import { browserSession } from "../browser/session";
import { register } from "@rpa/core";
import { RuntimeError, type BrowserElementInfo, type BrowserLike, type RunContext } from "@rpa/core";

const GET_ELEMENT_IDS = ["Element_GetElement", "Element_GetElementV1", "Element_GetElementV2", "Element_GetElementNew"];
const GET_INFO_IDS = ["Element_GetElementInfo", "Element_GetElementInfo_V1"];
const PARENT_IDS = ["Element_Parent", "Element_Parent_V1", "Element_Parent_V2"];
const CHILDREN_IDS = ["Element_Children", "Element_ChildrenV1", "Element_Children_V1", "Element_Children_V2"];
const SIBLING_IDS = ["Element_Sibling", "Element_Sibling_V1", "Element_Sibling_V2"];
const SIMILAR_IDS = ["Element_SimilarElementList", "Element_SimilarElementList_V1", "Element_SimilarElementList_V2"];

export const BROWSER_COMMON_IDS = [
  ...GET_ELEMENT_IDS, ...GET_INFO_IDS, ...PARENT_IDS, ...CHILDREN_IDS, ...SIBLING_IDS,
  "Element_GetSelect", "Element_SetSelect", "Element_GetTableData", ...SIMILAR_IDS
] as const;

async function session(ctx: RunContext): Promise<BrowserLike> {
  if (!ctx.browser) ctx.browser = await browserSession();
  return ctx.browser;
}

function enabled(value: unknown): boolean {
  return value === true || value === 1 || String(value).toLowerCase() === "true" || String(value) === "1";
}

function assertUnifiedBrowser(args: Record<string, unknown>): void {
  if (enabled(args.designated_info)) {
    throw new RuntimeError("validation_error", "当前能力不支持指定其他网页或窗口对象", {
      recommendation: "关闭指定网页/窗口对象，使用当前运行浏览器"
    });
  }
  const browserType = String(args.browser_type ?? "").toLowerCase();
  if (browserType.includes("ie") || browserType.includes("sap") || browserType.includes("ground")) {
    throw new RuntimeError("validation_error", "当前能力仅支持标准浏览器 DOM");
  }
}

function hasSelector(value: unknown): boolean {
  if (typeof value === "string") return value.trim().length > 0;
  return Boolean(value && typeof value === "object" && Object.keys(value as object).length > 0);
}

function selectorOf(args: Record<string, unknown>): unknown {
  const position = String(args.element_position ?? "default").toLowerCase();
  if (position.includes("xpath") && hasSelector(args.xpath)) return `xpath:${String(args.xpath)}`;
  if (position.includes("css") && hasSelector(args.cssSelector)) return `css:${String(args.cssSelector)}`;
  for (const key of ["uiSelector", "default", "selector", "target"]) {
    if (hasSelector(args[key])) return args[key];
  }
  if (hasSelector(args.cssSelector)) return `css:${String(args.cssSelector)}`;
  if (hasSelector(args.xpath)) return `xpath:${String(args.xpath)}`;
  throw new RuntimeError("validation_error", "元素选择器为空", {
    recommendation: "填写标准 CSS/XPath 选择器或使用已有元素引用"
  });
}

function requireMethod<K extends keyof BrowserLike>(browser: BrowserLike, key: K): NonNullable<BrowserLike[K]> {
  const method = browser[key];
  if (typeof method !== "function") throw new RuntimeError("browser_error", `浏览器不支持 DOM 方法：${String(key)}`);
  return method.bind(browser) as NonNullable<BrowserLike[K]>;
}

function positiveInteger(value: unknown, fallback: number): number {
  const parsed = Math.trunc(Number(value));
  return Number.isFinite(parsed) && parsed > 0 ? parsed : fallback;
}

function optionalIndex(value: unknown): number | undefined {
  if (value === undefined || value === null || String(value).trim() === "") return undefined;
  return positiveInteger(value, 1);
}

function filterOf(args: Record<string, unknown>): string {
  return enabled(args.use) ? String(args.filter ?? "").trim() : "";
}

function listValue(value: unknown): string[] {
  if (Array.isArray(value)) return value.map(String).filter(Boolean);
  const text = String(value ?? "").trim();
  if (!text) return [];
  if (text.startsWith("[")) {
    try {
      const parsed = JSON.parse(text) as unknown;
      if (Array.isArray(parsed)) return parsed.map(String).filter(Boolean);
    } catch {
      // Fall back to comma-separated input.
    }
  }
  return text.split(",").map((item) => item.trim()).filter(Boolean);
}

async function completeUrl(browser: BrowserLike, value: string, shouldComplete: boolean): Promise<string> {
  if (!shouldComplete || !value) return value;
  try {
    return new URL(value, await browser.currentUrl()).toString();
  } catch {
    return value;
  }
}

async function infoResult(browser: BrowserLike, info: BrowserElementInfo, args: Record<string, unknown>): Promise<unknown> {
  const action = String(args.action ?? "gettext").toLowerCase();
  if (["gettext", "text", "1"].includes(action)) return info.text;
  if (["getvalue", "value", "2"].includes(action)) return info.elementValue;
  if (["getposition", "position", "region", "3"].includes(action)) return info.region;
  if (["gethref", "href", "link", "4"].includes(action)) return completeUrl(browser, info.href, enabled(args.attr_complate));
  if (["gethtml", "html", "code", "5"].includes(action)) return info.html;
  if (["getattribute", "attribute", "attr", "6"].includes(action)) {
    const name = String(args.attr_name ?? "").trim();
    if (!name) throw new RuntimeError("validation_error", "属性名为空");
    return completeUrl(browser, info.attributes[name] ?? "", enabled(args.attr_complate));
  }
  if (["all", "info", "0"].includes(action)) return info;
  throw new RuntimeError("validation_error", `不支持的元素信息类型：${action}`);
}

register(GET_ELEMENT_IDS, async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  const result = await requireMethod(await session(ctx), "getElement")(selectorOf(args));
  ctx.log(`已获取元素对象：${result.tag}`, "info", node.id);
  return result;
});

register(GET_INFO_IDS, async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  const browser = await session(ctx);
  const info = await requireMethod(browser, "getElementInfo")(selectorOf(args));
  const result = await infoResult(browser, info, args);
  ctx.log("已获取元素信息", "info", node.id);
  return result;
});

register(PARENT_IDS, async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  const result = await requireMethod(await session(ctx), "getParent")(
    selectorOf(args), positiveInteger(args.level, 1), filterOf(args)
  );
  ctx.log("已获取父元素", "info", node.id);
  return result;
});

register(CHILDREN_IDS, async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  const index = optionalIndex(args.num);
  const result = await requireMethod(await session(ctx), "getChildren")(selectorOf(args), index, filterOf(args));
  ctx.log(`已获取 ${result.length} 个子元素`, "info", node.id);
  return index === undefined ? result : result[0];
});

register(SIBLING_IDS, async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  const position = String(args.position ?? "2").toLowerCase();
  const direction = ["1", "previous", "prev", "up"].includes(position) ? "previous" : "next";
  const result = await requireMethod(await session(ctx), "getSibling")(selectorOf(args), direction, filterOf(args));
  ctx.log(`已获取${direction === "previous" ? "上一个" : "下一个"}兄弟元素`, "info", node.id);
  return result;
});

register("Element_GetSelect", async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  const state = await requireMethod(await session(ctx), "getSelectOptions")(selectorOf(args));
  const choose = String(args.choose ?? "1").toLowerCase();
  let result: unknown = state.values.length === 1 ? state.values[0] : state.values;
  if (["2", "text", "texts"].includes(choose)) result = state.texts.length === 1 ? state.texts[0] : state.texts;
  if (["3", "all", "options"].includes(choose)) result = state.options;
  ctx.log(`已读取下拉框，共 ${state.options.length} 个选项`, "info", node.id);
  return result;
});

register("Element_SetSelect", async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  const values = listValue(args.itemsToSelect ?? args.value);
  if (values.length === 0) throw new RuntimeError("validation_error", "下拉框选项为空");
  const choose = String(args.choose ?? "1");
  const mode = choose === "2" ? "add" : choose === "3" ? "remove" : "replace";
  const result = await requireMethod(await session(ctx), "setSelectOptions")(selectorOf(args), values, mode);
  ctx.log(`已设置下拉框：${result.texts.join(", ")}`, "info", node.id);
  return result;
});

register("Element_GetTableData", async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  if (enabled(args.sap_mode) || String(args.mode ?? "").toLowerCase().includes("sap")) {
    throw new RuntimeError("validation_error", "当前组件仅支持标准 HTML table，不支持 SAP 表格");
  }
  let rows = await requireMethod(await session(ctx), "getTableData")(selectorOf(args));
  const includeHeader = !["0", "false"].includes(String(args.operation ?? "1").toLowerCase());
  if (!includeHeader) rows = rows.slice(1);
  const range = String(args.tabelRange ?? "0");
  const row = positiveInteger(args.rowNo, 1) - 1;
  const column = positiveInteger(args.columnNo, 1) - 1;
  let result: unknown = rows;
  if (range === "1") result = rows[row] ?? [];
  else if (range === "2") result = rows.map((item) => item[column] ?? "");
  else if (range === "3") result = rows[row]?.[column] ?? "";
  ctx.log(`已读取 HTML 表格 ${rows.length} 行`, "info", node.id);
  return result;
});

register(SIMILAR_IDS, async (ctx, node, args) => {
  assertUnifiedBrowser(args);
  const browser = await session(ctx);
  const parent = enabled(args.relate_parent) ? args.parent_selector : undefined;
  if (enabled(args.relate_parent) && !hasSelector(parent)) {
    throw new RuntimeError("validation_error", "已启用关联父元素，但父元素选择器为空");
  }
  const references = await requireMethod(browser, "getSimilarElements")(selectorOf(args), {
    parent,
    start: positiveInteger(args.start_index, 1),
    end: Number.isFinite(Number(args.end_index)) ? Math.trunc(Number(args.end_index)) : -1,
    reverse: enabled(args.reverse)
  });
  const action = String(args.action ?? "selector").toLowerCase();
  let result: unknown = references;
  if (!["selector", "element", "elements"].includes(action)) {
    const infos = await Promise.all(references.map((reference) => requireMethod(browser, "getElementInfo")(reference)));
    if (["gettext", "text"].includes(action)) result = infos.map((info) => info.text);
    else if (["getvalue", "value"].includes(action)) result = infos.map((info) => info.elementValue);
    else if (["getattribute", "attribute", "attr"].includes(action)) {
      const name = String(args.attr_name ?? "").trim();
      if (!name) throw new RuntimeError("validation_error", "属性名为空");
      result = await Promise.all(
        infos.map((info) => completeUrl(browser, info.attributes[name] ?? "", enabled(args.attr_complate)))
      );
    } else {
      throw new RuntimeError("validation_error", `不支持的相似元素操作：${action}`);
    }
  }
  ctx.log(`已获取 ${references.length} 个相似元素`, "info", node.id);
  return result;
});