package main

import (
	"fmt"
	"log"
	"os"

	"github.com/bmatcuk/doublestar"
)

/*
	When adding new manifest types, for new package managers
	add a new entry here.
*/

func manifestGlobs() []string {

	globs := make([]string, 0)

	// Hackage
	globs = append(globs, "*.cabal")
	// npm
	globs = append(globs, "package.json")
	globs = append(globs, "package-lock.json")
	globs = append(globs, "npm-shrinkwrap.json")
	globs = append(globs, "yarn.lock")
	// Maven
	globs = append(globs, "pom.xml")
	globs = append(globs, "ivy.xml")
	globs = append(globs, "build.gradle")
	// RubyGems
	globs = append(globs, "Gemfile")
	globs = append(globs, "Gemfile.lock")
	globs = append(globs, "gems.rb")
	globs = append(globs, "gems.locked")
	globs = append(globs, "*.gemspec")
	// Packagist
	globs = append(globs, "composer.json")
	globs = append(globs, "composer.lock")
	// PyPi
	globs = append(globs, "setup.py")
	globs = append(globs, "req*.txt")
	globs = append(globs, "req*.pip")
	globs = append(globs, "requirements/*.txt")
	globs = append(globs, "requirements/*.pip")
	globs = append(globs, "Pipfile")
	globs = append(globs, "Pipfile.lock")
	// Nuget
	globs = append(globs, "packages.config")
	globs = append(globs, "Project.json")
	globs = append(globs, "Project.lock.json")
	globs = append(globs, "*.nuspec")
	globs = append(globs, "paket.lock")
	globs = append(globs, "*.csproj")
	// Bower
	globs = append(globs, "bower.json")
	// CPAN
	globs = append(globs, "META.json")
	globs = append(globs, "META.yml")
	// CocoaPods
	globs = append(globs, "Podfile")
	globs = append(globs, "Podfile.lock")
	globs = append(globs, "*.podspec")
	// Clojars
	globs = append(globs, "project.clj")
	// Meteor
	globs = append(globs, "versions.json")
	// CRAN
	globs = append(globs, "DESCRIPTION")
	// Cargo
	globs = append(globs, "Cargo.toml")
	globs = append(globs, "Cargo.lock")
	// Hex
	globs = append(globs, "mix.exs")
	globs = append(globs, "mix.lock")
	// Swift
	globs = append(globs, "Package.swift")
	// Pub
	globs = append(globs, "pubspec.yaml")
	globs = append(globs, "pubspec.lock")
	// Carthage
	globs = append(globs, "Cartfile")
	globs = append(globs, "Cartfile.private")
	globs = append(globs, "Cartfile.resolved")
	// Dub
	globs = append(globs, "dub.json")
	globs = append(globs, "dub.sdl")
	// Julia
	globs = append(globs, "REQUIRE")
	// Shards
	globs = append(globs, "shard.yml")
	globs = append(globs, "shard.lock")
	// Go
	globs = append(globs, "glide.yaml")
	globs = append(globs, "glide.lock")
	globs = append(globs, "Godeps")
	globs = append(globs, "Godeps/Godeps.json")
	globs = append(globs, "vendor/manifest")
	globs = append(globs, "vendor/vendor.json")
	globs = append(globs, "Gopkg.toml")
	globs = append(globs, "Gopkg.lock")
	// Elm
	globs = append(globs, "elm-package.json")
	globs = append(globs, "elm_dependencies.json")
	globs = append(globs, "elm-stuff/exact-dependencies.json")
	// Haxelib
	globs = append(globs, "haxelib.json")
	// Hackage
	globs = append(globs, "*.cabal")
	globs = append(globs, "cabal.config")

	return globs
}

func getListOfManifestFilenames(directory string) []string {
	os.Chdir(directory)
	matchingFiles := make([]string, 0)

	for _, glob := range manifestGlobs() {
		pathGlob := fmt.Sprintf("**/%s", glob)
		files := getListOfGlobMatches(pathGlob)

		if len(files) > 0 {
			matchingFiles = append(matchingFiles, files...)
		}
	}
	return matchingFiles
}

func getListOfGlobMatches(glob string) []string {
	files, err := doublestar.Glob(glob)
	if err != nil {
		log.Fatal(err)
	}
	return files
}