// Copyright 2013 gopm authors.
//
// 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 cmd

import (
	//"errors"
	"fmt"
	"strings"
)

const (
	TRUNK  = "trunk"
	TAG    = "tag"
	BRANCH = "branch"
	COMMIT = "commit"
)

var (
	downloadCache map[string]bool // Saves packages that have been downloaded.
	services      []Service       = []Service{
		&GithubService{},
		&GitOscService{},
		&BitBucketService{},
		//&GitCafeService{},
		//&CodeCSDNSource{},
	}
)

func getService(pkgName string) Service {
	for _, service := range services {
		if service.HasPkg(pkgName) {
			return service
		}
	}
	return nil
}

type Service interface {
	PkgUrl(pkg *Pkg) string
	HasPkg(pkgName string) bool
	PkgExt() string
}

type Pkg struct {
	Service Service
	Name    string
	Ver     string
	VerId   string
}

func (p *Pkg) VerSimpleString() string {
	if p.VerId != "" {
		return p.VerId
	}
	return p.Ver
}

func (p *Pkg) VerString() string {
	if p.VerId == "" {
		return p.Ver
	}
	return fmt.Sprintf("%v:%v", p.Ver, p.VerId)
}

func (p *Pkg) Url() string {
	return p.Service.PkgUrl(p)
}

func (p *Pkg) FileName() string {
	return fmt.Sprintf("%v.%v", p.VerSimpleString(), p.Service.PkgExt())
}

func NewPkg(pkgName string, ver string) *Pkg {
	vers := strings.Split(ver, ":")
	if len(vers) > 2 {
		return nil
	}

	var verId string
	if len(vers) == 2 {
		verId = vers[1]
	}

	service := getService(pkgName)
	if service == nil {
		return nil
	}

	return &Pkg{service, pkgName, vers[0], verId}
}

// github repository
type GithubService struct {
}

func (s *GithubService) PkgUrl(pkg *Pkg) string {
	var verPath string
	if pkg.Ver == TRUNK {
		verPath = "master"
	} else {
		verPath = pkg.VerId
	}
	return fmt.Sprintf("https://%v/archive/%v.zip", pkg.Name, verPath)
}

func (s *GithubService) HasPkg(pkgName string) bool {
	return strings.HasPrefix(pkgName, "github.com")
}

func (s *GithubService) PkgExt() string {
	return "zip"
}

// git osc repos
type GitOscService struct {
}

func (s *GitOscService) PkgUrl(pkg *Pkg) string {
	var verPath string
	if pkg.Ver == TRUNK {
		verPath = "master"
	} else {
		verPath = pkg.VerId
	}
	return fmt.Sprintf("https://%v/repository/archive?ref=%v", pkg.Name, verPath)
}

func (s *GitOscService) HasPkg(pkgName string) bool {
	return strings.HasPrefix(pkgName, "git.oschina.net")
}

func (s *GitOscService) PkgExt() string {
	return "zip"
}

// bitbucket.org
type BitBucketService struct {
}

func (s *BitBucketService) PkgUrl(pkg *Pkg) string {
	var verPath string
	if pkg.Ver == TRUNK {
		verPath = "default"
	} else {
		verPath = pkg.VerId
	}

	return fmt.Sprintf("https://%v/get/%v.zip", pkg.Name, verPath)
}

func (s *BitBucketService) HasPkg(pkgName string) bool {
	return strings.HasPrefix(pkgName, "bitbucket.org")
}

func (s *BitBucketService) PkgExt() string {
	return "zip"
}

type GitCafeService struct {
}

func (s *GitCafeService) PkgUrl(pkg *Pkg) string {
	var verPath string
	if pkg.Ver == TRUNK {
		verPath = "master"
	} else {
		verPath = pkg.VerId
	}

	return fmt.Sprintf("https://%v/tarball/%v", pkg.Name, verPath)
}

func (s *GitCafeService) HasPkg(pkgName string) bool {
	return strings.HasPrefix(pkgName, "gitcafe.com")
}

func (s *GitCafeService) PkgExt() string {
	return "tar.gz"
}

// git lab repos, not completed
type GitLabService struct {
	DomainOrIp string
	Username   string
	Passwd     string
	PrivateKey string
}

func (s *GitLabService) PkgUrl(pkg *Pkg) string {
	var verPath string
	if pkg.Ver == TRUNK {
		verPath = "master"
	} else {
		verPath = pkg.VerId
	}

	return fmt.Sprintf("https://%v/repository/archive/%v", pkg.Name, verPath)
}

func (s *GitLabService) HasPkg(pkgName string) bool {
	return strings.HasPrefix(pkgName, s.DomainOrIp)
}

func (s *GitLabService) PkgExt() string {
	return "tar.gz"
}

// code.csdn.net
type CodeCSDNService struct {
}

func (s *CodeCSDNService) PkgUrl(pkg *Pkg) string {
	var verPath string
	if pkg.Ver == TRUNK {
		verPath = "master"
	} else {
		verPath = pkg.VerId
	}

	return fmt.Sprintf("https://%v/repository/archive?ref=%v", pkg.Name, verPath)
}

func (s *CodeCSDNService) HasPkg(pkgName string) bool {
	return strings.HasPrefix(pkgName, "code.csdn.net")
}

func (s *CodeCSDNService) PkgExt() string {
	return "zip"
}