/*
 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2009 Google 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 COMPUTER, 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 COMPUTER, 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. 
 */

#ifndef ResourceResponseBase_h
#define ResourceResponseBase_h

#include "HTTPHeaderMap.h"
#include "KURL.h"

#include <memory>

namespace WebCore {

class ResourceResponse;
struct CrossThreadResourceResponseData;

// Do not use this class directly, use the class ResponseResponse instead
class ResourceResponseBase : public FastAllocBase {
public:
    static std::auto_ptr<ResourceResponse> adopt(std::auto_ptr<CrossThreadResourceResponseData>);

    // Gets a copy of the data suitable for passing to another thread.
    std::auto_ptr<CrossThreadResourceResponseData> copyData() const;

    bool isNull() const { return m_isNull; }
    bool isHTTP() const;

    const KURL& url() const;
    void setURL(const KURL& url);

    const String& mimeType() const;
    void setMimeType(const String& mimeType);

    long long expectedContentLength() const;
    void setExpectedContentLength(long long expectedContentLength);

    const String& textEncodingName() const;
    void setTextEncodingName(const String& name);

    // FIXME should compute this on the fly
    const String& suggestedFilename() const;
    void setSuggestedFilename(const String&);

    int httpStatusCode() const;
    void setHTTPStatusCode(int);
    
    const String& httpStatusText() const;
    void setHTTPStatusText(const String&);
    
    String httpHeaderField(const AtomicString& name) const;
    String httpHeaderField(const char* name) const;
    void setHTTPHeaderField(const AtomicString& name, const String& value);
    const HTTPHeaderMap& httpHeaderFields() const;

    bool isMultipart() const { return mimeType() == "multipart/x-mixed-replace"; }

    bool isAttachment() const;
    
    // FIXME: These are used by PluginStream on some platforms. Calculations may differ from just returning plain Last-odified header.
    // Leaving it for now but this should go away in favor of generic solution.
    void setLastModifiedDate(time_t);
    time_t lastModifiedDate() const; 

    // These functions return parsed values of the corresponding response headers.
    // NaN means that the header was not present or had invalid value.
    bool cacheControlContainsNoCache() const;
    bool cacheControlContainsNoStore() const;
    bool cacheControlContainsMustRevalidate() const;
    double cacheControlMaxAge() const;
    double date() const;
    double age() const;
    double expires() const;
    double lastModified() const;

    // The ResourceResponse subclass may "shadow" this method to provide platform-specific memory usage information
    unsigned memoryUsage() const
    {
        // average size, mostly due to URL and Header Map strings
        return 1280;
    }

    static bool compare(const ResourceResponse& a, const ResourceResponse& b);

protected:
    ResourceResponseBase();
    ResourceResponseBase(const KURL& url, const String& mimeType, long long expectedLength, const String& textEncodingName, const String& filename);

    void lazyInit() const;

    // The ResourceResponse subclass may "shadow" this method to lazily initialize platform specific fields
    void platformLazyInit() { }

    // The ResourceResponse subclass may "shadow" this method to compare platform specific fields
    static bool platformCompare(const ResourceResponse&, const ResourceResponse&) { return true; }

    KURL m_url;
    String m_mimeType;
    long long m_expectedContentLength;
    String m_textEncodingName;
    String m_suggestedFilename;
    int m_httpStatusCode;
    String m_httpStatusText;
    HTTPHeaderMap m_httpHeaderFields;
    time_t m_lastModifiedDate;

    bool m_isNull : 1;
    
private:
    void parseCacheControlDirectives() const;

    mutable bool m_haveParsedCacheControlHeader : 1;
    mutable bool m_haveParsedAgeHeader : 1;
    mutable bool m_haveParsedDateHeader : 1;
    mutable bool m_haveParsedExpiresHeader : 1;
    mutable bool m_haveParsedLastModifiedHeader : 1;

    mutable bool m_cacheControlContainsNoCache : 1;
    mutable bool m_cacheControlContainsNoStore : 1;
    mutable bool m_cacheControlContainsMustRevalidate : 1;
    mutable double m_cacheControlMaxAge;

    mutable double m_age;
    mutable double m_date;
    mutable double m_expires;
    mutable double m_lastModified;
};

inline bool operator==(const ResourceResponse& a, const ResourceResponse& b) { return ResourceResponseBase::compare(a, b); }
inline bool operator!=(const ResourceResponse& a, const ResourceResponse& b) { return !(a == b); }

struct CrossThreadResourceResponseData : Noncopyable {
    KURL m_url;
    String m_mimeType;
    long long m_expectedContentLength;
    String m_textEncodingName;
    String m_suggestedFilename;
    int m_httpStatusCode;
    String m_httpStatusText;
    OwnPtr<CrossThreadHTTPHeaderMapData> m_httpHeaders;
    time_t m_lastModifiedDate;
};

} // namespace WebCore

#endif // ResourceResponseBase_h