package repo

import (
	"errors"
	"net/http"
	"testing"
	"time"

	"code.gitea.io/sdk/gitea"
	log "github.com/sirupsen/logrus"
)

func clearCache() {
	pathCache.Flush()
	userCache.Flush()
	cspCache.Flush()
}

func TestPickingCorrectRepositoryDefault(t *testing.T) {
	// Test that we default to the <username>.<pages domain> repository, if we have only
	// one path component.
	defer clearCache()

	log.SetLevel(log.DebugLevel)
	client := GiteaClient{
		getRepository: func(username, repositoryName string) (Repository, error) {
			if username != "example-user" {
				t.Fatalf("Called with unknown user %s", username)
			}
			if repositoryName != "example-user.pages.example.org" {
				t.Fatalf("Called with unknown repository %s", repositoryName)
			}

			return Repository{}, nil
		},
		hasBranch: func(username, repositoryName, branchName string) bool {
			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branchName == "pages" {
				return true
			}

			return false
		},
		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
			t.Fatal("getFile called")
			return []byte{}, true, nil
		},
		lookupCNAME: func(domain string) (string, error) {
			t.Fatal("lookupCNAME called")
			return "", nil
		},
		lookupRepoTXT: func(domain string) (string, error) {
			t.Fatal("lookupRepoTXT called")
			return "", nil
		},
	}

	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "index.html", &client)
	if err != nil {
		t.Fatalf("An error occured: %v", err)
	}
	if res == nil {
		t.Fatal("Result is nil")
	}
	if path != "index.html" {
		t.Fatalf("Returned path is invalid: %s", path)
	}
}

func TestPickingCorrectRepositoryDefaultSubdirectory(t *testing.T) {
	// Test that we return the default repository when the first path component does
	// not correspong to an existing repository.
	defer clearCache()

	log.SetLevel(log.DebugLevel)
	client := GiteaClient{
		getRepository: func(username, repositoryName string) (Repository, error) {
			if username != "example-user" {
				t.Fatalf("Called with unknown user %s", username)
			}
			if repositoryName == "assets" {
				return Repository{}, errors.New("Repository does not exist")
			} else if repositoryName == "example-user.pages.example.org" {
				return Repository{}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return Repository{}, nil
			}
		},
		hasBranch: func(username, repositoryName, branchName string) bool {
			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branchName == "pages" {
				return true
			}

			return false
		},
		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
			t.Fatal("getFile called")
			return []byte{}, true, nil
		},
		lookupCNAME: func(domain string) (string, error) {
			t.Fatal("lookupCNAME called")
			return "", nil
		},
		lookupRepoTXT: func(domain string) (string, error) {
			t.Fatal("lookupRepoTXT called")
			return "", nil
		},
	}

	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "assets/index.css", &client)
	if err != nil {
		t.Fatalf("An error occured: %v", err)
	}
	if res == nil {
		t.Fatal("Result is nil")
	}
	if path != "assets/index.css" {
		t.Fatalf("Returned path is invalid: %s", path)
	}
}

func TestPickingCorrectRepositorySubdirectoryNoPagesBranch(t *testing.T) {
	// Test that we're picking the correct repository when the first path component
	// returns a repository without a pages branch.
	defer clearCache()

	log.SetLevel(log.DebugLevel)
	client := GiteaClient{
		getRepository: func(username, repositoryName string) (Repository, error) {
			if username != "example-user" {
				t.Fatalf("Called with unknown user %s", username)
			}
			if repositoryName == "blog" {
				return Repository{
					Name: "blog",
				}, nil
			} else if repositoryName == "example-user.pages.example.org" {
				return Repository{
					Name: "example-user.pages.example.org",
				}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return Repository{}, nil
			}
		},
		hasBranch: func(username, repositoryName, branchName string) bool {
			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branchName == "pages" {
				return true
			}

			return false
		},
		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
			t.Fatal("getFile called")
			return []byte{}, true, nil
		},
		lookupCNAME: func(domain string) (string, error) {
			t.Fatal("lookupCNAME called")
			return "", nil
		},
		lookupRepoTXT: func(domain string) (string, error) {
			t.Fatal("lookupRepoTXT called")
			return "", nil
		},
	}

	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "blog/post1.html", &client)
	if err != nil {
		t.Fatalf("An error occured: %v", err)
	}
	if res == nil {
		t.Fatal("Result is nil")
	}
	if res.Name != "example-user.pages.example.org" {
		t.Fatalf("Invalid repository selected: %s", res.Name)
	}
	if path != "blog/post1.html" {
		t.Fatalf("Returned path is invalid: %s", path)
	}
}

func TestPickingNoRepositoryInvalidCNAME(t *testing.T) {
	// Test that we're not picking a repository if the CNAME validation fails.
	defer clearCache()

	log.SetLevel(log.DebugLevel)
	client := GiteaClient{
		getRepository: func(username, repositoryName string) (Repository, error) {
			if username == "example-user" && repositoryName == "example-user.pages.example.org" {
				return Repository{
					Name: "example-user.pages.example.org",
				}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return Repository{}, nil
			}
		},
		hasBranch: func(username, repositoryName, branchName string) bool {
			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branchName == "pages" {
				return true
			}

			return false
		},
		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
			if username == "example-user" && repositoryName == "example-user.pages.example.org" && branch == "pages" && path == "CNAME" {
				return []byte("some-other-domain.local"), true, nil
			}

			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
			return []byte{}, true, nil
		},
		lookupCNAME: func(domain string) (string, error) {
			return "", errors.New("No CNAME")
		},
		lookupRepoTXT: func(domain string) (string, error) {
			return "", nil
		},
	}

	_, _, err := RepoFromPath("example-user", "example-user.pages.example.org", "example-user.local", "index.html", &client)
	if err == nil {
		t.Fatal("Repository returned even though CNAME validation should fail")
	}
}

func TestPickingRepositoryValidCNAME(t *testing.T) {
	// Test that we're picking a repository, given a CNAME, if the CNAME validation succeeds.
	defer clearCache()

	log.SetLevel(log.DebugLevel)
	client := GiteaClient{
		getRepository: func(username, repositoryName string) (Repository, error) {
			if username == "example-user" && repositoryName == "example-user.local" {
				return Repository{
					Name: "example-user.local",
				}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return Repository{}, nil
			}
		},
		hasBranch: func(username, repositoryName, branchName string) bool {
			if username == "example-user" && repositoryName == "example-user.local" && branchName == "pages" {
				return true
			}

			return false
		},
		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
			if username == "example-user" && repositoryName == "example-user.local" && branch == "pages" && path == "CNAME" {
				return []byte("example-user.local"), true, nil
			}

			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
			return []byte{}, true, nil
		},
		lookupCNAME: func(domain string) (string, error) {
			return "", errors.New("No CNAME")
		},
		lookupRepoTXT: func(domain string) (string, error) {
			return "", nil
		},
	}

	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "index.html", &client)
	if err != nil {
		t.Fatalf("Error returned: %v", err)
	}
	if repo.Name != "example-user.local" {
		t.Fatalf("Invalid repository name returned: %s", repo.Name)
	}
}

func TestPickingRepositoryValidCNAMEWithTXTLookup(t *testing.T) {
	// Test that we're picking a repository, given a CNAME, if the CNAME validation succeeds
	// and the TXT lookup returns something different.
	defer clearCache()

	log.SetLevel(log.DebugLevel)
	client := GiteaClient{
		getRepository: func(username, repositoryName string) (Repository, error) {
			if username == "example-user" && repositoryName == "some-different-repository" {
				return Repository{
					Name: "some-different-repository",
				}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return Repository{}, nil
			}
		},
		hasBranch: func(username, repositoryName, branchName string) bool {
			if username == "example-user" && repositoryName == "some-different-repository" && branchName == "pages" {
				return true
			}

			return false
		},
		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
			if username == "example-user" && repositoryName == "some-different-repository" && branch == "pages" && path == "CNAME" {
				return []byte("example-user.local"), true, nil
			}

			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
			return []byte{}, true, nil
		},
		lookupCNAME: func(domain string) (string, error) {
			return "", errors.New("No CNAME")
		},
		lookupRepoTXT: func(domain string) (string, error) {
			if domain == "example-user.local" {
				return "some-different-repository", nil
			}
			return "", nil
		},
	}

	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "index.html", &client)
	if err != nil {
		t.Fatalf("Error returned: %v", err)
	}
	if repo.Name != "some-different-repository" {
		t.Fatalf("Invalid repository name returned: %s", repo.Name)
	}
}

func TestPickingRepositoryValidCNAMEWithTXTLookupAndSubdirectory(t *testing.T) {
	// Test that we're picking a repository, given a CNAME, if the CNAME validation succeeds
	// and the TXT lookup returns something different. Additionally, we now have a subdirectory
	defer clearCache()

	log.SetLevel(log.DebugLevel)
	client := GiteaClient{
		getRepository: func(username, repositoryName string) (Repository, error) {
			if username == "example-user" && repositoryName == "some-different-repository" {
				return Repository{
					Name: "some-different-repository",
				}, nil
			}

			return Repository{}, errors.New("Unknown repository")
		},
		hasBranch: func(username, repositoryName, branchName string) bool {
			if username == "example-user" && repositoryName == "some-different-repository" && branchName == "pages" {
				return true
			}

			return false
		},
		GetFile: func(username, repositoryName, branch, path string, since *time.Time) ([]byte, bool, error) {
			if username == "example-user" && repositoryName == "some-different-repository" && branch == "pages" && path == "CNAME" {
				return []byte("example-user.local"), true, nil
			}

			t.Fatalf("Invalid file requested: %s/%s@%s:%s", username, repositoryName, branch, path)
			return []byte{}, true, nil
		},
		lookupCNAME: func(domain string) (string, error) {
			return "", errors.New("No CNAME")
		},
		lookupRepoTXT: func(domain string) (string, error) {
			if domain == "example-user.local" {
				return "some-different-repository", nil
			}
			return "", nil
		},
	}

	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "blog/index.html", &client)
	if err != nil {
		t.Fatalf("Error returned: %v", err)
	}
	if repo.Name != "some-different-repository" {
		t.Fatalf("Invalid repository name returned: %s", repo.Name)
	}
}

func TestGetCSPForRepositoryNegativeIntegration(t *testing.T) {
	defer clearCache()

	httpClient := http.Client{Timeout: 10 * time.Second}
	giteaClient, err := gitea.NewClient(
		"https://git.polynom.me",
		gitea.SetHTTPClient(&httpClient),
		gitea.SetToken(""),
		gitea.SetUserAgent("rio-testing"),
	)
	if err != nil {
		t.Fatalf("Failed to create Gitea client: %v", err)
	}
	client := NewGiteaClient("https://git.polynom.me", giteaClient)

	// The repository has no CSP file, so it should return the invalid value
	defaultValue := "<INVALID>"
	csp := GetCSPForRepository(
		"papatutuwawa",
		"rio",
		defaultValue,
		&client,
	)

	if csp != defaultValue {
		t.Fatalf("Unexpected CSP returned: %s", csp)
	}
}