"use client";

import { useState, useEffect } from "react";
import { useQuery } from "@tanstack/react-query";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { ProjectCard } from "@/components/projects/ProjectCard";
import { NewProjectDialog } from "@/components/projects/NewProjectDialog";
import { Plus, Search, Loader2 } from "lucide-react";

export default function ProjectsPage() {
  const [search, setSearch] = useState("");
  const [showNew, setShowNew] = useState(false);

  const { data, isLoading, isError } = useQuery({
    queryKey: ["projects", search],
    queryFn: async () => {
      const res = await fetch(`/api/projects?q=${encodeURIComponent(search)}`);
      if (!res.ok) throw new Error("Failed to fetch projects");
      return res.json() as Promise<{ projects: any[] }>;
    },
    staleTime: 30_000,
  });

  const { data: clientsData } = useQuery({
    queryKey: ["clients"],
    queryFn: async () => {
      const res = await fetch("/api/clients");
      if (!res.ok) return { clients: [] };
      return res.json() as Promise<{ clients: { id: string; company: string }[] }>;
    },
    staleTime: 60_000,
  });

  const projects = data?.projects ?? [];
  const clients = clientsData?.clients ?? [];

  const SCROLL_KEY = 'projects-scroll';

  useEffect(() => {
    if (!isLoading) {
      const saved = sessionStorage.getItem(SCROLL_KEY);
      if (saved) {
        sessionStorage.removeItem(SCROLL_KEY);
        requestAnimationFrame(() => window.scrollTo(0, parseInt(saved, 10)));
      }
    }
  }, [isLoading]);

  const saveScroll = () => sessionStorage.setItem(SCROLL_KEY, String(window.scrollY));

  return (
    <div className="p-8 space-y-6 max-w-[1600px] mx-auto">
      <div className="flex items-center justify-between gap-4 mb-8">
        <div>
          <h1 className="text-3xl font-bold text-white">Projects</h1>
          <p className="text-zinc-400 mt-1">
            {projects.length} project{projects.length !== 1 ? "s" : ""}
          </p>
        </div>
        <Button onClick={() => setShowNew(true)} className="gap-2">
          <Plus className="h-4 w-4" />
          New Project
        </Button>
      </div>

      {/* Search */}
      <div className="relative max-w-sm">
        <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 text-muted-foreground" />
        <Input
          placeholder="Search projects..."
          value={search}
          onChange={(e) => setSearch(e.target.value)}
          className="pl-9"
        />
      </div>

      {/* Grid */}
      {isLoading ? (
        <div className="flex justify-center py-12">
          <Loader2 className="h-6 w-6 animate-spin text-muted-foreground" />
        </div>
      ) : isError ? (
        <div className="text-center py-12 text-muted-foreground">
          <p>Could not load projects.</p>
          <p className="text-xs mt-2">Check server logs and database connectivity, then refresh.</p>
        </div>
      ) : projects.length === 0 ? (
        <div className="text-center py-12 text-muted-foreground">
          <p>No projects found.</p>
          <Button
            variant="outline"
            size="sm"
            className="mt-4"
            onClick={() => setShowNew(true)}
          >
            Create your first project
          </Button>
        </div>
      ) : (
        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-4">
          {projects.map((project) => (
            <div key={project.id} onClick={saveScroll}>
              <ProjectCard project={project} />
            </div>
          ))}
        </div>
      )}

      <NewProjectDialog
        open={showNew}
        onClose={() => setShowNew(false)}
        clients={clients}
      />
    </div>
  );
}