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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2013 Olaf Wintermann. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *   1. Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *
 *   2. Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
 *      documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <libxml/xmlerror.h>
#include <sys/types.h>
#include <ucx/string.h>
#include <dirent.h>

#include <libidav/webdav.h>
#include <libidav/utils.h>

#include "config.h"
#include "scfg.h"
#include "sopt.h"
#include "db.h"

#include "sync.h"

static DavContext *ctx;

static void xmlerrorfnc(void * c, const char * msg, ... ) {
    // nothing
}

int main(int argc, char **argv) {
    if(argc < 2) {
        fprintf(stderr, "Missing command\n");
        print_usage(argv[0]);
        return -1;
    }
    
    char *cmd = argv[1];
    CmdArgs *args = cmd_parse_args(argc - 2, argv + 2);
    if(!args) {
        print_usage(argv[0]);
        return -1;
    }
    
    xmlGenericErrorFunc fnc = xmlerrorfnc;
    initGenericErrorDefaultFunc(&fnc);
    ctx = dav_context_new();
    load_config(ctx);
    if(load_sync_config()) {
        return EXIT_FAILURE;
    }
    
    int ret = EXIT_FAILURE;
    if(!strcmp(cmd, "pull")) {
        ret = cmd_pull(args);
    } else if(!strcmp(cmd, "push")) {
        ret = cmd_pull(args);
    } else if(!strcmp(cmd, "sync")) {
        ret = cmd_sync(args);
    }
    
    return ret;
}

void print_usage(char *cmd) {
    
}

int cmd_pull(CmdArgs *a) {
    if(a->argc != 1) {
        fprintf(stderr, "Too %s arguments\n", a->argc < 1 ? "few" : "many");
        return -1;
    }
    
    SyncDirectory *dir = scfg_get_dir(a->argv[0]);
    if(!dir) {
        fprintf(stderr, "Unknown sync dir: %s\n", a->argv[0]);
        return -1;
    }
    
    Repository *repo = get_repository(sstr(dir->repository));
    if(!repo) {
        fprintf(stderr, "Unkown repository %s\n", dir->name);
        return -1;
    }
    
    UcxMap *db = load_db(dir->database);
    if(!db) {
        fprintf(stderr, "Cannot load database file: %s\n", dir->database);
        return -1;
    }
    
    DavSession *sn = dav_session_new_auth(
            ctx,
            repo->url,
            repo->user,
            repo->password);
    dav_session_set_flags(sn, get_repository_flags(repo));
    sn->key = dav_context_get_key(ctx, repo->default_key);
    
    DavResource *ls = dav_query(sn, "get D:getetag from / where lastmodified > 0 with depth -1");
    if(!ls) {
        fprintf(stderr, "Error\n");
        // TODO: free
        return -1;
    }
    
    if(!ls->children) {
        // TODO: free
        return 0; // empty repository
    }
    
    UcxList *stack = ucx_list_prepend(NULL, ls->children);
    while(stack) {
        DavResource *res = stack->data;
        stack = ucx_list_remove(stack, stack);
        
        while(res) {
            if(sync_get_resource(dir, res, db)) {
                fprintf(stderr, "sync_get_resource failed for resource: %s\n", res->path);
            }
            
            if(res->children) {
                stack = ucx_list_prepend(stack, res->children);
            }
            res = res->next;
        }
    }
    
    // store db
    
    
    return 0;
}

int sync_get_resource(SyncDirectory *dir, DavResource *res, UcxMap *db) {
    LocalResource *local = ucx_map_cstr_get(db, res->path);
    char *etag = dav_get_property(res, "D:getetag");
    if(local) {
        if(local->etag && !strcmp(etag, local->etag)) {
            // resource is already up-to-date on the client
            return 0;
        }
    }
    
    char *local_path = util_concat_path(dir->path, res->path);
    int ret = 0;
    if(res->iscollection) {
        mode_t mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;
        printf("mkdir %s\n", local_path);
        if(util_mkdir(local_path, mode) && errno != EEXIST) {
            ret = -1;
        }
    } else {
        FILE *out = fopen(local_path, "w");
        if(!out) {
            fprintf(stderr, "cannot open output file: %s\n", local_path);
            free(local_path);
            return -1;
        }
        printf("get %s\n", res->path);
        if(dav_get_content(res, out, (dav_write_func)fwrite)) {
            ret = -1;
        } else {
            if(local) {
                if(local->etag) {
                    free(local->etag);
                }
                local->etag = etag;
            }
        }
        fclose(out);
    }
    
    free(local_path);
    return ret;
}

int cmd_push(CmdArgs *a) {
    return 0;
}

int cmd_sync(CmdArgs *a) {
    return 0;
}