#!/usr/bin/env -S deno run -A

import { parse } from "jsr:@std/yaml";
import {
    existsPath,
    exit,
    joinPath,
    log,
    readFileToString,
    writeStringToFile,
} from "../libraries/deno-commons-mod.ts";

async function main(): Promise<void> {
    const dirs = Deno.readDir(".");
    const metas: CheatSheetMeta[] = [];
    for await (const dirEntry of dirs) {
        if (dirEntry.isDirectory) {
            log.debug(dirEntry.name);
            const cheatSheetMdFile = joinPath(dirEntry.name, "CHEATSHEET.md");
            if (!await existsPath(cheatSheetMdFile)) {
                log.debug(`Cheat sheet md not exists: ${cheatSheetMdFile}`);
                continue;
            }
            const cheatSheetMd = await readFileToString(cheatSheetMdFile);
            try {
                const cheatSheetMeta = parseCheatSheetMeta(cheatSheetMd);
                metas.push(cheatSheetMeta);
            } catch (e) {
                log.error(
                    `Parse cheat sheet md: ${cheatSheetMdFile} failed: ${e}`,
                );
            }
        }
    }
    metas.sort((m1, m2) => {
        return m1.name.localeCompare(m2.name);
    });

    await writeStringToFile("meta.json", JSON.stringify(metas, null, 4));
}

interface CheatSheetMeta {
    name: string;
    aliases?: Array<string>;
    repo?: string;
    description?: string;
}

function parseCheatSheetMeta(cheatSheetMd: string): CheatSheetMeta {
    const yaml = findMetaYaml(cheatSheetMd);
    let meta = parse(yaml);
    return meta as CheatSheetMeta;
}

function findMetaYaml(cheatSheetMd: string): string {
    const lines = cheatSheetMd.split(/\r?\n/);
    let yaml = [];
    let inMeta = false;
    let inYaml = false;
    for (const line of lines) {
        if (inMeta) {
            if (inYaml) {
                if (line.startsWith("```")) {
                    inYaml = false;
                    return yaml.join("\n");
                } else {
                    yaml.push(line);
                }
            } else {
                if (/^```\s*yaml\s*$/i.test(line)) {
                    inYaml = true;
                }
            }
        } else {
            if (/^\s*([#]+)\s*meta\s*$/i.test(line)) {
                inMeta = true;
            }
        }
    }
    throw new Error("Parse cheat sheet md meta failed");
}

main().catch((err) => {
    log.error(err);
    exit(1);
}).then(() => exit(0));