package git

import (
	"path/filepath"

	"github.com/golang/glog"
	"github.com/openshift/source-to-image/pkg/api"
	"github.com/openshift/source-to-image/pkg/errors"
	"github.com/openshift/source-to-image/pkg/util"
)

type Clone struct {
	Git
	util.FileSystem
}

// Download downloads the application source code from the Git repository
// and checkout the Ref specified in the config.
func (c *Clone) Download(config *api.Config) (*api.SourceInfo, error) {
	targetSourceDir := filepath.Join(config.WorkingDir, api.Source)
	config.WorkingSourceDir = targetSourceDir
	var info *api.SourceInfo
	hasRef := len(config.Ref) > 0
	hasSubmodules := !config.DisableRecursive
	cloneConfig := api.CloneConfig{Quiet: true, Recursive: hasSubmodules && !hasRef}

	if c.ValidCloneSpec(config.Source) {
		if len(config.ContextDir) > 0 {
			targetSourceDir = filepath.Join(config.WorkingDir, api.ContextTmp)
			glog.Infof("Downloading %q (%q) ...", config.Source, config.ContextDir)
		} else {
			glog.Infof("Downloading %q ...", config.Source)
		}

		// If we have a specific checkout ref, use submodule update instead of recursive
		// Otherwise the versions will be incorrect.
		if hasRef && hasSubmodules {
			glog.V(2).Infof("Cloning sources (deferring submodule init) into %q", targetSourceDir)
		} else if cloneConfig.Recursive {
			glog.V(2).Infof("Cloning sources and all Git submodules into %q", targetSourceDir)
		} else {
			glog.V(2).Infof("Cloning sources into %q", targetSourceDir)
		}

		if err := c.Clone(config.Source, targetSourceDir, cloneConfig); err != nil {
			glog.V(1).Infof("Git clone failed: %+v", err)
			return nil, err
		}

		if hasRef {
			if err := c.Checkout(targetSourceDir, config.Ref); err != nil {
				return nil, err
			}
			glog.V(1).Infof("Checked out %q", config.Ref)
			if hasSubmodules {
				if err := c.SubmoduleUpdate(targetSourceDir, true, true); err != nil {
					return nil, err
				}
				glog.V(1).Infof("Updated submodules for %q", config.Ref)
			}
		}

		if len(config.ContextDir) > 0 {
			originalTargetDir := filepath.Join(config.WorkingDir, api.Source)
			c.RemoveDirectory(originalTargetDir)
			// we want to copy entire dir contents, thus we need to use dir/. construct
			path := filepath.Join(targetSourceDir, config.ContextDir) + string(filepath.Separator) + "."
			err := c.Copy(path, originalTargetDir)
			if err != nil {
				return nil, err
			}
			info = c.GetInfo(targetSourceDir)
			c.RemoveDirectory(targetSourceDir)
		} else {
			info = c.GetInfo(targetSourceDir)
		}

		if len(config.ContextDir) > 0 {
			info.ContextDir = config.ContextDir
		}

		return info, nil
	}
	// we want to copy entire dir contents, thus we need to use dir/. construct
	path := filepath.Join(config.Source, config.ContextDir) + string(filepath.Separator) + "."
	if !c.Exists(path) {
		return nil, errors.NewSourcePathError(path)
	}
	if err := c.Copy(path, targetSourceDir); err != nil {
		return nil, err
	}

	// When building from a local directory (not using Git clone spec scheme) we
	// skip gathering informations about the source as there is no guarantee that
	// the folder is a Git repository or it requires context-dir to be set.
	if !config.Quiet {
		glog.Warning("You are using <source> location that is not valid Git repository. The source code information will not be stored into the output image. Use this image only for local testing and development.")
	}
	return nil, nil
}
