// Copyright 2019 Sorint.lab
//
// 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 action

import (
	"context"
	"fmt"
	"net/http"
	"net/url"
	"path"

	csapi "github.com/sorintlab/agola/internal/services/configstore/api"
	"github.com/sorintlab/agola/internal/services/types"
	"github.com/sorintlab/agola/internal/util"

	"github.com/pkg/errors"
)

func (h *ActionHandler) GetProject(ctx context.Context, projectRef string) (*csapi.Project, error) {
	project, resp, err := h.configstoreClient.GetProject(ctx, projectRef)
	if err != nil {
		return nil, ErrFromRemote(resp, err)
	}

	isProjectMember, err := h.IsProjectMember(ctx, project.OwnerType, project.OwnerID)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to determine ownership")
	}
	if project.GlobalVisibility == types.VisibilityPublic {
		return project, nil
	}
	if !isProjectMember {
		return nil, util.NewErrForbidden(errors.Errorf("user not authorized"))
	}

	return project, nil
}

type CreateProjectRequest struct {
	Name                string
	ParentRef           string
	Visibility          types.Visibility
	RemoteSourceName    string
	RepoPath            string
	SkipSSHHostKeyCheck bool
}

func (h *ActionHandler) CreateProject(ctx context.Context, req *CreateProjectRequest) (*csapi.Project, error) {
	curUserID := h.CurrentUserID(ctx)

	user, resp, err := h.configstoreClient.GetUser(ctx, curUserID)
	if err != nil {
		return nil, ErrFromRemote(resp, errors.Wrapf(err, "failed to get user %q", curUserID))
	}
	parentRef := req.ParentRef
	if parentRef == "" {
		// create project in current user namespace
		parentRef = path.Join("user", user.Name)
	}

	pg, resp, err := h.configstoreClient.GetProjectGroup(ctx, parentRef)
	if err != nil {
		return nil, ErrFromRemote(resp, errors.Wrapf(err, "failed to get project group %q", parentRef))
	}

	isProjectOwner, err := h.IsProjectOwner(ctx, pg.OwnerType, pg.OwnerID)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to determine ownership")
	}
	if !isProjectOwner {
		return nil, util.NewErrForbidden(errors.Errorf("user not authorized"))
	}

	if !util.ValidateName(req.Name) {
		return nil, util.NewErrBadRequest(errors.Errorf("invalid project name %q", req.Name))
	}
	if req.RemoteSourceName == "" {
		return nil, util.NewErrBadRequest(errors.Errorf("empty remote source name"))
	}
	if req.RepoPath == "" {
		return nil, util.NewErrBadRequest(errors.Errorf("empty remote repo path"))
	}

	projectPath := path.Join(pg.Path, req.Name)
	_, resp, err = h.configstoreClient.GetProject(ctx, projectPath)
	if err != nil {
		if resp != nil && resp.StatusCode != http.StatusNotFound {
			return nil, ErrFromRemote(resp, errors.Wrapf(err, "failed to get project %q", req.Name))
		}
	} else {
		return nil, util.NewErrBadRequest(errors.Errorf("project %q already exists", projectPath))
	}

	rs, resp, err := h.configstoreClient.GetRemoteSource(ctx, req.RemoteSourceName)
	if err != nil {
		return nil, ErrFromRemote(resp, errors.Wrapf(err, "failed to get remote source %q", req.RemoteSourceName))
	}
	h.log.Infof("rs: %s", util.Dump(rs))
	var la *types.LinkedAccount
	for _, v := range user.LinkedAccounts {
		if v.RemoteSourceID == rs.ID {
			la = v
			break
		}
	}
	h.log.Infof("la: %s", util.Dump(la))
	if la == nil {
		return nil, errors.Errorf("user doesn't have a linked account for remote source %q", rs.Name)
	}

	gitsource, err := h.GetGitSource(ctx, rs, user.Name, la)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to create gitsource client")
	}

	repo, err := gitsource.GetRepoInfo(req.RepoPath)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to get repository info from gitsource")
	}

	h.log.Infof("generating ssh key pairs")
	privateKey, _, err := util.GenSSHKeyPair(4096)
	if err != nil {
		return nil, errors.Wrapf(err, "failed to generate ssh key pair")
	}

	p := &types.Project{
		Name: req.Name,
		Parent: types.Parent{
			Type: types.ConfigTypeProjectGroup,
			ID:   parentRef,
		},
		Visibility:                 req.Visibility,
		RemoteRepositoryConfigType: types.RemoteRepositoryConfigTypeRemoteSource,
		RemoteSourceID:             rs.ID,
		LinkedAccountID:            la.ID,
		RepositoryID:               repo.ID,
		RepositoryPath:             req.RepoPath,
		SkipSSHHostKeyCheck:        req.SkipSSHHostKeyCheck,
		SSHPrivateKey:              string(privateKey),
	}

	h.log.Infof("creating project")
	rp, resp, err := h.configstoreClient.CreateProject(ctx, p)
	if err != nil {
		return nil, ErrFromRemote(resp, errors.Wrapf(err, "failed to create project"))
	}
	h.log.Infof("project %s created, ID: %s", p.Name, p.ID)

	return rp, h.SetupProject(ctx, rs, user, la, rp)
}

func (h *ActionHandler) SetupProject(ctx context.Context, rs *types.RemoteSource, user *types.User, la *types.LinkedAccount, project *csapi.Project) error {
	gitsource, err := h.GetGitSource(ctx, rs, user.Name, la)
	if err != nil {
		return errors.Wrapf(err, "failed to create gitsource client")
	}

	pubKey, err := util.ExtractPublicKey([]byte(project.SSHPrivateKey))
	if err != nil {
		return errors.Wrapf(err, "failed to extract public key")
	}

	webhookURL, err := url.Parse(fmt.Sprintf("%s/webhooks", h.apiExposedURL))
	if err != nil {
		return errors.Wrapf(err, "failed to generate webhook url")
	}
	q := url.Values{}
	q.Add("projectid", project.ID)
	q.Add("agolaid", h.agolaID)
	webhookURL.RawQuery = q.Encode()

	// generate deploy keys and webhooks containing the agola project id so we
	// can have multiple projects referencing the same remote repository and this
	// will trigger multiple different runs
	deployKeyName := fmt.Sprintf("agola deploy key - %s", project.ID)
	h.log.Infof("creating/updating deploy key: %s", string(pubKey))
	if err := gitsource.UpdateDeployKey(project.RepositoryPath, deployKeyName, string(pubKey), true); err != nil {
		return errors.Wrapf(err, "failed to create deploy key")
	}
	h.log.Infof("deleting existing webhooks")
	if err := gitsource.DeleteRepoWebhook(project.RepositoryPath, webhookURL.String()); err != nil {
		return errors.Wrapf(err, "failed to delete repository webhook")
	}
	h.log.Infof("creating webhook to url: %s", webhookURL)
	if err := gitsource.CreateRepoWebhook(project.RepositoryPath, webhookURL.String(), project.WebhookSecret); err != nil {
		return errors.Wrapf(err, "failed to create repository webhook")
	}

	return nil
}

func (h *ActionHandler) ReconfigProject(ctx context.Context, projectRef string) error {
	p, resp, err := h.configstoreClient.GetProject(ctx, projectRef)
	if err != nil {
		return ErrFromRemote(resp, errors.Wrapf(err, "failed to get project %q", projectRef))
	}

	isProjectOwner, err := h.IsProjectOwner(ctx, p.OwnerType, p.OwnerID)
	if err != nil {
		return errors.Wrapf(err, "failed to determine ownership")
	}
	if !isProjectOwner {
		return util.NewErrForbidden(errors.Errorf("user not authorized"))
	}

	user, resp, err := h.configstoreClient.GetUserByLinkedAccount(ctx, p.LinkedAccountID)
	if err != nil {
		return ErrFromRemote(resp, errors.Wrapf(err, "failed to get user with linked account id %q", p.LinkedAccountID))
	}

	la := user.LinkedAccounts[p.LinkedAccountID]
	h.log.Infof("la: %s", util.Dump(la))
	if la == nil {
		return errors.Errorf("linked account %q in user %q doesn't exist", p.LinkedAccountID, user.Name)
	}

	rs, resp, err := h.configstoreClient.GetRemoteSource(ctx, la.RemoteSourceID)
	if err != nil {
		return ErrFromRemote(resp, errors.Wrapf(err, "failed to get remote source %q", la.RemoteSourceID))
	}

	// TODO(sgotti) update project repo path if the remote let us query by repository id

	return h.SetupProject(ctx, rs, user, la, p)
}

func (h *ActionHandler) DeleteProject(ctx context.Context, projectRef string) error {
	p, resp, err := h.configstoreClient.GetProject(ctx, projectRef)
	if err != nil {
		return ErrFromRemote(resp, errors.Wrapf(err, "failed to get project %q", projectRef))
	}

	isProjectOwner, err := h.IsProjectOwner(ctx, p.OwnerType, p.OwnerID)
	if err != nil {
		return errors.Wrapf(err, "failed to determine ownership")
	}
	if !isProjectOwner {
		return util.NewErrForbidden(errors.Errorf("user not authorized"))
	}

	resp, err = h.configstoreClient.DeleteProject(ctx, projectRef)
	if err != nil {
		return ErrFromRemote(resp, err)
	}
	return nil
}