/*
 * 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"
	"os"
	"strings"
)

type taskDef struct {
	Deps   []string
	Links  []link
	Cmds   []command
	Macros []macro
	Envs   []env
}

type macro []string
type env []string

func (t *taskDef) process(taskName, srcDir, dstDir string, conf *config, flags int) error {
	handled, ok := conf.tasksHandled[taskName]
	if ok && handled {
		return nil
	}

	conf.tasksHandled[taskName] = true

	for _, depName := range t.Deps {
		depTask, ok := conf.Tasks[depName]
		if !ok {
			return fmt.Errorf("task dependency not found %s", depName)
		}

		if err := depTask.process(depName, srcDir, dstDir, conf, flags); err != nil {
			return err
		}
	}

	for _, envItems := range t.Envs {
		switch {
		case len(envItems) == 0:
			continue
		case len(envItems) == 1:
			os.Unsetenv(envItems[0])
		case len(envItems) == 2:
			os.Setenv(envItems[0], envItems[1])
		default:
			os.Setenv(envItems[0], strings.Join(envItems[1:], ","))
		}
	}

	if flags&flagNoMacro == 0 {
		for _, macroItems := range t.Macros {
			if len(macroItems) == 0 {
				continue
			}

			macroName := macroItems[0]
			macroParams := macroItems[1:]

			depMacro, ok := conf.Macros[macroName]
			if !ok {
				return fmt.Errorf("macro dependency not found %s", macroName)
			}

			if err := depMacro.process(dstDir, macroParams, flags); err != nil {
				return err
			}
		}
	}

	if flags&flagNoLink == 0 {
		for _, currLink := range t.Links {
			if err := currLink.process(srcDir, dstDir, flags); err != nil {
				return err
			}
		}
	}

	if flags&flagNoCmd == 0 {
		for _, currCmd := range t.Cmds {
			if err := currCmd.process(dstDir, flags); err != nil {
				return err
			}
		}
	}

	return nil
}