//
//  LivingAlbum.swift
//  Focale
//
//  Author: Simon-Pierre Boucher
//  Contact: contact@spboucher.ai
//
//  An album defined by a query, not a selection (CLAUDE.md §7).
//  It fills itself as you shoot.
//

import Foundation
import Observation

struct LivingAlbum: Codable, Identifiable, Sendable {
    let id: UUID
    var name: String
    var filter: SearchFilter

    init(id: UUID = UUID(), name: String, filter: SearchFilter) {
        self.id = id
        self.name = name
        self.filter = filter
    }
}

@MainActor
@Observable
final class LivingAlbumStore {
    private(set) var albums: [LivingAlbum] = []
    private let fileURL: URL

    init(directory: URL = .applicationSupportDirectory) {
        fileURL = directory.appending(path: "living-albums.json")
        load()
        if albums.isEmpty {
            albums = Self.starters
            save()
        }
    }

    func add(_ album: LivingAlbum) {
        albums.append(album)
        save()
    }

    func remove(_ id: LivingAlbum.ID) {
        albums.removeAll { $0.id == id }
        save()
    }

    // User-facing names in French.
    private static var starters: [LivingAlbum] {
        var receipts = SearchFilter.empty
        receipts.kinds = [PhotoKind.receipt.rawValue]

        var actionable = SearchFilter.empty
        actionable.actionableOnly = true

        return [
            LivingAlbum(name: "Tous mes reçus", filter: receipts),
            LivingAlbum(name: "Infos à conserver", filter: actionable),
        ]
    }

    private func load() {
        guard let data = try? Data(contentsOf: fileURL),
              let decoded = try? JSONDecoder().decode([LivingAlbum].self, from: data)
        else { return }
        albums = decoded
    }

    private func save() {
        guard let data = try? JSONEncoder().encode(albums) else { return }
        try? FileManager.default.createDirectory(
            at: fileURL.deletingLastPathComponent(),
            withIntermediateDirectories: true
        )
        try? data.write(to: fileURL, options: .atomic)
    }
}