import Link from "next/link";
import { redirect } from "next/navigation";
import { getSession } from "../../lib/auth";
import { getDb, listRikxRondes, type ProjectListItem } from "../../lib/db";
import { PROJECT_STATUSES, isProjectStatus } from "../../lib/projectStatus";
import { AppHeader } from "../AppHeader";
import { AutoSubmitSelect } from "./AutoSubmitSelect";
import { ProjectPipeline } from "./ProjectPipeline";
import { ProjectTable } from "./ProjectTable";

const fieldClass =
  "w-full h-10 rounded-lg border border-zinc-300 dark:border-zinc-700 bg-white dark:bg-zinc-800 px-3 text-sm text-zinc-900 dark:text-zinc-100 placeholder:text-zinc-400 focus:outline-none focus:ring-2 focus:ring-rikx-orange";
const labelClass = "block text-sm text-zinc-700 dark:text-zinc-300 mb-1";

export default async function ProjectenPage({
  searchParams,
}: {
  searchParams: Promise<{ q?: string; status?: string; ronde?: string; weergave?: string }>;
}) {
  const session = await getSession();
  if (!session) redirect("/login");

  const params = await searchParams;
  const q = (params.q ?? "").trim();
  const status = isProjectStatus(params.status) ? params.status : "";
  const rondes = listRikxRondes();
  // "geen" = projecten zonder ronde; anders het id van een bestaande ronde
  const ronde =
    params.ronde === "geen" || rondes.some((r) => String(r.id) === params.ronde) ? params.ronde! : "";
  // Pipeline is altijd de standaardweergave; de tabel alleen als die expliciet gekozen is.
  const view = params.weergave === "tabel" ? "tabel" : "pipeline";

  const where: string[] = [];
  const args: (string | number)[] = [];
  if (q) {
    where.push("p.name LIKE ? ESCAPE '\\'");
    args.push(`%${q.replace(/[\\%_]/g, (c) => `\\${c}`)}%`);
  }
  if (status) {
    where.push("p.status = ?");
    args.push(status);
  }
  if (ronde === "geen") {
    where.push("p.ronde_id IS NULL");
  } else if (ronde) {
    where.push("p.ronde_id = ?");
    args.push(Number(ronde));
  }
  const projects = getDb()
    .prepare(
      `SELECT p.*, r.label AS ronde_label
       FROM projects p LEFT JOIN rikx_rondes r ON r.id = p.ronde_id
       ${where.length ? `WHERE ${where.join(" AND ")}` : ""}
       ORDER BY p.created_at DESC, p.id DESC`
    )
    .all(...args) as ProjectListItem[];
  const isFiltered = Boolean(q || status || ronde);

  function viewHref(target: "pipeline" | "tabel") {
    const sp = new URLSearchParams();
    if (target === "tabel") sp.set("weergave", "tabel");
    if (status) sp.set("status", status);
    if (ronde) sp.set("ronde", ronde);
    if (q) sp.set("q", q);
    const qs = sp.toString();
    return qs ? `/projecten?${qs}` : "/projecten";
  }

  const toggleClass = (isActive: boolean) =>
    isActive
      ? "rounded-lg bg-zinc-900 dark:bg-zinc-100 px-5 py-2.5 text-sm font-medium text-white dark:text-zinc-900"
      : "rounded-lg px-5 py-2.5 text-sm text-zinc-700 dark:text-zinc-300 hover:bg-zinc-100 dark:hover:bg-zinc-800 transition-colors";

  return (
    <div className="min-h-screen bg-zinc-50 dark:bg-zinc-950">
      <AppHeader email={session.email} active="projecten" />

      <main className="max-w-[96rem] mx-auto px-4 sm:px-6 py-6 flex flex-col gap-6">
        <div className="bg-white dark:bg-zinc-900 rounded-xl border border-zinc-200 dark:border-zinc-800 p-4 sm:p-5 flex flex-wrap items-end gap-4">
          <nav aria-label="Weergave" className="flex items-center gap-1">
            <Link href={viewHref("pipeline")} className={toggleClass(view === "pipeline")} aria-current={view === "pipeline" ? "page" : undefined}>
              Pipeline
            </Link>
            <Link href={viewHref("tabel")} className={toggleClass(view === "tabel")} aria-current={view === "tabel" ? "page" : undefined}>
              Tabel
            </Link>
          </nav>

          <form action="/projecten" className="contents">
            {view === "tabel" && <input type="hidden" name="weergave" value="tabel" />}
            <div className="w-full sm:w-56">
              <label htmlFor="filter-status" className={labelClass}>
                Status
              </label>
              <AutoSubmitSelect id="filter-status" name="status" defaultValue={status} className={fieldClass}>
                <option value="">Alle</option>
                {PROJECT_STATUSES.map((s) => (
                  <option key={s.id} value={s.id}>
                    {s.label}
                  </option>
                ))}
              </AutoSubmitSelect>
            </div>
            <div className="w-full sm:w-56">
              <label htmlFor="filter-ronde" className={labelClass}>
                Rikx Ronde
              </label>
              <AutoSubmitSelect id="filter-ronde" name="ronde" defaultValue={ronde} className={fieldClass}>
                <option value="">Alle</option>
                {rondes.map((r) => (
                  <option key={r.id} value={r.id}>
                    {r.label}
                  </option>
                ))}
                <option value="geen">Zonder ronde</option>
              </AutoSubmitSelect>
            </div>
            <div className="w-full sm:w-auto sm:flex-1 sm:min-w-56">
              <label htmlFor="filter-q" className={labelClass}>
                Zoeken
              </label>
              <input
                id="filter-q"
                type="search"
                name="q"
                defaultValue={q}
                placeholder="Projectnaam"
                className={fieldClass}
              />
            </div>
          </form>

          <Link
            href="/projecten/nieuw"
            className="rounded-lg bg-rikx-maroon hover:bg-rikx-maroon-light px-5 py-2.5 text-sm font-medium text-white transition-colors whitespace-nowrap"
          >
            + Project toevoegen
          </Link>
        </div>

        {isFiltered && (
          <div className="flex items-center gap-4 text-sm">
            <p className="text-zinc-500">
              {projects.length} {projects.length === 1 ? "project" : "projecten"} gevonden
            </p>
            <Link
              href={view === "tabel" ? "/projecten?weergave=tabel" : "/projecten"}
              className="text-rikx-orange-dark hover:underline"
            >
              Filters wissen
            </Link>
          </div>
        )}

        {view === "pipeline" ? (
          <ProjectPipeline projects={projects} status={status} />
        ) : (
          <ProjectTable projects={projects} isFiltered={isFiltered} />
        )}
      </main>
    </div>
  );
}