# <<.Name>>

Built with the Congo framework (Go + HTMX + DaisyUI).

## Commands

```bash
congo dev         # development server (ENV=development, in-memory DB)
congo build       # production binary
congo launch      # deploy to remote server
congo new <name>  # add a new app to the project
congo connect     # SSH into deployed server
congo destroy     # tear down infrastructure
congo claude      # AI-assisted development
congo status      # check deployment health
congo logs        # stream service logs
```

## Architecture

MVC pattern with HTMX-first server rendering.

- `<<.Dir>>/controllers/` — route handlers + template methods
- `<<.Dir>>/models/` — database models with auto-migration ORM
- `<<.Dir>>/views/` — Go HTML templates with DaisyUI
<<- if .WithFrontend>>
- `<<.Dir>>/components/` — React island components
<<- end>>
- `internal/` — vendored Congo framework (modifiable)

## Controller Pattern

```go
// Factory function returns (name, controller).
func Todos() (string, *TodosController) {
    return "todos", &TodosController{}
}

type TodosController struct {
    application.BaseController
}

func (c *TodosController) Setup(app *application.App) {
    c.BaseController.Setup(app)
    http.Handle("GET /todos", app.Serve("todos.html", nil))
    http.Handle("POST /todos", app.Method(c, "Create", nil))
    http.Handle("POST /todos/{id}/delete", app.Method(c, "Delete", nil))
}

// VALUE receiver creates copy for request isolation.
func (c TodosController) Handle(r *http.Request) application.Controller {
    c.Request = r
    return &c
}

// Template methods — accessible as {{todos.All}}.
func (c *TodosController) All() []*models.Todo {
    todos, _ := models.Todos.Search("ORDER BY CreatedAt DESC")
    return todos
}

// POST handler — create.
func (c *TodosController) Create(w http.ResponseWriter, r *http.Request) {
    todo := &models.Todo{Title: r.FormValue("title")}
    if _, err := models.Todos.Insert(todo); err != nil {
        c.RenderError(w, r, err)
        return
    }
    c.Refresh(w, r) // reload current page
}

// POST handler — delete.
func (c *TodosController) Delete(w http.ResponseWriter, r *http.Request) {
    if err := models.Todos.DeleteByID(r.PathValue("id")); err != nil {
        c.RenderError(w, r, err)
        return
    }
    c.Redirect(w, r, "/todos") // navigate to different URL
}
```

Register in `<<.Dir>>/main.go`:
```go
application.WithController(controllers.Todos()),
```

## Model Pattern

```go
// <<.Dir>>/models/todo.go
type Todo struct {
    database.Model  // ID (string UUID), CreatedAt, UpdatedAt
    Title    string
    Done     bool
}
```

Register collection in `<<.Dir>>/models/db.go`:
```go
var Todos = database.Manage(DB, new(Todo))
```

Tables auto-create on startup. New fields auto-migrate. Collection methods: `Get(id)`, `First(where, args...)`, `Search(where, args...)`, `All()`, `Insert(entity)`, `Update(entity)`, `Delete(entity)`, `DeleteByID(id)`, `Count(where, args...)`.

## View + HTMX Pattern

```html
{{template "main.html" .}}
{{define "title"}}Todos{{end}}
{{define "content"}}
<div class="container mx-auto p-8">
    {{range $todo := todos.All}}
    <div class="card bg-base-100 mb-2 p-4 flex justify-between items-center">
        <span>{{$todo.Title}}</span>
        <button hx-post="/todos/{{$todo.ID}}/delete" hx-target="body" class="btn btn-sm btn-error">Delete</button>
    </div>
    {{end}}

    <form hx-post="/todos" hx-target="body" class="flex gap-2 mt-4">
        <input name="title" class="input input-bordered flex-1" placeholder="New todo..." required />
        <button class="btn btn-primary">Add</button>
    </form>
</div>
{{end}}
```

## Key Conventions

- IDs are ALWAYS strings (UUIDs), never integers
- SQL columns use PascalCase: `WHERE UserID = ?`
- Templates by filename only: `{{template "nav.html" .}}` not `"partials/nav.html"`
- `c.Render(w, r, "template.html", data)` — render a partial in POST handlers
- `c.RenderError(w, r, err)` — returns 200 with error HTML for HTMX
- `c.Redirect(w, r, "/path")` — sends HX-Location header for HTMX, 303 for regular requests
- `c.Refresh(w, r)` — sends HX-Refresh header for HTMX, 303 redirect-to-self for regular requests
- `r.PathValue("id")` in handlers, `c.PathValue("id")` in template methods
- HTMX + SameSite=Lax cookies = CSRF protection (no tokens needed)
- No custom ServeMux — all routes on `http.DefaultServeMux`
- `cmp.Or()` for env var defaults

## Application Options

```go
application.WithValue("key", value)         // template function returning value
application.WithMiddleware(mw)              // add middleware
application.WithHealthPath("/healthz")      // custom health endpoint (default: /health)
application.WithController(controllers.X()) // register controller
```