//
//  MaterialShowcaseController.swift
//  MaterialShowcase
//
//  Created by Andrei Tulai on 2017-11-06.
//  Copyright © 2017 Aromajoin. All rights reserved.
//

import Foundation

public protocol MaterialShowcaseControllerDelegate: class {
    
    func materialShowcaseController(_ materialShowcaseController: MaterialShowcaseController,
                                    materialShowcaseWillDisappear materialShowcase: MaterialShowcase,
                                    forIndex index: Int)
    func materialShowcaseController(_ materialShowcaseController: MaterialShowcaseController,
                                    materialShowcaseDidDisappear materialShowcase: MaterialShowcase,
                                    forIndex index: Int)
    
}

public extension MaterialShowcaseControllerDelegate {
    func materialShowcaseController(_ materialShowcaseController: MaterialShowcaseController,
                                    materialShowcaseWillDisappear materialShowcase: MaterialShowcase,
                                    forIndex index: Int) {
        // do nothing
    }
    
    func materialShowcaseController(_ materialShowcaseController: MaterialShowcaseController,
                                    materialShowcaseDidDisappear materialShowcase: MaterialShowcase,
                                    forIndex index: Int) {
        // do nothing
    }
}

public protocol MaterialShowcaseControllerDataSource: class {
    func numberOfShowcases(for materialShowcaseController: MaterialShowcaseController) -> Int
    
    func materialShowcaseController(_ materialShowcaseController: MaterialShowcaseController,
                                    showcaseAt index: Int) -> MaterialShowcase?
    
}

open class MaterialShowcaseController {
    public weak var dataSource: MaterialShowcaseControllerDataSource?
    public weak var delegate: MaterialShowcaseControllerDelegate?
    
    public var started = false
    public var currentIndex = -1
    public weak var currentShowcase: MaterialShowcase?
    
    public init() {
        
    }
    
    open func start() {
        started = true
        nextShowcase()
    }
    
    open func stop() {
        started = false
        currentIndex = -1
        currentShowcase?.completeShowcase(animated: true)
    }
    
    @objc open func nextShowcaseForButuon() {
        if let currentShowcase = self.currentShowcase {
            currentShowcase.completeShowcase(animated: true)
            self.currentShowcase = nil
        }
        let numberOfShowcases = dataSource?.numberOfShowcases(for: self) ?? 0
        currentIndex += 1
        let showcase = dataSource?.materialShowcaseController(self, showcaseAt: currentIndex)
        showcase?.delegate = self
        guard currentIndex < numberOfShowcases else {
            started = false
            currentIndex = -1
            return
        }
        currentShowcase = showcase
        showcase?.show(completion: nil)
    }
    
    
    open func nextShowcase() {
        if let currentShowcase = self.currentShowcase {
            currentShowcase.completeShowcase(animated: true)
            self.currentShowcase = nil
        }
        let numberOfShowcases = dataSource?.numberOfShowcases(for: self) ?? 0
        currentIndex += 1
        let showcase = dataSource?.materialShowcaseController(self, showcaseAt: currentIndex)
        showcase?.delegate = self
        guard currentIndex < numberOfShowcases else {
            started = false
            currentIndex = -1
            return
        }
        currentShowcase = showcase
        showcase?.show(completion: nil)
    }
}

extension MaterialShowcaseController: MaterialShowcaseDelegate {
    public func showCaseWillDismiss(showcase: MaterialShowcase) {
        delegate?.materialShowcaseController(self, materialShowcaseWillDisappear: showcase, forIndex: currentIndex)
    }
    public func showCaseDidDismiss(showcase: MaterialShowcase) {
        delegate?.materialShowcaseController(self, materialShowcaseDidDisappear: showcase, forIndex: currentIndex)
        currentShowcase = nil
        if started {
            self.nextShowcase()
        }
    }
}