package spm

import (
	"bufio"
	"io"
	"net/http"
	"os"
	"strings"
)

const appIndexURL = "https://downloads.sourceforge.net/project/spitfire-browser/APPINDEX"

func DownloadAppIndex(dest string) error {
	UpdateProgress(0, "Downloading APPINDEX")
	resp, err := http.Get(appIndexURL)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	out, err := os.Create(dest)
	if err != nil {
		return err
	}
	defer out.Close()

	totalSize := resp.ContentLength
	var downloaded int64

	// Track progress as bytes are downloaded
	buf := make([]byte, 1024)
	for {
		n, err := resp.Body.Read(buf)
		if n > 0 {
			downloaded += int64(n)
			percentage := int(float64(downloaded) / float64(totalSize) * 100)
			UpdateProgress(percentage, "Downloading APPINDEX")
			if _, err := out.Write(buf[:n]); err != nil {
				return err
			}
		}
		if err == io.EOF {
			break
		}
		if err != nil {
			return err
		}
	}

	UpdateProgress(100, "APPINDEX downloaded")
	return nil
}

type AppIndexEntry struct {
	Name        string
	Version     string
	Release     string
	Arch        string
	OS          string
	DownloadURL string
}

func ParseAppIndex(filePath string) ([]AppIndexEntry, error) {
	file, err := os.Open(filePath)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	var entries []AppIndexEntry
	scanner := bufio.NewScanner(file)
	entry := AppIndexEntry{}

	for scanner.Scan() {
		line := scanner.Text()
		if strings.HasPrefix(line, "C:") {
			if entry.Name != "" {
				entries = append(entries, entry)
				entry = AppIndexEntry{}
			}
		}
		parts := strings.SplitN(line, ":", 2)
		if len(parts) < 2 {
			continue
		}

		switch parts[0] {
		case "P":
			entry.Name = parts[1]
		case "R":
			entry.Release = parts[1]
		case "V":
			entry.Version = parts[1]
		case "A":
			entry.Arch = parts[1]
		case "p":
			entry.OS = parts[1]
		case "d":
			entry.DownloadURL = parts[1]
		}
	}

	if entry.Name != "" {
		entries = append(entries, entry)
	}

	return entries, scanner.Err()
}