//
//  DownloadTask.swift
//  Zyquo Local
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//

import Foundation

/// State of one model download managed by `DownloadManager` (Phase 3).
struct DownloadTask: Identifiable, Codable, Hashable, Sendable {
    enum State: String, Codable, Sendable {
        case queued
        case downloading
        case paused
        case verifying
        case completed
        case failed
        case cancelled
    }

    /// Progress of a single file inside the download.
    struct FileProgress: Codable, Hashable, Sendable {
        var path: String
        var totalBytes: Int64
        var receivedBytes: Int64
        /// LFS sha256 (from x-linked-etag) when available, for integrity checks.
        var sha256: String?
        var completed: Bool
    }

    var repoID: String
    var state: State
    var files: [FileProgress]
    var errorDescription: String?
    var startedAt: Date

    var id: String { repoID }

    var totalBytes: Int64 { files.reduce(0) { $0 + $1.totalBytes } }
    var receivedBytes: Int64 { files.reduce(0) { $0 + $1.receivedBytes } }

    var fractionCompleted: Double {
        let total = totalBytes
        guard total > 0 else { return 0 }
        return Double(receivedBytes) / Double(total)
    }
}