"use client";

import { type FormEvent, useState } from "react";
import { FormModal } from "../components/form-modal";
import type {
  CreateEstimateBalanceInput,
  EstimateBalanceDto,
  EstimateBalanceTemplate,
} from "../types";
import { estimateTextLimits } from "./estimate-balance-document";
import { getTodayIsoDate } from "./estimate-balance-format";

export interface EstimateBalanceCreateDefaults {
  name?: string;
  workStage?: string | null;
  template?: EstimateBalanceTemplate;
  copyFromBalanceId?: string;
}

interface EstimateBalanceCreateModalProps {
  balances: EstimateBalanceDto[];
  defaults: EstimateBalanceCreateDefaults;
  isSaving: boolean;
  onClose: () => void;
  onCreate: (input: CreateEstimateBalanceInput) => void;
}

/** "Neuer Stand": name, LPH, date and the starting content. */
export function EstimateBalanceCreateModal({
  balances,
  defaults,
  isSaving,
  onClose,
  onCreate,
}: EstimateBalanceCreateModalProps) {
  const [name, setName] = useState(defaults.name ?? "");
  const [workStage, setWorkStage] = useState(defaults.workStage ?? "");
  const [dateIso, setDateIso] = useState(getTodayIsoDate());
  const [template, setTemplate] = useState<EstimateBalanceTemplate>(
    defaults.template ?? "kg400"
  );
  const [copyFromBalanceId, setCopyFromBalanceId] = useState(
    defaults.copyFromBalanceId ?? balances[0]?.id ?? ""
  );
  const isCopyInvalid = template === "copy" && !copyFromBalanceId;

  function handleSubmit(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    if (!name.trim() || isCopyInvalid) {
      return;
    }
    onCreate({
      name: name.trim(),
      workStage: workStage.trim() || null,
      dateIso: dateIso || null,
      template,
      ...(template === "copy" ? { copyFromBalanceId } : {}),
    });
  }

  return (
    <FormModal
      isSaving={isSaving}
      onClose={onClose}
      onSubmit={handleSubmit}
      submitDisabled={!name.trim() || isCopyInvalid}
      submitLabel="Stand anlegen"
      title="Neuer Stand"
    >
      <div className="row g-3">
        <div className="col-12 col-md-6">
          <label className="form-label" htmlFor="estimate-create-name">
            Bezeichnung
          </label>
          <input
            autoFocus
            className="form-control"
            id="estimate-create-name"
            maxLength={estimateTextLimits.balanceName}
            onChange={(event) => setName(event.target.value)}
            placeholder="z. B. Entwurfsplanung"
            required
            value={name}
          />
        </div>
        <div className="col-6 col-md-3">
          <label className="form-label" htmlFor="estimate-create-work-stage">
            LPH
          </label>
          <input
            className="form-control"
            id="estimate-create-work-stage"
            maxLength={estimateTextLimits.workStage}
            onChange={(event) => setWorkStage(event.target.value)}
            placeholder="z. B. LPH 3"
            value={workStage}
          />
        </div>
        <div className="col-6 col-md-3">
          <label className="form-label" htmlFor="estimate-create-date">
            Datum
          </label>
          <input
            className="form-control"
            id="estimate-create-date"
            onChange={(event) => setDateIso(event.target.value)}
            type="date"
            value={dateIso}
          />
        </div>
        <div className="col-12 col-md-6">
          <label className="form-label" htmlFor="estimate-create-template">
            Inhalt
          </label>
          <select
            className="form-select"
            id="estimate-create-template"
            onChange={(event) =>
              setTemplate(event.target.value as EstimateBalanceTemplate)
            }
            value={template}
          >
            <option value="kg400">Vorlage KG 400</option>
            <option value="empty">Leer</option>
            <option disabled={!balances.length} value="copy">
              Kopie von …
            </option>
          </select>
        </div>
        {template === "copy" ? (
          <div className="col-12 col-md-6">
            <label className="form-label" htmlFor="estimate-create-copy-from">
              Kopie von Stand
            </label>
            <select
              className="form-select"
              id="estimate-create-copy-from"
              onChange={(event) => setCopyFromBalanceId(event.target.value)}
              required
              value={copyFromBalanceId}
            >
              {balances.map((balance) => (
                <option key={balance.id} value={balance.id}>
                  {balance.workStage ? `${balance.name} (${balance.workStage})` : balance.name}
                </option>
              ))}
            </select>
          </div>
        ) : null}
        <div className="col-12">
          <p className="text-secondary small mb-0">
            {template === "kg400"
              ? "Legt die Kostengruppen 410 bis 480 und „Allgemein“ ohne Einträge an."
              : template === "empty"
                ? "Legt einen Stand ohne Kostengruppen an."
                : "Übernimmt alle Kostengruppen und Zeilen des gewählten Stands."}
          </p>
        </div>
      </div>
    </FormModal>
  );
}