const { dialog } = require('electron');
const path       = require('node:path');
const express    = require('express');
const bodyParser = require('body-parser');
const http       = require('http');
const socketIO   = require('socket.io');
const fetch      = require('electron-fetch').default
const fs         = require('node:fs');
const os         = require('os');
const chokidar   = require('chokidar');


const HOME_DIR              = os.homedir();
const BASE_PATH             = '../build/app';
const CONFIG_PATH           = path.join(HOME_DIR, "/.config/newton/");
const SETTINGS_CONFIG_PATH  = path.join(CONFIG_PATH, "/settings.json");
const LSP_CONFIG_PATH       = path.join(BASE_PATH, "/resources/lsp-servers-config.json");
const IPC_SERVER_IP         = "127.0.0.1";
let window                  = null;
let watcher                 = null;
let ipcServer               = null;
let ipcServerPort           = "4563";
let ipcServerURL            = `http://${IPC_SERVER_IP}:${ipcServerPort}`;


const getIconPath = () => {
    return path.join(CONFIG_PATH, "./icons/newton.png");
}

const getSettingsConfigData = () => {
    return getFileContents(SETTINGS_CONFIG_PATH);
}

const getLspConfigData = () => {
    const config = getFileContents(LSP_CONFIG_PATH, useRelativePath = true);
    return config.replaceAll("{user.home}", HOME_DIR);
}

const getFileContents = (_path, useRelativePath = false) => {
    console.log(`Getting Contents For: ${_path}`);

    try {
        if (!useRelativePath) {
            return fs.readFileSync(_path, 'utf8');
        } else {
            let fpath = path.join(__dirname, _path);
            watcher.add(fpath);
            return fs.readFileSync(fpath, 'utf8');
        }
    } catch(err) {
        return `{"message": {"type": "error", "text": "Error: Could not read  ${_path}"}}`;
    }
}

const setWindow = (win) => {
        window = win;
}

const saveFile = (fpath, content)  => {
    fs.writeFile(fpath, content, (err) => {
        if (!err) return
        console.error("An error ocurred writing to the file " + err.message);
    });
}

const saveFileAs = (content) => {
    dialog.showSaveDialog().then((response) => {
        if (response.canceled) {
            console.log("You didn't save the file");
            return;
        }

        saveFile(response.filePath, content);
        watcher.add(response.filePath);
    });
}

const openFiles = (startPath) => {
    dialog.showOpenDialog(
        {
            title: "Open File(s):",
            defaultPath: (startPath) ? startPath : HOME_DIR,
            filters: [
                { name: "All Files", extensions: ["*"]                               },
                { name: "c",         extensions: [".h", ".c"]                        },
                { name: "cpp",       extensions: ["hpp", "cpp"]                      },
                { name: "html",      extensions: ["js", "css", "scss", "html", "ts"] },
                { name: "java",      extensions: ["java"]                            },
                { name: "python",    extensions: ["py", "pyc"]                       },
                { name: "rust",      extensions: ["r", "rc"]                         },
                { name: "text",      extensions: ["txt", "log", "md"]                },
                { name: "go",        extensions: ["go"]                              },
            ],
            properties: [
                'openFile',
                'multiSelections'
            ]
        }
    ).then((response) => {
        if (response.canceled) {
            console.log("Canceled file open request...");
            return;
        }

        window.webContents.send('load-files', response.filePaths);
        watcher.add(response.filePaths);
    });
}

const loadFilesWatcher = () => {
    watcher = chokidar.watch([], {});

    watcher.on('change', (fpath) => {
        console.debug("File (changed) : ", fpath);
    }).on('unlink', (fpath) => {
        console.debug("File (unlinked) : ", fpath);
    });
}

const unwatchFile = async (fpath) => {
    console.log("File (unwatch) : ", fpath);
    await watcher.unwatch(fpath);
}

const closeFile = (fpath) => {
    unwatchFile(fpath);
}

const loadIPCServer = (fpath) => {

    const app = express();
    ipcServer = http.createServer(app);
    const io  = socketIO(ipcServer);

    app.use(bodyParser.json());
    app.use(
        bodyParser.urlencoded({
            extended: true,
        }),
    );

    app.get("/is-up", (req, res) => {
        res.status(200).send('yes');
    });

    app.post("/load-files", (req, res) => {
        console.debug("Load File(s) : ", req.body);

        window.webContents.send('load-files', req.body);
        res.status(200).send('');
    });

    ipcServer.listen(ipcServerPort, () => {
        console.debug(`IPCServer is up on port ${ipcServerPort}`);
    });

}

const isIPCServerUp = async () => {
    const response = await fetch(`${ipcServerURL}/is-up`).catch((err) => {
        console.debug(err);
        return {
            text: () => {
                return "no";
            }
        }
    });

    const body = await response.text();
    return (body == "yes") ? true : false;
}

const sendFilesToIPC = async (files) => {
    let request = {
        method: "POST",
        body: JSON.stringify(files),
        headers: { 'Content-Type': 'application/json' }
    };

    await fetch(`${ipcServerURL}/load-files`, request);
}



module.exports = {
    newtonFs: {
        openFiles: openFiles,
        saveFile: saveFile,
        saveFileAs: saveFileAs,
        closeFile: closeFile,
        getIconPath: getIconPath,
        getFileContents: getFileContents,
        getLspConfigData: getLspConfigData,
        getSettingsConfigData: getSettingsConfigData,
        loadIPCServer: loadIPCServer,
        isIPCServerUp: isIPCServerUp,
        sendFilesToIPC: sendFilesToIPC,
        setWindow: setWindow,
        loadFilesWatcher: loadFilesWatcher,
        unwatchFile: unwatchFile,
    }
};