// components/proxy.ts  (T07)
//
// foundation-caddy — the ONLY public ingress (CONTRACT_003 §3.2): 80/443 published,
// automatic TLS via Let's Encrypt DNS-01 over Cloudflare (PLAN-002 §9.4). Standard
// caddy:2 lacks the DNS plugin, so the egg runs a custom xcaddy build
// (containers/caddy-cloudflare/Dockerfile) compiled on the VM (ADR-007); its image
// id is what the container runs. The Caddyfile (no secrets — the CF token is read
// from the container env) is rendered here and bind-mounted from the host.
//
// Vault is deliberately NOT proxied publicly (CONTRACT_003 "restricted"): it's
// reached internally over foundation-net / docker-exec. forge -> Forgejo (502 until
// T08), s3 -> RustFS.
import * as fs from "fs";
import * as path from "path";
import * as pulumi from "@pulumi/pulumi";
import * as docker from "@pulumi/docker";
import * as command from "@pulumi/command";
import { DeployCtx } from "../lib/context";
import { vmConnection } from "../lib/remote";

const DOCKERFILE = fs.readFileSync(
  path.resolve(
    __dirname,
    "..",
    "..",
    "containers",
    "caddy-cloudflare",
    "Dockerfile",
  ),
  "utf8",
);

// Dockerfile arrives on stdin; build logs -> stderr; the built image id -> stdout
// (so it becomes the container's image, recreated only when the Dockerfile changes).
const BUILD = `set -eu
docker build --provenance=false --sbom=false -t foundation-caddy:cf - >&2
docker image inspect foundation-caddy:cf --format '{{.Id}}'`;

const HOST_CADDYFILE = "/srv/foundation/caddy/Caddyfile";
const WRITE_CADDYFILE = `set -eu
mkdir -p /srv/foundation/caddy
cat > ${HOST_CADDYFILE}`;

export interface ProxyOutputs {
  container: docker.Container;
  imageId: pulumi.Output<string>;
}

function renderCaddyfile(ctx: DeployCtx): string {
  const { cfg } = ctx;
  const site = (host: string, upstream: string) =>
    `${host} {
	tls {
		dns cloudflare {env.CF_API_TOKEN}
		resolvers 1.1.1.1
	}
	reverse_proxy ${upstream}
}`;
  return `{
	email ${cfg.tls.acmeEmail}
}

${site(cfg.hosts.forge, "foundation-forgejo:3000")}

${site(cfg.hosts.s3, "foundation-rustfs:9000")}
`;
}

export function deployProxy(ctx: DeployCtx): ProxyOutputs {
  const { provider, network } = ctx;
  const conn = vmConnection(ctx);

  // 1) Build the custom Caddy+Cloudflare image on the VM.
  const build = new command.remote.Command("foundation-caddy-build", {
    connection: conn,
    create: BUILD,
    update: BUILD,
    stdin: DOCKERFILE,
    addPreviousOutputInEnv: false,
    triggers: [DOCKERFILE],
  });
  const imageId = build.stdout.apply((s) => s.trim());

  // 2) Render + write the Caddyfile to the host (bind-mounted into the container).
  const caddyfile = renderCaddyfile(ctx);
  const writeCaddyfile = new command.remote.Command("foundation-caddy-config", {
    connection: conn,
    create: WRITE_CADDYFILE,
    update: WRITE_CADDYFILE,
    stdin: caddyfile,
    addPreviousOutputInEnv: false,
    triggers: [caddyfile],
  });

  // 3) Volumes: ACME certs/account (data) + autosave config (CONTRACT_003 §3.4).
  const dataVol = new docker.Volume(
    "foundation-caddy-data",
    { name: "foundation-caddy-data" },
    { provider, retainOnDelete: true }, // ACME account/certs — avoid re-issue churn
  );
  const configVol = new docker.Volume(
    "foundation-caddy-config",
    { name: "foundation-caddy-config" },
    { provider },
  );

  const cfToken = new pulumi.Config("foundation").requireSecret(
    "cloudflareApiToken",
  );

  const container = new docker.Container(
    "foundation-caddy",
    {
      name: "foundation-caddy",
      image: imageId,
      hostname: "foundation-caddy",
      restart: "unless-stopped",
      envs: [pulumi.interpolate`CF_API_TOKEN=${cfToken}`],
      ports: [
        { internal: 80, external: 80 },
        { internal: 443, external: 443 },
      ],
      volumes: [
        { volumeName: dataVol.name, containerPath: "/data" },
        { volumeName: configVol.name, containerPath: "/config" },
        {
          hostPath: HOST_CADDYFILE,
          containerPath: "/etc/caddy/Caddyfile",
          readOnly: true,
        },
      ],
      networksAdvanced: [{ name: network.name, aliases: ["foundation-caddy"] }],
      logDriver: "json-file",
      logOpts: { "max-size": "10m", "max-file": "3" },
    },
    {
      provider,
      dependsOn: [network, build, writeCaddyfile],
      deleteBeforeReplace: true,
    },
  );

  return { container, imageId };
}