// Copyright (c) 2022, Compiler Explorer Authors
// All rights reserved.
//
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//     * Redistributions of source code must retain the above copyright notice,
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// 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
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import path from 'node:path';

import {CompilationInfo, ExecutionOptions} from '../../types/compilation/compilation.interfaces.js';
import {BaseTool} from './base-tool.js';

export class LLVMCovTool extends BaseTool {
    static get key() {
        return 'llvm-cov-tool';
    }

    override async runTool(compilationInfo: CompilationInfo, inputFilepath: string, args: string[], stdin?: string) {
        const compilationExecOptions = this.getDefaultExecOptions();
        compilationExecOptions.customCwd = path.dirname(inputFilepath);
        compilationExecOptions.input = stdin;
        try {
            const generatedExecutableName = this.getUniqueFilePrefix() + '-coverage.a';

            let skipNext = false;
            const options: string[] = [];
            const withoutInputFile = (compilationInfo.compilationOptions || []).filter(
                v => !v.includes(inputFilepath) && v !== '-S' && !v.startsWith('-O'),
            );
            for (const v of withoutInputFile) {
                if (v === '-o') {
                    skipNext = true;
                    continue;
                }

                if (skipNext) {
                    skipNext = false;
                    continue;
                }

                options.push(v);
            }

            const compilationArgs = [
                ...options,
                '-fprofile-instr-generate',
                '-fcoverage-mapping',
                '-g',
                '-O0',
                inputFilepath,
                '-o',
                generatedExecutableName,
            ];

            const compilerPath = path.dirname(compilationInfo.compiler.exe);

            const compilationResult = await this.exec(
                compilationInfo.compiler.exe,
                compilationArgs,
                compilationExecOptions,
            );

            if (compilationResult.code !== 0) {
                return this.createErrorResponse(
                    `<Compilation error>\n${compilationResult.stdout}\n${compilationResult.stderr}`,
                );
            }

            const runExecOptions = this.getDefaultExecOptions() as ExecutionOptions;
            runExecOptions.customCwd = path.dirname(inputFilepath);

            await this.exec('./' + generatedExecutableName, [], {
                ...runExecOptions,
                input: stdin,
            });

            const profdataPath = path.join(compilerPath, 'llvm-profdata');

            const generatedProfdataName = this.getUniqueFilePrefix() + '.profdata';
            const profdataResult = await this.exec(
                profdataPath,
                ['merge', '-sparse', './default.profraw', '-o', './' + generatedProfdataName],
                runExecOptions,
            );
            if (profdataResult.code !== 0) {
                return this.createErrorResponse(
                    `<llvm-profdata error>\n${profdataResult.stdout}\n${profdataResult.stderr}`,
                );
            }

            const covResult = await this.exec(
                path.join(compilerPath, 'llvm-cov'),
                [
                    'show',
                    './' + generatedExecutableName,
                    '-instr-profile=./' + generatedProfdataName,
                    '-format',
                    'text',
                    '-use-color',
                    '-compilation-dir=./',
                    ...args,
                ],
                runExecOptions,
            );
            if (covResult.code === 0) {
                return this.convertResult(covResult, inputFilepath, path.dirname(this.tool.exe));
            }
            return this.createErrorResponse(`<llvm-cov error>\n${covResult.stdout}\n${covResult.stderr}`);
        } catch (e) {
            return this.createErrorResponse(`<Tool error: ${e}>`);
        }
    }
}
