package formatter

import (
	"testing"

	"github.com/zelenin/go-tdlib/client"
)

func TestNoFormatting(t *testing.T) {
	markup := Format("abc\ndef", []*client.TextEntity{}, EntityToMarkdown)
	if markup != "abc\ndef" {
		t.Errorf("No formatting expected, but: %v", markup)
	}
}

func TestFormattingSimple(t *testing.T) {
	markup := Format("👙🐧🐖", []*client.TextEntity{
		&client.TextEntity{
			Offset: 2,
			Length: 4,
			Type:   &client.TextEntityTypeBold{},
		},
	}, EntityToMarkdown)
	if markup != "👙**🐧🐖**" {
		t.Errorf("Wrong simple formatting: %v", markup)
	}
}

func TestFormattingAdjacent(t *testing.T) {
	markup := Format("a👙🐧🐖", []*client.TextEntity{
		&client.TextEntity{
			Offset: 3,
			Length: 2,
			Type:   &client.TextEntityTypeItalic{},
		},
		&client.TextEntity{
			Offset: 5,
			Length: 2,
			Type: &client.TextEntityTypeTextUrl{
				Url: "https://narayana.im/",
			},
		},
	}, EntityToMarkdown)
	if markup != "a👙_🐧_[🐖](https://narayana.im/)" {
		t.Errorf("Wrong adjacent formatting: %v", markup)
	}
}

func TestFormattingAdjacentAndNested(t *testing.T) {
	markup := Format("👙🐧🐖", []*client.TextEntity{
		&client.TextEntity{
			Offset: 0,
			Length: 4,
			Type:   &client.TextEntityTypePre{},
		},
		&client.TextEntity{
			Offset: 0,
			Length: 2,
			Type:   &client.TextEntityTypeBold{},
		},
		&client.TextEntity{
			Offset: 4,
			Length: 2,
			Type:   &client.TextEntityTypeItalic{},
		},
	}, EntityToMarkdown)
	if markup != "\n```\n**👙**🐧\n```\n_🐖_" {
		t.Errorf("Wrong adjacent&nested formatting: %v", markup)
	}
}

func TestRebalanceTwoZero(t *testing.T) {
	s1 := InsertionStack{
		&Insertion{Offset: 7},
		&Insertion{Offset: 8},
	}
	s2 := InsertionStack{}
	s1, s2 = s1.rebalance(s2, 7)
	if !(len(s1) == 2 && len(s2) == 0 && s1[0].Offset == 7 && s1[1].Offset == 8) {
		t.Errorf("Wrong rebalance 2–0: %#v %#v", s1, s2)
	}
}

func TestRebalanceNeeded(t *testing.T) {
	s1 := InsertionStack{
		&Insertion{Offset: 7},
		&Insertion{Offset: 8},
	}
	s2 := InsertionStack{
		&Insertion{Offset: 10},
		&Insertion{Offset: 9},
	}
	s1, s2 = s1.rebalance(s2, 9)
	if !(len(s1) == 3 && len(s2) == 1 &&
		s1[0].Offset == 7 && s1[1].Offset == 8 && s1[2].Offset == 9 &&
		s2[0].Offset == 10) {
		t.Errorf("Wrong rebalance when needed: %#v %#v", s1, s2)
	}
}

func TestRebalanceNotNeeded(t *testing.T) {
	s1 := InsertionStack{
		&Insertion{Offset: 7},
		&Insertion{Offset: 8},
	}
	s2 := InsertionStack{
		&Insertion{Offset: 10},
		&Insertion{Offset: 9},
	}
	s1, s2 = s1.rebalance(s2, 8)
	if !(len(s1) == 2 && len(s2) == 2 &&
		s1[0].Offset == 7 && s1[1].Offset == 8 &&
		s2[0].Offset == 10 && s2[1].Offset == 9) {
		t.Errorf("Wrong rebalance when not needed: %#v %#v", s1, s2)
	}
}

func TestRebalanceLate(t *testing.T) {
	s1 := InsertionStack{
		&Insertion{Offset: 7},
		&Insertion{Offset: 8},
	}
	s2 := InsertionStack{
		&Insertion{Offset: 10},
		&Insertion{Offset: 9},
	}
	s1, s2 = s1.rebalance(s2, 10)
	if !(len(s1) == 4 && len(s2) == 0 &&
		s1[0].Offset == 7 && s1[1].Offset == 8 &&
		s1[2].Offset == 9 && s1[3].Offset == 10) {
		t.Errorf("Wrong rebalance when late: %#v %#v", s1, s2)
	}
}

func TestIteratorEmpty(t *testing.T) {
	s := InsertionStack{}
	g := s.NewIterator()
	v := g()
	if v != nil {
		t.Errorf("Empty iterator should return nil but returned %#v", v)
	}
}

func TestIterator(t *testing.T) {
	s := InsertionStack{
		&Insertion{Offset: 7},
		&Insertion{Offset: 8},
	}
	g := s.NewIterator()
	v := g()
	if v == nil || v.Offset != 7 {
		t.Errorf("Wrong insertion instead of 7: %#v", v)
	}
	v = g()
	if v == nil || v.Offset != 8 {
		t.Errorf("Wrong insertion instead of 8: %#v", v)
	}
	v = g()
	if v != nil {
		t.Errorf("nil should be returned after end, %#v instead", v)
	}
	v = g()
	if v != nil {
		t.Errorf("Further attempts should return nil too, %#v instead", v)
	}
}

func TestSortEntities(t *testing.T) {
	entities := []*client.TextEntity{
		&client.TextEntity{
			Offset: 3,
			Length: 2,
		},
		&client.TextEntity{
			Offset: 5,
			Length: 2,
		},
		&client.TextEntity{
			Offset: 7,
			Length: 2,
		},
		&client.TextEntity{
			Offset: 6,
			Length: 1,
		},
		&client.TextEntity{
			Offset: 5,
			Length: 1,
		},
	}
	entities = SortEntities(entities)
	if !(len(entities) == 5 &&
		entities[0].Offset == 3 && entities[0].Length == 2 &&
		entities[1].Offset == 5 && entities[1].Length == 2 &&
		entities[2].Offset == 5 && entities[2].Length == 1 &&
		entities[3].Offset == 6 && entities[3].Length == 1 &&
		entities[4].Offset == 7 && entities[4].Length == 2) {
		t.Errorf("Wrong sorting order: %#v", entities)
	}
}

func TestSortEmpty(t *testing.T) {
	entities := []*client.TextEntity{}
	entities = SortEntities(entities)
	if len(entities) != 0 {
		t.Errorf("Empty entities set sorting error: %#v", entities)
	}
}