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package main

import (
	"bytes"
	"fmt"
	"github.com/Masterminds/sprig"
	"gopkg.in/gomail.v2"
	"text/template"
)

type headerData struct {
	name  string
	value []string
}

type headerList []headerData

type recipientData struct {
	field, address, name string
}

type notificationContent struct {
	template   string
	data       interface{}
	subject    string
	headers    headerList
	recipients []recipientData
}

type NotificationMail interface {
	GetNotificationContent() *notificationContent
}

var NotifyMailChannel = make(chan NotificationMail, 1)

func MailNotifier(quitMailNotifier chan int) {
	log.Info("Launched mail notifier")
	for {
		select {
		case notification := <-NotifyMailChannel:
			content := notification.GetNotificationContent()
			mailText, err := buildMail(content.template, content.data)
			if err != nil {
				log.Errorf("building mail failed: %v", err)
				continue
			}

			m := gomail.NewMessage()
			m.SetAddressHeader("From", config.NotificationSenderAddress, "CAcert board voting system")
			for _, recipient := range content.recipients {
				m.SetAddressHeader(recipient.field, recipient.address, recipient.name)
			}
			m.SetHeader("Subject", content.subject)
			for _, header := range content.headers {
				m.SetHeader(header.name, header.value...)
			}
			m.SetBody("text/plain", mailText.String())

			d := gomail.NewPlainDialer(config.MailServer.Host, config.MailServer.Port, "", "")
			if err := d.DialAndSend(m); err != nil {
				log.Errorf("sending mail failed: %v", err)
			}
		case <-quitMailNotifier:
			log.Info("Ending mail notifier")
			return
		}
	}
}

func buildMail(templateName string, context interface{}) (mailText *bytes.Buffer, err error) {
	t, err := template.New(templateName).Funcs(
		sprig.GenericFuncMap()).ParseFiles(fmt.Sprintf("templates/%s", templateName))
	if err != nil {
		return
	}

	mailText = bytes.NewBufferString("")
	if err := t.Execute(mailText, context); err != nil {
		log.Errorf("Failed to execute template %s with context %+v: %v", templateName, context, err)
		return nil, err
	}

	return
}

type notificationBase struct{}

func (n *notificationBase) getRecipient() recipientData {
	return recipientData{field: "To", address: config.NoticeMailAddress, name: "CAcert board mailing list"}
}

type decisionReplyBase struct {
	decision Decision
}

func (n *decisionReplyBase) getHeaders() headerList {
	headers := make(headerList, 0)
	headers = append(headers, headerData{
		name: "References", value: []string{fmt.Sprintf("<%s>", n.decision.Tag)},
	})
	headers = append(headers, headerData{
		name: "In-Reply-To", value: []string{fmt.Sprintf("<%s>", n.decision.Tag)},
	})
	return headers
}

func (n *decisionReplyBase) getSubject() string {
	return fmt.Sprintf("Re: %s - %s", n.decision.Tag, n.decision.Title)
}

type notificationClosedDecision struct {
	notificationBase
	decisionReplyBase
	voteSums  VoteSums
	reasoning string
}

func NewNotificationClosedDecision(decision *Decision, voteSums *VoteSums, reasoning string) NotificationMail {
	notification := &notificationClosedDecision{voteSums: *voteSums, reasoning: reasoning}
	notification.decision = *decision
	return notification
}

func (n *notificationClosedDecision) GetNotificationContent() *notificationContent {
	return &notificationContent{
		template: "closed_motion_mail.txt",
		data: struct {
			*Decision
			*VoteSums
			Reasoning string
		}{&n.decision, &n.voteSums, n.reasoning},
		subject:    fmt.Sprintf("Re: %s - %s - finalised", n.decision.Tag, n.decision.Title),
		headers:    n.decisionReplyBase.getHeaders(),
		recipients: []recipientData{n.notificationBase.getRecipient()},
	}
}

type NotificationCreateMotion struct {
	notificationBase
	decision Decision
	voter    Voter
}

func (n *NotificationCreateMotion) GetNotificationContent() *notificationContent {
	voteURL := fmt.Sprintf("%s/vote/%s", config.BaseURL, n.decision.Tag)
	unvotedURL := fmt.Sprintf("%s/motions/?unvoted=1", config.BaseURL)
	return &notificationContent{
		template: "create_motion_mail.txt",
		data: struct {
			*Decision
			Name       string
			VoteURL    string
			UnvotedURL string
		}{&n.decision, n.voter.Name, voteURL, unvotedURL},
		subject:    fmt.Sprintf("%s - %s", n.decision.Tag, n.decision.Title),
		headers:    headerList{headerData{"Message-ID", []string{fmt.Sprintf("<%s>", n.decision.Tag)}}},
		recipients: []recipientData{n.notificationBase.getRecipient()},
	}
}

type notificationUpdateMotion struct {
	notificationBase
	decisionReplyBase
	voter Voter
}

func NewNotificationUpdateMotion(decision Decision, voter Voter) NotificationMail {
	notification := notificationUpdateMotion{voter: voter}
	notification.decision = decision
	return &notification
}

func (n *notificationUpdateMotion) GetNotificationContent() *notificationContent {
	voteURL := fmt.Sprintf("%s/vote/%s", config.BaseURL, n.decision.Tag)
	unvotedURL := fmt.Sprintf("%s/motions/?unvoted=1", config.BaseURL)
	return &notificationContent{
		template: "update_motion_mail.txt",
		data: struct {
			*Decision
			Name       string
			VoteURL    string
			UnvotedURL string
		}{&n.decision, n.voter.Name, voteURL, unvotedURL},
		subject:    n.decisionReplyBase.getSubject(),
		headers:    n.decisionReplyBase.getHeaders(),
		recipients: []recipientData{n.notificationBase.getRecipient()},
	}
}

type notificationWithDrawMotion struct {
	notificationBase
	decisionReplyBase
	voter Voter
}

func NewNotificationWithDrawMotion(decision *Decision, voter *Voter) NotificationMail {
	notification := &notificationWithDrawMotion{voter: *voter}
	notification.decision = *decision
	return notification
}

func (n *notificationWithDrawMotion) GetNotificationContent() *notificationContent {
	return &notificationContent{
		template: "withdraw_motion_mail.txt",
		data: struct {
			*Decision
			Name string
		}{&n.decision, n.voter.Name},
		subject:    fmt.Sprintf("Re: %s - %s - withdrawn", n.decision.Tag, n.decision.Title),
		headers:    n.decisionReplyBase.getHeaders(),
		recipients: []recipientData{n.notificationBase.getRecipient()},
	}
}

type RemindVoterNotification struct {
	voter     Voter
	decisions []Decision
}

func (n *RemindVoterNotification) GetNotificationContent() *notificationContent {
	return &notificationContent{
		template: "remind_voter_mail.txt",
		data: struct {
			Decisions []Decision
			Name      string
			BaseURL   string
		}{n.decisions, n.voter.Name, config.BaseURL},
		subject:    "Outstanding CAcert board votes",
		recipients: []recipientData{{"To", n.voter.Reminder, n.voter.Name}},
	}
}

type voteNotificationBase struct{}

func (n *voteNotificationBase) getRecipient() recipientData {
	return recipientData{"To", config.VoteNoticeMailAddress, "CAcert board votes mailing list"}
}

type notificationProxyVote struct {
	voteNotificationBase
	decisionReplyBase
	proxy         Voter
	voter         Voter
	vote          Vote
	justification string
}

func NewNotificationProxyVote(decision *Decision, proxy *Voter, voter *Voter, vote *Vote, justification string) NotificationMail {
	notification := &notificationProxyVote{proxy: *proxy, voter: *voter, vote: *vote, justification: justification}
	notification.decision = *decision
	return notification
}

func (n *notificationProxyVote) GetNotificationContent() *notificationContent {
	return &notificationContent{
		template: "proxy_vote_mail.txt",
		data: struct {
			Proxy         string
			Vote          VoteChoice
			Voter         string
			Decision      *Decision
			Justification string
		}{n.proxy.Name, n.vote.Vote, n.voter.Name, &n.decision, n.justification},
		subject:    n.decisionReplyBase.getSubject(),
		headers:    n.decisionReplyBase.getHeaders(),
		recipients: []recipientData{n.voteNotificationBase.getRecipient()},
	}
}

type notificationDirectVote struct {
	voteNotificationBase
	decisionReplyBase
	voter Voter
	vote  Vote
}

func NewNotificationDirectVote(decision *Decision, voter *Voter, vote *Vote) NotificationMail {
	notification := &notificationDirectVote{voter: *voter, vote: *vote}
	notification.decision = *decision
	return notification
}

func (n *notificationDirectVote) GetNotificationContent() *notificationContent {
	return &notificationContent{
		template: "direct_vote_mail.txt",
		data: struct {
			Vote     VoteChoice
			Voter    string
			Decision *Decision
		}{n.vote.Vote, n.voter.Name, &n.decision},
		subject:    n.decisionReplyBase.getSubject(),
		headers:    n.decisionReplyBase.getHeaders(),
		recipients: []recipientData{n.voteNotificationBase.getRecipient()},
	}
}