// Copyright (c) 2024, Compiler Explorer Authors
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright notice,
//       this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

import fs from 'node:fs/promises';
import path from 'node:path';

import {splitArguments} from '../../shared/common-utils.js';
import {
    BuildResult,
    ExecutionOptions,
    ExecutionOptionsWithEnv,
    ExecutionParams,
} from '../../types/compilation/compilation.interfaces.js';
import {
    BasicExecutionResult,
    ConfiguredRuntimeTool,
    ConfiguredRuntimeTools,
    ExecutableExecutionOptions,
    RuntimeToolType,
    UnprocessedExecResult,
} from '../../types/execution/execution.interfaces.js';
import {addHeaptrackResults} from '../artifact-utils.js';
import {assert, unwrap} from '../assert.js';
import {CompilationEnvironment} from '../compilation-env.js';
import * as exec from '../exec.js';
import {logger} from '../logger.js';
import {Packager} from '../packager.js';
import {propsFor} from '../properties.js';
import {HeaptrackWrapper} from '../runtime-tools/heaptrack-wrapper.js';
import * as temp from '../temp.js';
import * as utils from '../utils.js';

import {ExecutablePackageCacheMiss, IExecutionEnvironment} from './execution-env.interfaces.js';

export class LocalExecutionEnvironment implements IExecutionEnvironment {
    protected packager: Packager;
    protected dirPath: string;
    protected buildResult: BuildResult | undefined;
    protected environment: CompilationEnvironment;
    protected timeoutMs: number;
    protected sandboxType: string;
    protected useSanitizerEnvHints: boolean;
    protected maxExecOutputSize: number;

    static get key() {
        return 'local';
    }

    constructor(environment: CompilationEnvironment) {
        this.environment = environment;
        this.timeoutMs = this.environment.ceProps('binaryExecTimeoutMs', 2000);
        this.maxExecOutputSize = this.environment.ceProps('max-executable-output-size', 32 * 1024);

        this.useSanitizerEnvHints = true;

        const execProps = propsFor('execution');
        this.sandboxType = execProps('sandboxType', 'none');

        this.packager = new Packager();
        this.dirPath = 'not initialized';
    }

    protected async executableGet(hash: string, destinationFolder: string) {
        const result = await this.environment.executableCache.get(hash);
        if (!result.hit) return null;
        const filepath = destinationFolder + '/' + hash;
        await fs.writeFile(filepath, unwrap(result.data));
        return filepath;
    }

    protected async loadPackageWithExecutable(hash: string, dirPath: string): Promise<BuildResult> {
        const compilationResultFilename = 'compilation-result.json';
        const startTime = process.hrtime.bigint();
        const outputFilename = await this.executableGet(hash, dirPath);
        if (outputFilename) {
            logger.debug(`Using cached package ${outputFilename}`);
            await this.packager.unpack(outputFilename, dirPath);
            const buildResultsBuf = await fs.readFile(path.join(dirPath, compilationResultFilename));
            const buildResults = JSON.parse(buildResultsBuf.toString('utf8'));
            logger.debug(hash + ' => ' + JSON.stringify(buildResults));
            const endTime = process.hrtime.bigint();

            let inputFilename = '';
            if (buildResults.inputFilename) {
                inputFilename = path.join(dirPath, path.basename(buildResults.inputFilename));
            }

            let executableFilename = '';
            if (buildResults.executableFilename) {
                const execPath = utils.maskRootdir(buildResults.executableFilename);
                executableFilename = path.join(dirPath, execPath);
                logger.debug('executableFilename => ' + executableFilename);
            } else {
                logger.error(`No executableFilename provided for package ${hash}`);
            }

            return Object.assign({}, buildResults, {
                code: 0,
                inputFilename: inputFilename,
                dirPath: dirPath,
                executableFilename: executableFilename,
                packageDownloadAndUnzipTime: utils.deltaTimeNanoToMili(startTime, endTime),
            });
        }
        throw new ExecutablePackageCacheMiss('Tried to get executable from cache, but got a cache miss');
    }

    async downloadExecutablePackage(hash: string): Promise<void> {
        this.dirPath = await temp.mkdir(utils.ce_temp_prefix);

        this.buildResult = await this.loadPackageWithExecutable(hash, this.dirPath);
    }

    protected getDefaultExecOptions(params: ExecutionParams): ExecutionOptionsWithEnv {
        const env: Record<string, string> = {};
        env.PATH = '';

        if (params.runtimeTools) {
            const runtimeEnv = params.runtimeTools.find(tool => tool.name === RuntimeToolType.env);
            if (runtimeEnv) {
                for (const opt of runtimeEnv.options) {
                    env[opt.name] = opt.value;
                }
            }
        }

        if (this.buildResult?.defaultExecOptions?.env?.PATH) {
            if (env.PATH.length > 0)
                env.PATH = env.PATH + path.delimiter + this.buildResult.defaultExecOptions.env.PATH;
            else env.PATH = this.buildResult.defaultExecOptions.env.PATH;
        }

        let extraLdPaths: string[] = [];
        if (env.LD_LIBRARY_PATH) {
            extraLdPaths = env.LD_LIBRARY_PATH.split(path.delimiter);
            delete env.LD_LIBRARY_PATH;
        }

        const execOptions: ExecutionOptionsWithEnv = {
            env,
        };

        if (this.buildResult?.preparedLdPaths) {
            execOptions.ldPath = this.buildResult.preparedLdPaths.concat(extraLdPaths);
        } else {
            execOptions.ldPath = extraLdPaths;
        }

        return execOptions;
    }

    async execute(params: ExecutionParams): Promise<BasicExecutionResult> {
        assert(this.buildResult);
        assert(this.dirPath !== 'not initialized');

        const execExecutableOptions: ExecutableExecutionOptions = {
            args: typeof params.args === 'string' ? splitArguments(params.args) : params.args || [],
            stdin: params.stdin || '',
            ldPath: this.buildResult.preparedLdPaths || [],
            env: {},
            runtimeTools: params.runtimeTools,
        };

        // note: this is for a small transition period only, can be removed after a few days
        const file = utils.maskRootdir(this.buildResult.executableFilename);
        assert(file !== '', 'Internal error, no executableFilename available');

        return await this.execBinary(file, execExecutableOptions, this.dirPath);
    }

    static setEnvironmentVariablesFromRuntime(configuredTools: ConfiguredRuntimeTools, execOptions: ExecutionOptions) {
        for (const runtime of configuredTools) {
            if (runtime.name === RuntimeToolType.env) {
                for (const env of runtime.options) {
                    if (!execOptions.env) execOptions.env = {};

                    execOptions.env[env.name] = env.value;
                }
            }
        }
    }

    async execBinary(
        executable: string,
        executeParameters: ExecutableExecutionOptions,
        homeDir: string,
        extraConfiguration?: any,
    ): Promise<BasicExecutionResult> {
        try {
            const execOptions: ExecutionOptions = {
                maxOutput: this.maxExecOutputSize,
                timeoutMs: this.timeoutMs,
                ldPath: [...executeParameters.ldPath],
                input: executeParameters.stdin,
                customCwd: homeDir,
                appHome: homeDir,
            };

            if (this.useSanitizerEnvHints) {
                execOptions.env = {
                    ASAN_OPTIONS: 'color=always',
                    UBSAN_OPTIONS: 'color=always',
                    MSAN_OPTIONS: 'color=always',
                    LSAN_OPTIONS: 'color=always',
                    ...executeParameters.env,
                };
            } else {
                execOptions.env = {
                    ...executeParameters.env,
                };
            }

            return this.execBinaryMaybeWrapped(
                executable,
                executeParameters.args as string[],
                execOptions,
                executeParameters,
                homeDir,
            );
        } catch (err: any) {
            if (err.code && err.stderr) {
                return utils.processExecutionResult(err);
            }
            return {
                ...utils.getEmptyExecutionResult(),
                stdout: err.stdout ? utils.parseOutput(err.stdout) : [],
                stderr: err.stderr ? utils.parseOutput(err.stderr) : [],
                code: err.code === undefined ? -1 : err.code,
            };
        }
    }

    protected async execBinaryMaybeWrapped(
        executable: string,
        args: string[],
        execOptions: ExecutionOptions,
        executeParameters: ExecutableExecutionOptions,
        homeDir: string,
    ): Promise<BasicExecutionResult> {
        let runWithHeaptrack: ConfiguredRuntimeTool | undefined;
        let runWithLibSegFault: ConfiguredRuntimeTool | undefined;
        const lineParseOptions: Set<utils.LineParseOption> = new Set<utils.LineParseOption>();

        if (!execOptions.env) execOptions.env = {};

        if (executeParameters.runtimeTools) {
            LocalExecutionEnvironment.setEnvironmentVariablesFromRuntime(executeParameters.runtimeTools, execOptions);

            for (const runtime of executeParameters.runtimeTools) {
                if (runtime.name === RuntimeToolType.heaptrack) {
                    runWithHeaptrack = runtime;
                } else if (runtime.name === RuntimeToolType.libsegfault) {
                    runWithLibSegFault = runtime;
                }
            }
        }

        if (runWithLibSegFault) {
            lineParseOptions.add(utils.LineParseOption.AtFileLine);

            const libSegFaultPath = this.environment.ceProps('libSegFaultPath', '/usr/lib');
            const preloadSo = path.join(libSegFaultPath, 'libSegFault.so');
            const tracer = path.join(libSegFaultPath, 'tracer');

            if (execOptions.env.LD_PRELOAD) {
                execOptions.env.LD_PRELOAD = preloadSo + ':' + execOptions.env.LD_PRELOAD;
            } else {
                execOptions.env.LD_PRELOAD = preloadSo;
            }

            execOptions.env.LIBSEGFAULT_TRACER = tracer;

            for (const opt of runWithLibSegFault.options) {
                if (opt.name === 'registers' && opt.value === 'yes') {
                    execOptions.env.LIBSEGFAULT_REGISTERS = '1';
                } else if (opt.name === 'memory' && opt.value === 'yes') {
                    execOptions.env.LIBSEGFAULT_MEMORY = '1';
                }
            }
        }

        if (runWithHeaptrack && HeaptrackWrapper.isSupported(this.environment)) {
            lineParseOptions.add(utils.LineParseOption.AtFileLine);

            const wrapper = new HeaptrackWrapper(
                homeDir,
                exec.sandbox,
                exec.execute,
                runWithHeaptrack.options,
                this.environment.ceProps,
                this.sandboxType,
            );
            const execResult: UnprocessedExecResult = await wrapper.exec(executable, args, execOptions);
            const processed = this.processUserExecutableExecutionResult(
                execResult,
                Array.from(lineParseOptions.values()),
            );

            if (executeParameters.runtimeTools) {
                for (const runtime of executeParameters.runtimeTools) {
                    if (runtime.name === RuntimeToolType.heaptrack) {
                        await addHeaptrackResults(processed, homeDir);
                    }
                }
            }

            return processed;
        }
        const execResult: UnprocessedExecResult = await exec.sandbox(executable, args, execOptions);
        return this.processUserExecutableExecutionResult(execResult, Array.from(lineParseOptions.values()));
    }

    processUserExecutableExecutionResult(
        input: UnprocessedExecResult,
        stdErrlineParseOptions: utils.LineParseOptions,
    ): BasicExecutionResult {
        const start = performance.now();
        const stdout = utils.parseOutput(input.stdout, undefined, undefined, []);
        const stderr = utils.parseOutput(input.stderr, undefined, undefined, stdErrlineParseOptions);
        const end = performance.now();
        return {
            ...input,
            stdout,
            stderr,
            processExecutionResultTime: end - start,
        };
    }
}