package cbz

import (
	"CBZOptimizer/packer"
	"archive/zip"
	"bufio"
	"bytes"
	"fmt"
	"github.com/araddon/dateparse"
	"io"
	"path/filepath"
	"strings"
)

func LoadChapter(filePath string) (*packer.Chapter, error) {
	// Open the .cbz file
	r, err := zip.OpenReader(filePath)
	if err != nil {
		return nil, fmt.Errorf("failed to open .cbz file: %w", err)
	}
	defer r.Close()

	chapter := &packer.Chapter{
		FilePath: filePath,
	}

	for _, f := range r.File {
		if f.FileInfo().IsDir() {
			continue
		}
		// Open the file inside the zip
		rc, err := f.Open()
		if err != nil {
			return nil, fmt.Errorf("failed to open file inside .cbz: %w", err)
		}

		// Determine the file extension
		ext := strings.ToLower(filepath.Ext(f.Name))

		if ext == ".xml" && strings.ToLower(filepath.Base(f.Name)) == "comicinfo.xml" {
			// Read the ComicInfo.xml file content
			xmlContent, err := io.ReadAll(rc)
			if err != nil {
				rc.Close()
				return nil, fmt.Errorf("failed to read ComicInfo.xml content: %w", err)
			}
			chapter.ComicInfoXml = string(xmlContent)
		} else if ext == ".txt" && strings.ToLower(filepath.Base(f.Name)) == "converted.txt" {
			textContent, err := io.ReadAll(rc)
			if err != nil {
				rc.Close()
				return nil, fmt.Errorf("failed to read Converted.xml content: %w", err)
			}
			scanner := bufio.NewScanner(bytes.NewReader(textContent))
			if scanner.Scan() {
				convertedTime := scanner.Text()
				chapter.ConvertedTime, err = dateparse.ParseAny(convertedTime)
				if err != nil {
					rc.Close()
					return nil, fmt.Errorf("failed to parse converted time: %w", err)
				}
				chapter.IsConverted = true
			}
		} else {
			// Read the file contents for page
			buf := new(bytes.Buffer)
			_, err = io.Copy(buf, rc)
			if err != nil {
				rc.Close()
				return nil, fmt.Errorf("failed to read file contents: %w", err)
			}

			// Create a new Page object
			page := &packer.Page{
				Index:      uint16(len(chapter.Pages)), // Simple index based on order
				Extension:  ext,
				Size:       uint64(buf.Len()),
				Contents:   buf,
				IsSplitted: false,
			}

			// Add the page to the chapter
			chapter.Pages = append(chapter.Pages, page)
		}
		rc.Close()

	}

	return chapter, nil
}