package migration

import (
	"database/sql"
	"federated.computer/wp-sync-slowtwitch/services/slowtwitch"
	"federated.computer/wp-sync-slowtwitch/services/wordpress"
	"fmt"
	"slices"
	"strconv"
	"strings"
	"sync"
)

type MigratePosts struct {
	SlowtwitchDatabase *sql.DB
	ResultsDatabase    *sql.DB
	WordpressBaseUrl   string
	WordpressUser      string
	WordpressPassword  string
}

func (migration MigratePosts) Execute() []PostResult {
	slowtwitchPostIds, err := slowtwitch.GetAllPostIds(migration.SlowtwitchDatabase)
	if err != nil {
		panic("Could not migrate posts: " + err.Error())
	}
	migratedPostIds, err := GetAllMigratedPostIds(migration.ResultsDatabase)
	if err != nil {
		panic("Could not migrate posts:" + err.Error())
	}
	slowtwitchPostIdsForMigration := getPostIdsThatNeedMigration(slowtwitchPostIds, migratedPostIds)

	//get wordpress tag data, there are only 3
	tags := []string{"swim", "bike", "run"}
	wpTagData, wpTagErr := wordpress.GetTags(tags, migration.WordpressBaseUrl, migration.WordpressUser, migration.WordpressPassword)
	if wpTagErr != nil {
		panic("Could not migrate posts due to tags not found:" + wpTagErr.Error())
	}

	var postResults []PostResult
	batchSize := 5
	workInputChannel := make(chan int)
	workOutputChannel := make(chan PostResult)
	doneChannel := make(chan bool)
	defer close(doneChannel)
	var wg sync.WaitGroup
	wg.Add(len(slowtwitchPostIdsForMigration))

	for i := 0; i < batchSize; i++ {
		go func() {
			for {
				select {
				case <-doneChannel:
					return
				case postId, ok := <-workInputChannel:
					if ok {
						result := createPost(postId, migration, wpTagData)
						workOutputChannel <- result
					} else {
						return
					}
				}
			}
		}()
	}

	go func() {
		defer close(workInputChannel)

		for _, postId := range slowtwitchPostIdsForMigration {
			select {
			case <-doneChannel:
				return
			case workInputChannel <- postId:
			}
		}
	}()

	go func() {
		defer close(workOutputChannel)

		for {
			select {
			case <-doneChannel:
				return
			case postResult, ok := <-workOutputChannel:
				if ok {
					postResults = append(postResults, postResult)
					wg.Done()
				} else {
					return
				}
			}
		}
	}()

	wg.Wait()
	doneChannel <- true

	updatePostRelationships(postResults, migration)

	return postResults
}

func createPost(postId int, migration MigratePosts, wpTagData []wordpress.TagData) PostResult {
	fmt.Println("Creating post " + strconv.Itoa(postId))
	errorMessage := ""
	//migrate
	postBase, postBaseErr := slowtwitch.GetPostBase(postId, migration.SlowtwitchDatabase)

	if postBaseErr != nil {
		errorMessage = errorMessage + postBaseErr.Error()
		failedPostResult := createPostFailureResult(postId, errorMessage, migration.ResultsDatabase)
		return failedPostResult
	}

	createWordpressPost := wordpress.CreatePost{
		Title:   postBase.Title,
		Excerpt: postBase.Description,
		Status:  "publish",
	}
	fmt.Println("Checking date: " + strconv.Itoa(postId))
	if postBase.DatePublished.Valid {
		t := postBase.DatePublished.Time
		timeString := fmt.Sprintf("%d-%02d-%02dT%02d:%02d:%02d",
			t.Year(), t.Month(), t.Day(),
			t.Hour(), t.Minute(), t.Second())
		createWordpressPost.Date = timeString
	} else {
		errorMessage = errorMessage + "Invalid Date Published"
		failedPostResult := createPostFailureResult(postId, errorMessage, migration.ResultsDatabase)
		return failedPostResult
	}
	fmt.Println("Checking tags: " + strconv.Itoa(postId))
	for _, tag := range wpTagData {
		if postBase.Bike == true && tag.Name == "bike" {
			createWordpressPost.Tags = append(createWordpressPost.Tags, tag.Id)
		}
		if postBase.Swim == true && tag.Name == "swim" {
			createWordpressPost.Tags = append(createWordpressPost.Tags, tag.Id)
		}
		if postBase.Run == true && tag.Name == "run" {
			createWordpressPost.Tags = append(createWordpressPost.Tags, tag.Id)
		}
	}
	fmt.Println("Checking categories: " + strconv.Itoa(postId))
	var wordPressCategoryIds []int
	var firstCategoryResult CategoryResult
	for _, slowtwitchCategoryId := range postBase.CategoryIds {
		categoryResult, err := GetSlowtwitchCategoryResult(slowtwitchCategoryId, migration.ResultsDatabase)
		if err != nil {
			errorMessage = errorMessage + err.Error()
			failedPostResult := createPostFailureResult(postId, errorMessage, migration.ResultsDatabase)
			return failedPostResult
		}
		wordPressCategoryIds = append(wordPressCategoryIds, categoryResult.WordpressId)
		firstCategoryResult = categoryResult
	}

	if len(wordPressCategoryIds) == 0 {
		errorMessage = "This post has no categories and is broken on the production site."
		failedPostResult := createPostFailureResult(postId, errorMessage, migration.ResultsDatabase)
		return failedPostResult
	}

	createWordpressPost.Categories = wordPressCategoryIds
	//Get Author ID
	editor, findEditorErr := GetEditor(postBase.Author, postBase.AuthorEmail, migration.ResultsDatabase)
	fmt.Println("Finding editor: " + strconv.Itoa(postId))
	if findEditorErr != nil {
		editor, catchAllEditorErr := GetEditor("admin", "slowman2@slowtwitch.com", migration.ResultsDatabase)

		if catchAllEditorErr != nil {
			errorMessage = errorMessage + findEditorErr.Error()
			failedPostResult := createPostFailureResult(postId, errorMessage, migration.ResultsDatabase)
			return failedPostResult
		}
		createWordpressPost.Author = editor.WordpressId
	}
	createWordpressPost.Author = editor.WordpressId
	//Get old link
	oldLink := strings.ReplaceAll(firstCategoryResult.OldUrl, "index.html", "") + slowtwitch.ConvertPostTitleToPath(postBase.Title, postBase.Id)
	linkStatus := slowtwitch.GetPageStatus(oldLink)
	fmt.Println("Checking link: " + strconv.Itoa(postId))
	if linkStatus == 404 {
		errorMessage = errorMessage + "Page not found on Slowtwitch"
		failedPostResult := createPostFailureResult(postId, errorMessage, migration.ResultsDatabase)
		return failedPostResult
	}

	//Get page, parse out post data and images
	//Upload images to wordpress, swap out with new image urls
	//Submit
	fmt.Println("Checking images: " + strconv.Itoa(postId))
	imagePaths, html, retreiveHtmlErr := slowtwitch.GetImagesAndPostHtml(oldLink)
	if retreiveHtmlErr != nil {
		errorMessage = errorMessage + retreiveHtmlErr.Error()
		failedPostResult := createPostFailureResult(postId, errorMessage, migration.ResultsDatabase)
		return failedPostResult
	}
	//Create images from the image paths
	var imageResults []ImageResult

	for i, imagePath := range imagePaths {
		//construct URL
		imageUrl := "https://www.slowtwitch.com" + imagePath
		createWordpressImage := wordpress.CreateImage{
			Url: imageUrl,
		}
		//submit image
		wordpressImage, wordpressImageErr := createWordpressImage.Execute(migration.WordpressBaseUrl, migration.WordpressUser, migration.WordpressPassword)

		if wordpressImageErr != nil {
			errorMessage = errorMessage + wordpressImageErr.Error()
			imageFailureResult := ImageResult{
				OldUrl:      imageUrl,
				NewUrl:      "",
				WordpressId: 0,
				IsSuccess:   false,
			}
			imageResults = append(imageResults, imageFailureResult)
			continue
		}
		//first photo is the featured photo
		if i == 0 {
			createWordpressPost.FeaturedMedia = wordpressImage.Id
		}
		//begin process of recording result
		imageResult := ImageResult{
			OldUrl:      imageUrl,
			NewUrl:      wordpressImage.Link,
			WordpressId: wordpressImage.Id,
			IsSuccess:   true,
		}
		imageResults = append(imageResults, imageResult)
		//replace old links with new in post html
		newImagePath := "/wp-content/uploads/" + wordpressImage.MediaDetails.File
		html = strings.ReplaceAll(html, imagePath, newImagePath)
		//create redirect
		imageRedirect := wordpress.CreateRedirect{
			Title:      postBase.Title + "image-" + string((i + 1)),
			Url:        imagePath,
			MatchType:  "page",
			ActionType: "url",
			ActionCode: 301,
			GroupId:    1,
			ActionData: wordpress.ActionData{
				Url: "/" + wordpressImage.Slug,
			},
		}

		_, imageRedirectErr := imageRedirect.Execute(migration.WordpressBaseUrl, migration.WordpressUser, migration.WordpressPassword)

		if imageRedirectErr != nil {
			fmt.Println("Failed to create image redirect:", imageUrl, ":", imageRedirectErr.Error())
		}
	}
	fmt.Println("Checking html: " + strconv.Itoa(postId))
	createWordpressPost.Content = html
	post, createWordpressPostErr := createWordpressPost.Execute(migration.WordpressBaseUrl, migration.WordpressUser, migration.WordpressPassword)
	if createWordpressPostErr != nil {
		errorMessage = errorMessage + createWordpressPostErr.Error()
		postFailureResult := createPostFailureResult(postId, errorMessage, migration.ResultsDatabase)
		return postFailureResult
	}
	//set up post result here to create
	//truncate error message for db
	if len(errorMessage) > 1450 {
		errorMessage = errorMessage[:1450]
	}

	postResult := PostResult{
		SlowtwitchId: postId,
		WordpressId:  post.Id,
		OldUrl:       oldLink,
		OldUrlStatus: linkStatus,
		NewUrl:       post.Link,
		IsSuccess:    true,
		ErrorMessage: errorMessage,
	}
	fmt.Println("Recording result: " + strconv.Itoa(postId))
	postResultId, createPostResultErr := CreatePostResult(postResult, migration.ResultsDatabase)
	if createPostResultErr != nil {
		fmt.Println("Could not record post result for Slowtwitch post:" + strconv.Itoa(postId) + createPostResultErr.Error())
	}
	for _, imageResult := range imageResults {
		imageResult.PostId = postResultId
		createImageResultErr := CreateImageResult(imageResult, migration.ResultsDatabase)
		if createImageResultErr != nil {
			fmt.Println("Error recording image result")
		}
	}
	oldPath := strings.ReplaceAll(oldLink, "https://www.slowtwitch.com", "")
	postRedirect := wordpress.CreateRedirect{
		Title:      "Article Redirect" + postBase.Title,
		Url:        oldPath,
		MatchType:  "page",
		ActionType: "url",
		ActionCode: 301,
		GroupId:    1,
		ActionData: wordpress.ActionData{
			Url: "/" + strings.ReplaceAll(postResult.NewUrl, migration.WordpressBaseUrl, ""),
		},
	}
	_, postRedirectErr := postRedirect.Execute(migration.WordpressBaseUrl, migration.WordpressUser, migration.WordpressPassword)
	if postRedirectErr != nil {
		fmt.Println("Error creating redirect for", postId, ":"+postRedirectErr.Error())
	}
	fmt.Println("Successfully created post and result for", postId)
	updateAcfImages(imageResults, post.Id, migration.WordpressBaseUrl, migration.WordpressUser, migration.WordpressPassword)
	return postResult
}

func updatePostRelationships(postResults []PostResult, migration MigratePosts) {
	fmt.Println("Updating post relationships")
	totalPostResults := len(postResults)
	batchSize := 5
	postResultWorkInput := make(chan PostResult)
	doneChannel := make(chan bool)
	defer close(doneChannel)
	//Set up a wait group to wait for the input channel to close after execution
	var wg sync.WaitGroup
	wg.Add(totalPostResults + 1)

	//Launch go routines that will read from the input channel,
	//maxed out at the batch size
	for i := 0; i < batchSize; i++ {
		go func() {
			for {
				select {
				case <-doneChannel:
					return
				case result, ok := <-postResultWorkInput:
					if ok {
						updatePostRelationship(result, migration)
						wg.Done()
					} else {
						return
					}
				}
			}
		}()
	}

	//Launch an unbuffered channel that will fill the channel with work
	//as the workers take work from the channel. This will be blocked while
	//any task is waiting to be picked up from the channel
	go func() {
		//defer close(postResultWorkInput)

		for _, result := range postResults {
			select {
			case <-doneChannel:
				return
			case postResultWorkInput <- result:
			}
		}
		wg.Done()
	}()

	wg.Wait()
	doneChannel <- true
	fmt.Println("Done with post relationships")
}

func updatePostRelationship(postResult PostResult, migration MigratePosts) bool {
	if postResult.IsSuccess {
		var relatedWordpressIds []int

		relatedSlowtwitchIds, slowtwitchIdsErr := slowtwitch.GetRelatedArticleIds(postResult.SlowtwitchId, migration.SlowtwitchDatabase)

		if slowtwitchIdsErr != nil || len(relatedSlowtwitchIds) == 0 {
			return false
		}
		for _, slowtwitchRelatedId := range relatedSlowtwitchIds {
			wordpressRelatedId, wordpressIdErr := GetWordpressPostIdBySlowtwitchPostId(slowtwitchRelatedId, migration.ResultsDatabase)
			if wordpressIdErr != nil {
				return false
			}
			relatedWordpressIds = append(relatedWordpressIds, wordpressRelatedId)
		}

		if len(relatedWordpressIds) > 0 {
			fmt.Println("Updating post in WP", postResult.WordpressId)
			updateWordpressRelatedPosts := wordpress.UpdateAcfRelatedPosts{
				Acf: wordpress.AcfRelatedPosts{
					PostIds: relatedWordpressIds,
				},
			}
			updateRelatedPostErr := updateWordpressRelatedPosts.Execute(migration.WordpressBaseUrl, migration.WordpressUser, migration.WordpressPassword, postResult.WordpressId)
			if updateRelatedPostErr != nil {
				fmt.Println("Error updating wordpressRelatedPosts", updateRelatedPostErr.Error())
			} else {
				return true
			}
		}
	}
	return false
}

func getPostIdsThatNeedMigration(slowtwitchPostIds, migratedPostIds []int) []int {
	var output []int

	for _, slowtwitchPostId := range slowtwitchPostIds {
		hasId := slices.Contains(migratedPostIds, slowtwitchPostId)
		if hasId == false {
			output = append(output, slowtwitchPostId)
		}
	}

	return output
}

func createPostFailureResult(slowtwitchId int, errorMessage string, migrationDb *sql.DB) PostResult {
	fmt.Println("Error creating post: ", slowtwitchId, ":", errorMessage)

	postResult := PostResult{
		SlowtwitchId: slowtwitchId,
		WordpressId:  0,
		OldUrl:       "",
		OldUrlStatus: 0,
		NewUrl:       "",
		IsSuccess:    false,
		ErrorMessage: errorMessage,
	}

	_, err := CreatePostResult(postResult, migrationDb)

	if err != nil {
		fmt.Println("Failed to create failure result: ", err)
	}
	return postResult
}

func createImageFailureResult(url string, resultsDatabase *sql.DB) {
	fmt.Println("Error creating image failure result: ", url)

	imageResult := ImageResult{
		OldUrl:      url,
		NewUrl:      "",
		WordpressId: 0,
		IsSuccess:   false,
	}

	err := CreateImageResult(imageResult, resultsDatabase)
	if err != nil {
		fmt.Println("Failed to create failure result: ", err)
	}
}

func getSuccessfulWordpressImageIds(imageResults []ImageResult) []int {
	var output []int

	for _, imageResult := range imageResults {
		if imageResult.WordpressId > 0 && imageResult.IsSuccess {
			output = append(output, imageResult.WordpressId)
		}
	}

	return output
}

func updateAcfImages(imageResults []ImageResult, postId int, baseUrl, user, pass string) {
	if len(imageResults) > 0 {
		wordpressImageIds := getSuccessfulWordpressImageIds(imageResults)

		if len(wordpressImageIds) > 0 {
			updateAcfImages := wordpress.UpdateAcfImages{
				Acf: wordpress.AcfImages{
					PostImages: wordpressImageIds,
				},
			}
			acfImagesErr := updateAcfImages.Execute(baseUrl, user, pass, postId)

			if acfImagesErr != nil {
				fmt.Println("Error updating acf images for post", postId, ":", acfImagesErr.Error())
			}
		}
	}
}