import { promises as fs } from "node:fs";
import path from "node:path";
import { getHandler, register } from "../engine/registry";
import { RuntimeError } from "../engine/types";
import { powershell, psString } from "./desktop";

interface WordHandle { path: string; }

function text(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 bool(value: unknown): boolean {
  return [true, 1, "1", "true", "True", "是", "开启"].includes(value as never);
}

function handlePath(args: Record<string, unknown>, nodeId: string, componentId: string): string {
  const raw = args.objWord ?? args.filePath ?? args.path;
  const candidate = raw && typeof raw === "object" ? (raw as Partial<WordHandle>).path : raw;
  const result = String(candidate || "").trim();
  if (!result || result === "word对象") throw new RuntimeError("validation_error", "Word文档路径为空", { nodeId, componentId });
  return path.resolve(result);
}

function script(filePath: string, body: string, save = true): string {
  return `$word=$null;$doc=$null;try{$word=New-Object -ComObject Word.Application;$word.Visible=$false;$word.DisplayAlerts=0;$doc=$word.Documents.Open(${psString(filePath)});${body};${save ? "$doc.Save();" : ""}}finally{if($doc -ne $null){try{$doc.Close()}catch{};try{[void][Runtime.InteropServices.Marshal]::ReleaseComObject($doc)}catch{}};if($word -ne $null){try{$word.Quit()}catch{};try{[void][Runtime.InteropServices.Marshal]::ReleaseComObject($word)}catch{}};[GC]::Collect();[GC]::WaitForPendingFinalizers()}`;
}

register("Word_New_V1", async (ctx, node, args, component) => {
  const base = getHandler("Word_New");
  if (!base) throw new RuntimeError("capability_not_implemented", "基础 Word 新建能力不可用", { nodeId: node.id, componentId: node.componentId });
  return base(ctx, node, args, component);
});

register("Word_GetPath", (_ctx, node, args) => handlePath(args, node.id, node.componentId));

register("Word_ReadAll", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  const encoded = await powershell(script(filePath, "[Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes($doc.Content.Text))", false));
  return Buffer.from(encoded.trim(), "base64").toString("utf8");
});

register("Word_Replace", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  const oldText = text(args, ["oldText"]);
  if (!oldText) throw new RuntimeError("validation_error", "原内容为空", { nodeId: node.id, componentId: node.componentId });
  const newText = text(args, ["newText"]);
  await powershell(script(filePath, `$find=$doc.Content.Find;[void]$find.Execute(${psString(oldText)},$false,$false,$false,$false,$false,$true,1,$false,${psString(newText)},2)`));
  return { path: filePath } satisfies WordHandle;
});

register("Word_Enter", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  await powershell(script(filePath, "$range=$doc.Content;$range.Collapse(0);$range.InsertParagraphAfter()"));
  return { path: filePath } satisfies WordHandle;
});

register("Word_InsertPage", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  await powershell(script(filePath, "$range=$doc.Content;$range.Collapse(0);$range.InsertBreak(7)"));
  return { path: filePath } satisfies WordHandle;
});

register("Word_SetFontName", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  await powershell(script(filePath, `$doc.Content.Font.Name=${psString(text(args, ["font"], "宋体"))}`));
  return { path: filePath } satisfies WordHandle;
});

register("Word_SetFontSize", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  const size = Number(text(args, ["fontSize"], "9"));
  if (!(size > 0)) throw new RuntimeError("validation_error", "字体大小无效", { nodeId: node.id, componentId: node.componentId });
  await powershell(script(filePath, `$doc.Content.Font.Size=${size}`));
  return { path: filePath } satisfies WordHandle;
});

register("Word_SetFontStyle", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  await powershell(script(filePath, `$doc.Content.Font.Bold=${bool(args.isBold) ? 1 : 0};$doc.Content.Font.Italic=${bool(args.isItalic) ? 1 : 0};$doc.Content.Font.Underline=${bool(args.isUnderline) ? 1 : 0}`));
  return { path: filePath } satisfies WordHandle;
});

register("Word_SetFontColor", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  const hex = text(args, ["fontColor"], "#000000").replace("#", "");
  if (!/^[0-9a-fA-F]{6}$/.test(hex)) throw new RuntimeError("validation_error", "字体颜色格式无效", { nodeId: node.id, componentId: node.componentId });
  const red = Number.parseInt(hex.slice(0, 2), 16); const green = Number.parseInt(hex.slice(2, 4), 16); const blue = Number.parseInt(hex.slice(4, 6), 16);
  await powershell(script(filePath, `$doc.Content.Font.Color=${red + green * 256 + blue * 65536}`));
  return { path: filePath } satisfies WordHandle;
});

register("Word_SetAlign", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  const align = text(args, ["align"], "left").toLowerCase();
  const value = align.includes("center") || align === "1" ? 1 : align.includes("right") || align === "2" ? 2 : align.includes("justify") || align === "3" ? 3 : 0;
  await powershell(script(filePath, `$doc.Content.ParagraphFormat.Alignment=${value}`));
  return { path: filePath } satisfies WordHandle;
});

register("Word_InsertPicture", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  const image = path.resolve(text(args, ["imageaddr"]));
  await fs.access(image);
  await powershell(script(filePath, `$range=$doc.Content;$range.Collapse(0);[void]$doc.InlineShapes.AddPicture(${psString(image)},$false,$true,$range)`));
  return { path: filePath } satisfies WordHandle;
});

register("Word_WriteTable", async (_ctx, node, args) => {
  const filePath = handlePath(args, node.id, node.componentId);
  let data: unknown = args.data;
  if (typeof data === "string") { try { data = JSON.parse(data); } catch { data = [[data]]; } }
  const rows = Array.isArray(data) ? data.map((row) => Array.isArray(row) ? row : [row]) : [[data]];
  const columns = Math.max(1, ...rows.map((row) => row.length));
  const encoded = Buffer.from(JSON.stringify(rows), "utf8").toString("base64");
  await powershell(script(filePath, `$json=[Text.Encoding]::UTF8.GetString([Convert]::FromBase64String(${psString(encoded)}));$data=$json|ConvertFrom-Json;$range=$doc.Content;$range.Collapse(0);$table=$doc.Tables.Add($range,${rows.length},${columns});for($r=0;$r-lt${rows.length};$r++){for($c=0;$c-lt${columns};$c++){if($c-lt$data[$r].Count){$table.Cell($r+1,$c+1).Range.Text=[string]$data[$r][$c]}}};$table.Borders.Enable=${bool(args.is_border ?? "1") ? 1 : 0}`));
  return { path: filePath } satisfies WordHandle;
});

register("Word_Close", (_ctx, node, args) => ({ path: handlePath(args, node.id, node.componentId), closed: true }));