import os from "node:os";
import path from "node:path";
import { register } from "../engine/registry";
import { RuntimeError, type CapabilityHandler } from "../engine/types";
import { powershell, psString } from "./desktop";

function value(args: Record<string, unknown>, keys: string[], fallback = ""): string {
  for (const key of keys) {
    const current = args[key];
    if (current !== undefined && current !== null && current !== "") return String(current);
  }
  return fallback;
}

function required(args: Record<string, unknown>, keys: string[], label: string, nodeId: string, componentId: string): string {
  const result = value(args, keys).trim();
  if (!result) throw new RuntimeError("validation_error", `${label}为空`, { nodeId, componentId, recommendation: `请配置${label}` });
  return result;
}

function processPattern(raw: string): string {
  return path.basename(raw).replace(/\.exe$/i, "").replace(/\*/g, "*") || "*";
}

function selector(args: Record<string, unknown>): string {
  const raw = args.window_obj ?? args["窗口对象"] ?? args.match_title ?? args.select_title ?? args.target_window ?? args.title;
  if (typeof raw === "object" && raw !== null) {
    const object = raw as Record<string, unknown>;
    return String(object.title ?? object.windowTitle ?? object.pid ?? object.hwnd ?? "");
  }
  return String(raw ?? "");
}

const WINDOW_API = `Add-Type @'
using System;
using System.Runtime.InteropServices;
public static class RpaWindowApi {
  [StructLayout(LayoutKind.Sequential)] public struct RECT { public int Left; public int Top; public int Right; public int Bottom; }
  [DllImport("user32.dll")] public static extern bool GetWindowRect(IntPtr hWnd, out RECT rect);
  [DllImport("user32.dll")] public static extern bool ShowWindow(IntPtr hWnd, int command);
  [DllImport("user32.dll")] public static extern bool SetWindowPos(IntPtr hWnd, IntPtr after, int x, int y, int width, int height, uint flags);
}
'@`;

function findWindowScript(title: string): string {
  return `$p = Get-Process | Where-Object { $_.MainWindowHandle -ne 0 -and $_.MainWindowTitle -like ${psString(`*${title}*`)} } | Select-Object -First 1; if (-not $p) { throw '找不到窗口：${title.replace(/'/g, "''")}' }`;
}

register("System_GetEnv", (_ctx, node, args) => {
  const name = required(args, ["name"], "环境变量名称", node.id, node.componentId);
  return process.env[name] ?? "";
});

register("System_SetEnv", (_ctx, node, args) => {
  const name = required(args, ["name"], "环境变量名称", node.id, node.componentId);
  const content = value(args, ["value"]);
  process.env[name] = content;
  return content;
});

register("System_GetTempPath", () => os.tmpdir());
register("System_GetHomePath", () => os.homedir());
register("System_GetSystemPath", (_ctx, _node, args) => {
  const name = value(args, ["path_name"], "desktop").toLowerCase();
  const home = os.homedir();
  const paths: Record<string, string> = {
    desktop: path.join(home, "Desktop"), documents: path.join(home, "Documents"), document: path.join(home, "Documents"),
    downloads: path.join(home, "Downloads"), download: path.join(home, "Downloads"), pictures: path.join(home, "Pictures"),
    music: path.join(home, "Music"), videos: path.join(home, "Videos"), home,
    temp: os.tmpdir(), system: process.env.SystemRoot || "C:\\Windows", appdata: process.env.APPDATA || path.join(home, "AppData", "Roaming")
  };
  return paths[name] || value(args, ["path"]) || path.join(home, name);
});

const getPids: CapabilityHandler = async (_ctx, node, args) => {
  const pattern = processPattern(required(args, ["pattern", "p_name", "name"], "进程名称", node.id, node.componentId));
  const output = await powershell(`Get-Process | Where-Object { $_.ProcessName -like ${psString(pattern)} } | Select-Object -ExpandProperty Id`);
  return output.split(/\r?\n/).map((line) => line.trim()).filter(Boolean)
    .map(Number).filter((pid) => Number.isSafeInteger(pid) && pid > 0);
};
register("App_GetPids", getPids);
register("App_GetPid", async (ctx, node, args, component) => (await getPids(ctx, node, args, component) as number[])[0] ?? null);

register(["App_Kill", "App_KillV1"], async (_ctx, node, args) => {
  const mode = node.componentId === "App_Kill" ? "id" : value(args, ["close_type"], "id");
  if (mode === "id") {
    const rawPid = args.pid;
    const pid = typeof rawPid === "number" || typeof rawPid === "string" ? Number(rawPid) : NaN;
    if (!Number.isSafeInteger(pid) || pid <= 0) {
      throw new RuntimeError("validation_error", "进程 PID 必须是正整数", { nodeId: node.id, componentId: node.componentId });
    }
    if (pid === process.pid) throw new RuntimeError("validation_error", "拒绝关闭 RPA Studio 自身进程", { nodeId: node.id, componentId: node.componentId });
    await powershell(`Stop-Process -Id ${pid} -Force -ErrorAction Stop`);
    return pid;
  }
  if (mode !== "name") throw new RuntimeError("validation_error", "请选择按 PID 或按进程名称关闭", { nodeId: node.id, componentId: node.componentId });
  const pattern = processPattern(required(args, ["p_name", "pattern"], "进程名称", node.id, node.componentId));
  if (pattern === "*") throw new RuntimeError("validation_error", "关闭应用程序必须指定具体的进程名称", { nodeId: node.id, componentId: node.componentId });
  const allSessions = [true, 1, "1", "true", "True"].includes(args.kill_all as never);
  const session = allSessions ? "" : " -and $_.SessionId -eq [System.Diagnostics.Process]::GetCurrentProcess().SessionId";
  await powershell(`Get-Process | Where-Object { $_.ProcessName -like ${psString(pattern)} -and $_.Id -ne ${process.pid}${session} } | Stop-Process -Force -ErrorAction Stop`);
  return pattern;
});

register("Clipboard_GetTextV1", () => powershell("Get-Clipboard -Raw"));
register("Clipboard_SetTextV1", async (_ctx, _node, args) => {
  const content = value(args, ["text", "value"]);
  await powershell(`Set-Clipboard -Value ${psString(content)}`);
  return content;
});
register("Clipboard_ClearClipboard", async () => {
  await powershell("Set-Clipboard -Value $null");
  return true;
});

register("Window_GetWindowRect", async (_ctx, node, args) => {
  const title = required({ title: selector(args) }, ["title"], "窗口标题", node.id, node.componentId);
  const output = await powershell(`${WINDOW_API}; ${findWindowScript(title)}; $r = New-Object RpaWindowApi+RECT; [RpaWindowApi]::GetWindowRect($p.MainWindowHandle,[ref]$r) | Out-Null; @{x=$r.Left;y=$r.Top;width=$r.Right-$r.Left;height=$r.Bottom-$r.Top;title=$p.MainWindowTitle;pid=$p.Id} | ConvertTo-Json -Compress`);
  return JSON.parse(output);
});

register(["Window_SetWindowState", "Window_SetWindowState_v1"], async (_ctx, node, args) => {
  const title = required({ title: selector(args) }, ["title"], "窗口标题", node.id, node.componentId);
  const state = value(args, ["WindowType", "switchType"], "maximize").toLowerCase();
  const command = state.includes("min") ? 6 : state.includes("max") ? 3 : 9;
  await powershell(`${WINDOW_API}; ${findWindowScript(title)}; [RpaWindowApi]::ShowWindow($p.MainWindowHandle,${command}) | Out-Null`);
  return state;
});

register("Window_SizeWindow_v1", async (_ctx, node, args) => {
  const title = required({ title: selector(args) }, ["title"], "窗口标题", node.id, node.componentId);
  let size: unknown = args.window_size;
  if (typeof size === "string") {
    const source = size;
    try { size = JSON.parse(source); } catch { size = source.split(/[,，xX ]+/).map(Number); }
  }
  const [width, height] = Array.isArray(size) ? size.map(Number) : [0, 0];
  if (!(width > 0 && height > 0)) throw new RuntimeError("validation_error", "窗口尺寸无效", { nodeId: node.id, componentId: node.componentId });
  await powershell(`${WINDOW_API}; ${findWindowScript(title)}; $r = New-Object RpaWindowApi+RECT; [RpaWindowApi]::GetWindowRect($p.MainWindowHandle,[ref]$r) | Out-Null; [RpaWindowApi]::SetWindowPos($p.MainWindowHandle,[IntPtr]::Zero,$r.Left,$r.Top,${width},${height},4) | Out-Null`);
  return { width, height };
});