const core = require("@actions/core");


function parseVersion(str){
    if (typeof(str) != 'string') { return false; }

    var arr = str.split('.');

    // parse int or default to 0
    var maj = parseInt(arr[0]) || 0;
    var min = parseInt(arr[1]) || 0;
    var patch = parseInt(arr[2]) || 0;
    return {
        major: maj,
        minor: min,
        patch: patch
    }
}


async function increaseVersionPart(url_pattern, version, version_part) {
    let test_vor_existence = version;
    while (true) {
        const url_with_version =  url_pattern.replace(/{{VERSION}}/g, test_vor_existence);
        if (url_with_version == url_pattern) {
            throw new Error('The url does not contain an {{VERSION}} marker!');
        }
        let status = await fetch(url_with_version, {
            method: "GET",
          }).then((response) => response.status);
        if (status === 200) {
            version = test_vor_existence;
            const version_parsed = parseVersion(test_vor_existence)
            if (version_part == "minor") {
                test_vor_existence = `${version_parsed.major}.${version_parsed.minor + 1}.0`;
            } else if (version_part == "micro") {
                test_vor_existence = `${version_parsed.major}.${version_parsed.minor}.${version_parsed.patch + 1}`;
            } else {
                throw new Error('The url does not contain an {{VERSION}} marker!');
            }
        } else {
            return version
        }
    }
}

async function increaseVersion(url_pattern, version) {
    let minor = await increaseVersionPart(url_pattern, version, version_part="minor");
    return await increaseVersionPart(url_pattern, minor, version_part="micro");
}

async function main(){
    try {
        const url_pattern = core.getInput("url-pattern");
        const start_version = core.getInput("start-version");
        const current_version = await increaseVersion(url_pattern, start_version);
        core.info(`The new version determend is ${current_version}`);
        core.setOutput('max_version', current_version);
        return current_version;
    } catch (error) {
        core.setFailed(`Action failed with error: ${error}`);
    }
}

main();