/*
 * SPDX-FileCopyrightText: 2023 jordi fita mas <jfita@peritasoft.com>
 * SPDX-License-Identifier: AGPL-3.0-only
 */

package page

import (
	"context"
	"net/http"

	"dev.tandem.ws/tandem/camper/pkg/auth"
	"dev.tandem.ws/tandem/camper/pkg/database"
	"dev.tandem.ws/tandem/camper/pkg/form"
	httplib "dev.tandem.ws/tandem/camper/pkg/http"
	"dev.tandem.ws/tandem/camper/pkg/locale"
	"dev.tandem.ws/tandem/camper/pkg/template"
	"dev.tandem.ws/tandem/camper/pkg/uuid"
)

type AdminHandler struct {
}

func NewAdminHandler() *AdminHandler {
	return &AdminHandler{}
}

func (h *AdminHandler) Handler(user *auth.User, company *auth.Company, conn *database.Conn) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		var head string
		head, r.URL.Path = httplib.ShiftPath(r.URL.Path)
		switch head {
		case "new":
			switch r.Method {
			case http.MethodGet:
				f := newPageForm()
				f.MustRender(w, r, user, company)
			default:
				httplib.MethodNotAllowed(w, r, http.MethodGet)
			}
		case "":
			switch r.Method {
			case http.MethodGet:
				servePageIndex(w, r, user, company, conn)
			case http.MethodPost:
				f := newPageForm()
				f.Handle(w, r, user, company, func(ctx context.Context) {
					conn.MustExec(ctx, "select add_page($1, $2, $3)", company.ID, f.Title, f.Content)
				})
			default:
				httplib.MethodNotAllowed(w, r, http.MethodGet, http.MethodPost)
			}
		default:
			if !uuid.Valid(head) {
				http.NotFound(w, r)
				return
			}
			f := newPageForm()
			if err := f.FillFromDatabase(r.Context(), conn, head); err != nil {
				if database.ErrorIsNotFound(err) {
					http.NotFound(w, r)
					return
				}
				panic(err)
			}
			switch r.Method {
			case http.MethodGet:
				f.MustRender(w, r, user, company)
			case http.MethodPut:
				f.Handle(w, r, user, company, func(ctx context.Context) {
					conn.MustExec(ctx, "select edit_page($1, $2, $3)", f.Slug, f.Title, f.Content)
				})
			default:
				httplib.MethodNotAllowed(w, r, http.MethodGet, http.MethodPut)
			}
		}
	})
}

func servePageIndex(w http.ResponseWriter, r *http.Request, user *auth.User, company *auth.Company, conn *database.Conn) {
	pages, err := collectPageEntries(r.Context(), company, conn)
	if err != nil {
		panic(err)
	}
	page := &pageIndex{
		Pages: pages,
	}
	page.MustRender(w, r, user, company)
}

type pageEntry struct {
	Slug  string
	Title string
}

func collectPageEntries(ctx context.Context, company *auth.Company, conn *database.Conn) ([]*pageEntry, error) {
	rows, err := conn.Query(ctx, "select slug, title from page where company_id = $1", company.ID)
	if err != nil {
		return nil, err
	}
	defer rows.Close()

	var types []*pageEntry
	for rows.Next() {
		entry := &pageEntry{}
		if err = rows.Scan(&entry.Slug, &entry.Title); err != nil {
			return nil, err
		}
		types = append(types, entry)
	}

	return types, nil
}

type pageIndex struct {
	Pages []*pageEntry
}

func (index *pageIndex) MustRender(w http.ResponseWriter, r *http.Request, user *auth.User, company *auth.Company) {
	template.MustRenderAdmin(w, r, user, company, "page/index.gohtml", index)
}

type pageForm struct {
	Slug    string
	Title   *form.Input
	Content *form.Input
}

func newPageForm() *pageForm {
	return &pageForm{
		Title: &form.Input{
			Name: "title",
		},
		Content: &form.Input{
			Name: "content",
		},
	}
}

func (f *pageForm) FillFromDatabase(ctx context.Context, conn *database.Conn, slug string) error {
	f.Slug = slug
	row := conn.QueryRow(ctx, "select title, content from page where slug = $1", slug)
	return row.Scan(&f.Title.Val, &f.Content.Val)
}

func (f *pageForm) Parse(r *http.Request) error {
	if err := r.ParseForm(); err != nil {
		return err
	}
	f.Title.FillValue(r)
	f.Content.FillValue(r)
	return nil
}

func (f *pageForm) Valid(l *locale.Locale) bool {
	v := form.NewValidator(l)
	v.CheckRequired(f.Title, l.GettextNoop("Title can not be empty."))
	return v.AllOK
}

func (f *pageForm) MustRender(w http.ResponseWriter, r *http.Request, user *auth.User, company *auth.Company) {
	template.MustRenderAdmin(w, r, user, company, "page/form.gohtml", f)
}

func (f *pageForm) Handle(w http.ResponseWriter, r *http.Request, user *auth.User, company *auth.Company, exec func(ctx context.Context)) {
	if err := f.Parse(r); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}
	if err := user.VerifyCSRFToken(r); err != nil {
		http.Error(w, err.Error(), http.StatusForbidden)
		return
	}
	if !f.Valid(user.Locale) {
		if !httplib.IsHTMxRequest(r) {
			w.WriteHeader(http.StatusUnprocessableEntity)
		}
		f.MustRender(w, r, user, company)
		return
	}
	exec(r.Context())
	httplib.Redirect(w, r, "/admin/pages", http.StatusSeeOther)
}