"use client";

import { useRouter } from "next/navigation";
import { useState } from "react";

type EstimateAction = "approve" | "decline" | "question";

type EstimateActionsProps = {
  token: string;
};

type ActionResponse = {
  message?: string;
};

const actionLabels: Record<EstimateAction, string> = {
  approve: "Freigeben",
  decline: "Ablehnen",
  question: "Rückfrage senden",
};

async function readActionMessage(response: Response) {
  try {
    const body = await response.json() as ActionResponse;
    return body.message || "Die Aktion konnte nicht abgeschlossen werden.";
  } catch {
    return "Die Aktion konnte nicht abgeschlossen werden.";
  }
}

export function EstimateActions({ token }: EstimateActionsProps) {
  const router = useRouter();
  const [activeForm, setActiveForm] = useState<Exclude<EstimateAction, "approve"> | null>(null);
  const [message, setMessage] = useState("");
  const [pendingAction, setPendingAction] = useState<EstimateAction | null>(null);
  const [feedback, setFeedback] = useState<{ type: "success" | "error"; text: string } | null>(null);

  async function submitAction(action: EstimateAction, actionMessage = "") {
    setPendingAction(action);
    setFeedback(null);

    try {
      const response = await fetch(`/api/status/${encodeURIComponent(token)}/estimate/${action}`, {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({ message: actionMessage.trim() || null }),
      });
      const responseMessage = await readActionMessage(response);

      if (!response.ok) {
        setFeedback({ type: "error", text: responseMessage });
        return;
      }

      setMessage("");
      setActiveForm(null);
      setFeedback({ type: "success", text: responseMessage });
      router.refresh();
    } catch {
      setFeedback({
        type: "error",
        text: "Die Aktion konnte momentan nicht gesendet werden. Bitte versuchen Sie es erneut.",
      });
    } finally {
      setPendingAction(null);
    }
  }

  const isPending = pendingAction !== null;

  return (
    <div className="estimate-actions-panel">
      <div className="estimate-action-buttons">
        <button
          className="button"
          disabled={isPending}
          type="button"
          onClick={() => void submitAction("approve")}
        >
          {pendingAction === "approve" ? "Wird freigegeben..." : actionLabels.approve}
        </button>
        <button
          className="button light"
          disabled={isPending}
          type="button"
          onClick={() => {
            setActiveForm("question");
            setFeedback(null);
          }}
        >
          Rückfrage
        </button>
        <button
          className="button danger"
          disabled={isPending}
          type="button"
          onClick={() => {
            setActiveForm("decline");
            setFeedback(null);
          }}
        >
          Ablehnen
        </button>
      </div>

      {activeForm && (
        <form
          className="estimate-action-form"
          onSubmit={(event) => {
            event.preventDefault();
            void submitAction(activeForm, message);
          }}
        >
          <label htmlFor={`estimate-${activeForm}-message`}>
            {activeForm === "decline" ? "Nachricht zur Ablehnung" : "Ihre Rückfrage"}
          </label>
          <textarea
            id={`estimate-${activeForm}-message`}
            name="message"
            rows={4}
            value={message}
            placeholder={activeForm === "decline" ? "Optionaler Hinweis für uns" : "Ihre Frage zum Kostenvoranschlag"}
            onChange={(event) => setMessage(event.currentTarget.value)}
          />
          <div className="estimate-form-actions">
            <button className="button" disabled={isPending} type="submit">
              {pendingAction === activeForm ? "Wird gesendet..." : actionLabels[activeForm]}
            </button>
            <button
              className="button light"
              disabled={isPending}
              type="button"
              onClick={() => {
                setActiveForm(null);
                setMessage("");
              }}
            >
              Abbrechen
            </button>
          </div>
        </form>
      )}

      {feedback && (
        <p className={`estimate-feedback ${feedback.type === "error" ? "error" : "success"}`} role="status">
          {feedback.text}
        </p>
      )}
    </div>
  );
}