// OwlBoard - © Fred Boniface 2022 - Licensed under GPLv3 (or later)

// Please see the included LICENSE file statically served fonts are
// licensed separately, each folder contains a license file

// Version Number:
var version    = "0.0.1"
console.log(`Starting OwlBoard version ${version}`)

// Load & prepare modules:
const fs       = require('fs');
const ldb      = require('ldbs-json');
const express  = require('express');
const app      = express();

// Get API Keys:
try {
    var keys = JSON.parse(fs.readFileSync('/srv/keys/owlboard/keys.json', 'utf8'));
    console.log('API Keys loaded from /srv/keys/ownboard/keys.json');
  } catch (err) {
    var keys = 'ERR';
    console.error('Unable to obtain API Keys from file');
    console.error(err);
  };

// Get Settings:
try {
  var settings = JSON.parse(fs.readFileSync('./settings.json', 'utf8'));
  console.log("Settings loaded from .settings.json");
} catch (err) {
  console.warn('Unable to load settings, using defaults', err);
  var settings = {"webPort":8460,"listen":"localhost"};
};

// Create Web Service:
app.use(express.json()); //JSON Parsing for POST Requests
app.use(express.static('static')); //Serve static content from static

app.listen(settings.webPort, (error) =>{
  if(!error)
      console.log(`Server is running on http://${settings.listen}:${settings.webPort}`)
  else 
      console.log("Error occurred, server can't start", error);
  }
);


// Create/Connect to database:

// Routes:

app.get('/api', (req, res)=>{
  res.status(200);
  res.set('Content-Type', 'application/json');
  res.send(JSON.stringify({"OwlBoard_Status":"ready","OwlBoard_Version":version}));
});

app.post('/api/test', (req, res)=>{ //Check auth and return status
  const {test} = req.body;
  res.status(200);
  res.set('Content-Type', 'application/json');
  res.send(JSON.stringify({"test_outcome":"success","post_value":test}))
})

app.post('/api/arrdep', (req, res)=>{
  //Check Validity and Auth then return ArrDep JSON
  const {reqCode} = req.body;
  const {auth} = req.body;
  const permit = checkAuth(auth);
  const valid = checkValid(reqCode);
  res.set('Content-Type', 'application/json');
  if (permit == false) { //This should be the other way round - If Valid&Auth then return, elif not auth, elif invalid elif UnknownError
    res.status(401);
    res.send(JSON.stringify({"status":"fail","error":"Not Authorised"}));
  } else if (valid == false) {
    res.status(404);
    res.send(JSON.stringify({"status":"fail","error":"Location not Recognized"}));
  } 
  
})

app.post('/api/stations', (req, res)=>{
  //Return JSON of all available stations - No Auth Required
})

app.post('/api/send-issue', (req, res)=>{
  //Submit issue to Gitea (based on existing PHP Athena function)
})

// General Functions
function checkValid(input){
  // Check validity of the entered CRS/Tiploc against DB
}

function checkAuth(downstreamKey){
  // Check the downstream requester has authority to get depBoards
}