/**
 * This script automatically generates src/core/operations/index.mjs, containing
 * imports for all operations in src/core/operations.
 *
 * @author n1474335 [n1474335@gmail.com]
 * @copyright Crown Copyright 2018
 * @license Apache-2.0
 */

/* eslint no-console: ["off"] */

import path from "path";
import fs  from "fs";
import process from "process";

const dir = path.join(process.cwd() + "/src/core/config/");
if (!fs.existsSync(dir)) {
    console.log("\nCWD: " + process.cwd());
    console.log("Error: generateOpsIndex.mjs should be run from the project root");
    console.log("Example> node --experimental-modules src/core/config/scripts/generateOpsIndex.mjs");
    process.exit(1);
}

// Find all operation files
const opObjs = [];
fs.readdirSync(path.join(dir, "../operations")).forEach(file => {
    if (!file.endsWith(".mjs") || file === "index.mjs") return;
    opObjs.push(file.split(".mjs")[0]);
});

// Construct index file
let code = `/**
 * THIS FILE IS AUTOMATICALLY GENERATED BY src/core/config/scripts/generateOpsIndex.mjs
 *
 * @author n1474335 [n1474335@gmail.com]
 * @copyright Crown Copyright ${new Date().getUTCFullYear()}
 * @license Apache-2.0
 */
`;

opObjs.forEach(obj => {
    code += `import ${obj} from "./${obj}.mjs";\n`;
});

code += `
export {
`;

opObjs.forEach(obj => {
    code += `    ${obj},\n`;
});

code += "};\n";

// Write file
fs.writeFileSync(
    path.join(dir, "../operations/index.mjs"),
    code
);
console.log("Written operation index.");

// find all test files
const testsDir = path.join(process.cwd() + "/tests/operations/tests/");
const testObjs = [];
fs.readdirSync(testsDir).forEach(file => {
    if (!file.endsWith(".mjs")) return;
    testObjs.push(file.split(".mjs")[0]);
});

// Construct test index file
code = `/**
* THIS FILE IS AUTOMATICALLY GENERATED BY src/core/config/scripts/generateOpsIndex.mjs
*
* @author john [john19696@protonmail.com]
* @author tlwr [toby@toby.codes]
* @author n1474335 [n1474335@gmail.com]
* @copyright Crown Copyright ${new Date().getUTCFullYear()}
* @license Apache-2.0
*/

import {
    setLongTestFailure,
    logTestReport,
} from "../lib/utils.mjs";

import "../lib/wasmFetchPolyfill.mjs";

import TestRegister from "../lib/TestRegister.mjs";
`;

testObjs.forEach(obj => {
    if (obj !== "SplitColourChannels")
        code += `import "./tests/${obj}.mjs";\n`;
    else
        code += `// Cannot test operations that use the File type yet
// import "./tests/SplitColourChannels.mjs";\n`;
});

code += `

const testStatus = {
    allTestsPassing: true,
    counts: {
        total: 0,
    }
};

setLongTestFailure();

const logOpsTestReport = logTestReport.bind(null, testStatus);

(async function() {
    const results = await TestRegister.runTests();
    logOpsTestReport(results);
})();
`;

// Write tests file
fs.writeFileSync(
    path.join(testsDir, "../index.mjs"),
    code
);
console.log("Written operation tests index.");