// Copyright 2017 Frédéric Guillot. All rights reserved.
// Use of this source code is governed by the Apache 2.0
// license that can be found in the LICENSE file.

package api // import "miniflux.app/api"

import (
	"errors"
	"net/http"
	"time"

	"miniflux.app/http/request"
	"miniflux.app/http/response/json"
	feedHandler "miniflux.app/reader/handler"
)

func (h *handler) createFeed(w http.ResponseWriter, r *http.Request) {
	feedInfo, err := decodeFeedCreationRequest(r.Body)
	if err != nil {
		json.BadRequest(w, r, err)
		return
	}

	if feedInfo.FeedURL == "" {
		json.BadRequest(w, r, errors.New("The feed_url is required"))
		return
	}

	if feedInfo.CategoryID <= 0 {
		json.BadRequest(w, r, errors.New("The category_id is required"))
		return
	}

	userID := request.UserID(r)

	if h.store.FeedURLExists(userID, feedInfo.FeedURL) {
		json.BadRequest(w, r, errors.New("This feed_url already exists"))
		return
	}

	if !h.store.CategoryExists(userID, feedInfo.CategoryID) {
		json.BadRequest(w, r, errors.New("This category_id doesn't exists or doesn't belongs to this user"))
		return
	}

	feed, err := feedHandler.CreateFeed(h.store, &feedHandler.FeedCreationArgs{
		UserID:          userID,
		CategoryID:      feedInfo.CategoryID,
		FeedURL:         feedInfo.FeedURL,
		UserAgent:       feedInfo.UserAgent,
		Username:        feedInfo.Username,
		Password:        feedInfo.Password,
		Crawler:         feedInfo.Crawler,
		Disabled:        feedInfo.Disabled,
		IgnoreHTTPCache: feedInfo.IgnoreHTTPCache,
		FetchViaProxy:   feedInfo.FetchViaProxy,
		ScraperRules:    feedInfo.ScraperRules,
		RewriteRules:    feedInfo.RewriteRules,
		BlocklistRules:  feedInfo.BlocklistRules,
		KeeplistRules:   feedInfo.KeeplistRules,
	})
	if err != nil {
		json.ServerError(w, r, err)
		return
	}

	json.Created(w, r, &feedCreationResponse{FeedID: feed.ID})
}

func (h *handler) refreshFeed(w http.ResponseWriter, r *http.Request) {
	feedID := request.RouteInt64Param(r, "feedID")
	userID := request.UserID(r)

	if !h.store.FeedExists(userID, feedID) {
		json.NotFound(w, r)
		return
	}

	err := feedHandler.RefreshFeed(h.store, userID, feedID)
	if err != nil {
		json.ServerError(w, r, err)
		return
	}

	json.NoContent(w, r)
}

func (h *handler) refreshAllFeeds(w http.ResponseWriter, r *http.Request) {
	userID := request.UserID(r)
	jobs, err := h.store.NewUserBatch(userID, h.store.CountFeeds(userID))
	if err != nil {
		json.ServerError(w, r, err)
		return
	}

	go func() {
		h.pool.Push(jobs)
	}()

	json.NoContent(w, r)
}

func (h *handler) updateFeed(w http.ResponseWriter, r *http.Request) {
	feedID := request.RouteInt64Param(r, "feedID")
	feedChanges, err := decodeFeedModificationRequest(r.Body)
	if err != nil {
		json.BadRequest(w, r, err)
		return
	}

	userID := request.UserID(r)

	originalFeed, err := h.store.FeedByID(userID, feedID)
	if err != nil {
		json.NotFound(w, r)
		return
	}

	if originalFeed == nil {
		json.NotFound(w, r)
		return
	}

	feedChanges.Update(originalFeed)

	if !h.store.CategoryExists(userID, originalFeed.Category.ID) {
		json.BadRequest(w, r, errors.New("This category_id doesn't exists or doesn't belongs to this user"))
		return
	}

	if err := h.store.UpdateFeed(originalFeed); err != nil {
		json.ServerError(w, r, err)
		return
	}

	originalFeed, err = h.store.FeedByID(userID, feedID)
	if err != nil {
		json.ServerError(w, r, err)
		return
	}

	json.Created(w, r, originalFeed)
}

func (h *handler) markFeedAsRead(w http.ResponseWriter, r *http.Request) {
	feedID := request.RouteInt64Param(r, "feedID")
	userID := request.UserID(r)

	feed, err := h.store.FeedByID(userID, feedID)
	if err != nil {
		json.NotFound(w, r)
		return
	}

	if feed == nil {
		json.NotFound(w, r)
		return
	}

	if err := h.store.MarkFeedAsRead(userID, feedID, time.Now()); err != nil {
		json.ServerError(w, r, err)
		return
	}

	json.NoContent(w, r)
}

func (h *handler) getFeeds(w http.ResponseWriter, r *http.Request) {
	feeds, err := h.store.Feeds(request.UserID(r))
	if err != nil {
		json.ServerError(w, r, err)
		return
	}

	json.OK(w, r, feeds)
}

func (h *handler) getFeed(w http.ResponseWriter, r *http.Request) {
	feedID := request.RouteInt64Param(r, "feedID")
	feed, err := h.store.FeedByID(request.UserID(r), feedID)
	if err != nil {
		json.ServerError(w, r, err)
		return
	}

	if feed == nil {
		json.NotFound(w, r)
		return
	}

	json.OK(w, r, feed)
}

func (h *handler) removeFeed(w http.ResponseWriter, r *http.Request) {
	feedID := request.RouteInt64Param(r, "feedID")
	userID := request.UserID(r)

	if !h.store.FeedExists(userID, feedID) {
		json.NotFound(w, r)
		return
	}

	if err := h.store.RemoveFeed(userID, feedID); err != nil {
		json.ServerError(w, r, err)
		return
	}

	json.NoContent(w, r)
}