#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <sys/stat.h>
#include <unistd.h>
#include <dirent.h>
#include "jamlib/jam.h"

char *baseindir = NULL;

struct msgarea_t {
    int id;
    char *basedir;
    int *links;
    int link_count;
};

struct msg_t {
    int area;
    char from[32];
    char to[32];
    char subject[64];
    uint32_t timedate;
    int oaddr;
    int daddr;
    char reply[36];
} __attribute__ ((packed));

struct msgarea_t **areas;
int area_count;

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;
}

size_t trimwhitespace(char *out, size_t len, const char *str) {
    if(len == 0)
        return 0;

    const char *end;
    size_t out_size;

    // Trim leading space
    while(isspace((unsigned char)*str)) str++;

    if(*str == 0) {
        *out = 0;
        return 1;
    }

    // Trim trailing space
    end = str + strlen(str) - 1;
    while(end > str && isspace((unsigned char)*end)) end--;
    end++;

    // Set output size to minimum of trimmed string length and buffer size minus 1
    out_size = (end - str) < len-1 ? (end - str) : len-1;

    // Copy trimmed string and add null terminator
    memcpy(out, str, out_size);
    out[out_size] = 0;

    return out_size;
}

int parse_config_file(char *filename) {
    FILE *fptr;
    char buffer[256];
    char bufferw[256];
    char *ptr;
    struct msgarea_t *newarea;

    area_count = 0;

    fptr = fopen(filename, "r");
    if (!fptr) {
        return 0;
    }

    fgets(buffer, 256, fptr);
    while (!feof(fptr)) {
        if (buffer[0] != ';') {
            if (buffer[strlen(buffer) - 1] == '\n'){
                buffer[strlen(buffer) - 1] = '\0';

                if (strncasecmp(buffer, "INDIR", 5) == 0) {
                    trimwhitespace(bufferw, 256, &buffer[6]);
                    baseindir = strdup(bufferw);
                } else if (strncasecmp(buffer, "MSGAREA", 7) == 0) {
                    newarea = NULL;
                    ptr = strtok(&buffer[8], ",");
                    
                    if (ptr != NULL) {
                        newarea = (struct msgarea_t *)malloc(sizeof(struct msgarea_t));
                        trimwhitespace(bufferw, 256, ptr);
                        newarea->id = atoi(bufferw);
                        newarea->link_count = 0;
                        ptr = strtok(NULL, ",");
                        if (ptr != NULL) {
                            trimwhitespace(bufferw, 256, ptr);
                            newarea->basedir = strdup(bufferw);
                            ptr = strtok(NULL, ",");
                            while (ptr != NULL) {
                                trimwhitespace(bufferw, 256, ptr);
                                if (newarea->link_count == 0) {
                                    newarea->links = (int *)malloc(sizeof(int));
                                } else {
                                    newarea->links = (int *)realloc(newarea->links, sizeof(int) * (newarea->link_count + 1));
                                }
                                newarea->links[newarea->link_count] = atoi(bufferw);
                                newarea->link_count++;
                                ptr = strtok(NULL, ",");
                            }
                        }
                    }
                    if (newarea != NULL) {
                        if (area_count == 0) {
                            areas = (struct msgarea_t **)malloc(sizeof(struct msgarea_t *));
                        } else {
                            areas = (struct msgarea_t **)realloc(areas, sizeof(struct msgarea_t *) * (area_count + 1));
                        }
                        areas[area_count] = newarea;
                        area_count++;
                    }
                }
            } else {
                fclose(fptr);
                return 0;
            }
        }
        fgets(buffer, 256, fptr);
    }

    fclose(fptr);
    return 1;
}

int isdupe(struct msg_t *msg, char *uuid) {
    s_JamBase *jb;
	s_JamBaseHeader jbh;
	s_JamMsgHeader jmh;
	s_JamSubPacket* jsp;

    int areaid;
    int i;
    int z;

    for (i=0;i<area_count;i++) {
        if (msg->area == areas[i]->id) {
            areaid = i;
            break;
        }
    }

    jb = open_jam_base(areas[areaid]->basedir);
	if (!jb) {
		return -1;
	}
	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;
            }
            for (z=0;z<jsp->NumFields;z++) {
                if (jsp->Fields[z]->LoID == JAMSFLD_MSGID) {
                    if (strncasecmp(uuid, jsp->Fields[z]->Buffer, 36) == 0) {
                        JAM_DelSubPacket(jsp);
                        JAM_CloseMB(jb);
                        free(jb);
                        return 1;
                    }
                }
            }
        }
    }
    JAM_CloseMB(jb);
	free(jb);

    return 0;               
}

int import(char *filename) {
    FILE *fptr;
    char buffer[PATH_MAX];
    char uuid[37];
    struct msg_t msg;
    int ret;
    int areaid;
    struct stat st;
    int z;
    int i;
    char *body;
    s_JamBase *jb;
	s_JamBaseHeader jbh;
	s_JamMsgHeader jmh;
	s_JamSubPacket* jsp;
	s_JamSubfield jsf;

    snprintf(buffer, PATH_MAX, "%s/%s", baseindir, filename);
    strncpy(uuid, filename, 36);
    
    uuid[36] = '\0';

    if (stat(buffer, &st) != 0) {
        return 0;
    }

    fptr = fopen(buffer, "rb");
    if (!fptr) {
        return 0;
    }

    fread(&msg, sizeof(struct msg_t), 1, fptr);

    ret = isdupe(&msg, uuid);
    if (ret == -1) {
        fclose(fptr);
        return 0;
    } else if (ret == 1) {
        fclose(fptr);
        return 1;
    }

    body = malloc(st.st_size - sizeof(struct msg_t) + 1);

    memset(body, 0, st.st_size - sizeof(struct msg_t) + 1);

    fread(body, st.st_size - sizeof(struct msg_t), 1, fptr);

    fclose(fptr);

    JAM_ClearMsgHeader(&jmh);
    jmh.DateWritten = msg.timedate;
    jmh.Attribute |= JAM_MSG_TYPEECHO;

    jsp = JAM_NewSubPacket();

    jsf.LoID = JAMSFLD_SENDERNAME;
    jsf.HiID = 0;
    jsf.DatLen = strlen(msg.from);
    jsf.Buffer = msg.from;
   	JAM_PutSubfield(jsp, &jsf); 

	jsf.LoID   = JAMSFLD_RECVRNAME;
	jsf.HiID   = 0;
	jsf.DatLen = strlen(msg.to);
	jsf.Buffer = msg.to;
	JAM_PutSubfield(jsp, &jsf);

	jsf.LoID   = JAMSFLD_SUBJECT;
	jsf.HiID   = 0;
	jsf.DatLen = strlen(msg.subject);
	jsf.Buffer = msg.subject;
	JAM_PutSubfield(jsp, &jsf);

    sprintf(buffer, "%d", msg.oaddr);
	jsf.LoID   = JAMSFLD_OADDRESS;
	jsf.HiID   = 0;
	jsf.DatLen = strlen(buffer);
	jsf.Buffer = buffer;
	JAM_PutSubfield(jsp, &jsf);    

	jsf.LoID   = JAMSFLD_MSGID;
	jsf.HiID   = 0;
	jsf.DatLen = strlen(uuid);
	jsf.Buffer = uuid;
	JAM_PutSubfield(jsp, &jsf);

    if (strlen(msg.reply)> 0) {
        jsf.LoID   = JAMSFLD_REPLYID;
        jsf.HiID   = 0;
        jsf.DatLen = strlen(msg.reply);
        jsf.Buffer = msg.reply;
        JAM_PutSubfield(jsp, &jsf);
        jmh.ReplyCRC = JAM_Crc32(msg.reply, strlen(msg.reply));
    }
    for (i=0;i<area_count;i++) {
        if (msg.area == areas[i]->id) {
            areaid = i;
            break;
        }
    }
    jb = open_jam_base(areas[areaid]->basedir);
	if (!jb) {
		return 0;
	}
    while (1) {
        z = JAM_LockMB(jb, 100);
        if (z == 0) {
            break;
        } else if (z == JAM_LOCK_FAILED) {
            sleep(1);
        } else {
            free(body);
            JAM_DelSubPacket(jsp);
            JAM_CloseMB(jb);
            free(jb);
            fprintf(stderr, "Error locking JAM base!\n");
            return 0;
        }
    }
    if (JAM_AddMessage(jb, &jmh, jsp, body, strlen(body))) {
	    JAM_UnlockMB(jb);
        JAM_DelSubPacket(jsp);
        JAM_CloseMB(jb);
        free(jb);
        fprintf(stderr, "Error Adding Message!\n");
        free(body);
        return 0;
	}
    JAM_UnlockMB(jb);
    JAM_DelSubPacket(jsp);
    JAM_CloseMB(jb);
    free(jb);

    free(body);

    return 1;
}

int main(int argc, char **argv) {
    int i;
    int l;
    int processed = 0;
    DIR *indir;
    struct dirent *dent;
    char buffer[PATH_MAX];

    if (argc < 2) {
        fprintf(stderr, "Usage ./mnettoss mnet.cfg\n");
        return -1;
    }

    if (!parse_config_file(argv[1])) {
        fprintf(stderr, "Error parsing config file: %s\n", argv[1]);
        return -1;
    }

    if (baseindir == NULL) {
        fprintf(stderr, "INDIR must be defined\n");
        return -1;        
    }

    printf("In Base Dir: %s\n", baseindir);

    indir = opendir(baseindir);
    if (!indir) {
        fprintf(stderr, "Error opening inbound directory!\n");
        return -1;
    }

    while ((dent = readdir(indir)) != NULL) {
        if (strlen(dent->d_name) < 8) {
            continue;
        }

        if (strcasecmp(&dent->d_name[strlen(dent->d_name) - 8], ".message") == 0) {
            if (import(dent->d_name)) {
                processed++;
                snprintf(buffer, PATH_MAX, "%s/%s", baseindir, dent->d_name);
                unlink(buffer);
                rewinddir(indir);
            }
        }
    }
    closedir(indir);

    printf("Processed %d Messages\n", processed);
    return 0;
}