/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*- */
// vim: ft=cpp:expandtab:ts=8:sw=4:softtabstop=4:
#ident "$Id$"
/*======
This file is part of PerconaFT.


Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved.

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License, version 2,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.

----------------------------------------

    PerconaFT is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License, version 3,
    as published by the Free Software Foundation.

    PerconaFT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with PerconaFT.  If not, see <http://www.gnu.org/licenses/>.
======= */

#ident "Copyright (c) 2006, 2015, Percona and/or its affiliates. All rights reserved."

#include "test.h"

#include <util/dmt.h>

static void
parse_args (int argc, const char *argv[]) {
    const char *argv0=argv[0];
    while (argc>1) {
        int resultcode=0;
        if (strcmp(argv[1], "-v")==0) {
            verbose++;
        } else if (strcmp(argv[1], "-q")==0) {
            verbose = 0;
        } else if (strcmp(argv[1], "-h")==0) {
        do_usage:
            fprintf(stderr, "Usage:\n%s [-v|-h]\n", argv0);
            exit(resultcode);
        } else {
            resultcode=1;
            goto do_usage;
        }
        argc--;
        argv++;
    }
}
/* End ".h like" stuff. */

struct value {
    uint32_t number;
};
#define V(x) ((struct value *)(x))



const uint32_t MAXNUM = 1024;
const uint32_t MAXLEN = 32;
char data[MAXNUM][MAXLEN];

struct val_type {
    char c[MAXLEN];
};

namespace toku {
class vwriter {
    public:
        size_t get_size(void) const {
            size_t len = strlen(v.c);
            invariant(len < sizeof(val_type));
            return len + 1;
        }
        void write_to(val_type *const dest) const {
            strcpy(dest->c, v.c);
        }

        vwriter(const char* c) {
            invariant(strlen(c) < sizeof(val_type));
            strcpy(v.c, c);
        }

        vwriter(const uint32_t klpair_len, val_type *const src) {
            invariant(strlen(src->c) < sizeof(val_type));
            strcpy(v.c, src->c);
            invariant(klpair_len == get_size());
        }
    private:
        val_type v;
};
}

/* Globals */
typedef toku::dmt<val_type, val_type*, toku::vwriter> vdmt;

const unsigned int random_seed = 0xFEADACBA;

///////////////


static void fail_one_verify(uint32_t len, uint32_t num, vdmt *v) {
    val_type* fetched_data;
    int count = 0;
    v->verify();
    for (uint32_t i = 0; i < num; i++) {
        uint32_t fetched_len;
        int r = v->fetch(i-count, &fetched_len, &fetched_data);
        if (r != 0 || fetched_len != len || strcmp(fetched_data->c, data[i])) {
            count++;
            continue;
        }
    }
    invariant(count == 1);
}

static void verify(uint32_t len, uint32_t num, vdmt *v) {
    v->verify();
    val_type* fetched_data;
    for (uint32_t i = 0; i < num; i++) {
        uint32_t fetched_len;
        int r = v->fetch(i, &fetched_len, &fetched_data);
        CKERR(r);
        invariant(fetched_len == len);
        invariant(!strcmp(fetched_data->c, data[i]));
    }
}


static void test_builder_fixed(uint32_t len, uint32_t num) {
    srandom(random_seed);
    assert(len > 1);
    assert(len <= MAXLEN);
    assert(num <= MAXNUM);
    for (uint32_t i = 0; i < num; i++) {
        for (uint32_t j = 0; j < len-1; j++) {
            data[i][j] = random() % 255 + 1; //This way it doesn't end up being 0 and thought of as NUL
        }
        data[i][len-1] = '\0'; //cap it
    }

    vdmt::builder builder;
    builder.create(num, num * len);

    for (uint32_t i = 0; i < num; i++) {
        vwriter vfun(data[i]);
        builder.append(vfun);
    }
    invariant(builder.value_length_is_fixed());
    vdmt v;
    builder.build(&v);
    invariant(v.value_length_is_fixed());
    invariant(v.get_fixed_length() == len || num == 0);

    invariant(v.size() == num);

    verify(len, num, &v);

    for (uint32_t change = 0; change < num; change++) {
        vdmt v2;
        v2.clone(v);
        v2.delete_at(change);
        fail_one_verify(len, num, &v2);

        vwriter vfun(data[change]);
        v2.insert_at(vfun, change);
        verify(len, num, &v2);
        v2.destroy();
    }

    v.destroy();
}

static void test_builder_variable(uint32_t len, uint32_t len2, uint32_t num) {
    srandom(random_seed);
    assert(len > 1);
    assert(len <= MAXLEN);
    assert(num <= MAXNUM);
    assert(num > 3);
    uint32_t which2 = random() % num;
    for (uint32_t i = 0; i < num; i++) {
        uint32_t thislen = i == which2 ? len2 : len;
        for (uint32_t j = 0; j < thislen-1; j++) {
            data[i][j] = random() % 255 + 1; //This way it doesn't end up being 0 and thought of as NUL
        }
        data[i][thislen-1] = '\0'; //cap it
    }

    vdmt::builder builder;
    builder.create(num, (num-1) * len + len2);

    for (uint32_t i = 0; i < num; i++) {
        vwriter vfun(data[i]);
        builder.append(vfun);
    }
    invariant(!builder.value_length_is_fixed());
    vdmt v;
    builder.build(&v);
    invariant(!v.value_length_is_fixed());

    invariant(v.size() == num);

    val_type* fetched_data;
    for (uint32_t i = 0; i < num; i++) {
        uint32_t fetched_len;
        int r = v.fetch(i, &fetched_len, &fetched_data);
        CKERR(r);
        if (i == which2) {
            invariant(fetched_len == len2);
            invariant(!strcmp(fetched_data->c, data[i]));
        } else {
            invariant(fetched_len == len);
            invariant(!strcmp(fetched_data->c, data[i]));
        }
    }

    v.destroy();
}

static void test_create_from_sorted_memory_of_fixed_sized_elements_and_serialize(uint32_t len, uint32_t num) {
    srandom(random_seed);
    assert(len <= MAXLEN);
    assert(num <= MAXNUM);
    for (uint32_t i = 0; i < num; i++) {
        for (uint32_t j = 0; j < len-1; j++) {
            data[i][j] = random() % 255 + 1; //This way it doesn't end up being 0 and thought of as NUL
        }
        data[i][len-1] = '\0'; //cap it
    }

    char *flat = (char*)toku_xmalloc(len * num);
    char *p = flat;
    for (uint32_t i = 0; i < num; i++) {
        memcpy(p, data[i], len);
        p += len;
    }
    vdmt v;

    v.create_from_sorted_memory_of_fixed_size_elements(flat, num, len*num, len);
    invariant(v.value_length_is_fixed());
    invariant(v.get_fixed_length() == len);

    invariant(v.size() == num);

    val_type* fetched_data;
    for (uint32_t i = 0; i < num; i++) {
        uint32_t fetched_len;
        int r = v.fetch(i, &fetched_len, &fetched_data);
        CKERR(r);
        invariant(fetched_len == len);
        invariant(!strcmp(fetched_data->c, data[i]));
    }

    char *serialized_flat = (char*)toku_xmalloc(len*num);
    struct wbuf wb;
    wbuf_nocrc_init(&wb, serialized_flat, len*num);
    v.prepare_for_serialize();
    v.serialize_values(len*num, &wb);
    invariant(!memcmp(serialized_flat, flat, len*num));

    
    if (num > 1) {
        //Currently converting to dtree treats the entire thing as NOT fixed length.
        //Optional additional perf here.
        uint32_t which = (random() % (num-1)) + 1;  // Not last, not first
        invariant(which > 0 && which < num-1);
        v.delete_at(which);

        memmove(flat + which*len, flat+(which+1)*len, (num-which-1) * len);
        v.prepare_for_serialize();
        wbuf_nocrc_init(&wb, serialized_flat, len*(num-1));
        v.serialize_values(len*(num-1), &wb);
        invariant(!memcmp(serialized_flat, flat, len*(num-1)));
    }

    toku_free(flat);
    toku_free(serialized_flat);

    v.destroy();
}

int
test_main(int argc, const char *argv[]) {
    parse_args(argc, argv);
    // Do test with size divisible by 4 and not
    test_builder_fixed(4, 0);
    test_builder_fixed(5, 0);
    test_builder_fixed(4, 1);
    test_builder_fixed(5, 1);
    test_builder_fixed(4, 100);
    test_builder_fixed(5, 100);
    // Do test with zero, one, or both sizes divisible
    test_builder_variable(4, 8, 100);
    test_builder_variable(4, 5, 100);
    test_builder_variable(5, 8, 100);
    test_builder_variable(5, 10, 100);

    test_create_from_sorted_memory_of_fixed_sized_elements_and_serialize(4, 0);
    test_create_from_sorted_memory_of_fixed_sized_elements_and_serialize(5, 0);
    test_create_from_sorted_memory_of_fixed_sized_elements_and_serialize(4, 1);
    test_create_from_sorted_memory_of_fixed_sized_elements_and_serialize(5, 1);
    test_create_from_sorted_memory_of_fixed_sized_elements_and_serialize(4, 100);
    test_create_from_sorted_memory_of_fixed_sized_elements_and_serialize(5, 100);

    return 0;
}