// AddFeedSheet.swift
// Jarvis — add a new RSS feed: URL + name + confirm.

import SwiftUI

struct AddFeedSheet: View {
    /// Returns true on success.
    let onAdd: (String, String) async -> Bool

    @Environment(\.dismiss) private var dismiss
    @State private var url = ""
    @State private var name = ""
    @State private var isSubmitting = false
    @State private var errorMessage: String?

    private var canSubmit: Bool {
        !url.trimmingCharacters(in: .whitespaces).isEmpty &&
        !name.trimmingCharacters(in: .whitespaces).isEmpty &&
        !isSubmitting
    }

    var body: some View {
        ZStack {
            Color.black.ignoresSafeArea()
            VStack(alignment: .leading, spacing: 0) {
                HStack {
                    Text("Add feed")
                        .font(.system(size: 22, weight: .heavy))
                        .foregroundStyle(.white)
                    Spacer()
                    Button { dismiss() } label: {
                        Image(systemName: "xmark")
                            .font(.system(size: 15, weight: .bold))
                            .foregroundStyle(Color(hex: "888888"))
                            .frame(width: 44, height: 44)
                    }
                }
                .padding(.top, 8)

                field(label: "FEED URL", text: $url,
                      placeholder: "https://example.com/rss",
                      mono: true, keyboard: .URL)
                    .padding(.top, 12)

                field(label: "DISPLAY NAME", text: $name,
                      placeholder: "Example News",
                      mono: false, keyboard: .default)
                    .padding(.top, 16)

                if let errorMessage {
                    Text(errorMessage)
                        .font(.system(size: 13))
                        .foregroundStyle(Color(hex: "C25555"))
                        .padding(.top, 14)
                }

                Button {
                    Task { await submit() }
                } label: {
                    HStack {
                        Spacer()
                        if isSubmitting {
                            ProgressView().tint(.black)
                        } else {
                            Text("Add feed").font(.system(size: 16, weight: .bold)).foregroundStyle(.black)
                        }
                        Spacer()
                    }
                    .frame(height: 52)
                    .background(canSubmit ? Palette.orange : Palette.surface2)
                    .clipShape(RoundedRectangle(cornerRadius: 14))
                }
                .disabled(!canSubmit)
                .padding(.top, 28)

                Spacer()
            }
            .padding(.horizontal, 20)
        }
        .preferredColorScheme(.dark)
        .presentationDetents([.medium])
        .presentationDragIndicator(.visible)
    }

    private func field(label: String, text: Binding<String>, placeholder: String,
                       mono: Bool, keyboard: UIKeyboardType) -> some View {
        VStack(alignment: .leading, spacing: 8) {
            Text(label)
                .font(.system(size: 10, weight: .bold, design: .monospaced))
                .kerning(0.8)
                .foregroundStyle(Color(hex: "666666"))
            TextField("", text: text,
                      prompt: Text(placeholder).foregroundColor(Color(hex: "444444")))
                .font(.system(size: 15, weight: .regular, design: mono ? .monospaced : .default))
                .foregroundStyle(mono ? Palette.orange : .white)
                .autocorrectionDisabled()
                .textInputAutocapitalization(.never)
                .keyboardType(keyboard)
                .padding(14)
                .background(Palette.surface)
                .overlay(RoundedRectangle(cornerRadius: 12).stroke(Palette.surface2, lineWidth: 1))
                .clipShape(RoundedRectangle(cornerRadius: 12))
        }
    }

    private func submit() async {
        isSubmitting = true
        errorMessage = nil
        let ok = await onAdd(url.trimmingCharacters(in: .whitespaces),
                             name.trimmingCharacters(in: .whitespaces))
        isSubmitting = false
        if ok { dismiss() } else { errorMessage = "Couldn’t add feed. Check the URL and try again." }
    }
}