Atoll/DynamicIsland/components/Stats/CPUStatsSharedViews.swift

//
//  CPUStatsSharedViews.swift
//  DynamicIsland
//
//  Shared CPU stats UI components reused across the notch stats tab
//  and the legacy stats panel.
//
//  Created by GitHub Copilot on 19/10/2025.
//

import SwiftUI

struct StatsCard<Content: View>: View {
    let title: String
    let padding: CGFloat
    let background: Color
    let cornerRadius: CGFloat
    let content: Content
    
    init(
        title: String,
        padding: CGFloat = 16,
        background: Color = Color(nsColor: .windowBackgroundColor).opacity(0.65),
        cornerRadius: CGFloat = 12,
        @ViewBuilder content: () -> Content
    ) {
        self.title = title
        self.padding = padding
        self.background = background
        self.cornerRadius = cornerRadius
        self.content = content()
    }
    
    var body: some View {
        VStack(alignment: .leading, spacing: 12) {
            Text(title)
                .font(.headline)
                .foregroundStyle(.primary)
            
            content
        }
        .padding(padding)
        .frame(maxWidth: .infinity, alignment: .leading)
        .background(
            RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
                .fill(background)
        )
        .overlay(
            RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
                .stroke(Color.white.opacity(0.05), lineWidth: 0.5)
        )
    }
}

struct CPUUsageDashboard: View {
    let breakdown: CPULoadBreakdown
    let loadAverage: LoadAverage
    let uptime: TimeInterval
    let coreCount: Int
    let systemColor: Color
    let userColor: Color
    let idleColor: Color
    
    var body: some View {
        HStack(alignment: .center, spacing: 28) {
            CPUSegmentDonut(
                breakdown: breakdown,
                systemColor: systemColor,
                userColor: userColor,
                idleColor: idleColor
            )
            .frame(width: 132, height: 132)
            
            VStack(alignment: .leading, spacing: 12) {
                Text("Usage")
                    .font(.caption)
                    .foregroundColor(.secondary)
                DetailRow(color: systemColor.opacity(0.95), label: "System", value: StatsFormatting.percentage(breakdown.system))
                DetailRow(color: userColor.opacity(0.95), label: "User", value: StatsFormatting.percentage(breakdown.user))
                DetailRow(color: idleColor.opacity(0.7), label: "Idle", value: StatsFormatting.percentage(breakdown.idle))
                DetailRow(color: nil, label: "Active", value: StatsFormatting.percentage(breakdown.activeUsage))
            }
            .frame(maxWidth: .infinity, alignment: .leading)
            
            VStack(alignment: .leading, spacing: 10) {
                Text("System")
                    .font(.caption)
                    .foregroundColor(.secondary)
                DetailRow(color: nil, label: "Logical cores", value: "\(max(coreCount, 1))")
                DetailRow(color: nil, label: "Uptime", value: StatsFormatting.abbreviatedDuration(uptime))
                Divider().padding(.vertical, 4)
                DetailRow(color: nil, label: "Load 1m", value: String(format: "%.2f", loadAverage.oneMinute))
                DetailRow(color: nil, label: "Load 5m", value: String(format: "%.2f", loadAverage.fiveMinutes))
                DetailRow(color: nil, label: "Load 15m", value: String(format: "%.2f", loadAverage.fifteenMinutes))
            }
            .frame(maxWidth: .infinity, alignment: .leading)
        }
    }
}

private struct CPUSegmentDonut: View {
    let breakdown: CPULoadBreakdown
    let systemColor: Color
    let userColor: Color
    let idleColor: Color
    
    var body: some View {
        ZStack {
            Circle()
                .stroke(idleColor.opacity(0.3), lineWidth: 14)
            CPUUsageRing(
                breakdown: breakdown,
                systemColor: systemColor,
                userColor: userColor,
                lineWidth: 14
            )
            VStack(spacing: 4) {
                Text(StatsFormatting.percentage(breakdown.activeUsage))
                    .font(.system(size: 30, weight: .bold, design: .rounded))
                Text("Active")
                    .font(.footnote)
                    .foregroundColor(.secondary)
            }
        }
    }
}

struct CPUUsageRing: View {
    let breakdown: CPULoadBreakdown
    let systemColor: Color
    let userColor: Color
    var lineWidth: CGFloat = 14
    
    var body: some View {
        let segments = breakdown.normalizedSegments
        ZStack {
            if segments.system > 0 {
                RingArc(start: 0, end: segments.system, color: systemColor, lineWidth: lineWidth)
            }
            if segments.user > 0 {
                RingArc(start: segments.system, end: segments.system + segments.user, color: userColor, lineWidth: lineWidth)
            }
        }
    }
}

struct RingArc: View {
    let start: Double
    let end: Double
    let color: Color
    var lineWidth: CGFloat = 14
    
    var body: some View {
        Circle()
            .trim(from: CGFloat(start), to: CGFloat(end))
            .stroke(color, style: StrokeStyle(lineWidth: lineWidth, lineCap: .round))
            .rotationEffect(.degrees(-90))
    }
}

struct LegendRow: View {
    let color: Color
    let title: String
    let value: String
    
    var body: some View {
        HStack(spacing: 8) {
            Circle()
                .fill(color)
                .frame(width: 10, height: 10)
            Text(title)
                .font(.system(size: 12, weight: .medium))
                .foregroundColor(.secondary)
            Spacer()
            Text(value)
                .font(.system(size: 13, weight: .semibold, design: .monospaced))
                .foregroundColor(.primary)
        }
    }
}

struct LoadAverageRow: View {
    let loadAverage: LoadAverage
    
    var body: some View {
        VStack(alignment: .leading, spacing: 4) {
            Text("Load Average")
                .font(.caption)
                .foregroundColor(.secondary)
            HStack(spacing: 12) {
                LoadAverageValue(label: "1m", value: loadAverage.oneMinute)
                LoadAverageValue(label: "5m", value: loadAverage.fiveMinutes)
                LoadAverageValue(label: "15m", value: loadAverage.fifteenMinutes)
            }
        }
    }
}

struct LoadAverageValue: View {
    let label: String
    let value: Double
    
    var body: some View {
        VStack(spacing: 2) {
            Text(label)
                .font(.caption2)
                .foregroundColor(.secondary)
            Text(String(format: "%.2f", value))
                .font(.system(size: 13, weight: .semibold, design: .monospaced))
                .foregroundColor(.primary)
        }
    }
}

struct DetailRow: View {
    let color: Color?
    let label: String
    let value: String
    
    var body: some View {
        HStack {
            if let color {
                Circle()
                    .fill(color)
                    .frame(width: 8, height: 8)
            }
            Text(label)
                .font(.system(size: 12, weight: .medium))
                .foregroundColor(.secondary)
                .lineLimit(1)
                .layoutPriority(0.5)
            Spacer()
            Text(value)
                .font(.system(size: 13, weight: .semibold, design: .monospaced))
                .foregroundColor(.primary)
                .lineLimit(1)
                .minimumScaleFactor(0.85)
                .layoutPriority(1)
        }
    }
}

struct CPUCoreUsageGrid: View {
    let cores: [CPUCoreUsage]
    let accentColor: Color

    private var columns: [GridItem] {
        [GridItem(.adaptive(minimum: 90), spacing: 14, alignment: .top)]
    }

    var body: some View {
        LazyVGrid(columns: columns, spacing: 14) {
            ForEach(cores) { core in
                CPUCoreUsageCell(core: core, accentColor: accentColor)
            }
        }
    }
}

private struct CPUCoreUsageCell: View {
    let core: CPUCoreUsage
    let accentColor: Color

    var body: some View {
        VStack(alignment: .leading, spacing: 8) {
            HStack {
                Text("Core \(core.id + 1)")
                    .font(.caption)
                    .foregroundColor(.secondary)
                Spacer()
                Text(StatsFormatting.percentage(core.usage))
                    .font(.system(size: 12, weight: .semibold, design: .monospaced))
                    .foregroundColor(accentColor)
            }
            GeometryReader { proxy in
                let width = proxy.size.width
                let progress = max(0, min(core.usage / 100, 1))
                ZStack(alignment: .leading) {
                    Capsule()
                        .fill(Color.primary.opacity(0.08))
                    Capsule()
                        .fill(accentColor)
                        .frame(width: width * progress)
                }
            }
            .frame(height: 8)
        }
        .padding(10)
        .background(
            RoundedRectangle(cornerRadius: 10, style: .continuous)
                .fill(Color(nsColor: .controlBackgroundColor).opacity(0.6))
        )
    }
}

struct CPUDetailsGrid: View {
    let breakdown: CPULoadBreakdown
    let loadAverage: LoadAverage
    let uptime: TimeInterval
    let coreCount: Int
    let systemColor: Color
    let userColor: Color
    var showLoadAverage: Bool = true

    var body: some View {
        VStack(alignment: .leading, spacing: 14) {
            VStack(alignment: .leading, spacing: 8) {
                Text("Usage Breakdown")
                    .font(.caption)
                    .foregroundColor(.secondary)
                DetailRow(color: nil, label: "Total", value: StatsFormatting.percentage(breakdown.activeUsage))
                DetailRow(color: systemColor, label: "System", value: StatsFormatting.percentage(breakdown.system))
                DetailRow(color: userColor, label: "User", value: StatsFormatting.percentage(breakdown.user))
                DetailRow(color: Color.gray.opacity(0.4), label: "Idle", value: StatsFormatting.percentage(breakdown.idle))
            }

            Divider().padding(.vertical, 4)

            VStack(alignment: .leading, spacing: 8) {
                Text("System")
                    .font(.caption)
                    .foregroundColor(.secondary)
                DetailRow(color: nil, label: "Logical cores", value: "\(max(coreCount, 1))")
                DetailRow(color: nil, label: "Uptime", value: StatsFormatting.abbreviatedDuration(uptime))
            }

            if showLoadAverage {
                Divider().padding(.vertical, 4)
                LoadAverageRow(loadAverage: loadAverage)
            }
        }
    }
}


struct CPUProcessList: View {
    let processes: [ProcessStats]
    let accentColor: Color
    var displayLimit: Int? = nil
    
    private var visibleProcesses: [ProcessStats] {
        if let limit = displayLimit {
            return Array(processes.prefix(limit))
        }
        return processes
    }
    
    var body: some View {
        VStack(spacing: 8) {
            if visibleProcesses.isEmpty {
                Text("No process data yet. Keep stats open for a moment.")
                    .font(.footnote)
                    .foregroundColor(.secondary)
                    .frame(maxWidth: .infinity, alignment: .leading)
            } else {
                ForEach(visibleProcesses) { process in
                    CPUProcessRow(process: process, accentColor: accentColor)
                    if process.id != visibleProcesses.last?.id {
                        Divider().padding(.leading, 32)
                    }
                }
            }
        }
    }
}

struct CPUProcessRow: View {
    let process: ProcessStats
    let accentColor: Color
    
    var body: some View {
        HStack(spacing: 12) {
            iconView
                .frame(width: 24, height: 24)
                .clipShape(RoundedRectangle(cornerRadius: 6, style: .continuous))
                .overlay(
                    RoundedRectangle(cornerRadius: 6, style: .continuous)
                        .stroke(Color.white.opacity(0.08), lineWidth: 0.5)
                )
            
            VStack(alignment: .leading, spacing: 2) {
                Text(process.name)
                    .font(.system(size: 13, weight: .semibold))
                    .lineLimit(1)
                Text(process.memoryUsageString)
                    .font(.caption2)
                    .foregroundColor(.secondary)
                    .lineLimit(1)
            }
            
            Spacer()
            
            Text(process.cpuUsageString)
                .font(.system(size: 13, weight: .semibold, design: .monospaced))
                .foregroundColor(accentColor)
        }
    }
    
    private var iconView: some View {
        Group {
            if let icon = process.icon {
                Image(nsImage: icon)
                    .resizable()
                    .scaledToFit()
            } else {
                ZStack {
                    accentColor.opacity(0.15)
                    Image(systemName: "app")
                        .font(.system(size: 12, weight: .medium))
                        .foregroundColor(accentColor)
                }
            }
        }
    }
}