// Copyright 2017 Unknwon

//

// 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 ini

import (

	"bytes"

	"errors"

	"fmt"

	"io"

	"io/ioutil"

	"os"

	"strings"

	"sync"

)

type File struct {

	options     LoadOptions

	dataSources []dataSource

	// Should make things safe, but sometimes doesn't matter.

	BlockMode bool

	lock      sync.RWMutex

	// To keep data in order.

	sectionList []string

	// Actual data is stored here.

	NameMapper

	ValueMapper

}

// newFile initializes File object with given data sources.

func newFile(dataSources []dataSource, opts LoadOptions) *File {

	if len(opts.KeyValueDelimiters) == 0 {

		opts.KeyValueDelimiters = "=:"

	}

	return &File{

		BlockMode:   true,

		dataSources: dataSources,

		options:     opts,

	}

}

// Empty returns an empty file object.

	return f

}

// NewSection creates a new section.

func (f *File) NewSection(name string) (*Section, error) {

	if len(name) == 0 {

		name = strings.ToLower(name)

	}

	if f.BlockMode {

		f.lock.Lock()

		defer f.lock.Unlock()

	}

	}

	f.sectionList = append(f.sectionList, name)

}

// NewRawSection creates a new section with an unparseable body.

func (f *File) NewRawSection(name, body string) (*Section, error) {

	section, err := f.NewSection(name)

	if err != nil {

		return nil, err

	}

	section.isRawSection = true

	section.rawBody = body

	return section, nil

}

// NewSections creates a list of sections.

func (f *File) NewSections(names ...string) (err error) {

	for _, name := range names {

		if _, err = f.NewSection(name); err != nil {

			return err

		}

	}

	return nil

}

// GetSection returns section by given name.

func (f *File) GetSection(name string) (*Section, error) {

	if len(name) == 0 {

		name = DefaultSection

	}

		name = strings.ToLower(name)

	}

	if f.BlockMode {

		f.lock.RLock()

		defer f.lock.RUnlock()

	}

	}

}

// Section assumes named section exists and returns a zero-value when not.

func (f *File) Section(name string) *Section {

	sec, err := f.GetSection(name)

	if err != nil {

		// Note: It's OK here because the only possible error is empty section name,

		// but if it's empty, this piece of code won't be executed.

		sec, _ = f.NewSection(name)

		return sec

	}

	return sec

}

// Sections returns a list of Section stored in the current instance.

func (f *File) Sections() []*Section {

	if f.BlockMode {

		f.lock.RLock()

		defer f.lock.RUnlock()

	}

	sections := make([]*Section, len(f.sectionList))

	for i, name := range f.sectionList {

	}

	return sections

}

// ChildSections returns a list of child sections of given section name.

func (f *File) ChildSections(name string) []*Section {

	return f.Section(name).ChildSections()

}

// SectionStrings returns list of section names.

func (f *File) SectionStrings() []string {

	list := make([]string, len(f.sectionList))

	copy(list, f.sectionList)

	return list

}

func (f *File) DeleteSection(name string) {

	if f.BlockMode {

		f.lock.Lock()

		defer f.lock.Unlock()

	}

	}

}

func (f *File) reload(s dataSource) error {

	r, err := s.ReadCloser()

	if err != nil {

		return err

	}

	defer r.Close()

	return f.parse(r)

}

// Reload reloads and parses all data sources.

func (f *File) Reload() (err error) {

	for _, s := range f.dataSources {

		if err = f.reload(s); err != nil {

			// In loose mode, we create an empty default section for nonexistent files.

			if os.IsNotExist(err) && f.options.Loose {

				continue

			}

			return err

		}

	}

	return nil

}

// Append appends one or more data sources and reloads automatically.

func (f *File) Append(source interface{}, others ...interface{}) error {

	ds, err := parseDataSource(source)

	if err != nil {

		return err

	}

	f.dataSources = append(f.dataSources, ds)

	for _, s := range others {

		ds, err = parseDataSource(s)

		if err != nil {

			return err

		}

		f.dataSources = append(f.dataSources, ds)

	}

	return f.Reload()

}

func (f *File) writeToBuffer(indent string) (*bytes.Buffer, error) {

	if PrettyFormat || PrettyEqual {

	}

	// Use buffer to make sure target is safe until finish encoding.

	buf := bytes.NewBuffer(nil)

	for i, sname := range f.sectionList {

		if len(sec.Comment) > 0 {

			// Support multiline comments

			lines := strings.Split(sec.Comment, LineBreak)

			for i := range lines {

				if lines[i][0] != '#' && lines[i][0] != ';' {

					lines[i] = "; " + lines[i]

				} else {

					lines[i] = lines[i][:1] + " " + strings.TrimSpace(lines[i][1:])

				}

				if _, err := buf.WriteString(lines[i] + LineBreak); err != nil {

					return nil, err

				}

			}

		}

			if _, err := buf.WriteString("[" + sname + "]" + LineBreak); err != nil {

				return nil, err

			}

		} else {

			// Write nothing if default section is empty

			if len(sec.keyList) == 0 {

				continue

			}

		}

		if sec.isRawSection {

			if _, err := buf.WriteString(sec.rawBody); err != nil {

				return nil, err

			}

			if PrettySection {

				// Put a line between sections

				if _, err := buf.WriteString(LineBreak); err != nil {

					return nil, err

				}

			}

			continue

		}

		// Count and generate alignment length and buffer spaces using the

		// we need to take that into account in our calculation.

		alignLength := 0

		if PrettyFormat {

			for _, kname := range sec.keyList {

				keyLength := len(kname)

				// First case will surround key by ` and second by """

				if strings.Contains(kname, "\"") || strings.ContainsAny(kname, f.options.KeyValueDelimiters) {

					keyLength += 2

				} else if strings.Contains(kname, "`") {

					keyLength += 6

				}

				if keyLength > alignLength {

					alignLength = keyLength