#include "Resolver.h"
#include "AlternativeFinder.h"
#include "Alternative.h"
#include "RenameVars.h"
#include "ResolveTypeof.h"
#include "SynTree/Statement.h"
#include "SynTree/Type.h"
#include "SynTree/Expression.h"
#include "SynTree/Initializer.h"
#include "SymTab/Indexer.h"
#include "utility.h"

#include <iostream>
using namespace std;

namespace ResolvExpr {
    class Resolver : public SymTab::Indexer {
      public:
	Resolver() : SymTab::Indexer( false ), switchType( 0 ) {}
  
	virtual void visit( FunctionDecl *functionDecl );
	virtual void visit( ObjectDecl *functionDecl );
	virtual void visit( TypeDecl *typeDecl );

	virtual void visit( ExprStmt *exprStmt );
	virtual void visit( IfStmt *ifStmt );
	virtual void visit( WhileStmt *whileStmt );
	virtual void visit( ForStmt *forStmt );
	virtual void visit( SwitchStmt *switchStmt );
	virtual void visit( ChooseStmt *switchStmt );
	virtual void visit( CaseStmt *caseStmt );
	virtual void visit( ReturnStmt *returnStmt );

	virtual void visit( SingleInit *singleInit );
	virtual void visit( ListInit *listInit );
      private:
	std::list< Type * > functionReturn;
	Type *initContext;
	Type *switchType;
    };

    void resolve( std::list< Declaration * > translationUnit ) {
	Resolver resolver;
	acceptAll( translationUnit, resolver );
#if 0
	for ( std::list< Declaration * >::iterator i = translationUnit.begin(); i != translationUnit.end(); ++i ) {
	    (*i)->print( std::cerr );
	    (*i)->accept( resolver );
	} // for
#endif
    }

    Expression *resolveInVoidContext( Expression *expr, const SymTab::Indexer &indexer ) {
	TypeEnvironment env;
	return resolveInVoidContext( expr, indexer, env );
    }

    namespace {
	void finishExpr( Expression *expr, const TypeEnvironment &env ) {
	    expr->set_env( new TypeSubstitution );
	    env.makeSubstitution( *expr->get_env() );
	}

	Expression *findVoidExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
	    global_renamer.reset();
	    TypeEnvironment env;
	    Expression *newExpr = resolveInVoidContext( untyped, indexer, env );
	    finishExpr( newExpr, env );
	    return newExpr;
	}
  
	Expression *findSingleExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
	    TypeEnvironment env;
	    AlternativeFinder finder( indexer, env );
	    finder.find( untyped );
#if 0
	    if ( finder.get_alternatives().size() != 1 ) {
		std::cout << "untyped expr is ";
		untyped->print( std::cout );
		std::cout << std::endl << "alternatives are:";
		for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
		    i->print( std::cout );
		} // for
	    } // if
#endif
	    assert( finder.get_alternatives().size() == 1 );
	    Alternative &choice = finder.get_alternatives().front();
	    Expression *newExpr = choice.expr->clone();
	    finishExpr( newExpr, choice.env );
	    return newExpr;
	}

	bool isIntegralType( Type *type ) {
	    if ( dynamic_cast< EnumInstType * >( type ) ) {
		return true;
	    } else if ( BasicType *bt = dynamic_cast< BasicType * >( type ) ) {
		return bt->isInteger();
	    } else {
		return true;
	    } // if
	}
  
	Expression *findIntegralExpression( Expression *untyped, const SymTab::Indexer &indexer ) {
	    TypeEnvironment env;
	    AlternativeFinder finder( indexer, env );
	    finder.find( untyped );
#if 0
	    if ( finder.get_alternatives().size() != 1 ) {
		std::cout << "untyped expr is ";
		untyped->print( std::cout );
		std::cout << std::endl << "alternatives are:";
		for ( std::list< Alternative >::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
		    i->print( std::cout );
		} // for
	    } // if
#endif
	    Expression *newExpr = 0;
	    const TypeEnvironment *newEnv = 0;
	    for ( AltList::const_iterator i = finder.get_alternatives().begin(); i != finder.get_alternatives().end(); ++i ) {
		if ( i->expr->get_results().size() == 1 && isIntegralType( i->expr->get_results().front() ) ) {
		    if ( newExpr ) {
			throw SemanticError( "Too many interpretations for switch control expression", untyped );
		    } else {
			newExpr = i->expr->clone();
			newEnv = &i->env;
		    } // if
		} // if
	    } // for
	    if ( !newExpr ) {
		throw SemanticError( "Too many interpretations for switch control expression", untyped );
	    } // if
	    finishExpr( newExpr, *newEnv );
	    return newExpr;
	}
  
    }
  
    void Resolver::visit( ObjectDecl *objectDecl ) {
	Type *new_type = resolveTypeof( objectDecl->get_type(), *this );
	objectDecl->set_type( new_type );
	initContext = new_type;
	SymTab::Indexer::visit( objectDecl );
    }
  
    void Resolver::visit( TypeDecl *typeDecl ) {
	if ( typeDecl->get_base() ) {
	    Type *new_type = resolveTypeof( typeDecl->get_base(), *this );
	    typeDecl->set_base( new_type );
	} // if
	SymTab::Indexer::visit( typeDecl );
    }
  
    void Resolver::visit( FunctionDecl *functionDecl ) {
#if 0
	std::cout << "resolver visiting functiondecl ";
	functionDecl->print( std::cout );
	std::cout << std::endl;
#endif
	Type *new_type = resolveTypeof( functionDecl->get_type(), *this );
	functionDecl->set_type( new_type );
	std::list< Type * > oldFunctionReturn = functionReturn;
	functionReturn.clear();
	for ( std::list< DeclarationWithType * >::const_iterator i = functionDecl->get_functionType()->get_returnVals().begin(); i != functionDecl->get_functionType()->get_returnVals().end(); ++i ) {
	    functionReturn.push_back( (*i)->get_type() );
	} // for
	SymTab::Indexer::visit( functionDecl );
	functionReturn = oldFunctionReturn;
    }

    void Resolver::visit( ExprStmt *exprStmt ) {
	if ( exprStmt->get_expr() ) {
	    Expression *newExpr = findVoidExpression( exprStmt->get_expr(), *this );
	    delete exprStmt->get_expr();
	    exprStmt->set_expr( newExpr );
	} // if
    }

    void Resolver::visit( IfStmt *ifStmt ) {
	Expression *newExpr = findSingleExpression( ifStmt->get_condition(), *this );
	delete ifStmt->get_condition();
	ifStmt->set_condition( newExpr );
	Visitor::visit( ifStmt );
    }

    void Resolver::visit( WhileStmt *whileStmt ) {
	Expression *newExpr = findSingleExpression( whileStmt->get_condition(), *this );
	delete whileStmt->get_condition();
	whileStmt->set_condition( newExpr );
	Visitor::visit( whileStmt );
    }

    void Resolver::visit( ForStmt *forStmt ) {
	Expression *newExpr;
	if ( forStmt->get_condition() ) {
	    newExpr = findSingleExpression( forStmt->get_condition(), *this );
	    delete forStmt->get_condition();
	    forStmt->set_condition( newExpr );
	} // if
  
	if ( forStmt->get_increment() ) {
	    newExpr = findVoidExpression( forStmt->get_increment(), *this );
	    delete forStmt->get_increment();
	    forStmt->set_increment( newExpr );
	} // if
  
	Visitor::visit( forStmt );
    }

    template< typename SwitchClass >
    void handleSwitchStmt( SwitchClass *switchStmt, SymTab::Indexer &visitor ) {
	Expression *newExpr;
	newExpr = findIntegralExpression( switchStmt->get_condition(), visitor );
	delete switchStmt->get_condition();
	switchStmt->set_condition( newExpr );
  
	visitor.Visitor::visit( switchStmt );
    }

    void Resolver::visit( SwitchStmt *switchStmt ) {
	handleSwitchStmt( switchStmt, *this );
    }

    void Resolver::visit( ChooseStmt *switchStmt ) {
	handleSwitchStmt( switchStmt, *this );
    }

    void Resolver::visit( CaseStmt *caseStmt ) {
	Visitor::visit( caseStmt );
    }

    void Resolver::visit( ReturnStmt *returnStmt ) {
	if ( returnStmt->get_expr() ) {
	    CastExpr *castExpr = new CastExpr( returnStmt->get_expr() );
	    cloneAll( functionReturn, castExpr->get_results() );
	    Expression *newExpr = findSingleExpression( castExpr, *this );
	    delete castExpr;
	    returnStmt->set_expr( newExpr );
	} // if
    }

    void Resolver::visit( SingleInit *singleInit ) {
	if ( singleInit->get_value() ) {
	    CastExpr *castExpr = new CastExpr( singleInit->get_value(), initContext->clone() );
	    Expression *newExpr = findSingleExpression( castExpr, *this );
	    delete castExpr;
	    singleInit->set_value( newExpr );
	} // if
//	singleInit->get_value()->accept( *this );
    }

    void Resolver::visit( ListInit *listInit ) {
	if ( ArrayType *at = dynamic_cast<ArrayType*>(initContext) ) {
	    initContext = at->get_base();
	    Visitor::visit( listInit );
	} else if ( StructInstType *st = dynamic_cast<StructInstType*>(initContext) ) {
	    StructDecl *baseStruct = st->get_baseStruct();
	    std::list<Declaration *>::iterator iter1( baseStruct->get_members().begin() );
	    std::list<Initializer *>::iterator iter2( listInit->begin_initializers() );
	    for ( ; iter1 != baseStruct->get_members().end() && iter2 != listInit->end_initializers(); ++iter2 ) {
		if ( (*iter2)->get_designators().empty() ) {
		    DeclarationWithType *dt = dynamic_cast<DeclarationWithType *>( *iter1 );
		    initContext = dt->get_type();
		    (*iter2)->accept( *this );
		    ++iter1;
		} else {
		    StructDecl *st = baseStruct;
		    iter1 = st->get_members().begin();
		    std::list<Expression *>::iterator iter3( (*iter2)->get_designators().begin() );
		    for ( ; iter3 != (*iter2)->get_designators().end(); ++iter3 ) {
			NameExpr *key = dynamic_cast<NameExpr *>( *iter3 );
			assert( key );
			for ( ; iter1 != st->get_members().end(); ++iter1 ) {
			    if ( key->get_name() == (*iter1)->get_name() ) {
				(*iter1)->print( cout );
				cout << key->get_name() << endl;
				ObjectDecl *fred = dynamic_cast<ObjectDecl *>( *iter1 );
				assert( fred );
				StructInstType *mary = dynamic_cast<StructInstType*>( fred->get_type() );
				assert( mary );
				st = mary->get_baseStruct();
				iter1 = st->get_members().begin();
				break;
			    } // if
			}  // for
		    } // for
		    ObjectDecl *fred = dynamic_cast<ObjectDecl *>( *iter1 );
		    assert( fred );
		    initContext = fred->get_type();
		    (*listInit->begin_initializers())->accept( *this );
		} // if
	    } // for
	} else if ( UnionInstType *st = dynamic_cast<UnionInstType*>(initContext) ) {
	    DeclarationWithType *dt = dynamic_cast<DeclarationWithType *>( *st->get_baseUnion()->get_members().begin() );
	    initContext = dt->get_type();
	    (*listInit->begin_initializers())->accept( *this );
	} // if
    }
} // namespace ResolvExpr