/*
 * sqlite_setup.c -- database creation + bulk population.
 *
 * This binary performs EVERY phase that must be excluded from the traces:
 *   - allocating the database file
 *   - CREATE TABLE / CREATE INDEX (schema initialization)
 *   - the bulk INSERT that populates the dataset
 *   - ANALYZE
 *
 * It is run once, untraced. The traced binary (sqlite_query) only ever opens
 * the resulting file read-only, so no DDL or INSERT code path is reachable
 * from the traced process at all.
 */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include "sqlite3.h"

static uint64_t rng;
static uint64_t next_rand(void) {
    rng = rng * 6364136223846793005ULL + 1442695040888963407ULL;
    return rng >> 17;
}

static void must(sqlite3 *db, int rc, const char *what) {
    if (rc != SQLITE_OK && rc != SQLITE_DONE && rc != SQLITE_ROW) {
        fprintf(stderr, "%s failed: %d %s\n", what, rc, sqlite3_errmsg(db));
        exit(1);
    }
}

static void run(sqlite3 *db, const char *sql) {
    char *err = NULL;
    int rc = sqlite3_exec(db, sql, NULL, NULL, &err);
    if (rc != SQLITE_OK) {
        fprintf(stderr, "exec '%s' failed: %s\n", sql, err ? err : "?");
        exit(1);
    }
}

int main(int argc, char **argv) {
    if (argc != 3) {
        fprintf(stderr, "usage: %s <db-path> <nrows>\n", argv[0]);
        return 2;
    }
    const char *path = argv[1];
    long nrows = atol(argv[2]);

    remove(path);
    sqlite3 *db = NULL;
    must(db, sqlite3_open_v2(path, &db,
                             SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE, NULL),
         "open");

    run(db, "PRAGMA page_size=4096;");
    run(db, "PRAGMA journal_mode=OFF;");
    run(db, "PRAGMA synchronous=OFF;");
    run(db, "PRAGMA cache_size=-524288;");
    run(db, "CREATE TABLE records("
            "  id INTEGER PRIMARY KEY,"
            "  k  INTEGER NOT NULL,"
            "  v0 INTEGER NOT NULL,"
            "  v1 INTEGER NOT NULL,"
            "  payload TEXT NOT NULL);");

    sqlite3_stmt *ins = NULL;
    must(db, sqlite3_prepare_v2(db,
             "INSERT INTO records(id,k,v0,v1,payload) VALUES(?,?,?,?,?)", -1,
             &ins, NULL), "prepare insert");

    char payload[65];
    memset(payload, 'a', sizeof(payload) - 1);
    payload[sizeof(payload) - 1] = '\0';

    rng = 0x5deece66dULL;
    run(db, "BEGIN;");
    for (long i = 1; i <= nrows; i++) {
        uint64_t r0 = next_rand();
        uint64_t r1 = next_rand();
        /* k is a permutation-ish scatter over [0, 2*nrows) so index lookups
         * hit a different B-tree order than the rowid table. */
        long k = (long)((r0 * 2654435761ULL) % (uint64_t)(2 * nrows));
        for (int c = 0; c < 16; c++)
            payload[c] = (char)('a' + (int)((r1 >> (c * 2)) & 0xf));
        sqlite3_bind_int64(ins, 1, i);
        sqlite3_bind_int64(ins, 2, k);
        sqlite3_bind_int64(ins, 3, (sqlite3_int64)(r0 & 0xffffff));
        sqlite3_bind_int64(ins, 4, (sqlite3_int64)(r1 & 0xffffff));
        sqlite3_bind_text(ins, 5, payload, (int)sizeof(payload) - 1,
                          SQLITE_STATIC);
        int rc = sqlite3_step(ins);
        must(db, rc, "step insert");
        sqlite3_reset(ins);
        if ((i % 500000) == 0) {
            run(db, "COMMIT;");
            run(db, "BEGIN;");
            fprintf(stderr, "inserted %ld rows\n", i);
        }
    }
    run(db, "COMMIT;");
    sqlite3_finalize(ins);

    run(db, "CREATE INDEX idx_k ON records(k);");
    run(db, "ANALYZE;");
    sqlite3_close(db);
    fprintf(stderr, "setup done: %ld rows\n", nrows);
    return 0;
}