#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <limits.h>
#include <unistd.h>
#include <sys/stat.h>
#include <time.h>
#include <fts.h>
#include <errno.h>
#include "qwk.h"
#include "../../deps/jamlib/jam.h"
#include "../../src/inih/ini.h"

char *outbound_path;
char *message_base_path;
char *temp_dir;
char *pack_cmd;
char *config_file;
char *hostid;

int bases_exists = 0;

struct msg_bases {
	int baseno;
	char *path;
};

struct msg_bases **msgbases;
int msgbasecount = 0;

int recursive_delete(const char *dir) {
    int ret = 0;
    FTS *ftsp = NULL;
    FTSENT *curr;

    char *files[] = { (char *) dir, NULL };

    ftsp = fts_open(files, FTS_NOCHDIR | FTS_PHYSICAL | FTS_XDEV, NULL);
    if (!ftsp) {
        fprintf(stderr, "%s: fts_open failed: %s\n", dir, strerror(errno));
        ret = -1;
        goto finish;
    }

    while ((curr = fts_read(ftsp))) {
        switch (curr->fts_info) {
        case FTS_NS:
        case FTS_DNR:
        case FTS_ERR:
            fprintf(stderr, "%s: fts_read error: %s\n", curr->fts_accpath, strerror(curr->fts_errno));
            break;

        case FTS_DC:
        case FTS_DOT:
        case FTS_NSOK:
            break;

        case FTS_D:
            break;

        case FTS_DP:
        case FTS_F:
        case FTS_SL:
        case FTS_SLNONE:
        case FTS_DEFAULT:
            if (remove(curr->fts_accpath) < 0) {
                fprintf(stderr, "%s: Failed to remove: %s", curr->fts_path, strerror(errno));
                ret = -1;
            }
            break;
        }
    }

finish:
    if (ftsp) {
        fts_close(ftsp);
    }

    return ret;
}

s_JamBase *open_jam_base(char *path) {
	int ret;
	s_JamBase *jb;

	ret = JAM_OpenMB((char *)path, &jb);

	if (ret != 0) {
		if (ret == JAM_IO_ERROR) {
			free(jb);
			ret = JAM_CreateMB((char *)path, 1, &jb);
			if (ret != 0) {
				free(jb);
				return NULL;
			}
		} else {
			free(jb);
			return NULL;
		}
	}
	return jb;
}

static int handler(void* user, const char* section, const char* name,
                   const char* value)
{
    if (strcasecmp(section, "main") == 0) {
        if (strcasecmp(name, "message path") == 0) {
            message_base_path = strdup(value);
        } else if (strcasecmp(name, "outbound") == 0) {
            outbound_path = strdup(value);
        } else if (strcasecmp(name, "temp dir") == 0) {
            temp_dir = strdup(value);
        } else if (strcasecmp(name, "pack command") == 0) {
            pack_cmd = strdup(value);
        } else if (strcasecmp(name, "host") == 0) {
            hostid = strdup(value);
        }
    } else if (strcasecmp(section, "bases") == 0) {
		bases_exists = 1;
		if (msgbasecount == 0) {
			msgbases = (struct msg_bases **)malloc(sizeof(struct msg_bases *));
		} else {
			msgbases = (struct msg_bases **)realloc(msgbases, sizeof(struct msg_bases *) * (msgbasecount + 1));
		}
		
		msgbases[msgbasecount] = (struct msg_bases *)malloc(sizeof(struct msg_bases));
		
		msgbases[msgbasecount]->baseno = atoi(name);
		msgbases[msgbasecount]->path = strdup(value);
		msgbasecount++;
	}
    return 1;
}

int export_messages(int baseno, char *basefilename, int qwkidx) {
    int msgcount = 0;
    s_JamBase *jb;
    s_JamBaseHeader jbh;
	s_JamMsgHeader jmh;
	s_JamSubPacket* jsp;
    s_JamSubfield jsf;
    int i;
    int z;
    int len;
    int lenbytes;
    char buffer[PATH_MAX];
    struct QwkHeader qh;
    struct tm msgtm;
    FILE *fptr;
    char text[128];
    char *msgbuf;
    char *msgptr;

    snprintf(buffer, PATH_MAX, "%s/%s", message_base_path, basefilename);

    jb = open_jam_base(buffer);
    if (jb) {
        JAM_ReadMBHeader(jb, &jbh);
        if (jbh.ActiveMsgs > 0) {
            for (i=0;i<jbh.ActiveMsgs;i++) {
                memset(&jmh, 0, sizeof(s_JamMsgHeader));
                z = JAM_ReadMsgHeader(jb, i, &jmh, &jsp);

                if (z != 0) {
                    continue;
                }

                if (jmh.Attribute & JAM_MSG_DELETED) {
                    JAM_DelSubPacket(jsp);
                    continue;
                }

                if ((jmh.Attribute & JAM_MSG_SENT) || !(jmh.Attribute & JAM_MSG_LOCAL)) {
                    JAM_DelSubPacket(jsp);
                    continue;                
                } else {
                    // export message        
                    for (z=0;z<jsp->NumFields;z++) {
                        if (jsp->Fields[z]->LoID == JAMSFLD_SUBJECT) {
                            if (jsp->Fields[z]->DatLen > 24) {
                                len = 24;
                            } else {
                                len = jsp->Fields[z]->DatLen;
                            }
                            memset(qh.MsgSubj, ' ', 25);
                            memcpy(qh.MsgSubj, jsp->Fields[z]->Buffer, len);
                        }
                        if (jsp->Fields[z]->LoID == JAMSFLD_SENDERNAME) {
                            if (jsp->Fields[z]->DatLen > 24) {
                                len = 24;
                            } else {
                                len = jsp->Fields[z]->DatLen;
                            }
                            memset(qh.MsgFrom, ' ', 25);              
                            memcpy(qh.MsgFrom, jsp->Fields[z]->Buffer, len);
                        }
                        if (jsp->Fields[z]->LoID == JAMSFLD_RECVRNAME) {
                            if (jsp->Fields[z]->DatLen > 24) {
                                len = 24;
                            } else {
                                len = jsp->Fields[z]->DatLen;
                            }            
                            memset(qh.MsgTo, ' ', 25);          
                            memcpy(qh.MsgTo, jsp->Fields[z]->Buffer, len);
                        }
                    }
                    qh.Msgstat = ' ';
                    snprintf(buffer, 7, "%d", baseno);
                    memset(qh.Msgnum, ' ', 7);
                    memcpy(qh.Msgnum, buffer, strlen(buffer));

                    localtime_r(&jmh.DateWritten, &msgtm);

                    snprintf(buffer, PATH_MAX, "%02d-%02d-%02d", msgtm.tm_mon + 1, msgtm.tm_mday, msgtm.tm_year - 100);
                    memcpy(qh.Msgdate, buffer, 8);

                    snprintf(buffer, PATH_MAX, "%02d:%02d", msgtm.tm_hour, msgtm.tm_min);
                    memcpy(qh.Msgtime, buffer, 5);

                    memset(qh.Msgpass, ' ', 12);
                    memset(qh.Msgrply, ' ', 8);

                    len = jmh.TxtLen / 128 + 2;
                    lenbytes = len * 128;
                    
                    msgbuf = (char *)malloc(lenbytes);

                    memset(msgbuf, ' ', lenbytes);

                    JAM_ReadMsgText(jb, jmh.TxtOffset, jmh.TxtLen, msgbuf);

                    msgptr = msgbuf;
                    while (*msgptr != '\0') {
                        if (*msgptr == '\r') {
                            *msgptr = '\xe3';
                        }
                        msgptr++;
                    }

                    for (z=0;z<lenbytes;z++) {
                        if (msgbuf[z] == '\0') {
                            msgbuf[z] = ' ';
                        }
                    }

                    snprintf(buffer, 7, "%d", len);
                    memset(qh.Msgrecs, ' ', 6);
                    memcpy(qh.Msgrecs, buffer, strlen(buffer));

                    qh.Msglive = 0xE1;
                    qh.Msgarealo = baseno & 0xff;
                    qh.Msgareahi = (baseno >> 8) & 0xff;

                    qh.Msgoffhi = ((qwkidx + msgcount + 1) >> 8) & 0xff;
                    qh.Msgofflo = (qwkidx + msgcount + 1) & 0xff;

                    qh.Msgtagp = '*';


                    snprintf(buffer, PATH_MAX, "%s/%s.MSG", temp_dir, hostid);
                    fptr = fopen(buffer, "r+");
                    if (!fptr) {
                        fptr = fopen(buffer, "w");
                        if (fptr) {
                            memset(text, ' ', 128);
                            memcpy(text, hostid, strlen(hostid));
                            fwrite(text, 128, 1, fptr);
                        } else {
                            fprintf(stderr, "UNABLE TO OPEN %s!!\n", buffer);
                            JAM_CloseMB(jb);
                            free(jb);
                            exit(-1);
                        }
                    } else {
                        fseek(fptr, 0, SEEK_END);
                    }

                    fwrite(&qh, 128, 1, fptr);
                    fwrite(msgbuf, lenbytes - 128, 1, fptr);
                    fclose(fptr);
                    jmh.Attribute |= JAM_MSG_SENT;
                    while (1) {
                        z = JAM_LockMB(jb, 100);
                        if (z == 0) {
                            break;
                        } else if (z == JAM_LOCK_FAILED) {
                            sleep(1);
                        } else {
                            JAM_DelSubPacket(jsp);
                            JAM_CloseMB(jb);
                            free(jb);
                            fprintf(stderr, "Error locking JAM base!\n");
                            exit(-1);
                        }
                    }
                    z =JAM_ChangeMsgHeader(jb, i, &jmh);
                    JAM_UnlockMB(jb);
                    JAM_DelSubPacket(jsp);
                    free(msgbuf);
                    msgcount++;
                }
            }
        }
        JAM_CloseMB(jb);
        free(jb);
    }

    return msgcount;
}

int main(int argc, char **argv) {
    int i;
    message_base_path = NULL;
    outbound_path = NULL;
    temp_dir = NULL;
    int qwkidx = 0;
    int msgcount = 0;
    char buffer[PATH_MAX];
    char archive[PATH_MAX];
    int ret;
    if (argc < 2) {
        fprintf(stderr, "Usage:\n    ./qwkscan config.ini\n");
        return -1;
    }

	config_file = argv[1];

	if (ini_parse(config_file, handler, NULL) <0) {
		fprintf(stderr, "Unable to load configuration ini (%s)!\n", config_file);
		exit(-1);
	}

    if (temp_dir == NULL || message_base_path == NULL || outbound_path == NULL) {
        fprintf(stderr, "Outbound Path & Temp dir must both be set\n");
        exit(-1);
    }

    mkdir(temp_dir, 0755);

    for (i=0;i<msgbasecount;i++) {
        msgcount = export_messages(msgbases[i]->baseno, msgbases[i]->path, qwkidx);
        qwkidx += msgcount;
        fprintf(stderr, "Exporting from base %d... %d exported\n", msgbases[i]->baseno, msgcount);
    }

    snprintf(archive, PATH_MAX, "%s/%s.REP", outbound_path, hostid);

	char *b = buffer;
	size_t blen = sizeof buffer;
	for (const char *p = pack_cmd; *p != '\0' && blen >= 1; ++p) {
		if (*p != '*') {
			*b++ = *p;
			--blen;
			continue;
		}
		p++;
		size_t alen = 0;
		if (*p == 'a') {
			strncpy(b, archive, blen);
			alen = strlen(archive);
		} else if (*p == 'f') {
			snprintf(b, blen, "%s/%s.MSG", temp_dir, hostid);
			alen = strlen(b);
		} else if (*p == '*') {
			*b++ = '*';
			alen = 1;
		}
		b += alen;
		blen -= alen;
	}
	*b = '\0';

    ret = system(buffer);
    if (ret == -1 || ret >> 8 == 127) {
        return -1;
    }
    recursive_delete(temp_dir);
}