// Copyright 2022 Woodpecker Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package forge_test

import (
	"context"
	"crypto/ed25519"
	"crypto/rand"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"testing"
	"time"

	"github.com/go-ap/httpsig"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"

	"go.woodpecker-ci.org/woodpecker/v2/server/forge"
	"go.woodpecker-ci.org/woodpecker/v2/server/forge/mocks"
	forge_types "go.woodpecker-ci.org/woodpecker/v2/server/forge/types"
	"go.woodpecker-ci.org/woodpecker/v2/server/model"
	"go.woodpecker-ci.org/woodpecker/v2/server/plugins/config"
)

func TestFetch(t *testing.T) {
	t.Parallel()

	type file struct {
		name string
		data []byte
	}

	dummyData := []byte("TEST")

	testTable := []struct {
		name              string
		repoConfig        string
		files             []file
		expectedFileNames []string
		expectedError     bool
	}{
		{
			name:       "Default config - .woodpecker/",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker/text.txt",
				data: dummyData,
			}, {
				name: ".woodpecker/release.yml",
				data: dummyData,
			}, {
				name: ".woodpecker/image.png",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker/release.yml",
			},
			expectedError: false,
		},
		{
			name:       "Default config with .yaml - .woodpecker/",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker/text.txt",
				data: dummyData,
			}, {
				name: ".woodpecker/release.yaml",
				data: dummyData,
			}, {
				name: ".woodpecker/image.png",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker/release.yaml",
			},
			expectedError: false,
		},
		{
			name:       "Default config with .yaml, .yml mix - .woodpecker/",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker/text.txt",
				data: dummyData,
			}, {
				name: ".woodpecker/release.yaml",
				data: dummyData,
			}, {
				name: ".woodpecker/other.yml",
				data: dummyData,
			}, {
				name: ".woodpecker/image.png",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker/release.yaml",
				".woodpecker/other.yml",
			},
			expectedError: false,
		},
		{
			name:       "Default config check .woodpecker.yaml before .woodpecker.yml",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker.yaml",
				data: dummyData,
			}, {
				name: ".woodpecker.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker.yaml",
			},
			expectedError: false,
		},
		{
			name:       "Override via API with custom config",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker.yml",
			},
			expectedError: false,
		},
		{
			name:       "Use old config on 204 response",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker.yaml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker.yaml",
			},
			expectedError: false,
		},
		{
			name:              "Default config - Empty repo",
			repoConfig:        "",
			files:             []file{},
			expectedFileNames: []string{},
			expectedError:     true,
		},
		{
			name:       "Default config - Additional sub-folders",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker/test.yml",
				data: dummyData,
			}, {
				name: ".woodpecker/sub-folder/config.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker/test.yml",
			},
			expectedError: false,
		},
		{
			name:       "Default config - Additional none .yml files",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker/notes.txt",
				data: dummyData,
			}, {
				name: ".woodpecker/image.png",
				data: dummyData,
			}, {
				name: ".woodpecker/test.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker/test.yml",
			},
			expectedError: false,
		},
		{
			name:       "Default config - Empty Folder",
			repoConfig: " ",
			files: []file{{
				name: ".woodpecker/.keep",
				data: dummyData,
			}, {
				name: ".woodpecker.yml",
				data: nil,
			}, {
				name: ".woodpecker.yaml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".woodpecker.yaml",
			},
			expectedError: false,
		},
		{
			name:       "Special config - folder (ignoring default files)",
			repoConfig: ".my-ci-folder/",
			files: []file{{
				name: ".woodpecker/test.yml",
				data: dummyData,
			}, {
				name: ".woodpecker.yml",
				data: dummyData,
			}, {
				name: ".woodpecker.yaml",
				data: dummyData,
			}, {
				name: ".my-ci-folder/test.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".my-ci-folder/test.yml",
			},
			expectedError: false,
		},
		{
			name:       "Special config - folder",
			repoConfig: ".my-ci-folder/",
			files: []file{{
				name: ".my-ci-folder/test.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".my-ci-folder/test.yml",
			},
			expectedError: false,
		},
		{
			name:       "Special config - subfolder",
			repoConfig: ".my-ci-folder/my-config/",
			files: []file{{
				name: ".my-ci-folder/my-config/test.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".my-ci-folder/my-config/test.yml",
			},
			expectedError: false,
		},
		{
			name:       "Special config - file",
			repoConfig: ".config.yml",
			files: []file{{
				name: ".config.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".config.yml",
			},
			expectedError: false,
		},
		{
			name:       "Special config - file inside subfolder",
			repoConfig: ".my-ci-folder/sub-folder/config.yml",
			files: []file{{
				name: ".my-ci-folder/sub-folder/config.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".my-ci-folder/sub-folder/config.yml",
			},
			expectedError: false,
		},
		{
			name:              "Special config - empty repo",
			repoConfig:        ".config.yml",
			files:             []file{},
			expectedFileNames: []string{},
			expectedError:     true,
		},
	}

	for _, tt := range testTable {
		t.Run(tt.name, func(t *testing.T) {
			repo := &model.Repo{Owner: "laszlocph", Name: "multipipeline", Config: tt.repoConfig}

			f := new(mocks.Forge)
			dirs := map[string][]*forge_types.FileMeta{}
			for _, file := range tt.files {
				f.On("File", mock.Anything, mock.Anything, mock.Anything, mock.Anything, file.name).Return(file.data, nil)
				path := filepath.Dir(file.name)
				if path != "." {
					dirs[path] = append(dirs[path], &forge_types.FileMeta{
						Name: file.name,
						Data: file.data,
					})
				}
			}

			for path, files := range dirs {
				f.On("Dir", mock.Anything, mock.Anything, mock.Anything, mock.Anything, path).Return(files, nil)
			}

			// if the previous mocks do not match return not found errors
			f.On("File", mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil, fmt.Errorf("file not found"))
			f.On("Dir", mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil, fmt.Errorf("directory not found"))

			configFetcher := forge.NewConfigFetcher(
				f,
				time.Second*3,
				nil,
				&model.User{Token: "xxx"},
				repo,
				&model.Pipeline{Commit: "89ab7b2d6bfb347144ac7c557e638ab402848fee"},
			)
			files, err := configFetcher.Fetch(context.Background())
			if tt.expectedError && err == nil {
				t.Fatal("expected an error")
			} else if !tt.expectedError && err != nil {
				t.Fatal("error fetching config:", err)
			}

			matchingFiles := make([]string, len(files))
			for i := range files {
				matchingFiles[i] = files[i].Name
			}
			assert.ElementsMatch(t, tt.expectedFileNames, matchingFiles, "expected some other pipeline files")
		})
	}
}

func TestFetchFromConfigService(t *testing.T) {
	t.Parallel()

	type file struct {
		name string
		data []byte
	}

	dummyData := []byte("TEST")

	testTable := []struct {
		name              string
		repoConfig        string
		files             []file
		expectedFileNames []string
		expectedError     bool
	}{
		{
			name:              "External Fetch empty repo",
			repoConfig:        "",
			files:             []file{},
			expectedFileNames: []string{"override1", "override2", "override3"},
			expectedError:     false,
		},
		{
			name:       "Default config - Additional sub-folders",
			repoConfig: "",
			files: []file{{
				name: ".woodpecker/test.yml",
				data: dummyData,
			}, {
				name: ".woodpecker/sub-folder/config.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{"override1", "override2", "override3"},
			expectedError:     false,
		},
		{
			name:       "Fetch empty",
			repoConfig: " ",
			files: []file{{
				name: ".woodpecker/.keep",
				data: dummyData,
			}, {
				name: ".woodpecker.yml",
				data: nil,
			}, {
				name: ".woodpecker.yaml",
				data: dummyData,
			}},
			expectedFileNames: []string{},
			expectedError:     true,
		},
		{
			name:       "Use old config",
			repoConfig: ".my-ci-folder/",
			files: []file{{
				name: ".woodpecker/test.yml",
				data: dummyData,
			}, {
				name: ".woodpecker.yml",
				data: dummyData,
			}, {
				name: ".woodpecker.yaml",
				data: dummyData,
			}, {
				name: ".my-ci-folder/test.yml",
				data: dummyData,
			}},
			expectedFileNames: []string{
				".my-ci-folder/test.yml",
			},
			expectedError: false,
		},
	}

	pubEd25519Key, privEd25519Key, err := ed25519.GenerateKey(rand.Reader)
	if err != nil {
		t.Fatal("can't generate ed25519 key pair")
	}

	fixtureHandler := func(w http.ResponseWriter, r *http.Request) {
		// check signature
		pubKeyID := "woodpecker-ci-plugins"

		keystore := httpsig.NewMemoryKeyStore()
		keystore.SetKey(pubKeyID, pubEd25519Key)

		verifier := httpsig.NewVerifier(keystore)
		verifier.SetRequiredHeaders([]string{"(request-target)", "date"})

		keyID, err := verifier.Verify(r)
		if err != nil {
			http.Error(w, "Invalid signature", http.StatusBadRequest)
			return
		}

		if keyID != pubKeyID {
			http.Error(w, "Used wrong key", http.StatusBadRequest)
			return
		}

		type config struct {
			Name string `json:"name"`
			Data string `json:"data"`
		}

		type incoming struct {
			Repo          *model.Repo     `json:"repo"`
			Build         *model.Pipeline `json:"pipeline"`
			Configuration []*config       `json:"config"`
		}

		var req incoming
		body, err := io.ReadAll(r.Body)
		if err != nil {
			http.Error(w, "can't read body", http.StatusBadRequest)
			return
		}
		err = json.Unmarshal(body, &req)
		if err != nil {
			http.Error(w, "Failed to parse JSON"+err.Error(), http.StatusBadRequest)
			return
		}

		if req.Repo.Name == "Fetch empty" {
			w.WriteHeader(404)
			return
		}

		if req.Repo.Name == "Use old config" {
			w.WriteHeader(204)
			return
		}

		fmt.Fprint(w, `{
			"configs": [
					{
							"name": "override1",
							"data": "some new pipelineconfig \n pipe, pipe, pipe"
					},
					{
							"name": "override2",
							"data": "some new pipelineconfig \n pipe, pipe, pipe"
					},
					{
							"name": "override3",
							"data": "some new pipelineconfig \n pipe, pipe, pipe"
					}
			]
}`)
	}

	ts := httptest.NewServer(http.HandlerFunc(fixtureHandler))
	defer ts.Close()
	configAPI := config.NewHTTP(ts.URL, privEd25519Key)

	for _, tt := range testTable {
		t.Run(tt.name, func(t *testing.T) {
			repo := &model.Repo{Owner: "laszlocph", Name: tt.name, Config: tt.repoConfig} // Using test name as repo name to provide different responses in mock server

			f := new(mocks.Forge)
			dirs := map[string][]*forge_types.FileMeta{}
			for _, file := range tt.files {
				f.On("File", mock.Anything, mock.Anything, mock.Anything, mock.Anything, file.name).Return(file.data, nil)
				path := filepath.Dir(file.name)
				if path != "." {
					dirs[path] = append(dirs[path], &forge_types.FileMeta{
						Name: file.name,
						Data: file.data,
					})
				}
			}

			for path, files := range dirs {
				f.On("Dir", mock.Anything, mock.Anything, mock.Anything, mock.Anything, path).Return(files, nil)
			}

			// if the previous mocks do not match return not found errors
			f.On("File", mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil, fmt.Errorf("file not found"))
			f.On("Dir", mock.Anything, mock.Anything, mock.Anything, mock.Anything, mock.Anything).Return(nil, fmt.Errorf("directory not found"))

			f.On("Netrc", mock.Anything, mock.Anything).Return(&model.Netrc{Machine: "mock", Login: "mock", Password: "mock"}, nil)

			configFetcher := forge.NewConfigFetcher(
				f,
				time.Second*3,
				configAPI,
				&model.User{Token: "xxx"},
				repo,
				&model.Pipeline{Commit: "89ab7b2d6bfb347144ac7c557e638ab402848fee"},
			)
			files, err := configFetcher.Fetch(context.Background())
			if tt.expectedError && err == nil {
				t.Fatal("expected an error")
			} else if !tt.expectedError && err != nil {
				t.Fatal("error fetching config:", err)
			}

			matchingFiles := make([]string, len(files))
			for i := range files {
				matchingFiles[i] = files[i].Name
			}
			assert.ElementsMatch(t, tt.expectedFileNames, matchingFiles, "expected some other pipeline files")
		})
	}
}