const { app, BrowserWindow, ipcMain, dialog } = require("electron");
const path = require("path");
const fs = require("fs");
const CameraParser = require("./src/main/CameraParser.js");
const QueueManager = require("./src/main/QueueManager.js");
const ConfigManager = require("./src/main/ConfigManager.js");
const UpdateManager = require("./src/main/UpdateManager.js");

let obj_main_window = null;
let obj_queue_manager = null;

const create_window = () => {
    obj_main_window = new BrowserWindow({
        width: 1400,
        height: 900,
        minWidth: 1000,
        minHeight: 700,
        webPreferences: {
            preload: path.join(__dirname, "preload.js"),
            contextIsolation: true,
            nodeIntegration: false,
        },
        title: "Multi Render Blender",
    });

    obj_main_window.loadFile(path.join(__dirname, "src", "renderer", "index.html"));

    obj_queue_manager = new QueueManager(obj_main_window);

    UpdateManager.init(obj_main_window);
    obj_main_window.webContents.on("did-finish-load", () => {
        UpdateManager.check_for_updates();
    });
};

// ── App lifecycle ──────────────────────────────────────────────

app.whenReady().then(() => {
    create_window();

    app.on("activate", () => {
        if (BrowserWindow.getAllWindows().length === 0) {
            create_window();
        }
    });
});

app.on("window-all-closed", () => {
    if (process.platform !== "darwin") {
        app.quit();
    }
});

// ── IPC Handlers ───────────────────────────────────────────────

ipcMain.handle("select-blend-file", () => {
    return dialog.showOpenDialog(obj_main_window, {
        title: "Selectionner un fichier Blender",
        filters: [
            { name: "Blender Files", extensions: ["blend"] },
        ],
        properties: ["openFile"],
    })
    .then((obj_result) => {
        if (obj_result.canceled || obj_result.filePaths.length === 0) {
            return null;
        }
        return obj_result.filePaths[0];
    });
});

ipcMain.handle("get-cameras", (event, str_blend_path) => {
    return CameraParser.list_cameras(str_blend_path);
});

ipcMain.handle("start-render", (event, obj_config) => {
    return obj_queue_manager.start(obj_config);
});

ipcMain.handle("pause-render", () => {
    return obj_queue_manager.pause();
});

ipcMain.handle("stop-render", () => {
    return obj_queue_manager.stop();
});

ipcMain.handle("save-config", (event, obj_config) => {
    return ConfigManager.save(obj_main_window, obj_config);
});

ipcMain.handle("load-config", () => {
    return ConfigManager.load(obj_main_window);
});

ipcMain.handle("read-image", (event, str_image_path) => {
    let NB_MAX_RETRIES = 10;
    let NB_RETRY_DELAY = 500;

    let fn_try_read = (nb_attempt) => {
        return new Promise((resolve, reject) => {
            if (!fs.existsSync(str_image_path)) {
                if (nb_attempt < NB_MAX_RETRIES) {
                    setTimeout(() => {
                        fn_try_read(nb_attempt + 1).then(resolve).catch(reject);
                    }, NB_RETRY_DELAY);
                    return;
                }
                reject(new Error("Fichier introuvable apres " + NB_MAX_RETRIES + " tentatives : " + str_image_path));
                return;
            }

            // Wait for file size to stabilize (file fully written)
            let nb_size_prev = -1;
            let fn_check_stable = () => {
                let obj_stats = fs.statSync(str_image_path);
                if (obj_stats.size === 0 || obj_stats.size !== nb_size_prev) {
                    nb_size_prev = obj_stats.size;
                    if (nb_attempt < NB_MAX_RETRIES) {
                        setTimeout(() => {
                            nb_attempt++;
                            fn_check_stable();
                        }, NB_RETRY_DELAY);
                        return;
                    }
                    if (obj_stats.size === 0) {
                        reject(new Error("Le fichier est vide apres " + NB_MAX_RETRIES + " tentatives : " + str_image_path));
                        return;
                    }
                }

                fs.readFile(str_image_path, (obj_err, obj_buffer) => {
                    if (obj_err) {
                        reject(new Error("Impossible de lire l'image : " + obj_err.message));
                        return;
                    }

                    let str_ext = path.extname(str_image_path).toLowerCase().replace(".", "");
                    let str_mime = "image/png";
                    if (str_ext === "jpg" || str_ext === "jpeg") {
                        str_mime = "image/jpeg";
                    } else if (str_ext === "bmp") {
                        str_mime = "image/bmp";
                    } else if (str_ext === "tiff" || str_ext === "tif") {
                        str_mime = "image/tiff";
                    } else if (str_ext === "exr") {
                        str_mime = "image/x-exr";
                    }

                    let str_base64 = obj_buffer.toString("base64");
                    resolve("data:" + str_mime + ";base64," + str_base64);
                });
            };

            fn_check_stable();
        });
    };

    return fn_try_read(0);
});

ipcMain.handle("check-for-updates", () => {
    return UpdateManager.check_for_updates();
});

ipcMain.handle("apply-update", (event, str_tag_name) => {
    return UpdateManager.download_and_apply(str_tag_name);
});

ipcMain.handle("select-output-folder", () => {
    return dialog.showOpenDialog(obj_main_window, {
        title: "Selectionner le dossier de sortie",
        properties: ["openDirectory"],
    })
    .then((obj_result) => {
        if (obj_result.canceled || obj_result.filePaths.length === 0) {
            return null;
        }
        return obj_result.filePaths[0];
    });
});