import { useRef, useState } from "react";
import { updateAccountProfile } from "../api";
import { getAccessToken, saveStoredAccount } from "../auth";

const MAX_AVATAR_BYTES = 512 * 1024;
const ALLOWED_TYPES = new Set(["image/jpeg", "image/png", "image/webp"]);

function accountInitials(account) {
  return `${account?.first_name?.[0] || ""}${account?.last_name?.[0] || ""}`.toUpperCase() || "AG";
}

function displayPhone(phone) {
  if (!phone) return "Not set";
  return phone.replace(/^\+/, "");
}

export default function AccountProfile({ account, onUpdated }) {
  const token = getAccessToken();
  const inputRef = useRef(null);
  const [status, setStatus] = useState({ loading: false, error: "", notice: "" });
  const fullName = `${account?.first_name || ""} ${account?.last_name || ""}`.trim();
  const isCompany = account?.account_type === "company";
  const hasPhoto = Boolean(account?.profile_picture_url);

  async function handleFileChange(event) {
    const file = event.target.files?.[0];
    event.target.value = "";
    if (!file) return;

    if (!ALLOWED_TYPES.has(file.type)) {
      setStatus({ loading: false, error: "Use a JPG, PNG, or WebP image.", notice: "" });
      return;
    }
    if (file.size > MAX_AVATAR_BYTES) {
      setStatus({ loading: false, error: "Profile picture must be 512 KB or smaller.", notice: "" });
      return;
    }

    setStatus({ loading: true, error: "", notice: "" });
    try {
      const dataUrl = await new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onload = () => resolve(String(reader.result || ""));
        reader.onerror = () => reject(new Error("Could not read that image."));
        reader.readAsDataURL(file);
      });
      const updated = await updateAccountProfile({ profile_picture_url: dataUrl }, token);
      saveStoredAccount(updated);
      onUpdated?.(updated);
      setStatus({ loading: false, error: "", notice: "Saved" });
    } catch (error) {
      setStatus({ loading: false, error: error.message, notice: "" });
    }
  }

  async function removePhoto() {
    setStatus({ loading: true, error: "", notice: "" });
    try {
      const updated = await updateAccountProfile({ profile_picture_url: null }, token);
      saveStoredAccount(updated);
      onUpdated?.(updated);
      setStatus({ loading: false, error: "", notice: "Saved" });
    } catch (error) {
      setStatus({ loading: false, error: error.message, notice: "" });
    }
  }

  return (
    <section className="account-profile-page">
      <header className="account-profile-head">
        <p className="account-profile-eyebrow">{isCompany ? "Company workspace" : "Personal workspace"}</p>
        <h1>Profile</h1>
        <p>Manage your personal information and how you appear across Gentic.</p>
        <p className="account-profile-meta">
          {isCompany ? "Company account" : "Personal account"} · {isCompany ? "Company" : "Individual"}
        </p>
      </header>

      <div className="account-profile-section">
        <div className="account-profile-identity">
          <div className="account-profile-avatar">
            {hasPhoto ? (
              <img src={account.profile_picture_url} alt="" />
            ) : (
              <span>{accountInitials(account)}</span>
            )}
          </div>
          <div className="account-profile-identity-copy">
            <strong>{fullName}</strong>
            <div className="account-profile-identity-actions">
              <button
                type="button"
                className="account-profile-link"
                disabled={status.loading}
                onClick={() => inputRef.current?.click()}
              >
                {hasPhoto ? "Change photo" : "Upload photo"}
              </button>
              {hasPhoto && (
                <>
                  <span aria-hidden="true">·</span>
                  <button
                    type="button"
                    className="account-profile-link subtle"
                    disabled={status.loading}
                    onClick={removePhoto}
                  >
                    Remove
                  </button>
                </>
              )}
            </div>
            <input
              ref={inputRef}
              type="file"
              accept="image/jpeg,image/png,image/webp"
              hidden
              onChange={handleFileChange}
            />
          </div>
        </div>

        <div className="account-profile-fields">
          <label>
            <span>Name</span>
            <input value={fullName} readOnly disabled />
          </label>
          <label>
            <span>Email</span>
            <input value={account?.email || ""} readOnly disabled />
            <small>Your Gentic email address</small>
          </label>
          <label>
            <span>Phone</span>
            <input value={displayPhone(account?.phone_number)} readOnly disabled />
          </label>
        </div>

        <div className="account-profile-footer">
          {status.error && <p className="form-error" role="alert">{status.error}</p>}
          {status.notice && !status.error && (
            <p className="account-profile-saved" role="status">{status.notice}</p>
          )}
          {status.loading && !status.notice && (
            <p className="account-profile-saved" role="status">Saving…</p>
          )}
        </div>
      </div>
    </section>
  );
}