);
    if (!d_ptr) {
        DEBUG_RET();
        DIE(("Top of folders record not found. Cannot continue\n"));
    }

    dii_file = fopen(output_file, "wb");
    if (dii_file) {
        process(item, NULL, d_ptr->child);  // do the children of TOPF
        pst_freeItem(item);
        pst_close(&pstfile);
        fclose(dii_file);
    }
    DEBUG_RET();
    return 0;
}