const route = require("express").Router();
const {exec} = require("child_process")
const { getUsers, removeUserScope, blockUser, unblockUser, addUserScope } = require("../arangodb");
const {verifyToken} = require("../checkToken");
const { mkdir, readFileSync, writeFileSync } = require("fs");

const getDeviceData = (dev)=>new Promise((res, rej)=>{
    exec(`blkid`, (err, out)=>{
         if(err){
             rej({error: 500, message:err})
         }else{
            const output = out.split("\n").map((line)=>{
                const lineitems = line.split(/[:"] {1,}/);
                const lineobj = {dev: lineitems.shift()}
                lineitems.forEach((item)=>{
                    const [key, val] = item.split("=");
                    // console.log(key)
                    lineobj[key]=val.replace(/"/g, "")
                })
                return lineobj
            })
            const found = output.find((item)=>item.dev==dev);
            if(found){
                res(found)
            }else{
                rej({error: 404, message:`${dev} not found in block device list`})
            }
         }
    })
})
route.get("/users", verifyToken, (req, res)=>{
    getUsers(["name", "blocked", "id", "scopes"]).then((users)=>{
        res.json(users.map(({name, blocked, id, scopes})=>({id, name, blocked, scopes})))
    })
})
route.post("/removescope", verifyToken, (req, res)=>{
    removeUserScope(req.body.uid, req.body.scope).then(()=>{
        res.end()
    }, ({error, message})=>{
        res.status(error).json(message)
    })
})
route.post("/addscope", verifyToken, (req, res)=>{
    addUserScope(req.body.uid, req.body.scope).then(()=>{
        res.end()
    }, ({error, message})=>{
        res.status(error).json(message)
    })
})
route.post("/unmount", verifyToken, (req, res)=>{
    const {mount} = req.body
    if(mount){
        exec(`umount ${mount} `, (err, out, serr)=>{
            if(err){
                res.status(500).json(`failed to unmount ${mount}`)
            }else{
                const fstab = readFileSync("/etc/fstab").toString().split("\n")
                writeFileSync("/etc/fstab", fstab.filter((line)=>!line.match(new RegExp(mount))).join("\n"))
                res.end()
            }
        })
    }else{
        res.status(400).json("no mount path specified for unmounting")
    }
})
route.post("/mount", verifyToken, (req, res)=>{
    const {dev, path} = req.body;
    // console.log(req.body)
    if(path.match(/^\/[^\/]*\/?$/)){
        res.status(403).json("can't mount drive to / or direct child of /")
    }else{
        exec(`mount ${dev} ${path}`, (err, out, sterr)=>{
            if(err){
                // console.log(err)
                res.status(500).json("mount failure")
            }else{
                // console.log(out, sterr)
                const fstab = readFileSync("/etc/fstab").toString().split("\n")
                // console.log(fstab)(
                getDeviceData(dev).then(({TYPE, UUID})=>{
                    const fstabstring = `/dev/disk/by-uuid/${UUID} ${path} ${TYPE} defaults 0 0`
                    fstab.splice(fstab.findIndex((line)=>!line.length), 0, fstabstring)
                    writeFileSync("/etc/fstab", fstab.join("\n"))
                    res.end()
                }, ({error, message})=>{
                    res.status(error).json(message)
                })
                
            }
        })
    }
})
route.post("/mkdir", verifyToken, (req, res)=>{
    const {path} = req.body;
    if(path.match(/^\/[^\/]*\/?$/)){
        res.status(403).json("can't make / or direct children of /")
    }else{
    mkdir(path, (err)=>{
        if(err){
            // console.log(err)
            res.status(500).json("can't create directory")
        }else{
            res.end()
        }
    })
}
})
route.post("/rmdir", verifyToken, (req, res)=>{
    const {path, force} = req.body;
    if(path.match(/^\/[^\/]*\/?$/)){
        res.status(403).json("can't delete / or direct children of /")
    }else{
    exec(`rm -r${force?"f":""} ${path}`, (err, stdout )=>{
        if(err){
            res.status(500).json("failed to remove folder")
        }else{
            res.end()
        }
    })
    }
})
route.post("/block", verifyToken, (req, res)=>{
    const {uid, blocked} = req.body;
    blockUser({id: uid, blocked}).then(()=>{
        res.end()
    }, ({error, message})=>{
        res.status(error).json(message)
    })  
})
route.post("/unblock", verifyToken, (req, res)=>{
    // console.log("unblockung user " + req.body.uid)
    unblockUser({id: req.body.uid}).then(()=>{
        res.end()
    }, ({error, message})=>{
        res.status(error).json(message)
    })
})
module.exports = route