003 orisha router showcase

// ============================================================================
// REGRESSION TEST - Orisha Router Showcase
// ============================================================================
// Test: Pattern-branch router transform (the core orisha routing pattern)
// Feature: orisha:router reads pattern branches like [GET /path] and generates
//          inline dispatch code. Tests method matching, path matching, parameter
//          extraction, and catch-all fallback.
// Verifies: Full router transform pipeline — pattern parsing, inline_body
//           generation, branch name escaping, parameter extraction
// ============================================================================

~import "$orisha"
~import "$std/io"

const std = @import("std");

// Test request struct (matches orisha.Request)
const TestRequest = struct {
    method: []const u8,
    path: []const u8,
};

const req_root = TestRequest{ .method = "GET", .path = "/" };
const req_about = TestRequest{ .method = "GET", .path = "/about" };
const req_user = TestRequest{ .method = "GET", .path = "/users/42" };
const req_post = TestRequest{ .method = "POST", .path = "/" };

// Test 1: exact path match
~orisha:router(req: &req_root)
| [GET /] |> std.io:print.ln("matched GET /")
| [GET /about] |> std.io:print.ln("matched GET /about")
| [GET /users/:id] _ |> std.io:print.ln("matched user")
| [*] |> std.io:print.ln("catch-all")

// Test 2: second route match
~orisha:router(req: &req_about)
| [GET /] |> std.io:print.ln("matched GET /")
| [GET /about] |> std.io:print.ln("matched GET /about")
| [GET /users/:id] _ |> std.io:print.ln("matched user")
| [*] |> std.io:print.ln("catch-all")

// Test 3: parameter extraction from path
~orisha:router(req: &req_user)
| [GET /] |> std.io:print.ln("matched GET /")
| [GET /about] |> std.io:print.ln("matched GET /about")
| [GET /users/:id] p |> std.io:print.ln("user={{ p.id:s }}")
| [*] |> std.io:print.ln("catch-all")

// Test 4: catch-all fallback (POST doesn't match any GET route)
~orisha:router(req: &req_post)
| [GET /] |> std.io:print.ln("matched GET /")
| [GET /about] |> std.io:print.ln("matched GET /about")
| [GET /users/:id] _ |> std.io:print.ln("matched user")
| [*] |> std.io:print.ln("catch-all")