package repo

import (
	"errors"
	"strings"
	"testing"
	"time"

	"git.polynom.me/rio/internal/context"
	"git.polynom.me/rio/internal/gitea"

	log "github.com/sirupsen/logrus"
)

func TestHeaderFilter(t *testing.T) {
	map1 := filterHeaders(
		map[string]interface{}{
			"Content-Type":            "hallo",
			"content-Type":            "welt",
			"content-type":            "uwu",
			"CONTENT-TYPE":            "lol",
			"Content-Security-Policy": "none",
		},
	)

	if len(map1) != 1 {
		t.Fatalf("filterHeaders allowed %d != 1 headers", len(map1))
	}

	for key := range map1 {
		if strings.ToLower(key) == "content-type" {
			t.Fatalf("filterHeaders allowed Content-Type")
		}
	}
}

func TestPickingCorrectRepositoryDefault(t *testing.T) {
	// Test that we default to the <username>.<pages domain> repository, if we have only
	// one path component.
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.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 gitea.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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "index.html", ctx)
	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.
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
			if username != "example-user" {
				t.Fatalf("Called with unknown user %s", username)
			}
			if repositoryName == "assets" {
				return gitea.Repository{}, errors.New("gitea.Repository does not exist")
			} else if repositoryName == "example-user.pages.example.org" {
				return gitea.Repository{}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return gitea.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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "assets/index.css", ctx)
	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.
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
			if username != "example-user" {
				t.Fatalf("Called with unknown user %s", username)
			}
			if repositoryName == "blog" {
				return gitea.Repository{
					Name: "blog",
				}, nil
			} else if repositoryName == "example-user.pages.example.org" {
				return gitea.Repository{
					Name: "example-user.pages.example.org",
				}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return gitea.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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	res, path, err := RepoFromPath("example-user", "example-user.pages.example.org", "", "blog/post1.html", ctx)
	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.
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
			if username == "example-user" && repositoryName == "example-user.pages.example.org" {
				return gitea.Repository{
					Name: "example-user.pages.example.org",
				}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return gitea.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 == "rio.json" {
				return []byte("{\"CNAME\": \"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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	_, _, err := RepoFromPath("example-user", "example-user.pages.example.org", "example-user.local", "index.html", ctx)
	if err == nil {
		t.Fatal("gitea.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.
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
			if username == "example-user" && repositoryName == "example-user.local" {
				return gitea.Repository{
					Name: "example-user.local",
				}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return gitea.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 == "rio.json" {
				return []byte("{\"CNAME\": \"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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "index.html", ctx)
	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.
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
			if username == "example-user" && repositoryName == "some-different-repository" {
				return gitea.Repository{
					Name: "some-different-repository",
				}, nil
			} else {
				t.Fatalf("Called with unknown repository %s", repositoryName)
				return gitea.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 == "rio.json" {
				return []byte("{\"CNAME\": \"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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "index.html", ctx)
	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
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
			if username == "example-user" && repositoryName == "some-different-repository" {
				return gitea.Repository{
					Name: "some-different-repository",
				}, nil
			}

			return gitea.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 == "rio.json" {
				return []byte("{\"CNAME\": \"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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	repo, _, err := RepoFromPath("example-user", "example-user.local", "example-user.pages.example.org", "blog/index.html", ctx)
	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 TestHeaderParsingEmpty(t *testing.T) {
	// Test that we are correctly handling a repository with no headers.
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
			if username == "example-user" && repositoryName == "some-different-repository" {
				return gitea.Repository{
					Name: "some-different-repository",
				}, nil
			}

			return gitea.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 == "rio.json" {
				return []byte("{\"CNAME\": \"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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	info := GetRepositoryInformation("example-user", "some-different-repository", ctx)
	if info == nil {
		t.Fatalf("No repository information returned")
	}

	if len(info.Headers) > 0 {
		t.Fatalf("Headers returned: %v", info.Headers)
	}
}

func TestHeaderParsing(t *testing.T) {
	// Test that we are correctly handling a repository with no headers.
	log.SetLevel(log.DebugLevel)
	client := gitea.GiteaClient{
		GetRepository: func(username, repositoryName string) (gitea.Repository, error) {
			if username == "example-user" && repositoryName == "some-different-repository" {
				return gitea.Repository{
					Name: "some-different-repository",
				}, nil
			}

			return gitea.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 == "rio.json" {
				return []byte("{\"CNAME\": \"example-user.local\", \"headers\": {\"X-Cool-Header\": \"Very nice!\"}}"), 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
		},
	}
	ctx := &context.GlobalContext{
		Gitea: &client,
		Cache: &context.CacheContext{
			RepositoryInformationCache: context.MakeRepoInfoCache(),
			RepositoryPathCache:        context.MakeRepoPathCache(),
		},
	}

	info := GetRepositoryInformation("example-user", "some-different-repository", ctx)
	if info == nil {
		t.Fatalf("No repository information returned")
	}

	if len(info.Headers) != 1 {
		t.Fatalf("len(info.Headers) != 1: %v", info.Headers)
	}

	header, found := info.Headers["X-Cool-Header"]
	if !found {
		t.Fatal("Header X-Cool-Header not found")
	}

	if header != "Very nice!" {
		t.Fatalf("Invalid header value for X-Cool-Header: \"%s\"", header)
	}
}