#include <stdint.h>
#include <stddef.h>

#include <logger.h>
#include <database.h>

#include <migrations/0.sql.h>

sqlite3 *global_database;

int
database_migrate()
{
    uint16_t version_num = 0;
    int s, rc;
    sqlite3_stmt *stmt;
    sqlite3_prepare_v2(global_database, "SELECT version_num FROM meta LIMIT 1;", -1, &stmt, NULL);
    s = sqlite3_step(stmt);
    if (s == SQLITE_ROW)
    {
        version_num = sqlite3_column_int(stmt, 0);
    }
    else
    {
        version_num = 0;
    }

    uint16_t new_version_num = version_num;
    char* err_msg;

    sqlite3_finalize(stmt);

    switch(version_num)
    {
        case 0:
            LOG_INFO("migrating LEVEL 0\n");
            rc = sqlite3_exec(global_database, (const char *)sql_migration_0_sql, NULL, NULL, &err_msg);
            if(rc != 0)
            {
                LOG_FATAL("couldn't migrate LEVEL 0 (%s)\n", err_msg);
                break;
            }
            new_version_num = 1;
        default:
            break;
    }

    if(version_num == 0)
    {
        sqlite3_prepare_v2(global_database, "INSERT INTO meta (version_num) VALUES (?1);", -1, &stmt, NULL);
    }
    else
    {
        sqlite3_prepare_v2(global_database, "UPDATE meta SET version_num=?1;", -1, &stmt, NULL);
    }
    sqlite3_bind_int(stmt, 1, new_version_num);

    rc = sqlite3_step(stmt);
    if (rc != SQLITE_DONE)
    {
        LOG_FATAL("couldn't write new schema version");
    }

    sqlite3_finalize(stmt);

    return rc != SQLITE_DONE;
}