"use client";

import { useMemo, useState } from "react";
import { FILTERS } from "@/lib/ui-config";
import type { AppState, Dispatch } from "@/lib/app-state";
import { Header, IconBtn, OfflineBanner, EmptyState } from "@/components/ui-primitives";
import { PlaceCard } from "@/components/place-card";
import { Icons } from "@/components/icons";

export function PlacesListScreen({
  state,
  dispatch,
}: {
  state: AppState;
  dispatch: Dispatch;
}) {
  const { filter, search, places, offline } = state;
  const [searchOpen, setSearchOpen] = useState(false);

  const filtered = useMemo(() => {
    let out = places;
    if (filter !== "all") {
      if (filter === "visited") out = out.filter((p) => p.visited);
      else if (filter === "unvisited") out = out.filter((p) => !p.visited);
      else out = out.filter((p) => p.category === filter);
    }
    if (search.trim()) {
      const s = search.toLowerCase();
      out = out.filter(
        (p) =>
          p.name.toLowerCase().includes(s) ||
          p.address.toLowerCase().includes(s) ||
          p.tags.some((t) => t.toLowerCase().includes(s)),
      );
    }
    return out;
  }, [filter, search, places]);

  return (
    <div className="app-surface">
      <Header
        big
        title="Địa điểm"
        subtitle={`${places.length} chỗ đã lưu · ${places.filter((p) => p.visited).length} đã đến`}
        right={
          <IconBtn
            icon="Search"
            label="Tìm"
            onClick={() => setSearchOpen((v) => !v)}
            variant="muted"
          />
        }
      />
      {offline && <OfflineBanner />}
      {searchOpen && (
        <div style={{ padding: "0 16px 12px" }}>
          <div className="input" style={{ height: 44 }}>
            <Icons.Search
              size={18}
              stroke={1.75}
              style={{ color: "var(--muted-foreground)" }}
            />
            <input
              autoFocus
              placeholder="Tên quán, địa chỉ, tag..."
              value={search}
              onChange={(e) =>
                dispatch({ type: "SET_SEARCH", value: e.target.value })
              }
            />
            {search && (
              <button
                type="button"
                onClick={() => dispatch({ type: "SET_SEARCH", value: "" })}
                style={{
                  background: "transparent",
                  border: 0,
                  color: "var(--muted-foreground)",
                }}
              >
                <Icons.X size={16} stroke={2} />
              </button>
            )}
          </div>
        </div>
      )}

      <div
        className="no-scrollbar"
        style={{
          display: "flex",
          gap: 8,
          padding: "0 16px 12px",
          overflowX: "auto",
          overflowY: "hidden",
          scrollSnapType: "x proximity",
        }}
      >
        {FILTERS.map((f) => (
          <button
            key={f.id}
            className="pill"
            data-active={filter === f.id}
            onClick={() => dispatch({ type: "SET_FILTER", value: f.id })}
          >
            {f.label}
          </button>
        ))}
      </div>

      <div className="app-scroll">
        {filtered.length === 0 ? (
          <EmptyState
            icon={search ? "Search" : "MapPin"}
            title={search ? "Không tìm thấy gì" : "Chưa có địa điểm nào"}
            body={
              search
                ? `Không có địa điểm nào khớp với "${search}".`
                : "Bấm nút + để lưu địa điểm đầu tiên — quán cà phê quen, chỗ ăn ngon, hay nơi muốn đến."
            }
          />
        ) : (
          <div
            style={{
              display: "flex",
              flexDirection: "column",
              gap: 10,
              padding: "4px 16px 24px",
            }}
          >
            {filtered.map((p, i) => (
              <div
                key={p.id}
                className="page-enter"
                style={{ animationDelay: `${i * 18}ms` }}
              >
                <PlaceCard
                  place={p}
                  onTap={() =>
                    dispatch({ type: "NAV", screen: "place", placeId: p.id })
                  }
                />
              </div>
            ))}
          </div>
        )}
      </div>
    </div>
  );
}