Java script help

Java script code help

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const express $=$require$("$express$")$;

const cors $=$require$("$cors$")$;

const multer $=$require$("$multer$")$;

const Joi $=$require$("$joi$")$;

const mongoose $=$require$("$mongoose$")$;

const app $=$express$()$;

app.use$($cors$())$;

app.use$($express$.$json$())$;

app.use$($express$.$static$("$public$"))$;

const storage $=$multer$.$diskStorage$(\{$

$$ destination: $($req$,$file$,$ cb$)=>\{$

$$ cb$($null$,"./$public$/$images$/")$;

$\},$

$$ filename: $($req$,$file$,$ cb$)=>\{$

$$ cb$($null$,$Date$.$now$()+"-"+$file$.$originalname$)$;

$\},$

$\})$;

const upload $=$multer$(\{$storage: storage $\})$;

const mongoURI $=$process$.$env.MONGODB$\_$URI $||"$mongodb$+$srv:$//$:@abc url$/$gearInventory$?$retryWrites$=$true&w$=$majority";

mongoose

$.$connect$($mongoURI$,\{$

$$ useNewUrlParser: true,

$$ useUnifiedTopology: true,

$\})$

$.$then$(()=>\{$

$$ console.log$("$MongoDB connected successfully"$)$;

$\})$

$.$catch$(($err$)=>\{$

$$ console.error$("$MongoDB connection error:", err$)$;

$\})$;

const gearSchema $=$new mongoose.Schema$(\{$

$$ name: $\{$type: String, required: true $\},$

$$ brand: $\{$type: String, required: true $\},$

$$ price: $\{$type: Number, required: true $\},$

$$ img$\_$name: $\{$type: String $\},$

$$ rating: $\{$type: Number $\},$

$$ features: $\{$type: $[$String$]\},$

$\})$;

const Gear $=$mongoose$.$model$("$Gear$",$gearSchema$)$;

const itemSchema $=$Joi$.$object$(\{$

$$ name: Joi.string$().$required$(),$

$$ brand: Joi.string$().$required$(),$

$$ price: Joi.number$().$required$(),$

$$ img$\_$name: Joi.string$().$optional$(),$

$$ rating: Joi.number$().$optional$(),$

$$ features: Joi.array$().$items$($Joi$.$string$()).$optional$(),$

$\})$;

app.get$("/",($req$,$res$)=>\{$

$$ res.sendFile$(\_\_$dirname $+"/$index$.$html$")$;

$\})$;

app.post$("/$api$/$upload$",$upload$.$single$("$gear$"),($req$,$res$)=>\{$

$$ if $(!$req.file$)\{$

$$ return res.status$(400).$send$("$No file uploaded."$)$;

$\}$

$$ console.log$("$File uploaded successfully:", req.file$)$;

$$ res.send$(\{$message: "File uploaded successfully!", file: req.file $\})$;

$\})$;

app.get$("/$api$/$gear$",$async $($req$,$res$)=>\{$

$$ try $\{$

$$ const items $=$await Gear.find$()$;

$$ res.json$($items$)$;

$\}$catch $($err$)\{$

$$ console.error$("$Error fetching gear items:", err$)$;

$$ res.status$(500).$json$(\{$success: false, message: "Failed to fetch gear items" $\})$;

$\}$

$\})$;

app.post$("/$api$/$gear$",$async $($req$,$res$)=>\{$

$$ const $\{$error $\}=$itemSchema$.$validate$($req$.$body$)$;

$$ if $($error$)\{$

$$ console.log$("$Validation error:", error.details$)$;

$$ return res.status$(400).$json$(\{$success: false, message: error.details$[0].$message $\})$;

$\}$

$$ try $\{$

$$ const newItem $=$new Gear$($req$.$body$)$;

$$ await newItem.save$()$;

$$ console.log$("$New gear item added:", newItem$)$;

$$ res.status$(201).$json$(\{$success: true, newItem $\})$;

$\}$catch $($err$)\{$

$$ console.error$("$Error saving gear item:", err$)$;

$$ res.status$(500).$json$(\{$success: false, message: "Failed to add gear item" $\})$;

$\}$

$\})$;

app.put$("/$api$/$gear$/$:id$",$async $($req$,$res$)=>\{$

$$ const $\{$error $\}=$itemSchema$.$validate$($req$.$body$)$;

$$ if $($error$)\{$

$$ console.log$("$Validation error:", error.details$)$;

$$ return res.status$(400).$json$(\{$success: false, message: error.details$[0].$message $\})$;

$\}$

$$ try $\{$

$$ const updatedItem $=$await Gear.findByIdAndUpdate$($req$.$params.id$,$req$.$body, $\{$

$$ new: true,

$\})$;

$$ if $(!$updatedItem$)\{$

$$ return res.status$(404).$json$(\{$success: false, message: "Item not found" $\})$;

$\}$

$$ console.log$("$Gear item updated:", updatedItem$)$;

$$ res.json$(\{$success: true, updatedItem $\})$;

$\}$catch $($err$)\{$

$$ console.error$("$Error updating gear item:", err$)$;

$$ res.status$(500).$json$(\{$success: false, message: "Failed to update gear item" $\})$;

$\}$

$\})$;

app.delete$("/$api$/$gear$/$:id$",$async $($req$,$res$)=>\{$

$$ try $\{$

$$ const deletedItem $=$await Gear.findByIdAndDelete$($req$.$params.id$)$;

$$ if $(!$deletedItem$)\{$

$$ return res.status$(404).$json$(\{$success: false, message: "Item not found" $\})$;

$\}$

$$ console.log$("$Gear item deleted:", deletedItem$)$;

$$ res.json$(\{$success: true, message: "Item deleted successfully" $\})$;

$\}$catch $($err$)\{$

$$ console.error$("$Error deleting gear item:", err$)$;

$$ res.status$(500).$json$(\{$success: false, message: "Failed to delete gear item" $\})$;

$\}$

$\})$;

const PORT $=$process$.$env.PORT $||4000$;

app.listen$($PORT$,()=>\{$

$$ console.log$(`$Listening on port $$\{$PORT$\}...`)$;

$\})$;