import ActivityKit
import SwiftUI
import WidgetKit

// Mantine v8 avatar tint colors (shade-6) — exact hex values, desktop parity
private let mantineTints: [Color] = [
    Color(red: 34/255,  green: 139/255, blue: 230/255), // #228be6 blue
    Color(red: 21/255,  green: 170/255, blue: 191/255), // #15aabf cyan
    Color(red: 190/255, green: 75/255,  blue: 219/255), // #be4bdb grape
    Color(red: 64/255,  green: 192/255, blue: 87/255),  // #40c057 green
    Color(red: 76/255,  green: 110/255, blue: 245/255), // #4c6ef5 indigo
    Color(red: 130/255, green: 201/255, blue: 30/255),  // #82c91e lime
    Color(red: 253/255, green: 126/255, blue: 20/255),  // #fd7e14 orange
    Color(red: 230/255, green: 73/255,  blue: 128/255), // #e64980 pink
    Color(red: 250/255, green: 82/255,  blue: 82/255),  // #fa5252 red
    Color(red: 18/255,  green: 184/255, blue: 134/255), // #12b886 teal
    Color(red: 121/255, green: 80/255,  blue: 242/255), // #7950f2 violet
]

private let appGroupID = "group.com.rosetta.dev"

@main
struct CallLiveActivity: Widget {
    var body: some WidgetConfiguration {
        ActivityConfiguration(for: CallActivityAttributes.self) { context in
            // MARK: - Lock Screen
            HStack(spacing: 14) {
                avatarView(context: context, size: 48, fontSize: 18)

                VStack(alignment: .leading, spacing: 3) {
                    Text(context.attributes.peerName)
                        .font(.system(size: 17, weight: .semibold))
                        .foregroundColor(.white)
                        .lineLimit(1)

                    HStack(spacing: 6) {
                        Image(systemName: "lock.fill")
                            .font(.system(size: 10))
                            .foregroundColor(Color(white: 0.45))

                        if context.state.isActive {
                            Text(fmt(context.state.durationSec))
                                .font(.system(size: 14, weight: .medium).monospacedDigit())
                                .foregroundColor(Color(white: 0.55))
                        } else {
                            Text("Connecting...")
                                .font(.system(size: 14, weight: .medium))
                                .foregroundColor(Color(white: 0.55))
                        }

                        if context.state.isMuted {
                            Image(systemName: "mic.slash.fill")
                                .font(.system(size: 11))
                                .foregroundColor(.red)
                        }
                    }
                }
                Spacer()
                ZStack {
                    Circle().fill(Color.red)
                    Image(systemName: "phone.down.fill")
                        .font(.system(size: 15, weight: .semibold))
                        .foregroundColor(.white)
                }
                .frame(width: 40, height: 40)
            }
            .padding(.horizontal, 20)
            .padding(.vertical, 14)
            .activityBackgroundTint(Color(white: 0.08))

        } dynamicIsland: { context in
            DynamicIsland {
                // MARK: - Expanded
                DynamicIslandExpandedRegion(.leading) {
                    avatarView(context: context, size: 44, fontSize: 15)
                        .padding(.leading, 6)
                        .padding(.top, 4)
                }
                DynamicIslandExpandedRegion(.trailing) {
                    VStack(spacing: 2) {
                        if context.state.isActive {
                            Text(fmt(context.state.durationSec))
                                .font(.system(size: 16, weight: .bold).monospacedDigit())
                                .foregroundColor(.green)
                        } else {
                            Text("...")
                                .font(.system(size: 16, weight: .bold))
                                .foregroundColor(.orange)
                        }
                        if context.state.isMuted {
                            Image(systemName: "mic.slash.fill")
                                .font(.system(size: 11))
                                .foregroundColor(.red)
                        }
                    }
                    .padding(.trailing, 6)
                    .padding(.top, 4)
                }
                DynamicIslandExpandedRegion(.center) {
                    Text(context.attributes.peerName)
                        .font(.system(size: 16, weight: .semibold))
                        .foregroundColor(.white)
                        .lineLimit(1)
                        .padding(.top, 4)
                }
                DynamicIslandExpandedRegion(.bottom) {
                    HStack(spacing: 5) {
                        Circle()
                            .fill(context.state.isActive ? Color.green : Color.orange)
                            .frame(width: 6, height: 6)
                        Image(systemName: "lock.fill")
                            .font(.system(size: 9))
                            .foregroundColor(Color(white: 0.4))
                        Text("Rosetta · E2E encrypted")
                            .font(.system(size: 11, weight: .medium))
                            .foregroundColor(Color(white: 0.4))
                    }
                    .padding(.top, 4)
                }
            } compactLeading: {
                avatarView(context: context, size: 26, fontSize: 10)
            } compactTrailing: {
                if context.state.isActive {
                    Text(fmt(context.state.durationSec))
                        .font(.system(size: 13, weight: .semibold).monospacedDigit())
                        .foregroundColor(.green)
                } else {
                    Image(systemName: "phone.fill")
                        .font(.system(size: 12))
                        .foregroundColor(.green)
                }
            } minimal: {
                Image(systemName: "phone.fill")
                    .font(.system(size: 11))
                    .foregroundColor(.green)
            }
        }
    }

    // MARK: - Avatar

    @ViewBuilder
    private func avatarView(context: ActivityViewContext<CallActivityAttributes>, size: CGFloat, fontSize: CGFloat) -> some View {
        if let img = loadSharedAvatar() {
            Image(uiImage: img)
                .resizable()
                .scaledToFill()
                .frame(width: size, height: size)
                .clipShape(Circle())
        } else {
            let idx = min(context.attributes.colorIndex, mantineTints.count - 1)
            ZStack {
                Circle().fill(mantineTints[max(0, idx)])
                Text(makeInitials(context.attributes.peerName, context.attributes.peerPublicKey))
                    .font(.system(size: fontSize, weight: .bold))
                    .foregroundColor(.white)
            }
            .frame(width: size, height: size)
        }
    }

    private func loadSharedAvatar() -> UIImage? {
        guard let url = FileManager.default.containerURL(forSecurityApplicationGroupIdentifier: appGroupID)?
                .appendingPathComponent("call_avatar.jpg"),
              let data = try? Data(contentsOf: url),
              let img = UIImage(data: data) else { return nil }
        return img
    }

    // MARK: - Helpers

    private func fmt(_ sec: Int) -> String {
        String(format: "%d:%02d", sec / 60, sec % 60)
    }

    private func makeInitials(_ name: String, _ pubKey: String) -> String {
        let words = name.trimmingCharacters(in: .whitespaces)
            .split(whereSeparator: { $0.isWhitespace })
            .filter { !$0.isEmpty }
        switch words.count {
        case 0:
            return pubKey.isEmpty ? "?" : String(pubKey.prefix(2)).uppercased()
        case 1:
            return String(words[0].prefix(2)).uppercased()
        default:
            return "\(words[0].prefix(1))\(words[1].prefix(1))".uppercased()
        }
    }
}