"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/:date?", 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 = new Date(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',:cursor) AND photos.id<"+id+ ") OR " + 
    "(strftime('%m-%d',taken)=strftime('%m-%d',:cursor) AND strftime('%Y',taken)<strftime('%Y',:cursor)))";
  }

  let date = new Date("2016-" + req.params.date);
  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 strftime('%Y-%m-%d',taken) DESC,id DESC LIMIT " + (limit + 1);

//  console.log("Memories for " + date.toISOString().replace(/^2016-(.*)T.*$/, "$1"));
//  if (cursor) {
//    console.log("Cursor" + cursor.toISOString().replace(/T.*/, ""));
//  }


  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]);
        }
      }
    });

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

    let last;
    if (more) {
      photos.splice(limit);
      last = photos[photos.length - 1];
    }

    let results = {
      items: photos.sort(function(a, b) {
        return new Date(b.taken) - new Date(a.taken);
      })
    };

    if (more) {
      results.cursor = new Date(last.taken).toISOString().replace(/T.*/, "") + "_" + last.id;
      results.more = true;
    }
    return res.status(200).json(results);
  }).catch(function(error) {
    console.error("Query failed: " + query);
    return Promise.reject(error);
  });
});

router.get("/duplicates", function(req, res/*, next*/) {
  let replacements = {};

  return photoDB.sequelize.query(
    "SELECT filename,COUNT(*) AS count FROM photos WHERE photos.duplicate!=1 AND photos.deleted!=1 GROUP BY filename HAVING count > 1", {
    replacements: replacements,
    type: photoDB.Sequelize.QueryTypes.SELECT,
    raw: true
  }).then(function(duplicates) {
    let filenames = [];
    duplicates.forEach(function(duplicate) {
      filenames.push(duplicate.filename);
    });
    
    replacements.filenames = filenames;

    return photoDB.sequelize.query(
      "SELECT photos.*,albums.path AS path,photohashes.hash,(albums.path || photos.filename) AS filepath FROM photos " +
      "LEFT JOIN albums ON albums.id=photos.albumId " +
      "LEFT JOIN photohashes ON photohashes.photoId=photos.id " +
      "WHERE filename IN (:filenames) ORDER BY photos.filename", {
      replacements: replacements,
      type: photoDB.Sequelize.QueryTypes.SELECT,
      raw: true
    }).then(function(photos) {
      return res.status(200).json({
        items: photos
      });
    });
  }).catch(function(error) {
    return Promise.reject(error);
  });
});

router.get("/trash", function(req, res/*, next*/) {
  return photoDB.sequelize.query(
    "SELECT photos.*,albums.path AS path,(albums.path || photos.filename) AS filepath FROM photos " +
    "LEFT JOIN albums ON albums.id=photos.albumId " +
    "WHERE deleted=1 ORDER BY photos.filename", {
    type: photoDB.Sequelize.QueryTypes.SELECT,
    raw: true
  }).then(function(photos) {
    return res.status(200).json({
      items: photos
    });
  });
});

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('%Y-%m-%d',taken)=strftime('%Y-%m-%d',:cursor) AND photos.id<"+id+ ") OR " + 
      "(strftime('%m-%d',taken)=strftime('%m-%d',:cursor) AND strftime('%Y',taken)<strftime('%Y',: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.deleted=0 AND photos.scanned NOT NULL " + index + ") " +
      "ORDER BY strftime('%Y-%m-%d',taken) DESC,id DESC LIMIT " + (limit + 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]);
        }
      }
    });

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

    let last;
    if (more) {
      photos.splice(limit);
      last = photos[photos.length - 1];
    }

    let results = {
      items: photos.sort(function(a, b) {
        return new Date(b.taken) - new Date(a.taken);
      })
    };

    if (more) {
      results.cursor = new Date(last.taken).toISOString().replace(/T.*/, "") + "_" + last.id;
      results.more = true;
    }
    return res.status(200).json(results);
  }).catch(function(error) {
    console.error("Query failed: " + query);
    return Promise.reject(error);
  });
});


module.exports = router;