import {
  delimiter,
  dots,
  hyphen,
  isPathLetter,
  numbersWithDots,
  pathLetters
} from '../modules/core/regex.js'
import Point from './Point.js'
import SVGArray from './SVGArray.js'
import parser from '../modules/core/parser.js'
import Box from './Box.js'

export function pathRegReplace (a, b, c, d) {
  return c + d.replace(dots, ' .')
}

function arrayToString (a) {
  for (var i = 0, il = a.length, s = ''; i < il; i++) {
    s += a[i][0]

    if (a[i][1] != null) {
      s += a[i][1]

      if (a[i][2] != null) {
        s += ' '
        s += a[i][2]

        if (a[i][3] != null) {
          s += ' '
          s += a[i][3]
          s += ' '
          s += a[i][4]

          if (a[i][5] != null) {
            s += ' '
            s += a[i][5]
            s += ' '
            s += a[i][6]

            if (a[i][7] != null) {
              s += ' '
              s += a[i][7]
            }
          }
        }
      }
    }
  }

  return s + ' '
}

const pathHandlers = {
  M: function (c, p, p0) {
    p.x = p0.x = c[0]
    p.y = p0.y = c[1]

    return [ 'M', p.x, p.y ]
  },
  L: function (c, p) {
    p.x = c[0]
    p.y = c[1]
    return [ 'L', c[0], c[1] ]
  },
  H: function (c, p) {
    p.x = c[0]
    return [ 'H', c[0] ]
  },
  V: function (c, p) {
    p.y = c[0]
    return [ 'V', c[0] ]
  },
  C: function (c, p) {
    p.x = c[4]
    p.y = c[5]
    return [ 'C', c[0], c[1], c[2], c[3], c[4], c[5] ]
  },
  S: function (c, p) {
    p.x = c[2]
    p.y = c[3]
    return [ 'S', c[0], c[1], c[2], c[3] ]
  },
  Q: function (c, p) {
    p.x = c[2]
    p.y = c[3]
    return [ 'Q', c[0], c[1], c[2], c[3] ]
  },
  T: function (c, p) {
    p.x = c[0]
    p.y = c[1]
    return [ 'T', c[0], c[1] ]
  },
  Z: function (c, p, p0) {
    p.x = p0.x
    p.y = p0.y
    return [ 'Z' ]
  },
  A: function (c, p) {
    p.x = c[5]
    p.y = c[6]
    return [ 'A', c[0], c[1], c[2], c[3], c[4], c[5], c[6] ]
  }
}

const mlhvqtcsaz = 'mlhvqtcsaz'.split('')

for (var i = 0, il = mlhvqtcsaz.length; i < il; ++i) {
  pathHandlers[mlhvqtcsaz[i]] = (function (i) {
    return function (c, p, p0) {
      if (i === 'H') c[0] = c[0] + p.x
      else if (i === 'V') c[0] = c[0] + p.y
      else if (i === 'A') {
        c[5] = c[5] + p.x
        c[6] = c[6] + p.y
      } else {
        for (var j = 0, jl = c.length; j < jl; ++j) {
          c[j] = c[j] + (j % 2 ? p.y : p.x)
        }
      }

      return pathHandlers[i](c, p, p0)
    }
  })(mlhvqtcsaz[i].toUpperCase())
}

export default class PathArray extends SVGArray {
  // Get bounding box of path
  bbox () {
    parser().path.setAttribute('d', this.toString())
    return new Box(parser.nodes.path.getBBox())
  }

  // Move path string
  move (x, y) {
    // get bounding box of current situation
    var box = this.bbox()

    // get relative offset
    x -= box.x
    y -= box.y

    if (!isNaN(x) && !isNaN(y)) {
      // move every point
      for (var l, i = this.length - 1; i >= 0; i--) {
        l = this[i][0]

        if (l === 'M' || l === 'L' || l === 'T') {
          this[i][1] += x
          this[i][2] += y
        } else if (l === 'H') {
          this[i][1] += x
        } else if (l === 'V') {
          this[i][1] += y
        } else if (l === 'C' || l === 'S' || l === 'Q') {
          this[i][1] += x
          this[i][2] += y
          this[i][3] += x
          this[i][4] += y

          if (l === 'C') {
            this[i][5] += x
            this[i][6] += y
          }
        } else if (l === 'A') {
          this[i][6] += x
          this[i][7] += y
        }
      }
    }

    return this
  }

  // Absolutize and parse path to array
  parse (array = [ 'M', 0, 0 ]) {
    // prepare for parsing
    var s
    var paramCnt = { M: 2, L: 2, H: 1, V: 1, C: 6, S: 4, Q: 4, T: 2, A: 7, Z: 0 }

    if (typeof array === 'string') {
      array = array
        .replace(numbersWithDots, pathRegReplace) // convert 45.123.123 to 45.123 .123
        .replace(pathLetters, ' $& ') // put some room between letters and numbers
        .replace(hyphen, '$1 -') // add space before hyphen
        .trim() // trim
        .split(delimiter) // split into array
    } else {
      // Flatten array
      array = Array.prototype.concat.apply([], array)
    }

    // array now is an array containing all parts of a path e.g. ['M', '0', '0', 'L', '30', '30' ...]
    var result = []
    var p = new Point()
    var p0 = new Point()
    var index = 0
    var len = array.length

    do {
      // Test if we have a path letter
      if (isPathLetter.test(array[index])) {
        s = array[index]
        ++index
        // If last letter was a move command and we got no new, it defaults to [L]ine
      } else if (s === 'M') {
        s = 'L'
      } else if (s === 'm') {
        s = 'l'
      }

      result.push(pathHandlers[s].call(null,
        array.slice(index, (index = index + paramCnt[s.toUpperCase()])).map(parseFloat),
        p, p0
      )
      )
    } while (len > index)

    return result
  }

  // Resize path string
  size (width, height) {
    // get bounding box of current situation
    var box = this.bbox()
    var i, l

    // If the box width or height is 0 then we ignore
    // transformations on the respective axis
    box.width = box.width === 0 ? 1 : box.width
    box.height = box.height === 0 ? 1 : box.height

    // recalculate position of all points according to new size
    for (i = this.length - 1; i >= 0; i--) {
      l = this[i][0]

      if (l === 'M' || l === 'L' || l === 'T') {
        this[i][1] = ((this[i][1] - box.x) * width) / box.width + box.x
        this[i][2] = ((this[i][2] - box.y) * height) / box.height + box.y
      } else if (l === 'H') {
        this[i][1] = ((this[i][1] - box.x) * width) / box.width + box.x
      } else if (l === 'V') {
        this[i][1] = ((this[i][1] - box.y) * height) / box.height + box.y
      } else if (l === 'C' || l === 'S' || l === 'Q') {
        this[i][1] = ((this[i][1] - box.x) * width) / box.width + box.x
        this[i][2] = ((this[i][2] - box.y) * height) / box.height + box.y
        this[i][3] = ((this[i][3] - box.x) * width) / box.width + box.x
        this[i][4] = ((this[i][4] - box.y) * height) / box.height + box.y

        if (l === 'C') {
          this[i][5] = ((this[i][5] - box.x) * width) / box.width + box.x
          this[i][6] = ((this[i][6] - box.y) * height) / box.height + box.y
        }
      } else if (l === 'A') {
        // resize radii
        this[i][1] = (this[i][1] * width) / box.width
        this[i][2] = (this[i][2] * height) / box.height

        // move position values
        this[i][6] = ((this[i][6] - box.x) * width) / box.width + box.x
        this[i][7] = ((this[i][7] - box.y) * height) / box.height + box.y
      }
    }

    return this
  }

  // Convert array to string
  toString () {
    return arrayToString(this)
  }

}