#include "agentsession.hpp"
#include <eepp/system/filesystem.hpp>
#include <eepp/system/log.hpp>

namespace ecode { namespace acp {

AgentSession::AgentSession( std::shared_ptr<ThreadPool> threadPool,
							const ACPClient::Config& config ) :
	mThreadPool( threadPool ), mClient( std::make_unique<ACPClient>( threadPool, config ) ) {
	setupClient();
}

AgentSession::~AgentSession() {
	stop();
}

bool AgentSession::start( const std::function<void( bool )>& onReady ) {
	if ( mClient->start() ) {
		InitializeRequest req;
		req.clientCapabilities.terminal = true;
		req.clientCapabilities.fsReadTextFile = true;
		req.clientCapabilities.fsWriteTextFile = true;

		mClient->initialize(
			req, [this, onReady]( const InitializeResponse&, const std::optional<ResponseError>& err ) {
				if ( err ) {
					if ( onReady )
						onReady( false );
					return;
				}
				NewSessionRequest nreq;
				nreq.cwd = mClient->isReady() ? mClient->getConfig().workingDirectory : "";
				mClient->newSession(
					nreq, [this, onReady]( const NewSessionResponse& nres,
										   const std::optional<ResponseError>& err ) {
						if ( err ) {
							if ( onReady )
								onReady( false );
							return;
						}
						mSessionId = nres.sessionId;
						mConfigOptions = nres.configOptions;
						if ( onReady )
							onReady( true );
					} );
			} );
		return true;
	}
	if ( onReady )
		onReady( false );
	return false;
}

bool AgentSession::startLoaded( const std::string& sessionId,
								const std::function<void( bool )>& onReady ) {
	if ( mClient->start() ) {
		InitializeRequest req;
		req.clientCapabilities.terminal = true;
		req.clientCapabilities.fsReadTextFile = true;
		req.clientCapabilities.fsWriteTextFile = true;

		mClient->initialize(
			req, [this, sessionId, onReady]( const InitializeResponse& ires,
											 const std::optional<ResponseError>& err ) {
				if ( err ) {
					if ( onReady )
						onReady( false );
					return;
				}
				if ( ires.agentCapabilities.loadSession ) {
					LoadSessionRequest lreq;
					lreq.sessionId = sessionId;
					lreq.cwd = mClient->isReady() ? mClient->getConfig().workingDirectory : "";
					mClient->loadSession(
						lreq, [this, sessionId, onReady]( const LoadSessionResponse& lres,
														  const std::optional<ResponseError>& err ) {
							if ( err ) {
								if ( onReady )
									onReady( false );
								return;
							}
							mSessionId = sessionId;
							mConfigOptions = lres.configOptions;
							if ( onReady )
								onReady( true );
						} );
				} else {
					if ( onReady )
						onReady( false );
				}
			} );
		return true;
	}
	if ( onReady )
		onReady( false );
	return false;
}

void AgentSession::listSessions(
	const std::function<void( const std::vector<SessionInfo>&, const std::optional<ResponseError>& )>&
		cb ) {
	if ( !mClient->isReady() ) {
		if ( cb )
			cb( {}, std::nullopt );
		return;
	}
	ListSessionsRequest req;
	req.cwd = mClient->getConfig().workingDirectory;
	mClient->listSessions(
		req, [cb]( const ListSessionsResponse& res, const std::optional<ResponseError>& err ) {
			if ( cb )
				cb( res.sessions, err );
		} );
}

void AgentSession::stop() {
	if ( mClient )
		mClient->stop();
}

void AgentSession::prompt(
	const PromptRequest& req,
	const std::function<void( const PromptResponse&, const std::optional<ResponseError>& )>& cb ) {
	mIsPrompting = true;
	mClient->prompt(
		req, [this, cb]( const PromptResponse& res, const std::optional<ResponseError>& err ) {
			mIsPrompting = false;
			if ( cb )
				cb( res, err );
		} );
}

void AgentSession::cancel() {
	if ( mClient && !mSessionId.empty() ) {
		mClient->cancel( mSessionId );
	}
}

void AgentSession::setTerminalData( const std::string& terminalId, UITerminal* uiTerm ) {
	mTerminals[terminalId] =
		TermData{ uiTerm->getTerm(), uiTerm->getTerm()->getTerminal(), uiTerm };
}

void AgentSession::setupClient() {
	mClient->onError = [this]( const ResponseError& err ) {
		if ( onError )
			onError( err );
	};

	mClient->onSessionUpdate = [this]( const json& msg ) {
		auto sessionUpdate = msg.value( "sessionUpdate", "" );
		if ( sessionUpdate == "config_options_update" && msg.contains( "configOptions" ) ) {
			mConfigOptions = msg["configOptions"];
		} else if ( msg.contains( "models" ) || msg.contains( "modes" ) ) {
			mConfigOptions = parseLegacyConfigOptions( msg, mConfigOptions );
		}
		if ( onSessionUpdate )
			onSessionUpdate( msg );
	};

	mClient->onReadTextFile = []( const ReadTextFileRequest& req, auto cb ) {
		ReadTextFileResponse res;
		std::string content;
		if ( FileSystem::fileGet( req.path, content ) ) {
			res.content = content;
		}
		cb( res );
	};

	mClient->onWriteTextFile = []( const WriteTextFileRequest& req, auto cb ) {
		FileSystem::fileWrite( req.path, req.content );
		cb( WriteTextFileResponse() );
	};

	mClient->onRequestPermission = [this]( const RequestPermissionRequest& req, auto cb ) {
		if ( onRequestPermission ) {
			onRequestPermission( req, cb );
		} else {
			RequestPermissionResponse res;
			res.outcome = "rejected";
			cb( res );
		}
	};

	mClient->onCreateTerminal = [this]( const CreateTerminalRequest& req, auto cb ) {
		CreateTerminalResponse res;
		std::string termId = String::format( "term-%u", String::hash( req.command ) );
		res.terminalId = termId;
		if ( onTerminalCreated ) {
			onTerminalCreated( req, termId );
		}
		cb( res );
	};

	mClient->onTerminalOutput = [this]( const TerminalOutputRequest& req, auto cb ) {
		TerminalOutputResponse res;
		res.output = "";
		res.truncated = false;
		auto it = mTerminals.find( req.terminalId );
		if ( it != mTerminals.end() && it->second.emulator ) {
			if ( it->second.emulator->hasExited() ) {
				TerminalExitStatus status;
				status.exitCode = it->second.emulator->getExitCode();
				res.exitStatus = status;
			}
		}
		cb( res );
	};

	mClient->onKillTerminal = [this]( const KillTerminalRequest& req, auto cb ) {
		auto it = mTerminals.find( req.terminalId );
		if ( it != mTerminals.end() && it->second.emulator ) {
			it->second.emulator->terminate();
		}
		cb( KillTerminalResponse() );
	};

	mClient->onReleaseTerminal = [this]( const ReleaseTerminalRequest& req, auto cb ) {
		auto it = mTerminals.find( req.terminalId );
		if ( it != mTerminals.end() ) {
			if ( it->second.emulator )
				it->second.emulator->terminate();
			if ( it->second.uiTerm )
				it->second.uiTerm->close();
			mTerminals.erase( it );
		}
		cb( ReleaseTerminalResponse() );
	};

	mClient->onWaitForTerminalExit = [this]( const WaitForTerminalExitRequest& req, auto cb ) {
		WaitForTerminalExitResponse res;
		auto it = mTerminals.find( req.terminalId );
		if ( it != mTerminals.end() && it->second.emulator ) {
			if ( it->second.emulator->hasExited() ) {
				res.exitCode = it->second.emulator->getExitCode();
			}
		}
		cb( res );
	};
}

}} // namespace ecode::acp