const path = require("path")
const fastify = require('fastify')({
   logger: false,
   // logger: true
})
const _ = require("lodash")
const fs = require("node:fs")
const dayjs = require("dayjs")

const log = require("./logger")
const db = require("./lib/db")
const libIlias = require("./lib/libIlias")
const settings = require("./settings")
const search = require("./lib/search.js")

/////////////////////////////////////////////////////////////////////////

// Compress
let compress = require('@fastify/compress')
// fastify.register(compress, { global: true })
fastify.register(compress)

// AUTH
fastify.addHook("onRequest", async (req, res) => {
   // custom logging
   log.info(`${req.method} ${req.url}`);
   // console.log(req.url)

   const token = req.query.token
   if (token !== settings.authtoken && !req.url.startsWith("/ui/")) {
      log.error("# AUTH ERROR #", token)
      await promiseDelay(500) // delay response to avoid denial of service attacks
      res.code(403)
      return res.send({status: "error", error: "access denied"})
   }
   else {
      log.debug("AUTH FOR ", req.url)
   }
})

/////// SEARCH ////////////////////////////////////////////////////////////////

const searchLib = require("./lib/search")
const {setStatus} = require("./lib/db")
searchLib.doIndex().catch(console.error)
fastify
   .get("/api/search/user", async function (req, res) {
      log.info(req.query)
      const search = req.query?.search
      if (!search) {
         return res.code(422).send({status: "error", msg: "no search"})
      }
      else {
         log.info(search)
         const data = await searchLib.search(search)
         return res.send(data)
      }
   })
   .post("/api/search/reindex", async function (req, res) {
      log.info("REINDEX ++++")
      const start = Date.now()
      await searchLib.doIndex().catch(console.error)
      return res.send({
         status: "ok",
         msg: `reindexed in ${Date.now() - start} ms`,
      })
   })

fastify
   /////// USER ////////////////////////////////////////////////////////////////
   .get('/api/user', async function (req, res) {
      const {offset, limit, search} = req.query
      const users = await db.getUsers(offset, limit, search)
      return res.send(users)
   })
   .get("/api/user/count", async function (req, res) {
      const count = await db.getUserCount()
      return res.send(count)
   })
   .get("/api/user/login/:login", async function (req, res) {
      const {login} = req.params
      const user = await db.getUserByLogin(login)
      if (user) {
         return res.send(user)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })
   .get("/api/user/userid/:userid", async function (req, res) {
      const {userid} = req.params
      if (!userid || isNaN(Number(userid))) {
         return res.code(500).send({status: "error", msg: "userid error"})
      }
      const user = await db.getUserByUserId(userid)
      if (user) {
         return res.send(user)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })
   .get("/api/user/teilnahmen/:userId", async function (req, res) {
      let userId = req.params.userId
      log.debug(`--------${userId}-----------`, typeof userId)
      if (!userId || isNaN(Number(userId))) {
         return res.code(500).send({status: "error", msg: "userId error"})
      }
      const tn = await db.getUserTeilnahmen(userId)
      if (tn) {
         return res.send(tn)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })

   .post("/api/user", async function (req, res) {
      const user = req.body
      const res2 = await libIlias.importIliasUser(user) // TODO import or update if already available
      return res.send(res2)
   })

   .delete("/api/user", async function (req, res) { // DELETE ALL users
      const res2 = await libIlias.deleteAllUsers()
      return res.send(res2)
   })
   .delete("/api/user/:usr_id", async function (req, res) {
      const {usr_id} = req.params
      if (!usr_id || isNaN(Number(usr_id))) {
         return res.code(500).send({status: "error", msg: "userId error"})
      }
      else {
         const res2 = await libIlias.deleteUser(usr_id)
         log.info(res2)
         return res.send(res2)
      }
   })

   /////// ref_id / obj_id  ////////////////////////////////////////////////////////////////

   .get("/api/ref_id/:ref_id", async function (req, res) {
      const {ref_id} = req.params
      const data = await db.getObjIdFromRefId(ref_id)
      if (data) {
         return res.send(data)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })
   .get("/api/obj_id/:obj_id", async function (req, res) {
      const {obj_id} = req.params
      let data = await db.getRefIdFromObjId(obj_id)
      if (data) {
         return res.send(data)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })

   /////// Kurs ////////////////////////////////////////////////////////////////

   .get("/api/kurs", async function (req, res) {
      let data = await db.getKurse()
      if (data) {
         return res.send(data)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })
   .get("/api/kurs/:refId", async function (req, res) {
      const {refId} = req.params
      let data = await db.getKurs(refId)
      if (data) {
         return res.send(data)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })
   .get("/api/kurs/items/:refId", async function (req, res) {
      const {refId} = req.params
      let data = await db.getKursItems2(refId)
      if (data) {
         return res.send(data)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })
   .get("/api/kurs/:refId/teilnehmer", async function (req, res) {
      const {refId} = req.params
      let data = await db.getKursTeilnehmer(refId)
      if (data) {
         return res.send(data)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })
   .get("/api/kurs/:refId/teilnehmerByRole", async function (req, res) {
      const {refId} = req.params
      const {obj_id} = await db.getObjIdFromRefId(refId)
      let data = await db.getKursTeilnehmerByRole(obj_id)
      return res.send(data)
   })
   .get("/api/kurs/:refId/roles", async function (req, res) {
      const {refId} = req.params
      let data = await db.getKursRoles(refId)
      return res.send(data)
   })
   .get("/api/kurs/:refId/teilnehmer/:userId", async function (req, res) {
      const {refId, userId} = req.params
      let data = await db.getSingleKursTeilnehmer(refId, userId)
      if (data) {
         return res.send(data)
      }
      else {
         return res.code(404).send({status: "error", msg: "not found"})
      }
   })
   // .get("/api/kurs/:refId/teilnehmer/count", async function (req, res) {
   //    const {refId} = req.params
   //    let data = await db.getKursTeilnehmerCount(refId)
   //    if (data) {
   //       return res.send(data)
   //    }
   //    else {
   //       return res.code(404).send({status: "error", msg: "not found"})
   //    }
   // })

   /** set passed and status for a kurs TN */
   .post("/api/kurs/:refId/status/:usrId", async function (req, res) {
      const {refId, usrId} = req.params
      const {passed, status} = req.body
      if (!refId || !usrId || _.isNil(passed) || _.isNil(status)) {
         throw {
            statusCode: 400,
            status: "error",
            msg: "argument error"
         }
      }
      try {
         const {obj_id: course_id} = await db.getObjIdFromRefId(refId)
         const data = await setStatus(course_id, usrId, passed, status)
         return res.send(data)
      } catch (ex) {
         console.error(ex)
         const msg = ex.msg ?? ex.message ?? ex.toString()
         if (ex.statusCode) {
            return res.code(ex.statusCode).send({status: "error", msg, statusCode: ex.statusCode})
         }
         return res.code(500).send({status: "error", msg})
      }
   })

   .delete("/api/kurs/:refId/teilnehmer/:usrId", async function (req, res) {
      const {refId, usrId} = req.params
      if (!refId || !usrId) throw {status: "error", msg: "refId and usrId requried"}
      try {
         const {obj_id: course_id} = await db.getObjIdFromRefId(refId)
         let data = await libIlias.abmelden(usrId, course_id)
         // let data = await libIlias.deleteTeilnahme(refId, usrId)
         if (!data) throw {statusCode: 404, message: "Teilnahme not found"}
         return res.send(data)
      } catch (ex) {
         console.error(ex)
         const msg = ex.msg ?? ex.message ?? ex.toString()
         if (ex.statusCode) {
            return res.code(ex.statusCode).send({status: "error", msg})
         }
         return res.code(500).send({status: "error", msg})
      }
   })


/////// STATIC / SPA ////////////////////////////////////////////////////////////////


fastify.register(require('@fastify/static'), {
   root: path.join(__dirname, 'vue/dist'),
   prefix: '/ui/', // optional: default '/'

   // constraints: { host: 'example.com' } // optional: default {}
})

const indexFile = fs.readFileSync(path.join(__dirname, "vue/dist", 'index.html'), 'utf8')
fastify.setNotFoundHandler(function (req, res) {
   log.error("!!! Not found")
   // res.sendFile("vue/dist/index.html")
   res.type("text/html").send(indexFile)
})


/////////////////////////////////////////////////////////////////////////

fastify.listen({port: settings.port}, function (err, address) {
   log.info("📡 -=> Listening on", address)
   if (err) {
      // fastify.log.error(err)
      log.error(err)
      process.exit(1)
   }
   // Server is now listening on ${address}
})

/////////////////////////////////////////////////////////////////////////

async function promiseDelay (ms) {
   return new Promise(resolve => setTimeout(resolve, ms))
}