/*
goredo -- redo implementation on pure Go
Copyright (C) 2020 Sergey Matveev <stargrave@stargrave.org>

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, version 3 of the License.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package main

func isOkRun(err error) bool {
	if err == nil {
		return true
	}
	if err, ok := err.(RunErr); ok && err.Err == nil {
		trace(CRedo, "%s", err.Name())
		return true
	}
	trace(CErr, "%s", err)
	return false
}

func ifchange(tgts []string) (bool, error) {
	jsInit()
	defer jsAcquire("ifchange exiting")
	defer Jobs.Wait()
	errs := make(chan error, len(tgts))
	jobs := 0
	ok := true
	var err error
	for _, tgt := range tgts {
		var ood bool
		if Force {
			ood = true
		} else {
			ood, err = isOOD(Cwd, tgt, 0)
			if err != nil {
				return false, err
			}
		}
		if !ood {
			continue
		}
		if isSrc(Cwd, tgt) {
			trace(CDebug, "%s is source, not redoing", tgt)
			continue
		}
		if err = runScript(tgt, errs); err != nil {
			return false, err
		}
		if Force {
			// Sequentially run jobs
			err = <-errs
			Jobs.Wait()
			if isOkRun(err) {
				continue
			}
			return false, nil
		}
		jobs++
	}
	for i := 0; i < jobs; i++ {
		err = <-errs
		ok = ok && isOkRun(err)
	}
	return ok, nil
}