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/*-------------------------------------------------------------------------
*
* plv8.h
*
* Copyright (c) 2009-2012, the PLV8JS Development Group.
*-------------------------------------------------------------------------
*/
#ifndef _PLV8_
#define _PLV8_

#include "plv8_config.h"
#include <v8.h>
#ifdef ENABLE_DEBUGGER_SUPPORT
#include <v8-debug.h>
#endif // ENABLE_DEBUGGER_SUPPORT
#include <vector>

extern "C" {
#include "postgres.h"

#include "access/htup.h"
#include "fmgr.h"
#include "mb/pg_wchar.h"
#include "utils/tuplestore.h"
#include "windowapi.h"
}

#ifdef _MSC_VER
#define __attribute__(what) __declspec what
#elif !defined(__GNUC__)
#define __attribute__(what)
#endif

/* numbers for plv8 object internal field */
/* Converter for SRF */
#define PLV8_INTNL_CONV 1
/* Tuplestore for SRF */
#define PLV8_INTNL_TUPSTORE 2
/* FunctionCallInfo for window functions */
#define PLV8_INTNL_FCINFO 3
#define PLV8_INTNL_MAX 4

enum Dialect{ PLV8_DIALECT_NONE, PLV8_DIALECT_COFFEE, PLV8_DIALECT_LIVESCRIPT };

/* js_error represents exceptions in JavaScript. */
class js_error
{
private:
char *m_msg;
char *m_detail;

public:
js_error() throw();
js_error(const char *msg) throw();
js_error(v8::TryCatch &try_catch) throw();
v8::Local<v8::Value> error_object();
__attribute__((noreturn)) void rethrow() throw();
};

/*
* pg_error represents ERROR in postgres.
* Instances of the class should be thrown only in PG_CATCH block.
*/
class pg_error
{
public:
__attribute__((noreturn)) void rethrow() throw();
};

/*
* When TYPCATEGORY_ARRAY, other fields are for element types.
*
* Note that postgres doesn't support type modifiers for arguments and result types.
*/
typedef struct plv8_type
{
Oid typid;
Oid ioparam;
int16 len;
bool byval;
char align;
char category;
FmgrInfo fn_input;
FmgrInfo fn_output;
v8::ExternalArrayType ext_array;
} plv8_type;

/*
* A multibyte string in the database encoding. It works more effective
* when the encoding is UTF8.
*/
class CString
{
private:
v8::String::Utf8Value m_utf8;
char *m_str;

public:
explicit CString(v8::Handle<v8::Value> value);
~CString();
operator char* () { return m_str; }
operator const char* () const { return m_str; }
const char* str(const char *ifnull = NULL) const
{ return m_str ? m_str : ifnull; }

private:
CString(const CString&);
CString& operator = (const CString&);
};

/*
* Records in postgres to JSON in v8 converter.
*/
class Converter
{
private:
TupleDesc m_tupdesc;
std::vector< v8::Handle<v8::String> > m_colnames;
std::vector< plv8_type > m_coltypes;
bool m_is_scalar;
MemoryContext m_memcontext;

public:
Converter(TupleDesc tupdesc);
Converter(TupleDesc tupdesc, bool is_scalar);
~Converter();
v8::Local<v8::Object> ToValue(HeapTuple tuple);
Datum ToDatum(v8::Handle<v8::Value> value, Tuplestorestate *tupstore = NULL);

private:
Converter(const Converter&);
Converter& operator = (const Converter&);
void Init();
};

/*
* Provide JavaScript JSON object functionality.
*/
class JSONObject
{
private:
v8::Handle<v8::Object> m_json;

public:
JSONObject();
v8::Handle<v8::Value> Parse(v8::Handle<v8::Value> str);
v8::Handle<v8::Value> Stringify(v8::Handle<v8::Value> val);
};

/*
* Check if this is a window function call. If so, we store fcinfo
* in plv8 object for API to use it. It would be possible to do it
* in the normal function cases, but currently nobody is using it
* and probably adds overhead. We need a class because the destructor
* makes sure the restore happens.
*/
class WindowFunctionSupport
{
private:
WindowObject m_winobj;
v8::Handle<v8::Object> m_plv8obj;
v8::Handle<v8::Value> m_prev_fcinfo;

public:
WindowFunctionSupport(v8::Handle<v8::Context> context,
FunctionCallInfo fcinfo)
{
m_winobj = PG_WINDOW_OBJECT();
if (WindowObjectIsValid(m_winobj))
{
m_plv8obj = v8::Handle<v8::Object>::Cast(
context->Global()->Get(v8::String::NewSymbol("plv8")));
if (m_plv8obj.IsEmpty())
throw js_error("plv8 object not found");
/* Stash the current item, just in case of nested call */
m_prev_fcinfo = m_plv8obj->GetInternalField(PLV8_INTNL_FCINFO);
m_plv8obj->SetInternalField(PLV8_INTNL_FCINFO,
v8::External::New(fcinfo));
}
}
bool IsWindowCall() { return WindowObjectIsValid(m_winobj); }
WindowObject GetWindowObject() { return m_winobj; }
~WindowFunctionSupport()
{
/* Restore the previous fcinfo if we saved. */
if (WindowObjectIsValid(m_winobj))
{
m_plv8obj->SetInternalField(PLV8_INTNL_FCINFO, m_prev_fcinfo);
}
}
};

/*
* In case this is nested via SPI, stash pre-registered converters
* for the previous SRF. We need a class because the destructor makes
* sure the restore happens.
*/
class SRFSupport
{
private:
v8::Handle<v8::Object> m_plv8obj;
v8::Handle<v8::Value> m_prev_conv, m_prev_tupstore;

public:
SRFSupport(v8::Handle<v8::Context> context,
Converter *conv, Tuplestorestate *tupstore)
{
m_plv8obj = v8::Handle<v8::Object>::Cast(
context->Global()->Get(v8::String::NewSymbol("plv8")));
if (m_plv8obj.IsEmpty())
throw js_error("plv8 object not found");
m_prev_conv = m_plv8obj->GetInternalField(PLV8_INTNL_CONV);
m_prev_tupstore = m_plv8obj->GetInternalField(PLV8_INTNL_TUPSTORE);
m_plv8obj->SetInternalField(PLV8_INTNL_CONV,
v8::External::New(conv));
m_plv8obj->SetInternalField(PLV8_INTNL_TUPSTORE,
v8::External::New(tupstore));
}
~SRFSupport()
{
/* Restore the previous items. */
m_plv8obj->SetInternalField(PLV8_INTNL_CONV, m_prev_conv);
m_plv8obj->SetInternalField(PLV8_INTNL_TUPSTORE, m_prev_tupstore);
}
};

extern v8::Local<v8::Function> find_js_function(Oid fn_oid);
extern v8::Local<v8::Function> find_js_function_by_name(const char *signature);
extern const char *FormatSPIStatus(int status) throw();
extern v8::Handle<v8::Value> ThrowError(const char *message) throw();
extern plv8_type *get_plv8_type(PG_FUNCTION_ARGS, int argno);

// plv8_type.cc
extern void plv8_fill_type(plv8_type *type, Oid typid, MemoryContext mcxt = NULL);
extern Oid inferred_datum_type(v8::Handle<v8::Value> value);
extern Datum ToDatum(v8::Handle<v8::Value> value, bool *isnull, plv8_type *type);
extern v8::Local<v8::Value> ToValue(Datum datum, bool isnull, plv8_type *type);
extern v8::Local<v8::String> ToString(Datum value, plv8_type *type);
extern v8::Local<v8::String> ToString(const char *str, int len = -1, int encoding = GetDatabaseEncoding());
extern char *ToCString(const v8::String::Utf8Value &value);
extern char *ToCStringCopy(const v8::String::Utf8Value &value);

// plv8_func.cc
extern v8::Handle<v8::Function> CreateYieldFunction(Converter *conv, Tuplestorestate *tupstore);
extern v8::Handle<v8::Value> Subtransaction(const v8::Arguments& args) throw();

extern void SetupPlv8Functions(v8::Handle<v8::ObjectTemplate> plv8);

#endif // _PLV8_
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