import { spawn } from 'node:child_process';
import { mkdir,writeFile,readFile,readdir } from 'node:fs/promises';
import { existsSync } from 'node:fs';
import path from 'node:path';
import { randomUUID } from 'node:crypto';
import type { Plugin } from 'vite';
export const GROUND_LINK_API='/__pierzainer/ground-link';
export function startGroundBat(bat:string,context:string,cwd:string){
 return spawn(process.env.ComSpec??'cmd.exe',['/d','/s','/c',`""${bat}""`],{cwd,windowsHide:true,windowsVerbatimArguments:true,env:{...process.env,PIERZAINER_GROUND_CONTEXT:context},stdio:'ignore'});
}

export async function findGroundDrawing(folder:string):Promise<string|undefined>{
 const matches:string[]=[];
 const walk=async(dir:string,depth:number)=>{for(const entry of await readdir(dir,{withFileTypes:true})){const file=path.join(dir,entry.name);if(entry.isDirectory()&&depth<2)await walk(file,depth+1);else if(entry.isFile()&&/\.(dwg|dxf)$/i.test(entry.name)&&/종평면|종평|종단|평종면/.test(entry.name))matches.push(file);}};
 if(folder)await walk(folder,0);const originals=matches.filter(file=>/\.dwg$/i.test(file));return originals.length===1?originals[0]:matches.length===1?matches[0]:undefined;
}
export function groundLinkPlugin(root:string):Plugin{
 const base=path.join(root,'pierzainer_ground'),cache=path.join(base,'data/cache/app-link'),stages=new Map<string,{excel:string;folder:string;name:string}>(),jobs=new Map<string,{output:string;logs:string;state:string}>();
 const handler=async(req:any,res:any,next:()=>void)=>{
  const pathname=new URL(req.url??'/','http://localhost').pathname;if(!pathname.startsWith(GROUND_LINK_API+'/'))return next();
  const reply=(code:number,value:unknown)=>{res.writeHead(code,{'Content-Type':'application/json; charset=utf-8','Cache-Control':'no-store'});res.end(JSON.stringify(value));};
  const host=req.headers.host??'',address=req.socket.remoteAddress??'';
  if(req.method!=='POST'||! /^(localhost|127\.0\.0\.1|\[::1\])(?::\d+)?$/i.test(host)||!['127.0.0.1','::1','::ffff:127.0.0.1'].includes(address)||req.headers['x-pierzainer-action']!=='ground-link'||req.headers.origin&&req.headers.origin!==`http://${host}`&&req.headers.origin!==`https://${host}`){reply(403,{error:'이 PC의 Pierzainer에서 실행하세요.'});return;}
  try{
   let raw='';for await(const part of req){raw+=part;if(raw.length>280*1024*1024)throw new Error('Excel 파일이 너무 큽니다(최대 20MB).');}const body=JSON.parse(raw||'{}'),action=pathname.slice(GROUND_LINK_API.length+1);
   if(action==='stage'){
    if(typeof body.name!=='string'||!body.name.toLowerCase().endsWith('.xlsx')||typeof body.base64!=='string'||!/^[A-Za-z0-9+/]*={0,2}$/.test(body.base64))throw new Error('교각 Excel(.xlsx) 파일을 선택하세요.');
    const bytes=Buffer.from(body.base64,'base64');if(bytes.length>20*1024*1024||bytes[0]!==80||bytes[1]!==75)throw new Error('유효한 xlsx 파일이 아닙니다.');
    const id=randomUUID(),dir=path.join(cache,id);await mkdir(dir,{recursive:true});const excel=path.join(dir,'piers.xlsx');await writeFile(excel,bytes);stages.set(id,{excel,name:body.name,folder:typeof body.folder==='string'?body.folder:''});reply(200,{id});return;
   }
   if(action==='prepare'){
    const stage=stages.get(body.stageId);const drawing=stage?.folder?await findGroundDrawing(stage.folder):undefined;reply(200,{drawing:drawing??'',excelSelected:!!stage,excelName:stage?.name??''});return;
   }
   if(action==='upload'){
    if(typeof body.name!=='string'||!/\.(dwg|dxf|xlsx)$/i.test(body.name)||typeof body.base64!=='string'||! /^[A-Za-z0-9+/]*={0,2}$/.test(body.base64))throw new Error('DWG/DXF 또는 Excel을 선택하세요.');
    const bytes=Buffer.from(body.base64,'base64');if(bytes.length>200*1024*1024)throw new Error('최대 200MB입니다.');const dir=path.join(cache,randomUUID());await mkdir(dir,{recursive:true});const file=path.join(dir,path.basename(body.name));await writeFile(file,bytes);reply(200,{file});return;
   }
   if(action==='launch'){
    const stage=stages.get(body.stageId),drawing=String(body.drawing??''),piers=String(body.excel??stage?.excel??'');
    const original=stage?.folder?await findGroundDrawing(stage.folder):undefined;
    const cached=(file:string)=>{const r=path.relative(cache,path.resolve(file));return !!r&&!r.startsWith('..')&&!path.isAbsolute(r);};
    if(!existsSync(drawing)||!/\.(dwg|dxf)$/i.test(drawing)||drawing!==original&&!cached(drawing))throw new Error('종평면도를 선택하세요.');
    if(!existsSync(piers)||!/\.xlsx$/i.test(piers)||!cached(piers))throw new Error('교각 Excel을 선택하세요.');
    const id=randomUUID(),output=path.join(base,'data/output',`app_${id}`),job={output,logs:'',state:'running'};jobs.set(id,job);
    const python=existsSync(path.join(base,'.venv/Scripts/python.exe'))?path.join(base,'.venv/Scripts/python.exe'):'python';
    const child=spawn(python,['-B','-u','-X','utf8','-m','pierzainer_ground.web_job',drawing,piers,output],{cwd:base,windowsHide:true,stdio:['ignore','pipe','pipe']});
    const append=(data:Buffer)=>{job.logs=(job.logs+data.toString('utf8')).slice(-200000);};child.stdout.on('data',append);child.stderr.on('data',append);
    child.once('error',error=>{job.state='error';job.logs+='\n'+error.message;});child.once('close',code=>{job.state=code===0?'done':'error';});reply(200,{id});return;
   }
   if(action==='result'){
    const job=jobs.get(body.id);if(!job)throw new Error('지반 생성 작업을 찾을 수 없습니다.');
    if(job.state!=='done'){reply(200,{ready:false,state:job.state,logs:job.logs});return;}
    for(const filename of ['ground_model_3d_with_maps.json','ground_model.json']){const file=path.join(job.output,filename);if(existsSync(file)){const text=await readFile(file,'utf8');JSON.parse(text);reply(200,{ready:true,filename,text,state:job.state,logs:job.logs});return;}}
    reply(200,{ready:false});return;
   }reply(404,{error:'지원하지 않는 지반 연동 요청입니다.'});
  }catch(error){reply(400,{error:(error as Error).message});}
 };
 return{name:'pierzainer-ground-link',configureServer(server){server.middlewares.use((req,res,next)=>void handler(req,res,next));},configurePreviewServer(server){server.middlewares.use((req,res,next)=>void handler(req,res,next));}};
}