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'use strict'
const objectHasProperty = require('./utils').objectHasProperty
const inspect = Symbol.for('nodejs.util.inspect.custom')

const TYPES = {
  VarChar (length) {
    return { type: TYPES.VarChar, length }
  },
  NVarChar (length) {
    return { type: TYPES.NVarChar, length }
  },
  Text () {
    return { type: TYPES.Text }
  },
  Int () {
    return { type: TYPES.Int }
  },
  BigInt () {
    return { type: TYPES.BigInt }
  },
  TinyInt () {
    return { type: TYPES.TinyInt }
  },
  SmallInt () {
    return { type: TYPES.SmallInt }
  },
  Bit () {
    return { type: TYPES.Bit }
  },
  Float () {
    return { type: TYPES.Float }
  },
  Numeric (precision, scale) {
    return { type: TYPES.Numeric, precision, scale }
  },
  Decimal (precision, scale) {
    return { type: TYPES.Decimal, precision, scale }
  },
  Real () {
    return { type: TYPES.Real }
  },
  Date () {
    return { type: TYPES.Date }
  },
  DateTime () {
    return { type: TYPES.DateTime }
  },
  DateTime2 (scale) {
    return { type: TYPES.DateTime2, scale }
  },
  DateTimeOffset (scale) {
    return { type: TYPES.DateTimeOffset, scale }
  },
  SmallDateTime () {
    return { type: TYPES.SmallDateTime }
  },
  Time (scale) {
    return { type: TYPES.Time, scale }
  },
  UniqueIdentifier () {
    return { type: TYPES.UniqueIdentifier }
  },
  SmallMoney () {
    return { type: TYPES.SmallMoney }
  },
  Money () {
    return { type: TYPES.Money }
  },
  Binary (length) {
    return { type: TYPES.Binary, length }
  },
  VarBinary (length) {
    return { type: TYPES.VarBinary, length }
  },
  Image () {
    return { type: TYPES.Image }
  },
  Xml () {
    return { type: TYPES.Xml }
  },
  Char (length) {
    return { type: TYPES.Char, length }
  },
  NChar (length) {
    return { type: TYPES.NChar, length }
  },
  NText () {
    return { type: TYPES.NText }
  },
  TVP (tvpType) {
    return { type: TYPES.TVP, tvpType }
  },
  UDT () {
    return { type: TYPES.UDT }
  },
  Geography () {
    return { type: TYPES.Geography }
  },
  Geometry () {
    return { type: TYPES.Geometry }
  },
  Variant () {
    return { type: TYPES.Variant }
  }
}

module.exports.TYPES = TYPES
module.exports.DECLARATIONS = {}

const zero = function (value, length) {
  if (length == null) length = 2

  value = String(value)
  if (value.length < length) {
    for (let i = 1; i <= length - value.length; i++) {
      value = `0${value}`
    }
  }
  return value
}

for (const key in TYPES) {
  if (objectHasProperty(TYPES, key)) {
    const value = TYPES[key]
    value.declaration = key.toLowerCase()
    module.exports.DECLARATIONS[value.declaration] = value;

    ((key, value) => {
      value[inspect] = () => `[sql.${key}]`
    })(key, value)
  }
}

module.exports.declare = (type, options) => {
  switch (type) {
    case TYPES.VarChar: case TYPES.VarBinary:
      return `${type.declaration} (${options.length > 8000 ? 'MAX' : (options.length == null ? 'MAX' : options.length)})`
    case TYPES.NVarChar:
      return `${type.declaration} (${options.length > 4000 ? 'MAX' : (options.length == null ? 'MAX' : options.length)})`
    case TYPES.Char: case TYPES.NChar: case TYPES.Binary:
      return `${type.declaration} (${options.length == null ? 1 : options.length})`
    case TYPES.Decimal: case TYPES.Numeric:
      return `${type.declaration} (${options.precision == null ? 18 : options.precision}, ${options.scale == null ? 0 : options.scale})`
    case TYPES.Time: case TYPES.DateTime2: case TYPES.DateTimeOffset:
      return `${type.declaration} (${options.scale == null ? 7 : options.scale})`
    case TYPES.TVP:
      return `${options.tvpType} readonly`
    default:
      return type.declaration
  }
}

module.exports.cast = (value, type, options) => {
  if (value == null) {
    return null
  }

  switch (typeof value) {
    case 'string':
      return `N'${value.replace(/'/g, '\'\'')}'`

    case 'number':
      return value

    case 'boolean':
      return value ? 1 : 0

    case 'object':
      if (value instanceof Date) {
        let ns = value.getUTCMilliseconds() / 1000
        if (value.nanosecondDelta != null) {
          ns += value.nanosecondDelta
        }
        const scale = options.scale == null ? 7 : options.scale

        if (scale > 0) {
          ns = String(ns).substr(1, scale + 1)
        } else {
          ns = ''
        }

        return `N'${value.getUTCFullYear()}-${zero(value.getUTCMonth() + 1)}-${zero(value.getUTCDate())} ${zero(value.getUTCHours())}:${zero(value.getUTCMinutes())}:${zero(value.getUTCSeconds())}${ns}'`
      } else if (Buffer.isBuffer(value)) {
        return `0x${value.toString('hex')}`
      }

      return null

    default:
      return null
  }
}