/**
 * Renders the header of a user's profile, where the signed-in user also edits
 * their own avatar and email.
 *
 * @module
 */

import { useRef, useState } from "react";
import { Link } from "react-router";
import { t } from "@lingui/core/macro";
import { Trans } from "@lingui/react/macro";
import { API_URL } from "../../config/api.ts";
import type { Wire } from "../../../shared/api.ts";
import type {
  PublicUser,
  SelfUser,
  UpdateUserRequest,
} from "../../../shared/user.ts";
import { expectOk, parseAPIResponse } from "../../utils/shared/api.ts";
import { deserializeSelfUser } from "../../utils/shared/deserialize.ts";
import { useAuth } from "../../hooks/auth/useAuth.ts";
import { Avatar } from "../shared/Avatar.tsx";
import { ErrorCard } from "../shared/ErrorCard.tsx";
import { FollowUserButton } from "../social/FollowButton.tsx";
import { InlineEdit } from "../form/InlineEdit.tsx";
import { ProfileOwnActions } from "./ProfileOwnActions.tsx";
import { RoleChip } from "./RoleSwitcher.tsx";
import { userPath } from "../../../shared/paths.ts";
import { splitHandle } from "../../../shared/validation.ts";
import { homeUrl } from "../../utils/auth/home.ts";

/** Passed to {@link ProfileHeader} by `UserPublicProfile`, once loaded. */
export interface ProfileHeaderProps {
  user: PublicUser;
  isOwnProfile: boolean;
  /** Called with the user as a new avatar left them. */
  onUserChange: (user: PublicUser) => void;
}

/**
 * Renders the avatar, username, role and inviter, and for a user from another
 * instance, a link to their profile there. Visitors get a follow button. On
 * their own profile, users change their avatar (`PUT /api/me/avatar`) and
 * email (`PATCH /api/me`), unless their account comes from another instance, and invite
 * someone; their settings, the site's tools and logging out are in the
 * header's avatar menu.
 */
export function ProfileHeader(
  { user, isOwnProfile, onUserChange }: ProfileHeaderProps,
): React.JSX.Element {
  const { user: me, authFetch, updateSession } = useAuth();
  const [uploading, setUploading] = useState(false);
  const [avatarError, setAvatarError] = useState<string | null>(null);
  const fileInputRef = useRef<HTMLInputElement>(null);
  const { name, host } = splitHandle(user.username);
  // A user from another instance changes their avatar and email there.
  const editable = isOwnProfile && !host;

  const handleAvatarUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (!file) return;
    setAvatarError(null);
    setUploading(true);
    try {
      const formData = new FormData();
      formData.append("file", file);
      const res = await authFetch(`${API_URL}/api/me/avatar`, {
        method: "PUT",
        body: formData,
      });
      const body = parseAPIResponse<Wire<SelfUser>>(await res.json());
      if (!body.success) {
        setAvatarError(body.error.message);
        return;
      }
      const self = deserializeSelfUser(body.data);
      updateSession({ user: self });
      onUserChange(self);
    } catch {
      setAvatarError(t`Upload failed`);
    } finally {
      setUploading(false);
      if (fileInputRef.current) fileInputRef.current.value = "";
    }
  };

  const handleEmailSave = async (email: string) => {
    await expectOk<Wire<PublicUser>>(
      await authFetch(`${API_URL}/api/me`, {
        method: "PATCH",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ email } satisfies UpdateUserRequest),
      }),
    );
    if (me) updateSession({ user: { ...me, email } });
  };

  return (
    <div className="profile-header">
      <div className="profile-avatar-wrapper">
        <Avatar
          userId={user.id}
          username={user.username}
          hasAvatar={!!user.avatarMime}
          size={128}
          version={user.updatedAt?.getTime()}
        />
        {editable && (
          <label className="avatar-change-overlay" title={t`Change avatar`}>
            {uploading ? "…" : "✎"}
            <input
              ref={fileInputRef}
              type="file"
              accept="image/jpeg,image/png,image/gif,image/webp"
              onChange={handleAvatarUpload}
              disabled={uploading}
              style={{ display: "none" }}
            />
          </label>
        )}
      </div>
      <div className="profile-info">
        <div className="profile-username-row">
          <h1 className="profile-username">
            {name}
            {host && <span className="profile-username-host">@{host}</span>}
          </h1>
          <RoleChip role={user.role} />
        </div>
        {user.invitedByUsername
          ? (
            <p className="profile-invited-by">
              <Trans>invited by</Trans>{" "}
              <Link
                to={userPath(user.invitedByUsername)}
                className="profile-invited-by-link"
              >
                @{user.invitedByUsername}
              </Link>
            </p>
          )
          // Without an inviter, a local user was here first; one from a
          // trusted instance just came in.
          : !host && (
            <p className="profile-invited-by profile-invited-by--founding">
              O.G.
            </p>
          )}
        {host && (
          <p className="profile-home">
            <Trans>
              Account on{" "}
              <a href={homeUrl(user.username) ?? undefined}>{host}</a>
            </Trans>
          </p>
        )}
        {editable && (
          <InlineEdit
            value={me?.email ?? ""}
            editable
            label={t`Edit email`}
            onSave={handleEmailSave}
            kind="email"
            required
            className="profile-email"
          >
            <span className="profile-email-text">
              {me?.email ?? t`Add email…`}
            </span>
          </InlineEdit>
        )}
        {avatarError && (
          <ErrorCard
            title={t`Failed to update avatar`}
            message={avatarError}
          />
        )}
        {!isOwnProfile && (
          <FollowUserButton
            targetUserId={user.id}
            targetUsername={user.username}
          />
        )}
        {isOwnProfile && <ProfileOwnActions />}
      </div>
    </div>
  );
}