"use client";

import { useEffect, useState } from "react";
import { CalendarPlus, Pencil, X } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";

export interface AuditFormValues {
  id: string;
  type: "INTERNAL" | "EXTERNAL";
  title: string;
  plannedDate: string | null;
  scope: string | null;
  assessmentLevel: string | null;
  provider: string | null;
  auditorUserId: string | null;
  interval: string | null;
}

/**
 * Popup zum Anlegen bzw. Bearbeiten eines Audits (V5A). Overlay-/Karten-Optik bewusst
 * identisch zum bestehenden `Modal`/`Popup`. Der Typ (intern/extern) schaltet lokal die
 * jeweils passenden Felder frei: extern → Assessment-Level + Prüfdienstleister,
 * intern → Auditor + Turnus. Gespeichert wird über die als `action` übergebene
 * Server-Action (`createAudit` bzw. `updateAudit.bind(null, id)`), die anschließend
 * navigiert (Redirect) — daher kein manuelles Schließen nach dem Submit nötig.
 */
export function AuditDialog({
  action,
  users,
  audit,
  mode,
}: {
  action: (formData: FormData) => void | Promise<void>;
  users: { id: string; name: string | null }[];
  audit?: AuditFormValues;
  mode: "create" | "edit";
}) {
  const [open, setOpen] = useState(false);
  const [type, setType] = useState<"INTERNAL" | "EXTERNAL">(audit?.type ?? "EXTERNAL");
  const initialInterval = audit?.interval ?? "";

  useEffect(() => {
    if (!open) return;
    const onKey = (e: KeyboardEvent) => {
      if (e.key === "Escape") setOpen(false);
    };
    document.addEventListener("keydown", onKey);
    const prev = document.body.style.overflow;
    document.body.style.overflow = "hidden";
    return () => {
      document.removeEventListener("keydown", onKey);
      document.body.style.overflow = prev;
    };
  }, [open]);

  const isExternal = type === "EXTERNAL";
  const selectCls = "h-8 w-full rounded-md border border-input bg-background px-2 text-[12.5px]";
  const labelCls = "mb-1 block text-[12px] font-medium text-muted-foreground";

  return (
    <>
      {mode === "create" ? (
        <Button type="button" onClick={() => setOpen(true)}>
          <CalendarPlus className="size-4" /> Neues Audit planen
        </Button>
      ) : (
        <Button type="button" variant="outline" size="sm" onClick={() => setOpen(true)}>
          <Pencil className="size-3.5" /> Bearbeiten
        </Button>
      )}

      {open && (
        <div
          className="fixed inset-0 z-50 flex items-start justify-center overflow-y-auto bg-black/30 p-6 backdrop-blur-[2px]"
          onClick={(e) => {
            if (e.target === e.currentTarget) setOpen(false);
          }}
        >
          <div className="shadow-card my-auto w-full max-w-lg rounded-2xl border bg-card">
            <div className="flex items-start justify-between gap-3 border-b p-5">
              <div>
                <p className="font-heading text-[15px] font-semibold">
                  {mode === "create" ? "Neues Audit planen" : "Audit bearbeiten"}
                </p>
                <p className="mt-0.5 text-[12.5px] text-muted-foreground">
                  Intern = anlegen &amp; terminieren. Extern = Vorbereitung im Wizard.
                </p>
              </div>
              <button
                type="button"
                title="Schließen"
                onClick={() => setOpen(false)}
                className="rounded-md p-1 text-muted-foreground hover:bg-muted hover:text-foreground"
              >
                <X className="size-4.5" />
              </button>
            </div>

            <form action={action} className="space-y-4 p-5">
              {/* Typ */}
              <div>
                <span className={labelCls}>Audit-Typ</span>
                <div className="flex gap-2">
                  {(["INTERNAL", "EXTERNAL"] as const).map((v) => (
                    <label
                      key={v}
                      className={`flex flex-1 cursor-pointer items-center justify-center gap-2 rounded-lg border px-3 py-2 text-[12.5px] ${
                        type === v ? "border-[var(--primary)] bg-[var(--surface-soft)] font-semibold" : ""
                      }`}
                    >
                      <input
                        type="radio"
                        name="type"
                        value={v}
                        checked={type === v}
                        onChange={() => setType(v)}
                        className="accent-[var(--primary)]"
                      />
                      {v === "INTERNAL" ? "Internes Audit" : "Externes Audit"}
                    </label>
                  ))}
                </div>
              </div>

              <div>
                <label className={labelCls} htmlFor="audit-title">Titel</label>
                <Input id="audit-title" name="title" required defaultValue={audit?.title ?? ""} placeholder="z. B. TISAX-Assessment 2026" className="h-8 text-[12.5px]" />
              </div>

              <div className="grid grid-cols-2 gap-3">
                <div>
                  <label className={labelCls} htmlFor="audit-date">Termin</label>
                  <Input id="audit-date" name="plannedDate" defaultValue={audit?.plannedDate ?? ""} placeholder="z. B. 24.–25.09.2026" className="h-8 text-[12.5px]" />
                </div>
                {isExternal ? (
                  <div>
                    <label className={labelCls} htmlFor="audit-level">Assessment-Level</label>
                    <select id="audit-level" name="assessmentLevel" defaultValue={audit?.assessmentLevel ?? ""} className={selectCls}>
                      <option value="">— wählen —</option>
                      <option value="AL2">AL2</option>
                      <option value="AL3">AL3</option>
                    </select>
                  </div>
                ) : (
                  <div>
                    <label className={labelCls} htmlFor="audit-interval">Turnus</label>
                    <Input id="audit-interval" name="interval" defaultValue={initialInterval} placeholder="z. B. jährlich" className="h-8 text-[12.5px]" />
                  </div>
                )}
              </div>

              {isExternal ? (
                <div>
                  <label className={labelCls} htmlFor="audit-provider">Prüfdienstleister</label>
                  <Input id="audit-provider" name="provider" defaultValue={audit?.provider ?? ""} placeholder="z. B. DEKRA, TÜV …" className="h-8 text-[12.5px]" />
                </div>
              ) : (
                <div>
                  <label className={labelCls} htmlFor="audit-auditor">Auditor (unabhängig)</label>
                  <select id="audit-auditor" name="auditorUserId" defaultValue={audit?.auditorUserId ?? ""} className={selectCls}>
                    <option value="">— wählen —</option>
                    {users.map((u) => (
                      <option key={u.id} value={u.id}>{u.name ?? u.id}</option>
                    ))}
                  </select>
                </div>
              )}

              <div>
                <label className={labelCls} htmlFor="audit-scope">Scope / Geltungsbereich</label>
                <Textarea id="audit-scope" name="scope" rows={2} defaultValue={audit?.scope ?? ""} placeholder="Standorte, Prüfziele, Bereiche …" className="text-[12.5px]" />
              </div>

              <div className="flex justify-end gap-2 border-t pt-3">
                <Button type="button" variant="outline" size="sm" onClick={() => setOpen(false)}>Abbrechen</Button>
                <Button type="submit" size="sm">{mode === "create" ? "Audit anlegen" : "Speichern"}</Button>
              </div>
            </form>
          </div>
        </div>
      )}
    </>
  );
}