const { ScreepsAPI } = require('screeps-api');
const core = require("@actions/core");
const fs = require('fs');
const glob = require('glob');
const path = require('path');

/**
 * Reads files matching a glob pattern into a dictionary.
 * @param {string} pattern - Glob pattern to match files.
 * @param {string} prefix - Directory prefix for file paths.
 * @returns {Promise<Object>} - Promise resolving to a dictionary of file contents keyed by filenames.
 */
function readFilesIntoDict(pattern, prefix) {
    // Prepend the prefix to the glob pattern
    const globPattern = prefix ? path.join(prefix, pattern) : pattern;

    return new Promise((resolve, reject) => {
        glob(globPattern, (err, files) => {
            if (err) {
                return reject(err);
            }

            let fileDict = {};
            let readPromises = [];

            files.forEach(file => {
                let readPromise = fs.promises.readFile(file, 'utf8')
                    .then(content => {
                        // Remove the prefix from the filename and drop the file suffix
                        let key = file;
                        if (prefix && file.startsWith(prefix)) {
                            key = key.slice(prefix.length);
                        }
                        key = path.basename(key, path.extname(key)); // Drop the file suffix

                        fileDict[key] = content;
                    });

                readPromises.push(readPromise);
            });

            // Use Promise.all to ensure all files are read before resolving
            Promise.all(readPromises)
                .then(() => resolve(fileDict))
                .catch(reject);
        });
    });
}

/**
 * Validates the provided authentication credentials.
 * @param {string} token - The authentication token.
 * @param {string} username - The username.
 * @param {string} password - The password.
 * @returns {string|null} - Returns an error message if validation fails, otherwise null.
 */
function validateAuthentication(token, username, password) {
    if (token) {
        if (username || password) {
            return "Token is defined along with username and/or password.";
        }
    } else {
        if (!username && !password) {
            return "Neither token nor password and username are defined.";
        }
        if (username && !password) {
            return "Username is defined but no password is provided.";
        }
        if (!username && password) {
            return "Password is defined but no username is provided.";
        }
    }
    return null; // No errors found
}

/**
 * Posts code to Screeps server.
 */
async function postCode() {
    const protocol = core.getInput("protocol") || "https";
    const hostname = core.getInput("hostname") || "screeps.com";
    const port = core.getInput("port") || "443";
    const path = core.getInput("path") || "/";

    const token = core.getInput("token") || undefined;
    const username = core.getInput("username") || undefined;
    const password = core.getInput("password") || undefined;
    const prefix = core.getInput("source-prefix");
    const pattern = core.getInput("pattern") || "*.js";
    const branch = core.getInput("branch") || "default";
    
    const files_to_push = await readFilesIntoDict(pattern, prefix);
    
    Object.keys(files_to_push).forEach(key => {
        core.info(`Key: ${key}`);
    });
    
    core.info(files_to_push);

    const login_arguments = {
        "token": token,
        "username": username,
        "password": password,
        "protocol": protocol,
        "hostname": hostname,
        "port": port,
        "path": path,
    };

    Object.keys(login_arguments).forEach(key => {
        core.info(`Key: ${key}`);
    });

    const errorMessage = validateAuthentication(token, username, password);
    if (errorMessage) {
        core.error(errorMessage);
        return;
    }

    core.info(JSON.stringify(login_arguments, null, 2));

    const api = new ScreepsAPI(login_arguments);
    core.info(`Pushing to branch ${branch}`)
    const response = await api.code.set(branch, files_to_push);
    core.info(JSON.stringify(response, null, 2));
    core.info(JSON.stringify(response.json, null, 2));
}

postCode();