package libpod

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"os"

	"github.com/containers/libpod/libpod"
	"github.com/containers/libpod/pkg/api/handlers"
	"github.com/containers/libpod/pkg/api/handlers/utils"
	"github.com/gorilla/mux"
	"github.com/gorilla/schema"
	"github.com/pkg/errors"
)

// Commit
// author string
// "container"
// repo string
// tag string
// message
// pause bool
// changes []string

// create

func ImageExists(w http.ResponseWriter, r *http.Request) {
	// 200 ok
	// 404 no such
	// 500 internal
	runtime := r.Context().Value("runtime").(*libpod.Runtime)
	name := mux.Vars(r)["name"]

	_, err := runtime.ImageRuntime().NewFromLocal(name)
	if err != nil {
		utils.Error(w, "Something went wrong.", http.StatusNotFound, errors.Wrapf(err, "Failed to find image %s", name))
		return
	}
	utils.WriteResponse(w, http.StatusNoContent, "")
}

func ImageTree(w http.ResponseWriter, r *http.Request) {
	// tree is a bit of a mess ... logic is in adapter and therefore not callable from here. needs rework

	// name := mux.Vars(r)["name"]
	// _, layerInfoMap, _, err := s.Runtime.Tree(name)
	// if err != nil {
	//	Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrapf(err, "Failed to find image information for %q", name))
	//	return
	// }
	//	it is not clear to me how to deal with this given all the processing of the image
	// is in main.  we need to discuss how that really should be and return something useful.
	handlers.UnsupportedHandler(w, r)
}

func GetImage(w http.ResponseWriter, r *http.Request) {
	name := mux.Vars(r)["name"]
	newImage, err := handlers.GetImage(r, name)
	if err != nil {
		utils.Error(w, "Something went wrong.", http.StatusNotFound, errors.Wrapf(err, "Failed to find image %s", name))
		return
	}
	inspect, err := newImage.Inspect(r.Context())
	if err != nil {
		utils.Error(w, "Server error", http.StatusInternalServerError, errors.Wrapf(err, "failed in inspect image %s", inspect.ID))
		return
	}
	utils.WriteResponse(w, http.StatusOK, inspect)

}
func GetImages(w http.ResponseWriter, r *http.Request) {
	images, err := utils.GetImages(w, r)
	if err != nil {
		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "Failed get images"))
		return
	}
	var summaries = make([]*handlers.ImageSummary, len(images))
	for j, img := range images {
		is, err := handlers.ImageToImageSummary(img)
		if err != nil {
			utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "Failed transform image summaries"))
			return
		}
		// libpod has additional fields that we need to populate.
		is.CreatedTime = img.Created()
		is.ReadOnly = img.IsReadOnly()
		summaries[j] = is
	}
	utils.WriteResponse(w, http.StatusOK, summaries)
}

func PruneImages(w http.ResponseWriter, r *http.Request) {
	// 200 ok
	// 500 internal
	runtime := r.Context().Value("runtime").(*libpod.Runtime)
	decoder := r.Context().Value("decoder").(*schema.Decoder)
	query := struct {
		All     bool                `schema:"all"`
		Filters map[string][]string `schema:"filters"`
	}{
		// override any golang type defaults
	}

	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
			errors.Wrapf(err, "Failed to parse parameters for %s", r.URL.String()))
		return
	}

	var libpodFilters = []string{}
	if _, found := r.URL.Query()["filters"]; found {
		for k, v := range query.Filters {
			libpodFilters = append(libpodFilters, fmt.Sprintf("%s=%s", k, v[0]))
		}
	}
	cids, err := runtime.ImageRuntime().PruneImages(r.Context(), query.All, libpodFilters)
	if err != nil {
		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, err)
		return
	}
	utils.WriteResponse(w, http.StatusOK, cids)
}

func ExportImage(w http.ResponseWriter, r *http.Request) {
	runtime := r.Context().Value("runtime").(*libpod.Runtime)
	decoder := r.Context().Value("decoder").(*schema.Decoder)
	query := struct {
		Compress bool   `schema:"compress"`
		Format   string `schema:"format"`
	}{
		// override any golang type defaults
	}

	if err := decoder.Decode(&query, r.URL.Query()); err != nil {
		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest,
			errors.Wrapf(err, "Failed to parse parameters for %s", r.URL.String()))
		return
	}

	if len(query.Format) < 1 {
		utils.InternalServerError(w, errors.New("format parameter cannot be empty."))
		return
	}

	tmpfile, err := ioutil.TempFile("", "api.tar")
	if err != nil {
		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to create tempfile"))
		return
	}
	if err := tmpfile.Close(); err != nil {
		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "unable to close tempfile"))
		return
	}
	name := mux.Vars(r)["name"]
	newImage, err := runtime.ImageRuntime().NewFromLocal(name)
	if err != nil {
		utils.ImageNotFound(w, name, err)
		return
	}
	if err := newImage.Save(r.Context(), name, query.Format, tmpfile.Name(), []string{}, false, query.Compress); err != nil {
		utils.Error(w, http.StatusText(http.StatusBadRequest), http.StatusBadRequest, err)
		return
	}
	rdr, err := os.Open(tmpfile.Name())
	if err != nil {
		utils.Error(w, "Something went wrong.", http.StatusInternalServerError, errors.Wrap(err, "failed to read the exported tarfile"))
		return
	}
	defer rdr.Close()
	defer os.Remove(tmpfile.Name())
	utils.WriteResponse(w, http.StatusOK, rdr)
}