using System.CommandLine;
using Humanizer;
using MycroForge.CLI.Commands.Interfaces;
using MycroForge.CLI.Extensions;

namespace MycroForge.CLI.Commands;

public partial class MycroForge
{
    public partial class Generate
    {
        public class Service : Command, ISubCommandOf<Generate>
        {
            private static readonly Argument<string> NameArgument =
                new(name: "name", description: "The name of the service");

            private static readonly Option<bool> WithSessionOption =
                new(name: "--with-session", description: "Create a service that uses database sessions");

            private static readonly string[] DefaultTemplate =
            [
                "class %class_name%:",
                "",
                "\tdef hello(self, name: str) -> str:",
                "\t\treturn f\"Hello, {str}!\""
            ];

            private static readonly string[] WithSessionTemplate =
            [
                "from typing import List",
                "from sqlalchemy import select",
                $"from {Features.Db.FeatureName}.engine.async_session import async_session",
                $"# from {Features.Db.FeatureName}.entities.entity import Entity",
                "",
                "class %class_name%:",
                "",
                "\tasync def list(self, value: str) -> List[Entity]:",
                "\t\tasync with async_session() as session:",
                "\t\t\t# stmt = select(User).where(Entity.value == value)",
                "\t\t\t# results = (await session.scalars(stmt)).all()",
                "\t\t\t# return results",
                "\t\t\tpass",
                "\t\treturn []"
            ];

            private readonly ProjectContext _context;

            public Service(ProjectContext context) : base("service", "Generate a service")
            {
                _context = context;
                AddAlias("s");
                AddArgument(NameArgument);
                AddOption(WithSessionOption);
                this.SetHandler(ExecuteAsync, NameArgument, WithSessionOption);
            }

            private async Task ExecuteAsync(string name, bool withSession)
            {
                var folderPath = string.Empty;
                
                if (name.FullyQualifiedName() is { Length: 2} fullName)
                {
                    folderPath = Path.Combine(folderPath, fullName[0]);
                    name = fullName[1];
                }

                var filePath = Path.Combine(folderPath, $"{name.Underscore().ToLower()}.py");
                var className = Path.GetFileName(name).Pascalize();
                var code = string.Join('\n', withSession ? WithSessionTemplate : DefaultTemplate)
                    .Replace("%class_name%", className);

                await _context.CreateFile(filePath, code);
            }
        }
    }
}