mycroforge/MycroForge.CLI/CodeGen/CrudRouterGenerator.cs

using Humanizer;

namespace MycroForge.CLI.CodeGen;

public class CrudRouterGenerator
{
    private static readonly string[] Template =
    [
        "from typing import Annotated",
        "from fastapi import APIRouter, Depends",
        "from fastapi.responses import JSONResponse",
        "from fastapi.encoders import jsonable_encoder",
        "from %service_import_path% import %service_class_name%",
        "from %create_entity_request_import_path% import %create_entity_request_class_name%",
        "from %update_entity_request_import_path% import %update_entity_request_class_name%",
        "",
        "router = APIRouter()",
        "",
        "@router.get(\"/\")",
        "async def list(",
        "\tservice: Annotated[%service_class_name%, Depends(%service_class_name%)]",
        "):",
        "\ttry:",
        "\t\tresult = await service.list()",
        "\t\treturn JSONResponse(status_code=200, content=jsonable_encoder(result))",
        "\texcept Exception as ex:",
        "\t\tprint(str(ex))",
        "\t\treturn JSONResponse(status_code=500, content=str(ex))",
        "",
        "@router.get(\"/{id}\")",
        "async def get_by_id(",
        "\tid: int,",
        "\tservice: Annotated[%service_class_name%, Depends(%service_class_name%)]",
        "):",
        "\ttry:",
        "\t\tresult = await service.get_by_id(id)",
        "\t\treturn JSONResponse(status_code=200 if result is not None else 404, content=jsonable_encoder(result))",
        "\texcept Exception as ex:",
        "\t\tprint(str(ex))",
        "\t\treturn JSONResponse(status_code=500, content=str(ex))",
        "",
        "@router.post(\"/\")",
        "async def create(",
        "\trequest: Create%entity_class_name%Request,",
        "\tservice: Annotated[%service_class_name%, Depends(%service_class_name%)]",
        "):",
        "\ttry:",
        "\t\tawait service.create(request.model_dump())",
        "\t\treturn JSONResponse(status_code=201, content=None)",
        "\texcept Exception as ex:",
        "\t\tprint(str(ex))",
        "\t\treturn JSONResponse(status_code=500, content=str(ex))",
        "",
        "@router.patch(\"/{id}\")",
        "async def update(",
        "\trequest: Update%entity_class_name%Request,",
        "\tservice: Annotated[%service_class_name%, Depends(%service_class_name%)]",
        "):",
        "\ttry:",
        "\t\tupdated = await service.update(request.model_dump(exclude_unset=True))",
        "\t\treturn JSONResponse(status_code=204 if updated else 404, content=None)",
        "\texcept Exception as ex:",
        "\t\tprint(str(ex))",
        "\t\treturn JSONResponse(status_code=500, content=str(ex))",
        "",
        "@router.delete(\"/{id}\")",
        "async def delete(",
        "\tid: int,",
        "\tservice: Annotated[%service_class_name%, Depends(%service_class_name%)]",
        "):",
        "\ttry:",
        "\t\tdeleted = await service.delete(id)",
        "\t\treturn JSONResponse(status_code=204 if deleted else 404, content=None)",
        "\texcept Exception as ex:",
        "\t\tprint(str(ex))",
        "\t\treturn JSONResponse(status_code=500, content=str(ex))",
    ];

    private readonly ProjectContext _context;

    public CrudRouterGenerator(ProjectContext context)
    {
        _context = context;
    }

    public async Task Generate(string path, string entity)
    {
        var entitySnakeCaseName = entity.Underscore().ToLower();
        var entityClassName = entity.Pascalize();
        var serviceClassName = $"{entityClassName}Service";
        var entityRoutePrefix = entity.Kebaberize().Pluralize().ToLower();

        var servicesFolderPath = $"{Features.Api.FeatureName}/services/{path}";
        var serviceFilePath = $"{servicesFolderPath}/{entitySnakeCaseName}_service.py";
        var serviceImportPath = serviceFilePath
                .Replace('/', '.')
                .Replace('\\', '.')
                .Replace(".py", string.Empty)
                .Trim();

        var routersFolderPath = $"{Features.Api.FeatureName}/routers/{path}";
        var routerFilePath = $"{routersFolderPath}/{entitySnakeCaseName}.py";
        var routerImportPath = routersFolderPath
                .Replace('/', '.')
                .Replace('\\', '.')
                .Trim();

        var requestsFolderPath = $"{Features.Api.FeatureName}/requests/{path}";

        var createRequestImportPath = $"{requestsFolderPath}/Create{entityClassName}Request"
            .Replace('/', '.')
            .Replace('\\', '.')
            .Underscore()
            .ToLower();
        var createRequestClassName = $"Create{entityClassName}Request";

        var updateRequestImportPath = $"{requestsFolderPath}/Update{entityClassName}Request"
            .Replace('/', '.')
            .Replace('\\', '.')
            .Underscore()
            .ToLower();
        var updateRequestClassName = $"Update{entityClassName}Request";

        var router = string.Join("\n", Template)
                .Replace("%service_import_path%", serviceImportPath)
                .Replace("%entity_class_name%", entityClassName)
                .Replace("%service_class_name%", serviceClassName)
                .Replace("%create_entity_request_import_path%", createRequestImportPath)
                .Replace("%create_entity_request_class_name%", createRequestClassName)
                .Replace("%update_entity_request_import_path%", updateRequestImportPath)
                .Replace("%update_entity_request_class_name%", updateRequestClassName);

        await _context.CreateFile(routerFilePath, router);

        var main = await _context.ReadFile("main.py");

        main += string.Join('\n', [
            "",
            $"from {routerImportPath} import {entitySnakeCaseName}",
            $"app.include_router(prefix=\"/{entityRoutePrefix}\", router={entitySnakeCaseName}.router)"
        ]);

        await _context.WriteFile("main.py", main);
    }
}