var BOB_mod_gm      = require('gm').subClass({ imageMagick: true });
var BOB_mod_async   = require('async');
var BOB_mod_path    = require('path');
var BOB_mod_fs      = require('fs');
var BOB_mod_mkdirp  = require('mkdirp');

var BOB_cfg_config  = null;

var BOB_module = {};

BOB_module.getBoothList = function(pFrom, pCallback) {
  BOB_mod_fs.readdir(BOB_cfg_config.paths.final, function(pErr, pBoothList) {
    var boothList = pBoothList ? pBoothList.sort() : [];

    boothList = boothList.splice(boothList.indexOf(pFrom) + 1);

    pCallback(pErr, boothList);
  })
}

BOB_module.buildBooth = function(pBoothId, pCallback) {
  // Create output prebuild directory
  BOB_mod_mkdirp.sync(BOB_mod_path.join(BOB_cfg_config.paths.prebuilt, pBoothId));
  // Resize pictures
  BOB_mod_async.mapSeries(BOB_cfg_config.pictNames,
    function(pPictName, pCb) {
      var srcPict   = BOB_mod_path.join(BOB_cfg_config.paths.original, pBoothId, pPictName);
      var dstPict   = BOB_mod_path.join(BOB_cfg_config.paths.prebuilt, pBoothId, pPictName);

      console.log("Resizing "+dstPict);

      BOB_mod_gm(srcPict)
        .autoOrient()
        .gravity('Center')
        .resize(BOB_cfg_config.cropSize.width, BOB_cfg_config.cropSize.height, "^")
        .crop(BOB_cfg_config.cropSize.width, BOB_cfg_config.cropSize.height)
        // .modulate(100, 0)
        // .contrast(+2)
        .write(dstPict, function(pErr) {
          if(pErr) console.log("Failed to resize picture", pErr)
          pCb()
        })
    },
    function(pErr) {
      console.log("Building booth")
      switch(BOB_cfg_config.style) {
        default :
          BOB_generateBooth(pBoothId, 'default', pCallback);
      }
    })
}

function BOB_generateBooth(pBoothId, pType, pCallback) {
  var prebuiltPath  = BOB_mod_path.join(BOB_cfg_config.paths.prebuilt, pBoothId);
  var finalPict     = BOB_mod_path.join(BOB_cfg_config.paths.final, pBoothId+".jpg");
  var finalLdPict   = BOB_mod_path.join(BOB_cfg_config.paths.final_ld, pBoothId+".jpg");
  var outPict       = BOB_mod_gm(BOB_cfg_config.booths[pType].template);

  var printedDate   = new Date(parseInt(pBoothId));

  outPict.fill(BOB_cfg_config.background);
  outPict.drawRectangle(0, 0, BOB_cfg_config.booths[pType].resolution.width, BOB_cfg_config.booths[pType].resolution.height);

  outPict.draw('image Over 0,2080 1600,300 \''+BOB_cfg_config.footer+'\'');

  BOB_cfg_config.pictNames.forEach(function(pPictName, pIndex) {
    var cmdDraw = 'image Over';
    cmdDraw += ' '+BOB_cfg_config.booths[pType].layout[pIndex].x;
    cmdDraw += ','+BOB_cfg_config.booths[pType].layout[pIndex].y;
    cmdDraw += ' '+BOB_cfg_config.booths[pType].layout[pIndex].width;
    cmdDraw += ','+BOB_cfg_config.booths[pType].layout[pIndex].height;
    cmdDraw += ' \''+BOB_mod_path.join(prebuiltPath, pPictName)+'\'';

    console.log(cmdDraw);
    outPict.draw(cmdDraw);
  })  

  outPict.fill("#666");
  outPict.pointSize(20);
  outPict.draw('text 1250,2350 "'+printedDate.toUTCString()+'"');

  outPict.write(finalPict, function (pErr) {
    if( pErr ) {
      console.log("Write outfile")
      console.log(pErr)
      pCallback(pErr);
    } else {
      BOB_mod_gm(finalPict)
        .resize(600, null)
        .write(finalLdPict, function(pErr) {
          pCallback(pErr);
        })
    }
  });
}

module.exports = function(pConfig) {
  BOB_cfg_config = pConfig;
  BOB_updateConfig();
  return BOB_module;
}


function BOB_updateConfig() {
  BOB_mod_fs.readdir(BOB_cfg_config.paths.template, function(pErr, pFiles) {
    if( pErr ) {
      console.log("BOB_updateConfig", "Path:", BOB_cfg_config.paths.template, pErr);
    } else {
      BOB_mod_async.map(pFiles,
        function(pFile, pCb) {
          // Get name of template
          var boothName = pFile.split('.')[0];
          // Init layouts object for the template
          BOB_cfg_config.booths[boothName] = {
            name       : boothName,
            template   : BOB_mod_path.join(BOB_cfg_config.paths.template, pFile),
            resolution : { width : 0, height : 0 },
            layout     : []
          };
          // Get reslution of current template
          BOB_mod_gm(BOB_cfg_config.booths[boothName].template).size(function(pErr, pValue){
            if( pErr ) {
              console.log("[ERROR] Get template size", pErr);
            } else {
              BOB_cfg_config.booths[boothName].resolution = pValue;
              BOB_generatePictLayout(boothName);
            }
            pCb();
          })
        },
        function(pErr) {
        })
    }
  })
}

function BOB_generatePictLayout(pBoothName) {
  var index       = 0;
  var marginX     = 20;
  var marginY     = 20;

  var pictWidth   = ( BOB_cfg_config.booths[pBoothName].resolution.width  - 3 * marginX ) / 2;
  var pictHeight  = parseInt(pictWidth * BOB_cfg_config.cropSize.height / BOB_cfg_config.cropSize.width);

  BOB_cfg_config.pictNames.forEach(function(pPictName, pIndex) {
    BOB_cfg_config.booths[pBoothName].layout.push({
      x : marginX  + (marginX + pictWidth)  * ( pIndex % 2 ),
      y : marginY  + (marginY + pictHeight) * parseInt( pIndex / 2 ),
      width   : pictWidth,
      height  : pictHeight
    })
  })

  console.log("INIT DONE");
}