# frozen_string_literal: true
require 'gir_ffi_test_helper'

require 'gir_ffi/in_pointer'

describe GirFFI::InPointer do
  describe '.from_array' do
    it 'returns nil when passed nil' do
      result = GirFFI::InPointer.from_array :gint32, nil
      assert_nil result
    end

    it 'handles type tag :GType' do
      GirFFI::InPointer.from_array :GType, [2]
    end

    it 'handles enum types' do
      e = Module.new do
        extend GirFFI::EnumBase
        self::Enum = FFI::Enum.new [:foo, :bar, :baz], :qux
      end
      ptr = GirFFI::InPointer.from_array e, [:bar, :foo, :baz]
      ptr.read_array_of_int32(3).must_equal [1, 0, 2]
    end

    it 'handles struct types' do
      e = Class.new(GirFFI::StructBase) do
        self::Struct = Class.new(GirFFI::Struct) do
          layout :foo, :int32, :bar, :int32
        end
      end
      struct = e::Struct.allocate
      struct[:foo] = 42
      struct[:bar] = 24
      ptr = GirFFI::InPointer.from_array e, [struct]
      ptr.wont_equal struct.to_ptr
      new_struct = e::Struct.new ptr
      new_struct[:foo].must_equal 42
      new_struct[:bar].must_equal 24
    end

    it 'handles typed pointers' do
      p1 = GirFFI::InPointer.from :gint32, 42
      p2 = GirFFI::InPointer.from :gint32, 24

      ptr = GirFFI::InPointer.from_array [:pointer, :gint32], [p1, p2]

      ptr.read_array_of_pointer(2).must_equal [p1, p2]
    end

    it 'handles pointer casting' do
      ptr = GirFFI::InPointer.from_array [:pointer, :gint32], [42, 24]

      ptr.read_array_of_pointer(2).map(&:address).must_equal [42, 24]
    end
  end

  describe 'an instance created with .from_array :gint32' do
    before do
      @result = GirFFI::InPointer.from_array :gint32, [24, 13]
    end

    it 'holds a pointer to the correct input values' do
      assert_equal 24, @result.get_int(0)
      assert_equal 13, @result.get_int(4)
    end

    it 'is an instance of FFI::MemoryPointer' do
      @result.must_be_instance_of FFI::MemoryPointer
    end

    it 'is zero-terminated' do
      assert_equal 0, @result.get_int(8)
    end
  end

  describe 'an instance created with .from_array :utf8' do
    before do
      @result = GirFFI::InPointer.from_array :utf8, %w(foo bar baz)
    end

    it 'returns an array of pointers to strings' do
      ary = @result.read_array_of_pointer(3)
      assert_equal %w(foo bar baz), ary.map(&:read_string)
    end
  end

  describe 'an instance created with .from_array :filename' do
    before do
      @result = GirFFI::InPointer.from_array :filename, %w(foo bar baz)
    end

    it 'returns an array of pointers to strings' do
      ary = @result.read_array_of_pointer(3)
      assert_equal %w(foo bar baz), ary.map(&:read_string)
    end
  end

  describe 'an instance created with .from :utf8' do
    before do
      @result = GirFFI::InPointer.from :utf8, 'foo'
    end

    it 'returns a pointer to the given string' do
      assert_equal 'foo', @result.read_string
    end

    it 'is an instance of FFI::MemoryPointer' do
      @result.must_be_instance_of FFI::MemoryPointer
    end
  end

  describe 'an instance created with .from :guint32' do
    before do
      @result = GirFFI::InPointer.from :guint32, 12_345
    end

    it 'returns a pointer with an address equal to the given value' do
      assert_equal 12_345, @result.address
    end

    it 'is an instance of FFI::Pointer' do
      @result.must_be_instance_of FFI::Pointer
    end
  end

  describe 'an instance created with .from :filename' do
    before do
      @result = GirFFI::InPointer.from :filename, 'foo'
    end

    it 'returns a pointer to the given string' do
      assert_equal 'foo', @result.read_string
    end
  end

  describe '.from' do
    it 'returns nil when passed nil' do
      result = GirFFI::InPointer.from :foo, nil
      assert_nil result
    end

    it "sets the pointer's address to the passed value for type :gint8" do
      result = GirFFI::InPointer.from :gint8, 23
      assert_equal 23, result.address
    end

    it 'handles enum types' do
      e = Module.new do
        self::Enum = FFI::Enum.new [:foo, :bar, :baz], :qux
        def self.[](val)
          self::Enum[val]
        end
      end
      ptr = GirFFI::InPointer.from e, :bar
      ptr.address.must_equal 1
    end

    describe 'for type :void' do
      it 'returns the result of to_ptr' do
        obj = Object.new
        def obj.to_ptr
          :test_value
        end
        GirFFI::InPointer.from(:void, obj).must_equal :test_value
      end

      it 'returns nil when passed nil' do
        GirFFI::InPointer.from(:void, nil).must_equal nil
      end
    end

    describe 'for types that are classes' do
      it 'returns the result of to_ptr' do
        klass = Class.new
        obj = klass.new
        def obj.to_ptr
          :test_value
        end
        GirFFI::InPointer.from(klass, obj).must_equal :test_value
      end
    end
  end
end