using Godot;
using Godot.Collections; // Required for Godot's built-in JSON parser

namespace IslaApocalypse.Core // Change this if your namespace is different
{
	public static class ConfigManager
	{
		// Default Fallbacks
		// public static int WorldSeed = 1063685222;
		public static int WorldSeed = (int)GD.Randi(); // if 0 also randomizes
		public static int MapSize = 8192;
		public static float CraterRadius = 400f;
		public static float DensityMultiplier = 1.0f; // <-- Replaces TownCount
		public static int ChunkRadius = 24; // Default chunk size, can be overridden by config

		// Iteration toggle: skip the ~25-min A* road pass entirely. The blueprint is
		// still exported (road sections present but empty) — an iteration artifact,
		// not a shippable world. Default false.
		public static bool SkipRoads = false;

		// Sea-level model (D-033, terrain-water task 04): "flat" = one scalar sea
		// level everywhere (SeaLevelValue); "field" = the legacy latitude Lerp
		// (0.26 north .. 0.15 south). Generator-only — the runtime never computes
		// sea level. Default: flat 0.15.
		public static string SeaLevelModel = "flat";
		public static float SeaLevelValue = 0.15f;

		// Height-redistribution curve (tasks 05/06/07, graduation M-7): "v3" applies
		// the terraced-ascent curve with the per-seed peak spike (HeightCurve.cs);
		// "off" is the raw legacy profile. "v1"/"v2" were retired by their successor
		// recalibrations (old blueprints are regenerable). Biome classification is
		// curve-invariant by construction either way. Default: v3.
		public static string TerrainCurve = "v3";

		public static void LoadConfig()
		{
			string path = "res://ServerConfig.json";

			if (!FileAccess.FileExists(path))
			{
				GD.PrintErr("[ConfigManager] ServerConfig.json not found! Defaulting to 8K.");
				return;
			}

			// Read the file
			using var file = FileAccess.Open(path, FileAccess.ModeFlags.Read);
			string content = file.GetAsText();
			
			// Parse the JSON
			var json = new Json();
			var error = json.Parse(content);
			if (error != Error.Ok)
			{
				GD.PrintErr($"[ConfigManager] JSON Parse Error: {json.GetErrorMessage()}");
				return;
			}

			var data = (Dictionary)json.Data;

			// Extract the Seed
			if (data.ContainsKey("WorldSeed"))
			{
				WorldSeed = (int)data["WorldSeed"];
			}

			// Extract the MapProfile and run your Switch/Case logic!
			string profile = "8K";
			if (data.ContainsKey("MapProfile"))
			{
				profile = (string)data["MapProfile"];
			}

			// Extract the TownDensity and run your Switch/Case logic!
			string townDensity = "Normal";
			if (data.ContainsKey("TownDensity"))
			{
				townDensity = (string)data["TownDensity"];
			}
			// Extract the ChunkRadius
			if (data.ContainsKey("ChunkRadius"))            {
				ChunkRadius = (int)data["ChunkRadius"];
			}

			// Extract the SkipRoads iteration toggle
			if (data.ContainsKey("SkipRoads"))
			{
				SkipRoads = (bool)data["SkipRoads"];
			}

			// Extract the sea-level model
			if (data.ContainsKey("SeaLevelModel"))
			{
				string model = (string)data["SeaLevelModel"];
				if (model == "flat" || model == "field")
					SeaLevelModel = model;
				else
					GD.PrintErr($"[ConfigManager] Unknown SeaLevelModel '{model}'. Keeping '{SeaLevelModel}'.");
			}
			if (data.ContainsKey("SeaLevelValue"))
			{
				SeaLevelValue = (float)data["SeaLevelValue"];
			}

			// Extract the terrain-curve gate
			if (data.ContainsKey("TerrainCurve"))
			{
				string curve = (string)data["TerrainCurve"];
				if (curve == "off" || curve == "v3")
					TerrainCurve = curve;
				else if (curve == "v1" || curve == "v2")
					GD.PrintErr($"[ConfigManager] TerrainCurve '{curve}' was retired by a later recalibration (v3, task 07). Keeping '{TerrainCurve}' — use \"v3\" or \"off\".");
				else
					GD.PrintErr($"[ConfigManager] Unknown TerrainCurve '{curve}'. Keeping '{TerrainCurve}'.");
			}

			switch (profile)
			{
				case "4K":
					MapSize = 4096;
					CraterRadius = 400f; // Scaled down crater
					break;
				case "6K":
					MapSize = 6144;
					CraterRadius = 600f;
					break;
				case "8K":
					MapSize = 8192;
					CraterRadius = 800f; // Your original crater size spread over an 8K map
					break;
				case "10K":
					MapSize = 10240;
					CraterRadius = 1000f;
					break;
				default:
					GD.PrintErr($"[ConfigManager] Unknown MapProfile '{profile}'. Defaulting to 8K.");
					MapSize = 8192;
					CraterRadius = 800f;
					break;
			}

			switch (townDensity)
			{
				case "Sparse":
					DensityMultiplier = 0.5f;
					break;
				case "Normal":
					DensityMultiplier = 1.0f;
					break;
				case "Dense":
					DensityMultiplier = 2.0f;
					break;
				default:
					GD.PrintErr($"[ConfigManager] Unknown TownDensity '{townDensity}'. Defaulting to Normal.");
					DensityMultiplier = 1.0f;
					break;
			}
			
			GD.Print($"[ConfigManager] Successfully loaded {profile} Profile. MapSize set to {MapSize}.");
		}
	}
}