/*
 * Copyright (C) 2016 Apple, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "CachedResourceClient.h"
#include "CachedResourceHandle.h"
#include "CachedScript.h"
#include "LoadableScript.h"
#include "LoadableScriptError.h"
#include "ReferrerPolicy.h"
#include <wtf/TypeCasts.h>

namespace WebCore {

class WeakPtrImplWithEventTargetData;

// A CachedResourceHandle alone does not prevent the underlying CachedResource
// from purging its data buffer. This class holds a client until this class is
// destroyed in order to guarantee that the data buffer will not be purged.
class LoadableNonModuleScriptBase : public LoadableScript, protected CachedResourceClient {
public:
    virtual ~LoadableNonModuleScriptBase();

    bool isLoaded() const final;
    bool hasError() const final;
    std::optional<Error> takeError() final;
    bool wasCanceled() const final;

    Document* document() { return m_weakDocument.get(); }
    CachedScript& cachedScript() { return *m_cachedScript; }

    bool load(Document&, const URL&);
    bool isAsync() const { return m_isAsync; }
    const AtomString& integrity() const { return m_integrity; }

protected:
    LoadableNonModuleScriptBase(const AtomString& nonce, const AtomString& integrity, ReferrerPolicy, const AtomString& crossOriginMode, const String& charset, const AtomString& initiatorName, bool isInUserAgentShadowTree, bool isAsync);

private:
    void notifyFinished(CachedResource&, const NetworkLoadMetrics&) final;

protected:
    CachedResourceHandle<CachedScript> m_cachedScript { };
    WeakPtr<Document, WeakPtrImplWithEventTargetData> m_weakDocument;
    std::optional<Error> m_error { std::nullopt };
    const AtomString m_integrity;
    bool m_isAsync { false };
};


class LoadableClassicScript final : public LoadableNonModuleScriptBase {
public:
    static Ref<LoadableClassicScript> create(const AtomString& nonce, const AtomString& integrity, ReferrerPolicy, const AtomString& crossOriginMode, const String& charset, const AtomString& initiatorName, bool isInUserAgentShadowTree, bool isAsync);

    ScriptType scriptType() const final { return ScriptType::Classic; }

    void execute(ScriptElement&) final;

private:
    LoadableClassicScript(const AtomString& nonce, const AtomString& integrity, ReferrerPolicy, const AtomString& crossOriginMode, const String& charset, const AtomString& initiatorName, bool isInUserAgentShadowTree, bool isAsync);
};

}

SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::LoadableClassicScript)
    static bool isType(const WebCore::LoadableScript& script) { return script.isClassicScript(); }
SPECIALIZE_TYPE_TRAITS_END()
