// Wiring for the sign-in and registration screens.
//
// This file contains no cryptography — wallet.js does all of that. What it
// does is decide which of the three ways to sign is on offer and get out of
// the way of the other two:
//
//   1. A wallet the browser already has (Theseus exposes one). Best case: the
//      key never comes near this page.
//   2. A recovery phrase typed here, used once, and wiped.
//   3. A signature produced somewhere else entirely and pasted in. This one
//      works with JavaScript switched off, which is why the markup ships with
//      the paste box present and the buttons hidden until this script decides
//      they are usable.
//
// The progressive-enhancement direction matters: buttons start hidden and are
// revealed, rather than starting visible and being disabled. A script that
// fails to load leaves a page that still works.

(() => {
  "use strict";

  const CONFIG = window.SIRIUS_PRESS || {};
  const strings = CONFIG.strings || {};

  function setStatus(block, text, kind = "") {
    const el = block.querySelector(".sirius-wallet__status");
    if (!el) return;
    el.textContent = text || "";
    el.className = "sirius-wallet__status" + (kind ? " is-" + kind : "");
  }

  /** Submit the form the block sits in, once a signature is in place. */
  function submitForm(block) {
    const form = block.closest("form");
    if (!form) return;

    // WordPress marks its username and password inputs `required`, and the
    // wallet path deliberately leaves both empty — the signature is the
    // credential. Constraint validation would otherwise refuse the submit and
    // point a "Please fill out this field" bubble at an input the visitor is
    // not supposed to touch, with the signature already sitting in the form.
    //
    // Only reached from the wallet buttons, so password sign-in keeps its
    // validation.
    form.noValidate = true;

    if (typeof form.requestSubmit === "function") {
      form.requestSubmit();
    } else {
      form.submit();
    }
  }

  function setSignature(block, signature, address) {
    const field = block.querySelector(".sirius-wallet__signature");
    if (field) field.value = signature;
    // The address the signature claims. The server compares it against the
    // one it recovers, which is the only way a signature over the wrong text
    // becomes an error instead of a different identity.
    const claim = block.querySelector(".sirius-wallet__address");
    if (claim && address) claim.value = address;
  }

  /** On the paste path the visitor supplies the address themselves. */
  function adoptTypedAddress(block) {
    const typed = block.querySelector(".sirius-wallet__address-input");
    const claim = block.querySelector(".sirius-wallet__address");
    if (typed && claim && typed.value.trim() && !claim.value) {
      claim.value = typed.value.trim();
    }
  }

  async function signWithPhrase(block) {
    const input = block.querySelector(".sirius-wallet__phrase-input");
    const message = block.querySelector(".sirius-wallet__message").value;
    const phrase = input ? input.value : "";

    const check = window.SiriusWallet.validatePhrase(phrase);
    if (!check.ok) {
      setStatus(block, check.error, "error");
      return;
    }

    setStatus(block, strings.signing || "Signing…");
    let wallet;
    try {
      wallet = await window.SiriusWallet.fromPhrase(phrase, {
        prefix: CONFIG.prefix,
        path: CONFIG.path,
      });
      setSignature(block, await wallet.sign(message), wallet.address);
    } catch (err) {
      setStatus(block, err.message || String(err), "error");
      return;
    } finally {
      // The phrase has done its one job. Clear it from the field and from the
      // wallet object before anything else on the page runs.
      if (input) input.value = "";
      if (wallet && wallet.forget) wallet.forget();
    }
    submitForm(block);
  }

  async function signWithExternal(block) {
    const external = window.SiriusWallet.external();
    if (!external) {
      setStatus(block, strings.noWallet || "No wallet found in this browser.", "error");
      return;
    }
    const message = block.querySelector(".sirius-wallet__message").value;
    setStatus(block, strings.signing || "Signing…");
    try {
      setSignature(block, await external.sign(message), await external.address());
    } catch (err) {
      // A user declining the wallet's approval dialog is a normal outcome, not
      // an error worth shouting about.
      const text = err && err.message ? err.message : String(err);
      setStatus(block, /reject/i.test(text) ? "" : text, /reject/i.test(text) ? "" : "error");
      return;
    }
    submitForm(block);
  }

  function enhance(block) {
    // Whatever happens next, a hand-typed address must reach the server.
    const form = block.closest("form");
    if (form) form.addEventListener("submit", () => adoptTypedAddress(block));

    const signButton = block.querySelector(".sirius-wallet__sign");
    const externalButton = block.querySelector(".sirius-wallet__external");
    const phraseArea = block.querySelector(".sirius-wallet__phrase");

    if (!window.SiriusWallet || !window.crypto || !window.crypto.subtle) {
      // No usable crypto — for instance an http:// origin, where WebCrypto is
      // unavailable. Say so, and leave the paste path alone: it still works.
      setStatus(
        block,
        "This browser cannot sign here (a secure https connection is required). Paste a signature from your own wallet instead.",
        "error",
      );
      const manual = block.querySelector(".sirius-wallet__manual");
      if (manual) manual.open = true;
      return;
    }

    if (phraseArea) phraseArea.hidden = false;
    if (signButton) {
      signButton.hidden = false;
      signButton.addEventListener("click", () => signWithPhrase(block));
    }
    if (externalButton && window.SiriusWallet.external()) {
      externalButton.hidden = false;
      externalButton.addEventListener("click", () => signWithExternal(block));
    }

    // Enter in the phrase box should sign, not submit an unsigned form.
    const input = block.querySelector(".sirius-wallet__phrase-input");
    if (input) {
      input.addEventListener("keydown", (event) => {
        if (event.key === "Enter" && !event.shiftKey) {
          event.preventDefault();
          signWithPhrase(block);
        }
      });
    }
  }

  /** The "which address is this phrase?" helper on the recovery page. */
  function enhanceDerive() {
    const button = document.getElementById("sirius_derive_go");
    const input = document.getElementById("sirius_derive_phrase");
    const out = document.querySelector(".sirius-derive__out");
    if (!button || !input || !out) return;

    button.addEventListener("click", async () => {
      const check = window.SiriusWallet.validatePhrase(input.value);
      if (!check.ok) {
        out.textContent = check.error;
        out.className = "sirius-derive__out is-error";
        return;
      }
      out.textContent = strings.signing || "Working…";
      out.className = "sirius-derive__out";
      try {
        const wallet = await window.SiriusWallet.fromPhrase(input.value, {
          prefix: CONFIG.prefix,
          path: CONFIG.path,
        });
        out.textContent = wallet.address;
        out.className = "sirius-derive__out is-address";
        wallet.forget();
      } catch (err) {
        out.textContent = err.message || String(err);
        out.className = "sirius-derive__out is-error";
      } finally {
        input.value = "";
      }
    });
  }

  function start() {
    document.querySelectorAll(".sirius-wallet").forEach(enhance);
    enhanceDerive();
  }

  if (document.readyState === "loading") {
    document.addEventListener("DOMContentLoaded", start);
  } else {
    start();
  }
})();