"use client";

import { useState, useEffect, useCallback, use } from "react";
import { useRouter } from "next/navigation";
import { useFamily } from "../../FamilyProvider";
import type { CirclePost, CircleComment, Circle } from "@/types";

const REACTIONS = ["❤️", "😂", "👍", "🙏", "😮"];

function timeAgo(iso: string) {
  const diff = Date.now() - new Date(iso).getTime();
  const m = Math.floor(diff / 60000);
  if (m < 1)  return "just now";
  if (m < 60) return `${m}m`;
  const h = Math.floor(m / 60);
  if (h < 24) return `${h}h`;
  return `${Math.floor(h / 24)}d`;
}

// ── Post card ─────────────────────────────────────────────────────────────────
function PostCard({
  post, myFamilyId, circleId, isAdmin,
  onDeleted, onReact,
}: {
  post: CirclePost;
  myFamilyId: string;
  circleId: string;
  isAdmin: boolean;
  onDeleted: (id: string) => void;
  onReact: (postId: string, emoji: string) => void;
}) {
  const [showComments, setShowComments] = useState(false);
  const [comments, setComments]         = useState<CircleComment[]>([]);
  const [commentText, setCommentText]   = useState("");
  const [posting, setPosting]           = useState(false);
  const [showMenu, setShowMenu]         = useState(false);
  const [reportSent, setReportSent]     = useState(false);
  const [deleteConfirm, setDeleteConfirm] = useState(false);

  const loadComments = async () => {
    const res  = await fetch(`/api/circles/${circleId}/posts/${post.id}/comments`);
    const data = await res.json();
    setComments(data.comments ?? []);
  };

  const toggleComments = () => {
    if (!showComments) loadComments();
    setShowComments(v => !v);
  };

  const addComment = async () => {
    if (!commentText.trim()) return;
    setPosting(true);
    await fetch(`/api/circles/${circleId}/posts/${post.id}/comments`, {
      method:  "POST",
      headers: { "Content-Type": "application/json" },
      body:    JSON.stringify({ body: commentText.trim() }),
    });
    setCommentText("");
    loadComments();
    setPosting(false);
  };

  const sendReport = async (reason: string) => {
    await fetch(`/api/circles/${circleId}/posts/${post.id}/report`, {
      method:  "POST",
      headers: { "Content-Type": "application/json" },
      body:    JSON.stringify({ reason }),
    });
    setReportSent(true);
    setShowMenu(false);
  };

  const deletePost = async () => {
    await fetch(`/api/circles/${circleId}/posts/${post.id}`, { method: "DELETE" });
    onDeleted(post.id);
  };

  const isOwn = post.authorFamilyId === myFamilyId;

  return (
    <div className="bg-white dark:bg-gray-800 rounded-2xl shadow-sm overflow-hidden">
      {/* Author row */}
      <div className="flex items-center justify-between px-4 pt-3 pb-2">
        <div className="flex items-center gap-2">
          <div className="w-8 h-8 bg-rose-100 dark:bg-rose-900/40 rounded-full flex items-center justify-center text-sm">👨‍👩‍👧</div>
          <div>
            <p className="text-sm font-medium">{post.authorFamilyName}</p>
            <p className="text-xs text-gray-400">{timeAgo(post.createdAt)}{post.sourceKind ? ` · shared a ${post.sourceKind}` : ""}</p>
          </div>
        </div>
        {/* ⋯ menu */}
        <div className="relative">
          <button onClick={() => setShowMenu(v => !v)} className="p-2 text-gray-400">⋯</button>
          {showMenu && (
            <>
              <div className="fixed inset-0 z-40" onClick={() => setShowMenu(false)} />
              <div className="absolute right-0 top-8 z-50 bg-white dark:bg-gray-900 rounded-xl shadow-xl border border-gray-100 dark:border-gray-700 min-w-[160px] py-1">
                {(isOwn || isAdmin) && (
                  <button
                    onClick={() => { setShowMenu(false); setDeleteConfirm(true); }}
                    className="w-full text-left px-4 py-2.5 text-sm text-red-500 hover:bg-red-50 dark:hover:bg-red-900/20"
                  >🗑️ Delete post</button>
                )}
                {!isOwn && !reportSent && (
                  <button
                    onClick={() => sendReport("inappropriate")}
                    className="w-full text-left px-4 py-2.5 text-sm hover:bg-gray-50 dark:hover:bg-gray-700"
                  >🚩 Report post</button>
                )}
                {reportSent && <p className="px-4 py-2.5 text-xs text-gray-400">Reported — thank you</p>}
              </div>
            </>
          )}
        </div>
      </div>

      {/* Delete confirmation */}
      {deleteConfirm && (
        <div className="mx-4 mb-3 p-3 bg-red-50 dark:bg-red-900/20 rounded-xl space-y-2">
          <p className="text-sm text-red-600 font-medium">Delete this post?</p>
          <div className="flex gap-2">
            <button onClick={deletePost} className="flex-1 py-1.5 bg-red-500 text-white rounded-lg text-sm">Delete</button>
            <button onClick={() => setDeleteConfirm(false)} className="flex-1 py-1.5 text-gray-400 text-sm">Cancel</button>
          </div>
        </div>
      )}

      {/* Body */}
      {post.body && <p className="px-4 pb-3 text-sm leading-relaxed">{post.body}</p>}

      {/* Image */}
      {post.imageUrl && (
        <img src={post.imageUrl} alt="Post" className="w-full max-h-80 object-cover" />
      )}

      {/* Reactions */}
      <div className="px-4 py-2 flex items-center gap-1 flex-wrap border-t border-gray-50 dark:border-gray-700">
        {REACTIONS.map(emoji => {
          const r = post.reactions.find(x => x.emoji === emoji);
          return (
            <button
              key={emoji}
              onClick={() => onReact(post.id, emoji)}
              className={`flex items-center gap-1 px-2 py-1 rounded-full text-xs transition-colors ${
                r?.includedMe
                  ? "bg-rose-100 dark:bg-rose-900/40 text-rose-600"
                  : "bg-gray-50 dark:bg-gray-700 text-gray-500"
              }`}
            >
              {emoji}{r?.count ? ` ${r.count}` : ""}
            </button>
          );
        })}
        <button
          onClick={toggleComments}
          className="ml-auto flex items-center gap-1 text-xs text-gray-400 px-2 py-1"
        >
          💬 {post.commentCount > 0 ? post.commentCount : ""} {showComments ? "▲" : "▼"}
        </button>
      </div>

      {/* Comments */}
      {showComments && (
        <div className="border-t border-gray-50 dark:border-gray-700 px-4 py-3 space-y-3">
          {comments.map(c => (
            <div key={c.id} className="flex gap-2">
              <div className="w-7 h-7 bg-rose-50 dark:bg-rose-900/30 rounded-full flex items-center justify-center text-xs flex-shrink-0">👨‍👩‍👧</div>
              <div className="flex-1 bg-gray-50 dark:bg-gray-700 rounded-xl px-3 py-2">
                <p className="text-xs font-medium text-gray-600 dark:text-gray-300">{c.authorFamilyName}</p>
                <p className="text-sm">{c.body}</p>
              </div>
            </div>
          ))}
          <div className="flex gap-2 pt-1">
            <input
              id="comment-input"
              name="comment-input"
              autoComplete="off"
              value={commentText}
              onChange={e => setCommentText(e.target.value)}
              onKeyDown={e => e.key === "Enter" && addComment()}
              placeholder="Add a comment…"
              className="flex-1 px-3 py-2 bg-gray-50 dark:bg-gray-700 rounded-xl text-sm outline-none"
            />
            <button
              onClick={addComment}
              disabled={posting || !commentText.trim()}
              className="px-3 py-2 bg-rose-400 text-white rounded-xl text-sm disabled:opacity-40"
            >→</button>
          </div>
        </div>
      )}
    </div>
  );
}

// ── Create Post Modal (C5 + C9 consent) ──────────────────────────────────────
function CreatePostModal({
  circleId, circleName, memberCount,
  onClose, onPosted,
}: {
  circleId: string;
  circleName: string;
  memberCount: number;
  onClose: () => void;
  onPosted: () => void;
}) {
  const [body, setBody]               = useState("");
  const [imageFile, setImageFile]     = useState<File | null>(null);
  const [imagePreview, setImagePreview] = useState<string | null>(null);
  const [posting, setPosting]         = useState(false);
  const [step, setStep]               = useState<"compose" | "confirm">("compose");
  const [postError, setPostError]     = useState<string | null>(null);

  const pickImage = (e: React.ChangeEvent<HTMLInputElement>) => {
    const f = e.target.files?.[0];
    if (!f) return;
    setImageFile(f);
    setImagePreview(URL.createObjectURL(f));
    setPostError(null);
  };

  const submit = async () => {
    setPosting(true);
    setPostError(null);
    try {
      let tmpKey: string | null = null;

      if (imageFile) {
        // Get presigned URL — pass both type and name so server can normalise empty types
        const presignRes = await fetch(`/api/circles/${circleId}/posts`, {
          method:  "POST",
          headers: { "Content-Type": "application/json" },
          body:    JSON.stringify({ action: "presign", contentType: imageFile.type, filename: imageFile.name }),
        });
        const presignData = await presignRes.json();
        if (!presignRes.ok || !presignData.uploadUrl) {
          setPostError(presignData.error ?? "Could not prepare image upload");
          setPosting(false);
          return;
        }
        // Upload directly to R2 using the normalised content type from server
        const uploadRes = await fetch(presignData.uploadUrl, {
          method:  "PUT",
          body:    imageFile,
          headers: { "Content-Type": presignData.contentType ?? imageFile.type },
        });
        if (!uploadRes.ok) {
          setPostError("Image upload failed — please try again");
          setPosting(false);
          return;
        }
        tmpKey = presignData.tmpKey;
      }

      const postRes  = await fetch(`/api/circles/${circleId}/posts`, {
        method:  "POST",
        headers: { "Content-Type": "application/json" },
        body:    JSON.stringify({ postBody: body, tmpKey }),
      });
      const postData = await postRes.json();
      if (!postRes.ok) {
        setPostError(postData.error ?? "Failed to create post");
        setPosting(false);
        return;
      }

      onPosted();
      onClose();
    } catch (err) {
      setPostError(err instanceof Error ? err.message : "Something went wrong");
    }
    setPosting(false);
  };

  return (
    <>
      <div className="fixed inset-0 bg-black/50 z-50" onClick={onClose} />
      <div className="fixed bottom-0 inset-x-0 z-50 bg-white dark:bg-gray-900 rounded-t-2xl p-4 pb-10 shadow-xl max-h-[85vh] flex flex-col">
        <div className="flex items-center justify-between mb-4">
          <h3 className="font-semibold">{step === "confirm" ? "Confirm post" : "New post"}</h3>
          <button onClick={onClose} className="text-gray-400">✕</button>
        </div>

        {step === "compose" ? (
          <>
            <textarea
              id="post-body"
              name="post-body"
              autoFocus
              value={body}
              onChange={e => setBody(e.target.value)}
              placeholder="What's on your mind?"
              rows={4}
              className="w-full px-3 py-2 bg-gray-50 dark:bg-gray-700 rounded-xl text-sm outline-none resize-none mb-3"
            />
            {imagePreview && (
              <div className="relative mb-3">
                <img src={imagePreview} alt="Preview" className="w-full max-h-48 object-cover rounded-xl" />
                <button
                  onClick={() => { setImageFile(null); setImagePreview(null); }}
                  className="absolute top-2 right-2 w-6 h-6 bg-black/50 text-white rounded-full text-xs"
                >✕</button>
              </div>
            )}
            <label className="flex items-center gap-2 text-sm text-gray-500 cursor-pointer mb-4">
              <span className="text-xl">📷</span> Add photo
              <input id="post-image" name="post-image" type="file" accept="image/*" className="hidden" onChange={pickImage} />
            </label>
            <button
              onClick={() => setStep("confirm")}
              disabled={!body.trim() && !imageFile}
              className="w-full py-3 bg-rose-400 text-white rounded-xl font-medium disabled:opacity-40"
            >Continue →</button>
          </>
        ) : (
          /* C9 — Explicit consent surface */
          <div className="flex-1 flex flex-col gap-4">
            <div className="p-4 bg-amber-50 dark:bg-amber-900/20 rounded-2xl border border-amber-200 dark:border-amber-700">
              <p className="text-sm font-semibold text-amber-800 dark:text-amber-200 mb-1">📣 Heads up</p>
              <p className="text-sm text-amber-700 dark:text-amber-300">
                This will be visible to all <strong>{memberCount} {memberCount === 1 ? "family" : "families"}</strong> in{" "}
                <strong>{circleName}</strong>.{" "}
                {imageFile && "The photo you selected will also be shared. "}
                Once posted, other members can see it.
              </p>
            </div>
            {body && <p className="text-sm bg-gray-50 dark:bg-gray-700 rounded-xl px-3 py-2 italic text-gray-600 dark:text-gray-300">"{body}"</p>}
            {postError && (
              <p className="text-sm text-red-600 bg-red-50 dark:bg-red-900/20 rounded-xl px-3 py-2 mb-2">
                ✗ {postError}
              </p>
            )}
            <div className="flex gap-3 mt-auto">
              <button onClick={() => setStep("compose")} className="flex-1 py-3 border border-gray-200 dark:border-gray-600 rounded-xl text-sm">← Edit</button>
              <button
                onClick={submit}
                disabled={posting}
                className="flex-1 py-3 bg-rose-400 text-white rounded-xl font-medium disabled:opacity-50"
              >{posting ? "Posting…" : "Post to Circle ✓"}</button>
            </div>
          </div>
        )}
      </div>
    </>
  );
}

// ── Circle feed page ──────────────────────────────────────────────────────────
export default function CircleFeedPage({ params }: { params: Promise<{ id: string }> }) {
  const { id: circleId } = use(params);
  const router            = useRouter();
  const { familyId }      = useFamily();

  const [circle, setCircle]       = useState<Circle | null>(null);
  const [posts, setPosts]         = useState<CirclePost[]>([]);
  const [loading, setLoading]     = useState(true);
  const [showCreate, setShowCreate] = useState(false);
  const [showMembers, setShowMembers] = useState(false);
  const [members, setMembers]     = useState<{ familyId: string; familyName: string; role: string }[]>([]);
  const [myRole, setMyRole]       = useState<"admin" | "member">("member");
  const [showInviteModal, setShowInviteModal] = useState(false);
  const [inviteEmail, setInviteEmail]         = useState("");
  const [inviteSending, setInviteSending]     = useState(false);
  const [inviteResult, setInviteResult]       = useState<{ type: "success" | "error"; msg: string } | null>(null);

  const fetchFeed = useCallback(async () => {
    try {
      const [circleRes, postsRes] = await Promise.all([
        fetch(`/api/circles/${circleId}`),
        fetch(`/api/circles/${circleId}/posts`),
      ]);
      const circleData = await circleRes.json();
      const postsData  = await postsRes.json();
      if (circleData.circle) {
        setCircle(circleData.circle);
        setMembers(circleData.members ?? []);
        setMyRole(circleData.circle.role ?? "member");
      }
      setPosts(postsData.posts ?? []);
    } catch { /* silent */ }
    setLoading(false);
  }, [circleId]);

  useEffect(() => { fetchFeed(); }, [fetchFeed]);

  const handleReact = async (postId: string, emoji: string) => {
    await fetch(`/api/circles/${circleId}/posts/${postId}/reactions`, {
      method:  "POST",
      headers: { "Content-Type": "application/json" },
      body:    JSON.stringify({ emoji }),
    });
    // Refresh just this post's reactions
    fetchFeed();
  };

  const handleInviteSend = async () => {
    if (!inviteEmail.trim()) return;
    setInviteSending(true);
    setInviteResult(null);
    try {
      const res  = await fetch(`/api/circles/${circleId}/invite`, {
        method:  "POST",
        headers: { "Content-Type": "application/json" },
        body:    JSON.stringify({ email: inviteEmail.trim() }),
      });
      const data = await res.json();
      if (data.success) {
        const msg = data.type === "in_app"
          ? `Invite sent! ${inviteEmail} will see it on their Circles page.`
          : `Invite email sent to ${inviteEmail}!`;
        setInviteResult({ type: "success", msg });
        setInviteEmail("");
      } else {
        setInviteResult({ type: "error", msg: data.error ?? "Failed to send invite" });
      }
    } catch {
      setInviteResult({ type: "error", msg: "Something went wrong" });
    }
    setInviteSending(false);
  };

  const handleLeave = async () => {
    if (!confirm("Leave this circle?")) return;
    const res = await fetch(`/api/circles/${circleId}/members`, { method: "DELETE" });
    const data = await res.json();
    if (data.success) router.push("/circle");
    else alert(data.error);
  };

  if (loading) {
    return (
      <div className="min-h-screen bg-gradient-to-br from-rose-50 to-amber-50 dark:from-gray-900 dark:to-gray-800 flex items-center justify-center">
        <div className="flex gap-3 text-3xl">
          {["👨‍👩‍👧", "💬", "❤️"].map((e, i) => (
            <span key={i} className="animate-bounce" style={{ animationDelay: `${i * 120}ms` }}>{e}</span>
          ))}
        </div>
      </div>
    );
  }

  if (!circle) {
    return (
      <div className="min-h-screen flex items-center justify-center text-gray-400">
        <div className="text-center">
          <p className="text-4xl mb-2">🔒</p>
          <p>Circle not found or you are not a member.</p>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-gradient-to-br from-rose-50 to-amber-50 dark:from-gray-900 dark:to-gray-800 pb-24">
      {/* Header */}
      <div className="p-4 flex items-center gap-3">
        <button onClick={() => router.push("/circle")} className="p-2 rounded-xl bg-white dark:bg-gray-800 shadow-sm text-xl">←</button>
        <div className="flex-1 min-w-0">
          <h1 className="text-lg font-bold truncate">{circle.name}</h1>
          <p className="text-xs text-gray-400">{circle.memberCount} {circle.memberCount === 1 ? "family" : "families"}</p>
        </div>
        {/* Members panel toggle */}
        <button
          onClick={() => setShowMembers(v => !v)}
          className="p-2 rounded-xl bg-white dark:bg-gray-800 shadow-sm text-sm"
        >👥</button>
        {/* Admin: invite */}
        {myRole === "admin" && (
          <button
            onClick={() => { setShowInviteModal(true); setInviteResult(null); setInviteEmail(""); }}
            className="px-3 py-2 bg-rose-400 text-white rounded-xl text-sm font-medium"
          >+ Invite</button>
        )}
      </div>

      {/* Members panel */}
      {showMembers && (
        <div className="mx-4 mb-4 bg-white dark:bg-gray-800 rounded-2xl shadow-sm p-4">
          <div className="flex items-center justify-between mb-3">
            <p className="font-medium text-sm">Members</p>
            <button onClick={handleLeave} className="text-xs text-red-400">Leave circle</button>
          </div>
          <div className="space-y-2">
            {members.map(m => (
              <div key={m.familyId} className="flex items-center justify-between">
                <div className="flex items-center gap-2">
                  <div className="w-7 h-7 bg-rose-100 dark:bg-rose-900/40 rounded-full flex items-center justify-center text-xs">👨‍👩‍👧</div>
                  <span className="text-sm">{m.familyName}</span>
                </div>
                <div className="flex items-center gap-2">
                  <span className={`text-xs px-2 py-0.5 rounded-full ${m.role === "admin" ? "bg-rose-100 text-rose-600" : "bg-gray-100 text-gray-500"}`}>
                    {m.role}
                  </span>
                  {myRole === "admin" && m.familyId !== familyId && (
                    <button
                      onClick={async () => {
                        await fetch(`/api/circles/${circleId}/members/${m.familyId}`, { method: "DELETE" });
                        fetchFeed();
                      }}
                      className="text-xs text-red-400"
                    >Remove</button>
                  )}
                </div>
              </div>
            ))}
          </div>
        </div>
      )}

      {/* Posts feed */}
      <div className="px-4 space-y-4">
        {posts.length === 0 ? (
          <div className="text-center py-16 px-8">
            <p className="text-4xl mb-3">💬</p>
            <p className="font-semibold text-gray-700 dark:text-gray-200">No posts yet</p>
            <p className="text-sm text-gray-400 mt-1">Be the first to share something with {circle.name}!</p>
          </div>
        ) : (
          posts.map(p => (
            <PostCard
              key={p.id}
              post={p}
              myFamilyId={familyId ?? ""}
              circleId={circleId}
              isAdmin={myRole === "admin"}
              onDeleted={id => setPosts(prev => prev.filter(x => x.id !== id))}
              onReact={handleReact}
            />
          ))
        )}
      </div>

      {/* FAB — create post */}
      <button
        onClick={() => setShowCreate(true)}
        className="fixed bottom-20 right-5 w-14 h-14 bg-rose-400 text-white rounded-full shadow-lg flex items-center justify-center text-2xl z-40"
      >+</button>

      {showCreate && circle && familyId && (
        <CreatePostModal
          circleId={circleId}
          circleName={circle.name}
          memberCount={circle.memberCount}
          onClose={() => setShowCreate(false)}
          onPosted={fetchFeed}
        />
      )}

      {/* Invite by email modal */}
      {showInviteModal && (
        <>
          <div className="fixed inset-0 bg-black/50 z-50" onClick={() => setShowInviteModal(false)} />
          <div className="fixed bottom-0 inset-x-0 z-50 bg-white dark:bg-gray-900 rounded-t-2xl p-5 pb-10 shadow-xl">
            <div className="flex items-center justify-between mb-4">
              <h3 className="font-semibold">Invite to {circle?.name}</h3>
              <button onClick={() => setShowInviteModal(false)} className="text-gray-400 text-xl">✕</button>
            </div>
            <p className="text-sm text-gray-500 mb-4">
              Enter the email address of the person you want to invite.
              If they already have a Tia account they'll get a notification;
              otherwise we'll email them a link to sign up and join.
            </p>
            <input
              id="invite-email"
              name="invite-email"
              type="email"
              autoFocus
              value={inviteEmail}
              onChange={e => setInviteEmail(e.target.value)}
              onKeyDown={e => e.key === "Enter" && handleInviteSend()}
              placeholder="their@email.com"
              className="w-full px-4 py-3 bg-gray-50 dark:bg-gray-700 rounded-xl text-sm outline-none mb-3 border border-gray-200 dark:border-gray-600"
            />
            {inviteResult && (
              <p className={`text-sm mb-3 px-3 py-2 rounded-xl ${
                inviteResult.type === "success"
                  ? "bg-green-50 dark:bg-green-900/20 text-green-700 dark:text-green-300"
                  : "bg-red-50 dark:bg-red-900/20 text-red-600 dark:text-red-300"
              }`}>
                {inviteResult.type === "success" ? "✓ " : "✗ "}{inviteResult.msg}
              </p>
            )}
            <button
              onClick={handleInviteSend}
              disabled={inviteSending || !inviteEmail.trim()}
              className="w-full py-3 bg-rose-400 text-white rounded-xl font-medium disabled:opacity-40"
            >
              {inviteSending ? "Sending…" : "Send Invite"}
            </button>
          </div>
        </>
      )}
    </div>
  );
}