#include "externals.hh"

#include "c-opast.hh"
#include "c-ops.hh"
#include "c-opcomp.hh"
#include "c-opopt.hh"

#include <getopt.h>

#include <ebcl/Files.hh>
#include <ebcl/SRDText.hh>
#include <ebcl/Algorithms.hh>

using namespace ebcl;
using namespace opast;

namespace {

const struct option CmdLineOpts_[] = {
	{ "log-level" ,		required_argument ,	0 , 'L' } ,
	{ "source-path" ,	required_argument ,	0 , 's' } ,
	{ "config" ,		required_argument ,	0 , 'c' } ,
	{ 0 ,			0 ,			0 ,   0 }
};

/*============================================================================*/


void PrintStreamError(
		char const* const prefix ,
		T_String const& name ,
		X_StreamError const& error )
{
	T_StringBuilder sb;
	sb << prefix << " '" << name << "': " << error.what( );
	if ( error.code( ) == E_StreamError::SYSTEM_ERROR ) {
		sb << " (error code " << error.systemError( ) << ")";
	}
	sb << '\n' << '\0';
	fprintf( stderr , "%s" , sb.data( ) );
}

void WriteSRDError(
		T_StringBuilder& sb ,
		T_SRDError const& error )
{
	sb << error.location( ) << " - " << error.error( ) << "\n";
}


/*============================================================================*/

} // namespace

int main( int argc , char** argv )
{
	// Parse command line
	T_Optional< uint32_t > oLogLevel;
	T_String oSrcPath;
	int c;
	while ( ( c = getopt_long( argc , argv , "L:s:c:" , CmdLineOpts_ , nullptr ) ) != -1 ) {
		switch ( c ) {

		    case 'L':
			oLogLevel = uint32_t( atoi( optarg ) );
			break;

		    case 's':
			if ( oSrcPath ) {
				fprintf( stderr , "Duplicate source path\n" );
				exit( EXIT_FAILURE );
			}
			oSrcPath = optarg;
			break;

		    case 'c':
			fprintf( stderr , "-c/--config option ignored for now\n" );
			break;

		}
	}

	// Logger setup
	const uint32_t logLevel{ oLogLevel ? *oLogLevel : 0 };
	const auto logger{ [=]( F_OPGenLog func , uint32_t level ) {
		if ( level > logLevel ) {
			return;
		}
		auto sb{ func( ) };
		sb << '\0';
		printf( "LOG{%d} %s\n" , level , sb.data( ) );
	} };

	// Open file
	const T_String inputName( [&]() {
		T_StringBuilder sb;
		if ( oSrcPath ) {
			sb << oSrcPath;
			if ( !oSrcPath.endsWith( "/" ) ) {
				sb << '/';
			}
		}
		sb << "demo.srd";
		return T_String{ std::move( sb ) };
	}( ) );
	T_File input( inputName , E_FileMode::READ_ONLY );
	try {
		input.open( );
	} catch ( X_StreamError const& e ) {
		PrintStreamError( "Could not open" , inputName , e );
		return 1;
	}

	// Load SRD data
	T_SRDMemoryTarget srdOut;
	srdOut.clearComments( true ).clearFlushToken( true );
	try {
		T_SRDTextReader srdReader{ srdOut };
		T_FileInputStream fis{ input };
		srdReader.read( inputName , fis );
	} catch ( X_StreamError const& e ) {
		PrintStreamError( "Could not open" , inputName , e );
		return 1;
	} catch ( X_SRDErrors const& e ) {
		T_StringBuilder sb;
		const auto nErrors( e.errors.size( ) );
		for ( auto i = 0u ; i < nErrors ; i ++ ) {
			WriteSRDError( sb , e.errors[ i ] );
		}
		sb << "No parsing happened due to format errors\n" << '\0';
		fprintf( stderr , "%s" , sb.data( ) );
		return 2;
	}

	// Parse
	T_OpsParser parser;
	parser.setLogger( logger );
	if ( !parser.parse( srdOut.list( ) ) ) {
		T_StringBuilder sb;
		for ( auto const& err : parser.errors( ) ) {
			WriteSRDError( sb , err );
		}
		sb << "Parser failed\n" << '\0';
		fprintf( stderr , "%s" , sb.data( ) );
		return 3;
	}
	auto parsed{ parser.result( ) };

	// Optimize
	opopt::T_OptData od;
	od.logger = logger;
	//od.fixedSize = std::make_pair( 1280u , 720u );
	bool doneStuff{ false };
	do {
		doneStuff = opopt::FoldConstants( *parsed , od );
		doneStuff = opopt::RemoveDeadCode( *parsed , od ) || doneStuff;
	} while ( doneStuff );

	// Compile
	T_OpsCompiler compiler;
	compiler.compile( *parsed );
	return 0;
}