package fastmirror

import (
	"log"
	"runtime"
)

func CLIEntry() {
	log.Println("Starting Fastmirror CLI")

	if runtime.GOOS != "linux" {
		log.Fatal("This program is only for Linux")
	}
	if err := isUbuntu(); err != nil {
		log.Fatal(err)
	}

	sourcesFilePath, err := findSourcesFilePath()
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Found sources file: %s", sourcesFilePath)

	// Extract suites from the existing sources file
	suites, err := extractSuites(sourcesFilePath)
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Extracted suites: %v", suites)

	// Create backup of the sources file
	if err := createBackup(sourcesFilePath); err != nil {
		log.Fatal(err)
	}

	oldMirrorURL, err := findMirrorURLInFile(sourcesFilePath)

	if err != nil {
		// redundant
		log.Fatalf("Failed to find mirror URL in file %s: %v", sourcesFilePath, err)
	}

	// Fetch and find the fastest mirror
	fastestMirrorURL, fastestTime, latencies, err := findFastestMirror(suites)
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("Fastest mirror: %s", fastestMirrorURL)

	// Display latency statistics
	displayLatencyStatistics(latencies, fastestMirrorURL, fastestTime)

	if err != nil {
		log.Fatalf("Failed to find mirror URL in file %s: %v", sourcesFilePath, err)
	}

	// Update sources file with the fastest mirror
	if err := updateSourcesFile(sourcesFilePath, oldMirrorURL, fastestMirrorURL); err != nil {
		log.Fatal(err)
	}
	log.Println("Fastmirror CLI finished successfully")
}