actr-web-protoc-codegen 0.3.1

//! Web code generator — produces all build artifacts from a `WebCodegenRequest`.
//!
//! Generated artifacts:
//! - `src/generated/actr-config.ts`  — Configuration from actr.toml
//! - `src/generated/*.actorref.ts`   — Typed ActorRef wrappers
//! - `src/generated/index.ts`        — Re-exports
//! - `wasm/`                         — Rust WASM crate (Cargo.toml, build.sh, src/lib.rs, handlers)
//! - `public/actor.sw.js`            — Service Worker entry (config from DOM_PORT_INIT)
//! - `build.sh`                      — Root build script

use crate::request::{FileInfo, ServiceInfo, WebCodegenRequest, WebCodegenResponse};
use heck::{ToKebabCase, ToLowerCamelCase, ToSnakeCase};
use std::collections::HashMap;
use std::path::{Path, PathBuf};
use tracing::info;

/// Run the full code generation pipeline.
pub fn generate(request: &WebCodegenRequest) -> WebCodegenResponse {
    match generate_inner(request) {
        Ok(files) => WebCodegenResponse {
            success: true,
            generated_files: files,
            errors: Vec::new(),
        },
        Err(e) => WebCodegenResponse {
            success: false,
            generated_files: Vec::new(),
            errors: vec![e],
        },
    }
}

fn generate_inner(req: &WebCodegenRequest) -> Result<Vec<PathBuf>, String> {
    let mut generated = Vec::new();

    // 1. actr-config.ts
    let config_path = req.output_dir.join("actr-config.ts");
    let config_content = gen_actr_config(req)?;
    write_file(&config_path, &config_content)?;
    generated.push(config_path);

    // 2. ActorRef wrappers for local services
    for svc in &req.local_services {
        let file_name = format!("{}.actorref.ts", to_kebab_case(&svc.name));
        let ref_path = req.output_dir.join(&file_name);
        let ref_content = gen_actor_ref(svc, req)?;
        write_file(&ref_path, &ref_content)?;
        generated.push(ref_path);
    }

    // 3. index.ts
    let index_path = req.output_dir.join("index.ts");
    let index_content = gen_index(req)?;
    write_file(&index_path, &index_content)?;
    generated.push(index_path);

    // 4. wasm/ scaffold
    let wasm_files = gen_wasm_scaffold(req)?;
    generated.extend(wasm_files);

    // 5. public/actor.sw.js
    let sw_path = req.project_root.join("public/actor.sw.js");
    let sw_content = gen_service_worker(req)?;
    write_file(&sw_path, &sw_content)?;
    generated.push(sw_path);

    // 6. Root build.sh (only if not already present)
    let build_sh = req.project_root.join("build.sh");
    if !build_sh.exists() {
        let build_content = gen_root_build_sh();
        write_file(&build_sh, &build_content)?;
        make_executable(&build_sh)?;
        generated.push(build_sh);
    }

    Ok(generated)
}

// ═══════════════════════════════════════════════════════════════════
// actr-config.ts
// ═══════════════════════════════════════════════════════════════════

fn gen_actr_config(req: &WebCodegenRequest) -> Result<String, String> {
    let manufacturer = &req.manufacturer;
    let actr_name = &req.actr_name;
    let signaling_url = &req.signaling_url;
    let realm_id = req.realm_id;

    let edition = req.edition();
    let exports = req.exports_list();
    let platform_web = req.platform_web();
    let raw_acl = req.raw_acl();

    // Dependencies
    let mut dep_entries = Vec::new();
    for dep in &req.dependencies {
        if let Some(ref at) = dep.actr_type {
            dep_entries.push(format!(
                "  '{}': {{ actr_type: '{}:{}:{}' }},",
                dep.alias, at.manufacturer, at.name, at.version
            ));
        } else {
            dep_entries.push(format!("  '{}': {{}},", dep.alias));
        }
    }

    // Connection role is negotiated per-peer at runtime, so every actor
    // exports the same symbol regardless of typical initiator/acceptor role.
    let type_export_name = "actrType";

    let mut out = String::new();
    out.push_str(
        "/**\n * Auto-generated Actr configuration\n * Source: actr.toml\n *\n * DO NOT EDIT this file manually\n */\n\n",
    );
    out.push_str("import type { ActorClientConfig, SwRuntimeConfig } from '@actr/web';\n\n");

    // Edition
    out.push_str("// ── Full actr.toml info ──\n\n");
    out.push_str(&format!(
        "/** actr.toml edition */\nexport const edition = {edition};\n\n"
    ));

    // Exports
    out.push_str("/** Exported proto files */\n");
    if exports.is_empty() {
        out.push_str("export const exports: string[] = [];\n\n");
    } else {
        out.push_str(&format!(
            "export const exports = [{}];\n\n",
            exports
                .iter()
                .map(|e| format!("'{e}'"))
                .collect::<Vec<_>>()
                .join(", ")
        ));
    }

    // Package info
    let authors_js: Vec<String> = req.authors.iter().map(|a| format!("'{a}'")).collect();
    let tags_js: Vec<String> = req.tags.iter().map(|t| format!("'{t}'")).collect();
    out.push_str("/** Package info */\n");
    out.push_str("export const packageInfo = {\n");
    out.push_str(&format!("  name: '{}',\n", req.package_name));
    out.push_str(&format!("  description: '{}',\n", req.description));
    out.push_str(&format!("  authors: [{}],\n", authors_js.join(", ")));
    out.push_str(&format!("  license: '{}',\n", req.license));
    out.push_str(&format!("  tags: [{}],\n", tags_js.join(", ")));
    out.push_str("} as const;\n\n");

    // ActrType
    let version = &req.version;
    out.push_str("/** ActrType */\n");
    out.push_str(&format!("export const {type_export_name} = {{\n"));
    out.push_str(&format!("  manufacturer: '{manufacturer}',\n"));
    out.push_str(&format!("  name: '{actr_name}',\n"));
    out.push_str(&format!("  version: '{version}',\n"));
    out.push_str(&format!(
        "  fullType: '{manufacturer}:{actr_name}:{version}',\n"
    ));
    out.push_str("} as const;\n\n");

    // Dependencies
    out.push_str("/** Dependencies */\n");
    if dep_entries.is_empty() {
        out.push_str("export const dependencies = {} as const;\n\n");
    } else {
        out.push_str("export const dependencies = {\n");
        for entry in &dep_entries {
            out.push_str(entry);
            out.push('\n');
        }
        out.push_str("} as const;\n\n");
    }

    // Platform.web
    if let Some(pw) = &platform_web {
        out.push_str("/** Web platform config */\n");
        out.push_str("export const platform = {\n  web: ");
        out.push_str(&format_toml_as_ts(pw, 2));
        out.push_str(",\n} as const;\n\n");
    }

    // System config
    out.push_str("/** System config */\n");
    out.push_str("export const system = {\n");
    out.push_str("  signaling: {\n");
    out.push_str(&format!(
        "    url: '{}',\n",
        signaling_url.trim_end_matches('/')
    ));
    out.push_str("  },\n");
    out.push_str("  deployment: {\n");
    out.push_str(&format!("    realm_id: {realm_id},\n"));
    if !req.ais_endpoint.is_empty() {
        out.push_str(&format!("    ais_endpoint: '{}',\n", req.ais_endpoint));
    }
    out.push_str("  },\n");
    out.push_str("  discovery: {\n");
    out.push_str(&format!("    visible: {},\n", req.visible_in_discovery));
    out.push_str("  },\n");
    out.push_str("  observability: {\n");
    out.push_str(&format!(
        "    filter_level: '{}',\n",
        req.observability.filter_level
    ));
    out.push_str(&format!(
        "    tracing_enabled: {},\n",
        req.observability.tracing_enabled
    ));
    if req.observability.tracing_enabled {
        out.push_str(&format!(
            "    tracing_endpoint: '{}',\n",
            req.observability.tracing_endpoint
        ));
        out.push_str(&format!(
            "    tracing_service_name: '{}',\n",
            req.observability.tracing_service_name
        ));
    }
    out.push_str("  },\n");
    out.push_str(&format!(
        "  webrtc: {{\n    force_relay: {},\n",
        req.force_relay
    ));
    if !req.stun_urls.is_empty() {
        out.push_str(&format!(
            "    stun_urls: [{}],\n",
            req.stun_urls
                .iter()
                .map(|u| format!("'{u}'"))
                .collect::<Vec<_>>()
                .join(", ")
        ));
    }
    if !req.turn_urls.is_empty() {
        out.push_str(&format!(
            "    turn_urls: [{}],\n",
            req.turn_urls
                .iter()
                .map(|u| format!("'{u}'"))
                .collect::<Vec<_>>()
                .join(", ")
        ));
    }
    out.push_str("  },\n");
    out.push_str("} as const;\n\n");

    // ACL
    if let Some(acl_val) = &raw_acl {
        out.push_str("/** ACL config */\n");
        out.push_str("export const acl = ");
        out.push_str(&format_toml_as_ts(acl_val, 0));
        out.push_str(" as const;\n\n");
    } else {
        out.push_str("/** ACL config */\n");
        out.push_str("export const acl = {} as const;\n\n");
    }

    // runtimeConfig
    let client_actr_type = req.client_actr_type();
    let target_actr_type = req.target_actr_type();
    let acl_allow = req.get_acl_allow_types();
    let acl_allow_js: Vec<String> = acl_allow.iter().map(|t| format!("'{t}'")).collect();

    // package_url: default `.actr` package path under public/packages/.
    // The basename is always `req.package_name` — there is no longer a
    // server-vs-client split on the filename, because the guest-bridge
    // runtime is the only loader path.
    let package_url = format!("/packages/{}.actr", req.package_name);

    // runtime_wasm_url always points at the shared SW runtime WASM. Every
    // actor (initiator or acceptor) uses the guest-bridge runtime.
    let wasm_name = req.wasm_module_name();
    let runtime_wasm_url = format!("/packages/{wasm_name}_bg.wasm");

    out.push_str("// ── runtimeConfig (passed to Service Worker WASM registration) ──\n\n");
    out.push_str("/**\n * Service Worker runtime config\n * Passed from main thread to Service Worker via DOM_PORT_INIT\n */\n");
    out.push_str("export const runtimeConfig: SwRuntimeConfig = {\n");
    if !req.ais_endpoint.is_empty() {
        out.push_str(&format!("  ais_endpoint: '{}',\n", req.ais_endpoint));
    }
    out.push_str("  signaling_url: system.signaling.url,\n");
    out.push_str("  realm_id: system.deployment.realm_id,\n");
    out.push_str(&format!("  client_actr_type: '{client_actr_type}',\n"));
    out.push_str(&format!("  target_actr_type: '{target_actr_type}',\n"));
    out.push_str("  service_fingerprint: '',\n");
    out.push_str(&format!(
        "  acl_allow_types: [{}],\n",
        acl_allow_js.join(", ")
    ));
    out.push_str(&format!("  package_url: '{package_url}',\n"));
    out.push_str(&format!("  runtime_wasm_url: '{runtime_wasm_url}',\n"));
    out.push_str("  // Trust anchors — pubkey_b64 is substituted by deploy tooling.\n");
    out.push_str("  trust: [{ kind: 'static', pubkey_b64: '__MFR_PUBKEY_PLACEHOLDER__' }],\n");
    out.push_str("};\n\n");

    // ActorClientConfig
    // Every actor — whether it typically initiates or accepts — needs the
    // same peer-side knobs. Role is negotiated per-peer at connect time.
    out.push_str("// ── ActorClientConfig (passed to createActor) ──\n\n");
    out.push_str(
        "/**\n * Actor client config\n * Extracted from system config in actr.toml\n */\n",
    );
    out.push_str("export const actrConfig: ActorClientConfig = {\n");
    out.push_str("  signalingUrl: system.signaling.url,\n");
    out.push_str("  realm: String(system.deployment.realm_id),\n");
    out.push_str("  iceServers: [\n");
    if !req.stun_urls.is_empty() {
        out.push_str("    ...system.webrtc.stun_urls.map((url) => ({ urls: url })),\n");
    }
    if !req.turn_urls.is_empty() {
        out.push_str("    ...system.webrtc.turn_urls.map((url) => ({ urls: url })),\n");
    }
    out.push_str("  ],\n");
    let ice_transport = if req.force_relay { "relay" } else { "all" };
    out.push_str(&format!("  iceTransportPolicy: '{ice_transport}',\n"));
    out.push_str("  serviceWorkerPath: '/actor.sw.js',\n");
    out.push_str("  autoReconnect: true,\n");
    out.push_str("  debug: false,\n");
    out.push_str("  runtimeConfig,\n");
    out.push_str("};\n");

    Ok(out)
}

// ═══════════════════════════════════════════════════════════════════
// ActorRef generation
// ═══════════════════════════════════════════════════════════════════

fn gen_actor_ref(service: &ServiceInfo, req: &WebCodegenRequest) -> Result<String, String> {
    let service_name = &service.name;

    let mut out = String::new();
    out.push_str("/**\n");
    out.push_str(" * Auto-generated ActorRef\n");
    out.push_str(&format!(" * Local service: {service_name}\n"));
    out.push_str(" *\n * DO NOT EDIT this file manually\n */\n\n");

    // Collect imports from remote proto types
    let mut remote_imports: HashMap<String, Vec<String>> = HashMap::new();
    for method in &service.methods {
        for remote in &req.remote_services {
            for rm in &remote.methods {
                if rm.input_type == method.input_type || rm.output_type == method.output_type {
                    let import_path = format!(
                        "./{}",
                        to_kebab_case(
                            &remote
                                .relative_path
                                .parent()
                                .unwrap_or(Path::new(""))
                                .to_string_lossy()
                                .replace(std::path::MAIN_SEPARATOR, "/")
                        )
                    );
                    let types = remote_imports.entry(import_path).or_default();
                    if !types.contains(&method.input_type) {
                        types.push(method.input_type.clone());
                    }
                    if !types.contains(&method.output_type) {
                        types.push(method.output_type.clone());
                    }
                }
            }
        }
    }

    for (path, types) in &remote_imports {
        let unique_types: Vec<&str> = types.iter().map(|t| t.as_str()).collect();
        out.push_str(&format!(
            "import {{ {} }} from '{}';\n",
            unique_types.join(", "),
            path
        ));
    }
    if !remote_imports.is_empty() {
        out.push('\n');
    }

    out.push_str("/**\n * callRaw compatible interface\n */\n");
    out.push_str("interface CallRawCapable {\n");
    out.push_str("  callRaw(routeKey: string, payload: Uint8Array, timeout?: number): Promise<Uint8Array>;\n");
    out.push_str("}\n\n");

    // ActrType
    let actr_type = service.actr_type.as_deref().unwrap_or("");
    if !actr_type.is_empty() {
        let parts: Vec<&str> = actr_type.splitn(2, ':').collect();
        let (mfr, name) = if parts.len() == 2 {
            (parts[0], parts[1])
        } else {
            ("", actr_type)
        };
        out.push_str("/**\n * ActrType definition\n */\n");
        out.push_str(&format!("export const {service_name}ActrType = {{\n"));
        out.push_str(&format!("  manufacturer: '{mfr}',\n"));
        out.push_str(&format!("  name: '{name}',\n"));
        out.push_str("};\n\n");
    }

    // Class
    out.push_str(&format!(
        "/**\n * {service_name} ActorRef wrapper\n * Provides type-safe RPC call methods\n */\n"
    ));
    out.push_str(&format!("export class {service_name}ActorRef {{\n"));
    out.push_str("  private actor: CallRawCapable;\n\n");
    out.push_str("  constructor(actor: CallRawCapable) {\n");
    out.push_str("    this.actor = actor;\n");
    out.push_str("  }\n");

    for method in &service.methods {
        let camel = to_camel_case(&method.name);
        let input = &method.input_type;
        let output = &method.output_type;
        let route = &method.route_key;

        out.push_str(&format!(
            "\n  /**\n   * Call {} RPC method\n   */\n",
            method.name
        ));
        out.push_str(&format!(
            "  async {camel}(request: {input}): Promise<{output}> {{\n"
        ));
        out.push_str(&format!(
            "    const encoded = {input}.encode(request).finish();\n"
        ));
        out.push_str(&format!(
            "    const responseData = await this.actor.callRaw('{route}', encoded);\n"
        ));
        out.push_str(&format!("    return {output}.decode(responseData);\n"));
        out.push_str("  }\n");
    }

    out.push_str("}\n");
    Ok(out)
}

// ═══════════════════════════════════════════════════════════════════
// index.ts
// ═══════════════════════════════════════════════════════════════════

fn gen_index(req: &WebCodegenRequest) -> Result<String, String> {
    let mut out = String::new();
    out.push_str("/**\n * Auto-generated Actr code entry point\n *\n * DO NOT EDIT this file manually\n */\n\n");
    out.push_str("export {\n");
    out.push_str("    actrConfig,\n");
    out.push_str("    runtimeConfig,\n");
    out.push_str("    actrType,\n");
    out.push_str("    edition,\n");
    out.push_str("    exports,\n");
    out.push_str("    packageInfo,\n");
    out.push_str("    dependencies,\n");
    out.push_str("    system,\n");
    out.push_str("    acl,\n");
    out.push_str("} from './actr-config';\n");

    for svc in &req.local_services {
        let file_name = to_kebab_case(&svc.name);
        out.push_str(&format!("export * from './{file_name}.actorref';\n"));
    }

    Ok(out)
}

// ═══════════════════════════════════════════════════════════════════
// Service Worker
// ═══════════════════════════════════════════════════════════════════

fn gen_service_worker(req: &WebCodegenRequest) -> Result<String, String> {
    let wasm_name = req.wasm_module_name();

    let mut out = String::new();

    // Header — the SW boots a guest-bridge runtime that serves both the
    // initiator and acceptor roles; the concrete workload is attached by
    // the guest WASM itself, so no role-specific register_fn is called here.
    out.push_str("/* Actor-RTC Service Worker entry.\n");
    out.push_str(" *\n * WASM includes: guest-bridge SW runtime\n");
    out.push_str(" *\n * This file is auto-generated by actr gen — DO NOT EDIT\n */\n\n");
    out.push_str("/* global wasm_bindgen */\n\n");

    // Console interception
    out.push_str(CONSOLE_INTERCEPTION);
    out.push('\n');

    // RUNTIME_CONFIG — received from main thread via DOM_PORT_INIT
    out.push_str("/** @type {import('@actr/web').SwRuntimeConfig | null} */\n");
    out.push_str("let RUNTIME_CONFIG = null;\n\n");

    // State variables
    out.push_str("let wasmReady = false;\n");
    out.push_str("let wsProbeDone = false;\n");
    out.push_str("const clientPorts = new Map();\n");
    out.push_str("const browserToSwClient = new Map();\n\n");

    out.push_str(CLEANUP_STALE_CLIENTS);
    out.push('\n');
    out.push_str(EMIT_SW_LOG);
    out.push('\n');

    // ensureWasmReady
    out.push_str("async function ensureWasmReady() {\n");
    out.push_str("  if (wasmReady) return;\n\n");
    out.push_str("  let runtimeUrl;\n  let wasmUrl;\n  try {\n");
    out.push_str(&format!(
        "    runtimeUrl = new URL('{wasm_name}.js', self.location).toString();\n"
    ));
    out.push_str(&format!(
        "    wasmUrl = new URL('{wasm_name}_bg.wasm', self.location).toString();\n"
    ));
    out.push_str("    emitSwLog('info', 'runtime_url', runtimeUrl);\n\n");

    // WS probe
    out.push_str("    if (!wsProbeDone && RUNTIME_CONFIG) {\n");
    out.push_str("      wsProbeDone = true;\n");
    out.push_str("      try {\n");
    out.push_str("        const probe = new WebSocket(RUNTIME_CONFIG.signaling_url);\n");
    out.push_str("        probe.binaryType = 'arraybuffer';\n");
    out.push_str("        probe.onopen = () => { emitSwLog('info', 'ws_probe_open', null); probe.close(); };\n");
    out.push_str(
        "        probe.onerror = () => { emitSwLog('error', 'ws_probe_error', null); };\n",
    );
    out.push_str(
        "      } catch (error) { emitSwLog('error', 'ws_probe_throw', String(error)); }\n",
    );
    out.push_str("    }\n\n");

    // Fetch and load WASM
    out.push_str("    const runtimeRes = await fetch(runtimeUrl, { cache: 'no-store' });\n");
    out.push_str("    const wasmRes = await fetch(wasmUrl, { cache: 'no-store' });\n\n");
    out.push_str("    try {\n");
    out.push_str("      const runtimeText = await runtimeRes.text();\n");
    out.push_str("      const patchedText = runtimeText.replace('let wasm_bindgen =', 'self.wasm_bindgen =');\n");
    out.push_str("      (0, eval)(patchedText);\n");
    out.push_str("    } catch (error) {\n");
    out.push_str("      emitSwLog('error', 'eval_failed', String(error));\n");
    out.push_str("      throw error;\n");
    out.push_str("    }\n\n");
    out.push_str("    await wasm_bindgen({ module_or_path: wasmUrl });\n");
    out.push_str("    wasm_bindgen.init_global();\n\n");

    out.push_str("    wasmReady = true;\n");
    out.push_str("    emitSwLog('info', 'wasm_ready', null);\n");
    out.push_str("  } catch (error) {\n");
    out.push_str("    console.error('[SW] WASM init failed:', error);\n");
    out.push_str("    emitSwLog('error', 'wasm_init_failed', { error: String(error) });\n");
    out.push_str("    throw error;\n");
    out.push_str("  }\n}\n\n");

    // Event listeners
    out.push_str(SW_EVENT_LISTENERS);

    Ok(out)
}

// ═══════════════════════════════════════════════════════════════════
// WASM scaffold
// ═══════════════════════════════════════════════════════════════════

fn gen_wasm_scaffold(req: &WebCodegenRequest) -> Result<Vec<PathBuf>, String> {
    let wasm_dir = req.project_root.join("wasm");
    let wasm_src = wasm_dir.join("src");
    let wasm_generated = wasm_src.join("generated");

    let mut files = Vec::new();
    // Codegen topology: provider-only projects emit service handlers;
    // importer projects emit forwarding stubs. Purely a file-scaffold
    // concern — the runtime connection role is negotiated per-peer.
    let provider_only = req.is_service_provider_only();
    let crate_name = req.wasm_module_name();
    let pkg_name = format!("{}-wasm", req.package_name);

    // 1. Cargo.toml
    let cargo_path = wasm_dir.join("Cargo.toml");
    if !cargo_path.exists() {
        write_file(&cargo_path, &gen_wasm_cargo_toml(&pkg_name))?;
        files.push(cargo_path);
    }

    // 2. build.sh
    let build_sh = wasm_dir.join("build.sh");
    if !build_sh.exists() {
        write_file(&build_sh, &gen_wasm_build_sh(&crate_name))?;
        make_executable(&build_sh)?;
        files.push(build_sh);
    }

    // 3. Generated proto types
    std::fs::create_dir_all(&wasm_generated)
        .map_err(|e| format!("Failed to create wasm generated dir: {e}"))?;

    let mut generated_modules = Vec::new();
    for file_info in &req.files {
        if !file_info.package.is_empty() {
            let mod_name = to_snake_case(&file_info.package);
            if !generated_modules.contains(&mod_name) {
                generated_modules.push(mod_name.clone());
                let rs_path = wasm_generated.join(format!("{mod_name}.rs"));
                let rs_content = gen_proto_rs_types(file_info);
                write_file(&rs_path, &rs_content)?;
                files.push(rs_path);
            }
        }
    }

    // generated/mod.rs
    let mod_rs = wasm_generated.join("mod.rs");
    let mut mod_content = String::from("//! Auto-generated proto type modules\n\n");
    for m in &generated_modules {
        mod_content.push_str(&format!("pub mod {m};\n"));
    }
    write_file(&mod_rs, &mod_content)?;
    files.push(mod_rs);

    // 4. Handler files + lib.rs
    if provider_only {
        for svc in &req.local_services {
            let handler_name = to_snake_case(&svc.name);
            let handler_path = wasm_src.join(format!("{handler_name}.rs"));
            if !handler_path.exists() {
                write_file(&handler_path, &gen_server_handler(svc))?;
                files.push(handler_path);
            }
        }
        let lib_path = wasm_src.join("lib.rs");
        if !lib_path.exists() {
            write_file(&lib_path, &gen_server_lib_rs(req))?;
            files.push(lib_path);
        }
    } else {
        for svc in &req.local_services {
            let handler_name = to_snake_case(&svc.name);
            let handler_path = wasm_src.join(format!("{handler_name}_handler.rs"));
            if !handler_path.exists() {
                write_file(&handler_path, &gen_client_handler(svc, req))?;
                files.push(handler_path);
            }
        }
        let lib_path = wasm_src.join("lib.rs");
        if !lib_path.exists() {
            write_file(&lib_path, &gen_client_lib_rs(req))?;
            files.push(lib_path);
        }
    }

    Ok(files)
}

// ═══════════════════════════════════════════════════════════════════
// WASM templates
// ═══════════════════════════════════════════════════════════════════

fn gen_wasm_cargo_toml(pkg_name: &str) -> String {
    format!(
        r#"[package]
name = "{pkg_name}"
version = "0.1.0"
edition = "2024"
rust-version = "1.88"

[workspace]

[lib]
crate-type = ["cdylib", "rlib"]

[dependencies]
actr-sw-host = {{ git = "https://github.com/actor-rtc/actr", branch = "web" }}
actr-web-common = {{ git = "https://github.com/actor-rtc/actr", branch = "web" }}

wasm-bindgen = "0.2"
wasm-bindgen-futures = "0.4"
js-sys = "0.3"
serde-wasm-bindgen = "0.6"
web-sys = {{ version = "0.3", features = ["console"] }}
futures = "0.3"
async-trait = "0.1"
serde = {{ version = "1.0", features = ["derive"] }}
serde_json = "1.0"
prost = "0.14"
bytes = "1.0"
log = "0.4"
wasm-logger = "0.2"
console_error_panic_hook = "0.1"
"#
    )
}

fn gen_wasm_build_sh(crate_name: &str) -> String {
    format!(
        r#"#!/bin/bash
set -e

echo "🔨 Building WASM..."

TMPDIR="${{TMPDIR:-$(pwd)/.tmp}}"
export TMPDIR
mkdir -p "$TMPDIR"

OUT_DIR="../public"

rm -f "$OUT_DIR"/{crate_name}*.wasm "$OUT_DIR"/{crate_name}*.js "$OUT_DIR"/{crate_name}*.d.ts

wasm-pack build \
  --target no-modules \
  --out-dir "$OUT_DIR" \
  --out-name {crate_name} \
  --release

rm -f "$OUT_DIR/package.json" "$OUT_DIR/.gitignore"

echo ""
echo "✅ WASM built successfully!"
echo "📁 Output: $OUT_DIR"
echo ""
ls -la "$OUT_DIR"/{crate_name}*
"#
    )
}

fn gen_proto_rs_types(file_info: &FileInfo) -> String {
    let mut out = String::from(
        "//! Auto-generated protobuf types\n\nuse prost::Message;\nuse serde::{Deserialize, Serialize};\n\n",
    );

    // Compile the proto through protoc and walk the resulting descriptor for
    // structured field information. Failure here degrades to an empty type
    // body (matching the previous regex parser, which silently emitted no
    // fields when the file could not be read) so the rest of the scaffold
    // still writes.
    let set = match crate::descriptor::compile_to_descriptor_set(
        std::slice::from_ref(&file_info.proto_file),
        &[],
    ) {
        Ok(set) => set,
        Err(err) => {
            tracing::warn!(
                "{}: protoc descriptor compile failed ({}); emitting empty message bodies",
                file_info.proto_file.display(),
                err
            );
            prost_types::FileDescriptorSet::default()
        }
    };
    let file_desc = crate::descriptor::find_file(&set, &file_info.proto_file);

    // Fast lookup of service names so we can skip them in the message loop.
    let service_names: std::collections::HashSet<&str> = file_desc
        .map(|f| f.service.iter().map(|s| s.name()).collect())
        .unwrap_or_default();

    for type_name in &file_info.declared_type_names {
        if service_names.contains(type_name.as_str()) {
            continue;
        }

        let fields = file_desc
            .and_then(|f| crate::descriptor::message_fields_for_scaffold(f, type_name))
            .unwrap_or_default();

        out.push_str("#[derive(Clone, PartialEq, Message, Serialize, Deserialize)]\n");
        out.push_str(&format!("pub struct {type_name} {{\n"));
        for (i, (field_name, field_type)) in fields.iter().enumerate() {
            let tag = i + 1;
            let rust_type = proto_type_to_rust(field_type);
            let prost_attr = proto_type_to_prost_attr(field_type, tag);
            out.push_str(&format!("    {prost_attr}\n"));
            out.push_str(&format!("    pub {field_name}: {rust_type},\n"));
        }
        out.push_str("}\n\n");
    }

    out
}

fn gen_server_handler(service: &ServiceInfo) -> String {
    let sn = &service.name;
    let mut out = String::new();
    out.push_str(&format!("//! {sn} implementation\n\n"));
    out.push_str("use std::rc::Rc;\nuse actr_sw_host::RuntimeContext;\nuse prost::Message;\n\n");

    let pkg = to_snake_case(&service.package);
    for m in &service.methods {
        out.push_str(&format!(
            "use crate::generated::{pkg}::{{{}, {}}};\n",
            m.input_type, m.output_type
        ));
    }
    out.push('\n');

    out.push_str(&format!("pub struct {sn};\n\n"));
    out.push_str(&format!("impl {sn} {{\n"));
    out.push_str("    pub fn new() -> Self { Self }\n\n");

    for m in &service.methods {
        out.push_str(&format!(
            "    pub async fn {}(&self, request: {}, _ctx: Rc<RuntimeContext>) -> Result<{}, String> {{\n",
            m.snake_name, m.input_type, m.output_type
        ));
        out.push_str(&format!(
            "        log::info!(\"Received {sn} {{}} request\", \"{}\");\n",
            m.name
        ));
        out.push_str("        // TODO: Implement business logic\n");
        out.push_str(&format!("        Ok({}::default())\n", m.output_type));
        out.push_str("    }\n\n");
    }
    out.push_str("}\n\n");

    out.push_str(&format!(
        "static SERVICE: std::sync::OnceLock<{sn}> = std::sync::OnceLock::new();\n\n"
    ));
    out.push_str(&format!("fn get_service() -> &'static {sn} {{\n"));
    out.push_str(&format!("    SERVICE.get_or_init({sn}::new)\n}}\n\n"));

    out.push_str("pub async fn handle_request(method: &str, request_bytes: &[u8], ctx: Rc<RuntimeContext>) -> Result<Vec<u8>, String> {\n");
    out.push_str("    match method {\n");
    for m in &service.methods {
        out.push_str(&format!(
            "        \"{}\" | \"{}\" => {{\n",
            m.name, m.snake_name
        ));
        out.push_str(&format!(
            "            let request = {}::decode(request_bytes).map_err(|e| format!(\"Decode failed: {{}}\", e))?;\n",
            m.input_type
        ));
        out.push_str(&format!(
            "            let response = get_service().{}(request, ctx).await?;\n",
            m.snake_name
        ));
        out.push_str("            let mut buf = Vec::with_capacity(response.encoded_len());\n");
        out.push_str("            response.encode(&mut buf).map_err(|e| format!(\"Encode failed: {}\", e))?;\n");
        out.push_str("            Ok(buf)\n");
        out.push_str("        }\n");
    }
    out.push_str("        _ => Err(format!(\"Unknown method: {}\", method)),\n");
    out.push_str("    }\n}\n");

    out
}

fn gen_client_handler(service: &ServiceInfo, req: &WebCodegenRequest) -> String {
    let sn = &service.name;
    let mut out = String::new();
    out.push_str(&format!(
        "//! {sn} local handler — forwards requests to remote service\n\n"
    ));
    out.push_str("use std::rc::Rc;\nuse std::sync::OnceLock;\n");
    out.push_str("use actr_sw_host::RuntimeContext;\nuse actr_sw_host::WebContext;\n\n");

    let remote_target = req.dependencies.first().and_then(|d| d.actr_type.as_ref());

    if let Some(target) = remote_target {
        out.push_str("static TARGET_TYPE: OnceLock<actr_sw_host::actr_protocol::ActrType> = OnceLock::new();\n\n");
        out.push_str("fn target_type() -> &'static actr_sw_host::actr_protocol::ActrType {\n");
        out.push_str("    TARGET_TYPE.get_or_init(|| actr_sw_host::actr_protocol::ActrType {\n");
        out.push_str(&format!(
            "        manufacturer: \"{}\".to_string(),\n",
            target.manufacturer
        ));
        out.push_str(&format!("        name: \"{}\".to_string(),\n", target.name));
        out.push_str("        version: \"1.0.0\".to_string(),\n    })\n}\n\n");
    }

    let remote_route_key = req
        .remote_services
        .first()
        .and_then(|s| s.methods.first())
        .map(|m| m.route_key.as_str())
        .unwrap_or("unknown.Unknown.Unknown");

    out.push_str("pub async fn handle_request(method: &str, request_bytes: &[u8], ctx: Rc<RuntimeContext>) -> Result<Vec<u8>, String> {\n");
    out.push_str("    match method {\n");
    for m in &service.methods {
        out.push_str(&format!("        \"{}\" => {{\n", m.name));
        out.push_str(&format!(
            "            log::info!(\"[{}] Forwarding to remote...\");\n",
            sn
        ));
        if remote_target.is_some() {
            out.push_str("            let target = ctx.discover(target_type()).await.map_err(|e| format!(\"Discover failed: {}\", e))?;\n");
            out.push_str(&format!(
                "            let response = ctx.call_raw(&target, \"{remote_route_key}\", request_bytes, 30000).await.map_err(|e| format!(\"call_raw failed: {{}}\", e))?;\n"
            ));
            out.push_str("            Ok(response)\n");
        } else {
            out.push_str("            Err(\"No remote target configured\".to_string())\n");
        }
        out.push_str("        }\n");
    }
    out.push_str("        _ => Err(format!(\"Unknown method: {}\", method)),\n");
    out.push_str("    }\n}\n");

    out
}

fn gen_server_lib_rs(req: &WebCodegenRequest) -> String {
    let mut handler_mods = Vec::new();
    let mut register_calls = Vec::new();

    for svc in &req.local_services {
        let hn = to_snake_case(&svc.name);
        handler_mods.push(hn.clone());
        let register_fn = format!("register_{hn}");
        let service_match = if svc.package.is_empty() {
            svc.name.clone()
        } else {
            format!("{}.{}", svc.package, svc.name)
        };
        register_calls.push((register_fn, hn, service_match));
    }

    let mut out = String::from(
        "//! WASM entry — Service Worker Runtime + Service Handler\n\nmod generated;\n",
    );
    for m in &handler_mods {
        out.push_str(&format!("mod {m};\n"));
    }
    out.push_str("\nuse std::rc::Rc;\nuse wasm_bindgen::prelude::*;\npub use actr_sw_host::*;\n\n");
    out.push_str("#[wasm_bindgen(start)]\npub fn init() {\n    console_error_panic_hook::set_once();\n    wasm_logger::init(wasm_logger::Config::default());\n    log::info!(\"WASM initialized\");\n}\n\n");

    for (rf, hn, sm) in &register_calls {
        out.push_str("#[wasm_bindgen]\n");
        out.push_str(&format!("pub fn {rf}() {{\n"));
        out.push_str(&format!("    log::info!(\"Registering {hn}...\");\n\n"));
        out.push_str(
            "    actr_sw_host::register_service_handler(Rc::new(|route_key, bytes, ctx| {\n",
        );
        out.push_str(
            "        let route_key = route_key.to_string();\n        let bytes = bytes.to_vec();\n",
        );
        out.push_str("        Box::pin(async move {\n");
        out.push_str(
            "            let (service, method) = if let Some(last_dot) = route_key.rfind('.') {\n",
        );
        out.push_str("                (&route_key[..last_dot], &route_key[last_dot + 1..])\n");
        out.push_str(
            "            } else {\n                (route_key.as_str(), \"\")\n            };\n",
        );
        out.push_str("            match service {\n");
        out.push_str(&format!(
            "                \"{sm}\" => {hn}::handle_request(method, &bytes, ctx).await,\n"
        ));
        out.push_str("                _ => Err(format!(\"Unknown service: {}\", service)),\n");
        out.push_str("            }\n        })\n    }));\n\n");
        out.push_str(&format!("    log::info!(\"{hn} registered\");\n}}\n\n"));
    }

    out
}

fn gen_client_lib_rs(req: &WebCodegenRequest) -> String {
    let mut handler_mods = Vec::new();
    let mut register_calls = Vec::new();

    for svc in &req.local_services {
        let hn = to_snake_case(&svc.name);
        let mn = format!("{hn}_handler");
        handler_mods.push(mn.clone());
        let rf = format!("register_{hn}_handler");
        let sm = if svc.package.is_empty() {
            svc.name.clone()
        } else {
            format!("{}.{}", svc.package, svc.name)
        };
        register_calls.push((rf, mn, sm));
    }

    let mut out =
        String::from("//! WASM entry — Service Worker Runtime + Local Handler\n\nmod generated;\n");
    for m in &handler_mods {
        out.push_str(&format!("mod {m};\n"));
    }
    out.push_str("\nuse std::rc::Rc;\nuse wasm_bindgen::prelude::*;\npub use actr_sw_host::*;\n\n");
    out.push_str("#[wasm_bindgen(start)]\npub fn init() {\n    console_error_panic_hook::set_once();\n    wasm_logger::init(wasm_logger::Config::default());\n    log::info!(\"WASM initialized\");\n}\n\n");

    for (rf, mn, sm) in &register_calls {
        out.push_str("#[wasm_bindgen]\n");
        out.push_str(&format!("pub fn {rf}() {{\n"));
        out.push_str("    log::info!(\"Registering handler...\");\n\n");
        out.push_str(
            "    actr_sw_host::register_service_handler(Rc::new(|route_key, bytes, ctx| {\n",
        );
        out.push_str(
            "        let route_key = route_key.to_string();\n        let bytes = bytes.to_vec();\n",
        );
        out.push_str("        Box::pin(async move {\n");
        out.push_str(
            "            let (service, method) = if let Some(last_dot) = route_key.rfind('.') {\n",
        );
        out.push_str("                (&route_key[..last_dot], &route_key[last_dot + 1..])\n");
        out.push_str(
            "            } else {\n                (route_key.as_str(), \"\")\n            };\n",
        );
        out.push_str("            match service {\n");
        out.push_str(&format!(
            "                \"{sm}\" => {mn}::handle_request(method, &bytes, ctx).await,\n"
        ));
        out.push_str("                _ => Err(format!(\"Unknown service: {}\", service)),\n");
        out.push_str("            }\n        })\n    }));\n\n");
        out.push_str("    log::info!(\"Handler registered\");\n}\n\n");
    }

    out
}

fn gen_root_build_sh() -> String {
    r#"#!/bin/bash
set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
WASM_DIR="$SCRIPT_DIR/wasm"

echo "Building WASM..."
(
  cd "$WASM_DIR"
  ./build.sh
)

echo "WASM artifacts ready in public/"
"#
    .to_string()
}

// ═══════════════════════════════════════════════════════════════════
// Helpers
// ═══════════════════════════════════════════════════════════════════

fn write_file(path: &Path, content: &str) -> Result<(), String> {
    if let Some(parent) = path.parent() {
        std::fs::create_dir_all(parent)
            .map_err(|e| format!("Failed to create directory {}: {e}", parent.display()))?;
    }
    std::fs::write(path, content)
        .map_err(|e| format!("Failed to write {}: {e}", path.display()))?;
    info!("  📄 {}", path.display());
    Ok(())
}

fn make_executable(path: &Path) -> Result<(), String> {
    #[cfg(unix)]
    {
        use std::os::unix::fs::PermissionsExt;
        let mut perms = std::fs::metadata(path)
            .map_err(|e| format!("Failed to read metadata: {e}"))?
            .permissions();
        perms.set_mode(perms.mode() | 0o755);
        std::fs::set_permissions(path, perms)
            .map_err(|e| format!("Failed to set permissions: {e}"))?;
    }
    #[cfg(not(unix))]
    let _ = path;
    Ok(())
}

fn to_kebab_case(name: &str) -> String {
    name.to_kebab_case()
}

fn to_snake_case(name: &str) -> String {
    name.to_snake_case()
}

fn to_camel_case(name: &str) -> String {
    name.to_lower_camel_case()
}

fn proto_type_to_rust(proto_type: &str) -> String {
    match proto_type {
        "string" => "String".to_string(),
        "bytes" => "Vec<u8>".to_string(),
        "bool" => "bool".to_string(),
        "int32" | "sint32" | "sfixed32" => "i32".to_string(),
        "int64" | "sint64" | "sfixed64" => "i64".to_string(),
        "uint32" | "fixed32" => "u32".to_string(),
        "uint64" | "fixed64" => "u64".to_string(),
        "float" => "f32".to_string(),
        "double" => "f64".to_string(),
        other => other.to_string(),
    }
}

fn proto_type_to_prost_attr(proto_type: &str, tag: usize) -> String {
    match proto_type {
        "string" => format!("#[prost(string, tag = \"{tag}\")]"),
        "bytes" => format!("#[prost(bytes, tag = \"{tag}\")]"),
        "bool" => format!("#[prost(bool, tag = \"{tag}\")]"),
        "int32" | "sint32" | "sfixed32" => format!("#[prost(int32, tag = \"{tag}\")]"),
        "int64" | "sint64" | "sfixed64" => format!("#[prost(int64, tag = \"{tag}\")]"),
        "uint32" | "fixed32" => format!("#[prost(uint32, tag = \"{tag}\")]"),
        "uint64" | "fixed64" => format!("#[prost(uint64, tag = \"{tag}\")]"),
        "float" => format!("#[prost(float, tag = \"{tag}\")]"),
        "double" => format!("#[prost(double, tag = \"{tag}\")]"),
        _ => format!("#[prost(message, tag = \"{tag}\")]"),
    }
}

/// Format a TOML value as a TypeScript object literal
fn format_toml_as_ts(value: &toml::Value, indent: usize) -> String {
    let pad = "  ".repeat(indent);
    let inner_pad = "  ".repeat(indent + 1);
    match value {
        toml::Value::Table(table) => {
            if table.is_empty() {
                return "{}".to_string();
            }
            let mut out = "{\n".to_string();
            for (key, val) in table {
                let ts_key = if key.contains('-') || key.contains('.') {
                    format!("'{key}'")
                } else {
                    key.clone()
                };
                out.push_str(&format!(
                    "{inner_pad}{ts_key}: {},\n",
                    format_toml_as_ts(val, indent + 1)
                ));
            }
            out.push_str(&format!("{pad}}}"));
            out
        }
        toml::Value::Array(arr) => {
            if arr.is_empty() {
                return "[]".to_string();
            }
            let items: Vec<String> = arr
                .iter()
                .map(|v| format_toml_as_ts(v, indent + 1))
                .collect();
            if arr.iter().all(|v| !v.is_table()) {
                format!("[{}]", items.join(", "))
            } else {
                let mut out = "[\n".to_string();
                for item in &items {
                    out.push_str(&format!("{inner_pad}{item},\n"));
                }
                out.push_str(&format!("{pad}]"));
                out
            }
        }
        toml::Value::String(s) => format!("'{}'", s.replace('\'', "\\'")),
        toml::Value::Integer(n) => n.to_string(),
        toml::Value::Float(f) => f.to_string(),
        toml::Value::Boolean(b) => b.to_string(),
        toml::Value::Datetime(dt) => format!("'{dt}'"),
    }
}

// ═══════════════════════════════════════════════════════════════════
// Inlined JS constants
// ═══════════════════════════════════════════════════════════════════

const CONSOLE_INTERCEPTION: &str = r#"(function () {
  const _origInfo = console.info;
  const _origWarn = console.warn;
  const _origError = console.error;
  const _origLog = console.log;

  function extractMessage(args) {
    return Array.from(args)
      .filter(a => typeof a === 'string' && !/^\s*(color|background|font-weight|padding)\s*:/.test(a))
      .join(' ')
      .replace(/%c/g, '')
      .trim();
  }

  function broadcast(data) {
    self.clients.matchAll({ type: 'window' }).then(clients => {
      for (const client of clients) {
        client.postMessage(data);
      }
    }).catch(() => {});
  }

  console.info = function (...args) {
    _origInfo.apply(console, args);
    const msg = extractMessage(args);
    if (msg.includes('[SW]') || msg.includes('Echo') || msg.includes('Registering')
      || msg.includes('Scheduler') || msg.includes('Dispatcher')) {
      broadcast({ type: 'sw_log', level: 'info', message: msg, ts: Date.now() });
    }
  };

  console.warn = function (...args) {
    _origWarn.apply(console, args);
    const msg = extractMessage(args);
    broadcast({ type: 'sw_log', level: 'warn', message: msg, ts: Date.now() });
  };

  console.error = function (...args) {
    _origError.apply(console, args);
    const msg = extractMessage(args);
    broadcast({ type: 'sw_log', level: 'error', message: msg, ts: Date.now() });
  };

  console.log = function (...args) {
    _origLog.apply(console, args);
    const msg = extractMessage(args);
    if (msg.includes('[SW]') || msg.includes('[WebRTC]')) {
      broadcast({ type: 'sw_log', level: 'info', message: msg, ts: Date.now() });
    }
  };
})();
"#;

const CLEANUP_STALE_CLIENTS: &str = r#"async function cleanupStaleClients() {
  if (!wasmReady) return;
  try {
    const activeWindows = await self.clients.matchAll({ type: 'window' });
    const activeIds = new Set(activeWindows.map(c => c.id));
    for (const [browserId, swClientId] of browserToSwClient.entries()) {
      if (!activeIds.has(browserId)) {
        browserToSwClient.delete(browserId);
        clientPorts.delete(swClientId);
        try { await wasm_bindgen.unregister_client(swClientId); } catch (_) {}
      }
    }
  } catch (_) {}
}
"#;

const EMIT_SW_LOG: &str = r#"function emitSwLog(level, message, detail) {
  for (const port of clientPorts.values()) {
    try {
      port.postMessage({
        type: 'webrtc_event',
        payload: { eventType: 'sw_log', data: { level, message, detail } },
      });
    } catch (_) {}
  }
}
"#;

const SW_EVENT_LISTENERS: &str = r#"self.addEventListener('install', (event) => {
  event.waitUntil(self.skipWaiting());
});

self.addEventListener('activate', (event) => {
  event.waitUntil(self.clients.claim());
});

self.addEventListener('message', (event) => {
  if (event.data && event.data.type === 'PING') {
    if (event.source && event.source.postMessage) {
      event.source.postMessage({ type: 'PONG' });
    }
    return;
  }
  if (!event.data || event.data.type !== 'DOM_PORT_INIT') return;

  const port = event.data.port;
  const clientId = event.data.clientId;
  if (!port || !clientId) return;

  // Receive runtime config from main thread (sourced from actr-config.ts)
  if (event.data.runtimeConfig && !RUNTIME_CONFIG) {
    RUNTIME_CONFIG = event.data.runtimeConfig;
  }

  clientPorts.set(clientId, port);
  const browserId = event.source && event.source.id;
  if (browserId) browserToSwClient.set(browserId, clientId);

  cleanupStaleClients();

  if (event.source && event.source.postMessage) {
    event.source.postMessage({ type: 'sw_ack', message: 'port_ready' });
  }

  emitSwLog('info', 'sw_env', {
    clientId,
    location: self.location ? self.location.href : null,
    totalClients: clientPorts.size,
  });

  port.onmessage = async (portEvent) => {
    try { await ensureWasmReady(); } catch (_) { return; }
    const message = portEvent.data;
    if (!message || !message.type) return;

    switch (message.type) {
      case 'control':
        try { await wasm_bindgen.handle_dom_control(clientId, message.payload); } catch (e) {
          console.error('[SW] handle_dom_control failed:', e);
        }
        break;
      case 'webrtc_event':
        try { await wasm_bindgen.handle_dom_webrtc_event(clientId, message.payload); } catch (e) {
          console.error('[SW] handle_dom_webrtc_event failed:', e);
        }
        break;
      case 'fast_path_data':
        try { await wasm_bindgen.handle_dom_fast_path(clientId, message.payload); } catch (e) {
          console.error('[SW] handle_dom_fast_path failed:', e);
        }
        break;
      case 'register_datachannel_port':
        try {
          const dcPort = message.payload.port;
          const dcPeerId = message.payload.peerId;
          if (dcPort && dcPeerId) {
            await wasm_bindgen.register_datachannel_port(clientId, dcPeerId, dcPort);
          }
        } catch (e) {
          console.error('[SW] register_datachannel_port failed:', e);
        }
        break;
    }
  };

  port.start();

  ensureWasmReady().then(async () => {
    try {
      if (!RUNTIME_CONFIG) {
        console.error('[SW] RUNTIME_CONFIG not received from main thread');
        return;
      }
      await wasm_bindgen.register_client(clientId, RUNTIME_CONFIG, port);
      emitSwLog('info', 'client_registered', { clientId });
    } catch (error) {
      console.error('[SW] register_client failed:', error);
    }
  });
});
"#;