namespace MicroForge.CLI.Features;

public sealed class Api : IFeature
{
    #region Main

    private static readonly string[] HelloRouter =
    [
        "from fastapi import APIRouter",
        "from fastapi.responses import JSONResponse",
        "from fastapi.encoders import jsonable_encoder",
        "",
        "router = APIRouter()",
        "",
        "@router.get(\"/{name}\")",
        "async def greet(name: str):",
        "\treturn JSONResponse(status_code=200, content=jsonable_encoder({'greeting': f\"Hello, {name}!\"}))"
    ];

    private static readonly string[] Main =
    [
        "from fastapi import FastAPI",
        "app = FastAPI()",
        "",
        "from api.routers import hello",
        "app.include_router(prefix=\"/hello\", router=hello.router)"
    ];

    #endregion

    public const string FeatureName = "api";

    public string Name => FeatureName;

    public async Task ExecuteAsync(ProjectContext context)
    {
        if (context.Config.Features.Contains(FeatureName))
        {
            Console.WriteLine($"Feature {FeatureName} has already been initialized.");
            return;
        }

        Console.WriteLine(string.Join("\n", [
            $"Adding feature {FeatureName}",
            "Requirements:",
            " - fastapi",
            " - uvicorn[standard]",
        ]));

        await Bash.ExecuteAsync(
            "source .venv/bin/activate",
            "python3 -m pip install fastapi uvicorn[standard]",
            "python3 -m pip freeze > requirements.txt"
        );

        await context.CreateFile("api/routers/hello.py", HelloRouter);

        var main = await context.ReadFile("main.py");
        main = string.Join('\n', Main) + main;
        await context.WriteFile("main.py", main);

        context.Config.Features.Add(FeatureName);
    }
}