/*
Copyright 2017-2022 CAcert Inc.
SPDX-License-Identifier: Apache-2.0

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 main

import (
	"html/template"
	"net/http"
	"strings"
	"time"

	"git.cacert.org/cacert-boardvoting/internal/models"
	"github.com/Masterminds/sprig/v3"
	"github.com/gorilla/csrf"
)

const motionsPerPage = 10

func (app *application) motionList(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path != "/motions/" {
		app.notFound(w)

		return
	}

	var err error

	ctx := r.Context()

	listOptions := &models.MotionListOptions{Limit: motionsPerPage}

	const queryParamBefore = "before"
	const queryParamAfter = "after"

	if r.URL.Query().Has(queryParamAfter) {
		var after time.Time

		err := after.UnmarshalText([]byte(r.URL.Query().Get(queryParamAfter)))
		if err != nil {
			app.clientError(w, http.StatusBadRequest)

			return
		}

		listOptions.After = &after
	} else if r.URL.Query().Has(queryParamBefore) {
		var before time.Time

		err := before.UnmarshalText([]byte(r.URL.Query().Get(queryParamBefore)))
		if err != nil {
			app.clientError(w, http.StatusBadRequest)

			return
		}

		listOptions.Before = &before
	}

	motions, err := app.motions.GetMotions(ctx, listOptions)
	if err != nil {
		app.serverError(w, err)

		return
	}

	first, last, err := app.motions.TimestampRange(ctx)
	if err != nil {
		app.serverError(w, err)

		return
	}

	files := []string{
		"./ui/html/base.html",
		"./ui/html/partials/nav.html",
		"./ui/html/partials/pagination.html",
		"./ui/html/partials/motion_actions.html",
		"./ui/html/partials/motion_display.html",
		"./ui/html/partials/motion_status_class.html",
		"./ui/html/pages/motions.html",
	}

	funcMaps := sprig.FuncMap()
	funcMaps["nl2br"] = func(text string) template.HTML {
		// #nosec G203 input is sanitized
		return template.HTML(strings.ReplaceAll(template.HTMLEscapeString(text), "\n", "<br>"))
	}
	funcMaps["canMangageUsers"] = func(*models.Voter) bool {
		return false
	}
	funcMaps[csrf.TemplateTag] = func() template.HTML {
		return csrf.TemplateField(r)
	}

	ts, err := template.New("").Funcs(funcMaps).ParseFiles(files...)
	if err != nil {
		app.serverError(w, err)

		return
	}

	templateCtx := struct {
		Voter   *models.Voter
		Flashes []string
		Params  struct {
			Flags struct {
				Unvoted bool
			}
		}
		PrevPage, NextPage string
		Motions            []*models.MotionForDisplay
	}{Motions: motions}

	if len(motions) > 0 && first.Before(motions[len(motions)-1].Proposed) {
		marshalled, err := motions[len(motions)-1].Proposed.MarshalText()
		if err != nil {
			app.serverError(w, err)

			return
		}

		templateCtx.NextPage = string(marshalled)
	}
	if len(motions) > 0 && last.After(motions[0].Proposed) {
		marshalled, err := motions[0].Proposed.MarshalText()
		if err != nil {
			app.serverError(w, err)

			return
		}

		templateCtx.PrevPage = string(marshalled)
	}

	err = ts.ExecuteTemplate(w, "base", templateCtx)
	if err != nil {
		app.serverError(w, err)
	}
}

func (app *application) home(w http.ResponseWriter, r *http.Request) {
	if r.URL.Path != "/" {
		http.NotFound(w, r)

		return
	}

	if r.Method != "GET" && r.Method != "HEAD" {
		w.Header().Set("Allow", "GET,HEAD")
		app.clientError(w, http.StatusMethodNotAllowed)

		return
	}

	http.Redirect(w, r, "/motions/", http.StatusMovedPermanently)
}