using System;
using System.Collections.Generic;
using System.IO;
using Luneraria.Core;
using Luneraria.View;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;

namespace Luneraria.EditorTools
{
    /// <summary>
    /// Screenshots of the G1 map scene with the camera settings of the Godot G2 captures
    /// (../saumwacht-godot/tools/luneraria/g2_views.gd), so both can be compared side by side:
    /// 15 overview, 01 Blau Ancient, 05 Grenzwacht, 06 Bastion, 07 base towers, 10 grotto.
    /// Unity -batchmode -projectPath . -executeMethod Luneraria.EditorTools.LuneWorldCapture.CaptureAll
    /// </summary>
    public static class LuneWorldCapture
    {
        public const int Width = 1920;
        public const int Height = 1080;

        struct View
        {
            public string Label;
            public Vec2 At;
            public float Zoom;
            public int YawSteps;
        }

        public static void CaptureAll()
        {
            int code = 0;
            try
            {
                EditorSceneManager.OpenScene(LuneWorldBuilder.ScenePath, OpenSceneMode.Single);
                var ground = AssetDatabase.LoadAssetAtPath<LuneGround>(LuneWorldBuilder.GroundPath);
                var map = new LuneMap(new LuneBalance());
                Vec2 blue = map.CorePosition(0);
                Vec2 red = map.CorePosition(1);
                Vec2 outer = map.BuildingDef("rot_mid_outer").Position;
                Vec2 inner = map.BuildingDef("rot_mid_inner").Position;
                Vec2 baseA = map.BuildingDef("rot_base_1").Position;
                Vec2 baseB = map.BuildingDef("rot_base_2").Position;
                var views = new List<View>
                {
                    new View { Label = "15-gesamtkarte", At = new Vec2(0, 0), Zoom = LuneCameraMath.OverviewZoom },
                    new View { Label = "01-ancient-100", At = blue + new Vec2(1.0, -1.0), Zoom = 28f, YawSteps = -1 },
                    new View { Label = "05-tower1-grenzwacht", At = outer + new Vec2(0, -2.4), Zoom = 14f },
                    new View { Label = "06-tower2-bastion", At = inner + new Vec2(0, -2.8), Zoom = 14f },
                    new View { Label = "07-basistuerme", At = (baseA + baseB) * .5 * .5 + red * .5, Zoom = 24f, YawSteps = -1 },
                    new View { Label = "10-grotte", At = map.GrottoCenter(), Zoom = 20f },
                };
                string folder = Path.Combine(Path.GetDirectoryName(Application.dataPath), "docs/port/screenshots/u2b");
                Directory.CreateDirectory(folder);
                Camera camera = Camera.main;
                foreach (View view in views)
                {
                    // Godot: look_at_point clamps the focus and puts it on the ground under it.
                    var focus = new Vec2(Mathf.Clamp((float)view.At.X, -LuneCameraMath.FocusLimit, LuneCameraMath.FocusLimit), Mathf.Clamp((float)view.At.Y, -LuneCameraMath.FocusLimit, LuneCameraMath.FocusLimit));
                    Vector3 point = LuneSpace.World(focus, ground.StandHeight(focus));
                    LuneCameraMath.Pose(point, view.Zoom, view.YawSteps * Mathf.PI * .25f, out Vector3 position, out Quaternion rotation);
                    camera.transform.SetPositionAndRotation(position, rotation);
                    Render(camera, Path.Combine(folder, view.Label + ".png"));
                }
            }
            catch (Exception error)
            {
                Debug.LogError("LUNE_CAPTURE failed: " + error);
                code = 1;
            }
            EditorApplication.Exit(code);
        }

        public static void Render(Camera camera, string file)
        {
            var target = new RenderTexture(Width, Height, 24, RenderTextureFormat.ARGB32) { antiAliasing = 4 };
            camera.aspect = (float)Width / Height;
            camera.targetTexture = target;
            camera.Render();
            RenderTexture.active = target;
            var image = new Texture2D(Width, Height, TextureFormat.RGB24, false);
            image.ReadPixels(new Rect(0, 0, Width, Height), 0, 0);
            image.Apply();
            File.WriteAllBytes(file, image.EncodeToPNG());
            RenderTexture.active = null;
            camera.targetTexture = null;
            UnityEngine.Object.DestroyImmediate(target);
            UnityEngine.Object.DestroyImmediate(image);
            Debug.Log("LUNE_CAPTURE wrote " + file);
        }

        /// <summary>
        /// U5 vertical slice: the Mid-Lane of the target-quality zone (docs/port/U5-VISUAL.md).
        /// Godot G3 comparison shots live in ../saumwacht-godot/docs/luneraria/screenshots/g3/.
        /// Unity -batchmode -projectPath . -executeMethod Luneraria.EditorTools.LuneWorldCapture.CaptureMidLane
        /// </summary>
        public static void CaptureMidLane()
        {
            int code = 0;
            try
            {
                EditorSceneManager.OpenScene(LuneWorldBuilder.ScenePath, OpenSceneMode.Single);
                var ground = AssetDatabase.LoadAssetAtPath<LuneGround>(LuneWorldBuilder.GroundPath);
                var map = new LuneMap(new LuneBalance());
                Vec2 blue = map.CorePosition(0);
                Vec2 red = map.CorePosition(1);
                Vec2 outer = map.BuildingDef("rot_mid_outer").Position;
                Vec2 inner = map.BuildingDef("rot_mid_inner").Position;
                var views = new List<View>
                {
                    new View { Label = "mid-lane-overview", At = (outer + inner) * .5, Zoom = 30f },
                    new View { Label = "mid-lane-towers", At = outer + new Vec2(0, -2.5), Zoom = 16f },
                    new View { Label = "mid-lane-ancient", At = blue + new Vec2(1.5, -2.5), Zoom = 24f, YawSteps = -1 },
                    new View { Label = "mid-lane-grotto", At = map.GrottoCenter(), Zoom = 22f },
                    new View { Label = "mid-lane-wide", At = (blue + red) * .5, Zoom = 48f, YawSteps = -1 },
                    // Weg 2 edge tier: the mountains beyond the lane corridor keep colour and stone relief.
                    new View { Label = "edge-mountains", At = new Vec2(-55, 55), Zoom = 36f, YawSteps = -1 },
                    new View { Label = "lane-and-edge", At = new Vec2(-28, 28), Zoom = 56f },
                };
                string folder = Path.Combine(Path.GetDirectoryName(Application.dataPath), "docs/port/screenshots/u5");
                Directory.CreateDirectory(folder);
                Camera camera = Camera.main;
                foreach (View view in views)
                {
                    var focus = new Vec2(Mathf.Clamp((float)view.At.X, -LuneCameraMath.FocusLimit, LuneCameraMath.FocusLimit), Mathf.Clamp((float)view.At.Y, -LuneCameraMath.FocusLimit, LuneCameraMath.FocusLimit));
                    Vector3 point = LuneSpace.World(focus, ground.StandHeight(focus));
                    LuneCameraMath.Pose(point, view.Zoom, view.YawSteps * Mathf.PI * .25f, out Vector3 position, out Quaternion rotation);
                    camera.transform.SetPositionAndRotation(position, rotation);
                    Render(camera, Path.Combine(folder, view.Label + ".png"));
                }
            }
            catch (Exception error)
            {
                Debug.LogError("LUNE_CAPTURE mid failed: " + error);
                code = 1;
            }
            EditorApplication.Exit(code);
        }
    }
}