"use client";

import { useState, useMemo, useCallback } from "react";
import Link from "next/link";
import type { FileRecord } from "@/lib/store";

type SortOrder = "newest" | "oldest" | "name" | "size-desc" | "size-asc";
type TypeFilter = "all" | "backerup" | "config";

function formatBytes(n: number) {
  if (n < 1024) return `${n} B`;
  if (n < 1024 * 1024) return `${(n / 1024).toFixed(1)} KB`;
  return `${(n / 1024 / 1024).toFixed(2)} MB`;
}

function formatDate(s: string) {
  return new Date(s).toLocaleDateString("en-US", {
    month: "short",
    day: "numeric",
    year: "numeric",
  });
}

function SearchIcon() {
  return (
    <svg viewBox="0 0 24 24" className="w-4 h-4" fill="none" stroke="currentColor" strokeWidth="2" aria-hidden="true">
      <circle cx="11" cy="11" r="8" />
      <path d="m21 21-4.35-4.35" />
    </svg>
  );
}

function ArrowIcon() {
  return (
    <svg viewBox="0 0 24 24" className="w-4 h-4" fill="none" stroke="currentColor" strokeWidth="2" aria-hidden="true">
      <path d="M5 12h14M12 5l7 7-7 7" />
    </svg>
  );
}

function XIcon() {
  return (
    <svg viewBox="0 0 24 24" className="w-3.5 h-3.5" fill="none" stroke="currentColor" strokeWidth="2.5" aria-hidden="true">
      <path strokeLinecap="round" d="M18 6 6 18M6 6l12 12" />
    </svg>
  );
}

function SortIcon() {
  return (
    <svg viewBox="0 0 24 24" className="w-4 h-4" fill="none" stroke="currentColor" strokeWidth="2" aria-hidden="true">
      <path strokeLinecap="round" strokeLinejoin="round" d="M3 7h18M6 12h12M10 17h4" />
    </svg>
  );
}

function TrashIcon() {
  return (
    <svg viewBox="0 0 24 24" className="w-3.5 h-3.5" fill="none" stroke="currentColor" strokeWidth="2" aria-hidden="true">
      <path strokeLinecap="round" strokeLinejoin="round" d="M14.74 9l-.346 9m-4.788 0L9.26 9m9.968-3.21c.342.052.682.107 1.022.166m-1.022-.165L18.16 19.673a2.25 2.25 0 01-2.244 2.077H8.084a2.25 2.25 0 01-2.244-2.077L4.772 5.79m14.456 0a48.108 48.108 0 00-3.478-.397m-12 .562c.34-.059.68-.114 1.022-.165m0 0a48.11 48.11 0 013.478-.397m7.5 0v-.916c0-1.18-.91-2.164-2.09-2.201a51.964 51.964 0 00-3.32 0c-1.18.037-2.09 1.022-2.09 2.201v.916m7.5 0a48.667 48.667 0 00-7.5 0" />
    </svg>
  );
}

export default function BrowseClient({
  records: allRecords,
  groups,
  isAdmin = false,
}: {
  records: FileRecord[];
  groups: string[];
  isAdmin?: boolean;
}) {
  const [records, setRecords] = useState<FileRecord[]>(allRecords);
  const [search, setSearch] = useState("");
  const [selectedGroup, setSelectedGroup] = useState<string | null>(null);
  const [typeFilter, setTypeFilter] = useState<TypeFilter>("all");
  const [sort, setSort] = useState<SortOrder>("newest");
  const [deleting, setDeleting] = useState<string | null>(null);

  const handleDelete = useCallback(async (token: string, name: string, e: React.MouseEvent) => {
    e.preventDefault();
    e.stopPropagation();
    if (!confirm(`Delete "${name}"?\n\nThis permanently removes the file and cannot be undone.`)) return;
    setDeleting(token);
    try {
      const res = await fetch(`/api/files/${token}`, { method: "DELETE" });
      if (res.ok) {
        setRecords((prev) => prev.filter((r) => r.token !== token));
      } else {
        const data = await res.json().catch(() => ({})) as { error?: string };
        alert(data.error ?? `Delete failed (${res.status})`);
      }
    } catch {
      alert("Network error – could not delete file");
    } finally {
      setDeleting(null);
    }
  }, []);

  const filtered = useMemo(() => {
    let r = records;

    if (search.trim()) {
      const q = search.toLowerCase();
      r = r.filter(
        (rec) =>
          rec.displayName?.toLowerCase().includes(q) ||
          rec.originalName.toLowerCase().includes(q) ||
          rec.description?.toLowerCase().includes(q) ||
          rec.containerName?.toLowerCase().includes(q) ||
          rec.image?.toLowerCase().includes(q) ||
          rec.group?.toLowerCase().includes(q)
      );
    }

    if (selectedGroup) r = r.filter((rec) => rec.group === selectedGroup);
    if (typeFilter !== "all") r = r.filter((rec) => rec.type === typeFilter);

    const sorted = [...r];
    switch (sort) {
      case "newest":
        sorted.sort((a, b) => new Date(b.uploadedAt).getTime() - new Date(a.uploadedAt).getTime());
        break;
      case "oldest":
        sorted.sort((a, b) => new Date(a.uploadedAt).getTime() - new Date(b.uploadedAt).getTime());
        break;
      case "name":
        sorted.sort((a, b) =>
          (a.displayName ?? a.originalName).localeCompare(b.displayName ?? b.originalName)
        );
        break;
      case "size-desc":
        sorted.sort((a, b) => b.size - a.size);
        break;
      case "size-asc":
        sorted.sort((a, b) => a.size - b.size);
        break;
    }

    return sorted;
  }, [records, search, selectedGroup, typeFilter, sort]);

  const activeFilters =
    (search.trim() ? 1 : 0) + (selectedGroup ? 1 : 0) + (typeFilter !== "all" ? 1 : 0);

  function clearAll() {
    setSearch("");
    setSelectedGroup(null);
    setTypeFilter("all");
    setSort("newest");
  }

  return (
    <div>
      {/* ── Search + Sort row ── */}
      <div className="mb-5 flex flex-col gap-3 sm:flex-row sm:items-center">
        <div className="relative flex-1">
          <span className="absolute left-3.5 top-1/2 -translate-y-1/2 text-slate-500 pointer-events-none">
            <SearchIcon />
          </span>
          <input
            type="search"
            placeholder="Search by name, image, description, group…"
            value={search}
            onChange={(e) => setSearch(e.target.value)}
            className="w-full rounded-xl border border-white/8 bg-white/4 pl-10 pr-4 py-2.5 text-sm text-slate-200 placeholder-slate-600 outline-none focus:border-cyan-500/40 focus:bg-white/6 transition-all"
          />
          {search && (
            <button
              onClick={() => setSearch("")}
              className="absolute right-3 top-1/2 -translate-y-1/2 text-slate-500 hover:text-slate-300 transition-colors"
            >
              <XIcon />
            </button>
          )}
        </div>

        <div className="flex items-center gap-2">
          <span className="text-slate-600 shrink-0">
            <SortIcon />
          </span>
          <select
            value={sort}
            onChange={(e) => setSort(e.target.value as SortOrder)}
            className="rounded-xl border border-white/8 bg-slate-900 px-3 py-2.5 text-sm text-slate-300 outline-none focus:border-cyan-500/40 transition-all cursor-pointer"
          >
            <option value="newest">Newest first</option>
            <option value="oldest">Oldest first</option>
            <option value="name">Name A–Z</option>
            <option value="size-desc">Largest first</option>
            <option value="size-asc">Smallest first</option>
          </select>
        </div>
      </div>

      {/* ── Filter pills ── */}
      <div className="mb-8 flex flex-wrap items-center gap-2">
        {/* Type pills */}
        {(["all", "backerup", "config"] as TypeFilter[]).map((t) => (
          <button
            key={t}
            onClick={() => setTypeFilter(t)}
            className={`rounded-full px-3.5 py-1.5 text-xs font-semibold transition-all ${
              typeFilter === t
                ? t === "all"
                  ? "bg-cyan-500 text-slate-900"
                  : t === "backerup"
                  ? "bg-cyan-500/20 border border-cyan-500/50 text-cyan-300"
                  : "bg-violet-500/20 border border-violet-500/50 text-violet-300"
                : "border border-white/8 bg-white/3 text-slate-500 hover:border-white/16 hover:text-slate-300"
            }`}
          >
            {t === "all" ? "All types" : t === "backerup" ? ".backerup" : ".json config"}
          </button>
        ))}

        {groups.length > 0 && (
          <>
            <div className="h-5 w-px bg-white/8 mx-1" />
            {groups.map((g) => (
              <button
                key={g}
                onClick={() => setSelectedGroup(selectedGroup === g ? null : g)}
                className={`rounded-full px-3.5 py-1.5 text-xs font-semibold transition-all ${
                  selectedGroup === g
                    ? "bg-violet-500/20 border border-violet-500/50 text-violet-300"
                    : "border border-white/8 bg-white/3 text-slate-500 hover:border-white/16 hover:text-slate-300"
                }`}
              >
                {selectedGroup === g && (
                  <span className="mr-1 inline-block w-1.5 h-1.5 rounded-full bg-violet-400" />
                )}
                {g}
              </button>
            ))}
          </>
        )}

        {activeFilters > 0 && (
          <button
            onClick={clearAll}
            className="ml-auto flex items-center gap-1.5 text-xs text-slate-500 hover:text-slate-300 transition-colors"
          >
            <XIcon />
            Clear filters ({activeFilters})
          </button>
        )}
      </div>

      {/* ── Results count ── */}
      <p className="mb-5 text-xs text-slate-600">
        {filtered.length === records.length
          ? `${records.length} file${records.length !== 1 ? "s" : ""} shared by the community`
          : `${filtered.length} of ${records.length} files`}
      </p>

      {/* ── Cards ── */}
      {filtered.length === 0 ? (
        <div className="rounded-2xl border border-white/5 glass p-20 text-center">
          <div className="text-5xl mb-5">🔍</div>
          <p className="font-semibold text-white">No results found</p>
          <p className="mt-2 text-sm text-slate-500">Try adjusting your search or clearing some filters.</p>
          {activeFilters > 0 && (
            <button
              onClick={clearAll}
              className="mt-5 text-sm text-cyan-400 hover:text-cyan-300 transition-colors"
            >
              Clear all filters
            </button>
          )}
        </div>
      ) : (
        <div className="grid gap-4 sm:grid-cols-2">
          {filtered.map((r) => (
            <div key={r.token} className="group/card rounded-2xl border border-white/5 glass card-hover overflow-hidden">
              <Link
                href={`/files/${r.token}`}
                className="group block px-5 pt-5 pb-3"
              >
              <div className="flex items-start justify-between gap-3">
                <div className="min-w-0 flex-1">
                  {/* Badges */}
                  <div className="flex flex-wrap items-center gap-2">
                    {r.type === "backerup" ? (
                      <span className="rounded-full bg-cyan-500/12 border border-cyan-500/20 px-2.5 py-0.5 text-[11px] font-semibold text-cyan-400">
                        .backerup
                      </span>
                    ) : (
                      <span className="rounded-full bg-violet-500/12 border border-violet-500/20 px-2.5 py-0.5 text-[11px] font-semibold text-violet-400">
                        .json config
                      </span>
                    )}
                    {r.group && (
                      <span className="rounded-full bg-white/4 border border-white/8 px-2.5 py-0.5 text-[11px] font-medium text-slate-400">
                        {r.group}
                      </span>
                    )}
                  </div>

                  {/* Title */}
                  {(r.displayName ?? r.containerName) ? (
                    <p className="mt-2.5 font-semibold text-white truncate group-hover:text-cyan-300 transition-colors">
                      {r.displayName ?? r.containerName}
                    </p>
                  ) : (
                    <p className="mt-2.5 font-mono text-sm text-slate-400 truncate">
                      {r.originalName}
                    </p>
                  )}

                  {/* Image */}
                  {r.image && (
                    <p className="mt-0.5 font-mono text-xs text-slate-500 truncate">{r.image}</p>
                  )}

                  {/* Description */}
                  {r.description && (
                    <p className="mt-2 text-sm text-slate-400 line-clamp-2 leading-relaxed">
                      {r.description}
                    </p>
                  )}
                </div>

                {/* Arrow */}
                <span className="shrink-0 text-slate-700 group-hover:text-cyan-400 group-hover:translate-x-1 transition-all mt-1">
                  <ArrowIcon />
                </span>
              </div>
            </Link>

            {/* Card footer: meta row + admin delete inline */}
            <div className="flex items-center gap-3 px-5 pb-4 text-xs text-slate-600">
              <span>{formatBytes(r.size)}</span>
              <span className="text-slate-800">·</span>
              <span>{formatDate(r.uploadedAt)}</span>
              {r.containerName && r.displayName && (
                <>
                  <span className="text-slate-800">·</span>
                  <span className="font-mono truncate">{r.containerName}</span>
                </>
              )}
              {isAdmin && (
                <button
                  onClick={(e) => handleDelete(r.token, r.displayName ?? r.containerName ?? r.originalName, e)}
                  disabled={deleting === r.token}
                  className="ml-auto flex items-center gap-1 rounded-md px-1.5 py-1 opacity-0 group-hover/card:opacity-100 transition-opacity hover:text-rose-400 hover:bg-rose-500/10 active:scale-95 disabled:opacity-40 text-slate-600"
                  title="Delete file"
                  aria-label="Delete file"
                >
                  {deleting === r.token
                    ? <span className="w-3 h-3 rounded-full border border-rose-400 border-t-transparent animate-spin" />
                    : <TrashIcon />}
                </button>
              )}
            </div>
          </div>
          ))}
        </div>
      )}
    </div>
  );
}