// // ©2015 - 2022 Candy Smith
// // All rights reserved
// // Redistribution of this software is strictly not allowed.
// // Copy of this software can be obtained from unity asset store only.
// 
// // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// // THE SOFTWARE.

using System.IO;
using System.Reflection;
using BlockPuzzleGameToolkit.TutorialInfo.Scripts;
using UnityEditor;
using UnityEngine;

namespace WordsToolkit.TutorialInfo.Scripts.Editor
{
	[CustomEditor(typeof(Readme))]
	[InitializeOnLoad]
	public class ReadmeEditor : UnityEditor.Editor
	{
		private static readonly string kShowedReadmeSessionStateName = "ReadmeEditor.showedReadme";

		private static readonly float kSpace = 16f;

		static ReadmeEditor()
		{
			EditorApplication.delayCall += SelectReadmeAutomatically;
		}

		private static void SelectReadmeAutomatically()
		{
			if (!SessionState.GetBool(kShowedReadmeSessionStateName, false))
			{
				var readme = SelectReadme();
				SessionState.SetBool(kShowedReadmeSessionStateName, true);

				if (readme && !readme.loadedLayout)
				{
					LoadLayout();
					readme.loadedLayout = true;
				}
			}
		}

		private static void LoadLayout()
		{
			var assembly = typeof(EditorApplication).Assembly;
			var windowLayoutType = assembly.GetType("UnityEditor.WindowLayout", true);
			var method = windowLayoutType.GetMethod("LoadWindowLayout", BindingFlags.Public | BindingFlags.Static);
			method.Invoke(null, new object[] { Path.Combine(Application.dataPath, "TutorialInfo/Layout.wlt"), false });
		}

		[MenuItem("WordConnect/Documentation/ReadMe")]
		private static Readme SelectReadme()
		{
			var ids = AssetDatabase.FindAssets("Readme t:Readme");
			if (ids.Length == 1)
			{
				var readmeObject = AssetDatabase.LoadMainAssetAtPath(AssetDatabase.GUIDToAssetPath(ids[0]));

				Selection.objects = new[] { readmeObject };

				return (Readme)readmeObject;
			}

			Debug.Log("Couldn't find a readme");
			return null;
		}

		protected override void OnHeaderGUI()
		{
			var readme = (Readme)target;
			Init();

			var iconWidth = Mathf.Min(EditorGUIUtility.currentViewWidth / 3f - 20f, 128f);

			GUILayout.BeginHorizontal("In BigTitle");
			{
				GUILayout.Label(readme.icon, GUILayout.Width(iconWidth), GUILayout.Height(iconWidth));
				GUILayout.Label(readme.title, TitleStyle);
			}
			GUILayout.EndHorizontal();
		}

		public override void OnInspectorGUI()
		{
			var readme = (Readme)target;
			Init();

			foreach (var section in readme.sections)
			{
				if (!string.IsNullOrEmpty(section.heading))
				{
					GUILayout.Label(section.heading, HeadingStyle);
				}

				if (!string.IsNullOrEmpty(section.text))
				{
					GUILayout.Label(section.text, BodyStyle);
				}

				if (!string.IsNullOrEmpty(section.linkText))
				{
					if (LinkLabel(new GUIContent(section.linkText)))
					{
						Application.OpenURL(section.url);
					}
				}

				GUILayout.Space(kSpace);
			}
		}


		private bool m_Initialized;

		private GUIStyle LinkStyle => m_LinkStyle;

		[SerializeField]
		private GUIStyle m_LinkStyle;

		private GUIStyle TitleStyle => m_TitleStyle;

		[SerializeField]
		private GUIStyle m_TitleStyle;

		private GUIStyle HeadingStyle => m_HeadingStyle;

		[SerializeField]
		private GUIStyle m_HeadingStyle;

		private GUIStyle BodyStyle => m_BodyStyle;

		[SerializeField]
		private GUIStyle m_BodyStyle;

		private void Init()
		{
			if (m_Initialized)
			{
				return;
			}

			m_BodyStyle = new GUIStyle(EditorStyles.label);
			m_BodyStyle.wordWrap = true;
			m_BodyStyle.fontSize = 14;

			m_TitleStyle = new GUIStyle(m_BodyStyle);
			m_TitleStyle.fontSize = 26;

			m_HeadingStyle = new GUIStyle(m_BodyStyle);
			m_HeadingStyle.fontSize = 18;

			m_LinkStyle = new GUIStyle(m_BodyStyle);
			m_LinkStyle.wordWrap = false;
			// Match selection color which works nicely for both light and dark skins
			m_LinkStyle.normal.textColor = new Color(0x00 / 255f, 0x78 / 255f, 0xDA / 255f, 1f);
			m_LinkStyle.stretchWidth = false;

			m_Initialized = true;
		}

		private bool LinkLabel(GUIContent label, params GUILayoutOption[] options)
		{
			var position = GUILayoutUtility.GetRect(label, LinkStyle, options);

			Handles.BeginGUI();
			Handles.color = LinkStyle.normal.textColor;
			Handles.DrawLine(new Vector3(position.xMin, position.yMax), new Vector3(position.xMax, position.yMax));
			Handles.color = Color.white;
			Handles.EndGUI();

			EditorGUIUtility.AddCursorRect(position, MouseCursor.Link);

			return GUI.Button(position, label, LinkStyle);
		}
	}
}