// Package models defines all shared data structures.
package models

import "time"

// ---- Domain & User ----

type Domain struct {
	ID            int64
	Name          string
	Enabled       bool
	DKIMPrivateEnc []byte // AES-256-GCM encrypted PEM private key
	DKIMPublic    string // PEM public key (not secret)
	DKIMSelector  string
	DKIMAlgo      string // rsa2048 | ed25519
	SPFPolicy     string // stored for reference
	DMARCPolicy   string // stored for reference
	MaxUsers      int
	MaxQuotaBytes int64
	CreatedAt     time.Time
}

type User struct {
	ID             int64
	DomainID       int64
	Username       string // local part (before @)
	Email          string // full address
	PasswordHash   string // bcrypt
	DisplayName    string
	QuotaBytes     int64
	UsedBytes      int64
	Enabled        bool
	Admin          bool // global admin
	DomainAdmin    bool // admin of own domain only
	MFASecretEnc   []byte // encrypted TOTP secret; nil = MFA disabled
	MFAEnabled     bool
	RecoveryCodesEnc []byte // encrypted JSON array of one-time codes
	CreatedAt      time.Time
	LastLogin      time.Time
}

type UserAlias struct {
	ID         int64
	UserID     int64
	AliasEmail string
}

// ---- Mail storage ----

// MailboxType canonical values.
const (
	MailboxInbox   = "inbox"
	MailboxSent    = "sent"
	MailboxDrafts  = "drafts"
	MailboxTrash   = "trash"
	MailboxSpam    = "spam"
	MailboxArchive = "archive"
	MailboxCustom  = "custom"
)

type Mailbox struct {
	ID          int64
	UserID      int64
	Name        string // IMAP mailbox name (e.g. "INBOX", "Sent", "Folder/Sub")
	Type        string // MailboxInbox … MailboxCustom
	ParentID    *int64
	UIDValidity uint32
	UIDNext     uint32
	Subscribed  bool
	CreatedAt   time.Time
}

type Message struct {
	ID            int64
	MailboxID     int64
	UID           uint32
	MessageID     string // RFC 2822 Message-ID header (not encrypted — needed for threading)
	Subject       string // plaintext for list/search (consider sensitivity vs usability)
	FromEmail     string
	FromName      string
	ToList        string // comma-separated
	CCList        string
	BCCList       string
	ReplyTo       string
	Date          time.Time
	BodyTextEnc   []byte // AES-256-GCM encrypted text/plain
	BodyHTMLEnc   []byte // AES-256-GCM encrypted text/html
	RawEnc        []byte // AES-256-GCM encrypted full RFC822 message
	SizeBytes     int64
	HasAttachment bool
	IsRead        bool
	IsStarred     bool
	IsDraft       bool
	Flags         string // raw IMAP flags string
	SpamScore     int
	ReceivedAt    time.Time
	DeletedAt     *time.Time // soft delete; nil = not deleted
}

type Attachment struct {
	ID          int64
	MessageID   int64
	Filename    string
	ContentType string
	SizeBytes   int64
	DataEnc     []byte // AES-256-GCM encrypted bytes (or nil if fs-backed)
	DataPath    string // filesystem path (if STORAGE_BACKEND=fs)
	ContentID   string // MIME Content-ID for inline images
	Inline      bool
	MIMEPath    string // dot-separated MIME section path e.g. "1.2"
}

// ---- Delivery queue ----

const (
	QueuePending   = "pending"
	QueueSending   = "sending"
	QueueDelivered = "delivered"
	QueueFailed    = "failed"
	QueueBounced   = "bounced"
)

type QueueEntry struct {
	ID          int64
	DomainID    int64
	FromAddr    string
	ToAddr      string
	RawEnc      []byte // encrypted RFC822
	MessageID   string
	Status      string // QueuePending … QueueBounced
	Attempts    int
	LastAttempt *time.Time
	NextAttempt time.Time
	ErrorLog    string
	CreatedAt   time.Time
	ExpiresAt   time.Time
}

type DeliveryLog struct {
	ID          int64
	QueueID     int64
	FromAddr    string
	ToAddr      string
	Status      string
	SMTPCode    int
	SMTPMessage string
	MXHost      string
	CreatedAt   time.Time
}

// ---- Sessions & Security ----

type Session struct {
	ID        int64
	UserID    int64
	TokenHash string // SHA-256 hex of the raw bearer token
	IP        string
	UserAgent string
	CreatedAt time.Time
	ExpiresAt time.Time
}

type IPBan struct {
	ID         int64
	IP         string
	Reason     string
	BannedAt   time.Time
	ExpiresAt  *time.Time // nil = permanent
	ReleasedBy string
}

type LoginAttempt struct {
	ID        int64
	IP        string
	UserEmail string
	Success   bool
	CreatedAt time.Time
}

type SecurityEvent struct {
	ID        int64
	Type      string // brute_ban | auth_fail | relay_attempt | etc.
	IP        string
	UserID    *int64
	Detail    string
	CreatedAt time.Time
}

// ---- External accounts (Gmail / Outlook / custom IMAP) ----

const (
	ProviderGmail    = "gmail"
	ProviderOutlook  = "outlook"
	ProviderCustom   = "custom"
)

type ExternalAccount struct {
	ID               int64
	UserID           int64
	Provider         string // ProviderGmail | ProviderOutlook | ProviderCustom
	EmailAddress     string
	DisplayName      string
	AccessTokenEnc   []byte // encrypted OAuth2 or password
	RefreshTokenEnc  []byte // encrypted OAuth2 refresh token
	TokenExpiry      time.Time
	IMAPHost         string
	IMAPPort         int
	SMTPHost         string
	SMTPPort         int
	Enabled          bool
	SyncEnabled      bool
	LastSync         time.Time
	CreatedAt        time.Time
}

// ---- Contacts (CardDAV) ----

type AddressBook struct {
	ID          int64
	UserID      int64
	Name        string
	Description string
	Color       string
	SyncToken   int64
	CreatedAt   time.Time
}

type Contact struct {
	ID            int64
	AddressBookID int64
	UID           string
	VCardEnc      []byte // AES-256-GCM encrypted vCard 3.0/4.0
	ETag          string // hex(sha256(raw vcard)) — for sync
	CreatedAt     time.Time
	UpdatedAt     time.Time
}

// ---- Calendar (CalDAV) ----

type Calendar struct {
	ID          int64
	UserID      int64
	Name        string
	Description string
	Color       string
	Timezone    string
	SyncToken   int64
	CreatedAt   time.Time
}

type CalendarEvent struct {
	ID         int64
	CalendarID int64
	UID        string
	ICalEnc    []byte // AES-256-GCM encrypted iCalendar data
	ETag       string // hex(sha256(raw ical))
	DTStart    time.Time
	DTEnd      time.Time
	Summary    string // plaintext for calendar grid display
	Recurring  bool
	CreatedAt  time.Time
	UpdatedAt  time.Time
}

// ---- Spam / Bayesian ----

type SpamToken struct {
	ID        int64
	UserID    int64
	Token     string
	SpamCount int64
	HamCount  int64
}

// ---- Compose helpers (not persisted directly) ----

type Attachment_Upload struct {
	Filename    string
	ContentType string
	Data        []byte
}

type ComposeRequest struct {
	AccountID   int64  // 0 = local account, >0 = external account ID
	FromEmail   string
	To          []string
	CC          []string
	BCC         []string
	Subject     string
	BodyText    string
	BodyHTML    string
	Attachments []Attachment_Upload
	InReplyTo   string
	References  string
}