package books

import (
	"fmt"
	"hugo-medialog/utils"
	"os"
	"path/filepath"

	"gopkg.in/yaml.v2"
)

func LoadBooks() ([]Book, error) {
	booksFile := os.Getenv("OBSIDIAN_BOOKS_FILE")
	fileData, err := os.ReadFile(booksFile)
	if err != nil {
		return nil, err
	}

	var books []Book
	err = yaml.Unmarshal(fileData, &books)
	if err != nil {
		return nil, err
	}

	return books, nil
}

func ProcessBooks(books []Book, update bool) error {
	fmt.Printf(" B O O K S\n")
	utils.Sep()
	for _, book := range books {
		fmt.Printf("Title: %s\n", book.Title)

		// If we're updating, the process is a bit different
		if update || !book.New {
			outputDir := os.Getenv("MARKDOWN_OUTPUT_BOOKS_DIR")
			mdFilePath := filepath.Join(outputDir, fmt.Sprintf("%s.md", utils.Sluggify(book.Title)))
			frontmatter, content, err := utils.LoadMarkdown(mdFilePath)
			if err != nil {
				fmt.Printf(" ! Error loading markdown frontmatter for book %s: %v\n", book.Title, err)
				continue
			}
			updatedFrontmatter := updateFrontmatterWithYAML(frontmatter, book)
			err = utils.SaveUpdatedMarkdown(mdFilePath, updatedFrontmatter, content)
			if err != nil {
				fmt.Printf(" ! Error saving updated markdown for book %s: %v\n", book.Title, err)
				continue
			}
			// We want to continue the loop here, in update's cases we don't
			// want to do any api calls for info nor for images
			continue
		}

		// If we dont have ID, search movie by Title and get the ID
		if book.ID == "" {
			err := SearchBookByTitle(book.Title, &book)
			if err != nil {
				fmt.Printf(" ! Error searching book by title %s: %s\n", book.Title, err)
				continue
			}
		}
		book.Slug = utils.Sluggify(book.Title)

		// Now we need to get the image
		imageURL := getBookCoverByTitle(book.Title)
		if imageURL != "" {
			err := DownloadImage(imageURL, book.Slug)
			if err != nil {
				fmt.Printf(" ! Error downloading %s: %s\n", imageURL, err)
			}
		}
		book.Image = fmt.Sprintf("%s.jpg", book.Slug)

		err := generateBookMarkdown(book)
		if err != nil {
			return err
		}

		utils.Sep()
	}
	return nil
}

func generateBookMarkdown(book Book) error {
	templatePath := filepath.Join(os.Getenv("TEMPLATES_DIR"), "book.md.tpl")
	outputDir := os.Getenv("MARKDOWN_OUTPUT_BOOKS_DIR")
	if err := utils.CreateDirIfNotExists(outputDir); err != nil {
		return err
	}
	outputPath := filepath.Join(outputDir, fmt.Sprintf("%s.md", book.Slug))

	data := map[string]interface{}{
		"Title":    book.Title,
		"Author":   book.Author,
		"Link":     book.Link,
		"Subtitle": book.Year,
		"Year":     book.Year,
		"Rate":     book.Rate,
		"Pages":    book.Pages,
		"Progress": book.Progress,
		"Image":    book.Image,
		"Date":     book.Date,
		"Tags":     "reading",
	}

	return utils.GenerateMarkdown(templatePath, outputPath, data)
}

// Helper function to update only YAML fields that exist in both the frontmatter and YAML data
func updateFrontmatterWithYAML(frontmatter utils.FrontMatter, book Book) utils.FrontMatter {
	frontmatter.Progress = book.Progress
	frontmatter.Date = book.Date
	frontmatter.Rate = book.Rate
	return frontmatter
}