//
//  Gifu_tvOSTests.swift
//  Gifu_tvOSTests
//
//  Created by Gruppioni Michele on 17/02/18.
//  Copyright © 2018 Kaishin & Co. All rights reserved.
//

import XCTest
import ImageIO
@testable import Gifu_tvOS

private let imageData = testImageDataNamed("mugen.gif")
private let staticImage = UIImage(data: imageData)!
private let preloadFrameCount = 20

class DummyAnimatable: GIFAnimatable {
    init() {}
    var animator: Animator? = nil
    var image: UIImage? = nil
    var layer = CALayer()
    var frame: CGRect = .zero
    var contentMode: UIViewContentMode = .scaleToFill
    func animatorHasNewFrame() {}
}

class GifuTests: XCTestCase {
    var animator: Animator!
    var originalFrameCount: Int!
    let delegate = DummyAnimatable()
    
    override func setUp() {
        super.setUp()
        animator = Animator(withDelegate: delegate)
        animator.prepareForAnimation(withGIFData: imageData, size: staticImage.size, contentMode: .scaleToFill)
        originalFrameCount = 44
    }
    
    func testIsAnimatable() {
        XCTAssertNotNil(animator.frameStore)
        guard let store = animator.frameStore else { return }
        XCTAssertTrue(store.isAnimatable)
    }
    
    func testCurrentFrame() {
        XCTAssertNotNil(animator.frameStore)
        guard let store = animator.frameStore else { return }
        XCTAssertEqual(store.currentFrameIndex, 0)
    }
    
    func testFramePreload() {
        XCTAssertNotNil(animator.frameStore)
        guard let store = animator.frameStore else { return }
        
        let expectation = self.expectation(description: "frameDuration")
        
        store.prepareFrames {
            let animatedFrameCount = store.animatedFrames.count
            XCTAssertEqual(animatedFrameCount, self.originalFrameCount)
            XCTAssertNotNil(store.frame(at: preloadFrameCount - 1))
            XCTAssertNil(store.frame(at: preloadFrameCount + 1)?.images)
            XCTAssertEqual(store.currentFrameIndex, 0)
            
            store.shouldChangeFrame(with: 1.0) { hasNewFrame in
                XCTAssertTrue(hasNewFrame)
                XCTAssertEqual(store.currentFrameIndex, 1)
                expectation.fulfill()
            }
        }
        
        waitForExpectations(timeout: 1.0) { error in
            if let error = error {
                print("Error: \(error.localizedDescription)")
            }
        }
    }
    
    func testFrameInfo() {
        XCTAssertNotNil(animator.frameStore)
        guard let store = animator.frameStore else { return }
        
        let expectation = self.expectation(description: "testFrameInfoIsAccurate")
        
        store.prepareFrames {
            let frameDuration = store.frame(at: 5)?.duration ?? 0
            XCTAssertTrue((frameDuration - 0.05) < 0.00001)
            
            let imageSize = store.frame(at: 5)?.size ?? CGSize.zero
            XCTAssertEqual(imageSize, staticImage.size)
            
            expectation.fulfill()
        }
        
        waitForExpectations(timeout: 1.0) { error in
            if let error = error {
                print("Error: \(error.localizedDescription)")
            }
        }
    }
}

private func testImageDataNamed(_ name: String) -> Data {
    let testBundle = Bundle(for: GifuTests.self)
    let imagePath = testBundle.bundleURL.appendingPathComponent(name)
    return (try! Data(contentsOf: imagePath))
}