#include <string>
#include <vector>
#include <iostream>
#include <sstream>
#include "logstore.h"
#include "datapage.cpp"
#include "logiterators.cpp"
#include "merger.h"
#include <assert.h>
#include <limits.h>
#include <math.h>
#include <pthread.h>
#include <sys/time.h>
#include <time.h>

#undef begin
#undef end




bool mycmp(const std::string & k1,const std::string & k2)
{            
    //for char* ending with \0
    return strcmp(k1.c_str(),k2.c_str()) < 0;
    
    //for int32_t
    //printf("%d\t%d\n",(*((int32_t*)k1)) ,(*((int32_t*)k2)));
    //return (*((int32_t*)k1)) <= (*((int32_t*)k2));
}

//must be given a sorted array
void removeduplicates(std::vector<std::string> *arr)
{

    for(int i=arr->size()-1; i>0; i--)
    {
        if(! (mycmp((*arr)[i], (*arr)[i-1]) || mycmp((*arr)[i-1], (*arr)[i])))        
            arr->erase(arr->begin()+i);
            
    }

}

void getnextdata(std::string &data, int avg_len)
{
    int str_len = (rand()%(avg_len*2)) + 3;

    data = std::string(str_len, rand()%10+48);
    /*
    char *rc = (char*)malloc(str_len);
    
    for(int i=0; i<str_len-1; i++)        
        rc[i] = rand()%10+48;
        
    rc[str_len-1]='\0';
    data = std::string(rc);
    
    free(rc);
    */

}

void preprandstr(int count, std::vector<std::string> *arr, int avg_len=50)
{

    for ( int j=0; j<count; j++)
    {
        int str_len = (rand()%(avg_len*2)) + 3;

        char *rc = (char*)malloc(str_len);
        
        for(int i=0; i<str_len-1; i++)        
            rc[i] = rand()%10+48;
        
        rc[str_len-1]='\0';
        std::string str(rc);
        
        free(rc);

        arr->push_back(str);
        
    }

}

void insertProbeIter(int  NUM_ENTRIES)
{
    srand(1000);
    //unlink("storefile.txt");
    //unlink("logfile.txt");

    sync();
    double delete_freq = .05;
    double update_freq = .15;
    
    //data generation
    typedef std::vector<std::string> key_v_t;
    const static int max_partition_size = 100000;
    int KEY_LEN = 100;
    std::vector<key_v_t*> *key_v_list = new std::vector<key_v_t*>;
    int list_size = NUM_ENTRIES / max_partition_size + 1;
    for(int i =0; i<list_size; i++)
    {
        key_v_t * key_arr = new key_v_t;
        if(NUM_ENTRIES < max_partition_size*(i+1))
            preprandstr(NUM_ENTRIES-max_partition_size*i, key_arr, KEY_LEN);
        else
            preprandstr(max_partition_size, key_arr, KEY_LEN);
    
        std::sort(key_arr->begin(), key_arr->end(), &mycmp);
        key_v_list->push_back(key_arr);
        printf("size partition %d is %d\n", i+1, key_arr->size());
    }


    
    key_v_t * key_arr = new key_v_t;
    
    std::vector<key_v_t::iterator*> iters;
    for(int i=0; i<list_size; i++)
    {
        iters.push_back(new key_v_t::iterator((*key_v_list)[i]->begin()));
    }

    int lc = 0;
    while(true)
    {
        int list_index = -1;
        for(int i=0; i<list_size; i++)
        {
            if(*iters[i] == (*key_v_list)[i]->end())
                continue;
            
            if(list_index == -1 || mycmp(**iters[i], **iters[list_index]))
                list_index = i;
        }

        if(list_index == -1)
            break;
        
        if(key_arr->size() == 0 || mycmp(key_arr->back(), **iters[list_index]))
            key_arr->push_back(**iters[list_index]);

        (*iters[list_index])++;        
        lc++;
        if(lc % max_partition_size == 0)
            printf("%d/%d completed.\n", lc, NUM_ENTRIES);
    }

    for(int i=0; i<list_size; i++)
    {
        (*key_v_list)[i]->clear();
        delete (*key_v_list)[i];
        delete iters[i];
    }
    key_v_list->clear();
    delete key_v_list;
    
//    preprandstr(NUM_ENTRIES, data_arr, 10*8192);

    printf("key arr size: %d\n", key_arr->size());

    //removeduplicates(key_arr);
    if(key_arr->size() > NUM_ENTRIES)
        key_arr->erase(key_arr->begin()+NUM_ENTRIES, key_arr->end());
    
    NUM_ENTRIES=key_arr->size();
    
    bufferManagerNonBlockingSlowHandleType = IO_HANDLE_PFILE;

    Tinit();

    int xid = Tbegin();

    merge_scheduler mscheduler;    
    logtable ltable;

    int pcount = 40;
    ltable.set_fixed_page_count(pcount);

    recordid table_root = ltable.allocTable(xid);

    Tcommit(xid);
    
    xid = Tbegin();

    int lindex = mscheduler.addlogtable(&ltable);
    ltable.setMergeData(mscheduler.getMergeData(lindex));
    
    mscheduler.startlogtable(lindex);

    printf("Stage 1: Writing %d keys\n", NUM_ENTRIES);
    
    struct timeval start_tv, stop_tv, ti_st, ti_end;
    double insert_time = 0;
    int dpages = 0;
    int npages = 0;
    int delcount = 0, upcount = 0;
    DataPage<datatuple> *dp=0;
    int64_t datasize = 0;
    std::vector<pageid_t> dsp;
    std::vector<int> del_list;
    gettimeofday(&start_tv,0);
    for(int i = 0; i < NUM_ENTRIES; i++)
    {
        //prepare the key
        datatuple newtuple;        
        uint32_t keylen = (*key_arr)[i].length()+1;
        newtuple.keylen = &keylen;
        
        newtuple.key = (datatuple::key_t) malloc(keylen);
        memcpy((byte*)newtuple.key, (*key_arr)[i].c_str(), keylen);
        //for(int j=0; j<keylen-1; j++)
        //    newtuple.key[j] = (*key_arr)[i][j];
        //newtuple.key[keylen-1]='\0';

        //prepare the data
        std::string ditem;
        getnextdata(ditem, 8192);
        uint32_t datalen = ditem.length()+1;
        newtuple.datalen = &datalen;        
        newtuple.data = (datatuple::data_t) malloc(datalen);
        memcpy((byte*)newtuple.data, ditem.c_str(), datalen);
//        for(int j=0; j<datalen-1; j++)
//            newtuple.data[j] = (*data_arr)[i][j];
//        newtuple.data[datalen-1]='\0';        
        
        /*
        printf("key: \t, keylen: %u\ndata:  datalen: %u\n",
               //newtuple.key,
               *newtuple.keylen,
               //newtuple.data,
               *newtuple.datalen);
               */
        
        datasize += newtuple.byte_length();

        gettimeofday(&ti_st,0);        
        ltable.insertTuple(newtuple);
        gettimeofday(&ti_end,0);
        insert_time += tv_to_double(ti_end) - tv_to_double(ti_st);

        free(newtuple.key);
        free(newtuple.data);

        double rval = ((rand() % 100)+.0)/100;        
        if( rval < delete_freq) //delete a key 
        {
            int del_index = i - (rand()%50); //delete one of the last inserted 50 elements
            if(del_index >= 0 && std::find(del_list.begin(), del_list.end(), del_index) == del_list.end())
            {
                delcount++;
                datatuple deltuple;        
                keylen = (*key_arr)[del_index].length()+1;
                deltuple.keylen = &keylen;
        
                deltuple.key = (datatuple::key_t) malloc(keylen);
                memcpy((byte*)deltuple.key, (*key_arr)[del_index].c_str(), keylen);

                deltuple.datalen = &datalen;        
                deltuple.setDelete();

                gettimeofday(&ti_st,0);        
                ltable.insertTuple(deltuple);
                gettimeofday(&ti_end,0);
                insert_time += tv_to_double(ti_end) - tv_to_double(ti_st);

                free(deltuple.key);

                del_list.push_back(del_index);
                
            }            
        }
        else if(rval < delete_freq + update_freq) //update a record
        {
            int up_index = i - (rand()%50); //update one of the last inserted 50 elements
            if(up_index >= 0 && std::find(del_list.begin(), del_list.end(), up_index) == del_list.end()) 
            {//only update non-deleted elements
                upcount++;
                datatuple uptuple;        
                keylen = (*key_arr)[up_index].length()+1;
                uptuple.keylen = &keylen;
        
                uptuple.key = (datatuple::key_t) malloc(keylen);
                memcpy((byte*)uptuple.key, (*key_arr)[up_index].c_str(), keylen);
                
                getnextdata(ditem, 512);
                datalen = ditem.length()+1;
                uptuple.datalen = &datalen;        
                uptuple.data = (datatuple::data_t) malloc(datalen);
                memcpy((byte*)uptuple.data, ditem.c_str(), datalen);
                
                gettimeofday(&ti_st,0);        
                ltable.insertTuple(uptuple);
                gettimeofday(&ti_end,0);
                insert_time += tv_to_double(ti_end) - tv_to_double(ti_st);

                free(uptuple.key);
                free(uptuple.data);
                
            }            

        }
        
    }
    gettimeofday(&stop_tv,0);
    printf("insert time: %6.1f\n", insert_time);
    printf("insert time: %6.1f\n", (tv_to_double(stop_tv) - tv_to_double(start_tv)));
    printf("#deletions: %d\n#updates: %d\n", delcount, upcount);

    printf("\nTREE STRUCTURE\n");
    //ltable.get_tree_c1()->print_tree(xid);
    printf("datasize: %lld\n", datasize);
    //sleep(20);

    Tcommit(xid);
    xid = Tbegin();



    printf("Stage 2: Looking up %d keys:\n", NUM_ENTRIES);

    int found_tuples=0;
    for(int i=NUM_ENTRIES-1; i>=0; i--)
    {        
        int ri = i;
        //printf("key index%d\n", i);
        fflush(stdout);

        //get the key
        uint32_t keylen = (*key_arr)[ri].length()+1;        
        datatuple::key_t rkey = (datatuple::key_t) malloc(keylen);
        memcpy((byte*)rkey, (*key_arr)[ri].c_str(), keylen);
        //for(int j=0; j<keylen-1; j++)
        //rkey[j] = (*key_arr)[ri][j];
        //rkey[keylen-1]='\0';

        //find the key with the given tuple
        datatuple *dt = ltable.findTuple(xid, rkey, keylen);

        if(std::find(del_list.begin(), del_list.end(), i) == del_list.end())
        {
            assert(dt!=0);
            assert(!dt->isDelete());
            found_tuples++;
            assert(*(dt->keylen) == (*key_arr)[ri].length()+1);
            //assert(*(dt->datalen) == (*data_arr)[ri].length()+1);
            free(dt->keylen);
            free(dt);
        }
        else
        {
            if(dt!=0)
            {
                assert(*(dt->keylen) == (*key_arr)[ri].length()+1);
                assert(dt->isDelete());
                free(dt->keylen);
                free(dt);
            }
        }
        dt = 0;
        free(rkey);
    }
    printf("found %d\n", found_tuples);




    
    key_arr->clear();
    //data_arr->clear();
    delete key_arr;
    //delete data_arr;
    
    mscheduler.shutdown();
    printf("merge threads finished.\n");
    gettimeofday(&stop_tv,0);
    printf("run time: %6.1f\n", (tv_to_double(stop_tv) - tv_to_double(start_tv)));


    
    Tcommit(xid);
    Tdeinit();
    
    
}



/** @test
 */
int main()
{
    //insertProbeIter(25000);
    insertProbeIter(400000);
    /*
    insertProbeIter(5000);
    insertProbeIter(2500);
    insertProbeIter(1000);
    insertProbeIter(500);
    insertProbeIter(1000);
    insertProbeIter(100);
    insertProbeIter(10);
    */
    
    return 0;
}