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import path from 'path';

import type {CompilationResult, ExecutionOptions} from '../../types/compilation/compilation.interfaces.js';
import {LLVMIrBackendOptions} from '../../types/compilation/ir.interfaces.js';
import type {ParseFiltersAndOutputOptions} from '../../types/features/filters.interfaces.js';
import {unwrap} from '../assert.js';
import {BaseCompiler} from '../base-compiler.js';

export class PonyCompiler extends BaseCompiler {
    static get key() {
        return 'pony';
    }

    constructor(info: any, env: any) {
        super(info, env);

        this.compiler.supportsIrView = true;
        this.compiler.irArg = ['--pass', 'ir'];
    }

    override optionsForFilter(filters: ParseFiltersAndOutputOptions, outputFilename: any, userOptions?: any): string[] {
        let options = ['-b', path.parse(outputFilename).name];

        if (!filters.binary) {
            options = options.concat(['--pass', 'asm']);
        }

        return options;
    }

    override preProcess(source: string, filters: any) {
        // I do not think you can make a Pony "library", so you must always have a main.
        // Looking at the stdlib, the main is used as a test harness.
        if (!this.stubRe.test(source)) {
            source += `\n${this.stubText}\n`;
        }
        return source;
    }

    override async generateIR(
        inputFilename: string,
        options: string[],
        irOptions: LLVMIrBackendOptions,
        produceCfg: boolean,
        filters: ParseFiltersAndOutputOptions,
    ) {
        const newOptions = options
            .filter(option => !['--pass', 'asm', '-b', this.outputFilebase].includes(option))
            .concat(unwrap(this.compiler.irArg))
            .concat(['-b', path.parse(inputFilename).name]);

        const execOptions = this.getDefaultExecOptions();
        // A higher max output is needed for when the user includes headers
        execOptions.maxOutput = 1024 * 1024 * 1024;

        const output = await this.runCompiler(this.compiler.exe, newOptions, this.filename(inputFilename), execOptions);
        if (output.code !== 0) {
            return {
                asm: [{text: 'Failed to run compiler to get IR code'}],
            };
        }
        const ir = await this.processIrOutput(output, irOptions, filters);
        return {
            asm: ir.asm,
        };
    }

    override async runCompiler(
        compiler: string,
        options: string[],
        inputFilename: string,
        execOptions: ExecutionOptions & {env: Record<string, string>},
    ): Promise<CompilationResult> {
        if (!execOptions) {
            execOptions = this.getDefaultExecOptions();
        }

        if (!execOptions.customCwd) {
            execOptions.customCwd = path.dirname(inputFilename);
        }

        // Pony operates upon the directory as a whole, not files it seems
        // So we must set the input to the directory rather than a file.
        options = options.map(arg => (arg.includes(inputFilename) ? path.dirname(arg) : arg));

        const compilerExecResult = await this.exec(compiler, options, execOptions);
        return this.transformToCompilationResult(compilerExecResult, inputFilename);
    }
}