package main

import (
	"flag"
	"fmt"
	"log"
)

// manage debugging messages

const debug debugging = true

type debugging bool

func (d debugging) log(format string, args ...interface{}) {
	if d {
		log.Printf(format, args...)
	}
}

///////////

var conf_file = flag.String("c", "./scorsh.cfg", "Configuration file for SCORSH")

func SCORSHerr(err int) error {

	var err_str string

	switch err {
	case SCORSH_ERR_NO_FILE:
		err_str = "Invalid file name"
	case SCORSH_ERR_KEYRING:
		err_str = "Invalid keyring"
	case SCORSH_ERR_NO_REPO:
		err_str = "Invalid repository"
	case SCORSH_ERR_NO_COMMIT:
		err_str = "Invalid commit ID"
	case SCORSH_ERR_SIGNATURE:
		err_str = "Invalid signature"
	default:
		err_str = "Generic Error"
	}
	return fmt.Errorf("%s", err_str)

}

func FindMatchingWorkers(master *SCORSHmaster, msg *SCORSHmsg) []*SCORSHworker {

	var ret []*SCORSHworker

	for idx, w := range master.Workers {
		if w.Matches(msg.Repo, msg.Branch) {
			debug.log("--- Worker: %s matches %s:%s\n", w.Name, msg.Repo, msg.Branch)
			ret = append(ret, &(master.Workers[idx]))
		}
	}
	return ret
}

func Master(master *SCORSHmaster) {

	// master main loop:

	var matching_workers []*SCORSHworker
	var push_msg SCORSHmsg

	matching_workers = make([]*SCORSHworker, len(master.Workers))

	log.Println("[master] Master started ")

	for {
		select {
		// - receive stuff from the spooler
		case push_msg = <-master.Spooler:

			debug.log("[master] received message: %s\n", push_msg)

			// - lookup the repos map for matching workers
			matching_workers = FindMatchingWorkers(master, &push_msg)
			debug.log("[master] matching workers: %s\n", matching_workers)

			// add the message to PendingMsg
			//...
			// - dispatch the message to all the matching workers
			for _, w := range matching_workers {
				// increase the counter associated to the message
				w.MsgChan <- push_msg
			}
		}
	}
}

func InitMaster() *SCORSHmaster {

	master := ReadGlobalConfig(*conf_file)

	master.Repos = make(map[string][]*SCORSHworker)
	master.WorkingMsg = make(map[string]int)
	// This is the mutex-channel on which we receive acks from workers
	master.StatusChan = make(chan SCORSHmsg, 1)
	master.Spooler = make(chan SCORSHmsg, 1)

	err_workers := StartWorkers(master)
	if err_workers != nil {
		log.Fatal("Error starting workers: ", err_workers)
	} else {
		log.Println("Workers started correctly")
	}
	err_spooler := StartSpooler(master)
	if err_spooler != nil {
		log.Fatal("Error starting spooler: ", err_spooler)
	}
	return master

}

func main() {

	flag.Parse()

	master := InitMaster()

	go Master(master)

	<-master.StatusChan

}