import { useState } from "react";
import { useAlert } from "../context/AlertContext";
import { useAuth } from "../context/AuthContext";
import { Link } from "react-router-dom";
import Forbidden from "../components/Forbidden";
import { Skeleton } from "boneyard-js/react";
import ProjectsFixture from "../fixtures/ProjectsFixture";
import { motion } from "framer-motion";
import ConfirmModal from "../components/ConfirmModal";

import apiFetch from "../utils/api";
import { formatDate, czechPlural } from "../utils/formatters";
import SortIcon from "../components/SortIcon";
import useTableSort from "../hooks/useTableSort";
import { useQueryClient } from "@tanstack/react-query";
import { usePaginatedQuery } from "../hooks/usePaginatedQuery";
import { projectListOptions } from "../lib/queries/projects";
import Pagination from "../components/Pagination";

const API_BASE = "/api/admin";

const STATUS_LABELS: Record<string, string> = {
  aktivni: "Aktivní",
  dokonceny: "Dokončený",
  zruseny: "Zrušený",
};

const STATUS_CLASSES: Record<string, string> = {
  aktivni: "admin-badge-project-aktivni",
  dokonceny: "admin-badge-project-dokonceny",
  zruseny: "admin-badge-project-zruseny",
};

interface Project {
  id: number;
  project_number: string;
  name: string;
  customer_name: string;
  responsible_user_name: string;
  status: string;
  start_date: string;
  end_date: string;
  order_id?: number;
  order_number?: string;
}

export default function Projects() {
  const alert = useAlert();
  const { hasPermission } = useAuth();

  const { sort, order, handleSort, activeSort } =
    useTableSort("project_number");
  const [search, setSearch] = useState("");
  const [page, setPage] = useState(1);
  const [deletingId, setDeletingId] = useState<number | null>(null);
  const [deleteTarget, setDeleteTarget] = useState<Project | null>(null);
  const [deleteFiles, setDeleteFiles] = useState(false);

  const queryClient = useQueryClient();
  const {
    items: projects,
    pagination,
    isPending,
    isFetching,
  } = usePaginatedQuery<Project>(
    projectListOptions({ search, sort, order, page }),
  );

  if (!hasPermission("projects.view")) return <Forbidden />;

  const handleDelete = async () => {
    if (!deleteTarget) return;
    setDeletingId(deleteTarget.id);
    try {
      const res = await apiFetch(`${API_BASE}/projects/${deleteTarget.id}`, {
        method: "DELETE",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ delete_files: deleteFiles }),
      });
      const data = await res.json();
      if (data.success) {
        alert.success(data.message || "Projekt byl smazán");
        queryClient.invalidateQueries({ queryKey: ["projects"] });
        queryClient.invalidateQueries({ queryKey: ["orders"] });
        queryClient.invalidateQueries({ queryKey: ["offers"] });
      } else {
        alert.error(data.error || "Nepodařilo se smazat projekt");
      }
    } catch {
      alert.error("Chyba připojení");
    } finally {
      setDeletingId(null);
      setDeleteTarget(null);
      setDeleteFiles(false);
    }
  };

  return (
    <Skeleton name="projects" loading={isPending} fixture={<ProjectsFixture />}>
      <div>
        <motion.div
          className="admin-page-header"
          initial={{ opacity: 0, y: 12 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ duration: 0.25 }}
        >
          <div>
            <h1 className="admin-page-title">Projekty</h1>
            <p className="admin-page-subtitle">
              {pagination?.total ?? projects.length}{" "}
              {czechPlural(
                pagination?.total ?? projects.length,
                "projekt",
                "projekty",
                "projektů",
              )}
            </p>
          </div>
        </motion.div>

        <motion.div
          className="admin-card"
          initial={{ opacity: 0, y: 12 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ duration: 0.25, delay: 0.06 }}
          style={{ opacity: isFetching ? 0.6 : 1, transition: "opacity 0.2s" }}
        >
          <div className="admin-card-body">
            <div className="admin-search-bar mb-4">
              <input
                type="text"
                value={search}
                onChange={(e) => {
                  setSearch(e.target.value);
                  setPage(1);
                }}
                className="admin-form-input"
                placeholder="Hledat podle čísla, názvu nebo zákazníka..."
              />
            </div>

            {projects.length === 0 ? (
              <div className="admin-empty-state">
                <div className="admin-empty-icon">
                  <svg
                    width="28"
                    height="28"
                    viewBox="0 0 24 24"
                    fill="none"
                    stroke="currentColor"
                    strokeWidth="1.5"
                    strokeLinecap="round"
                    strokeLinejoin="round"
                  >
                    <path d="M22 19a2 2 0 0 1-2 2H4a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h5l2 3h9a2 2 0 0 1 2 2z" />
                  </svg>
                </div>
                <p>Zatím nejsou žádné projekty.</p>
                <p
                  style={{
                    color: "var(--text-tertiary)",
                    fontSize: "0.875rem",
                  }}
                >
                  Vytvořte první projekt tlačítkem výše nebo automaticky při
                  vytvoření objednávky.
                </p>
              </div>
            ) : (
              <div className="admin-table-responsive">
                <table className="admin-table">
                  <thead>
                    <tr>
                      <th
                        style={{ cursor: "pointer" }}
                        onClick={() => handleSort("project_number")}
                      >
                        Číslo{" "}
                        <SortIcon
                          column="project_number"
                          sort={activeSort}
                          order={order}
                        />
                      </th>
                      <th
                        style={{ cursor: "pointer" }}
                        onClick={() => handleSort("name")}
                      >
                        Název{" "}
                        <SortIcon
                          column="name"
                          sort={activeSort}
                          order={order}
                        />
                      </th>
                      <th>Zákazník</th>
                      <th>Zodpovědná osoba</th>
                      <th
                        style={{ cursor: "pointer" }}
                        onClick={() => handleSort("status")}
                      >
                        Stav{" "}
                        <SortIcon
                          column="status"
                          sort={activeSort}
                          order={order}
                        />
                      </th>
                      <th
                        style={{ cursor: "pointer" }}
                        onClick={() => handleSort("start_date")}
                      >
                        Začátek{" "}
                        <SortIcon
                          column="start_date"
                          sort={activeSort}
                          order={order}
                        />
                      </th>
                      <th
                        style={{ cursor: "pointer" }}
                        onClick={() => handleSort("end_date")}
                      >
                        Konec{" "}
                        <SortIcon
                          column="end_date"
                          sort={activeSort}
                          order={order}
                        />
                      </th>
                      <th>Objednávka</th>
                      <th>Akce</th>
                    </tr>
                  </thead>
                  <tbody>
                    {(projects as Project[]).map((p) => (
                      <tr key={p.id}>
                        <td className="admin-mono">
                          <Link
                            to={`/projects/${p.id}`}
                            className="link-accent"
                          >
                            {p.project_number}
                          </Link>
                        </td>
                        <td className="fw-500">{p.name || "—"}</td>
                        <td>{p.customer_name || "—"}</td>
                        <td>{p.responsible_user_name || "—"}</td>
                        <td>
                          <span
                            className={`admin-badge ${STATUS_CLASSES[p.status] || ""}`}
                          >
                            {STATUS_LABELS[p.status] || p.status}
                          </span>
                        </td>
                        <td className="admin-mono">
                          {formatDate(p.start_date)}
                        </td>
                        <td className="admin-mono">{formatDate(p.end_date)}</td>
                        <td>
                          {p.order_id ? (
                            <Link
                              to={`/orders/${p.order_id}`}
                              className="text-secondary"
                              style={{ textDecoration: "none" }}
                            >
                              {p.order_number}
                            </Link>
                          ) : (
                            "—"
                          )}
                        </td>
                        <td>
                          <div className="admin-table-actions">
                            <Link
                              to={`/projects/${p.id}`}
                              className="admin-btn-icon"
                              title="Upravit"
                              aria-label="Upravit"
                            >
                              <svg
                                width="18"
                                height="18"
                                viewBox="0 0 24 24"
                                fill="none"
                                stroke="currentColor"
                                strokeWidth="2"
                              >
                                <path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7" />
                                <path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z" />
                              </svg>
                            </Link>
                            {!p.order_id &&
                              hasPermission("projects.create") && (
                                <button
                                  onClick={() => setDeleteTarget(p)}
                                  className="admin-btn-icon danger"
                                  title="Smazat projekt"
                                  disabled={deletingId === p.id}
                                >
                                  {deletingId === p.id ? (
                                    <div className="admin-spinner admin-spinner-sm" />
                                  ) : (
                                    <svg
                                      width="18"
                                      height="18"
                                      viewBox="0 0 24 24"
                                      fill="none"
                                      stroke="currentColor"
                                      strokeWidth="2"
                                    >
                                      <polyline points="3 6 5 6 21 6" />
                                      <path d="M19 6l-1 14a2 2 0 0 1-2 2H8a2 2 0 0 1-2-2L5 6" />
                                      <path d="M10 11v6M14 11v6" />
                                    </svg>
                                  )}
                                </button>
                              )}
                          </div>
                        </td>
                      </tr>
                    ))}
                  </tbody>
                </table>
              </div>
            )}
            <Pagination pagination={pagination} onPageChange={setPage} />
          </div>
        </motion.div>

        <ConfirmModal
          isOpen={!!deleteTarget}
          onClose={() => {
            setDeleteTarget(null);
            setDeleteFiles(false);
          }}
          onConfirm={handleDelete}
          title="Smazat projekt"
          message={
            <>
              Opravdu chcete smazat projekt {deleteTarget?.project_number}?
              <label
                className="admin-form-checkbox"
                style={{ marginTop: "1rem", display: "flex" }}
              >
                <input
                  type="checkbox"
                  checked={deleteFiles}
                  onChange={(e) => setDeleteFiles(e.target.checked)}
                />
                <span>Smazat i soubory na disku</span>
              </label>
            </>
          }
          confirmText="Smazat"
          type="danger"
          loading={!!deletingId}
        />
      </div>
    </Skeleton>
  );
}
