// Copyright 2016-present The Hugo Authors. All rights reserved.
//
// 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 helpers

import (
	"fmt"

	"github.com/spf13/hugo/config"
	"github.com/spf13/hugo/hugofs"
)

// PathSpec holds methods that decides how paths in URLs and files in Hugo should look like.
type PathSpec struct {
	BaseURL

	disablePathToLower bool
	removePathAccents  bool
	uglyURLs           bool
	canonifyURLs       bool

	language *Language

	// pagination path handling
	paginatePath string

	theme string

	// Directories
	themesDir  string
	layoutDir  string
	workingDir string
	staticDir  string

	// The PathSpec looks up its config settings in both the current language
	// and then in the global Viper config.
	// Some settings, the settings listed below, does not make sense to be set
	// on per-language-basis. We have no good way of protecting against this
	// other than a "white-list". See language.go.
	defaultContentLanguageInSubdir bool
	defaultContentLanguage         string
	multilingual                   bool

	// The file systems to use
	fs *hugofs.Fs
}

func (p PathSpec) String() string {
	return fmt.Sprintf("PathSpec, language %q, prefix %q, multilingual: %T", p.language.Lang, p.getLanguagePrefix(), p.multilingual)
}

// NewPathSpec creats a new PathSpec from the given filesystems and Language.
func NewPathSpec(fs *hugofs.Fs, cfg config.Provider) *PathSpec {

	// TODO(bep) output error handling
	baseURL, _ := newBaseURLFromString(cfg.GetString("baseURL"))

	ps := &PathSpec{
		fs:                             fs,
		disablePathToLower:             cfg.GetBool("disablePathToLower"),
		removePathAccents:              cfg.GetBool("removePathAccents"),
		uglyURLs:                       cfg.GetBool("uglyURLs"),
		canonifyURLs:                   cfg.GetBool("canonifyURLs"),
		multilingual:                   cfg.GetBool("multilingual"),
		defaultContentLanguageInSubdir: cfg.GetBool("defaultContentLanguageInSubdir"),
		defaultContentLanguage:         cfg.GetString("defaultContentLanguage"),
		paginatePath:                   cfg.GetString("paginatePath"),
		BaseURL:                        baseURL,
		themesDir:                      cfg.GetString("themesDir"),
		layoutDir:                      cfg.GetString("layoutDir"),
		workingDir:                     cfg.GetString("workingDir"),
		staticDir:                      cfg.GetString("staticDir"),
		theme:                          cfg.GetString("theme"),
	}

	if language, ok := cfg.(*Language); ok {
		ps.language = language
	}

	return ps
}

// PaginatePath returns the configured root path used for paginator pages.
func (p *PathSpec) PaginatePath() string {
	return p.paginatePath
}