// Copyright 2014 The Gogs Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.

package repo

import (
	"path"

	"github.com/Unknwon/com"

	api "github.com/gogits/go-gogs-client"

	"github.com/gogits/gogs/models"
	"github.com/gogits/gogs/modules/auth"
	"github.com/gogits/gogs/modules/log"
	"github.com/gogits/gogs/modules/middleware"
	"github.com/gogits/gogs/modules/setting"
	to "github.com/gogits/gogs/routers/api/v1/utils"
)

// https://github.com/gogits/go-gogs-client/wiki/Repositories#search-repositories
func Search(ctx *middleware.Context) {
	opt := models.SearchOption{
		Keyword: path.Base(ctx.Query("q")),
		Uid:     com.StrTo(ctx.Query("uid")).MustInt64(),
		Limit:   com.StrTo(ctx.Query("limit")).MustInt(),
	}
	if opt.Limit == 0 {
		opt.Limit = 10
	}

	// Check visibility.
	if ctx.IsSigned && opt.Uid > 0 {
		if ctx.User.Id == opt.Uid {
			opt.Private = true
		} else {
			u, err := models.GetUserByID(opt.Uid)
			if err != nil {
				ctx.JSON(500, map[string]interface{}{
					"ok":    false,
					"error": err.Error(),
				})
				return
			}
			if u.IsOrganization() && u.IsOwnedBy(ctx.User.Id) {
				opt.Private = true
			}
			// FIXME: how about collaborators?
		}
	}

	repos, err := models.SearchRepositoryByName(opt)
	if err != nil {
		ctx.JSON(500, map[string]interface{}{
			"ok":    false,
			"error": err.Error(),
		})
		return
	}

	results := make([]*api.Repository, len(repos))
	for i := range repos {
		if err = repos[i].GetOwner(); err != nil {
			ctx.JSON(500, map[string]interface{}{
				"ok":    false,
				"error": err.Error(),
			})
			return
		}
		results[i] = &api.Repository{
			Id:       repos[i].ID,
			FullName: path.Join(repos[i].Owner.Name, repos[i].Name),
		}
	}

	ctx.JSON(200, map[string]interface{}{
		"ok":   true,
		"data": results,
	})
}

// https://github.com/gogits/go-gogs-client/wiki/Repositories#list-your-repositories
func ListMyRepos(ctx *middleware.Context) {
	ownRepos, err := models.GetRepositories(ctx.User.Id, true)
	if err != nil {
		ctx.APIError(500, "GetRepositories", err)
		return
	}
	numOwnRepos := len(ownRepos)

	accessibleRepos, err := ctx.User.GetRepositoryAccesses()
	if err != nil {
		ctx.APIError(500, "GetRepositoryAccesses", err)
		return
	}

	repos := make([]*api.Repository, numOwnRepos+len(accessibleRepos))
	for i := range ownRepos {
		repos[i] = to.ApiRepository(ctx.User, ownRepos[i], api.Permission{true, true, true})
	}
	i := numOwnRepos

	for repo, access := range accessibleRepos {
		repos[i] = to.ApiRepository(repo.Owner, repo, api.Permission{
			Admin: access >= models.ACCESS_MODE_ADMIN,
			Push:  access >= models.ACCESS_MODE_WRITE,
			Pull:  true,
		})
		i++
	}

	ctx.JSON(200, &repos)
}

func createRepo(ctx *middleware.Context, owner *models.User, opt api.CreateRepoOption) {
	repo, err := models.CreateRepository(owner, models.CreateRepoOptions{
		Name:        opt.Name,
		Description: opt.Description,
		Gitignores:  opt.Gitignores,
		License:     opt.License,
		Readme:      opt.Readme,
		IsPrivate:   opt.Private,
		AutoInit:    opt.AutoInit,
	})
	if err != nil {
		if models.IsErrRepoAlreadyExist(err) ||
			models.IsErrNameReserved(err) ||
			models.IsErrNamePatternNotAllowed(err) {
			ctx.APIError(422, "", err)
		} else {
			if repo != nil {
				if err = models.DeleteRepository(ctx.User.Id, repo.ID); err != nil {
					log.Error(4, "DeleteRepository: %v", err)
				}
			}
			ctx.APIError(500, "CreateRepository", err)
		}
		return
	}

	ctx.JSON(201, to.ApiRepository(owner, repo, api.Permission{true, true, true}))
}

// https://github.com/gogits/go-gogs-client/wiki/Repositories#create
func Create(ctx *middleware.Context, opt api.CreateRepoOption) {
	// Shouldn't reach this condition, but just in case.
	if ctx.User.IsOrganization() {
		ctx.APIError(422, "", "not allowed creating repository for organization")
		return
	}
	createRepo(ctx, ctx.User, opt)
}

func CreateOrgRepo(ctx *middleware.Context, opt api.CreateRepoOption) {
	org, err := models.GetOrgByName(ctx.Params(":org"))
	if err != nil {
		if models.IsErrUserNotExist(err) {
			ctx.APIError(422, "", err)
		} else {
			ctx.APIError(500, "GetOrgByName", err)
		}
		return
	}

	if !org.IsOwnedBy(ctx.User.Id) {
		ctx.APIError(403, "", "Given user is not owner of organization.")
		return
	}
	createRepo(ctx, org, opt)
}

// https://github.com/gogits/go-gogs-client/wiki/Repositories#migrate
func Migrate(ctx *middleware.Context, form auth.MigrateRepoForm) {
	ctxUser := ctx.User
	// Not equal means context user is an organization,
	// or is another user/organization if current user is admin.
	if form.Uid != ctxUser.Id {
		org, err := models.GetUserByID(form.Uid)
		if err != nil {
			if models.IsErrUserNotExist(err) {
				ctx.APIError(422, "", err)
			} else {
				ctx.APIError(500, "GetUserByID", err)
			}
			return
		}
		ctxUser = org
	}

	if ctx.HasError() {
		ctx.APIError(422, "", ctx.GetErrMsg())
		return
	}

	if ctxUser.IsOrganization() && !ctx.User.IsAdmin {
		// Check ownership of organization.
		if !ctxUser.IsOwnedBy(ctx.User.Id) {
			ctx.APIError(403, "", "Given user is not owner of organization.")
			return
		}
	}

	remoteAddr, err := form.ParseRemoteAddr(ctx.User)
	if err != nil {
		if models.IsErrInvalidCloneAddr(err) {
			addrErr := err.(models.ErrInvalidCloneAddr)
			switch {
			case addrErr.IsURLError:
				ctx.APIError(422, "", err)
			case addrErr.IsPermissionDenied:
				ctx.APIError(422, "", "You are not allowed to import local repositories.")
			case addrErr.IsInvalidPath:
				ctx.APIError(422, "", "Invalid local path, it does not exist or not a directory.")
			default:
				ctx.APIError(500, "ParseRemoteAddr", "Unknown error type (ErrInvalidCloneAddr): "+err.Error())
			}
		} else {
			ctx.APIError(500, "ParseRemoteAddr", err)
		}
		return
	}

	repo, err := models.MigrateRepository(ctxUser, models.MigrateRepoOptions{
		Name:        form.RepoName,
		Description: form.Description,
		IsPrivate:   form.Private || setting.Repository.ForcePrivate,
		IsMirror:    form.Mirror,
		RemoteAddr:  remoteAddr,
	})
	if err != nil {
		if repo != nil {
			if errDelete := models.DeleteRepository(ctxUser.Id, repo.ID); errDelete != nil {
				log.Error(4, "DeleteRepository: %v", errDelete)
			}
		}
		ctx.APIError(500, "MigrateRepository", err)
		return
	}

	log.Trace("Repository migrated: %s/%s", ctxUser.Name, form.RepoName)
	ctx.JSON(201, to.ApiRepository(ctxUser, repo, api.Permission{true, true, true}))
}

func parseOwnerAndRepo(ctx *middleware.Context) (*models.User, *models.Repository) {
	owner, err := models.GetUserByName(ctx.Params(":username"))
	if err != nil {
		if models.IsErrUserNotExist(err) {
			ctx.APIError(422, "", err)
		} else {
			ctx.APIError(500, "GetUserByName", err)
		}
		return nil, nil
	}

	repo, err := models.GetRepositoryByName(owner.Id, ctx.Params(":reponame"))
	if err != nil {
		if models.IsErrRepoNotExist(err) {
			ctx.Error(404)
		} else {
			ctx.APIError(500, "GetRepositoryByName", err)
		}
		return nil, nil
	}

	return owner, repo
}

// https://github.com/gogits/go-gogs-client/wiki/Repositories#get
func Get(ctx *middleware.Context) {
	owner, repo := parseOwnerAndRepo(ctx)
	if ctx.Written() {
		return
	}

	ctx.JSON(200, to.ApiRepository(owner, repo, api.Permission{true, true, true}))
}

// https://github.com/gogits/go-gogs-client/wiki/Repositories#delete
func Delete(ctx *middleware.Context) {
	owner, repo := parseOwnerAndRepo(ctx)
	if ctx.Written() {
		return
	}

	if owner.IsOrganization() && !owner.IsOwnedBy(ctx.User.Id) {
		ctx.APIError(403, "", "Given user is not owner of organization.")
		return
	}

	if err := models.DeleteRepository(owner.Id, repo.ID); err != nil {
		ctx.APIError(500, "DeleteRepository", err)
		return
	}

	log.Trace("Repository deleted: %s/%s", owner.Name, repo.Name)
	ctx.Status(204)
}