// Copyright © 2016 Jip J. Dekker <jip@dekker.li>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package settings

import (
	"encoding/json"
	"io/ioutil"
	"path/filepath"

	"github.com/jjdekker/ponder/helpers"
)

// Settings provides a structure to interact with the settings
// of a Ponder library
type Settings struct {
	Name                 string   // Name of the Ponder library
	Author               string   // Author of the Ponder library
	IgnoreDirs           []string // Directories to be ignored on search
	LilypondIncludes     []string // Directories to be included when running the lilypond compiler
	OutputDir            string   // Directory in which all complete file are stored
	HideUncategorized    bool     // Hide scores without a category from the book
	UncategorizedChapter string   // Name of the chapter with uncategorized scores
	BookPackagesTempl    string   // Override for the partial book template declaring packages
	BookTitleTempl       string   // Override for the partial book template creating the title page
	BookCategoryTempl    string   // Override for the partial book template creating category pages
	BookScoreTempl       string   // Override for the partial book template placing scores
	LatexResources       []string // Files to be copied to compile the book template
	KeepBookTemplate     bool     // Leave the LaTeX source for the book in the output directory
	FlatOutputDir        bool     // Keep all output file in a flat output directory
	DefaultCategories    []string // Categories included in the book by default
	EnablePointAndClick  bool     // Enable Lilypond's Point and Click functionality
}

// FromFile reads a settings file in json format and returns the Settings struct
func FromFile(path string) (*Settings, error) {
	data, err := ioutil.ReadFile(path)
	if err != nil {
		return nil, err
	}

	var s Settings
	err = json.Unmarshal(data, &s)
	if err != nil {
		return nil, err
	}
	s.AbsolutePaths(filepath.Dir(path))
	return &s, nil
}

// AbsolutePaths makes all paths in settings absolute using the given
// absolute root
func (s *Settings) AbsolutePaths(root string) {
	for i := range s.IgnoreDirs {
		s.IgnoreDirs[i] = helpers.AbsolutePath(s.IgnoreDirs[i], root)
	}
	for i := range s.LilypondIncludes {
		s.LilypondIncludes[i] = helpers.AbsolutePath(s.LilypondIncludes[i], root)
	}
	for i := range s.LatexResources {
		s.LatexResources[i] = helpers.AbsolutePath(s.LatexResources[i], root)
	}
	s.OutputDir = helpers.AbsolutePath(s.OutputDir, root)
}