package ansi

import (
	"bytes"
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"github.com/charmbracelet/x/exp/golden"
	"github.com/muesli/termenv"
	"github.com/yuin/goldmark"
	emoji "github.com/yuin/goldmark-emoji"
	"github.com/yuin/goldmark/extension"
	"github.com/yuin/goldmark/parser"
	"github.com/yuin/goldmark/renderer"
	"github.com/yuin/goldmark/util"
)

const (
	examplesDir = "../styles/examples/"
	issuesDir   = "../testdata/issues/"
)

func TestRenderer(t *testing.T) {
	files, err := filepath.Glob(examplesDir + "*.md")
	if err != nil {
		t.Fatal(err)
	}

	for _, f := range files {
		bn := strings.TrimSuffix(filepath.Base(f), ".md")
		t.Run(bn, func(t *testing.T) {
			sn := filepath.Join(examplesDir, bn+".style")

			in, err := os.ReadFile(f)
			if err != nil {
				t.Fatal(err)
			}
			b, err := os.ReadFile(sn)
			if err != nil {
				t.Fatal(err)
			}

			options := Options{
				WordWrap:     80,
				ColorProfile: termenv.TrueColor,
			}
			err = json.Unmarshal(b, &options.Styles)
			if err != nil {
				t.Fatal(err)
			}

			md := goldmark.New(
				goldmark.WithExtensions(
					extension.GFM,
					extension.DefinitionList,
					emoji.Emoji,
				),
				goldmark.WithParserOptions(
					parser.WithAutoHeadingID(),
				),
			)

			ar := NewRenderer(options)
			md.SetRenderer(
				renderer.NewRenderer(
					renderer.WithNodeRenderers(util.Prioritized(ar, 1000))))

			var buf bytes.Buffer
			if err := md.Convert(in, &buf); err != nil {
				t.Error(err)
			}

			golden.RequireEqual(t, buf.Bytes())
		})
	}
}

func TestRendererIssues(t *testing.T) {
	files, err := filepath.Glob(issuesDir + "*.md")
	if err != nil {
		t.Fatal(err)
	}

	for _, f := range files {
		bn := strings.TrimSuffix(filepath.Base(f), ".md")
		t.Run(bn, func(t *testing.T) {
			in, err := os.ReadFile(f)
			if err != nil {
				t.Fatal(err)
			}
			b, err := os.ReadFile("../styles/dark.json")
			if err != nil {
				t.Fatal(err)
			}

			options := Options{
				WordWrap:     80,
				ColorProfile: termenv.TrueColor,
			}
			err = json.Unmarshal(b, &options.Styles)
			if err != nil {
				t.Fatal(err)
			}

			md := goldmark.New(
				goldmark.WithExtensions(
					extension.GFM,
					extension.DefinitionList,
					emoji.Emoji,
				),
				goldmark.WithParserOptions(
					parser.WithAutoHeadingID(),
				),
			)

			ar := NewRenderer(options)
			md.SetRenderer(
				renderer.NewRenderer(
					renderer.WithNodeRenderers(util.Prioritized(ar, 1000))))

			var buf bytes.Buffer
			if err := md.Convert(in, &buf); err != nil {
				t.Error(err)
			}

			golden.RequireEqual(t, buf.Bytes())
		})
	}
}