/* -*- mode: C; c-basic-offset: 4 -*- */
#ident "Copyright (c) 2010 Tokutek Inc.  All rights reserved."
#ident "$Id$"

#include "test.h"
#include "toku_pthread.h"
#include <db.h>
#include <sys/stat.h>

DB_ENV *env;
enum {MAX_NAME=128};
enum {MAX_DBS=256};
int NUM_DBS=5;
int NUM_ROWS=100000;
int CHECK_RESULTS=0;
enum {MAGIC=311};

//
//   Functions to create unique key/value pairs, row generators, checkers, ... for each of NUM_DBS
//

//   a is the bit-wise permute table.  For DB[i], permute bits as described in a[i] using 'twiddle32'
// inv is the inverse bit-wise permute of a[].  To get the original value from a twiddled value, twiddle32 (again) with inv[]
int   a[MAX_DBS][32];
int inv[MAX_DBS][32];

#if defined(__cilkplusplus) || defined (__cplusplus)
extern "C" {
#endif

// rotate right and left functions
static inline unsigned int rotr32(const unsigned int x, const unsigned int num) {
    const unsigned int n = num % 32;
    return (x >> n) | ( x << (32 - n));
}
static inline unsigned int rotl32(const unsigned int x, const unsigned int num) {
    const unsigned int n = num % 32;
    return (x << n) | ( x >> (32 - n));
}

static void generate_permute_tables(void) {
    int i, j, tmp;
    for(int db=0;db<MAX_DBS;db++) {
        for(i=0;i<32;i++) {
            a[db][i] = i;
        }
        for(i=0;i<32;i++) {
            j = random() % (i + 1);
            tmp = a[db][j];
            a[db][j] = a[db][i];
            a[db][i] = tmp;
        }
//        if(db < NUM_DBS){ printf("a[%d] = ", db); for(i=0;i<32;i++) { printf("%2d ", a[db][i]); } printf("\n");}
        for(i=0;i<32;i++) {
            inv[db][a[db][i]] = i;
        }
    }
}

// permute bits of x based on permute table bitmap
static unsigned int twiddle32(unsigned int x, int db)
{
    unsigned int b = 0;
    for(int i=0;i<32;i++) {
        b |= (( x >> i ) & 1) << a[db][i];
    }
    return b;
}

// permute bits of x based on inverse permute table bitmap
static unsigned int inv_twiddle32(unsigned int x, int db)
{
    unsigned int b = 0;
    for(int i=0;i<32;i++) {
        b |= (( x >> i ) & 1) << inv[db][i];
    }
    return b;
}

// generate val from key, index
static unsigned int generate_val(int key, int i) {
    return rotl32((key + MAGIC), i);
}
static unsigned int pkey_for_val(int key, int i) {
    return rotr32(key, i) - MAGIC;
}

static int put_multiple_generate(DB *dest_db, DB *src_db, DBT *dest_key, DBT *dest_val, const DBT *src_key, const DBT *src_val, void *extra) {

    src_db = src_db;
    extra = extra;

    uint32_t which = *(uint32_t*)dest_db->app_private;

    if ( which == 0 ) {
        dbt_init(dest_key, src_key->data, src_key->size);
        dbt_init(dest_val, src_val->data, src_val->size);
    }
    else {
        unsigned int *new_key = (unsigned int *)toku_malloc(sizeof(unsigned int));
        unsigned int *new_val = (unsigned int *)toku_malloc(sizeof(unsigned int));

        *new_key = twiddle32(*(unsigned int*)src_key->data, which);
        *new_val = generate_val(*(unsigned int*)src_key->data, which);

        dbt_init(dest_key, new_key, sizeof(unsigned int));
        dbt_init(dest_val, new_val, sizeof(unsigned int));
    }

//    printf("dest_key.data = %d\n", *(int*)dest_key->data);
//    printf("dest_val.data = %d\n", *(int*)dest_val->data);

    return 0;
}

#if defined(__cilkplusplus) || defined(__cplusplus)
} // extern "C"
#endif

static void check_results(DB **dbs)
{
    for(int j=0;j<NUM_DBS;j++){
        DBT key, val;
        unsigned int k=0, v=0;
        dbt_init(&key, &k, sizeof(unsigned int));
        dbt_init(&val, &v, sizeof(unsigned int));
        int r;
        unsigned int pkey_for_db_key;

        DB_TXN *txn;
        r = env->txn_begin(env, NULL, &txn, 0);
        CKERR(r);

        DBC *cursor;
        r = dbs[j]->cursor(dbs[j], txn, &cursor, 0);
        CKERR(r);
        for(int i=0;i<NUM_ROWS;i++) {
            r = cursor->c_get(cursor, &key, &val, DB_NEXT);    
            CKERR(r);
            k = *(unsigned int*)key.data;
            pkey_for_db_key = (j == 0) ? k : inv_twiddle32(k, j);
            v = *(unsigned int*)val.data;
            // test that we have the expected keys and values
            assert((unsigned int)pkey_for_db_key == (unsigned int)pkey_for_val(v, j));
//            printf(" DB[%d] key = %10u, val = %10u, pkey_for_db_key = %10u, pkey_for_val=%10d\n", j, v, k, pkey_for_db_key, pkey_for_val(v, j));
        }
        {printf("."); fflush(stdout);}
        r = cursor->c_close(cursor);
        CKERR(r);
        r = txn->commit(txn, 0);
        CKERR(r);
    }
    printf("\nCheck OK\n");
}

static void test_loader(DB **dbs)
{
    int r;
    DB_TXN    *txn;
    DB_LOADER *loader;
    uint32_t flags[MAX_DBS];
    uint32_t dbt_flags[MAX_DBS];
    for(int i=0;i<MAX_DBS;i++) { 
        flags[i] = DB_NOOVERWRITE; 
        dbt_flags[i] = 0;
    }

    // create and initialize loader
    r = env->txn_begin(env, NULL, &txn, 0);                                                               
    CKERR(r);
    r = env->create_loader(env, txn, &loader, dbs[0], NUM_DBS, dbs, flags, dbt_flags, NULL);
    CKERR(r);
    r = loader->set_duplicate_callback(loader, NULL);
    CKERR(r);
    r = loader->set_poll_function(loader, NULL);
    CKERR(r);

    // using loader->put, put values into DB
    DBT key, val;
    unsigned int k, v;
    for(int i=1;i<=NUM_ROWS;i++) {
        k = i;
        v = generate_val(i, 0);
        dbt_init(&key, &k, sizeof(unsigned int));
        dbt_init(&val, &v, sizeof(unsigned int));
        r = loader->put(loader, &key, &val);
        CKERR(r);
        if ( CHECK_RESULTS) { if((i%10000) == 0){printf("."); fflush(stdout);} }
    }
    if( CHECK_RESULTS ) {printf("\n"); fflush(stdout);}        
        
    // close the loader
    r = loader->close(loader);
    CKERR(r);

    r = txn->commit(txn, 0);
    CKERR(r);

    // verify the DBs
    if ( CHECK_RESULTS ) {
        check_results(dbs);
    }
}


static void run_test(void) 
{
    int r;
    r = system("rm -rf " ENVDIR);                                                                             CKERR(r);
    r = toku_os_mkdir(ENVDIR, S_IRWXU+S_IRWXG+S_IRWXO);                                                       CKERR(r);

    r = db_env_create(&env, 0);                                                                               CKERR(r);
    r = env->set_default_bt_compare(env, uint_dbt_cmp);                                                       CKERR(r);
    r = env->set_default_dup_compare(env, uint_dbt_cmp);                                                      CKERR(r);
    r = env->set_generate_row_callback_for_put(env, put_multiple_generate);
    CKERR(r);
    int envflags = DB_INIT_LOCK | DB_INIT_MPOOL | DB_INIT_TXN | DB_CREATE | DB_PRIVATE;
    r = env->open(env, ENVDIR, envflags, S_IRWXU+S_IRWXG+S_IRWXO);                                            CKERR(r);
    env->set_errfile(env, stderr);
    //Disable auto-checkpointing
    r = env->checkpointing_set_period(env, 0);                                                                CKERR(r);

    DBT desc;
    dbt_init(&desc, "foo", sizeof("foo"));
    char name[MAX_NAME*2];

    DB **dbs = (DB**)toku_malloc(sizeof(DB*) * NUM_DBS);
    assert(dbs != NULL);
    int idx[MAX_DBS];
    for(int i=0;i<NUM_DBS;i++) {
        idx[i] = i;
        r = db_create(&dbs[i], env, 0);                                                                       CKERR(r);
        r = dbs[i]->set_descriptor(dbs[i], 1, &desc, abort_on_upgrade);                                       CKERR(r);
        dbs[i]->app_private = &idx[i];
        snprintf(name, sizeof(name), "db_%04x", i);
        r = dbs[i]->open(dbs[i], NULL, name, NULL, DB_BTREE, DB_CREATE, 0666);                                CKERR(r);
    }

    generate_permute_tables();

//    printf("running test_loader()\n");
    // -------------------------- //
    test_loader(dbs);
    // -------------------------- //
//    printf("done    test_loader()\n");

    for(int i=0;i<NUM_DBS;i++) {
        dbs[i]->close(dbs[i], 0);                                                                             CKERR(r);
        dbs[i] = NULL;
    }
    r = env->close(env, 0);                                                                                   CKERR(r);
    toku_free(dbs);
}

// ------------ infrastructure ----------
static void do_args(int argc, char *argv[]);

int test_main(int argc, char **argv) {
    do_args(argc, argv);
    run_test();
    return 0;
}

static void do_args(int argc, char *argv[]) {
    int resultcode;
    char *cmd = argv[0];
    argc--; argv++;
    while (argc>0) {
	if (strcmp(argv[0], "-h")==0) {
	    resultcode=0;
	do_usage:
	    fprintf(stderr, "Usage: -h -c -d <num_dbs> -r <num_rows>\n%s\n", cmd);
	    exit(resultcode);
        } else if (strcmp(argv[0], "-d")==0) {
            argc--; argv++;
            NUM_DBS = atoi(argv[0]);
            if ( NUM_DBS > MAX_DBS ) {
                fprintf(stderr, "max value for -d field is %d\n", MAX_DBS);
                resultcode=1;
                goto do_usage;
            }
        } else if (strcmp(argv[0], "-r")==0) {
            argc--; argv++;
            NUM_ROWS = atoi(argv[0]);
        } else if (strcmp(argv[0], "-c")==0) {
            CHECK_RESULTS = 1;
	} else {
	    fprintf(stderr, "Unknown arg: %s\n", argv[0]);
	    resultcode=1;
	    goto do_usage;
	}
	argc--;
	argv++;
    }
}
