"use client";

import { useRouter } from "next/navigation";
import { useState } from "react";
import { promoteEmployee } from "@/actions/employees";
import { Button } from "@/components/ui/Button";
import { SelectField, TextField } from "@/components/ui/Field";
import { SlideOver } from "@/components/ui/SlideOver";
import { useToast } from "@/components/ui/Toast";
import type { Database, PaygradeType } from "@/lib/supabase/types";

type EmployeeRow = Database["public"]["Tables"]["employees"]["Row"];

const PAYGRADES: { value: PaygradeType; label: string }[] = [
  { value: "A", label: "A – Einstieg" },
  { value: "B", label: "B – Qualifiziert" },
  { value: "C", label: "C – Erfahren" },
  { value: "D", label: "D – Spezialist:in" },
  { value: "E", label: "E – Teamleitung" },
  { value: "F", label: "F – Bereichsleitung / GF" },
];

export function PromotePanel({ open, onClose, employee }: { open: boolean; onClose: () => void; employee: EmployeeRow }) {
  const { showToast } = useToast();
  const router = useRouter();
  const [effectiveDate, setEffectiveDate] = useState("");
  const [newTitle, setNewTitle] = useState(employee.job_title);
  const [paygrade, setPaygrade] = useState<PaygradeType>(employee.paygrade);
  const [pending, setPending] = useState(false);

  async function handleSubmit() {
    if (!effectiveDate || !newTitle) {
      showToast("Bitte alle Pflichtfelder ausfüllen.", "error");
      return;
    }
    setPending(true);
    const result = await promoteEmployee({
      employee_id: employee.id,
      effective_date: effectiveDate,
      new_title: newTitle,
      new_paygrade: paygrade,
    });
    setPending(false);
    if (result.success) {
      showToast(`${employee.first_name} ${employee.last_name} wurde befördert.`);
      router.refresh();
      onClose();
    } else {
      showToast(result.error ?? "Fehler beim Speichern.", "error");
    }
  }

  return (
    <SlideOver
      open={open}
      onClose={onClose}
      title="Beförderung"
      subtitle={`${employee.first_name} ${employee.last_name} · ${employee.job_title}`}
      footer={
        <>
          <Button variant="ghost" onClick={onClose}>
            Abbrechen
          </Button>
          {/* Promotion keeps its own purple, matching the Beförderung badge
              used in the history tab. */}
          <Button onClick={handleSubmit} pending={pending} className="!bg-purple-text text-white hover:brightness-110">
            Befördern
          </Button>
        </>
      }
    >
      <div className="flex flex-col gap-4">
        <TextField label="Wirksam ab" required type="date" value={effectiveDate} onChange={setEffectiveDate} />
        <TextField label="Neue Position" required value={newTitle} onChange={setNewTitle} />
        <SelectField
          label="Paygrade"
          value={paygrade}
          onChange={(v) => setPaygrade(v as PaygradeType)}
          options={PAYGRADES}
        />
      </div>
    </SlideOver>
  );
}
