//
//  SymbolPickerView.swift
//  Haru_Danim
//
//  SF Symbols 아이콘 선택기 (검색 + 카테고리 탐색)
//

import SwiftUI

struct SymbolPickerView: View {
    @Environment(\.dismiss) private var dismiss
    @Binding var selection: String

    @State private var searchText = ""
    @State private var category: String

    init(selection: Binding<String>) {
        _selection = selection
        _category = State(initialValue: SymbolCatalog.categories.first?.name ?? "")
    }

    private var symbols: [String] {
        let trimmed = searchText.trimmingCharacters(in: .whitespaces).lowercased()
        if !trimmed.isEmpty {
            return SymbolCatalog.allSymbols.filter { $0.contains(trimmed) }
        }
        return SymbolCatalog.categories.first { $0.name == category }?.symbols ?? []
    }

    var body: some View {
        NavigationStack {
            VStack(spacing: 0) {
                if searchText.isEmpty {
                    categoryBar
                }
                ScrollView {
                    LazyVGrid(columns: [GridItem(.adaptive(minimum: 52), spacing: 10)], spacing: 10) {
                        ForEach(symbols, id: \.self) { symbol in
                            Button {
                                selection = symbol
                                dismiss()
                            } label: {
                                Image(systemName: symbol)
                                    .font(.system(size: 22))
                                    .foregroundStyle(symbol == selection ? Color.white : AppTheme.green)
                                    .frame(width: 52, height: 52)
                                    .background(
                                        symbol == selection ? AppTheme.green : AppTheme.surface,
                                        in: RoundedRectangle(cornerRadius: 12, style: .continuous)
                                    )
                            }
                            .buttonStyle(.plain)
                            .accessibilityLabel(Text(verbatim: symbol))
                        }
                    }
                    .padding()
                }
            }
            .background(AppTheme.background)
            .navigationTitle("아이콘 선택")
            .navigationBarTitleDisplayMode(.inline)
            .searchable(text: $searchText, prompt: "심볼 이름 검색 (영문)")
            .toolbar {
                ToolbarItem(placement: .cancellationAction) {
                    Button("닫기") { dismiss() }
                }
            }
        }
    }

    private var categoryBar: some View {
        ScrollView(.horizontal, showsIndicators: false) {
            HStack(spacing: 8) {
                ForEach(SymbolCatalog.categories) { cat in
                    Button {
                        category = cat.name
                    } label: {
                        Text(cat.name)
                            .font(.subheadline.weight(category == cat.name ? .semibold : .regular))
                            .padding(.horizontal, 14)
                            .padding(.vertical, 7)
                            .background(
                                category == cat.name ? AppTheme.green : AppTheme.surface,
                                in: Capsule()
                            )
                            .foregroundStyle(category == cat.name ? Color.white : Color.primary)
                    }
                    .buttonStyle(.plain)
                }
            }
            .padding(.horizontal)
            .padding(.vertical, 8)
        }
    }
}