require("dotenv").config();const express=require("express"),mongoose=require("mongoose"),cors=require("cors"),cron=require("node-cron"),rateLimit=require("express-rate-limit"),app=express(),PORT=process.env.PORT||3e3,HOST=process.env.HOST||"127.0.0.1";app.use(express.json()),app.use(cors());const limiter=rateLimit({windowMs:6e4,max:20});app.use(limiter),mongoose.connect(`mongodb://${HOST}/price-history`);const db=mongoose.connection;db.on("error",console.error.bind(console,"connection error:")),db.once("open",(()=>{console.log("Connected to MongoDB")})),app.get("/",((req,res)=>{res.send('\n        <title>RanchiMall Price History API</title>\n        <meta name="viewport" content="width=device-width, initial-scale=1.0">\n        <style>\n            body {\n                font-family: sans-serif;\n            }\n            h1{\n                font-size: 2rem;\n                margin-bottom: 2rem;\n            }\n            a{\n                color: inherit;\n            }\n            table {\n                border-collapse: collapse;\n            }\n            table, th, td {\n                border: 1px solid black;\n                padding: 0.5rem;\n            }\n            code {\n                display: inline-block;\n                background-color: #eee;\n                padding: 0.3rem;\n                border-radius: 0.2rem;\n                font: monospace;\n            }\n            @media (prefers-color-scheme: dark) {\n                body {\n                    background-color: #222;\n                    color: #eee;\n                }\n                table, th, td {\n                    border-color: #eee;\n                }\n                code {\n                    background-color: #333;\n                    color: #eee;\n                }\n            }\n\n        </style>\n        <section style="padding:4vw;">\n            <h1>\n                Welcome to the RanchiMall Price History API!\n            </h1>\n            <h3>\n                Available endpoints:\n            </h3>\n            <ul>\n                <li>\n                    <a href="/price-history">/price-history</a>\n                </li>\n            </ul>\n            <h3>\n                Query parameters:\n            </h3>\n            <table>\n                <thead>\n                    <tr>\n                        <th>Parameter</th>\n                        <th>Required</th>\n                        <th>Default</th>\n                        <th>format | values</th>\n                    </tr>\n                </thead>\n                <tbody>\n                    <tr>\n                        <td>from</td>\n                        <td>No</td>\n                        <td>None</td>\n                        <td>YYYY-MM-DD</td>\n                    </tr>\n                    <tr>\n                        <td>to</td>\n                        <td>No</td>\n                        <td>None</td>\n                        <td>YYYY-MM-DD</td>\n                    </tr>\n                    <tr>\n                        <td>on</td>\n                        <td>No</td>\n                        <td>None</td>\n                        <td>YYYY-MM-DD</td>\n                    </tr>\n                    <tr>\n                        <td>limit</td>\n                        <td>No</td>\n                        <td>100</td>\n                        <td>all | &lt;number&gt;</td>\n                    </tr>\n                    <tr>\n                        <td>asset</td>\n                        <td>No</td>\n                        <td>btc</td>\n                        <td>btc</td>\n                    </tr>\n                    <tr>\n                        <td>currency</td>\n                        <td>No</td>\n                        <td>All</td>\n                        <td>usd | inr</td>\n                    </tr>\n                </tbody>\n            </table>\n            <h3>\n                Example:\n            </h3>\n            <ul>\n                <li>\n                    <code>\n                        /price-history?from=2020-01-01&to=2020-01-31\n                    </code>\n                </li>\n            </ul>\n        </section>\n    ')}));const PriceHistory=require("./models/price-history");function loadHistoricToDb(){const now=parseInt(Date.now()/1e3);Promise.all([fetch(`https://query1.finance.yahoo.com/v7/finance/download/BTC-USD?period1=1410912000&period2=${now}&interval=1d&events=history&includeAdjustedClose=true`).then((res=>res.text())),fetch(`https://query1.finance.yahoo.com/v7/finance/download/BTC-INR?period1=1410912000&period2=${now}&interval=1d&events=history&includeAdjustedClose=true`).then((res=>res.text()))]).then((async([usd,inr])=>{const usdData=usd.split("\n").slice(1),inrData=inr.split("\n").slice(1),priceHistoryData=[];for(let i=0;i<usdData.length;i++){const[date,open,high,low,close,adjClose,volume]=usdData[i].split(","),[date2,open2,high2,low2,close2,adjClose2,volume2]=inrData[i].split(",");priceHistoryData.push({date:new Date(date).getTime(),asset:"btc",usd:parseFloat(parseFloat(close).toFixed(2)),inr:parseFloat(parseFloat(close2).toFixed(2))})}await PriceHistory.deleteMany({asset:"btc"}),await PriceHistory.insertMany(priceHistoryData)})).catch((err=>{console.log(err)}))}loadHistoricToDb(),app.get("/price-history",(async(req,res)=>{try{const{from:from,to:to,on:on,limit:limit=100,asset:asset="btc",currency:currency}=req.query,searchParams={asset:asset};from&&(searchParams.date={$gte:new Date(from).getTime()}),to&&(searchParams.date={...searchParams.date,$lte:new Date(to).getTime()}),on&&(searchParams.date={$eq:new Date(on).getTime()}),currency&&(searchParams[currency]={$exists:!0});const dataFormat={_id:0,__v:0,asset:0};"inr"===currency&&(dataFormat.usd=0),"usd"===currency&&(dataFormat.inr=0);const priceHistory=await PriceHistory.find(searchParams,dataFormat).sort({date:-1}).limit("all"===limit?0:parseInt(limit));res.json(priceHistory)}catch(err){console.log(err),res.status(500).json({error:err})}})),app.post("/price-history",(async(req,res)=>{try{const{dates:dates}=req.body;if(!dates)return res.status(400).json({error:"dates is required"});if(!Array.isArray(dates))return res.status(400).json({error:"dates must be an array"});const priceHistory=await PriceHistory.find({date:{$in:dates}},{_id:0,__v:0,asset:0});res.json(priceHistory)}catch(err){console.log(err),res.status(500).json({error:err})}})),app.listen(PORT,HOST,(()=>{console.log(`Listening on ${HOST}:${PORT}`)})),cron.schedule("0 */4 * * *",(async()=>{try{const[usd,inr]=await Promise.all([fetch("https://query1.finance.yahoo.com/v7/finance/download/BTC-USD").then((res=>res.text())),fetch("https://query1.finance.yahoo.com/v7/finance/download/BTC-INR").then((res=>res.text()))]),usdData=usd.split("\n").slice(1),inrData=inr.split("\n").slice(1);for(let i=0;i<usdData.length;i++){const[date,open,high,low,close,adjClose,volume]=usdData[i].split(","),[date2,open2,high2,low2,close2,adjClose2,volume2]=inrData[i].split(","),priceHistoryData={date:new Date(date).getTime(),asset:"btc",usd:parseFloat(parseFloat(close).toFixed(2)),inr:parseFloat(parseFloat(close2).toFixed(2))};await PriceHistory.findOneAndUpdate({date:priceHistoryData.date,asset:priceHistoryData.asset},priceHistoryData,{upsert:!0})}}catch(err){console.log(err)}}));