package tgrich

import (
	"errors"
	"testing"
	"time"

	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
)

func TestRenderText(t *testing.T) {
	tests := []struct {
		name string
		text tgapi.RichText
		want string
	}{
		{"plain", Text("<text&>"), "&lt;text&amp;&gt;"},
		{"array", Concat(Bold(Text("bold")), Text(" plain")), "<b>bold</b> plain"},
		{"spoiler", Spoiler(Text("secret")), "<tg-spoiler>secret</tg-spoiler>"},
		{"date time", DateTimeWithFormat(Text("tomorrow"), time.Unix(1, 0), `w"DT`), `<tg-time unix="1" format="w&quot;DT">tomorrow</tg-time>`},
		{"custom emoji", Emoji("🙂", `id"`), `<tg-emoji emoji-id="id&quot;">🙂</tg-emoji>`},
		{"formula", MathExpression("x < y"), "<tg-math>x &lt; y</tg-math>"},
		{"automatic entity", Hashtag(Text("#go"), "go"), "#go"},
		{"reference", Reference(Text("note"), "note-1"), `<tg-reference name="note-1">note</tg-reference>`},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got, err := renderText(tt.text, 0)
			if err != nil {
				t.Fatal(err)
			}
			if got != tt.want {
				t.Fatalf("renderText() = %q, want %q", got, tt.want)
			}
		})
	}
}

func TestRenderTextRejectsUnknownWrapper(t *testing.T) {
	_, err := renderText(tgapi.RichTextWrap{Tag: "unknown", Text: Text("text")}, 0)
	if !errors.Is(err, ErrRichUnknownTag) {
		t.Fatalf("renderText() error = %v, want %v", err, ErrRichUnknownTag)
	}
}

func TestRenderTextNestingLimit(t *testing.T) {
	for _, tt := range []struct {
		name  string
		depth int
		want  error
	}{
		{"maximum", maxRichDepth, nil},
		{"too deep", maxRichDepth + 1, ErrRichNestingTooDeep},
	} {
		t.Run(tt.name, func(t *testing.T) {
			text := tgapi.RichText(Text("text"))
			for range tt.depth {
				text = Bold(text)
			}
			_, err := renderText(text, 0)
			if !errors.Is(err, tt.want) {
				t.Fatalf("renderText() error = %v, want %v", err, tt.want)
			}
		})
	}
}

func TestRenderBlockNestingLimit(t *testing.T) {
	for _, tt := range []struct {
		name  string
		depth int
		want  error
	}{
		{"maximum", maxRichDepth, nil},
		{"too deep", maxRichDepth + 1, ErrRichNestingTooDeep},
	} {
		t.Run(tt.name, func(t *testing.T) {
			var block tgapi.InputRichBlock = P(Text("text"))
			for range tt.depth - 1 {
				block = Details(Text("summary"), block)
			}
			_, err := renderBlockHTML(block, 0)
			if !errors.Is(err, tt.want) {
				t.Fatalf("renderBlockHTML() error = %v, want %v", err, tt.want)
			}
		})
	}
}

func TestRenderCombinedNestingLimit(t *testing.T) {
	for _, tt := range []struct {
		name      string
		textDepth int
		want      error
	}{
		{"maximum", maxRichDepth - 1, nil},
		{"too deep", maxRichDepth, ErrRichNestingTooDeep},
	} {
		t.Run(tt.name, func(t *testing.T) {
			text := tgapi.RichText(Text("text"))
			for range tt.textDepth {
				text = Bold(text)
			}

			_, err := renderBlockHTML(P(text), 0)
			if !errors.Is(err, tt.want) {
				t.Fatalf("renderBlockHTML() error = %v, want %v", err, tt.want)
			}
		})
	}
}