// 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 config_test

import (
	"context"
	"fmt"
	"path/filepath"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"

	"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/services/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).Once().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).Once().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 := config.NewForge(
				time.Second*3,
				3,
			)
			files, err := configFetcher.Fetch(
				context.Background(),
				f,
				&model.User{AccessToken: "xxx"},
				repo,
				&model.Pipeline{Commit: "89ab7b2d6bfb347144ac7c557e638ab402848fee"},
				nil,
				false,
			)
			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")
		})
	}
}