//
//  TemplateStore.swift
//  Zyquo Agent
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//
//  Task templates: the built-in library (TaskTemplateLibrary) plus the user's
//  own templates, persisted to templates.json. Built-ins are read-only.
//

import Combine
import Foundation

@MainActor
final class TemplateStore: ObservableObject {
    static let fileName = "templates.json"

    /// User-created templates (CRUD, persisted).
    @Published private(set) var userTemplates: [TaskTemplate] {
        didSet { persistence.save(userTemplates, to: Self.fileName) }
    }

    private let persistence: PersistenceService

    init(persistence: PersistenceService = .shared) {
        self.persistence = persistence
        self.userTemplates = persistence.load([TaskTemplate].self, from: Self.fileName) ?? []
    }

    /// Built-ins first (library order), then user templates.
    var all: [TaskTemplate] {
        TaskTemplateLibrary.builtIn + userTemplates
    }

    func templates(in category: TemplateCategory) -> [TaskTemplate] {
        all.filter { $0.category == category }
    }

    // MARK: - CRUD (user templates only)

    func add(_ template: TaskTemplate) {
        var template = template
        template.isBuiltIn = false
        userTemplates.append(template)
    }

    func update(_ template: TaskTemplate) {
        guard let index = userTemplates.firstIndex(where: { $0.id == template.id }) else { return }
        userTemplates[index] = template
    }

    func delete(_ id: TaskTemplate.ID) {
        userTemplates.removeAll { $0.id == id }
    }
}