import React, { useState } from 'react'
import ProfileCoverEditor from './ProfileCoverEditor'
import LevelBadge from '../xp/LevelBadge'
import XPProgressBar from '../xp/XPProgressBar'
import FollowButton from '../social/FollowButton'
import FollowersPreview from '../social/FollowersPreview'
import MutualFollowersBadge from '../social/MutualFollowersBadge'

function formatCompactNumber(value) {
  const numeric = Number(value ?? 0)
  return numeric.toLocaleString()
}

export default function ProfileHero({ user, profile, isOwner, viewerIsFollowing, followerCount, recentFollowers = [], followContext = null, heroBgUrl, countryName, leaderboardRank, extraActions = null }) {
  const [following, setFollowing] = useState(viewerIsFollowing)
  const [count, setCount] = useState(followerCount)
  const [editorOpen, setEditorOpen] = useState(false)
  const [coverUrl, setCoverUrl] = useState(user?.cover_url || heroBgUrl || null)
  const [coverPosition, setCoverPosition] = useState(Number.isFinite(user?.cover_position) ? user.cover_position : 50)

  const uname = user.username || user.name || 'Unknown'
  const displayName = user.name || uname
  const joinDate = user.created_at
    ? new Date(user.created_at).toLocaleDateString('en-US', { month: 'long', year: 'numeric' })
    : null
  const bio = profile?.bio || profile?.about || ''
  const progressPercent = Math.round(Number(user?.progress_percent ?? 0))
  const heroStats = [
    { label: 'Followers', value: formatCompactNumber(count) },
    { label: 'Level', value: `Lv ${formatCompactNumber(user?.level ?? 1)}` },
  ]

  return (
    <>
      <div className="relative mx-auto max-w-7xl px-4 pt-4 md:pt-6">
        <div
          aria-hidden="true"
          className="pointer-events-none absolute inset-x-10 top-8 -z-10 h-44 rounded-full blur-3xl"
          style={{
            background: 'linear-gradient(90deg, rgba(56,189,248,0.18), rgba(249,115,22,0.14), rgba(59,130,246,0.12))',
          }}
        />

        <div className="relative overflow-hidden rounded-[32px] border border-white/10 bg-[#09111f]/80 shadow-[0_24px_80px_rgba(2,6,23,0.55)]">
          <div
            className="w-full h-[208px] md:h-[248px] xl:h-[288px]"
            style={{
              background: coverUrl
                ? `url('${coverUrl}') center ${coverPosition}% / cover no-repeat`
                : 'linear-gradient(140deg, #07101d 0%, #0b1726 42%, #07111e 100%)',
              position: 'relative',
            }}
          >
            <div className="absolute left-4 top-4 z-20 flex flex-wrap items-center gap-2 md:left-6 md:top-6">
              <span className="inline-flex items-center gap-2 rounded-full border border-white/15 bg-black/30 px-3 py-1.5 text-[11px] font-semibold uppercase tracking-[0.22em] text-slate-200 backdrop-blur-md">
                <span className="h-2 w-2 rounded-full bg-sky-400 shadow-[0_0_12px_rgba(56,189,248,0.9)]" />
                Creator profile
              </span>
              {leaderboardRank?.rank ? (
                <span className="inline-flex items-center gap-2 rounded-full border border-amber-300/20 bg-amber-300/10 px-3 py-1.5 text-[11px] font-semibold uppercase tracking-[0.18em] text-amber-100 backdrop-blur-md">
                  <i className="fa-solid fa-sparkles text-[10px]" />
                  Top #{leaderboardRank.rank} this week
                </span>
              ) : null}
            </div>

            {isOwner ? (
              <div className="absolute right-4 top-4 z-20 md:right-6 md:top-6">
                <button
                  type="button"
                  onClick={() => setEditorOpen(true)}
                  className="inline-flex items-center gap-2 rounded-full border border-white/20 bg-black/35 px-3.5 py-2 text-xs font-medium text-white backdrop-blur-md transition-colors hover:bg-black/55"
                  aria-label="Edit cover image"
                >
                  <i className="fa-solid fa-image" />
                  Edit Cover
                </button>
              </div>
            ) : null}

            <div
              className="absolute inset-0"
              style={{
                background: coverUrl
                  ? 'linear-gradient(180deg, rgba(2,6,23,0.16) 0%, rgba(2,6,23,0.28) 38%, rgba(2,6,23,0.9) 100%)'
                  : 'radial-gradient(ellipse at 16% 40%, rgba(77,163,255,.18) 0%, transparent 60%), radial-gradient(ellipse at 84% 22%, rgba(224,122,33,.14) 0%, transparent 54%)',
              }}
            />
            <div className="absolute inset-0 opacity-[0.06] pointer-events-none" style={{ backgroundImage: 'url(/gfx/noise.png)', backgroundSize: '32px' }} />
          </div>

          <div className="relative px-4 pb-6 md:px-7 md:pb-7">
            <div className="relative -mt-16 flex flex-col gap-5 md:-mt-20 md:flex-row md:items-start md:gap-6">
              <div className="mx-auto z-10 shrink-0 md:mx-0">
                <img
                  src={user.avatar_url || '/default/avatar_default.webp'}
                  alt={`${uname}'s avatar`}
                  className="h-[112px] w-[112px] rounded-[28px] border border-white/15 bg-[#0b1320] object-cover shadow-[0_0_0_8px_rgba(9,17,31,0.92),0_22px_44px_rgba(2,6,23,0.5)] md:h-[132px] md:w-[132px]"
                />
              </div>

              <div className="min-w-0 flex-1 text-center md:text-left">
                <div className="grid gap-5 xl:grid-cols-[minmax(0,1fr)_430px] xl:items-start">
                  <div className="min-w-0">
                    <div className="flex flex-wrap items-center justify-center gap-2 md:justify-start">
                      <span className="inline-flex items-center gap-2 rounded-full border border-white/10 bg-white/5 px-3 py-1 text-[11px] font-semibold uppercase tracking-[0.18em] text-slate-300">
                        <i className="fa-solid fa-stars text-[10px] text-sky-300" />
                        Profile spotlight
                      </span>
                    </div>

                    <h1 className="mt-3 text-[30px] font-semibold leading-tight tracking-[-0.03em] text-white md:text-[42px]">
                      {displayName}
                    </h1>
                    <p className="mt-1 font-mono text-sm text-slate-400 md:text-[15px]">@{uname}</p>

                    <div className="mt-4 flex flex-wrap items-center justify-center gap-2 md:justify-start">
                      <LevelBadge level={user?.level} rank={user?.rank} />
                      {!isOwner ? <MutualFollowersBadge context={followContext} /> : null}
                      {countryName ? (
                        <span className="inline-flex items-center gap-1.5 rounded-full border border-white/10 bg-white/5 px-3 py-1.5 text-xs text-slate-300">
                          {profile?.country_code ? (
                            <img
                              src={`/gfx/flags/shiny/24/${encodeURIComponent(String(profile.country_code).toUpperCase())}.png`}
                              alt={countryName}
                              className="h-auto w-4 rounded-sm"
                              onError={(event) => { event.target.style.display = 'none' }}
                            />
                          ) : null}
                          {countryName}
                        </span>
                      ) : null}
                      {joinDate ? (
                        <span className="inline-flex items-center gap-1.5 rounded-full border border-white/10 bg-white/5 px-3 py-1.5 text-xs text-slate-300">
                          <i className="fa-solid fa-calendar-days fa-fw text-slate-500" />
                          Joined {joinDate}
                        </span>
                      ) : null}
                      {profile?.website ? (
                        <a
                          href={profile.website.startsWith('http') ? profile.website : `https://${profile.website}`}
                          target="_blank"
                          rel="nofollow noopener noreferrer"
                          className="inline-flex items-center gap-1.5 rounded-full border border-sky-400/20 bg-sky-400/10 px-3 py-1.5 text-xs text-sky-200 transition-colors hover:border-sky-300/35 hover:bg-sky-400/15"
                        >
                          <i className="fa-solid fa-link fa-fw" />
                          {(() => {
                            try {
                              const url = profile.website.startsWith('http') ? profile.website : `https://${profile.website}`
                              return new URL(url).hostname
                            } catch {
                              return profile.website
                            }
                          })()}
                        </a>
                      ) : null}
                    </div>

                    {bio ? (
                      <p className="mx-auto mt-4 max-w-2xl text-sm leading-relaxed text-slate-300/90 md:mx-0 md:text-[15px]">
                        {bio}
                      </p>
                    ) : null}

                    <XPProgressBar
                      xp={user?.xp}
                      currentLevelXp={user?.current_level_xp}
                      nextLevelXp={user?.next_level_xp}
                      progressPercent={user?.progress_percent}
                      maxLevel={user?.max_level}
                      className="mt-4 max-w-3xl"
                    />
                  </div>

                  <div className="space-y-3 xl:pt-1">
                    {!isOwner && recentFollowers?.length > 0 ? (
                      <FollowersPreview
                        users={followContext?.follower_overlap?.users?.length ? followContext.follower_overlap.users : recentFollowers}
                        label={followContext?.follower_overlap?.label || `${formatCompactNumber(followerCount)} followers`}
                        href={`/@${uname}/activity`}
                      />
                    ) : null}

                    <div className="flex flex-wrap items-center justify-center gap-2 xl:flex-nowrap xl:justify-end">
                      {extraActions}
                      {isOwner ? (
                        <>
                          <a
                            href="/dashboard/profile"
                            className="inline-flex items-center gap-2 rounded-2xl border border-white/15 bg-white/[0.04] px-4 py-2.5 text-sm font-medium text-slate-200 transition-all hover:bg-white/[0.08] hover:text-white"
                            aria-label="Edit profile"
                          >
                            <i className="fa-solid fa-pen fa-fw" />
                            Edit Profile
                          </a>
                          <a
                            href="/studio"
                            className="inline-flex items-center gap-2 rounded-2xl bg-gradient-to-r from-sky-500 to-cyan-400 px-4 py-2.5 text-sm font-semibold text-slate-950 shadow-[0_18px_36px_rgba(14,165,233,0.28)] transition-transform hover:-translate-y-0.5"
                            aria-label="Open Studio"
                          >
                            <i className="fa-solid fa-wand-magic-sparkles fa-fw" />
                            Studio
                          </a>
                        </>
                      ) : (
                        <>
                          <FollowButton
                            username={uname}
                            initialFollowing={following}
                            initialCount={count}
                            className="shrink-0 whitespace-nowrap"
                            followingClassName="border border-emerald-400/40 bg-emerald-500/12 text-emerald-300 hover:bg-emerald-500/18"
                            idleClassName="border border-sky-400/40 bg-sky-500/12 text-sky-200 hover:bg-sky-500/20"
                            sizeClassName="px-3.5 py-2 text-sm"
                            onChange={({ following: nextFollowing, followersCount }) => {
                              setFollowing(nextFollowing)
                              setCount(followersCount)
                            }}
                          />

                          <button
                            type="button"
                            onClick={() => {
                              if (navigator.share) {
                                navigator.share({ title: `${displayName} on Skinbase`, url: window.location.href })
                              } else {
                                navigator.clipboard.writeText(window.location.href)
                              }
                            }}
                            aria-label="Share profile"
                            className="inline-flex shrink-0 items-center gap-2 whitespace-nowrap rounded-2xl border border-white/10 bg-white/[0.04] px-3.5 py-2 text-sm font-medium text-slate-300 transition-all hover:bg-white/[0.08] hover:text-white"
                          >
                            <i className="fa-solid fa-share-nodes fa-fw" />
                            Share
                          </button>
                        </>
                      )}
                    </div>

                    <div className="rounded-[24px] border border-white/10 bg-[linear-gradient(180deg,rgba(15,23,42,0.72),rgba(9,17,31,0.92))] p-3 text-left shadow-[inset_0_1px_0_rgba(255,255,255,0.04)]">
                      <div className="grid grid-cols-2 gap-2">
                        {heroStats.map((fact) => (
                          <div
                            key={fact.label}
                            className="rounded-2xl border border-white/10 bg-white/[0.04] px-3 py-2.5"
                          >
                            <div className="text-[10px] font-semibold uppercase tracking-[0.18em] text-slate-500">{fact.label}</div>
                            <div className="mt-1 text-sm font-semibold tracking-tight text-white md:text-[15px]">{fact.value}</div>
                          </div>
                        ))}
                      </div>

                      <div className="mt-2.5 flex flex-wrap items-center gap-2">
                        <span className="inline-flex items-center gap-1.5 rounded-full border border-white/10 bg-white/[0.04] px-3 py-1.5 text-[11px] font-medium text-slate-300">
                          <span className="h-1.5 w-1.5 rounded-full bg-cyan-300" />
                          Progress {progressPercent}%
                        </span>

                        {joinDate ? (
                          <span className="inline-flex items-center gap-1.5 rounded-full border border-white/10 bg-white/[0.04] px-3 py-1.5 text-[11px] font-medium text-slate-300">
                            <i className="fa-solid fa-calendar-days text-[10px] text-slate-500" />
                            Since {joinDate}
                          </span>
                        ) : null}
                      </div>
                    </div>
                  </div>
                </div>

              </div>
            </div>
          </div>
        </div>
      </div>

      <ProfileCoverEditor
        isOpen={editorOpen}
        onClose={() => setEditorOpen(false)}
        coverUrl={coverUrl}
        coverPosition={coverPosition}
        onCoverUpdated={(nextUrl, nextPosition) => {
          setCoverUrl(nextUrl)
          setCoverPosition(nextPosition)
        }}
        onCoverRemoved={() => {
          setCoverUrl(null)
          setCoverPosition(50)
        }}
      />
    </>
  )
}