// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package cargo

import (
	"bytes"
	"encoding/binary"
	"io"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
)

func TestParsePackage(t *testing.T) {
	const (
		description = "Package Description"
		author      = "KN4CK3R"
		homepage    = "https://gitea.io/"
		license     = "MIT"
		payload     = "gitea test dummy payload" // a fake payload for test only
	)
	makeDefaultPackageMeta := func(name, version string) string {
		return `{
   "name":"` + name + `",
   "vers":"` + version + `",
   "description":"` + description + `",
   "authors": ["` + author + `"],
   "deps":[
      {
         "name":"dep",
         "version_req":"1.0"
      }
   ],
   "homepage":"` + homepage + `",
   "license":"` + license + `"
}`
	}
	createPackage := func(metadata string) io.Reader {
		var buf bytes.Buffer
		binary.Write(&buf, binary.LittleEndian, uint32(len(metadata)))
		buf.WriteString(metadata)
		binary.Write(&buf, binary.LittleEndian, uint32(len(payload)))
		buf.WriteString(payload)
		return &buf
	}

	t.Run("InvalidName", func(t *testing.T) {
		for _, name := range []string{"", "0test", "-test", "_test", strings.Repeat("a", 65)} {
			data := createPackage(makeDefaultPackageMeta(name, "1.0.0"))

			cp, err := ParsePackage(data)
			assert.Nil(t, cp)
			assert.ErrorIs(t, err, ErrInvalidName)
		}
	})

	t.Run("InvalidVersion", func(t *testing.T) {
		for _, version := range []string{"", "1.", "-1.0", "1.0.0/1"} {
			data := createPackage(makeDefaultPackageMeta("test", version))

			cp, err := ParsePackage(data)
			assert.Nil(t, cp)
			assert.ErrorIs(t, err, ErrInvalidVersion)
		}
	})

	t.Run("Valid", func(t *testing.T) {
		data := createPackage(makeDefaultPackageMeta("test", "1.0.0"))

		cp, err := ParsePackage(data)
		assert.NotNil(t, cp)
		assert.NoError(t, err)

		assert.Equal(t, "test", cp.Name)
		assert.Equal(t, "1.0.0", cp.Version)
		assert.Equal(t, description, cp.Metadata.Description)
		assert.Equal(t, []string{author}, cp.Metadata.Authors)
		assert.Len(t, cp.Metadata.Dependencies, 1)
		assert.Equal(t, "dep", cp.Metadata.Dependencies[0].Name)
		assert.Nil(t, cp.Metadata.Dependencies[0].Package)
		assert.Equal(t, homepage, cp.Metadata.ProjectURL)
		assert.Equal(t, license, cp.Metadata.License)
		content, _ := io.ReadAll(cp.Content)
		assert.Equal(t, payload, string(content))
	})

	t.Run("Renamed", func(t *testing.T) {
		data := createPackage(`{
   "name":"test-pkg",
   "vers":"1.0",
   "description":"test-desc",
   "authors": ["test-author"],
   "deps":[
      {
         "name":"dep-renamed",
         "explicit_name_in_toml":"dep-explicit",
         "version_req":"1.0"
      }
   ],
   "homepage":"https://gitea.io/",
   "license":"MIT"
}`)
		cp, err := ParsePackage(data)
		assert.NoError(t, err)
		assert.Equal(t, "test-pkg", cp.Name)
		assert.Equal(t, "https://gitea.io/", cp.Metadata.ProjectURL)
		assert.Equal(t, "dep-explicit", cp.Metadata.Dependencies[0].Name)
		assert.Equal(t, "dep-renamed", *cp.Metadata.Dependencies[0].Package)
	})
}