/*
 *  Created by Colton Wolkins on 2015-08-15.
 *  Copyright 2015 Martin Moene. All rights reserved.
 *
 *  Distributed under the Boost Software License, Version 1.0. (See accompanying
 *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 */
#ifndef TWOBLUECUBES_CATCH_REPORTER_TAP_HPP_INCLUDED
#define TWOBLUECUBES_CATCH_REPORTER_TAP_HPP_INCLUDED


// Don't #include any Catch headers here - we can assume they are already
// included before this header.
// This is not good practice in general but is necessary in this case so this
// file can be distributed as a single header that works with the main
// Catch single header.

#include <algorithm>

namespace Catch {

    struct TAPReporter : StreamingReporterBase<TAPReporter> {

        using StreamingReporterBase::StreamingReporterBase;

        ~TAPReporter() override;

        static std::string getDescription() {
            return "Reports test results in TAP format, suitable for test harnesses";
        }

        ReporterPreferences getPreferences() const override {
            return m_reporterPrefs;
        }

        void noMatchingTestCases( std::string const& spec ) override {
            stream << "# No test cases matched '" << spec << "'" << std::endl;
        }

        void assertionStarting( AssertionInfo const& ) override {}

        bool assertionEnded( AssertionStats const& _assertionStats ) override {
            ++counter;

            stream << "# " << currentTestCaseInfo->name << std::endl;
            AssertionPrinter printer( stream, _assertionStats, counter );
            printer.print();

            stream << std::endl;
            return true;
        }

        void testRunEnded( TestRunStats const& _testRunStats ) override {
            printTotals( _testRunStats.totals );
            stream << "\n" << std::endl;
            StreamingReporterBase::testRunEnded( _testRunStats );
        }

    private:
        std::size_t counter = 0;
        class AssertionPrinter {
        public:
            AssertionPrinter& operator= ( AssertionPrinter const& ) = delete;
            AssertionPrinter( AssertionPrinter const& ) = delete;
            AssertionPrinter( std::ostream& _stream, AssertionStats const& _stats, std::size_t _counter )
            : stream( _stream )
            , result( _stats.assertionResult )
            , messages( _stats.infoMessages )
            , itMessage( _stats.infoMessages.begin() )
            , printInfoMessages( true )
            , counter(_counter)
            {}

            void print() {
                itMessage = messages.begin();

                switch( result.getResultType() ) {
                    case ResultWas::Ok:
                        printResultType( passedString() );
                        printOriginalExpression();
                        printReconstructedExpression();
                        if ( ! result.hasExpression() )
                            printRemainingMessages( Colour::None );
                        else
                            printRemainingMessages();
                        break;
                    case ResultWas::ExpressionFailed:
                        if (result.isOk()) {
                            printResultType(passedString());
                        } else {
                            printResultType(failedString());
                        }
                        printOriginalExpression();
                        printReconstructedExpression();
                        if (result.isOk()) {
                            printIssue(" # TODO");
                        }
                        printRemainingMessages();
                        break;
                    case ResultWas::ThrewException:
                        printResultType( failedString() );
                        printIssue( "unexpected exception with message:" );
                        printMessage();
                        printExpressionWas();
                        printRemainingMessages();
                        break;
                    case ResultWas::FatalErrorCondition:
                        printResultType( failedString() );
                        printIssue( "fatal error condition with message:" );
                        printMessage();
                        printExpressionWas();
                        printRemainingMessages();
                        break;
                    case ResultWas::DidntThrowException:
                        printResultType( failedString() );
                        printIssue( "expected exception, got none" );
                        printExpressionWas();
                        printRemainingMessages();
                        break;
                    case ResultWas::Info:
                        printResultType( "info" );
                        printMessage();
                        printRemainingMessages();
                        break;
                    case ResultWas::Warning:
                        printResultType( "warning" );
                        printMessage();
                        printRemainingMessages();
                        break;
                    case ResultWas::ExplicitFailure:
                        printResultType( failedString() );
                        printIssue( "explicitly" );
                        printRemainingMessages( Colour::None );
                        break;
                    // These cases are here to prevent compiler warnings
                    case ResultWas::Unknown:
                    case ResultWas::FailureBit:
                    case ResultWas::Exception:
                        printResultType( "** internal error **" );
                        break;
                }
            }

        private:
            static Colour::Code dimColour() { return Colour::FileName; }

            static const char* failedString() { return "not ok"; }
            static const char* passedString() { return "ok"; }

            void printSourceInfo() const {
                Colour colourGuard( dimColour() );
                stream << result.getSourceInfo() << ":";
            }

            void printResultType( std::string const& passOrFail ) const {
                if( !passOrFail.empty() ) {
                    stream << passOrFail << ' ' << counter << " -";
                }
            }

            void printIssue( std::string const& issue ) const {
                stream << " " << issue;
            }

            void printExpressionWas() {
                if( result.hasExpression() ) {
                    stream << ";";
                    {
                        Colour colour( dimColour() );
                        stream << " expression was:";
                    }
                    printOriginalExpression();
                }
            }

            void printOriginalExpression() const {
                if( result.hasExpression() ) {
                    stream << " " << result.getExpression();
                }
            }

            void printReconstructedExpression() const {
                if( result.hasExpandedExpression() ) {
                    {
                        Colour colour( dimColour() );
                        stream << " for: ";
                    }
                    std::string expr = result.getExpandedExpression();
                    std::replace( expr.begin(), expr.end(), '\n', ' ');
                    stream << expr;
                }
            }

            void printMessage() {
                if ( itMessage != messages.end() ) {
                    stream << " '" << itMessage->message << "'";
                    ++itMessage;
                }
            }

            void printRemainingMessages( Colour::Code colour = dimColour() ) {
                if (itMessage == messages.end()) {
                    return;
                }

                // using messages.end() directly (or auto) yields compilation error:
                std::vector<MessageInfo>::const_iterator itEnd = messages.end();
                const std::size_t N = static_cast<std::size_t>( std::distance( itMessage, itEnd ) );

                {
                    Colour colourGuard( colour );
                    stream << " with " << pluralise( N, "message" ) << ":";
                }

                for(; itMessage != itEnd; ) {
                    // If this assertion is a warning ignore any INFO messages
                    if( printInfoMessages || itMessage->type != ResultWas::Info ) {
                        stream << " '" << itMessage->message << "'";
                        if ( ++itMessage != itEnd ) {
                            Colour colourGuard( dimColour() );
                            stream << " and";
                        }
                    }
                }
            }

        private:
            std::ostream& stream;
            AssertionResult const& result;
            std::vector<MessageInfo> messages;
            std::vector<MessageInfo>::const_iterator itMessage;
            bool printInfoMessages;
            std::size_t counter;
        };

        void printTotals( const Totals& totals ) const {
            if( totals.testCases.total() == 0 ) {
                stream << "1..0 # Skipped: No tests ran.";
            } else {
                stream << "1.." << counter;
            }
        }
    };

#ifdef CATCH_IMPL
    TAPReporter::~TAPReporter() {}
#endif

    CATCH_REGISTER_REPORTER( "tap", TAPReporter )

} // end namespace Catch

#endif // TWOBLUECUBES_CATCH_REPORTER_TAP_HPP_INCLUDED