//
//  MockImageStorage.swift
//  PlantGuideTests
//
//  Mock implementation of ImageStorageProtocol for unit testing.
//  Provides configurable behavior and call tracking for verification.
//

import Foundation
import UIKit
@testable import PlantGuide

// MARK: - MockImageStorage

/// Mock implementation of ImageStorageProtocol for testing
final actor MockImageStorage: ImageStorageProtocol {

    // MARK: - Storage

    private var storedImages: [String: UIImage] = [:]
    private var plantImages: [UUID: [String]] = [:]

    // MARK: - Call Tracking

    private(set) var saveCallCount = 0
    private(set) var loadCallCount = 0
    private(set) var deleteCallCount = 0
    private(set) var deleteAllCallCount = 0

    // MARK: - Error Configuration

    var shouldThrowOnSave = false
    var shouldThrowOnLoad = false
    var shouldThrowOnDelete = false
    var shouldThrowOnDeleteAll = false

    var errorToThrow: Error = ImageStorageError.writeFailed(
        NSError(domain: "MockError", code: -1, userInfo: [NSLocalizedDescriptionKey: "Mock storage error"])
    )

    // MARK: - Captured Values

    private(set) var lastSavedImage: UIImage?
    private(set) var lastSavedPlantID: UUID?
    private(set) var lastLoadedPath: String?
    private(set) var lastDeletedPath: String?
    private(set) var lastDeletedAllPlantID: UUID?

    // MARK: - Generated Path Control

    var pathToReturn: String?

    // MARK: - ImageStorageProtocol

    func save(_ image: UIImage, for plantID: UUID) async throws -> String {
        saveCallCount += 1
        lastSavedImage = image
        lastSavedPlantID = plantID

        if shouldThrowOnSave {
            throw errorToThrow
        }

        // Generate or use provided path
        let path = pathToReturn ?? "\(plantID.uuidString)/\(UUID().uuidString).jpg"

        // Store the image
        storedImages[path] = image

        // Track images per plant
        var paths = plantImages[plantID] ?? []
        paths.append(path)
        plantImages[plantID] = paths

        return path
    }

    func load(path: String) async -> UIImage? {
        loadCallCount += 1
        lastLoadedPath = path
        return storedImages[path]
    }

    func delete(path: String) async throws {
        deleteCallCount += 1
        lastDeletedPath = path

        if shouldThrowOnDelete {
            throw errorToThrow
        }

        guard storedImages[path] != nil else {
            throw ImageStorageError.fileNotFound
        }

        storedImages.removeValue(forKey: path)

        // Remove from plant tracking
        for (plantID, var paths) in plantImages {
            if let index = paths.firstIndex(of: path) {
                paths.remove(at: index)
                plantImages[plantID] = paths
                break
            }
        }
    }

    func deleteAll(for plantID: UUID) async throws {
        deleteAllCallCount += 1
        lastDeletedAllPlantID = plantID

        if shouldThrowOnDeleteAll {
            throw errorToThrow
        }

        // Remove all images for this plant
        if let paths = plantImages[plantID] {
            for path in paths {
                storedImages.removeValue(forKey: path)
            }
            plantImages.removeValue(forKey: plantID)
        }
    }

    // MARK: - Helper Methods

    /// Resets all state for clean test setup
    func reset() {
        storedImages = [:]
        plantImages = [:]

        saveCallCount = 0
        loadCallCount = 0
        deleteCallCount = 0
        deleteAllCallCount = 0

        shouldThrowOnSave = false
        shouldThrowOnLoad = false
        shouldThrowOnDelete = false
        shouldThrowOnDeleteAll = false

        lastSavedImage = nil
        lastSavedPlantID = nil
        lastLoadedPath = nil
        lastDeletedPath = nil
        lastDeletedAllPlantID = nil

        pathToReturn = nil
    }

    /// Adds an image directly to storage (bypasses save method)
    func addImage(_ image: UIImage, at path: String, for plantID: UUID) {
        storedImages[path] = image
        var paths = plantImages[plantID] ?? []
        paths.append(path)
        plantImages[plantID] = paths
    }

    /// Gets stored image count
    var imageCount: Int {
        storedImages.count
    }

    /// Gets image count for a specific plant
    func imageCount(for plantID: UUID) -> Int {
        plantImages[plantID]?.count ?? 0
    }

    /// Gets all paths for a plant
    func paths(for plantID: UUID) -> [String] {
        plantImages[plantID] ?? []
    }

    /// Checks if an image exists at a path
    func imageExists(at path: String) -> Bool {
        storedImages[path] != nil
    }
}

// MARK: - Test Image Creation Helper

extension MockImageStorage {
    /// Creates a simple test image for use in tests
    static func createTestImage(
        color: UIColor = .red,
        size: CGSize = CGSize(width: 100, height: 100)
    ) -> UIImage {
        let renderer = UIGraphicsImageRenderer(size: size)
        return renderer.image { context in
            color.setFill()
            context.fill(CGRect(origin: .zero, size: size))
        }
    }
}