var express = require('express');
var router = express.Router();
var fetch = require('node-fetch');
var dbFunctions = require('../../db/db').Functions;
var dbModels = require('../../db/db').Models;
const fs = require('fs');
const apiKey = fs.readFileSync("./secrets/api_key.txt", "utf8");

router.get('/', async function(req, res, next) {
  let userId = req.headers.email;
  if (!userId) {
    res.status(400);
    res.send("Missing user email");
    return;
  }
  // Find all ingredients of user
  let allIngredients = await dbFunctions.dbFindRecord(dbModels.Ingredient, {userId});
  if (!allIngredients || allIngredients.ingredients.length === 0) {
    res.status(200);
    res.send([]);
    return;
  }
  // Push into a list
  let ingredientListWithDate = [];
  allIngredients.ingredients.forEach(ingredient => {
    ingredientListWithDate.push([Math.min.apply((d) => d.getTime(), ingredient.date), ingredient.name]);
  });
  ingredientListWithDate.sort((e1, e2) => e1[0] > e2[0] ? 1: -1);

  let ingredientList = []
  for (let i = 0; i < Math.min(20, ingredientListWithDate.length); i++) {
    ingredientList.push(ingredientListWithDate[i][1]);
  }
  // Get recipes from api endpoint
  let endpoint = `https://api.spoonacular.com/recipes/findByIngredients?apiKey=${apiKey}&ingredients=${ingredientList}&number=5`;
  let apiResponse = await fetch(endpoint);
  if (apiResponse.status >= 300) {
    res.status(500);
    res.send("Cannot fetch recipes at this point");
  } else {
    let recipes = await apiResponse.json();
    res.status(200);
    res.send(recipes);
  }
});

router.post('/', async function(req, res, next) {
  let userId = req.body.userId;
  let recipeId = req.body.recipeId;
  if (!userId || !recipeId) {
    res.status(400);
    res.send("Request body parameters must not be empty");
    return;
  }
  let savedRecipe = await dbFunctions.dbFindRecord(dbModels.Recipe, {
    userId, 
    recipeId
  });
  if (savedRecipe) {
    savedRecipe.numTimes++;
  } else {
    let summaryEndpoint = `https://api.spoonacular.com/recipes/${recipeId}/summary?apiKey=${apiKey}`;
    let recipeSummary = "";
    let recipeName = "";
  
    let apiResponse = await fetch(summaryEndpoint);
    if (apiResponse.status >= 300) {
      res.status(500);
      res.send("Cannot save chosen recipe at this point");
      return;
    }
    let resJson = await apiResponse.json();
    recipeSummary = resJson.summary;
    recipeName = resJson.title;
    let recipeImage = req.body.recipeImage ? req.body.recipeImage : "https://visitors-centre.jrc.ec.europa.eu/sites/default/files/thumbnail/kmffq_additional-illo4video_2019_5_fishplate%5B1%5D.jpg"
    savedRecipe = new dbModels.Recipe({ 
      userId,
      recipeId,
      recipeSummary,
      recipeName,
      recipeImage,
      numTimes: 1,
      likes: 0
    });
  }
  await dbFunctions.dbSaveRecord(savedRecipe);

  let instrEndpoint = `https://api.spoonacular.com/recipes/${recipeId}/analyzedInstructions?apiKey=${apiKey}`;
  let apiResponse = await fetch(instrEndpoint);
  if (apiResponse.status >= 300) {
    res.status(500);
    res.send("Cannot fetch instructions at this point");
    return;
  }
  let resJson = await apiResponse.json();
  let response = {
    userId: savedRecipe.userId,
    recipeId: savedRecipe.recipeId,
    recipeName: savedRecipe.recipeName,
    recipeSummary: savedRecipe.recipeSummary,
    recipeImage: savedRecipe.recipeImage,
    numTimes: savedRecipe.numTimes,
    likes: savedRecipe.likes,
    instructions: resJson,
  }
  res.status(200);
  res.send(response);
});

module.exports = router;