package workspacesdk_test

import (
	"strings"
	"testing"

	"github.com/stretchr/testify/require"

	"github.com/coder/coder/v2/codersdk/workspacesdk"
)

func TestParseSkillFrontmatter(t *testing.T) {
	t.Parallel()

	t.Run("Basic", func(t *testing.T) {
		t.Parallel()
		name, desc, body, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: my-skill\ndescription: Does a thing\n---\nBody text here.\n",
		)
		require.NoError(t, err)
		require.Equal(t, "my-skill", name)
		require.Equal(t, "Does a thing", desc)
		require.Equal(t, "Body text here.", body)
	})

	t.Run("QuotedValues", func(t *testing.T) {
		t.Parallel()
		name, desc, _, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: \"quoted-name\"\ndescription: 'single-quoted'\n---\n",
		)
		require.NoError(t, err)
		require.Equal(t, "quoted-name", name)
		require.Equal(t, "single-quoted", desc)
	})

	t.Run("EscapedDoubleQuotedValue", func(t *testing.T) {
		t.Parallel()
		_, desc, _, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: escaped\ndescription: \"Review \\\"critical\\\" C:\\\\paths.\"\n---\nBody\n",
		)
		require.NoError(t, err)
		require.Equal(t, "Review \"critical\" C:\\paths.", desc)
	})

	t.Run("FoldedDescription", func(t *testing.T) {
		t.Parallel()
		name, desc, body, err := workspacesdk.ParseSkillFrontmatter(
			strings.Join([]string{
				"---",
				"name: brainstorming",
				"description: >",
				"  Use before any creative work: features, components, functionality changes,",
				"  or behavior modifications. Turns ideas into approved designs through",
				"  collaborative dialog. Hard gate: no implementation action until the",
				"  design is presented and approved.",
				"",
				"---",
				"Use this skill.",
			}, "\n"),
		)
		require.NoError(t, err)
		require.Equal(t, "brainstorming", name)
		require.Equal(t, strings.Join([]string{
			"Use before any creative work: features, components, functionality changes,",
			"or behavior modifications. Turns ideas into approved designs through",
			"collaborative dialog. Hard gate: no implementation action until the",
			"design is presented and approved.",
		}, " "), desc)
		require.Equal(t, "Use this skill.", body)
	})

	t.Run("YAMLComments", func(t *testing.T) {
		t.Parallel()
		_, desc, _, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: plain-hash\ndescription: Build # test\n---\nBody\n",
		)
		require.NoError(t, err)
		require.Equal(t, "Build", desc)
	})

	t.Run("ErrorNullDescription", func(t *testing.T) {
		t.Parallel()
		_, _, _, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: null-description\ndescription: null\n---\nBody\n",
		)
		require.ErrorContains(t, err, `frontmatter field "description" must be a string`)
	})

	t.Run("NoDescription", func(t *testing.T) {
		t.Parallel()
		name, desc, body, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: minimal\n---\nSome body.\n",
		)
		require.NoError(t, err)
		require.Equal(t, "minimal", name)
		require.Empty(t, desc)
		require.Equal(t, "Some body.", body)
	})

	t.Run("HTMLCommentsStripped", func(t *testing.T) {
		t.Parallel()
		_, _, body, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: strip-test\n---\nBefore <!-- hidden --> after.\n",
		)
		require.NoError(t, err)
		require.Equal(t, "Before  after.", body)
	})

	t.Run("MultilineHTMLComment", func(t *testing.T) {
		t.Parallel()
		_, _, body, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: multi\n---\nKeep this.\n<!--\nRemove\nall of this.\n-->\nAnd this.\n",
		)
		require.NoError(t, err)
		require.Contains(t, body, "Keep this.")
		require.Contains(t, body, "And this.")
		require.NotContains(t, body, "Remove")
	})

	t.Run("BOMPrefix", func(t *testing.T) {
		t.Parallel()
		name, _, _, err := workspacesdk.ParseSkillFrontmatter(
			"\xef\xbb\xbf---\nname: bom-skill\n---\n",
		)
		require.NoError(t, err)
		require.Equal(t, "bom-skill", name)
	})

	t.Run("EmptyBody", func(t *testing.T) {
		t.Parallel()
		_, _, body, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: nobody\ndescription: has no body\n---\n",
		)
		require.NoError(t, err)
		require.Empty(t, body)
	})

	t.Run("YAMLKeysAreCaseSensitive", func(t *testing.T) {
		t.Parallel()
		_, _, _, err := workspacesdk.ParseSkillFrontmatter(
			"---\nName: upper\nDescription: Also upper\n---\n",
		)
		require.ErrorIs(t, err, workspacesdk.ErrFrontmatterNameRequired)
	})

	t.Run("UnknownKeysIgnored", func(t *testing.T) {
		t.Parallel()
		name, _, _, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: test\nauthor: someone\nversion: 1.0\n---\n",
		)
		require.NoError(t, err)
		require.Equal(t, "test", name)
	})

	t.Run("ErrorMissingOpenDelimiter", func(t *testing.T) {
		t.Parallel()
		_, _, _, err := workspacesdk.ParseSkillFrontmatter("no frontmatter here")
		require.ErrorContains(t, err, "missing opening frontmatter delimiter")
	})

	t.Run("ErrorMissingCloseDelimiter", func(t *testing.T) {
		t.Parallel()
		_, _, _, err := workspacesdk.ParseSkillFrontmatter("---\nname: oops\n")
		require.ErrorContains(t, err, "missing closing frontmatter delimiter")
	})

	t.Run("ErrorMissingName", func(t *testing.T) {
		t.Parallel()
		_, _, _, err := workspacesdk.ParseSkillFrontmatter(
			"---\ndescription: no name\n---\n",
		)
		require.ErrorIs(t, err, workspacesdk.ErrFrontmatterNameRequired)
		require.ErrorContains(t, err, "frontmatter missing required 'name' field")
	})

	t.Run("ErrorNullName", func(t *testing.T) {
		t.Parallel()
		_, _, _, err := workspacesdk.ParseSkillFrontmatter(
			"---\nname: null\n---\nBody\n",
		)
		require.ErrorIs(t, err, workspacesdk.ErrFrontmatterNameRequired)
		require.ErrorContains(t, err, `frontmatter field "name" must be a string`)
	})

	t.Run("WhitespaceAroundDelimiters", func(t *testing.T) {
		t.Parallel()
		name, _, _, err := workspacesdk.ParseSkillFrontmatter(
			"  ---  \nname: spaced\n  ---  \n",
		)
		require.NoError(t, err)
		require.Equal(t, "spaced", name)
	})
}