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

#define kv_pair_funcs 1 // pull in kv_pair generators from test.h

#include "test.h"
#include "toku_pthread.h"
#include "toku_atomic.h"
#include <db.h>
#include <sys/stat.h>
#include "ydb-internal.h"

#include "test_kv_gen.h"

/*
 */

DB_ENV *env;
enum {MAX_NAME=128};
int NUM_DBS=1;
int NUM_ROWS=100000;
int SRC_VERSION = 4;

#define MAXDEPTH 64
#define OLDDATADIR "../../../../tokudb.data/"

char *env_dir = ENVDIR; // the default env_dir.
char *db_v5_dir = "dir.preload-db-nested.c.tdb";
char *db_v4_dir        = OLDDATADIR "env_preload.4.2.0.nested.cleanshutdown";


static void
check_results_nested(DB ** dbs, const uint num_rows) {
    int num_dbs = 1;  // maybe someday increase
    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;

        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(uint i=0;i<num_rows;i++) {
            if (i % MAXDEPTH) {
		r = cursor->c_get(cursor, &key, &val, DB_NEXT);    
		CKERR(r);
		uint observed_k = *(unsigned int*)key.data;
		uint observed_v = *(unsigned int*)val.data;
		uint expected_k = i;
		uint generated_value = generate_val(i, 0);
		uint expected_v = generated_value + (i%MAXDEPTH - 1);
		if (verbose >= 3)
		    printf("expected key %d, observed key %d, expected val %d, observed val %d\n", 
			   expected_k, observed_k, expected_v, observed_v);
		// test that we have the expected keys and values
		assert(observed_k == expected_k);
		assert(observed_v == expected_v);
	    }
            dbt_init(&key, NULL, sizeof(unsigned int));
            dbt_init(&val, NULL, sizeof(unsigned int));
	    if ( verbose && (i%10000 == 0)) {printf("."); fflush(stdout);}
        }
        r = cursor->c_close(cursor);
        CKERR(r);
        r = txn->commit(txn, 0);
        CKERR(r);
    }
    if ( verbose ) {printf("ok");fflush(stdout);}
}


static void upgrade_test_1(DB **dbs) {
    int r;
    // open the DBS
    {
        DBT desc;
        dbt_init(&desc, "foo", sizeof("foo"));
        char name[MAX_NAME*2];

        int idx[MAX_DBS];
        for(int i=0;i<NUM_DBS;i++) {
            idx[i] = i;
            r = db_create(&dbs[i], env, 0);                                                                       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);
            IN_TXN_COMMIT(env, NULL, txn_desc, 0, {
                CHK(dbs[i]->change_descriptor(dbs[i], txn_desc, &desc, 0));
            });
        }
    }

    // read and verify all rows
    {
        if ( verbose ) {printf("checking");fflush(stdout);}
        check_results_nested(&dbs[0], NUM_ROWS);
        if ( verbose) {printf("\ndone\n");fflush(stdout);}
    }
    // close
    {
        for(int i=0;i<NUM_DBS;i++) {
            dbs[i]->close(dbs[i], 0);                                                                             CKERR(r);
            dbs[i] = NULL;
        }
    }
}

static void setup(void) {
    int r;
    int len = 256;
    char syscmd[len];
    char * src_db_dir;

    if ( SRC_VERSION == 4 ) {
	src_db_dir = db_v4_dir;
    }
    else if ( SRC_VERSION == 5 ) {
        src_db_dir = db_v5_dir;
    }
    else {
        fprintf(stderr, "unsupported TokuDB version %d to upgrade\n", SRC_VERSION);
        assert(0);
    }

    r = snprintf(syscmd, len, "rm -rf %s", env_dir);
    assert(r<len);
    r = system(syscmd);                                                                                  
    CKERR(r);
    
    r = snprintf(syscmd, len, "cp -r %s %s", src_db_dir, env_dir);
    assert(r<len);
    r = system(syscmd);                                                                                 
    CKERR(r);
    generate_permute_tables();

}

static void run_test(void) 
{
    int r;
    r = db_env_create(&env, 0);                                                                               CKERR(r);
    r = env->set_default_bt_compare(env, uint_dbt_cmp);                                                       CKERR(r);
    r = env->set_cachesize(env, 0, 512*1024, 1);                                                              CKERR(r); 
    r = env->set_redzone(env, 0);                                                                             CKERR(r);
    int envflags = DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_MPOOL | DB_INIT_TXN | DB_CREATE | DB_PRIVATE;
    r = env->open(env, env_dir, envflags, S_IRWXU+S_IRWXG+S_IRWXO);                                           CKERR(r);
    env->set_errfile(env, stderr);
    r = env->checkpointing_set_period(env, 1);                                                                CKERR(r);

    DB **dbs = (DB**)toku_malloc(sizeof(DB*) * NUM_DBS);
    assert(dbs != NULL);

    // --------------------------
    upgrade_test_1(dbs);
    // --------------------------

    if (verbose >= 2)
	print_engine_status(env);
    r = env->close(env, 0);                                                                                   CKERR(r);
    toku_free(dbs);

}

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

int test_main(int argc, char * const *argv) {
    do_args(argc, argv);
    setup();
    run_test();  // read, upgrade, write back to disk
    run_test();  // read and verify
    return 0;
}

static void do_args(int argc, char * const argv[]) {
    int resultcode;
    char *cmd = argv[0];
    argc--; argv++;
    
    while (argc>0) {
	if (strcmp(argv[0], "-v")==0) {
	    verbose++;
	} else if (strcmp(argv[0],"-q")==0) {
	    verbose--;
	    if (verbose<0) verbose=0;
        } else if (strcmp(argv[0], "-h")==0) {
	    resultcode=0;
	do_usage:
	    fprintf(stderr, "Usage: -h -r <num_rows> %s\n", cmd);
	    exit(resultcode);
        } else if (strcmp(argv[0], "-r")==0) {
            argc--; argv++;
            NUM_ROWS = atoi(argv[0]);
        } else if (strcmp(argv[0], "-V")==0) {
            argc--; argv++;
            SRC_VERSION = atoi(argv[0]);
	} else {
	    fprintf(stderr, "Unknown arg: %s\n", argv[0]);
	    resultcode=1;
	    goto do_usage;
	}
	argc--;
	argv++;
    }
}
