import { PlusIcon } from "lucide-react";
import { useState, type FormEvent } from "react";
import { cn } from "../../utils/classname";
import StateSection from "./sections/state";
import CommandSection from "./sections/command";
import { useCreateTopic } from "./hooks/mutations";
import { getMerchant } from "../../utils/storage";
import { ENV } from "../../constants/env";

export default function TopicsFeature() {
  const [tab, setTab] = useState("state");
  const [isOpen, setIsOpen] = useState(false);
  const [form, setForm] = useState<TopicPayload>({
    topic: "",
    type: "state-reply",
  });
  const [error, setError] = useState("");
  const createTopic = useCreateTopic();
  const merchant = getMerchant();
  const expectedCredential = ENV.credential?.trim();
  const hasCredential = Boolean(merchant?.credential?.trim());
  const isCredentialMatch =
    Boolean(expectedCredential) &&
    merchant?.credential?.trim() === expectedCredential;
  const isMerchantSetup =
    Boolean(merchant?.merchantName?.trim()) &&
    Boolean(merchant?.tower?.trim()) &&
    Boolean(merchant?.floor?.trim()) &&
    Boolean(merchant?.unit?.trim());
  const isReady = isMerchantSetup && hasCredential && isCredentialMatch;

  const handleOpen = () => {
    setError("");
    setForm({
      topic: "",
      type: tab === "state" ? "state-reply" : "commands",
    });
    setIsOpen(true);
  };

  const handleClose = () => {
    if (createTopic.isPending) return;
    setIsOpen(false);
  };

  const handleSubmit = (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();
    const topic = form.topic.trim();
    if (!topic) {
      setError("Topic wajib diisi.");
      return;
    }

    createTopic.mutate(
      { topic, type: form.type },
      {
        onSuccess: () => {
          setIsOpen(false);
          setForm({
            topic: "",
            type: tab === "state" ? "state-reply" : "commands",
          });
        },
        onError: () => {
          setError("Gagal menambah topic.");
        },
      },
    );
  };

  return (
    <div className="flex flex-col gap-4">
      {!isReady && (
        <div className="mx-4 rounded-md border border-amber-200 bg-amber-50 px-4 py-3 text-sm text-amber-700">
          {!isMerchantSetup && (
            <span>
              Silakan setup merchant terlebih dahulu di halaman Settings sebelum
              mengakses Topics.
            </span>
          )}
          {isMerchantSetup && !hasCredential && (
            <span>
              Silakan isi credential terlebih dahulu di halaman Settings sebelum
              mengakses Topics.
            </span>
          )}
          {isMerchantSetup && hasCredential && !isCredentialMatch && (
            <span>Credential tidak sesuai.</span>
          )}
        </div>
      )}
      <div className="p-4 flex justify-end">
        <button
          onClick={handleOpen}
          className="shrink-0 px-4 py-2 rounded-md flex items-center justify-center transition-all bg-orange-500 text-white disabled:cursor-not-allowed disabled:opacity-60"
          disabled={!isReady}
        >
          <PlusIcon />
          Tambah Topic
        </button>
      </div>
      <div className="flex justify-between">
        <button
          onClick={() => setTab("state")}
          className={cn(
            "w-full text-center p-x2 py-4 border-b-2 border-transparent",
            tab === "state" && "border-amber-500",
          )}
        >
          state-reply
        </button>
        <button
          onClick={() => setTab("command")}
          className={cn(
            "w-full text-center p-x2 py-4 border-b-2 border-transparent",
            tab === "command" && "border-amber-500",
          )}
        >
          commands
        </button>
      </div>
      {tab === "state" && <StateSection />}
      {tab === "command" && <CommandSection />}
      {isOpen && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/40 p-4">
          <div className="w-full max-w-md rounded-md bg-white p-4 shadow-lg">
            <div className="flex items-center justify-between">
              <h2 className="text-lg font-semibold">Tambah Topic</h2>
              <button
                onClick={handleClose}
                className="text-sm text-neutral-500"
                type="button"
              >
                Tutup
              </button>
            </div>
            <form onSubmit={handleSubmit} className="mt-4 flex flex-col gap-3">
              <label className="text-sm font-medium text-neutral-700">
                Topic
                <input
                  className="mt-1 w-full rounded-md border border-neutral-300 px-3 py-2 text-sm outline-none focus:border-amber-500"
                  placeholder="Masukkan topic"
                  value={form.topic}
                  onChange={(event) =>
                    setForm((prev) => ({ ...prev, topic: event.target.value }))
                  }
                />
              </label>
              <label className="text-sm font-medium text-neutral-700">
                Type
                <select
                  className="mt-1 w-full rounded-md border border-neutral-300 px-3 py-2 text-sm outline-none focus:border-amber-500"
                  value={form.type}
                  onChange={(event) =>
                    setForm((prev) => ({
                      ...prev,
                      type: event.target.value as TopicPayload["type"],
                    }))
                  }
                >
                  <option value="state-reply">state-reply</option>
                  <option value="commands">commands</option>
                </select>
              </label>
              {error && (
                <p className="text-sm text-red-500">{error}</p>
              )}
              <div className="mt-2 flex justify-end gap-2">
                <button
                  type="button"
                  onClick={handleClose}
                  className="rounded-md border border-neutral-300 px-4 py-2 text-sm"
                  disabled={createTopic.isPending}
                >
                  Batal
                </button>
                <button
                  type="submit"
                  className="rounded-md bg-amber-500 px-4 py-2 text-sm text-white disabled:cursor-not-allowed disabled:opacity-70"
                  disabled={createTopic.isPending}
                >
                  {createTopic.isPending ? "Menyimpan..." : "Simpan"}
                </button>
              </div>
            </form>
          </div>
        </div>
      )}
    </div>
  );
}