import path from "path";
import fs from "fs";
import { selectProject } from "./lib/select-project.js";
import { importSourceFactory } from "./lib/import-source.js";


const PROJECT_DIR = process.env.npm_config_local_prefix;
const HOMEBREW_DIR = path.join(PROJECT_DIR, "homebrew");

const projects = fs.readdirSync(HOMEBREW_DIR, {
    withFileTypes: true,
})
    .filter((dir) => dir.isDirectory())
    .map((dir) => dir.name);

if (projects.length === 0) {
    console.error("No homebrew projects");
    process.exit(1);
}

const project = selectProject(projects);
const SOURCE_DIR = path.join(HOMEBREW_DIR, project);
const importSource = importSourceFactory(SOURCE_DIR);

const meta = importSource("meta.json");
meta._meta.dateLastModified = parseInt((Date.now()/1000).toString());

const sources = fs.readdirSync(SOURCE_DIR, {
    withFileTypes: true,
})
    .filter((source) => source.isFile() && source.name.endsWith(".json") && source.name !== "meta.json")
    .map((source) => source.name);


const homebrew = sources.reduce((result, source) => {
    const sourceData = importSource(source);
    delete sourceData._meta;

    Object.entries(sourceData).forEach(([sourceKey, sourceValue]) => {
        if (!(sourceKey in result)) {
            
            result[sourceKey] = sourceValue;
            return;
        }
        if (Array.isArray(result[sourceKey])) {
            result[sourceKey] = result[sourceKey].concat(sourceValue);
            return;
        }
        throw new Error(`Could not merge non-array key ${sourceKey}`);
    });

    return result;
}, meta);

const outFile = path.join(HOMEBREW_DIR, `${project}.json`);
if (fs.existsSync(outFile)) {
    fs.unlinkSync(outFile);
}

fs.writeFileSync(outFile, JSON.stringify(homebrew, null, "\t"), { encoding: "utf-8"});