package getproviders

import (
	"fmt"
	"regexp"
	"strings"
	"testing"

	"github.com/apparentlymart/go-versions/versions"
	"github.com/google/go-cmp/cmp"
	svchost "github.com/hashicorp/terraform-svchost"

	"github.com/hashicorp/terraform/addrs"
)

func TestSourceAvailableVersions(t *testing.T) {
	source, baseURL, close := testRegistrySource(t)
	defer close()

	tests := []struct {
		provider     string
		wantVersions []string
		wantErr      string
	}{
		// These test cases are relying on behaviors of the fake provider
		// registry server implemented in client_test.go.
		{
			"example.com/awesomesauce/happycloud",
			[]string{"1.0.0", "1.2.0"},
			``,
		},
		{
			"example.com/weaksauce/no-versions",
			nil,
			``, // having no versions is not an error, it's just odd
		},
		{
			"example.com/nonexist/nonexist",
			nil,
			`provider registry example.com does not have a provider named example.com/nonexist/nonexist`,
		},
		{
			"not.example.com/foo/bar",
			nil,
			`host not.example.com does not offer a Terraform provider registry`,
		},
		{
			"too-new.example.com/foo/bar",
			nil,
			`host too-new.example.com does not support the provider registry protocol required by this Terraform version, but may be compatible with a different Terraform version`,
		},
		{
			"fails.example.com/foo/bar",
			nil,
			`could not query provider registry for fails.example.com/foo/bar: Get ` + baseURL + `/fails-immediately/foo/bar/versions: EOF`,
		},
	}

	for _, test := range tests {
		t.Run(test.provider, func(t *testing.T) {
			// TEMP: We don't yet have a function for parsing provider
			// source addresses so we'll just fake it in here for now.
			parts := strings.Split(test.provider, "/")
			providerAddr := addrs.Provider{
				Hostname:  svchost.Hostname(parts[0]),
				Namespace: parts[1],
				Type:      parts[2],
			}

			gotVersions, err := source.AvailableVersions(providerAddr)

			if err != nil {
				if test.wantErr == "" {
					t.Fatalf("wrong error\ngot:  %s\nwant: <nil>", err.Error())
				}
				if got, want := err.Error(), test.wantErr; got != want {
					t.Fatalf("wrong error\ngot:  %s\nwant: %s", got, want)
				}
				return
			}

			if test.wantErr != "" {
				t.Fatalf("wrong error\ngot:  <nil>\nwant: %s", test.wantErr)
			}

			var gotVersionsStr []string
			if gotVersions != nil {
				gotVersionsStr = make([]string, len(gotVersions))
				for i, v := range gotVersions {
					gotVersionsStr[i] = v.String()
				}
			}

			if diff := cmp.Diff(test.wantVersions, gotVersionsStr); diff != "" {
				t.Errorf("wrong result\n%s", diff)
			}
		})
	}

}

func TestSourcePackageMeta(t *testing.T) {
	source, baseURL, close := testRegistrySource(t)
	defer close()

	tests := []struct {
		provider string
		version  string
		os, arch string
		want     PackageMeta
		wantErr  string
	}{
		// These test cases are relying on behaviors of the fake provider
		// registry server implemented in client_test.go.
		{
			"example.com/awesomesauce/happycloud",
			"1.2.0",
			"linux", "amd64",
			PackageMeta{
				ProtocolVersions: VersionList{versions.MustParseVersion("5.0.0")},
				TargetPlatform:   Platform{"linux", "amd64"},
				Filename:         "happycloud_1.2.0.zip",
				Location:         PackageHTTPURL(baseURL + "/pkg/happycloud_1.2.0.zip"),
				SHA256Sum:        [32]uint8{30: 0xf0, 31: 0x0d}, // fake registry uses a memorable sum
			},
			``,
		},
		{
			"example.com/awesomesauce/happycloud",
			"1.2.0",
			"nonexist", "amd64",
			PackageMeta{},
			`provider example.com/awesomesauce/happycloud 1.2.0 is not available for nonexist_amd64`,
		},
		{
			"not.example.com/awesomesauce/happycloud",
			"1.2.0",
			"linux", "amd64",
			PackageMeta{},
			`host not.example.com does not offer a Terraform provider registry`,
		},
		{
			"too-new.example.com/awesomesauce/happycloud",
			"1.2.0",
			"linux", "amd64",
			PackageMeta{},
			`host too-new.example.com does not support the provider registry protocol required by this Terraform version, but may be compatible with a different Terraform version`,
		},
		{
			"fails.example.com/awesomesauce/happycloud",
			"1.2.0",
			"linux", "amd64",
			PackageMeta{},
			`could not query provider registry for fails.example.com/awesomesauce/happycloud: Get http://placeholder-origin/fails-immediately/awesomesauce/happycloud/1.2.0/download/linux/amd64: EOF`,
		},
	}

	// Sometimes error messages contain specific HTTP endpoint URLs, but
	// since our test server is on a random port we'd not be able to
	// consistently match those. Instead, we'll normalize the URLs.
	urlPattern := regexp.MustCompile(`http://[^/]+/`)

	cmpOpts := cmp.Comparer(Version.Same)

	for _, test := range tests {
		t.Run(fmt.Sprintf("%s for %s_%s", test.provider, test.os, test.arch), func(t *testing.T) {
			// TEMP: We don't yet have a function for parsing provider
			// source addresses so we'll just fake it in here for now.
			parts := strings.Split(test.provider, "/")
			providerAddr := addrs.Provider{
				Hostname:  svchost.Hostname(parts[0]),
				Namespace: parts[1],
				Type:      parts[2],
			}

			version := versions.MustParseVersion(test.version)

			got, err := source.PackageMeta(providerAddr, version, Platform{test.os, test.arch})

			if err != nil {
				if test.wantErr == "" {
					t.Fatalf("wrong error\ngot:  %s\nwant: <nil>", err.Error())
				}
				gotErr := urlPattern.ReplaceAllLiteralString(err.Error(), "http://placeholder-origin/")
				if got, want := gotErr, test.wantErr; got != want {
					t.Fatalf("wrong error\ngot:  %s\nwant: %s", got, want)
				}
				return
			}

			if test.wantErr != "" {
				t.Fatalf("wrong error\ngot:  <nil>\nwant: %s", test.wantErr)
			}

			if diff := cmp.Diff(test.want, got, cmpOpts); diff != "" {
				t.Errorf("wrong result\n%s", diff)
			}
		})
	}

}