import Foundation
import SwiftData
import SwiftUI

@Model
final class Split {
    var name: String = ""
    var intro: String = ""
    
    @Relationship(deleteRule: .cascade, inverse: \SplitExerciseAssignment.split)
    var exercises: [SplitExerciseAssignment]? = []
    
    @Relationship(deleteRule: .nullify, inverse: \Workout.split)
    var workouts: [Workout]? = []
    
    init(name: String, intro: String) {
        self.name = name
        self.intro = intro
    }
}

// MARK: - EditableEntity Conformance

extension Split: EditableEntity {
    var count: Int? {
        return self.exercises?.count
    }

    static func createNew() -> Split {
        return Split(name: "", intro: "")
    }
    
    static var navigationTitle: String {
        return "Splits"
    }
    
    @ViewBuilder
    static func formView(for model: Split) -> some View {
        EntityAddEditView(model: model) { $model in
            SplitFormView(model: $model)
        }
    }
}

// MARK: - Private Form View

fileprivate struct SplitFormView: View {
    @Binding var model: Split
    @State private var itemToDelete: SplitExerciseAssignment? = nil

    var body: some View {
        Section(header: Text("Name")) {
            TextField("Name", text: $model.name)
                .bold()
        }
        
        Section(header: Text("Description")) {
            TextEditor(text: $model.intro)
                .frame(minHeight: 100)
        }
        
        Section(header: Text("Exercises")) {
            if let assignments = model.exercises, !assignments.isEmpty {
                ForEach(assignments) { item in
                    ListItem(
                        title: item.exercise?.name ?? "Unnamed",
                        subtitle: "\(item.sets) × \(item.reps) @ \(item.weight) lbs"
                    )
                    .swipeActions {
                        Button(role: .destructive) {
                            itemToDelete = item
                        } label: {
                            Label("Delete", systemImage: "trash")
                        }
                    }
                }
            } else {
                Text("No exercises added yet.")
            }
            Button(action: {
                // TODO: Implement add exercise functionality
            }) {
                Label("Add Exercise", systemImage: "plus.circle")
            }
        }
        .confirmationDialog("Delete Exercise?", isPresented: .constant(itemToDelete != nil), titleVisibility: .visible) {
            Button("Delete", role: .destructive) {
                if let item = itemToDelete {
                    withAnimation {
                        model.exercises?.removeAll { $0.id == item.id }
                        itemToDelete = nil
                    }
                }
            }
        }
    }
}