// 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 api

import (
	"encoding/json"
	"net/http"
	"net/url"

	"github.com/pkg/errors"
	"github.com/sorintlab/agola/internal/db"
	"github.com/sorintlab/agola/internal/services/configstore/command"
	"github.com/sorintlab/agola/internal/services/configstore/common"
	"github.com/sorintlab/agola/internal/services/configstore/readdb"
	"github.com/sorintlab/agola/internal/services/types"
	"github.com/sorintlab/agola/internal/util"

	"github.com/gorilla/mux"
	"go.uber.org/zap"
)

type ProjectHandler struct {
	log    *zap.SugaredLogger
	readDB *readdb.ReadDB
}

func NewProjectHandler(logger *zap.Logger, readDB *readdb.ReadDB) *ProjectHandler {
	return &ProjectHandler{log: logger.Sugar(), readDB: readDB}
}

func (h *ProjectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	projectRef, err := url.PathUnescape(vars["projectref"])
	if err != nil {
		httpError(w, util.NewErrBadRequest(err))
		return
	}

	projectRefType, err := common.ParseRef(projectRef)
	if err != nil {
		httpError(w, util.NewErrBadRequest(err))
		return
	}

	var project *types.Project
	err = h.readDB.Do(func(tx *db.Tx) error {
		var err error
		switch projectRefType {
		case common.RefTypeID:
			project, err = h.readDB.GetProject(tx, projectRef)
		case common.RefTypePath:
			project, err = h.readDB.GetProjectByPath(tx, projectRef)
		}
		return err
	})
	if err != nil {
		h.log.Errorf("err: %+v", err)
		httpError(w, err)
		return
	}

	if project == nil {
		httpError(w, util.NewErrNotFound(errors.Errorf("project %q doesn't exist", projectRef)))
		return
	}

	if err := httpResponse(w, http.StatusOK, project); err != nil {
		h.log.Errorf("err: %+v", err)
	}
}

type CreateProjectHandler struct {
	log    *zap.SugaredLogger
	ch     *command.CommandHandler
	readDB *readdb.ReadDB
}

func NewCreateProjectHandler(logger *zap.Logger, ch *command.CommandHandler) *CreateProjectHandler {
	return &CreateProjectHandler{log: logger.Sugar(), ch: ch}
}

func (h *CreateProjectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	var req types.Project
	d := json.NewDecoder(r.Body)
	if err := d.Decode(&req); err != nil {
		httpError(w, util.NewErrBadRequest(err))
		return
	}

	project, err := h.ch.CreateProject(ctx, &req)
	if httpError(w, err) {
		h.log.Errorf("err: %+v", err)
		return
	}

	if err := httpResponse(w, http.StatusCreated, project); err != nil {
		h.log.Errorf("err: %+v", err)
	}
}

type DeleteProjectHandler struct {
	log *zap.SugaredLogger
	ch  *command.CommandHandler
}

func NewDeleteProjectHandler(logger *zap.Logger, ch *command.CommandHandler) *DeleteProjectHandler {
	return &DeleteProjectHandler{log: logger.Sugar(), ch: ch}
}

func (h *DeleteProjectHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()

	vars := mux.Vars(r)
	projectRef, err := url.PathUnescape(vars["projectref"])
	if err != nil {
		httpError(w, util.NewErrBadRequest(err))
		return
	}

	err = h.ch.DeleteProject(ctx, projectRef)
	if httpError(w, err) {
		h.log.Errorf("err: %+v", err)
	}
	if err := httpResponse(w, http.StatusNoContent, nil); err != nil {
		h.log.Errorf("err: %+v", err)
	}
}

const (
	DefaultProjectsLimit = 10
	MaxProjectsLimit     = 20
)