// Vikunja is a to-do list application to facilitate your life.
// Copyright 2018-present Vikunja and contributors. All rights reserved.
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public Licensee as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public Licensee for more details.
//
// You should have received a copy of the GNU Affero General Public Licensee
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

package models

import (
	"sort"
	"strconv"
	"time"

	"code.vikunja.io/api/pkg/utils"

	"code.vikunja.io/api/pkg/config"
	"code.vikunja.io/api/pkg/notifications"
	"code.vikunja.io/api/pkg/user"
)

// ReminderDueNotification represents a ReminderDueNotification notification
type ReminderDueNotification struct {
	User    *user.User `json:"user,omitempty"`
	Task    *Task      `json:"task"`
	Project *Project   `json:"project"`
}

// ToMail returns the mail notification for ReminderDueNotification
func (n *ReminderDueNotification) ToMail() *notifications.Mail {
	return notifications.NewMail().
		To(n.User.Email).
		Subject(`Recordatorio para "`+n.Task.Title+`" (`+n.Project.Title+`)`).
		Greeting("Hola "+n.User.GetName()+",").
		Line(`Este es un amigable recordatorio de la tarea "`+n.Task.Title+`" (`+n.Project.Title+`).`).
		Action("Abrir Tarea", config.ServicePublicURL.GetString()+"tasks/"+strconv.FormatInt(n.Task.ID, 10)).
		Line("¡Qué tengas un buen día!")
}

// ToDB returns the ReminderDueNotification notification in a format which can be saved in the db
func (n *ReminderDueNotification) ToDB() interface{} {
	return &ReminderDueNotification{
		Task:    n.Task,
		Project: n.Project,
	}
}

// Name returns the name of the notification
func (n *ReminderDueNotification) Name() string {
	return "task.reminder"
}

// TaskCommentNotification represents a TaskCommentNotification notification
type TaskCommentNotification struct {
	Doer      *user.User   `json:"doer"`
	Task      *Task        `json:"task"`
	Comment   *TaskComment `json:"comment"`
	Mentioned bool         `json:"mentioned"`
}

func (n *TaskCommentNotification) SubjectID() int64 {
	return n.Comment.ID
}

// ToMail returns the mail notification for TaskCommentNotification
func (n *TaskCommentNotification) ToMail() *notifications.Mail {

	mail := notifications.NewMail().
		From(n.Doer.GetNameAndFromEmail()).
		Subject("Re: " + n.Task.Title)

	if n.Mentioned {
		mail.
			Line("**" + n.Doer.GetName() + "** te mencionó en un comentario:").
			Subject(n.Doer.GetName() + ` the mencionó en un comentario de la tarea "` + n.Task.Title + `"`)
	}

	mail.HTML(n.Comment.Comment)

	return mail.
		Action("Ver Tarea", n.Task.GetFrontendURL())
}

// ToDB returns the TaskCommentNotification notification in a format which can be saved in the db
func (n *TaskCommentNotification) ToDB() interface{} {
	return n
}

// Name returns the name of the notification
func (n *TaskCommentNotification) Name() string {
	return "task.comment"
}

// TaskAssignedNotification represents a TaskAssignedNotification notification
type TaskAssignedNotification struct {
	Doer     *user.User `json:"doer"`
	Task     *Task      `json:"task"`
	Assignee *user.User `json:"assignee"`
	Target   *user.User `json:"-"`
}

// ToMail returns the mail notification for TaskAssignedNotification
func (n *TaskAssignedNotification) ToMail() *notifications.Mail {
	if n.Target.ID == n.Assignee.ID {
		return notifications.NewMail().
			Subject("Has sido asignado a "+n.Task.Title+"("+n.Task.GetFullIdentifier()+")").
			Line(n.Doer.GetName()+" te ha asignado a la tarea "+n.Task.Title+".").
			Action("Ver Tarea", n.Task.GetFrontendURL())
	}

	return notifications.NewMail().
		Subject(n.Task.Title+"("+n.Task.GetFullIdentifier()+")"+" ha sido asignado a "+n.Assignee.GetName()).
		Line(n.Doer.GetName()+" ha asignado esta tarea a "+n.Assignee.GetName()+".").
		Action("Ver Tarea", n.Task.GetFrontendURL())
}

// ToDB returns the TaskAssignedNotification notification in a format which can be saved in the db
func (n *TaskAssignedNotification) ToDB() interface{} {
	return n
}

// Name returns the name of the notification
func (n *TaskAssignedNotification) Name() string {
	return "task.assigned"
}

// TaskDeletedNotification represents a TaskDeletedNotification notification
type TaskDeletedNotification struct {
	Doer *user.User `json:"doer"`
	Task *Task      `json:"task"`
}

// ToMail returns the mail notification for TaskDeletedNotification
func (n *TaskDeletedNotification) ToMail() *notifications.Mail {
	return notifications.NewMail().
		Subject(n.Task.Title + " (" + n.Task.GetFullIdentifier() + ")" + " ha sido borrado").
		Line(n.Doer.GetName() + " ha borrado la tarea " + n.Task.Title + " (" + n.Task.GetFullIdentifier() + ")")
}

// ToDB returns the TaskDeletedNotification notification in a format which can be saved in the db
func (n *TaskDeletedNotification) ToDB() interface{} {
	return n
}

// Name returns the name of the notification
func (n *TaskDeletedNotification) Name() string {
	return "task.deleted"
}

// ProjectCreatedNotification represents a ProjectCreatedNotification notification
type ProjectCreatedNotification struct {
	Doer    *user.User `json:"doer"`
	Project *Project   `json:"project"`
}

// ToMail returns the mail notification for ProjectCreatedNotification
func (n *ProjectCreatedNotification) ToMail() *notifications.Mail {
	return notifications.NewMail().
		Subject(n.Doer.GetName()+` creó el proyecto "`+n.Project.Title+`"`).
		Line(n.Doer.GetName()+` creó el proyecto "`+n.Project.Title+`"`).
		Action("Ver Proyecto", config.ServicePublicURL.GetString()+"projects/")
}

// ToDB returns the ProjectCreatedNotification notification in a format which can be saved in the db
func (n *ProjectCreatedNotification) ToDB() interface{} {
	return n
}

// Name returns the name of the notification
func (n *ProjectCreatedNotification) Name() string {
	return "project.created"
}

// TeamMemberAddedNotification represents a TeamMemberAddedNotification notification
type TeamMemberAddedNotification struct {
	Member *user.User `json:"member"`
	Doer   *user.User `json:"doer"`
	Team   *Team      `json:"team"`
}

// ToMail returns the mail notification for TeamMemberAddedNotification
func (n *TeamMemberAddedNotification) ToMail() *notifications.Mail {
	return notifications.NewMail().
		Subject(n.Doer.GetName()+" te añadió al equipo "+n.Team.Name).
		From(n.Doer.GetNameAndFromEmail()).
		Greeting("Hi "+n.Member.GetName()+",").
		Line(n.Doer.GetName()+" te acaba de añadir al equipo "+n.Team.Name+".").
		Action("Ver Equipo", config.ServicePublicURL.GetString()+"teams/"+strconv.FormatInt(n.Team.ID, 10)+"/edit")
}

// ToDB returns the TeamMemberAddedNotification notification in a format which can be saved in the db
func (n *TeamMemberAddedNotification) ToDB() interface{} {
	return n
}

// Name returns the name of the notification
func (n *TeamMemberAddedNotification) Name() string {
	return "team.member.added"
}

// UndoneTaskOverdueNotification represents a UndoneTaskOverdueNotification notification
type UndoneTaskOverdueNotification struct {
	User    *user.User
	Task    *Task
	Project *Project
}

// ToMail returns the mail notification for UndoneTaskOverdueNotification
func (n *UndoneTaskOverdueNotification) ToMail() *notifications.Mail {
	until := time.Until(n.Task.DueDate).Round(1*time.Hour) * -1
	return notifications.NewMail().
		Subject(`La tarea "`+n.Task.Title+`" (`+n.Project.Title+`) está vencida`).
		Greeting("Hola "+n.User.GetName()+",").
		Line(`Este es un recordatorio amigable de que la tarea "`+n.Task.Title+`" (`+n.Project.Title+`) está vencida desde `+utils.HumanizeDuration(until)+` y aún no está completada.`).
		Action("Abrir Tarea", config.ServicePublicURL.GetString()+"tasks/"+strconv.FormatInt(n.Task.ID, 10)).
		Line("¡Qué tengas un buen día!")
}

// ToDB returns the UndoneTaskOverdueNotification notification in a format which can be saved in the db
func (n *UndoneTaskOverdueNotification) ToDB() interface{} {
	return nil
}

// Name returns the name of the notification
func (n *UndoneTaskOverdueNotification) Name() string {
	return "task.undone.overdue"
}

// UndoneTasksOverdueNotification represents a UndoneTasksOverdueNotification notification
type UndoneTasksOverdueNotification struct {
	User     *user.User
	Tasks    map[int64]*Task
	Projects map[int64]*Project
}

// ToMail returns the mail notification for UndoneTasksOverdueNotification
func (n *UndoneTasksOverdueNotification) ToMail() *notifications.Mail {

	sortedTasks := make([]*Task, 0, len(n.Tasks))
	for _, task := range n.Tasks {
		sortedTasks = append(sortedTasks, task)
	}

	sort.Slice(sortedTasks, func(i, j int) bool {
		return sortedTasks[i].DueDate.Before(sortedTasks[j].DueDate)
	})

	overdueLine := ""
	for _, task := range sortedTasks {
		until := time.Until(task.DueDate).Round(1*time.Hour) * -1
		overdueLine += `* [` + task.Title + `](` + config.ServicePublicURL.GetString() + "tasks/" + strconv.FormatInt(task.ID, 10) + `) (` + n.Projects[task.ProjectID].Title + `), vencida desde ` + utils.HumanizeDuration(until) + "\n"
	}

	return notifications.NewMail().
		Subject(`Tus tareas vencidas`).
		Greeting("Hola "+n.User.GetName()+",").
		Line("Tienes las siguientes tareas vencidas:").
		Line(overdueLine).
		Action("Abrir Tareas", config.ServicePublicURL.GetString()).
		Line("¡Qué tengas un buen día!")
}

// ToDB returns the UndoneTasksOverdueNotification notification in a format which can be saved in the db
func (n *UndoneTasksOverdueNotification) ToDB() interface{} {
	return nil
}

// Name returns the name of the notification
func (n *UndoneTasksOverdueNotification) Name() string {
	return "task.undone.overdue"
}

// UserMentionedInTaskNotification represents a UserMentionedInTaskNotification notification
type UserMentionedInTaskNotification struct {
	Doer  *user.User `json:"doer"`
	Task  *Task      `json:"task"`
	IsNew bool       `json:"is_new"`
}

func (n *UserMentionedInTaskNotification) SubjectID() int64 {
	return n.Task.ID
}

// ToMail returns the mail notification for UserMentionedInTaskNotification
func (n *UserMentionedInTaskNotification) ToMail() *notifications.Mail {
	subject := n.Doer.GetName() + ` te mencionó en la nueva tarea "` + n.Task.Title + `"`
	if n.IsNew {
		subject = n.Doer.GetName() + ` te mencionó en la tarea "` + n.Task.Title + `"`
	}

	mail := notifications.NewMail().
		From(n.Doer.GetNameAndFromEmail()).
		Subject(subject).
		Line("**" + n.Doer.GetName() + "** te mencionó en la tarea:").
		HTML(n.Task.Description)

	return mail.
		Action("Ver Tarea", n.Task.GetFrontendURL())
}

// ToDB returns the UserMentionedInTaskNotification notification in a format which can be saved in the db
func (n *UserMentionedInTaskNotification) ToDB() interface{} {
	return n
}

// Name returns the name of the notification
func (n *UserMentionedInTaskNotification) Name() string {
	return "task.mentioned"
}

// DataExportReadyNotification represents a DataExportReadyNotification notification
type DataExportReadyNotification struct {
	User *user.User `json:"user"`
}

// ToMail returns the mail notification for DataExportReadyNotification
func (n *DataExportReadyNotification) ToMail() *notifications.Mail {
	return notifications.NewMail().
		Subject("Tus datos exportados están listos").
		Greeting("Hola "+n.User.GetName()+",").
		Line("Tus datos exportados están listos para descargar. Oprime el siguiente botón para descargarlos:").
		Action("Descargar", config.ServicePublicURL.GetString()+"user/export/download").
		Line("La descarga estará disponible por los siguientes 7 días.").
		Line("¡Qué tengas un buen día!")
}

// ToDB returns the DataExportReadyNotification notification in a format which can be saved in the db
func (n *DataExportReadyNotification) ToDB() interface{} {
	return nil
}

// Name returns the name of the notification
func (n *DataExportReadyNotification) Name() string {
	return "data.export.ready"
}