//
//  DownloadsPopover.swift
//  Zyquo Atlas
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//
//  Toolbar downloads popover: in-flight and finished downloads with progress,
//  reveal-in-Finder, and open. Backed by the window's DownloadManager.
//

import SwiftUI

struct DownloadsPopover: View {
    @ObservedObject var downloads: DownloadManager
    let onClose: () -> Void
    @EnvironmentObject private var themeEngine: ThemeEngine
    private var theme: AtlasTheme { themeEngine.theme }

    var body: some View {
        VStack(alignment: .leading, spacing: 0) {
            HStack {
                Text("Downloads").font(ZyquoFont.bodyEmphasis()).foregroundStyle(theme.textPrimary)
                Spacer()
                if downloads.items.contains(where: { $0.state == .finished }) {
                    Button("Clear") { downloads.clearFinished() }
                        .font(ZyquoFont.caption).foregroundStyle(theme.accent)
                }
                Button { onClose() } label: { Image(systemName: "xmark") }
                    .buttonStyle(.plain).foregroundStyle(theme.textTertiary)
            }
            .padding(ZyquoSpacing.sm)
            Divider().overlay(theme.border)

            if downloads.items.isEmpty {
                Text("No downloads yet")
                    .font(ZyquoFont.caption).foregroundStyle(theme.textTertiary)
                    .frame(maxWidth: .infinity).padding(ZyquoSpacing.lg)
            } else {
                ScrollView {
                    VStack(spacing: 0) {
                        ForEach(downloads.items) { item in
                            row(item)
                            Divider().overlay(theme.border)
                        }
                    }
                }
                .frame(maxHeight: 320)
            }
        }
        .frame(width: 320)
        .background(RoundedRectangle(cornerRadius: ZyquoRadius.large).fill(theme.surface))
        .overlay(RoundedRectangle(cornerRadius: ZyquoRadius.large).strokeBorder(theme.border, lineWidth: ZyquoMetrics.hairline))
        .shadow(color: ZyquoShadow.soft.color, radius: ZyquoShadow.soft.radius, y: ZyquoShadow.soft.y)
    }

    private func row(_ item: DownloadItem) -> some View {
        HStack(spacing: ZyquoSpacing.sm) {
            Image(systemName: icon(item)).foregroundStyle(color(item))
            VStack(alignment: .leading, spacing: 2) {
                Text(item.filename).font(ZyquoFont.body(size: 12)).lineLimit(1)
                    .foregroundStyle(theme.textPrimary)
                if item.state == .inProgress {
                    ProgressView(value: item.fraction).controlSize(.small).tint(theme.accent)
                } else {
                    Text(item.state == .finished ? "Completed" : "Failed")
                        .font(ZyquoFont.caption).foregroundStyle(theme.textTertiary)
                }
            }
            Spacer()
            if item.state == .finished {
                Button { downloads.open(item) } label: { Image(systemName: "arrow.up.forward.app") }
                    .buttonStyle(.plain).foregroundStyle(theme.textSecondary)
                Button { downloads.reveal(item) } label: { Image(systemName: "magnifyingglass") }
                    .buttonStyle(.plain).foregroundStyle(theme.textSecondary)
            }
        }
        .padding(ZyquoSpacing.sm)
    }

    private func icon(_ i: DownloadItem) -> String {
        switch i.state { case .inProgress: return "arrow.down.circle"
        case .finished: return "checkmark.circle.fill"; case .failed: return "exclamationmark.circle.fill" }
    }
    private func color(_ i: DownloadItem) -> Color {
        switch i.state { case .inProgress: return theme.accent
        case .finished: return theme.success; case .failed: return theme.danger }
    }
}