import SwiftUI

struct DaemonLogWindowView: View {
    @Bindable var controller: DaemonController
    @State private var filterLevel: DaemonLogLine.Level? = nil
    @State private var searchText = ""
    @State private var autoscroll = true

    private var filtered: [DaemonLogLine] {
        var lines = controller.logLines
        if let lv = filterLevel { lines = lines.filter { $0.level == lv } }
        if !searchText.isEmpty { lines = lines.filter { $0.message.localizedCaseInsensitiveContains(searchText) } }
        return lines
    }

    var body: some View {
        VStack(spacing:0) {
            HStack(spacing:10) {
                ForEach(["All",nil,"info",DaemonLogLine.Level.info,"success",DaemonLogLine.Level.success,
                         "warning",DaemonLogLine.Level.warning,"error",DaemonLogLine.Level.error] as [Any], id:\.self) { _ in EmptyView() }
                HStack(spacing:4) {
                    levelBtn("All",  nil)
                    levelBtn("Info",    .info)
                    levelBtn("OK",      .success)
                    levelBtn("Warn",    .warning)
                    levelBtn("Err",     .error)
                }
                Spacer()
                HStack(spacing:4) {
                    Image(systemName:"magnifyingglass").foregroundStyle(.secondary).font(.caption)
                    TextField("Search…", text:$searchText).textFieldStyle(.roundedBorder).frame(width:160)
                }
                Toggle(isOn:$autoscroll) { Image(systemName:"arrow.down.to.line") }.toggleStyle(.button).help("Auto-scroll")
                Button { controller.clearLog() } label: { Image(systemName:"trash") }.help("Clear")
            }
            .padding(.horizontal,12).padding(.vertical,8).background(Color(NSColor.windowBackgroundColor))
            Divider()
            ScrollViewReader { proxy in
                ScrollView {
                    LazyVStack(alignment:.leading,spacing:0) {
                        ForEach(filtered) { line in
                            HStack(alignment:.top,spacing:8) {
                                Text(line.formattedTime).font(.system(.caption2,design:.monospaced)).foregroundStyle(.tertiary).frame(width:60,alignment:.leading)
                                Text(line.level.prefix).font(.caption).frame(width:16)
                                Text(line.message).font(.system(.caption,design:.monospaced)).textSelection(.enabled).frame(maxWidth:.infinity,alignment:.leading)
                            }
                            .padding(.vertical,1).padding(.horizontal,4)
                            .background(line.level == .error ? Color.red.opacity(0.06) : line.level == .warning ? Color.orange.opacity(0.06) : .clear)
                            .id(line.id)
                        }
                    }.padding(.horizontal,8).padding(.vertical,4)
                }
                .onChange(of:filtered.count) { _,_ in if autoscroll, let last = filtered.last { proxy.scrollTo(last.id,anchor:.bottom) } }
            }
        }
        .background(Color(NSColor.textBackgroundColor))
    }

    private func levelBtn(_ label: String, _ level: DaemonLogLine.Level?) -> some View {
        Button(label) { filterLevel = level }
            .buttonStyle(.bordered).controlSize(.mini)
            .tint(filterLevel == level ? .accentColor : .secondary)
    }
}