using Matrix42.Extensions.Scaffolder.Core.ProjectGenerators;
using System;
using System.Collections.Generic;
using System.IO;

namespace Matrix42.Extensions.Scaffolder.Core;

public sealed class ExtensionScaffolder : IExtensionScaffolder
{
	private readonly DefaultProjectGenerator _projectGenerator = new();

	public IReadOnlyList<string> Generate(ExtensionScaffoldingOptions options)
	{
		if (options is null)
			throw new ArgumentNullException(nameof(options));


		if (string.IsNullOrWhiteSpace(options.ExtensionPath)) throw new ArgumentException("ExtensionPath must be set.", nameof(options));

		if (string.IsNullOrWhiteSpace(options.ExtensionNamespace)) throw new ArgumentException("ExtensionNamespace must be set.", nameof(options));

		if (options.Projects == null) throw new ArgumentException("Projects must be set.", nameof(options));

		var result = new List<string>();

		PrepareRootStructure(options);
		PrepareBasePackage(options);
		var solutionDir = PrepareSolutionFolder(options);
		PrepareRootArtifacts(options);
		PrepareSolutionFiles(options, solutionDir);

		foreach (var def in options.Projects)
		{
			var csprojPath = _projectGenerator.GenerateProject(options, def);
			result.Add(csprojPath);
		}

		GenerateSolutionFile(options, solutionDir, result);

		return result;
	}

	private void PrepareRootStructure(ExtensionScaffoldingOptions options)
	{
		Directory.CreateDirectory(options.ExtensionPath);
	}

	private void PrepareBasePackage(ExtensionScaffoldingOptions options)
	{
		var basePackageDir = Path.Combine(options.ExtensionPath, "BasePackage");
		Directory.CreateDirectory(basePackageDir);

		var packageJsonPath = Path.Combine(basePackageDir, "package.json");
		if (!File.Exists(packageJsonPath))
		{
			var json = GetDefaultPackageJson(options);
			File.WriteAllText(packageJsonPath, json);
		}
	}

	/// <summary>
	/// Creates /Solutions/{ns} and returns that path (solution-level folder).
	/// </summary>
	private string PrepareSolutionFolder(ExtensionScaffoldingOptions options)
	{
		var solutionDir = Path.Combine(options.ExtensionPath, "Solutions", options.ExtensionNamespace);
		Directory.CreateDirectory(solutionDir);
		return solutionDir;
	}

	private void PrepareRootArtifacts(ExtensionScaffoldingOptions options)
	{
		/*var azurePath = Path.Combine(options.ExtensionPath, "azure-pipelines-ci.yml");
		if (!File.Exists(azurePath))
		{
			File.WriteAllText(azurePath, Templates.AzurePipelinesYml);
		}*/

		var azurePath = Path.Combine(options.ExtensionPath, "azure-pipelines-ci.yaml");
		if (!File.Exists(azurePath))
		{
			var repoName = new DirectoryInfo(options.ExtensionPath).Name;

			var content = Templates.GetAzurePiplineCi();
			var replacedContent = content.Replace("{repoName}", repoName).Replace("{ns}", options.ExtensionNamespace);
			File.WriteAllText(azurePath, replacedContent);
		}

		var gitignorePath = Path.Combine(options.ExtensionPath, ".gitignore");
		if (!File.Exists(gitignorePath))
		{
			File.WriteAllText(gitignorePath, Templates.Gitignore);
		}

		/*var veracodePath = Path.Combine(options.ExtensionPath, "PrepareVeracodeScan.cmd");
		if (!File.Exists(veracodePath))
		{
			var content = Templates.PrepareVeracodeScanCmd.Replace("{ns}", options.ExtensionNamespace);
			File.WriteAllText(veracodePath, content);
		}*/

		var targetsPath = Path.Combine(options.ExtensionPath, "Extension.Assemblies.targets");
		if (!File.Exists(targetsPath))
		{
			var content = Templates.GetMatrix42AssembliesTargets();
			File.WriteAllText(targetsPath, content);
		}
	}

	/// <summary>
	/// Solution-level files that should live next to the .sln (e.g. BuildEvent.cmd).
	/// </summary>
	private void PrepareSolutionFiles(ExtensionScaffoldingOptions options, string solutionDir)
	{
		var buildEventPath = Path.Combine(solutionDir, "BuildEvent.cmd");
		if (!File.Exists(buildEventPath))
		{
			var content = Templates.BuildEventCmdTemplate.Replace("{ns}", options.ExtensionNamespace);
			File.WriteAllText(buildEventPath, content);
		}

		// If later you want to actually create the .sln here (for console scenario),
		// this is the right place as well.
	}

	private static string GetDefaultPackageJson(ExtensionScaffoldingOptions options) =>
$@"{{
  ""Id"": ""{options.ExtensionId}"",
  ""Vendor"": ""Not Specified"",
  ""Name"": ""{options.ExtensionNamespace}"",
  ""Version"": ""1.0"",
  ""Prerequisites"": {{
		""MinimalRequiredProductVersion"": ""26.1.0"",
		""DependentPackages"": []
	}},
	""SetupDirectives"": {{
    ""MaintenanceMode"": false,
    ""RecycleWebApplication"": false,
    ""RestartM42WindowsServices"": false
  }},
  ""Sandboxed"": true
}}";

	/// <summary>
	/// Creates {ns}.sln under solutionDir and adds all csproj files to it.
	/// </summary>
	private void GenerateSolutionFile(
			ExtensionScaffoldingOptions options,
			string solutionDir,
			IReadOnlyList<string> projectPaths)
	{
		if (projectPaths == null || projectPaths.Count == 0)
			return;

		var solutionName = options.ExtensionNamespace;
		var slnPath = Path.Combine(solutionDir, solutionName + ".sln");

		// Basic VS solution header
		var lines = new List<string>();
		lines.Add("Microsoft Visual Studio Solution File, Format Version 12.00");
		lines.Add("# Visual Studio Version 17");
		lines.Add("VisualStudioVersion = 17.0.31912.275");
		lines.Add("MinimumVisualStudioVersion = 10.0.40219.1");

		// C# project type GUID
		const string csProjTypeGuid = "{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}";

		// Collect project GUIDs
		var projectEntries = new List<Tuple<string, string, string>>();
		// (projGuid, projName, relativePath)

		foreach (var projPath in projectPaths)
		{
			var projName = Path.GetFileNameWithoutExtension(projPath);
			var relativePath = GetRelativePath(solutionDir, projPath);
			var projGuid = "{" + Guid.NewGuid().ToString().ToUpperInvariant() + "}";

			projectEntries.Add(Tuple.Create(projGuid, projName, relativePath));

			lines.Add(string.Format(
					"Project(\"{0}\") = \"{1}\", \"{2}\", \"{3}\"",
					csProjTypeGuid,
					projName,
					relativePath,
					projGuid));
			lines.Add("EndProject");
		}

		// Global section (configs + project configs)
		lines.Add("Global");
		lines.Add("\tGlobalSection(SolutionConfigurationPlatforms) = preSolution");
		lines.Add("\t\tDebug|Any CPU = Debug|Any CPU");
		lines.Add("\t\tRelease|Any CPU = Release|Any CPU");
		lines.Add("\tEndGlobalSection");

		lines.Add("\tGlobalSection(ProjectConfigurationPlatforms) = postSolution");
		foreach (var entry in projectEntries)
		{
			var guid = entry.Item1;
			lines.Add(string.Format("\t\t{0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU", guid));
			lines.Add(string.Format("\t\t{0}.Debug|Any CPU.Build.0 = Debug|Any CPU", guid));
			lines.Add(string.Format("\t\t{0}.Release|Any CPU.ActiveCfg = Release|Any CPU", guid));
			lines.Add(string.Format("\t\t{0}.Release|Any CPU.Build.0 = Release|Any CPU", guid));
		}
		lines.Add("\tEndGlobalSection");

		lines.Add("\tGlobalSection(SolutionProperties) = preSolution");
		lines.Add("\t\tHideSolutionNode = FALSE");
		lines.Add("\tEndGlobalSection");

		lines.Add("EndGlobal");

		File.WriteAllLines(slnPath, lines);
	}

	/// <summary>
	/// Simple helper to get relative path from one folder to a file.
	/// </summary>
	private static string GetRelativePath(string basePath, string fullPath)
	{
		var baseUri = new Uri(AppendDirectorySeparatorChar(basePath));
		var fullUri = new Uri(fullPath);
		var relative = baseUri.MakeRelativeUri(fullUri).ToString();

		return relative.Replace('/', Path.DirectorySeparatorChar);
	}

	private static string AppendDirectorySeparatorChar(string path)
	{
		return !path.EndsWith(Path.DirectorySeparatorChar.ToString()) ? path + Path.DirectorySeparatorChar : path;
	}
}