package client

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"strconv"
	"strings"
	"testing"
	"text/template"

	"github.com/goreleaser/goreleaser/internal/artifact"
	"github.com/goreleaser/goreleaser/pkg/config"
	"github.com/goreleaser/goreleaser/pkg/context"
	"github.com/stretchr/testify/require"
)

func TestGitLabReleaseURLTemplate(t *testing.T) {
	repo := config.Repo{
		Owner: "owner",
		Name:  "name",
	}
	tests := []struct {
		name            string
		repo            config.Repo
		downloadURL     string
		wantDownloadURL string
		wantErr         bool
	}{
		{
			name:            "default_download_url",
			downloadURL:     DefaultGitLabDownloadURL,
			repo:            repo,
			wantDownloadURL: "https://gitlab.com/owner/name/-/releases/{{ .Tag }}/downloads/{{ .ArtifactName }}",
		},
		{
			name:            "default_download_url_no_owner",
			downloadURL:     DefaultGitLabDownloadURL,
			repo:            config.Repo{Name: "name"},
			wantDownloadURL: "https://gitlab.com/name/-/releases/{{ .Tag }}/downloads/{{ .ArtifactName }}",
		},
		{
			name:            "download_url_template",
			repo:            repo,
			downloadURL:     "{{ .Env.GORELEASER_TEST_GITLAB_URLS_DOWNLOAD }}",
			wantDownloadURL: "https://gitlab.mycompany.com/owner/name/-/releases/{{ .Tag }}/downloads/{{ .ArtifactName }}",
		},
		{
			name:        "download_url_template_invalid_value",
			downloadURL: "{{ .Eenv.GORELEASER_NOT_EXISTS }}",
			wantErr:     true,
		},
		{
			name:        "download_url_template_invalid",
			downloadURL: "{{.dddddddddd",
			wantErr:     true,
		},
		{
			name:            "download_url_string",
			downloadURL:     "https://gitlab.mycompany.com",
			wantDownloadURL: "https://gitlab.mycompany.com/",
		},
	}

	for _, tt := range tests {
		ctx := context.New(config.Project{
			Env: []string{
				"GORELEASER_TEST_GITLAB_URLS_DOWNLOAD=https://gitlab.mycompany.com",
			},
			GitLabURLs: config.GitLabURLs{
				Download: tt.downloadURL,
			},
			Release: config.Release{
				GitLab: tt.repo,
			},
		})
		client, err := NewGitLab(ctx, ctx.Token)
		require.NoError(t, err)

		urlTpl, err := client.ReleaseURLTemplate(ctx)
		if tt.wantErr {
			require.Error(t, err)
			return
		}

		require.NoError(t, err)
		require.Equal(t, tt.wantDownloadURL, urlTpl)
	}
}

func TestGitLabURLsAPITemplate(t *testing.T) {
	tests := []struct {
		name     string
		apiURL   string
		wantHost string
	}{
		{
			name:     "default_values",
			wantHost: "gitlab.com",
		},
		{
			name:     "speicifed_api_env_key",
			apiURL:   "https://gitlab.mycompany.com",
			wantHost: "gitlab.mycompany.com",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			envs := []string{}
			gitlabURLs := config.GitLabURLs{}

			if tt.apiURL != "" {
				envs = append(envs, fmt.Sprintf("GORELEASER_TEST_GITLAB_URLS_API=%s", tt.apiURL))
				gitlabURLs.API = "{{ .Env.GORELEASER_TEST_GITLAB_URLS_API }}"
			}

			ctx := context.New(config.Project{
				Env:        envs,
				GitLabURLs: gitlabURLs,
			})

			client, err := NewGitLab(ctx, ctx.Token)
			require.NoError(t, err)

			gitlabClient, ok := client.(*gitlabClient)
			require.True(t, ok)

			require.Equal(t, tt.wantHost, gitlabClient.client.BaseURL().Host)
		})
	}

	t.Run("no_env_specified", func(t *testing.T) {
		ctx := context.New(config.Project{
			GitLabURLs: config.GitLabURLs{
				API: "{{ .Env.GORELEASER_NOT_EXISTS }}",
			},
		})

		_, err := NewGitLab(ctx, ctx.Token)
		require.ErrorAs(t, err, &template.ExecError{})
	})

	t.Run("invalid_template", func(t *testing.T) {
		ctx := context.New(config.Project{
			GitLabURLs: config.GitLabURLs{
				API: "{{.dddddddddd",
			},
		})

		_, err := NewGitLab(ctx, ctx.Token)
		require.Error(t, err)
	})
}

func TestGitLabURLsDownloadTemplate(t *testing.T) {
	tests := []struct {
		name               string
		usePackageRegistry bool
		downloadURL        string
		wantURL            string
		wantErr            bool
	}{
		{
			name:    "empty_download_url",
			wantURL: "/",
		},
		{
			name:        "download_url_template",
			downloadURL: "{{ .Env.GORELEASER_TEST_GITLAB_URLS_DOWNLOAD }}",
			wantURL:     "https://gitlab.mycompany.com/",
		},
		{
			name:        "download_url_template_invalid_value",
			downloadURL: "{{ .Eenv.GORELEASER_NOT_EXISTS }}",
			wantErr:     true,
		},
		{
			name:        "download_url_template_invalid",
			downloadURL: "{{.dddddddddd",
			wantErr:     true,
		},
		{
			name:        "download_url_string",
			downloadURL: "https://gitlab.mycompany.com",
			wantURL:     "https://gitlab.mycompany.com/",
		},
		{
			name:               "url_registry",
			wantURL:            "/api/v4/projects/test%2Ftest/packages/generic/projectname/v1%2E0%2E0/test",
			usePackageRegistry: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				defer fmt.Fprint(w, "{}")
				defer w.WriteHeader(http.StatusOK)
				defer r.Body.Close()

				if !strings.Contains(r.URL.Path, "assets/links") {
					_, _ = io.Copy(io.Discard, r.Body)
					return
				}

				b, err := io.ReadAll(r.Body)
				require.NoError(t, err)

				reqBody := map[string]interface{}{}
				err = json.Unmarshal(b, &reqBody)
				require.NoError(t, err)

				url := reqBody["url"].(string)
				require.Truef(t, strings.HasSuffix(url, tt.wantURL), "expected %q to end with %q", url, tt.wantURL)
			}))
			defer srv.Close()

			ctx := context.New(config.Project{
				ProjectName: "projectname",
				Env: []string{
					"GORELEASER_TEST_GITLAB_URLS_DOWNLOAD=https://gitlab.mycompany.com",
				},
				Release: config.Release{
					GitLab: config.Repo{
						Owner: "test",
						Name:  "test",
					},
				},
				GitLabURLs: config.GitLabURLs{
					API:                srv.URL,
					Download:           tt.downloadURL,
					UsePackageRegistry: tt.usePackageRegistry,
				},
			})

			ctx.Version = "v1.0.0"

			tmpFile, err := os.CreateTemp(t.TempDir(), "")
			require.NoError(t, err)

			client, err := NewGitLab(ctx, ctx.Token)
			require.NoError(t, err)

			err = client.Upload(ctx, "1234", &artifact.Artifact{Name: "test", Path: "some-path"}, tmpFile)
			if tt.wantErr {
				require.Error(t, err)
				return
			}
			require.NoError(t, err)
		})
	}
}

func TestGitLabCreateReleaseUknownHost(t *testing.T) {
	ctx := context.New(config.Project{
		Release: config.Release{
			GitLab: config.Repo{
				Owner: "owner",
				Name:  "name",
			},
		},
		GitLabURLs: config.GitLabURLs{
			API: "http://goreleaser-notexists",
		},
	})
	client, err := NewGitLab(ctx, "test-token")
	require.NoError(t, err)

	_, err = client.CreateRelease(ctx, "body")
	require.Error(t, err)
}

func TestGitLabCreateReleaseReleaseNotExists(t *testing.T) {
	notExistsStatusCodes := []int{http.StatusNotFound, http.StatusForbidden}

	for _, tt := range notExistsStatusCodes {
		t.Run(strconv.Itoa(tt), func(t *testing.T) {
			totalRequests := 0
			createdRelease := false
			srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				defer r.Body.Close()
				totalRequests++

				if !strings.Contains(r.URL.Path, "releases") {
					w.WriteHeader(http.StatusOK)
					fmt.Fprint(w, "{}")
					return
				}

				// Check if release exists
				if r.Method == http.MethodGet {
					w.WriteHeader(tt)
					fmt.Fprint(w, "{}")
					return
				}

				// Create release if it doens't exists
				if r.Method == http.MethodPost {
					createdRelease = true
					w.WriteHeader(http.StatusOK)
					fmt.Fprint(w, "{}")
					return
				}

				require.FailNow(t, "should not reach here")
			}))
			defer srv.Close()

			ctx := context.New(config.Project{
				GitLabURLs: config.GitLabURLs{
					API: srv.URL,
				},
			})
			client, err := NewGitLab(ctx, "test-token")
			require.NoError(t, err)

			_, err = client.CreateRelease(ctx, "body")
			require.NoError(t, err)
			require.True(t, createdRelease)
			require.Equal(t, 3, totalRequests)
		})
	}
}

func TestGitLabCreateReleaseUnkownHTTPError(t *testing.T) {
	totalRequests := 0
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		totalRequests++
		defer r.Body.Close()

		w.WriteHeader(http.StatusUnprocessableEntity)
		fmt.Fprint(w, "{}")
	}))
	defer srv.Close()

	ctx := context.New(config.Project{
		GitLabURLs: config.GitLabURLs{
			API: srv.URL,
		},
	})
	client, err := NewGitLab(ctx, "test-token")
	require.NoError(t, err)

	_, err = client.CreateRelease(ctx, "body")
	require.Error(t, err)
	require.Equal(t, 2, totalRequests)
}

func TestGitlabGetDefaultBranch(t *testing.T) {
	totalRequests := 0
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		totalRequests++
		defer r.Body.Close()

		// Assume the request to create a branch was good
		w.WriteHeader(http.StatusOK)
		fmt.Fprint(w, "{}")
	}))
	defer srv.Close()

	ctx := context.New(config.Project{
		GitLabURLs: config.GitLabURLs{
			API: srv.URL,
		},
	})
	client, err := NewGitLab(ctx, "test-token")
	require.NoError(t, err)
	repo := Repo{
		Owner:  "someone",
		Name:   "something",
		Branch: "somebranch",
	}

	_, err = client.GetDefaultBranch(ctx, repo)
	require.NoError(t, err)
	require.Equal(t, 2, totalRequests)
}

func TestGitlabGetDefaultBranchErr(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		defer r.Body.Close()

		// Assume the request to create a branch was good
		w.WriteHeader(http.StatusNotImplemented)
		fmt.Fprint(w, "{}")
	}))
	defer srv.Close()

	ctx := context.New(config.Project{
		GitLabURLs: config.GitLabURLs{
			API: srv.URL,
		},
	})
	client, err := NewGitLab(ctx, "test-token")
	require.NoError(t, err)
	repo := Repo{
		Owner:  "someone",
		Name:   "something",
		Branch: "somebranch",
	}

	_, err = client.GetDefaultBranch(ctx, repo)
	require.Error(t, err)
}

func TestGitlabChangelog(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if strings.HasSuffix(r.URL.Path, "projects/someone/something/repository/compare") {
			r, err := os.Open("testdata/gitlab/compare.json")
			require.NoError(t, err)
			_, err = io.Copy(w, r)
			require.NoError(t, err)
			return
		}
		defer r.Body.Close()
	}))
	defer srv.Close()

	ctx := context.New(config.Project{
		GitLabURLs: config.GitLabURLs{
			API: srv.URL,
		},
	})
	client, err := NewGitLab(ctx, "test-token")
	require.NoError(t, err)
	repo := Repo{
		Owner:  "someone",
		Name:   "something",
		Branch: "somebranch",
	}

	log, err := client.Changelog(ctx, repo, "v1.0.0", "v1.1.0")
	require.NoError(t, err)
	require.Equal(t, "6dcb09b5: Fix all the bugs (Joey User <joey@user.edu>)", log)
}

func TestGitlabCreateFile(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// Handle the test where we know the branch
		if strings.HasSuffix(r.URL.Path, "projects/someone/something/repository/files/newfile.txt") {
			_, err := io.Copy(w, strings.NewReader(`{ "file_path": "newfile.txt", "branch": "somebranch" }`))
			require.NoError(t, err)
			return
		}
		// Handle the test where we detect the branch
		if strings.HasSuffix(r.URL.Path, "projects/someone/something/repository/files/newfile-in-default.txt") {
			_, err := io.Copy(w, strings.NewReader(`{ "file_path": "newfile.txt", "branch": "main" }`))
			require.NoError(t, err)
			return
		}
		// File of doooom...gets created, but 404s when getting fetched
		if strings.HasSuffix(r.URL.Path, "projects/someone/something/repository/files/doomed-file-404.txt") {
			if r.Method == "PUT" {
				_, err := io.Copy(w, strings.NewReader(`{ "file_path": "doomed-file-404.txt", "branch": "main" }`))
				require.NoError(t, err)
			} else {
				w.WriteHeader(http.StatusNotFound)
			}
			return
		}

		defer r.Body.Close()
	}))
	defer srv.Close()

	ctx := context.New(config.Project{
		GitLabURLs: config.GitLabURLs{
			API: srv.URL,
		},
	})

	client, err := NewGitLab(ctx, "test-token")
	require.NoError(t, err)

	// Test using an arbitrary branch
	repo := Repo{
		Owner:  "someone",
		Name:   "something",
		Branch: "somebranch",
	}

	err = client.CreateFile(ctx, config.CommitAuthor{Name: repo.Owner}, repo, []byte("Hello there"), "newfile.txt", "test: test commit")
	require.NoError(t, err)

	// Test detecting the default branch
	repo = Repo{
		Owner: "someone",
		Name:  "something",
		// Note there is no branch here, gonna try and guess it!
	}

	err = client.CreateFile(ctx, config.CommitAuthor{Name: repo.Owner}, repo, []byte("Hello there"), "newfile-in-default.txt", "test: test commit")
	require.NoError(t, err)

	// Test a doomed file. This is a file that is 'successfully' created, but returns a 404 when trying to fetch
	repo = Repo{
		Owner:  "someone",
		Name:   "something",
		Branch: "doomed",
	}

	err = client.CreateFile(ctx, config.CommitAuthor{Name: repo.Owner}, repo, []byte("Hello there"), "doomed-file-404.txt", "test: test commit")
	require.Error(t, err)
}

func TestCloseMileston(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if strings.HasSuffix(r.URL.Path, "projects/someone/something/milestones") {
			r, err := os.Open("testdata/gitlab/milestones.json")
			require.NoError(t, err)
			_, err = io.Copy(w, r)
			require.NoError(t, err)
			return
		} else if strings.HasSuffix(r.URL.Path, "projects/someone/something/milestones/12") {
			r, err := os.Open("testdata/gitlab/milestone.json")
			require.NoError(t, err)
			_, err = io.Copy(w, r)
			require.NoError(t, err)
			return
		}
		defer r.Body.Close()
	}))
	defer srv.Close()

	ctx := context.New(config.Project{
		GitLabURLs: config.GitLabURLs{
			API: srv.URL,
		},
	})
	client, err := NewGitLab(ctx, "test-token")
	require.NoError(t, err)

	repo := Repo{
		Owner: "someone",
		Name:  "something",
	}

	err = client.CloseMilestone(ctx, repo, "10.0")
	require.NoError(t, err)

	// Be sure to error on missing milestones
	err = client.CloseMilestone(ctx, repo, "never-will-exist")
	require.Error(t, err)
}
