using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using MU3.CustomUI;
using MU3.Game;
using MU3.User;
using MU3.Util;
using UnityEngine;
using UnityEngine.Networking;
using UnityEngine.UI;

namespace Inohara;

public class Exporter: SingletonMonoBehaviour<Exporter> {
    private struct Config {
        public bool Enable;
        public int Timeout;
        public string BaseUrl;
        public string StatusPoint;
        public string ImportPoint;
        public bool EnableText;
        public bool ExportPBs;
    }
    static readonly float REQ2_DELAY = 4f;
    static readonly float DRAW_DURATION = 4f;
    protected new bool _dontDestroyOnLoad = true;
    private Config _cfg;
    private readonly Dictionary<string, string> _tokens = new();
    private string _currToken = "";
    private readonly Font _arial = Resources.GetBuiltinResource<Font>("Arial.ttf");
    private List<BatchScore> _scores = new();

    private void Log(object o, bool drawText) {
        Debug.Log("[Inohara] " + o.ToString());
        if(_cfg.EnableText && drawText) {
            StartCoroutine(DrawMessage(o.ToString(), new Color(1f, 1f, 1f, 1.0f)));
        }
    }

    private void LogSuccess(object o) {
        Debug.Log("[Inohara] " + o.ToString());
        if(_cfg.EnableText) {
            StartCoroutine(DrawMessage(o.ToString(), new Color(0f, 0.83f, 0.14f, 1.0f)));
        }
    }

    private void LogError(object o) {
        Debug.LogError("[Inohara] " + o.ToString());
        if(_cfg.EnableText) {
            StartCoroutine(DrawMessage(o.ToString(), new Color(1f, 0.42f, 0.42f, 1.0f)));
        }
    }

    public void LoadCfg() {
        _cfg.Enable = false;
        try {
            using StreamReader reader = new(Path.Combine(Application.dataPath, "../inohara.cfg"));
            Dictionary<string, string> options = new();
            Dictionary<string, string> dict = null;
            string line;
            while ((line = reader.ReadLine()) != null) {
                line = line.Split(new char[] { '#' }, 2)[0];
                if(line.ToLower() == "[keys]") {
                    dict = _tokens;
                } else if(line.ToLower() == "[options]") {
                    dict = options;
                } else if(line.StartsWith("[")) {
                    dict = null;
                } else if(dict != null) {
                    string[] tokens = line.Split(new char[] { '=' }, 2);
                    if(tokens.Length == 2) {
                        dict.Add(tokens[0].Trim().ToLower(), tokens[1].Trim());
                    }
                }
            }

            if(!options.ContainsKey("enable") || !bool.TryParse(options["enable"], out _cfg.Enable)) {
                _cfg.Enable = false;
            }
            if(!options.ContainsKey("enableosd") || !bool.TryParse(options["enableosd"], out _cfg.EnableText)) {
                _cfg.EnableText = false;
            }
            if(!options.ContainsKey("exportpbs") || !bool.TryParse(options["exportpbs"], out _cfg.ExportPBs)) {
                _cfg.ExportPBs = false;
            }
            if(!options.ContainsKey("timeout") || !int.TryParse(options["timeout"], out _cfg.Timeout)) {
                _cfg.Timeout = 3;
            }
            if(!options.TryGetValue("baseurl", out _cfg.BaseUrl)) {
                LogError("Config error: missing option BaseUrl");
                _cfg.Enable = false;
            }
            if(!options.TryGetValue("status", out _cfg.StatusPoint)) {
                _cfg.StatusPoint = "/api/v1/status";
            }
            if(!options.TryGetValue("import", out _cfg.ImportPoint)) {
                _cfg.ImportPoint = "/ir/direct-manual/import"; 
            }
        } catch (IOException e) {
            LogError("Config loading failed: " + e);
            _cfg.Enable = false;
        }

        if(_cfg.Enable) {
            Log("Score submissions enabled", true);
        } else {
            Log("Score submissions disabled", true);
        }
    }

    public void Authorize() {
        if(!_cfg.Enable) {
            return;
        }

        var username = Singleton<UserManager>.instance.UserName
            .Normalize(NormalizationForm.FormKC)
            .ToLower();

        _currToken = "";
        _scores.Clear();

        string tmpBearer;
    
        if(!_tokens.ContainsKey(username) && !_tokens.ContainsKey("*")) {
            LogError("User " + username + " not found");
            return;
        } else {
            if(!_tokens.TryGetValue(username, out tmpBearer)) {
                tmpBearer = _tokens["*"];
            }
        }

        StartCoroutine(AuthorizeReq(tmpBearer));
    }

    private IEnumerator AuthorizeReq(string tmpBearer) {
        using var req = new UnityWebRequest(_cfg.BaseUrl + _cfg.StatusPoint, "GET");
        req.SetRequestHeader("Authorization", "Bearer " + tmpBearer);
        req.downloadHandler = new DownloadHandlerBuffer();
        req.timeout = _cfg.Timeout;

        yield return req.Send();

        try {
            if(req.responseCode == 200) {
                var res = JsonUtility.FromJson<StatusResponse>(req.downloadHandler.text);
                if(res.success == true) {
                    if(res.body.permissions.Contains("submit_score")) {
                        LogSuccess("Logged in");
                        Log(string.Format("Tachi {0} (user id={1})", res.body.version, res.body.whoami), false);
                        _currToken = tmpBearer;
                    } else {
                        LogError("Missing the submit_score permission");
                    }
                } else {
                    LogError("Unable to log into Tachi");
                }
            }
        } catch(Exception e) {
            LogError("Unable to log into Tachi: " + e);
        }
    }

    public void Export(BattleResult result, SessionInfo info) {
        if(_currToken == "" || !_cfg.Enable) {
            return;
        }

        StartCoroutine(ExportReq(result, info));
    }

    private IEnumerator ExportReq(BattleResult result, SessionInfo info) {
        using var req = new UnityWebRequest(_cfg.BaseUrl + _cfg.ImportPoint, "POST");
        req.timeout = _cfg.Timeout;
        req.SetRequestHeader("Authorization", "Bearer " + _currToken);
        req.SetRequestHeader("Content-Type", "application/json");
    
        _scores.Add(Util.CreateScore(result, info));
        var batch = Util.CreateBatch(_scores, "inohara");

        byte[] jsonToSend = new UTF8Encoding().GetBytes(batch);
        req.uploadHandler = new UploadHandlerRaw(jsonToSend);
        req.downloadHandler = new DownloadHandlerBuffer();

        Log("Uploading " + _scores.Count + " score(s)", false);

        yield return req.Send();

        if(req.responseCode == 200) {
            LogSuccess("Upload successful");
            Log("Warning: Non-deferred DIRECT-MANUAL is untested", false);
            _scores.Clear();
        } else if (req.responseCode == 202) {
            var res = JsonUtility.FromJson<BatchResponse>(req.downloadHandler.text);
            if(res.success == true) {
                StartCoroutine(ExportReq2(res.body.url));
            } else {
                LogError("Upload failed: " + res.body);
            }
        } else {
            LogError(string.Format("Upload failed ({0}): {1}", req.responseCode, req.error));
        }
    }

    private IEnumerator ExportReq2(string url) {
        yield return new WaitForSeconds(REQ2_DELAY);

        using var req = new UnityWebRequest(url, "GET");
        req.downloadHandler = new DownloadHandlerBuffer();
        
        yield return req.Send();

        if(req.responseCode == 200) {
            var res = JsonUtility.FromJson<BatchResponse2>(req.downloadHandler.text);
            if(res.success == true) {
                LogSuccess("Upload successful");
                _scores.Clear();
            } else {
                LogError("Upload failed");
            }
        } else {
            LogError(string.Format("Upload failed ({0}): {1}", req.responseCode, req.error));
        }
    }

    public void ExportPBs() {
        if(!_cfg.ExportPBs) {
            return;
        }

        var userMusic = Singleton<UserManager>.instance.userMusic;
        var scores = new List<BatchScore>();
        foreach(var x in userMusic.Values) {
            foreach(var y in x.UserFumen) {
                if(y != null) {
                    scores.Add(Util.CreatePB(y));
                }
            }
        }
        var batch = Util.CreateBatch(scores, "inohara-pb");
        using StreamWriter writer = new(Path.Combine(Application.dataPath, "../batch-manual.json"));
        writer.Write(batch);

        Log("Exported PBs to batch-manual.json", false);
    }

    // This is just for fun
    private IEnumerator DrawMessage(string message, Color color) {
        GameObject canvasGO = new() {
            name = "Canvas"
        };
        DontDestroyOnLoad(canvasGO);
        canvasGO.AddComponent<Canvas>();
        canvasGO.AddComponent<CanvasScaler>();
        canvasGO.AddComponent<GraphicRaycaster>();

        Canvas canvas = canvasGO.GetComponent<Canvas>();
        canvas.renderMode = RenderMode.ScreenSpaceOverlay;

        GameObject textGO = new();
        textGO.transform.parent = canvasGO.transform;
        textGO.AddComponent<MU3Text>();
        var text = textGO.GetComponent<MU3Text>();
        text.font = _arial;
        text.text = message;
        text.fontSize = 20;
        text.color = color;
        text.alignment = TextAnchor.UpperCenter;

        RectTransform rectTransform = text.GetComponent<RectTransform>();
        rectTransform.localPosition = new Vector3(0, 0, 0);
        rectTransform.sizeDelta = new Vector2(1080, 1400);

        yield return new WaitForSeconds(DRAW_DURATION);

        Destroy(canvasGO);
        Destroy(text);
    }
}