//
//  TaskView.swift
//  Todos
//
//  Created by Sam Jaffe on 2/28/26.
//

import SwiftUI
import SwiftData

struct TaskView: View {
  @Environment(\.modelContext) private var modelContext
  @AppStorage(UserDefaultsKeys.Category) var allGroups = CodableArray<Category>()
  @Binding var task: Task

  @State private var showDialogue: Bool = false
  @State private var hideTags: Bool = false
  @State private var hideNotes: Bool = false
  @State private var empty = Category()
  let unset: Priority? = nil

  @FocusState private var isFocused: Bool

  var body: some View {
    VStack {
      HStack {
        if let priority = task.priority {
          Image(systemName: priority.label)
            .foregroundStyle(priority.style)
            .bold()
            .frame(width: 20)
            .padding(.trailing, -10)
        }

        StatusPicker(status: $task.status)
          .onChange(of: task.status) {
            if task.status.isStrong {
              task.subtasks
                .filter({ !$0.status.isStrong })
                .forEach({ subtask in subtask.status = task.status })
            }
          }

        TextField("Task Name", text: $task.name)
          .focused($isFocused)

        if let grp = $allGroups.first(where: { $0.name.wrappedValue == task.category }) {
          ColorPicker("", selection: grp.color).disabled(true).scaledToFit()
        }

        Button(action: addItem) {
          Image(systemName: "plus")
            .help("Add a Subtask")
        }
        Button {
          showDialogue = !showDialogue
        } label: {
          Label("", systemImage: "ellipsis.circle")
            .foregroundStyle(.gray)
            .font(.title2)
        }
        .buttonStyle(.borderless)
        .popover(isPresented: $showDialogue) {
          List{
            Picker("Task Category", selection: $task.category) {
              Text(empty.name).tag("")
              ForEach(allGroups) { group in
                Text(group.name)
              }
            }
            .fixedSize(horizontal: true, vertical: false)

            Picker("Priority", selection: $task.priority) {
              Text("").tag(unset)
              ForEach(Priority.allCases) { unit in
                Text(unit.id).tag(unit)
              }
            }
          }
        }
        Text("")
      }

      if isFocused || !(hideTags || task.tags.isEmpty) {
        HStack {
          TagBarView(task: $task)
            .font(.footnote)
            .padding(.leading, 30)
          VisibilityTapper(hideToggle: $hideTags)
        }.focused($isFocused)
      }

      if isFocused || !(hideNotes || task.notes.isEmpty) {
        HStack {
          TextField("Notes", text: $task.notes, axis: .vertical)
            .font(.footnote)
            .padding(.leading, 30)
          VisibilityTapper(hideToggle: $hideNotes)
        }.focused($isFocused)
      }
    }
  }

  private func addItem() {
    withAnimation {
      let newSubtask = SubTask(parent: task)
      modelContext.insert(newSubtask)
      task.subtasks.append(newSubtask)
    }
  }
}

#Preview {
  @Previewable @State var task = Task()
  TaskView(task: $task)
    .frame(minHeight: 100) // Preview does not resize window properly
}