// Copyright 2022 Harness Inc. All rights reserved.
// Use of this source code is governed by the Polyform Free Trial License
// that can be found in the LICENSE.md file for this repository.

package service

import (
	"errors"
	"fmt"

	"github.com/harness/gitness/gitrpc/internal/types"
	"github.com/harness/gitness/gitrpc/rpc"
	"github.com/rs/zerolog/log"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

// Logs the error and message, returns either the provided message or a rpc equivalent if possible.
// Always logs the full message with error as warning.
func processGitErrorf(err error, format string, args ...interface{}) error {
	// create fallback error returned if we can't map it
	message := fmt.Sprintf(format, args...)

	// always log internal error together with message.
	log.Warn().Msgf("%s: [GIT] %v", message, err)

	switch {
	case errors.Is(err, types.ErrNotFound):
		return status.Error(codes.NotFound, message)
	case errors.Is(err, types.ErrAlreadyExists):
		return status.Errorf(codes.AlreadyExists, message)
	case errors.Is(err, types.ErrInvalidArgument):
		return status.Errorf(codes.InvalidArgument, message)
	default:
		return status.Errorf(codes.Unknown, message)
	}
}

func mapSortOrder(s rpc.SortOrder) types.SortOrder {
	switch s {
	case rpc.SortOrder_Asc:
		return types.SortOrderAsc
	case rpc.SortOrder_Desc:
		return types.SortOrderDesc
	case rpc.SortOrder_Default:
		return types.SortOrderDefault
	default:
		// no need to error out - just use default for sorting
		return types.SortOrderDefault
	}
}

func mapListCommitTagsSortOption(s rpc.ListCommitTagsRequest_SortOption) types.GitReferenceField {
	switch s {
	case rpc.ListCommitTagsRequest_Date:
		return types.GitReferenceFieldCreatorDate
	case rpc.ListCommitTagsRequest_Name:
		return types.GitReferenceFieldRefName
	case rpc.ListCommitTagsRequest_Default:
		return types.GitReferenceFieldRefName
	default:
		// no need to error out - just use default for sorting
		return types.GitReferenceFieldRefName
	}
}

func mapListBranchesSortOption(s rpc.ListBranchesRequest_SortOption) types.GitReferenceField {
	switch s {
	case rpc.ListBranchesRequest_Date:
		return types.GitReferenceFieldCreatorDate
	case rpc.ListBranchesRequest_Name:
		return types.GitReferenceFieldRefName
	case rpc.ListBranchesRequest_Default:
		return types.GitReferenceFieldRefName
	default:
		// no need to error out - just use default for sorting
		return types.GitReferenceFieldRefName
	}
}

// TODO: Add UTs to ensure enum values match!
func mapGitNodeType(t types.TreeNodeType) rpc.TreeNodeType {
	return rpc.TreeNodeType(t)
}

// TODO: Add UTs to ensure enum values match!
func mapGitMode(m types.TreeNodeMode) rpc.TreeNodeMode {
	return rpc.TreeNodeMode(m)
}

func mapGitBranch(gitBranch *types.Branch) (*rpc.Branch, error) {
	if gitBranch == nil {
		return nil, status.Errorf(codes.Internal, "git branch is nil")
	}

	var commit *rpc.Commit
	var err error
	if gitBranch.Commit != nil {
		commit, err = mapGitCommit(gitBranch.Commit)
		if err != nil {
			return nil, err
		}
	}

	return &rpc.Branch{
		Name:   gitBranch.Name,
		Sha:    gitBranch.SHA,
		Commit: commit,
	}, nil
}

func mapGitCommit(gitCommit *types.Commit) (*rpc.Commit, error) {
	if gitCommit == nil {
		return nil, status.Errorf(codes.Internal, "git commit is nil")
	}

	return &rpc.Commit{
		Sha:       gitCommit.SHA,
		Title:     gitCommit.Title,
		Message:   gitCommit.Message,
		Author:    mapGitSignature(gitCommit.Author),
		Committer: mapGitSignature(gitCommit.Committer),
	}, nil
}

func mapGitSignature(gitSignature types.Signature) *rpc.Signature {
	return &rpc.Signature{
		Identity: &rpc.Identity{
			Name:  gitSignature.Identity.Name,
			Email: gitSignature.Identity.Email,
		},
		When: gitSignature.When.Unix(),
	}
}