import { useState } from "react";
import { X, Copy, Loader2, Trash2 } from "lucide-react";
import { cn } from "@/lib/utils";
import { toast } from "sonner";
import { acceptShareCode, createShareCode, deleteShareCode, listShareCodes, queryShareCode, resolveShareDeviceModel } from "@/lib/luxsinApi";
import type { PeqEqUi } from "../constants";
import { resolveShareApiMessage } from "../shareMessages";
import { eqInterp } from "../utils";
import { PeqOverwriteConfirmDialog } from "./PeqOverwriteConfirmDialog";
import { PEQ_PRESET_NAME_MAX_LENGTH } from "../constants";
import { clampPeqPresetName, isPeqPresetNameTooLong } from "../peqPresetName";
import { PeqPresetNameLengthHint } from "./PeqPresetNameLengthHint";

type PeqItem = {
  name: string;
  brand?: string;
  model?: string;
  form?: string;
  filters?: any[] | string;
  autoPre?: number;
  preamp?: number;
  canDel?: number;
};

type PeqCardLabels = {
  share: string;
};

type ImportedEqData = {
  name: string;
  brand?: string;
  model?: string;
  target?: string;
  form?: string;
  filters?: unknown;
  preamp?: number;
  autoPre?: number;
};

export function ShareDialog({
  open,
  onClose,
  peqItems,
  headphoneIdx,
  eqUi,
  peqCardLabels,
  mac,
  device,
  isDemoMode,
  onImportEq,
}: {
  open: boolean;
  onClose: () => void;
  peqItems: PeqItem[];
  headphoneIdx: number;
  eqUi: PeqEqUi;
  peqCardLabels: PeqCardLabels;
  mac: string;
  device: string;
  isDemoMode: boolean;
  onImportEq: (data: ImportedEqData, shareCode: string) => void | Promise<void>;
}) {
  const [shareDialogTab, setShareDialogTab] = useState<"share" | "import" | "myShares">("share");
  const [shareSelectedIdx, setShareSelectedIdx] = useState<number>(headphoneIdx);
  const [shareCode, setShareCode] = useState<string | null>(null);
  const [shareGenerating, setShareGenerating] = useState(false);
  const [importCodeInputs, setImportCodeInputs] = useState<string[]>(["", "", "", "", ""]);
  const [importQuerying, setImportQuerying] = useState(false);
  const [importSaving, setImportSaving] = useState(false);
  const [importPresetName, setImportPresetName] = useState("");
  const [queriedShareCode, setQueriedShareCode] = useState("");
  const [importedEqData, setImportedEqData] = useState<ImportedEqData | null>(null);
  const [importedSourceModel, setImportedSourceModel] = useState<string | null>(null);
  const [shareCodeExpireAt, setShareCodeExpireAt] = useState<string | null>(null);
  const [mySharesList, setMySharesList] = useState<Array<{ share_code: string; expire_at: string; eq_data: Record<string, unknown> }>>([]);
  const [mySharesLoading, setMySharesLoading] = useState(false);
  const [deleteConfirmCode, setDeleteConfirmCode] = useState<string | null>(null);
  const [deletingShareCode, setDeletingShareCode] = useState<string | null>(null);

  const handleDeleteConfirm = () => {
    const code = deleteConfirmCode;
    if (!code || !mac || deletingShareCode) return;
    setDeleteConfirmCode(null);
    setDeletingShareCode(code);
    void (async () => {
      try {
        const res = await deleteShareCode(mac, code);
        if (res.code !== 200) {
          toast.error(resolveShareApiMessage("delete", res, eqUi));
          return;
        }
        setMySharesList((prev) => prev.filter((item) => item.share_code !== code));
        toast.success(eqUi.mySharesDeleteSuccess);
      } catch {
        toast.error(resolveShareApiMessage("delete", { code: 500 }, eqUi));
      } finally {
        setDeletingShareCode(null);
      }
    })();
  };

  const handleImportClick = async () => {
    if (importSaving || !importedEqData || !queriedShareCode) return;
    const nextName = importPresetName.trim();
    if (!nextName) return;
    if (isPeqPresetNameTooLong(nextName)) {
      toast.error(eqUi.addPresetNameTooLong);
      return;
    }

    setImportSaving(true);
    try {
      if (!isDemoMode && mac) {
        const shareDeviceModel = resolveShareDeviceModel(device);
        if (!shareDeviceModel) {
          toast.error(eqUi.shareInvalidParams);
          return;
        }
        const acceptRes = await acceptShareCode(mac, shareDeviceModel, queriedShareCode);
        if (acceptRes.code !== 200) {
          toast.error(resolveShareApiMessage("accept", acceptRes, eqUi));
          return;
        }
      }
      await onImportEq({ ...importedEqData, name: nextName }, queriedShareCode);
    } finally {
      setImportSaving(false);
    }
  };

  if (!open) return null;

  /* ── clipboard helper ── */
  const copyToClipboard = async (text: string) => {
    try {
      await navigator.clipboard.writeText(text);
      toast.success(eqUi.shareCopied);
    } catch {
      const ta = document.createElement("textarea");
      ta.value = text;
      ta.style.position = "fixed";
      ta.style.opacity = "0";
      document.body.appendChild(ta);
      ta.select();
      document.execCommand("copy");
      document.body.removeChild(ta);
      toast.success(eqUi.shareCopied);
    }
  };

  return (
    <>
    <div
      className="fixed inset-0 z-[120] flex items-start justify-center overflow-y-auto bg-black/65 px-4 pb-8 pt-[22vh]"
      onClick={(e) => {
        if (e.target !== e.currentTarget) return;
        if (importSaving || deleteConfirmCode !== null || deletingShareCode) return;
        onClose();
      }}
    >
      <div
        className="flex w-full max-w-[420px] flex-col rounded-[14px] p-5"
        style={{
          background: "linear-gradient(180deg, rgba(34,36,40,0.98) 0%, rgba(24,26,30,0.98) 100%)",
          border: "1px solid rgba(255,255,255,0.12)",
          boxShadow: "0 18px 48px rgba(0,0,0,0.55)",
        }}
        onClick={(e) => e.stopPropagation()}
      >
        {/* header */}
        <div className="mb-4 flex shrink-0 items-center gap-2">
          {/* tab bar */}
          <div
            className="grid min-w-0 flex-1 grid-cols-3 gap-1 rounded-[10px] p-1"
            style={{ background: "rgba(44,44,46,0.8)" }}
          >
            <button
              type="button"
              className={cn(
                "h-[34px] truncate rounded-[8px] px-2 text-center text-[13px] font-medium transition-colors",
                shareDialogTab === "share"
                  ? "bg-[#00FFF6] text-black font-semibold"
                  : "text-white/60 hover:text-white/80",
              )}
              onClick={() => setShareDialogTab("share")}
            >
              {peqCardLabels.share}
            </button>
            <button
              type="button"
              className={cn(
                "h-[34px] truncate rounded-[8px] px-2 text-center text-[13px] font-medium transition-colors",
                shareDialogTab === "import"
                  ? "bg-[#00FFF6] text-black font-semibold"
                  : "text-white/60 hover:text-white/80",
              )}
              onClick={() => setShareDialogTab("import")}
            >
              {eqUi.importTab}
            </button>
            <button
              type="button"
              className={cn(
                "h-[34px] truncate rounded-[8px] px-2 text-center text-[13px] font-medium transition-colors",
                shareDialogTab === "myShares"
                  ? "bg-[#00FFF6] text-black font-semibold"
                  : "text-white/60 hover:text-white/80",
              )}
              onClick={() => {
                setShareDialogTab("myShares");
                if (mySharesList.length === 0 && !mySharesLoading) {
                  void (async () => {
                    setMySharesLoading(true);
                    try {
                      const res = await listShareCodes(mac);
                      if (res.code !== 200) {
                        toast.error(resolveShareApiMessage("list", res, eqUi));
                        return;
                      }
                      setMySharesList(res.share_codes ?? []);
                    } catch {
                      toast.error(resolveShareApiMessage("list", { code: 500 }, eqUi));
                    } finally {
                      setMySharesLoading(false);
                    }
                  })();
                }
              }}
            >
              {eqUi.mySharesTab}
            </button>
          </div>
          <button
            type="button"
            className="shrink-0 rounded-full p-1.5 text-white/45 transition-colors hover:bg-white/10 hover:text-white/80 disabled:pointer-events-none disabled:opacity-40"
            disabled={importSaving}
            onClick={onClose}
          >
            <X size={20} />
          </button>
        </div>

        {/* ── Tab: Share EQ ── */}
        {shareDialogTab === "share" && (
          <>
            {/* hint */}
            <p className="mb-3 text-[13px] leading-relaxed text-white/45">{eqUi.shareSelectHint}</p>

            {/* EQ preset list */}
            <div
              className="mb-4 max-h-48 overflow-hidden overflow-y-auto rounded-[10px]"
              style={{
                background: "rgba(10,12,16,0.98)",
                border: "1px solid rgba(0,255,246,0.35)",
                boxShadow: "0 8px 20px rgba(0,0,0,0.45)",
              }}
            >
              {peqItems.length === 0 && (
                <div className="py-6 text-center text-[13px] text-white/30">—</div>
              )}
              {peqItems.map((item, idx) => {
                const active = idx === shareSelectedIdx;
                return (
                  <button
                    key={`${item.name}-${idx}`}
                    type="button"
                    className={`w-full px-3 py-2.5 text-left text-[13px] transition-colors truncate border-b border-white/[0.06] last:border-b-0 ${
                      active ? "text-black font-semibold" : "text-white/90 hover:bg-white/10"
                    }`}
                    style={active ? { background: "#00FFF6" } : undefined}
                    title={item.name}
                    onClick={() => setShareSelectedIdx(idx)}
                  >
                    {item.name}
                  </button>
                );
              })}
            </div>

            {/* confirm button */}
            <button
              type="button"
              disabled={shareGenerating || peqItems.length === 0}
              className={cn(
                "w-full rounded-full py-2.5 text-[15px] font-semibold text-black transition-all active:scale-[0.98]",
                shareGenerating || peqItems.length === 0
                  ? "bg-[#00FFF6]/40 cursor-not-allowed"
                  : "bg-[#00FFF6] hover:brightness-95",
              )}
              onClick={async () => {
                if (shareGenerating) return;
                setShareGenerating(true);
                setShareCode(null);
                setShareCodeExpireAt(null);
                try {
                  const selectedPeq = peqItems[shareSelectedIdx];
                  if (!selectedPeq) {
                    toast.error(eqUi.shareSelectHint);
                    return;
                  }
                  const eqData: Record<string, unknown> = {
                    name: selectedPeq.name,
                    brand: selectedPeq.brand ?? "",
                    model: selectedPeq.model ?? "",
                    form: selectedPeq.form ?? "",
                    filters: selectedPeq.filters ?? [],
                    autoPre: selectedPeq.autoPre ?? 0,
                    preamp: selectedPeq.preamp ?? 0,
                  };
                  const shareDeviceModel = resolveShareDeviceModel(device);
                  if (!shareDeviceModel) {
                    toast.error(eqUi.shareInvalidParams);
                    return;
                  }
                  const res = await createShareCode(mac, shareDeviceModel, eqData);
                  if (res.code !== 200) {
                    toast.error(resolveShareApiMessage("create", res, eqUi));
                    return;
                  }
                  setShareCode(res.share_code ?? "");
                  setShareCodeExpireAt(res.expire_at ?? null);
                } catch {
                  toast.error(resolveShareApiMessage("create", { code: 500 }, eqUi));
                } finally {
                  setShareGenerating(false);
                }
              }}
            >
              {shareGenerating ? (
                <span className="flex items-center justify-center gap-2">
                  <Loader2 size={16} className="animate-spin" />
                  {eqUi.shareGenerating}
                </span>
              ) : (
                eqUi.shareConfirm
              )}
            </button>

            {/* share code display */}
            {shareCode && (
              <div className="mt-5">
                <p className="mb-2 text-[12px] text-white/40 font-medium">{eqUi.shareCodeLabel}</p>
                <div className="flex items-center gap-2">
                  <div className="flex flex-1 gap-1.5 justify-center">
                    {shareCode.split("").map((ch, i) => (
                      <div
                        key={i}
                        className="w-11 h-12 rounded-[8px] flex items-center justify-center text-[18px] font-bold tracking-wider text-[#00FFF6]"
                        style={{
                          background: "rgba(0,255,246,0.08)",
                          border: "1px solid rgba(0,255,246,0.25)",
                        }}
                      >
                        {ch}
                      </div>
                    ))}
                  </div>
                  <button
                    type="button"
                    className="shrink-0 w-9 h-9 rounded-[8px] flex items-center justify-center text-[#00FFF6] active:scale-95 transition-transform"
                    style={{
                      background: "rgba(0,255,246,0.12)",
                      border: "1px solid rgba(0,255,246,0.25)",
                    }}
                    onClick={() => void copyToClipboard(shareCode)}
                  >
                    <Copy size={16} />
                  </button>
                </div>
                {/* expiration time */}
                {shareCodeExpireAt && (
                  <p className="mt-2 text-[11px] text-white/30">{eqUi.shareExpireAt}: {shareCodeExpireAt}</p>
                )}
              </div>
            )}
          </>
        )}

        {/* ── Tab: Import EQ ── */}
        {shareDialogTab === "import" && (
          <>
            {/* hint */}
            <p className="mb-3 text-[13px] leading-relaxed text-white/45">{eqUi.importCodeHint}</p>

            {/* 5 input boxes */}
            <div className="flex gap-2 justify-center mb-4">
              {importCodeInputs.map((ch, i) => (
                <input
                  key={i}
                  value={ch}
                  inputMode="text"
                  maxLength={1}
                  autoCapitalize="characters"
                  autoCorrect="off"
                  className="w-11 h-12 rounded-[8px] text-center text-[18px] font-bold tracking-wider text-[#00FFF6] bg-transparent outline-none uppercase"
                  style={{
                    background: "rgba(0,255,246,0.06)",
                    border: "1px solid rgba(0,255,246,0.25)",
                    caretColor: "#00FFF6",
                  }}
                  onChange={(e) => {
                    const val = e.target.value.replace(/[^a-zA-Z0-9]/g, "").slice(-1).toUpperCase();
                    const next = [...importCodeInputs];
                    next[i] = val;
                    setImportCodeInputs(next);
                    setImportedEqData(null);
                    setImportedSourceModel(null);
                    setImportPresetName("");
                    setQueriedShareCode("");
                    // auto-focus next box
                    if (val && i < 4) {
                      const el = e.target.nextElementSibling as HTMLInputElement | null;
                      el?.focus();
                    }
                  }}
                  onKeyDown={(e) => {
                    // backspace: clear current & focus previous
                    if (e.key === "Backspace" && !importCodeInputs[i] && i > 0) {
                      const next = [...importCodeInputs];
                      next[i - 1] = "";
                      setImportCodeInputs(next);
                      setImportedEqData(null);
                      setImportedSourceModel(null);
                      setImportPresetName("");
                      setQueriedShareCode("");
                      const prev = (e.target as HTMLElement).previousElementSibling as HTMLInputElement | null;
                      prev?.focus();
                    }
                  }}
                  onPaste={(e) => {
                    e.preventDefault();
                    const text = (e.clipboardData.getData("text") || "").replace(/[^a-zA-Z0-9]/g, "").toUpperCase().slice(0, 5);
                    if (!text) return;
                    const next = [...importCodeInputs];
                    for (let j = 0; j < 5; j++) {
                      next[j] = text[j] ?? "";
                    }
                    setImportCodeInputs(next);
                    setImportedEqData(null);
                    setImportedSourceModel(null);
                    setImportPresetName("");
                    setQueriedShareCode("");
                    // focus last filled or last box
                    const focusIdx = Math.min(text.length, 4);
                    const inputs = (e.target as HTMLElement).parentElement?.querySelectorAll("input");
                    (inputs?.[focusIdx] as HTMLInputElement | undefined)?.focus();
                  }}
                  ref={() => {
                    // stash ref for focus management if needed later
                  }}
                />
              ))}
            </div>

            {/* query button */}
            <button
              type="button"
              disabled={importQuerying || importCodeInputs.some((c) => !c)}
              className={cn(
                "w-full rounded-full py-2.5 text-[15px] font-semibold text-black transition-all active:scale-[0.98]",
                importQuerying || importCodeInputs.some((c) => !c)
                  ? "bg-[#00FFF6]/40 cursor-not-allowed"
                  : "bg-[#00FFF6] hover:brightness-95",
              )}
              onClick={async () => {
                if (importQuerying) return;
                const code = importCodeInputs.join("");
                setImportQuerying(true);
                setImportedEqData(null);
                setImportedSourceModel(null);
                setImportPresetName("");
                setQueriedShareCode("");
                try {
                  const res = await queryShareCode(code);
                  if (res.code !== 200) {
                    toast.error(resolveShareApiMessage("query", res, eqUi));
                    return;
                  }
                  const eq = res.eq_data;
                  if (!eq) {
                    toast.error(resolveShareApiMessage("query", { code: 0 }, eqUi));
                    return;
                  }
                  const fetchedName = (eq.name as string) || "";
                  setImportedEqData({
                    name: fetchedName,
                    brand: (eq.brand as string) || undefined,
                    model: (eq.model as string) || undefined,
                    target: (eq.target as string) || undefined,
                    form: (eq.form as string) || undefined,
                    filters: eq.filters,
                    preamp: eq.preamp as number | undefined,
                    autoPre: eq.autoPre as number | undefined,
                  });
                  setImportPresetName(clampPeqPresetName(fetchedName));
                  setImportedSourceModel(res.model ?? null);
                  setQueriedShareCode(code);
                } catch {
                  toast.error(resolveShareApiMessage("query", { code: 500 }, eqUi));
                } finally {
                  setImportQuerying(false);
                }
              }}
            >
              {importQuerying ? (
                <span className="flex items-center justify-center gap-2">
                  <Loader2 size={16} className="animate-spin" />
                  {eqUi.importQuerying}
                </span>
              ) : (
                eqUi.importQuery
              )}
            </button>

            {/* imported EQ result */}
            {importedEqData && (
              <div className="mt-4 rounded-[10px] p-3 space-y-3" style={{ background: "rgba(0,255,246,0.06)", border: "1px solid rgba(0,255,246,0.2)" }}>
                {importedSourceModel && (
                  <p className="text-[12px] text-white/60">
                    {eqUi.importSourceModel}: <span className="text-white/90">{importedSourceModel}</span>
                  </p>
                )}
                <div>
                  <p className="text-[12px] text-white/40 font-medium mb-1.5">
                    {eqUi.importEqName}
                    <span className="font-normal text-white/35">（{eqUi.importEqNameHint}）</span>
                  </p>
                  <input
                    value={importPresetName}
                    onChange={(e) => setImportPresetName(clampPeqPresetName(e.target.value))}
                    disabled={importSaving}
                    maxLength={PEQ_PRESET_NAME_MAX_LENGTH}
                    className="h-10 w-full rounded-[10px] border border-white/12 bg-[#15171b] px-3 text-[14px] text-white/90 outline-none placeholder:text-white/30 focus:border-[#00FFF6]/40 disabled:opacity-60"
                    placeholder={eqUi.importEqName}
                  />
                  <PeqPresetNameLengthHint value={importPresetName} />
                </div>
                <button
                  type="button"
                  disabled={importSaving || !importPresetName.trim()}
                  className={cn(
                    "w-full rounded-full py-2.5 text-[13px] font-semibold text-black transition-all active:scale-[0.98]",
                    importSaving || !importPresetName.trim()
                      ? "bg-[#00FFF6]/40 cursor-not-allowed"
                      : "bg-[#00FFF6] hover:brightness-95",
                  )}
                  onClick={() => void handleImportClick()}
                >
                  {importSaving ? (
                    <span className="flex items-center justify-center gap-1.5">
                      <Loader2 size={14} className="animate-spin" />
                      {eqUi.importSaving}
                    </span>
                  ) : (
                    eqUi.importButton
                  )}
                </button>
              </div>
            )}
          </>
        )}

        {/* ── Tab: My Shares ── */}
        {shareDialogTab === "myShares" && (
          <>
            {mySharesLoading && mySharesList.length === 0 ? (
              <div className="flex items-center justify-center gap-2 py-10 text-white/50">
                <Loader2 size={16} className="animate-spin" />
                <span className="text-[13px]">{eqUi.mySharesLoading}</span>
              </div>
            ) : mySharesList.length === 0 ? (
              <div className="py-10 text-center text-[13px] text-white/30">{eqUi.mySharesEmpty}</div>
            ) : (
              <div
                className="max-h-64 overflow-hidden overflow-y-auto rounded-[10px]"
                style={{
                  background: "rgba(10,12,16,0.98)",
                  border: "1px solid rgba(0,255,246,0.35)",
                  boxShadow: "0 8px 20px rgba(0,0,0,0.45)",
                }}
              >
                {mySharesList.map((item, idx) => (
                  <div
                    key={`${item.share_code}-${idx}`}
                    className="flex items-center gap-3 px-3 py-2.5 border-b border-white/[0.06] last:border-b-0"
                  >
                    {/* share code */}
                    <div
                      className="shrink-0 flex gap-0.5"
                      title={eqUi.mySharesCode}
                    >
                      {item.share_code.split("").map((ch: string, ci: number) => (
                        <span
                          key={ci}
                          className="w-[18px] h-[22px] rounded-[4px] flex items-center justify-center text-[11px] font-bold text-[#00FFF6]"
                          style={{ background: "rgba(0,255,246,0.1)", border: "1px solid rgba(0,255,246,0.2)" }}
                        >
                          {ch}
                        </span>
                      ))}
                    </div>
                    {/* EQ name + expiration */}
                    <div className="min-w-0 flex-1">
                      <div className="truncate text-[13px] text-white/85">
                        {(item.eq_data?.name as string) ?? "—"}
                      </div>
                      {item.expire_at && (
                        <p className="mt-0.5 truncate text-[11px] text-white/35">
                          {eqUi.shareExpireAt}: {item.expire_at}
                        </p>
                      )}
                    </div>
                    {/* copy + delete */}
                    <button
                      type="button"
                      disabled={!!deletingShareCode}
                      className="shrink-0 w-7 h-7 rounded-[6px] flex items-center justify-center text-[#00FFF6]/70 active:scale-95 transition-transform disabled:opacity-40"
                      style={{ background: "rgba(0,255,246,0.08)", border: "1px solid rgba(0,255,246,0.15)" }}
                      onClick={() => void copyToClipboard(item.share_code)}
                    >
                      <Copy size={13} />
                    </button>
                    <button
                      type="button"
                      disabled={!!deletingShareCode || !mac}
                      className="shrink-0 w-7 h-7 rounded-[6px] flex items-center justify-center text-red-400/80 active:scale-95 transition-transform disabled:opacity-40"
                      style={{ background: "rgba(239,68,68,0.08)", border: "1px solid rgba(239,68,68,0.2)" }}
                      title={eqUi.mySharesDeleteConfirmTitle}
                      onClick={() => {
                        if (deletingShareCode) return;
                        setDeleteConfirmCode(item.share_code);
                      }}
                    >
                      {deletingShareCode === item.share_code ? (
                        <Loader2 size={13} className="animate-spin" />
                      ) : (
                        <Trash2 size={13} />
                      )}
                    </button>
                  </div>
                ))}
              </div>
            )}
          </>
        )}
      </div>
    </div>

      <PeqOverwriteConfirmDialog
        open={deleteConfirmCode !== null}
        title={eqUi.mySharesDeleteConfirmTitle}
        description={
          deleteConfirmCode
            ? eqInterp(eqUi.mySharesDeleteConfirmDesc, { code: deleteConfirmCode })
            : ""
        }
        cancelLabel={eqUi.cancel}
        confirmLabel={eqUi.mySharesDeleteConfirmOk}
        onConfirm={handleDeleteConfirm}
        onCancel={() => setDeleteConfirmCode(null)}
      />
    </>
  );
}