//
//  ContentView.swift
//  Name a Color!
//
//  Created by Travis Harbin on 8/30/26.
//

import SwiftUI
#if os(macOS)
import AppKit
#else
import UIKit
#endif

struct Item: Codable, Identifiable {
    let id: Int
    let name: String
    let color: String
    let timestamp: Int
}

struct WarningAlertModel: Identifiable {
    let id = UUID()
    let title: String
    let message: String
}

extension Color {
    init(hex: String) {
        let hex = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        let value = UInt64(hex, radix: 16) ?? 0
        
        self.init(
            red: Double((value >> 16) & 0xFF) / 255,
            green: Double((value >> 8) & 0xFF) / 255,
            blue: Double(value & 0xFF) / 255
        )
    }
    
    //ai func
    func toHex() -> String? {
        #if canImport(UIKit)
        let color = UIColor(self)

        guard let color = color.cgColor.converted(
            to: CGColorSpace(name: CGColorSpace.sRGB)!,
            intent: .defaultIntent,
            options: nil
        ) else {
            return nil
        }

        let components = color.components ?? []

        guard components.count >= 3 else {
            return nil
        }

        let r = Int(round(components[0] * 255))
        let g = Int(round(components[1] * 255))
        let b = Int(round(components[2] * 255))

        return String(format: "%02X%02X%02X", r, g, b)

        #elseif canImport(AppKit)
        let color = NSColor(self)

        guard let color = color.usingColorSpace(.sRGB) else {
            return nil
        }

        let r = Int(round(color.redComponent * 255))
        let g = Int(round(color.greenComponent * 255))
        let b = Int(round(color.blueComponent * 255))

        return String(format: "%02X%02X%02X", r, g, b)
        #endif
    }
}

extension String {
    func base64Decoded() -> String? {
        guard let data = Data(base64Encoded: self) else { return nil }
        return String(data: data, encoding: .utf8)
    }
}

struct ContentView: View {
    @State private var items: [Item] = []
    @State private var total: Int = 255 * 255 * 255
    @State private var selectedColor: Color = Color.blue
    @State private var selectedName: String = ""
    @State private var activeWarning: WarningAlertModel?

    func updateItems() async throws {
        let url = URL(string: "https://nameacolor.lncvrt.xyz/get.php")!
        let (data, _) = try await URLSession.shared.data(from: url)
        items = try JSONDecoder().decode([Item].self, from: data)
    }

    var body: some View {
        VStack {
            HStack {
                Spacer()
                Text("Name a Color!")
                    .font(.title)
                    .fontWeight(.bold)
                Spacer()
                Button {
                    items = []
                    Task {
                        do {
                            try await updateItems()
                        } catch {
                            print("failed to fetch items:", error)
                        }
                    }
                } label: {
                    Image(systemName: "arrow.clockwise")
                        .font(.system(size: 14, weight: .semibold))
                        .frame(width: 32, height: 32)
                }
                .buttonStyle(.plain)
                .background(.gray.opacity(0.12))
                .clipShape(Circle())
                .help("Refresh")
            }
            Text("\(items.count.formatted())/\(total.formatted()) colors named (\((total - items.count).formatted()) left)")
            
            Text("Name your own color!")
                .font(.title2)
                .fontWeight(.bold)
                .padding(.top)
            HStack {
                ColorPicker("Color", selection: $selectedColor, supportsOpacity: true)
                    .padding()
                TextField("Name", text: $selectedName)
                Button("Name it!") {
                    Task {
                        let url = URL(string: "https://nameacolor.lncvrt.xyz/upload.php?color=" + (selectedColor.toHex() ?? "FFFFFF") + "&name=" + selectedName)!
                        let (data, _) = try await URLSession.shared.data(from: url)
                        let response = String(data: data, encoding: .utf8)
                        
                        if response == "-1" {
                            activeWarning = WarningAlertModel(title: "Failed to upload color", message: "Invalid color")
                        } else if response == "-2" {
                            activeWarning = WarningAlertModel(title: "Failed to upload color", message: "Name too short")
                        } else if response == "-3" {
                            activeWarning = WarningAlertModel(title: "Failed to upload color", message: "Name too long")
                        } else if response == "-4" {
                            activeWarning = WarningAlertModel(title: "Failed to upload color", message: "Color already taken")
                        } else if response == "-5" {
                            activeWarning = WarningAlertModel(title: "Failed to upload color", message: "Name already taken")
                        } else {
                            activeWarning = WarningAlertModel(title: "uploaded", message: "kaboom")
                        }
                    }
                }
                .buttonStyle(.bordered)
            }
            
            Text("Colors that were named")
                .font(.title2)
                .fontWeight(.bold)
                .padding(.top)

            ScrollView {
                LazyVGrid(
                    columns: [GridItem(.adaptive(minimum: 210), spacing: 14)],
                    spacing: 14
                ) {
                    ForEach(items) { item in
                        VStack(alignment: .leading, spacing: 12) {
                            Color(hex: item.color)
                                .frame(height: 100)
                                .clipShape(RoundedRectangle(cornerRadius: 12))

                            VStack(alignment: .leading, spacing: 4) {
                                Text(item.name.base64Decoded() ?? "???")
                                    .font(.headline)
                                    .foregroundStyle(.primary)

                                Text("#" + item.color.uppercased())
                                    .font(.system(.subheadline, design: .monospaced))
                                    .foregroundStyle(.secondary)
                                    .textSelection(.enabled)
                            }
                        }
                        .padding(12)
                        .frame(maxWidth: .infinity, alignment: .leading)
                        .background(.gray.opacity(0.12))
                        .clipShape(RoundedRectangle(cornerRadius: 16))
                        .overlay {
                            RoundedRectangle(cornerRadius: 16)
                                .stroke(.primary.opacity(0.06), lineWidth: 1)
                        }
                    }
                }
                .padding()
                .task {
                    do {
                        try await updateItems()
                    } catch {
                        print("failed to fetch items:", error)
                    }
                }
            }
        }
        .alert(item: $activeWarning) { warning in
            Alert(
                title: Text(warning.title),
                message: Text(warning.message),
                dismissButton: .default(Text("OK"))
            )
        }
        .padding()
    }
}

#Preview {
    ContentView()
}