using UnityEngine;
using System.Collections.Generic;
using UnityEngine.UI;
using System;
using Unity.Sample.Core;

public class ConsoleGUI : MonoBehaviour, IConsoleUI
{
#pragma warning disable 649
    [ConfigVar(Name = "console.alpha", DefaultValue = "0.9", Description = "Alpha of console")]
    static ConfigVar consoleAlpha;
#pragma warning restore 649

    void Awake()
    {
        input_field.onEndEdit.AddListener(OnSubmit);
    }

    public void Init(string buildId, string buildUnityVersion)
    {
        buildIdText.text = buildId + " - " + buildUnityVersion;
    }

    public void Shutdown()
    {
    }

    public void OutputString(string s)
    {
        if (s.Length > 128) s = s.Substring(0, 128) + " <...>";
        m_Lines.Add(s);
        var count = Mathf.Min(100, m_Lines.Count);
        var start = m_Lines.Count - count;



        try // Workaround for log output from jobs
        {
            text_area.text = string.Join("\n", m_Lines.GetRange(start, count).ToArray());
        }
        catch (Exception)
        {}

    }

    public bool IsOpen()
    {
        return panel.gameObject.activeSelf;
    }

    public void SetOpen(bool open)
    {
        GatedInput.SetBlock(GatedInput.Blocker.Console, open);

        panel.gameObject.SetActive(open);
        if (open)
        {
            input_field.ActivateInputField();
        }
    }

    public void ConsoleUpdate()
    {
        if (Input.GetKeyDown(toggle_console_key) || Input.GetKeyDown(KeyCode.Backslash))
            SetOpen(!IsOpen());

        if (!IsOpen())
            return;

        var c = text_area_background.color;
        c.a = Mathf.Clamp01(consoleAlpha.FloatValue);
        text_area_background.color = c;

        // This is to prevent clicks outside input field from removing focus
        input_field.ActivateInputField();

        if (Input.GetKeyDown(KeyCode.Tab))
        {
            if (input_field.caretPosition == input_field.text.Length && input_field.text.Length > 0)
            {
                var res = Console.TabComplete(input_field.text);
                input_field.text = res;
                input_field.caretPosition = res.Length;
            }
        }
        else if (Input.GetKeyDown(KeyCode.UpArrow))
        {
            input_field.text = Console.HistoryUp(input_field.text);
            m_WantedCaretPosition = input_field.text.Length;
        }
        else if (Input.GetKeyDown(KeyCode.DownArrow))
        {
            input_field.text = Console.HistoryDown();
            input_field.caretPosition = input_field.text.Length;
        }
    }

    public void ConsoleLateUpdate()
    {
        // This has to happen here because keys like KeyUp will navigate the caret
        // int the UI event handling which runs between Update and LateUpdate
        if (m_WantedCaretPosition > -1)
        {
            input_field.caretPosition = m_WantedCaretPosition;
            m_WantedCaretPosition = -1;
        }
    }

    void OnSubmit(string value)
    {
        // Only react to this if enter was actually pressed. Submit can also happen by mouseclicks.
        if (!Input.GetKey(KeyCode.Return) && !Input.GetKey(KeyCode.KeypadEnter))
            return;

        input_field.text = "";
        input_field.ActivateInputField();

        Console.EnqueueCommand(value);
    }

    public void SetPrompt(string prompt)
    {
    }

    List<string> m_Lines = new List<string>();
    int m_WantedCaretPosition = -1;


#pragma warning disable 649
    [SerializeField] Transform panel;
    [SerializeField] InputField input_field;
    [SerializeField] Text text_area;
    [SerializeField] Image text_area_background;
    [SerializeField] KeyCode toggle_console_key;
    [SerializeField] Text buildIdText;
#pragma warning restore 649
}