"use strict";

const express = require("express"),
  fs = require("fs"),
  url = require("url"),
  config = require("config"),
  moment = require("moment");

let photoDB;

require("../db/photos").then(function(db) {
  photoDB = db;
});

const router = express.Router();

/* Each photos has:

* locations
* people
* date
* tags
* photo info

*/

router.get("/memories/*", function(req, res/*, next*/) {
  let limit = parseInt(req.query.limit) || 50,
    id, cursor, index;

  if (req.query.next) {
    let parts = req.query.next.split("_");
    cursor = parts[0];
    id = parseInt(parts[1]);
  } else {
    cursor = "";
    id = -1;
  }

  if (id == -1) {
    index = "strftime('%m%d',taken)=strftime('%m%d',:date)";
  } else {
    index = "(strftime('%Y%m%d',taken)=strftime('%Y%m%d',:date) AND photos.id<"+id+ ")" + 
      " OR (strftime('%m%d',taken)=strftime('%m%d',:date) AND strftime('%Y',taken)!=strftime('%Y',:date))";
  }

  let date = new Date(decodeURI(req.url).replace(/\?.*$/, ""));
  let query = "SELECT photos.*,albums.path AS path FROM photos " +
    "INNER JOIN albums ON (albums.id=photos.albumId) " +
    "WHERE (photos.duplicate=0 AND photos.deleted=0 AND photos.scanned NOT NULL AND " + index + ") ORDER BY taken DESC,id DESC LIMIT " + (limit * 2 + 1);

//  console.log("Memories for " + date.toISOString().replace(/T.*/, ""));
//  console.log(query);

  return photoDB.sequelize.query(query, {
    replacements: {
      cursor: cursor,
      date: date
    },
    type: photoDB.Sequelize.QueryTypes.SELECT
  }).then(function(photos) {
    photos.forEach(function(photo) {
      for (var key in photo) {
        if (photo[key] instanceof Date) {
          photo[key] = moment(photo[key]);
        }
      }
    });

    if (cursor) {
      cursor = moment(cursor);
        photos = photos.filter(function(photo) {
        if (!cursor.isSame(photo.taken, "day")) {
          return true;
        }
        return photo.id < id;
      });
    }

    let more = photos.length > limit; /* We queried one extra item to see if there are more than LIMIT available */

    if (more) {
      photos.splice(limit);
    }

    let results = {
      items: photos
    };
    if (more) {
      results.more = true;
    }
    return res.status(200).json(results);
  }).catch(function(error) {
    console.error("Query failed: " + query);
    return Promise.reject(error);
  });
});

router.get("/*", function(req, res/*, next*/) {
  let limit = parseInt(req.query.limit) || 50,
    id, cursor, index;

  if (req.query.next) {
    let parts = req.query.next.split("_");
    cursor = parts[0];
    id = parseInt(parts[1]);
  } else {
    cursor = "";
    id = -1;
  }

  if (id == -1) {
    index = "";
  } else {
    index = "AND ((strftime('%m%d',taken)=strftime('%m%d',:cursor) AND photos.id<"+id+ ") OR DATE(taken)<DATE(:cursor))";
  }

  let path = decodeURI(req.url).replace(/\?.*$/, "").replace(/^\//, ""),
    query = "SELECT photos.*,albums.path AS path FROM photos " +
      "INNER JOIN albums ON (albums.id=photos.albumId AND albums.path LIKE :path) " +
      "WHERE (photos.duplicate=0 AND photos.scanned AND photos.deleted=0 NOT NULL " + index + ") ORDER BY taken DESC,id DESC LIMIT " + (limit * 2 + 1),
      replacements = {
        cursor: cursor,
        path: path + "%"
      };

//  console.log("Fetching from: " + JSON.stringify(replacements, null, 2) + "\nwith:\n" + query);
  
  return photoDB.sequelize.query(query, {
    replacements: replacements,
    type: photoDB.Sequelize.QueryTypes.SELECT
  }).then(function(photos) {
    photos.forEach(function(photo) {
      for (var key in photo) {
        if (photo[key] instanceof Date) {
          photo[key] = moment(photo[key]);
        }
      }
    });

    if (cursor) {
      cursor = moment(cursor);
        photos = photos.filter(function(photo) {
        if (!cursor.isSame(photo.taken, "day")) {
          return true;
        }
        return photo.id < id;
      });
    }

    let more = photos.length > limit; /* We queried one extra item to see if there are more than LIMIT available */

    if (more) {
      photos.splice(limit);
    }

    let results = {
      items: photos
    };
    if (more) {
      results.more = true;
    }
    return res.status(200).json(results);
  }).catch(function(error) {
    console.error("Query failed: " + query);
    return Promise.reject(error);
  });
});

module.exports = router;