// See the file "COPYING" in the main distribution directory for copyright.

#include "zeek/file_analysis/AnalyzerSet.h"

#include "zeek/CompHash.h"
#include "zeek/Val.h"
#include "zeek/file_analysis/Analyzer.h"
#include "zeek/file_analysis/File.h"
#include "zeek/file_analysis/Manager.h"

namespace zeek::file_analysis::detail {

static void analyzer_del_func(void* v) {
    file_analysis::Analyzer* a = (file_analysis::Analyzer*)v;

    a->Done();
    delete a;
}

AnalyzerSet::AnalyzerSet(File* arg_file) : file(arg_file) { analyzer_map.SetDeleteFunc(analyzer_del_func); }

AnalyzerSet::~AnalyzerSet() {
    while ( ! mod_queue.empty() ) {
        Modification* mod = mod_queue.front();
        mod->Abort();
        delete mod;
        mod_queue.pop();
    }
}

Analyzer* AnalyzerSet::Find(const zeek::Tag& tag, RecordValPtr args) {
    auto key = GetKey(tag, std::move(args));
    Analyzer* rval = analyzer_map.Lookup(key.get());
    return rval;
}

bool AnalyzerSet::Add(const zeek::Tag& tag, RecordValPtr args) {
    auto key = GetKey(tag, args);

    if ( analyzer_map.Lookup(key.get()) ) {
        DBG_LOG(DBG_FILE_ANALYSIS, "[%s] Instantiate analyzer %s skipped: already exists", file->GetID().c_str(),
                file_mgr->GetComponentName(tag).c_str());

        return true;
    }

    file_analysis::Analyzer* a = InstantiateAnalyzer(tag, std::move(args));

    if ( ! a )
        return false;

    Insert(a, std::move(key));

    return true;
}

Analyzer* AnalyzerSet::QueueAdd(const zeek::Tag& tag, RecordValPtr args) {
    auto key = GetKey(tag, args);
    file_analysis::Analyzer* a = InstantiateAnalyzer(tag, std::move(args));

    if ( ! a )
        return nullptr;

    mod_queue.push(new AddMod(a, std::move(key)));

    return a;
}

bool AnalyzerSet::AddMod::Perform(AnalyzerSet* set) {
    if ( set->analyzer_map.Lookup(key.get()) ) {
        DBG_LOG(DBG_FILE_ANALYSIS, "[%s] Add analyzer %s skipped: already exists", a->GetFile()->GetID().c_str(),
                file_mgr->GetComponentName(a->Tag()).c_str());

        Abort();
        return true;
    }

    set->Insert(a, std::move(key));

    return true;
}

void AnalyzerSet::AddMod::Abort() { delete a; }

bool AnalyzerSet::Remove(const zeek::Tag& tag, RecordValPtr args) { return Remove(tag, GetKey(tag, std::move(args))); }

bool AnalyzerSet::Remove(const zeek::Tag& tag, std::unique_ptr<zeek::detail::HashKey> key) {
    auto a = (file_analysis::Analyzer*)analyzer_map.Remove(key.get());

    if ( ! a ) {
        DBG_LOG(DBG_FILE_ANALYSIS, "[%s] Skip remove analyzer %s", file->GetID().c_str(),
                file_mgr->GetComponentName(tag).c_str());
        return false;
    }

    DBG_LOG(DBG_FILE_ANALYSIS, "[%s] Remove analyzer %s", file->GetID().c_str(),
            file_mgr->GetComponentName(tag).c_str());

    a->Done();

    // We don't delete the analyzer object right here because the remove
    // operation may execute at a time when it can still be accessed.
    // Instead we let the file know to delete the analyzer later.
    file->DoneWithAnalyzer(a);

    return true;
}

bool AnalyzerSet::QueueRemove(const zeek::Tag& tag, RecordValPtr args) {
    auto key = GetKey(tag, std::move(args));
    auto rval = analyzer_map.Lookup(key.get());
    mod_queue.push(new RemoveMod(tag, std::move(key)));
    return rval;
}

bool AnalyzerSet::RemoveMod::Perform(AnalyzerSet* set) { return set->Remove(tag, std::move(key)); }

std::unique_ptr<zeek::detail::HashKey> AnalyzerSet::GetKey(const zeek::Tag& t, RecordValPtr args) const {
    auto lv = make_intrusive<ListVal>(TYPE_ANY);
    lv->Append(t.AsVal());
    lv->Append(std::move(args));
    auto key = file_mgr->GetAnalyzerHash()->MakeHashKey(*lv, true);

    if ( ! key )
        reporter->InternalError("AnalyzerArgs type mismatch");

    return key;
}

file_analysis::Analyzer* AnalyzerSet::InstantiateAnalyzer(const Tag& tag, RecordValPtr args) const {
    auto a = file_mgr->InstantiateAnalyzer(tag, std::move(args), file);

    if ( ! a ) {
        auto c = file_mgr->Lookup(tag);

        if ( c && ! c->Enabled() )
            return nullptr;

        reporter->Error("[%s] Failed file analyzer %s instantiation", file->GetID().c_str(),
                        file_mgr->GetComponentName(tag).c_str());
        return nullptr;
    }

    return a;
}

void AnalyzerSet::Insert(file_analysis::Analyzer* a, std::unique_ptr<zeek::detail::HashKey> key) {
    DBG_LOG(DBG_FILE_ANALYSIS, "[%s] Add analyzer %s", file->GetID().c_str(),
            file_mgr->GetComponentName(a->Tag()).c_str());
    analyzer_map.Insert(key.get(), a);

    a->Init();
}

void AnalyzerSet::DrainModifications() {
    if ( mod_queue.empty() )
        return;

    DBG_LOG(DBG_FILE_ANALYSIS, "[%s] Start analyzer mod queue flush", file->GetID().c_str());
    do {
        Modification* mod = mod_queue.front();
        mod->Perform(this);
        delete mod;
        mod_queue.pop();
    } while ( ! mod_queue.empty() );
    DBG_LOG(DBG_FILE_ANALYSIS, "[%s] End flushing analyzer mod queue.", file->GetID().c_str());
}

} // namespace zeek::file_analysis::detail
