const DIALOG_STYLE_ID = "sces-batch-name-dialog-style";

const activeDialogs = new WeakMap<
  Document,
  {
    input: HTMLInputElement;
    promise: Promise<string | null>;
  }
>();

export function promptForBatchName(document: Document): Promise<string | null> {
  const existingDialog = activeDialogs.get(document);
  if (existingDialog) {
    existingDialog.input.focus();
    existingDialog.input.select();
    return existingDialog.promise;
  }

  ensureDialogStyles(document);

  const dialogRoot = document.createElement("div");
  dialogRoot.dataset.pluginBatchNameDialog = "root";
  dialogRoot.setAttribute("role", "dialog");
  dialogRoot.setAttribute("aria-modal", "true");
  dialogRoot.setAttribute("aria-labelledby", "sces-batch-name-title");
  applyOverlayStyles(dialogRoot);

  const dialogPanel = document.createElement("div");
  applyPanelStyles(dialogPanel);

  const title = document.createElement("h2");
  title.id = "sces-batch-name-title";
  title.textContent = "提交批次";
  applyTitleStyles(title);

  const description = document.createElement("p");
  description.textContent = "请输入批次名称，便于后续在系统中识别和追踪。";
  applyDescriptionStyles(description);

  const input = document.createElement("input");
  input.type = "text";
  input.dataset.pluginBatchNameInput = "input";
  input.placeholder = "例如：618达人筛选第一批";
  input.maxLength = 60;
  applyInputStyles(input);

  const errorText = document.createElement("p");
  errorText.dataset.pluginBatchNameError = "text";
  applyErrorStyles(errorText);

  const buttonRow = document.createElement("div");
  applyButtonRowStyles(buttonRow);

  const cancelButton = document.createElement("button");
  cancelButton.type = "button";
  cancelButton.dataset.pluginBatchNameCancel = "button";
  cancelButton.textContent = "取消";
  applySecondaryButtonStyles(cancelButton);

  const confirmButton = document.createElement("button");
  confirmButton.type = "button";
  confirmButton.dataset.pluginBatchNameConfirm = "button";
  confirmButton.textContent = "确认提交";
  applyPrimaryButtonStyles(confirmButton);

  buttonRow.append(cancelButton, confirmButton);
  dialogPanel.append(title, description, input, errorText, buttonRow);
  dialogRoot.appendChild(dialogPanel);
  document.body.appendChild(dialogRoot);

  const dialogPromise = new Promise<string | null>((resolve) => {
    const closeDialog = (value: string | null) => {
      activeDialogs.delete(document);
      dialogRoot.remove();
      document.removeEventListener("keydown", handleDocumentKeydown, true);
      resolve(value);
    };

    const submitValue = () => {
      const value = input.value.trim();
      if (!value) {
        errorText.textContent = "请输入批次名称";
        input.setAttribute("aria-invalid", "true");
        input.focus();
        return;
      }

      closeDialog(value);
    };

    const handleDocumentKeydown = (event: KeyboardEvent) => {
      if (event.key === "Escape") {
        event.preventDefault();
        closeDialog(null);
        return;
      }

      if (event.key === "Enter") {
        event.preventDefault();
        submitValue();
      }
    };

    input.addEventListener("input", () => {
      if (!input.value.trim()) {
        return;
      }

      errorText.textContent = "";
      input.removeAttribute("aria-invalid");
    });
    cancelButton.addEventListener("click", () => {
      closeDialog(null);
    });
    confirmButton.addEventListener("click", () => {
      submitValue();
    });
    dialogRoot.addEventListener("click", (event) => {
      if (event.target === dialogRoot) {
        closeDialog(null);
      }
    });
    document.addEventListener("keydown", handleDocumentKeydown, true);
  });

  activeDialogs.set(document, {
    input,
    promise: dialogPromise
  });

  input.focus();

  return dialogPromise;
}

function ensureDialogStyles(document: Document): void {
  if (document.getElementById(DIALOG_STYLE_ID)) {
    return;
  }

  const style = document.createElement("style");
  style.id = DIALOG_STYLE_ID;
  style.textContent = `
    [data-plugin-batch-name-dialog="root"] {
      animation: sces-batch-name-fade-in 0.16s ease;
    }

    @keyframes sces-batch-name-fade-in {
      from {
        opacity: 0;
      }
      to {
        opacity: 1;
      }
    }
  `;
  document.head.appendChild(style);
}

function applyOverlayStyles(root: HTMLElement): void {
  root.style.position = "fixed";
  root.style.inset = "0";
  root.style.background = "rgba(15, 23, 42, 0.38)";
  root.style.display = "flex";
  root.style.alignItems = "center";
  root.style.justifyContent = "center";
  root.style.padding = "24px";
  root.style.zIndex = "2147483647";
}

function applyPanelStyles(panel: HTMLElement): void {
  panel.style.width = "min(420px, calc(100vw - 32px))";
  panel.style.background = "#fffaf9";
  panel.style.border = "1px solid rgba(127, 29, 45, 0.14)";
  panel.style.borderRadius = "18px";
  panel.style.boxShadow = "0 28px 70px rgba(15, 23, 42, 0.22)";
  panel.style.padding = "24px";
  panel.style.boxSizing = "border-box";
}

function applyTitleStyles(title: HTMLElement): void {
  title.style.margin = "0";
  title.style.color = "#4c0519";
  title.style.fontSize = "20px";
  title.style.fontWeight = "700";
  title.style.lineHeight = "28px";
}

function applyDescriptionStyles(description: HTMLElement): void {
  description.style.margin = "10px 0 0";
  description.style.color = "#64748b";
  description.style.fontSize = "13px";
  description.style.lineHeight = "20px";
}

function applyInputStyles(input: HTMLInputElement): void {
  input.style.width = "100%";
  input.style.height = "42px";
  input.style.marginTop = "18px";
  input.style.padding = "0 14px";
  input.style.boxSizing = "border-box";
  input.style.border = "1px solid #d8c1c6";
  input.style.borderRadius = "12px";
  input.style.background = "#ffffff";
  input.style.color = "#1f2937";
  input.style.fontSize = "14px";
  input.style.outline = "none";
}

function applyErrorStyles(errorText: HTMLElement): void {
  errorText.style.minHeight = "20px";
  errorText.style.margin = "8px 0 0";
  errorText.style.color = "#b91c1c";
  errorText.style.fontSize = "12px";
  errorText.style.lineHeight = "18px";
}

function applyButtonRowStyles(buttonRow: HTMLElement): void {
  buttonRow.style.display = "flex";
  buttonRow.style.justifyContent = "flex-end";
  buttonRow.style.gap = "10px";
  buttonRow.style.marginTop = "18px";
}

function applySecondaryButtonStyles(button: HTMLButtonElement): void {
  button.style.height = "36px";
  button.style.padding = "0 16px";
  button.style.border = "1px solid #d7dde6";
  button.style.borderRadius = "10px";
  button.style.background = "#ffffff";
  button.style.color = "#334155";
  button.style.fontWeight = "600";
  button.style.cursor = "pointer";
}

function applyPrimaryButtonStyles(button: HTMLButtonElement): void {
  button.style.height = "36px";
  button.style.padding = "0 16px";
  button.style.border = "1px solid #7f1d2d";
  button.style.borderRadius = "10px";
  button.style.background = "#7f1d2d";
  button.style.color = "#ffffff";
  button.style.fontWeight = "600";
  button.style.cursor = "pointer";
}