///////////////////////////////////////////////////////////////////////////////
// Name:        wx/webrequest.h
// Purpose:     wxWebRequest base classes
// Author:      Tobias Taschner
// Created:     2018-10-17
// Copyright:   (c) 2018 wxWidgets development team
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////

#ifndef _WX_WEBREQUEST_H
#define _WX_WEBREQUEST_H

#include "wx/defs.h"

#if wxUSE_WEBREQUEST

#include "wx/event.h"
#include "wx/object.h"
#include "wx/scopedptr.h"
#include "wx/sharedptr.h"
#include "wx/stream.h"
#include "wx/vector.h"

class wxWebResponse;
class wxWebSession;

WX_DECLARE_STRING_HASH_MAP(wxString, wxWebRequestHeaderMap);

class WXDLLIMPEXP_NET wxWebRequest : public wxEvtHandler, public wxRefCounter
{
public:
    enum State
    {
        State_Idle,
        State_Unauthorized,
        State_UnauthorizedProxy,
        State_Active,
        State_Completed,
        State_Failed,
        State_Cancelled
    };

    enum CredentialTarget
    {
        CredentialTarget_Server,
        CredentialTarget_Proxy
    };

    virtual ~wxWebRequest() { }

    virtual void SetHeader(const wxString& name, const wxString& value)
    { m_headers[name] = value; }

    virtual void SetMethod(const wxString& method) { m_method = method; }

    void SetData(const wxString& text, const wxString& contentType, const wxMBConv& conv = wxConvUTF8);

    void SetData(wxSharedPtr<wxInputStream> dataStream, const wxString& contentType, wxFileOffset dataSize = wxInvalidOffset);

    void SetCredentials(const wxString& user, const wxString& password,
        CredentialTarget target);

    void SetIgnoreServerErrorStatus(bool ignore) { m_ignoreServerErrorStatus = ignore; }

    virtual void Start() = 0;

    virtual void Cancel() = 0;

    virtual wxWebResponse* GetResponse() = 0;

    int GetId() const { return m_id; }

    State GetState() const { return m_state; }

protected:
    wxString m_method;
    wxWebRequestHeaderMap m_headers;
    wxFileOffset m_dataSize;
    wxSharedPtr<wxInputStream> m_dataStream;

    wxWebRequest(int id):
        m_id(id),
        m_state(State_Idle),
        m_ignoreServerErrorStatus(false),
        m_dataSize(0) { }

    void SetState(State state, const wxString& failMsg = "");

    bool CheckServerStatus();

private:
    int m_id;
    State m_state;
    bool m_ignoreServerErrorStatus;
    wxCharBuffer m_dataText;

    void ProcessStateEvent(State state, const wxString& failMsg);

    wxDECLARE_NO_COPY_CLASS(wxWebRequest);
};

class WXDLLIMPEXP_NET wxWebResponse
{
public:
    virtual ~wxWebResponse() { }

    virtual wxInt64 GetContentLength() const = 0;

    virtual wxString GetURL() const = 0;

    virtual wxString GetHeader(const wxString& name) const = 0;

    virtual int GetStatus() const = 0;

    virtual wxString GetStatusText() const = 0;

    virtual wxInputStream* GetStream() const = 0;

    virtual wxString AsString(wxMBConv* conv = NULL) const = 0;

protected:
    wxWebResponse() { }

private:
    wxDECLARE_NO_COPY_CLASS(wxWebResponse);
};

class WXDLLIMPEXP_NET wxWebSessionFactory
{
public:
    virtual wxWebSession* Create() = 0;

    virtual ~wxWebSessionFactory() { }
};

WX_DECLARE_STRING_HASH_MAP(wxSharedPtr<wxWebSessionFactory>, wxStringWebSessionFactoryMap);

extern WXDLLIMPEXP_DATA_NET(const char) wxWebSessionBackendDefault[];
extern WXDLLIMPEXP_DATA_NET(const char) wxWebSessionBackendWinHTTP[];
extern WXDLLIMPEXP_DATA_NET(const char) wxWebSessionBackendURLSession[];
extern WXDLLIMPEXP_DATA_NET(const char) wxWebSessionBackendCURL[];

class WXDLLIMPEXP_NET wxWebSession
{
public:
    virtual ~wxWebSession() { }

    virtual wxWebRequest* CreateRequest(const wxString& url, int id = wxID_ANY) = 0;

    virtual void SetHeader(const wxString& name, const wxString& value)
    { m_headers[name] = value; }

    const wxWebRequestHeaderMap& GetHeaders() const { return m_headers; }

    static wxWebSession& GetDefault();

    static wxWebSession* New(const wxString& backend = wxWebSessionBackendDefault);

    static void RegisterFactory(const wxString& backend, wxSharedPtr<wxWebSessionFactory> factory);

    static bool IsBackendAvailable(const wxString& backend);

protected:
    wxWebSession();

private:
    wxWebRequestHeaderMap m_headers;

    static wxScopedPtr<wxWebSession> ms_defaultSession;
    static wxStringWebSessionFactoryMap ms_factoryMap;

    static void InitFactoryMap();
};

class WXDLLIMPEXP_NET wxWebRequestEvent : public wxEvent
{
public:
    wxWebRequestEvent() {}
    wxWebRequestEvent(wxEventType type, int id, wxWebRequest::State state,
        wxWebResponse* response = NULL, const wxString& errorDesc = "")
        : wxEvent(id, type),
        m_state(state), m_response(response), m_errorDescription(errorDesc)
    { }

    wxWebRequest::State GetState() const { return m_state; }

    wxWebResponse* GetResponse() const { return m_response; }

    const wxString& GetErrorDescription() const { return m_errorDescription; }

    wxEvent* Clone() const wxOVERRIDE { return new wxWebRequestEvent(*this); }

private:
    wxWebRequest::State m_state;
    wxWebResponse* m_response;
    wxString m_errorDescription;
};

wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_NET, wxEVT_WEBREQUEST_STATE, wxWebRequestEvent);
wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_NET, wxEVT_WEBREQUEST_DATA, wxWebRequestEvent);
wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_NET, wxEVT_WEBREQUEST_DOWNLOAD_PROGRESS, wxWebRequestEvent);
wxDECLARE_EXPORTED_EVENT(WXDLLIMPEXP_NET, wxEVT_WEBREQUEST_UPLOAD_PROGRESS, wxWebRequestEvent);

#endif // wxUSE_WEBREQUEST

#endif // _WX_WEBREQUEST_H