package errors

import (
	"errors"
	"strings"
)

var (
	// ErrGitCommand is thrown when git command returned an error code
	ErrGitCommand = errors.New("git command returned error code")
	// ErrAuthenticationRequired is thrown when an authentication required on
	// a remote operation
	ErrAuthenticationRequired = errors.New("authentication required")
	// ErrAuthorizationFailed is thrown when authorization failed while trying
	// to authenticate with remote
	ErrAuthorizationFailed = errors.New("authorization failed")
	// ErrInvalidAuthMethod is thrown when invalid auth method is invoked
	ErrInvalidAuthMethod = errors.New("invalid auth method")
	// ErrAlreadyUpToDate is thrown when a repository is already up to date
	// with its src on merge/fetch/pull
	ErrAlreadyUpToDate = errors.New("already up to date")
	// ErrCouldNotFindRemoteRef is thrown when trying to fetch/pull cannot
	// find suitable remote reference
	ErrCouldNotFindRemoteRef = errors.New("could not find remote ref")
	// ErrMergeAbortedTryCommit indicates that the repositort is not clean and
	// some changes may conflict with the merge
	ErrMergeAbortedTryCommit = errors.New("stash/commit changes. aborted")
	// ErrRemoteBranchNotSpecified means that default remote branch is not set
	// for the current branch. can be setted with "git config --local --add
	// branch.<your branch name>.remote=<your remote name> "
	ErrRemoteBranchNotSpecified = errors.New("upstream not set")
	// ErrRemoteNotFound is thrown when the remote is not reachable. It may be
	// caused by the deletion of the remote or coneectivty problems
	ErrRemoteNotFound = errors.New("remote not found")
	// ErrConflictAfterMerge is thrown when a conflict occurs at merging two
	// references
	ErrConflictAfterMerge = errors.New("conflict while merging")
	// ErrUnmergedFiles possibly occurs after a conflict
	ErrUnmergedFiles = errors.New("unmerged files detected")
	// ErrReferenceBroken thrown when unable to resolve reference
	ErrReferenceBroken = errors.New("unable to resolve reference")
	// ErrUnclassified is unconsidered error type
	ErrUnclassified = errors.New("unclassified error")
)

// ParseGitError takes git output as an input and tries to find some meaningful
// errors can be used by the app
func ParseGitError(out string, err error) error {
	if strings.Contains(out, "error: Your local changes to the following files would be overwritten by merge") {
		return ErrMergeAbortedTryCommit
	} else if strings.Contains(out, "ERROR: Repository not found") {
		return ErrRemoteNotFound
	} else if strings.Contains(out, "for your current branch, you must specify a branch on the command line") {
		return ErrRemoteBranchNotSpecified
	} else if strings.Contains(out, "Automatic merge failed; fix conflicts and then commit the result") {
		return ErrConflictAfterMerge
	} else if strings.Contains(out, "error: Pulling is not possible because you have unmerged files.") {
		return ErrUnmergedFiles
	} else if strings.Contains(out, "unable to resolve reference") {
		return ErrReferenceBroken
	}
	return ErrUnclassified
}