// Database class implementation
/*
  (C) Copyright 2000-2006 T.I.P. Group S.A. and the IBPP Team (www.ibpp.org)

  The contents of this file are subject to the IBPP License (the "License");
  you may not use this file except in compliance with the License.  You may
  obtain a copy of the License at http://www.ibpp.org or in the 'license.txt'
  file which must have been distributed along with this file.

  This software, distributed under the License, is distributed on an "AS IS"
  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the
  License for the specific language governing rights and limitations
  under the License.
*/

#ifdef _MSC_VER
#pragma warning(disable: 4786 4996)
#ifndef _DEBUG
#pragma warning(disable: 4702)
#endif
#endif

#include "_ibpp.h"

#ifdef HAS_HDRSTOP
#pragma hdrstop
#endif

#include <algorithm>

using namespace ibpp_internals;

//  (((((((( OBJECT INTERFACE IMPLEMENTATION ))))))))

void DatabaseImpl::Create(int dialect)
{
    if (mHandle != 0)
        throw LogicExceptionImpl("Database::Create", _("Database is already connected."));
    if (mDatabaseName.empty())
        throw LogicExceptionImpl("Database::Create", _("Unspecified database name."));
    if (dialect != 1 && dialect != 3)
        throw LogicExceptionImpl("Database::Create", _("Only dialects 1 and 3 are supported."));

    // Build the SQL Create Statement
    std::string create;
    create.assign("CREATE DATABASE '");
    if (! mServerName.empty()) create.append(mServerName).append(":");
    create.append(mDatabaseName).append("' ");

    if (! mUserName.empty())
        create.append("USER '").append(mUserName).append("' ");
    if (! mUserPassword.empty())
        create.append("PASSWORD '").append(mUserPassword).append("' ");
    if (! mCreateParams.empty()) create.append(mCreateParams);

    // Call ExecuteImmediate to create the database
    isc_tr_handle tr_handle = 0;
    IBS status;
    (*getGDS().Call()->m_dsql_execute_immediate)(status.Self(), &mHandle, &tr_handle,
        0, const_cast<char*>(create.c_str()), short(dialect), NULL);
    if (status.Errors())
        throw SQLExceptionImpl(status, "Database::Create", _("isc_dsql_execute_immediate failed"));

    Disconnect();
}

void DatabaseImpl::Connect()
{
    if (mHandle != 0) return;   // Already connected

    if (mDatabaseName.empty())
        throw LogicExceptionImpl("Database::Connect", _("Unspecified database name."));

    // Build a DPB based on the properties
    DPB dpb;
    if (! mUserName.empty())
    {
        dpb.Insert(isc_dpb_user_name, mUserName.c_str());
        dpb.Insert(isc_dpb_password, mUserPassword.c_str());
    }
    else
        dpb.Insert(isc_dpb_trusted_auth, true);
    if (! mRoleName.empty()) dpb.Insert(isc_dpb_sql_role_name, mRoleName.c_str());
    if (! mCharSet.empty()) dpb.Insert(isc_dpb_lc_ctype, mCharSet.c_str());

    std::string connect;
    if (! mServerName.empty())
        connect.assign(mServerName).append(":");
    connect.append(mDatabaseName);

    IBS status;
    (*getGDS().Call()->m_attach_database)(status.Self(), (short)connect.size(),
        const_cast<char*>(connect.c_str()), &mHandle, dpb.Size(), dpb.Self());
    if (status.Errors())
    {
        mHandle = 0;     // Should be, but better be sure...
        throw SQLExceptionImpl(status, "Database::Connect", _("isc_attach_database failed"));
    }

    // Now, get ODS version information and dialect.
    // If ODS major is lower of equal to 9, we reject the connection.
    // If ODS major is 10 or higher, this is at least an InterBase 6.x Server
    // OR FireBird 1.x Server.

    char items[] = {isc_info_ods_version,
                    isc_info_db_sql_dialect,
                    isc_info_end};
    RB result(100);

    status.Reset();
    (*getGDS().Call()->m_database_info)(status.Self(), &mHandle, sizeof(items), items,
        result.Size(), result.Self());
    if (status.Errors())
    {
        status.Reset();
        (*getGDS().Call()->m_detach_database)(status.Self(), &mHandle);
        mHandle = 0;     // Should be, but better be sure...
        throw SQLExceptionImpl(status, "Database::Connect", _("isc_database_info failed"));
    }

    int ODS = result.GetValue(isc_info_ods_version);
    if (ODS <= 9)
    {
        status.Reset();
        (*getGDS().Call()->m_detach_database)(status.Self(), &mHandle);
        mHandle = 0;     // Should be, but better be sure...
        throw LogicExceptionImpl("Database::Connect",
            _("Unsupported Server : wrong ODS version (%d), at least '10' required."), ODS);
    }

    mDialect = result.GetValue(isc_info_db_sql_dialect);
    if (mDialect != 1 && mDialect != 3)
    {
        status.Reset();
        (*getGDS().Call()->m_detach_database)(status.Self(), &mHandle);
        mHandle = 0;     // Should be, but better be sure...
        throw LogicExceptionImpl("Database::Connect", _("Dialect 1 or 3 required"));
    }
}

void DatabaseImpl::Inactivate()
{
    if (mHandle == 0) return;   // Not connected anyway

    IBS status;

    // Rollback any started transaction...
    for (unsigned i = 0; i < mTransactions.size(); i++)
    {
        if (mTransactions[i]->Started())
            mTransactions[i]->Rollback();
    }

    // Cancel all pending event traps
    for (unsigned i = 0; i < mEvents.size(); i++)
        mEvents[i]->Clear();

    // Let's detach from all Blobs
    while (mBlobs.size() > 0)
        mBlobs.back()->DetachDatabaseImpl();

    // Let's detach from all Arrays
    while (mArrays.size() > 0)
        mArrays.back()->DetachDatabaseImpl();

    // Let's detach from all Statements
    while (mStatements.size() > 0)
        mStatements.back()->DetachDatabaseImpl();

    // Let's detach from all Transactions
    while (mTransactions.size() > 0)
        mTransactions.back()->DetachDatabaseImpl(this);

    // Let's detach from all Events
    while (mEvents.size() > 0)
        mEvents.back()->DetachDatabaseImpl();
}

void DatabaseImpl::Disconnect()
{
    if (mHandle == 0) return;   // Not connected anyway

    // Put the connection to rest
    Inactivate();

    // Detach from the server
    IBS status;
    (*getGDS().Call()->m_detach_database)(status.Self(), &mHandle);

    // Should we throw, set mHandle to 0 first, because Disconnect() may
    // be called from Database destructor (keeps the object coherent).
    mHandle = 0;
    if (status.Errors())
        throw SQLExceptionImpl(status, "Database::Disconnect", _("isc_detach_database failed"));
}

void DatabaseImpl::Drop()
{
    if (mHandle == 0)
        throw LogicExceptionImpl("Database::Drop", _("Database must be connected."));

    // Put the connection to a rest
    Inactivate();

    IBS vector;
    (*getGDS().Call()->m_drop_database)(vector.Self(), &mHandle);
    if (vector.Errors())
        throw SQLExceptionImpl(vector, "Database::Drop", _("isc_drop_database failed"));

    mHandle = 0;
}

IBPP::IDatabase * DatabaseImpl::Clone()
{
    // By definition the clone of an IBPP Database is a new Database.
    DatabaseImpl* clone = new DatabaseImpl(mServerName, mDatabaseName,
        mUserName, mUserPassword, mRoleName,
        mCharSet, mCreateParams);
    return clone;
}

void DatabaseImpl::Info(int* ODSMajor, int* ODSMinor,
    int* PageSize, int* Pages, int* Buffers, int* Sweep,
    bool* Sync, bool* Reserve, bool* ReadOnly)
{
    if (mHandle == 0)
        throw LogicExceptionImpl("Database::Info", _("Database is not connected."));

    char items[] = {isc_info_ods_version,
                    isc_info_ods_minor_version,
                    isc_info_page_size,
                    isc_info_allocation,
                    isc_info_num_buffers,
                    isc_info_sweep_interval,
                    isc_info_forced_writes,
                    isc_info_no_reserve,
                    isc_info_db_read_only,
                    isc_info_end};
    IBS status;
    RB result(256);

    status.Reset();
    (*getGDS().Call()->m_database_info)(status.Self(), &mHandle, sizeof(items), items,
        result.Size(), result.Self());
    if (status.Errors())
        throw SQLExceptionImpl(status, "Database::Info", _("isc_database_info failed"));

    if (ODSMajor != 0) *ODSMajor = result.GetValue(isc_info_ods_version);
    if (ODSMinor != 0) *ODSMinor = result.GetValue(isc_info_ods_minor_version);
    if (PageSize != 0) *PageSize = result.GetValue(isc_info_page_size);
    if (Pages != 0) *Pages = result.GetValue(isc_info_allocation);
    if (Buffers != 0) *Buffers = result.GetValue(isc_info_num_buffers);
    if (Sweep != 0) *Sweep = result.GetValue(isc_info_sweep_interval);
    if (Sync != 0)
        *Sync = result.GetValue(isc_info_forced_writes) == 1 ? true : false;
    if (Reserve != 0)
        *Reserve = result.GetValue(isc_info_no_reserve) == 1 ? false : true;
    if (ReadOnly != 0)
        *ReadOnly = result.GetValue(isc_info_db_read_only) == 1 ? true : false;
}

void DatabaseImpl::TransactionInfo(int* Oldest, int* OldestActive,
    int* OldestSnapshot, int* Next)
{
    if (mHandle == 0)
        throw LogicExceptionImpl("Database::TransactionInfo", _("Database is not connected."));

    char items[] = {isc_info_oldest_transaction,
                    isc_info_oldest_active,
                    isc_info_oldest_snapshot,
                    isc_info_next_transaction,
                    isc_info_end};
    IBS status;
    RB result(256);

    status.Reset();
    (*getGDS().Call()->m_database_info)(status.Self(), &mHandle, sizeof(items), items,
        result.Size(), result.Self());
    if (status.Errors())
        throw SQLExceptionImpl(status, "Database::TransactionInfo", _("isc_database_info failed"));

    if (Oldest != 0)
        *Oldest = result.GetValue(isc_info_oldest_transaction);
    if (OldestActive != 0)
        *OldestActive = result.GetValue(isc_info_oldest_active);
    if (OldestSnapshot != 0)
        *OldestSnapshot = result.GetValue(isc_info_oldest_snapshot);
    if (Next != 0)
        *Next = result.GetValue(isc_info_next_transaction);
}

void DatabaseImpl::Statistics(int* Fetches, int* Marks, int* Reads, int* Writes, int* CurrentMemory)
{
    if (mHandle == 0)
        throw LogicExceptionImpl("Database::Statistics", _("Database is not connected."));

    char items[] = {isc_info_fetches,
                    isc_info_marks,
                    isc_info_reads,
                    isc_info_writes,
                    isc_info_current_memory,
                    isc_info_end};
    IBS status;
    RB result(256);

    status.Reset();
    (*getGDS().Call()->m_database_info)(status.Self(), &mHandle, sizeof(items), items,
        result.Size(), result.Self());
    if (status.Errors())
        throw SQLExceptionImpl(status, "Database::Statistics", _("isc_database_info failed"));

    if (Fetches != 0) *Fetches = result.GetValue(isc_info_fetches);
    if (Marks != 0) *Marks = result.GetValue(isc_info_marks);
    if (Reads != 0) *Reads = result.GetValue(isc_info_reads);
    if (Writes != 0) *Writes = result.GetValue(isc_info_writes);
    if (CurrentMemory != 0) *CurrentMemory = result.GetValue(isc_info_current_memory);
}

void DatabaseImpl::Counts(int* Insert, int* Update, int* Delete,
    int* ReadIdx, int* ReadSeq)
{
    if (mHandle == 0)
        throw LogicExceptionImpl("Database::Counts", _("Database is not connected."));

    char items[] = {isc_info_insert_count,
                    isc_info_update_count,
                    isc_info_delete_count,
                    isc_info_read_idx_count,
                    isc_info_read_seq_count,
                    isc_info_end};
    IBS status;
    RB result(1024);

    status.Reset();
    (*getGDS().Call()->m_database_info)(status.Self(), &mHandle, sizeof(items), items,
        result.Size(), result.Self());
    if (status.Errors())
        throw SQLExceptionImpl(status, "Database::Counts", _("isc_database_info failed"));

    if (Insert != 0) *Insert = result.GetCountValue(isc_info_insert_count);
    if (Update != 0) *Update = result.GetCountValue(isc_info_update_count);
    if (Delete != 0) *Delete = result.GetCountValue(isc_info_delete_count);
    if (ReadIdx != 0) *ReadIdx = result.GetCountValue(isc_info_read_idx_count);
    if (ReadSeq != 0) *ReadSeq = result.GetCountValue(isc_info_read_seq_count);
}

void DatabaseImpl::DetailedCounts(IBPP::DatabaseCounts& counts)
{
    if (mHandle == 0)
        throw LogicExceptionImpl("Database::DetailedCounts", _("Database is not connected."));

    char items[] = {isc_info_insert_count,
                    isc_info_update_count,
                    isc_info_delete_count,
                    isc_info_end};
    IBS status;
    RB result(1024);

    status.Reset();
    (*getGDS().Call()->m_database_info)(status.Self(), &mHandle, sizeof(items), items,
        result.Size(), result.Self());
    if (status.Errors())
        throw SQLExceptionImpl(status, "Database::DetailedCounts", _("isc_database_info failed"));

    result.GetDetailedCounts(counts, isc_info_insert_count);
    result.GetDetailedCounts(counts, isc_info_update_count);
    result.GetDetailedCounts(counts, isc_info_delete_count);
}

void DatabaseImpl::Users(std::vector<std::string>& users)
{
    if (mHandle == 0)
        throw LogicExceptionImpl("Database::Users", _("Database is not connected."));

    char items[] = {isc_info_user_names,
                    isc_info_end};
    IBS status;
    RB result(8000);

    status.Reset();
    (*getGDS().Call()->m_database_info)(status.Self(), &mHandle, sizeof(items), items,
        result.Size(), result.Self());
    if (status.Errors())
        throw SQLExceptionImpl(status, "Database::Users", _("isc_database_info failed"));

    users.clear();
    char* p = result.Self();
    while (*p == isc_info_user_names)
    {
        p += 3;     // Get to the length byte (there are two undocumented bytes which we skip)
        int len = (int)(*p);
        ++p;        // Get to the first char of username
        if (len != 0) users.push_back(std::string().append(p, len));
        p += len;   // Skip username
    }
    return;
}

IBPP::IDatabase* DatabaseImpl::AddRef()
{
    ASSERTION(mRefCount >= 0);
    ++mRefCount;
    return this;
}

void DatabaseImpl::Release()
{
    // Release cannot throw, except in DEBUG builds on assertion
    ASSERTION(mRefCount >= 0);
    --mRefCount;
    try { if (mRefCount <= 0) delete this; }
        catch (...) { }
}

//  (((((((( OBJECT INTERNAL METHODS ))))))))

void DatabaseImpl::AttachTransactionImpl(TransactionImpl* tr)
{
    if (tr == 0)
        throw LogicExceptionImpl("Database::AttachTransaction",
                    _("Transaction object is null."));

    mTransactions.push_back(tr);
}

void DatabaseImpl::DetachTransactionImpl(TransactionImpl* tr)
{
    if (tr == 0)
        throw LogicExceptionImpl("Database::DetachTransaction",
                _("ITransaction object is null."));

    mTransactions.erase(std::find(mTransactions.begin(), mTransactions.end(), tr));
}

void DatabaseImpl::AttachStatementImpl(StatementImpl* st)
{
    if (st == 0)
        throw LogicExceptionImpl("Database::AttachStatement",
                    _("Can't attach a null Statement object."));

    mStatements.push_back(st);
}

void DatabaseImpl::DetachStatementImpl(StatementImpl* st)
{
    if (st == 0)
        throw LogicExceptionImpl("Database::DetachStatement",
                _("Can't detach a null Statement object."));

    mStatements.erase(std::find(mStatements.begin(), mStatements.end(), st));
}

void DatabaseImpl::AttachBlobImpl(BlobImpl* bb)
{
    if (bb == 0)
        throw LogicExceptionImpl("Database::AttachBlob",
                    _("Can't attach a null Blob object."));

    mBlobs.push_back(bb);
}

void DatabaseImpl::DetachBlobImpl(BlobImpl* bb)
{
    if (bb == 0)
        throw LogicExceptionImpl("Database::DetachBlob",
                _("Can't detach a null Blob object."));

    mBlobs.erase(std::find(mBlobs.begin(), mBlobs.end(), bb));
}

void DatabaseImpl::AttachArrayImpl(ArrayImpl* ar)
{
    if (ar == 0)
        throw LogicExceptionImpl("Database::AttachArray",
                    _("Can't attach a null Array object."));

    mArrays.push_back(ar);
}

void DatabaseImpl::DetachArrayImpl(ArrayImpl* ar)
{
    if (ar == 0)
        throw LogicExceptionImpl("Database::DetachArray",
                _("Can't detach a null Array object."));

    mArrays.erase(std::find(mArrays.begin(), mArrays.end(), ar));
}

void DatabaseImpl::AttachEventsImpl(EventsImpl* ev)
{
    if (ev == 0)
        throw LogicExceptionImpl("Database::AttachEventsImpl",
                    _("Can't attach a null Events object."));

    mEvents.push_back(ev);
}

void DatabaseImpl::DetachEventsImpl(EventsImpl* ev)
{
    if (ev == 0)
        throw LogicExceptionImpl("Database::DetachEventsImpl",
                _("Can't detach a null Events object."));

    mEvents.erase(std::find(mEvents.begin(), mEvents.end(), ev));
}

DatabaseImpl::DatabaseImpl(const std::string& ServerName, const std::string& DatabaseName,
                           const std::string& UserName, const std::string& UserPassword,
                           const std::string& RoleName, const std::string& CharSet,
                           const std::string& CreateParams) :

    mRefCount(0), mHandle(0),
    mServerName(ServerName), mDatabaseName(DatabaseName),
    mUserName(UserName), mUserPassword(UserPassword), mRoleName(RoleName),
    mCharSet(CharSet), mCreateParams(CreateParams),
    mDialect(3)
{
}

DatabaseImpl::~DatabaseImpl()
{
    try { if (Connected()) Disconnect(); }
        catch(...) { }
}
