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import { listen, type UnlistenFn } from "@tauri-apps/api/event";
import { create } from "zustand";
import type { ProgressEvent } from "@/types";
export type DownloadPhase =
| "idle"
| "preparing"
| "downloading"
| "finalizing"
| "installing-mod-loader"
| "completed"
| "error";
export interface DownloadState {
/** Whether a download session is active */
phase: DownloadPhase;
/** Total number of files to download */
totalFiles: number;
/** Number of files completed */
completedFiles: number;
/** Current file being downloaded */
currentFile: string;
/** Current file status */
currentFileStatus: string;
/** Bytes downloaded for current file */
currentFileDownloaded: number;
/** Total bytes for current file */
currentFileTotal: number;
/** Total bytes downloaded across all files */
totalDownloadedBytes: number;
/** Error message if any */
errorMessage: string | null;
/** Phase label for display (e.g. "Installing Fabric...") */
phaseLabel: string;
// Actions
init: () => Promise<void>;
cleanup: () => void;
reset: () => void;
setPhase: (phase: DownloadPhase, label?: string) => void;
setError: (message: string) => void;
}
let unlisteners: UnlistenFn[] = [];
let initialized = false;
// Throttle progress updates to avoid excessive re-renders.
// We buffer the latest event and flush on a timer.
let progressTimer: ReturnType<typeof setTimeout> | null = null;
let pendingProgress: ProgressEvent | null = null;
const PROGRESS_INTERVAL_MS = 50; // ~20 fps
export const useDownloadStore = create<DownloadState>((set, get) => ({
phase: "idle",
totalFiles: 0,
completedFiles: 0,
currentFile: "",
currentFileStatus: "",
currentFileDownloaded: 0,
currentFileTotal: 0,
totalDownloadedBytes: 0,
errorMessage: null,
phaseLabel: "",
init: async () => {
if (initialized) return;
initialized = true;
const flushProgress = () => {
const p = pendingProgress;
if (!p) return;
pendingProgress = null;
set({
currentFile: p.file,
currentFileStatus: p.status,
currentFileDownloaded: Number(p.downloaded),
currentFileTotal: Number(p.total),
completedFiles: p.completedFiles,
totalFiles: p.totalFiles,
totalDownloadedBytes: Number(p.totalDownloadedBytes),
});
};
const unlistenStart = await listen<number>("download-start", (e) => {
set({
phase: "downloading",
totalFiles: e.payload,
completedFiles: 0,
currentFile: "",
currentFileStatus: "",
currentFileDownloaded: 0,
currentFileTotal: 0,
totalDownloadedBytes: 0,
errorMessage: null,
phaseLabel: "Downloading files...",
});
});
const unlistenProgress = await listen<ProgressEvent>(
"download-progress",
(e) => {
pendingProgress = e.payload;
if (!progressTimer) {
progressTimer = setTimeout(() => {
progressTimer = null;
flushProgress();
}, PROGRESS_INTERVAL_MS);
}
},
);
const unlistenComplete = await listen("download-complete", () => {
// Flush any pending progress before transitioning
if (progressTimer) {
clearTimeout(progressTimer);
progressTimer = null;
}
if (pendingProgress) {
const p = pendingProgress;
pendingProgress = null;
set({
currentFile: p.file,
currentFileStatus: p.status,
currentFileDownloaded: Number(p.downloaded),
currentFileTotal: Number(p.total),
completedFiles: p.completedFiles,
totalFiles: p.totalFiles,
totalDownloadedBytes: Number(p.totalDownloadedBytes),
});
}
const { phase } = get();
// Downloads finished; move to finalizing while we wait for the
// install command to return and the caller to set the next phase.
if (phase === "downloading") {
set({
phase: "finalizing",
phaseLabel: "Finalizing installation...",
});
}
});
unlisteners = [unlistenStart, unlistenProgress, unlistenComplete];
},
cleanup: () => {
if (progressTimer) {
clearTimeout(progressTimer);
progressTimer = null;
}
pendingProgress = null;
for (const unlisten of unlisteners) {
unlisten();
}
unlisteners = [];
initialized = false;
// Reset state on cleanup to avoid residual state
set({
phase: "idle",
totalFiles: 0,
completedFiles: 0,
currentFile: "",
currentFileStatus: "",
currentFileDownloaded: 0,
currentFileTotal: 0,
totalDownloadedBytes: 0,
errorMessage: null,
phaseLabel: "",
});
},
reset: () => {
set({
phase: "idle",
totalFiles: 0,
completedFiles: 0,
currentFile: "",
currentFileStatus: "",
currentFileDownloaded: 0,
currentFileTotal: 0,
totalDownloadedBytes: 0,
errorMessage: null,
phaseLabel: "",
});
},
setPhase: (phase, label) => {
set({
phase,
phaseLabel: label ?? "",
});
},
setError: (message) => {
set({
phase: "error",
errorMessage: message,
phaseLabel: "Error",
});
},
}));
|