// Copyright 2018 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 ui

import (
	"net/http"

	"github.com/miniflux/miniflux/http/context"
	"github.com/miniflux/miniflux/http/request"
	"github.com/miniflux/miniflux/http/response/html"
	"github.com/miniflux/miniflux/http/route"
	"github.com/miniflux/miniflux/model"
	"github.com/miniflux/miniflux/ui/session"
	"github.com/miniflux/miniflux/ui/view"
)

// ShowReadEntry shows a single feed entry in "history" mode.
func (c *Controller) ShowReadEntry(w http.ResponseWriter, r *http.Request) {
	ctx := context.New(r)

	user, err := c.store.UserByID(ctx.UserID())
	if err != nil {
		html.ServerError(w, err)
		return
	}

	entryID, err := request.IntParam(r, "entryID")
	if err != nil {
		html.BadRequest(w, err)
		return
	}

	builder := c.store.NewEntryQueryBuilder(user.ID)
	builder.WithEntryID(entryID)
	builder.WithoutStatus(model.EntryStatusRemoved)

	entry, err := builder.GetEntry()
	if err != nil {
		html.ServerError(w, err)
		return
	}

	if entry == nil {
		html.NotFound(w)
		return
	}

	builder = c.store.NewEntryQueryBuilder(user.ID)
	builder.WithStatus(model.EntryStatusRead)

	prevEntry, nextEntry, err := c.getEntryPrevNext(user, builder, entry.ID)
	if err != nil {
		html.ServerError(w, err)
		return
	}

	nextEntryRoute := ""
	if nextEntry != nil {
		nextEntryRoute = route.Path(c.router, "readEntry", "entryID", nextEntry.ID)
	}

	prevEntryRoute := ""
	if prevEntry != nil {
		prevEntryRoute = route.Path(c.router, "readEntry", "entryID", prevEntry.ID)
	}

	sess := session.New(c.store, ctx)
	view := view.New(c.tpl, ctx, sess)
	view.Set("entry", entry)
	view.Set("prevEntry", prevEntry)
	view.Set("nextEntry", nextEntry)
	view.Set("nextEntryRoute", nextEntryRoute)
	view.Set("prevEntryRoute", prevEntryRoute)
	view.Set("menu", "history")
	view.Set("user", user)
	view.Set("countUnread", c.store.CountUnreadEntries(user.ID))

	html.OK(w, view.Render("entry"))
}