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

interface UiaSelector {
  window?: string;
  name?: string;
  id?: string;
  type?: string;
  className?: string;
  index: number;
}

export function parseUiaSelector(raw: unknown): UiaSelector {
  let text = "";
  if (raw && typeof raw === "object") {
    const record = raw as Record<string, unknown>;
    if (typeof record.value === "string") text = record.value;
    else if (typeof record.selector === "string") text = record.selector;
    else if (record.commonProps && typeof record.commonProps === "object") {
      const common = record.commonProps as Record<string, unknown>;
      if (typeof common.uiSelector === "string") text = common.uiSelector;
    }
  } else if (raw !== undefined && raw !== null) {
    text = String(raw);
  }
  text = text.trim();
  if (!text) {
    throw new RuntimeError("validation_error", "桌面元素选择器为空", { recommendation: "使用 name=元素名称 或 id=AutomationId;window=窗口名称" });
  }
  if (text.startsWith("uia:")) text = text.slice(4);
  const selector: UiaSelector = { index: 1 };
  for (const part of text.split(";")) {
    const eq = part.indexOf("=");
    if (eq <= 0) continue;
    const key = part.slice(0, eq).trim().toLowerCase();
    const value = part.slice(eq + 1).trim();
    if (!value) continue;
    if (key === "window" || key === "win") selector.window = value;
    else if (key === "name" || key === "n") selector.name = value;
    else if (key === "id" || key === "automationid") selector.id = value;
    else if (key === "type" || key === "controltype") selector.type = value.charAt(0).toUpperCase() + value.slice(1).toLowerCase();
    else if (key === "class" || key === "classname") selector.className = value;
    else if (key === "index") {
      const n = Number(value);
      if (Number.isFinite(n) && n >= 1) selector.index = Math.floor(n);
    }
  }
  if (!selector.name && !selector.id && !selector.className && !selector.type) {
    throw new RuntimeError("validation_error", `桌面元素选择器缺少定位条件：${text}`, { recommendation: "至少提供 name= / id= / type= 之一" });
  }
  return selector;
}

const UIA_USING = "Add-Type -AssemblyName UIAutomationClient, UIAutomationTypes;";

const FIND_HELPER = `
function Find-RpaWindow([string]$winName) {
  $root = [System.Windows.Automation.AutomationElement]::RootElement
  if (-not $winName) { return $root }
  $cond = New-Object System.Windows.Automation.PropertyCondition([System.Windows.Automation.AutomationElement]::NameProperty, $winName)
  $win = $root.FindFirst([System.Windows.Automation.TreeScope]::Children, $cond)
  if (-not $win) { throw "window_not_found:$winName" }
  return $win
}
function Find-RpaElement($parent, [string]$name, [string]$id, [string]$type, [string]$className, [int]$index) {
  $conds = @()
  if ($name) { $conds += New-Object System.Windows.Automation.PropertyCondition([System.Windows.Automation.AutomationElement]::NameProperty, $name) }
  if ($id) { $conds += New-Object System.Windows.Automation.PropertyCondition([System.Windows.Automation.AutomationElement]::AutomationIdProperty, $id) }
  if ($className) { $conds += New-Object System.Windows.Automation.PropertyCondition([System.Windows.Automation.AutomationElement]::ClassNameProperty, $className) }
  if ($type) {
    try { $field = [System.Windows.Automation.ControlType].GetField($type); if ($field) { $conds += New-Object System.Windows.Automation.PropertyCondition([System.Windows.Automation.AutomationElement]::ControlTypeProperty, $field.GetValue($null)) } } catch {}
    if ($ct) { $conds += New-Object System.Windows.Automation.PropertyCondition([System.Windows.Automation.AutomationElement]::ControlTypeProperty, $ct) }
  }
  if ($conds.Count -eq 0) { throw "no_condition" }
  $final = if ($conds.Count -eq 1) { $conds[0] } else { New-Object System.Windows.Automation.AndCondition($conds) }
  $all = $parent.FindAll([System.Windows.Automation.TreeScope]::Descendants, $final)
  if ($all.Count -eq 0) { return $null }
  $pick = [Math]::Min([Math]::Max($index, 1), $all.Count)
  return $all[$pick - 1]
}
function Add-RpaUser32 {
  Add-Type -MemberDefinition '[DllImport("user32.dll")] public static extern bool SetCursorPos(int X, int Y); [DllImport("user32.dll")] public static extern void mouse_event(uint flags, uint dx, uint dy, uint data, UIntPtr extra); [DllImport("user32.dll")] public static extern bool SetForegroundWindow(IntPtr hWnd);' -Name RpaUser32Click -Namespace Win32Rpa | Out-Null
}
`;

interface UiaTarget {
  selector: UiaSelector;
  args: Record<string, unknown>;
  node: { id: string; componentId: string };
}

function target(args: Record<string, unknown>, node: { id: string; componentId: string }): UiaTarget {
  const raw = args.uiSelector ?? args.target ?? args.selector;
  return { selector: parseUiaSelector(raw), args, node };
}

function findScript(t: UiaTarget, timeoutMs: number, gapMs: number): string {
  const s = t.selector;
  return `${UIA_USING}
${FIND_HELPER}
$deadline = [DateTime]::UtcNow.AddMilliseconds(${Math.max(0, Math.round(timeoutMs))})
$found = $null
while ($null -eq $found) {
  try {
    $parent = Find-RpaWindow ${psString(s.window ?? "")}
    $found = Find-RpaElement $parent ${psString(s.name ?? "")} ${psString(s.id ?? "")} ${psString(s.type ?? "")} ${psString(s.className ?? "")} ${s.index}
  } catch {
    $err = $_.Exception.Message
    if ($err -like "window_not_found:*") { $found = $null }
  }
  if ($null -eq $found -and [DateTime]::UtcNow -ge $deadline) { break }
  if ($null -eq $found) { Start-Sleep -Milliseconds ${Math.max(50, Math.round(gapMs))} }
}
if ($null -eq $found) { Write-Output "JSON_NOT_FOUND" } else {
  $rect = $found.Current.BoundingRectangle
  $info = @{ found = $true; name = $found.Current.Name; id = $found.Current.AutomationId; type = $found.Current.ControlType.ProgrammaticName; enabled = $found.Current.IsEnabled; x = [int]$rect.X; y = [int]$rect.Y; w = [int]$rect.Width; h = [int]$rect.Height }
  Write-Output ($info | ConvertTo-Json -Compress)
}`;
}

async function findElement(t: UiaTarget, timeoutMs = 5000, gapMs = 200): Promise<Record<string, unknown> | null> {
  const out = await powershell(findScript(t, timeoutMs, gapMs), Math.max(30000, timeoutMs + 30000));
  const line = out.split(/\r?\n/).filter(Boolean).pop() || "";
  if (line.includes("JSON_NOT_FOUND")) return null;
  try {
    return JSON.parse(line);
  } catch {
    throw new RuntimeError("desktop_command_failed", `桌面元素查找输出异常：${out.slice(0, 200)}`, { nodeId: t.node.id, componentId: t.node.componentId });
  }
}

function clickScript(t: UiaTarget): string {
  const s = t.selector;
  const clickway = String(t.args.clickway ?? "0");
  const doubleClick = clickway === "1" || /double/i.test(clickway);
  return `${UIA_USING}
${FIND_HELPER}
$parent = Find-RpaWindow ${psString(s.window ?? "")}
$el = Find-RpaElement $parent ${psString(s.name ?? "")} ${psString(s.id ?? "")} ${psString(s.type ?? "")} ${psString(s.className ?? "")} ${s.index}
if ($null -eq $el) { Write-Output "JSON_NOT_FOUND"; exit 0 }
$rect = $el.Current.BoundingRectangle
$offscreen = $el.Current.IsOffscreen -or $rect.Width -le 0 -or $rect.Height -le 0
$method = "coordinate_click"
$ok = $false
if (-not $offscreen) {
  Add-RpaUser32
  $walker = [System.Windows.Automation.TreeWalker]::ControlViewWalker
  $ancestor = $el
  $hwnd = [IntPtr]::Zero
  while ($null -ne $ancestor) {
    $h = $ancestor.Current.NativeWindowHandle
    if ($h -ne 0) { $hwnd = [IntPtr]$h; break }
    $ancestor = $walker.GetParent($ancestor)
  }
  if ($hwnd -ne [IntPtr]::Zero) { [WinRpa.RpaUser32Click]::SetForegroundWindow($hwnd) | Out-Null; Start-Sleep -Milliseconds 250 }
  $x = [int]($rect.X + $rect.Width / 2)
  $y = [int]($rect.Y + $rect.Height / 2)
  [WinRpa.RpaUser32Click]::SetCursorPos($x, $y) | Out-Null
  Start-Sleep -Milliseconds 120
  [WinRpa.RpaUser32Click]::mouse_event(0x0002,0,0,0,[UIntPtr]::Zero)
  Start-Sleep -Milliseconds 40
  [WinRpa.RpaUser32Click]::mouse_event(0x0004,0,0,0,[UIntPtr]::Zero)
  if (${doubleClick}) {
    Start-Sleep -Milliseconds 60
    [WinRpa.RpaUser32Click]::mouse_event(0x0002,0,0,0,[UIntPtr]::Zero)
    Start-Sleep -Milliseconds 40
    [WinRpa.RpaUser32Click]::mouse_event(0x0004,0,0,0,[UIntPtr]::Zero)
  }
  $ok = $true
} else {
  $method = "invoke_pattern"
  foreach ($entry in @(@("Invoke", [System.Windows.Automation.InvokePattern]::Pattern), @("Toggle", [System.Windows.Automation.TogglePattern]::Pattern), @("Expand", [System.Windows.Automation.ExpandCollapsePattern]::Pattern), @("Select", [System.Windows.Automation.SelectionItemPattern]::Pattern))) {
    try {
      $p = $el.GetCurrentPattern($entry[1])
      switch ($entry[0]) {
        "Invoke" { $p.Invoke(); $ok = $true }
        "Toggle" { $p.Toggle(); $ok = $true }
        "Expand" { $p.Expand(); $ok = $true }
        "Select" { $p.Select(); $ok = $true }
      }
      if ($ok) { break }
    } catch {}
  }
}
$rect2 = $el.Current.BoundingRectangle
Write-Output (@{ clicked = $ok; method = $method; name = $el.Current.Name; x = [int]$rect2.X; y = [int]$rect2.Y; w = [int]$rect2.Width; h = [int]$rect2.Height } | ConvertTo-Json -Compress)`;
}
function setValueScript(t: UiaTarget, value: string): string {
  const s = t.selector;
  return `${UIA_USING}
${FIND_HELPER}
$parent = Find-RpaWindow ${psString(s.window ?? "")}
$el = Find-RpaElement $parent ${psString(s.name ?? "")} ${psString(s.id ?? "")} ${psString(s.type ?? "")} ${psString(s.className ?? "")} ${s.index}
if ($null -eq $el) { Write-Output "JSON_NOT_FOUND"; exit 0 }
$value = ${psString(value)}
$method = "value_pattern"
$ok = $false
try {
  $vp = $el.GetCurrentPattern([System.Windows.Automation.ValuePattern]::Pattern)
  $vp.SetValue($value)
  $ok = $true
} catch {
  $method = "clipboard_paste"
  Add-Type -AssemblyName System.Windows.Forms
  $saved = $null
  try { $saved = [System.Windows.Forms.Clipboard]::GetText() } catch {}
  try { $el.SetFocus() } catch {}
  Start-Sleep -Milliseconds 150
  try { [System.Windows.Forms.Clipboard]::SetText($value) } catch {}
  Start-Sleep -Milliseconds 80
  [System.Windows.Forms.SendKeys]::SendWait("^a")
  Start-Sleep -Milliseconds 60
  [System.Windows.Forms.SendKeys]::SendWait("^v")
  Start-Sleep -Milliseconds 300
  $ok = $true
  try {
    if ($saved) { [System.Windows.Forms.Clipboard]::SetText($saved) }
    elseif ($saved -ne $null) { [System.Windows.Forms.Clipboard]::Clear() }
  } catch {}
}
Write-Output (@{ set = $ok; method = $method; name = $el.Current.Name } | ConvertTo-Json -Compress)`;
}
function getValueScript(t: UiaTarget): string {
  const s = t.selector;
  return `${UIA_USING}
${FIND_HELPER}
$parent = Find-RpaWindow ${psString(s.window ?? "")}
$el = Find-RpaElement $parent ${psString(s.name ?? "")} ${psString(s.id ?? "")} ${psString(s.type ?? "")} ${psString(s.className ?? "")} ${s.index}
if ($null -eq $el) { Write-Output "JSON_NOT_FOUND"; exit 0 }
$value = $el.Current.Name
try { $vp = $el.GetCurrentPattern([System.Windows.Automation.ValuePattern]::Pattern); $value = $vp.Value } catch {}
Write-Output (@{ value = $value; name = $el.Current.Name } | ConvertTo-Json -Compress)`;
}

async function runScript(script: string, t: UiaTarget, timeoutMs = 60000): Promise<Record<string, unknown> | null> {
  const out = await powershell(script, timeoutMs);
  const line = out.split(/\r?\n/).filter(Boolean).pop() || "";
  if (line.includes("JSON_NOT_FOUND")) return null;
  try {
    return JSON.parse(line);
  } catch {
    throw new RuntimeError("desktop_command_failed", `桌面元素操作输出异常：${out.slice(0, 200)}`, { nodeId: t.node.id, componentId: t.node.componentId });
  }
}

function requireFound(result: Record<string, unknown> | null, t: UiaTarget, action: string): Record<string, unknown> {
  if (!result) {
    const s = t.selector;
    throw new RuntimeError("desktop_element_not_found", `桌面元素未找到（${action}）：${JSON.stringify({ window: s.window, name: s.name, id: s.id, type: s.type, className: s.className, index: s.index })}`, { nodeId: t.node.id, componentId: t.node.componentId });
  }
  return result;
}

const clickGround: CapabilityHandler = async (_ctx, node, args) => {
  const t = target(args, node);
  const result = await runScript(clickScript(t), t);
  return requireFound(result, t, "click");
};

const setValueGround: CapabilityHandler = async (_ctx, node, args) => {
  const t = target(args, node);
  const value = String(args.value ?? args.text ?? "");
  const result = await runScript(setValueScript(t, value), t);
  return requireFound(result, t, "setValue");
};

const existsGround: CapabilityHandler = async (_ctx, node, args) => {
  const t = target(args, node);
  const found = await findElement(t, 1000, 150);
  return found !== null;
};

const getValueGround: CapabilityHandler = async (_ctx, node, args) => {
  const t = target(args, node);
  const result = await runScript(getValueScript(t), t);
  return requireFound(result, t, "getValue").value ?? "";
};

const waitElementGround: CapabilityHandler = async (_ctx, node, args) => {
  const t = target(args, node);
  const timeout = Number(args.timeout ?? args.timeoutMs ?? 5000) || 5000;
  const gap = Number(args.time_gap ?? args.gapMs ?? 200) || 200;
  const found = await findElement(t, timeout, gap);
  return found !== null;
};

register("Element_ClickGround", clickGround);
register("Element_SetValueGround", setValueGround);
register("Element_ExistsGround", existsGround);
register("Element_GetValueGround", getValueGround);
register("Element_WaitElementGround", waitElementGround);