import SwiftUI

struct OrbView: View {
    enum OrbState {
        case idle
        case connecting
        case listening
        case speaking
        case thinking
        case failed
    }

    let state: OrbState

    @State private var animating = false

    private var baseColor: Color {
        switch state {
        case .idle, .connecting: .blue
        case .listening: .green
        case .speaking, .thinking: .orange
        case .failed: .red
        }
    }

    private var scale: CGFloat {
        switch state {
        case .connecting, .listening, .speaking, .thinking: 1.1
        default: 1.0
        }
    }

    private var label: String {
        switch state {
        case .idle: "Idle"
        case .connecting: "Connecting"
        case .listening: "Listening"
        case .speaking: "Speaking"
        case .thinking: "Thinking"
        case .failed: "Connection failed"
        }
    }

    var body: some View {
        let shape = Circle()
            .fill(baseColor.gradient)
            .frame(width: 120, height: 120)
        let animated = shape
            .scaleEffect(animating ? scale : 0.95)
            .opacity(state == .idle || state == .failed ? 0.7 : 1.0)
        let anim: Animation? = state == .idle || state == .failed
            ? nil
            : .easeInOut(duration: 0.8).repeatForever(autoreverses: true)
        animated
            .animation(anim, value: animating)
            .onAppear { animating = true }
            .onChange(of: state) { _, _ in animating = true }
            .accessibilityElement()
            .accessibilityLabel("Conversation status")
            .accessibilityValue(label)
    }
}

struct TranscriptListView: View {
    let events: [TranscriptEvent]
    @ObservedObject var history: TranscriptHistory
    var onClear: () -> Void

    private static let deliveryMarkers = #"\[(?:appreciative|calm|concerned|curious|encouraging|excited|happy|joking|quiet|reassuring|reflective|sad|serious|surprised|sympathetic|urgent|whispering|laughter|sighing|breathing|neutral)\]\s*"#

    private static let timestampFormatter: DateFormatter = {
        let formatter = DateFormatter()
        formatter.dateStyle = .none
        formatter.timeStyle = .short
        return formatter
    }()

    var body: some View {
        ScrollViewReader { proxy in
            VStack(alignment: .leading, spacing: 0) {
                HStack {
                    Text("Transcript")
                        .font(.caption.bold())
                        .foregroundStyle(.secondary)
                    Spacer()
                    Button(role: .destructive, action: onClear) {
                        Label("Clear", systemImage: "trash")
                            .font(.caption)
                    }
                }
                .padding(.horizontal)
                .padding(.bottom, 4)

                ScrollView {
                    LazyVStack(alignment: .leading, spacing: 8) {
                        ForEach(events) { event in
                            transcriptRow(event)
                        }
                    }
                    .padding(.horizontal)
                }
                .onChange(of: events.count) { _, count in
                    if let last = events.last {
                        withAnimation { proxy.scrollTo(last.id, anchor: .bottom) }
                    }
                }
            }
        }
    }

    private func transcriptRow(_ event: TranscriptEvent) -> some View {
        let roleName = event.role == .user ? "You" : "Hope"
        let nameColor: Color = event.role == .user ? .secondary : .blue
        let rowBackground: Color = event.role == .user
            ? Color(.secondarySystemBackground)
            : Color.blue.opacity(0.08)
        let textOpacity: Double = event.isFinal ? 1.0 : 0.55
        return VStack(alignment: .leading, spacing: 2) {
            HStack {
                Text(roleName)
                    .font(.caption2.bold())
                    .foregroundStyle(nameColor)
                Spacer()
                Text(Self.timestampFormatter.string(from: event.timestamp))
                    .font(.caption2)
                    .foregroundStyle(.tertiary)
            }
            Text(stripped(event.text))
                .font(.body)
                .opacity(textOpacity)
        }
        .frame(maxWidth: .infinity, alignment: .leading)
        .padding(8)
        .background(rowBackground)
        .cornerRadius(10)
        .id(event.id)
    }

    private func stripped(_ text: String) -> String {
        text.replacingOccurrences(
            of: Self.deliveryMarkers,
            with: "",
            options: .regularExpression
        ).trimmingCharacters(in: .whitespaces)
    }
}