# frozen_string_literal: true

# The MIT License (MIT)
#
# Copyright (c) 2019 NUM Technology Ltd
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

module Sutil
  # Remove the first n characters from a string
  def self.tail(str, n = 1)
    return if n.negative?

    str&.slice(n, str.length)
  end

  # Keep the first n characters of a string
  def self.head(str, n = nil)
    return if str.nil?

    n = str.length - 1 if n.nil? # Strip last char by default

    str&.slice(0, n)
  end

  # Keep everything until char c
  def self.until(str, c)
    return str if c.nil? || c.empty?

    i = str.index(c)
    i ? str&.slice(0, i) : str
  end

  # Get everything after char c
  def self.after(str, c)
    return if str.nil?
    return str if c.nil?

    i = str.index(c)
    return '' if i.nil?

    str.slice(i + c.length, str.length)
  end

  # Get everything between ch1 and ch2
  # ch1 and ch2 must be different and ch1 must be before ch2 in the string
  # e.g. Sutil.between('func(p1,p2)', '(', ')') returns 'p1,p2'
  def self.between(str, ch1, ch2)
    return if str.nil?
    return str if ch1.nil? || ch2.nil? || ch1 == '' || ch2 == ''
    return str if str.length < 3

    first = str.index(ch1)
    second = str.rindex(ch2)
    if first > second
      tmp = first
      first = second
      second = tmp
    end
    return str if first == second

    str.slice(first + 1, second - first - 1)
  end

  # Remove the first and last chars from a string.
  def self.toptail(str)
    return str if str.nil?
    return '' if str.length < 3

    str&.slice(1, str.length - 2)
  end

  def self.replace(str, old, new)
    return str if old.nil? || new.nil? || old.empty? || old == new

    result = str
    loop do
      break unless result.include?(old)

      result = result.sub(old, new)
    end
    result
  end
end