/*
 * Copyright (c) 2015 Alex Yatskov <alex@foosoft.net>
 * Author: Alex Yatskov <alex@foosoft.net>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package main

import "fmt"

type link []string

type task struct {
	Deps  []string
	Links []link
}

func (this *task) walk(conf *config, depFunc func(depTask *task) error, linkFunc func(currLink *link) error) error {
	for _, depName := range this.Deps {
		depTask, ok := conf.Tasks[depName]
		if !ok {
			return fmt.Errorf("Task dependency not found: '%s'", depName)
		}

		if err := depFunc(&depTask); err != nil {
			return err
		}
	}

	for _, currLink := range this.Links {
		if err := linkFunc(&currLink); err != nil {
			return err
		}
	}

	return nil
}

func (this *task) install(srcDir, dstDir string, conf *config, flags int) error {
	depWalker := func(depTask *task) error {
		return depTask.install(srcDir, dstDir, conf, flags)
	}

	linkWalker := func(currLink *link) error {
		return currLink.install(srcDir, dstDir, flags)
	}

	return this.walk(conf, depWalker, linkWalker)
}

func (this *task) uninstall(dstDir string, conf *config, flags int) error {
	depWalker := func(depTask *task) error {
		return depTask.uninstall(dstDir, conf, flags)
	}

	linkWalker := func(currLink *link) error {
		return currLink.uninstall(dstDir, flags)
	}

	return this.walk(conf, depWalker, linkWalker)
}