//
//  MatchesAPI.swift
//  LiquipediaMenu
//
//  Created by Felix Förtsch on 08.10.18.
//  Copyright © 2018 Felix Förtsch. All rights reserved.
//

import Foundation
import SwiftSoup

class MatchesAPI {
    
    func fetchMatches(for game: String) -> [Match] {
        let games = ["dota2", "starcraft", "starcraft2", "heroes", "counterstrike", "rocketleague", "rainbowsix", "overwatch"]
        if !games.contains(game) { return [Match]() }
        let data = fetchData(for: game)
        let matches = extractMatches(from: data)
        return matches
    }
    
    private func fetchData(for game: String) -> String {
        let url = constructURL(for: game)
//        DispatchQueue.global().async { [unowned self] in
            if let url = URL(string: url) {
                if let data = try? String(contentsOf: url) {
                    return data
                }
            }
//        }
        return ""
    }
    
    private func extractMatches(from data: String) -> [Match] {
        var tmp = data.replacingOccurrences(of: "\\n", with: "")
        tmp = tmp.replacingOccurrences(of: "\\", with: "")
        
        do {
            let doc: Document = try SwiftSoup.parse(tmp)
            let ongoing: Element = try doc.getElementById("infobox_matches")!
            let matchString: Elements = try ongoing.getElementsByTag("table")
            
            var matches = [Match]()
            for match in matchString {
                let score = try match.getElementsByClass("versus").text()
                let split = score.split(separator: ":")
                let leftscore = String(split[0])
                let rightscore = String(split[1])
                
                let newMatch = Match(
                    ongoing: true,
                    streamLink: "https://twitch.tv" + (match.getAttributes()?.get(key: "data-stream-twitch"))! ,
                    league: try match.select("tr > td > div > div > a").text(),
                    team1name: try match.getElementsByClass("team-left").text(),
                    team1score: leftscore,
                    team2name: try match.getElementsByClass("team-right").text(),
                    team2score: rightscore
                )
                matches.append(newMatch)
            }
            return matches
        } catch Exception.Error(_, _) {
            print("")
            return [Match]()
        } catch {
            print("")
            return [Match]()
        }
    }
    
    private func constructURL(for game: String) -> String {
        let baseURL = "https://liquipedia.net/"
        let query = "/api.php?action=parse&page=Liquipedia:Upcoming_and_ongoing_matches&format=json&prop=text"
        return baseURL + game + query
    }
}