import { readdir, readFile } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";

const scriptDirectory = path.dirname(fileURLToPath(import.meta.url));
const repoRoot = path.resolve(scriptDirectory, "..");

const directoriesToScan = [
    path.join(repoRoot, "RpgRoller", "frontend"),
    path.join(repoRoot, "RpgRoller", "wwwroot"),
    path.join(repoRoot, "openapi")
];

const filesToScan = [
    path.join(repoRoot, "package.json"),
    path.join(repoRoot, "tsconfig.frontend.json"),
    path.join(repoRoot, "scripts", "generate-api-client.mjs"),
    path.join(repoRoot, "scripts", "lint-frontend.mjs"),
    path.join(repoRoot, "scripts", "format-check.mjs")
];

async function collectFiles(directory) {
    const entries = await readdir(directory, { withFileTypes: true });
    const results = [];
    for (const entry of entries) {
        const fullPath = path.join(directory, entry.name);
        if (entry.isDirectory()) {
            const children = await collectFiles(fullPath);
            results.push(...children);
        }
        else {
            results.push(fullPath);
        }
    }

    return results;
}

const allFiles = [...filesToScan];
for (const directory of directoriesToScan) {
    const directoryFiles = await collectFiles(directory);
    allFiles.push(...directoryFiles);
}

const failures = [];
for (const filePath of allFiles) {
    const text = await readFile(filePath, "utf8");
    const relativePath = path.relative(repoRoot, filePath);
    const lines = text.split(/\r?\n/);

    for (let lineNumber = 0; lineNumber < lines.length; lineNumber += 1) {
        if (/[ \t]+$/.test(lines[lineNumber])) {
            failures.push(`${relativePath}:${lineNumber + 1} has trailing whitespace.`);
        }
    }

    if (text.includes("\t")) {
        failures.push(`${relativePath} contains tab characters.`);
    }

    if (text.length > 0 && !text.endsWith("\n") && !text.endsWith("\r\n")) {
        failures.push(`${relativePath} is missing a trailing newline.`);
    }
}

if (failures.length > 0) {
    throw new Error(failures.join("\n"));
}

console.log("Frontend format checks passed.");