package main

import (
	"bufio"
	"compress/gzip"
	"d1pkgweb/deb822"
	"fmt"
	"net/http"
	"os"
)

func processSuite(suiteCfg SuiteCfg, relCfg ReleaseCfg, baseDir string, result chan error) {

	relName := relCfg.Release
	suiteName := suiteCfg.Name
	for _, component := range suiteCfg.Components { // For each component in the suite
		fullURL := fmt.Sprintf("%s/%s", relCfg.RepoURL, component.URL)
		fmt.Fprintf(os.Stderr, "Processing: %s\n", fullURL)
		f, err := http.Get(fullURL)
		if err != nil {
			fmt.Fprintf(os.Stderr, "...Ignoring %s\n", fullURL)
		} else {
			uncompressed, err := gzip.NewReader(f.Body)
			if err != nil {
				fmt.Fprintf(os.Stderr, "error uncompressing %s\n", fullURL)
				continue
			}
			r := bufio.NewScanner(uncompressed)
			for s, err := deb822.ScanStanza(r); s["Package"] != ""; s, err = deb822.ScanStanza(r) {
				if err == nil {
					deb822.Stanza2HtmlPage(s, pkgTempl, baseDir, relName, suiteName, component.Name)
				} else {
					fmt.Printf("error: %s\n", err)
				}
			}
		}
	}
	result <- nil
}

func processRelease(relCfg ReleaseCfg, baseDir string, result chan error) {

	c := make(chan error)
	numWorkers := 0

	for _, suiteCfg := range relCfg.Suites { // For each suite of the release
		numWorkers++
		go processSuite(suiteCfg, relCfg, baseDir, c)
	}

	select {
	case e := <-c:
		numWorkers--
		if numWorkers == 0 {
			result <- e
			return
		}
	}
	result <- nil
	return
}

func main() {

	args := os.Args

	if len(args) < 2 {
		fmt.Printf("Usage: %s <filein>\n", args[0])
		return
	}

	confFile := args[1]
	conf := readConfig(confFile)

	c := make(chan error)
	numWorkers := 0

	for _, relCfg := range conf.PkgSets { // For each release...
		numWorkers++
		go processRelease(relCfg, ".", c)
	}
	var err = make([]error, numWorkers)

	select {
	case e := <-c:
		numWorkers--
		err[numWorkers] = e
		if numWorkers == 0 {
			fmt.Fprintf(os.Stderr, "Exiting from main....")
			os.Exit(0)
		}
	}
}