//
//  ARProjectPersisting.swift
//  GasTankAR
//
//  Created by Dennis Nemec on 26.08.26.
//

import ARKit
import CoreLocation
import SwiftData

/// Abstraktion der Projekt-Persistenz für den AR-Modus (Dependency Inversion):
/// Der Controller kennt so kein SwiftData und ist unit-testbar.
@MainActor
protocol ARProjectPersisting: AnyObject {
    var tank: Tank { get }
    var worldMap: ARWorldMap? { get }
    var tankTransform: [Float]? { get }
    var savedMeasurements: [Measurement] { get }
    var savedPipeRoute: PipeRoute { get }

    func saveWorldMap(_ data: Data)
    func saveTankTransform(_ transform: [Float])
    func saveMeasurements(_ measurements: [Measurement])
    func savePipeRoute(_ route: PipeRoute)
    func clearTankTransform()
    func savePhoto(_ imageData: Data, date: Date, coordinate: CLLocationCoordinate2D?)
}

/// SwiftData-Adapter: verbindet das `Project`-Model mit dem `ARProjectPersisting`-Protokoll.
@MainActor
final class ProjectPersistenceAdapter: ARProjectPersisting {
    private let project: Project
    private let modelContext: ModelContext

    init(project: Project, modelContext: ModelContext) {
        self.project = project
        self.modelContext = modelContext
    }

    var tank: Tank { project.tank }
    var worldMap: ARWorldMap? { project.worldMap }
    var tankTransform: [Float]? { project.tankTransform }

    var savedMeasurements: [Measurement] {
        guard let data = project.measurementsData else { return [] }
        return (try? JSONDecoder().decode([Measurement].self, from: data)) ?? []
    }

    var savedPipeRoute: PipeRoute {
        guard let data = project.pipeRouteData else { return PipeRoute() }
        return (try? JSONDecoder().decode(PipeRoute.self, from: data)) ?? PipeRoute()
    }

    func saveWorldMap(_ data: Data) {
        project.worldMapData = data
        try? modelContext.save()
    }

    func saveTankTransform(_ transform: [Float]) {
        project.tankTransform = transform
        try? modelContext.save()
    }

    func saveMeasurements(_ measurements: [Measurement]) {
        project.measurementsData = try? JSONEncoder().encode(measurements)
        try? modelContext.save()
    }

    func savePipeRoute(_ route: PipeRoute) {
        project.pipeRouteData = try? JSONEncoder().encode(route)
        try? modelContext.save()
    }

    func clearTankTransform() {
        project.tankTransform = nil
        try? modelContext.save()
    }

    func savePhoto(_ imageData: Data, date: Date, coordinate: CLLocationCoordinate2D?) {
        let photo = ProjectPhoto(
            creationDate: date,
            imageData: imageData,
            latitude: coordinate?.latitude,
            longitude: coordinate?.longitude,
            project: project
        )
        modelContext.insert(photo)
        try? modelContext.save()
    }
}