"use client";

/**
 * ProfileHeader — Instagram-style centered header used at the top of
 * /u/me and /u/[handle]. Avatar, display name, @handle, a single stat
 * line, and an action row.
 *
 * The action row hosts:
 *   • "Edit profile" link — only on the owner's own profile (via the
 *     `editHref` prop set by /u/me layout).
 *   • ReadingSettings gear — for every signed-in viewer, regardless of
 *     whose profile they're on. SiteHeader drops its own mobile gear
 *     for auth users (see comment there) so this is the single source
 *     of truth for that affordance once you're signed in.
 *
 * Anonymous visitors don't see this row at all — they read SiteHeader's
 * gear instead.
 */

import Image from "next/image";
import Link from "next/link";
import { ReadingSettings } from "@/components/reading-settings";
import { useAuth } from "@/components/auth/auth-provider";

export function ProfileHeader({
  avatarURL,
  name,
  handle,
  postCount,
  joinedAt,
  editHref,
}: {
  avatarURL: string | null;
  name: string;
  handle: string;
  postCount?: number;
  joinedAt?: string;
  /** When provided, shows an "Edit profile" CTA below the handle. */
  editHref?: string;
}) {
  const { user, loading } = useAuth();
  // ReadingSettings appears for every authenticated viewer (own profile
  // OR someone else's), so an auth user reading a friend's profile can
  // still reach theme/palette/font controls. Anonymous viewers fall back
  // to SiteHeader's mobile gear.
  const showReadingSettings = !loading && !!user;
  const showActions = !!editHref || showReadingSettings;

  return (
    <header className="flex flex-col items-center text-center gap-4 pt-4 pb-6 sm:pt-6 sm:pb-8">
      <Avatar src={avatarURL} name={name} />
      <div className="space-y-1">
        <h1 className="font-[family-name:var(--font-title)] font-semibold text-xl sm:text-2xl text-foreground leading-tight">
          {name}
        </h1>
        <p className="text-sm text-muted-foreground">@{handle}</p>
        {typeof postCount === "number" || joinedAt ? (
          <p className="text-xs text-muted-foreground">
            {typeof postCount === "number" ? (
              <>
                <span className="tabular-nums">{postCount}</span> post
                {postCount === 1 ? "" : "s"}
              </>
            ) : null}
            {typeof postCount === "number" && joinedAt ? " · " : null}
            {joinedAt ? <>Joined {new Date(joinedAt).toLocaleDateString()}</> : null}
          </p>
        ) : null}
      </div>
      {showActions ? (
        <div className="flex items-center gap-2">
          {editHref ? (
            <Link
              href={editHref}
              className="inline-flex items-center justify-center h-9 px-5 rounded-lg border border-border text-sm font-medium text-foreground hover:bg-muted transition-colors"
            >
              Edit profile
            </Link>
          ) : null}
          {showReadingSettings ? <ReadingSettings /> : null}
        </div>
      ) : null}
    </header>
  );
}

function Avatar({ src, name }: { src: string | null; name: string }) {
  if (src) {
    return (
      <Image
        src={src}
        alt={name}
        width={112}
        height={112}
        className="size-24 sm:size-28 rounded-full object-cover ring-1 ring-foreground/10"
        unoptimized
      />
    );
  }
  const initials =
    name
      .split(/\s+/)
      .map((p) => p[0])
      .slice(0, 2)
      .join("")
      .toUpperCase() || "?";
  return (
    <div className="size-24 sm:size-28 rounded-full bg-primary/15 text-primary flex items-center justify-center text-3xl font-semibold ring-1 ring-foreground/10">
      {initials}
    </div>
  );
}