package tui

import (
	calendar "github.com/floatpane/go-icalendar"
	"github.com/floatpane/matcha/backend"
	"github.com/floatpane/matcha/config"
	"github.com/floatpane/matcha/daemonrpc"
	"github.com/floatpane/matcha/fetcher"
)

type MailboxKind string

const (
	MailboxInbox   MailboxKind = "inbox"
	MailboxSent    MailboxKind = "sent"
	MailboxTrash   MailboxKind = "trash"
	MailboxArchive MailboxKind = "archive"
)

type ViewEmailMsg struct {
	Index     int
	UID       uint32
	AccountID string
	Mailbox   MailboxKind
	Email     *fetcher.Email
}

type SendEmailMsg struct {
	To              string
	Cc              string // Cc recipient(s)
	Bcc             string // Bcc recipient(s)
	Subject         string
	Body            string
	AttachmentPaths []string
	InReplyTo       string
	References      []string
	AccountID       string // ID of the account to send from
	FromOverride    string // Custom From address (used when account is catch-all)
	QuotedText      string // Hidden quoted text appended when sending
	Signature       string // Signature to append to email body
	SignSMIME       bool   // Whether to sign the email using S/MIME
	EncryptSMIME    bool   // Whether to encrypt the email using S/MIME
	SignPGP         bool   // Whether to sign the email using PGP
}

type EmailQueuedMsg struct {
	JobID        string
	DelaySeconds int
}

type EmailDelayExpiredMsg struct {
	JobID string
}

type UndoSendMsg struct {
	JobID string
}

// ActionGracePeriodExpiredMsg is fired when the undo grace period for a delete/archive/move expires.
type ActionGracePeriodExpiredMsg struct {
	JobID string
}

type Credentials struct {
	Provider     string
	Name         string
	Host         string // Host (this was the previous "Email Address" field in the UI)
	FetchEmail   string // Single email address to fetch messages for. If empty, code should default this to Host when creating the account.
	SendAsEmail  string // Optional From header email. If empty, sending falls back to FetchEmail, then Host.
	CatchAll     bool   // Show all inbox messages regardless of To address.
	Password     string
	IMAPServer   string
	IMAPPort     int
	SMTPServer   string
	SMTPPort     int
	Insecure     bool
	AuthMethod   string // "password" or "oauth2"
	Protocol     string // "imap" (default), "jmap", or "pop3"
	JMAPEndpoint string // JMAP session URL
	POP3Server   string // POP3 server hostname
	POP3Port     int    // POP3 server port
	MaildirPath  string // Local Maildir root
}

// StartOAuth2Msg is sent when the user requests OAuth2 authorization for a Gmail account.
type StartOAuth2Msg struct {
	Email string
}

// OAuth2CompleteMsg is sent when OAuth2 authorization completes.
type OAuth2CompleteMsg struct {
	Email string
	Err   error
}

type ChooseServiceMsg struct {
	Service string
}

type EmailResultMsg struct {
	Err error
}

type ClearStatusMsg struct{}

type EmailsFetchedMsg struct {
	Emails    []fetcher.Email
	AccountID string
	Mailbox   MailboxKind
}

type UpdatePreviewMsg struct {
	UID       uint32
	AccountID string
}

type PreviewBodyFetchedMsg struct {
	UID          uint32
	AccountID    string
	Body         string
	BodyMIMEType string
	Attachments  []fetcher.Attachment
	Err          error
}

type FetchErr error

type SearchRequestedMsg struct {
	Query      backend.SearchQuery
	Mailbox    MailboxKind
	FolderName string
	AccountID  string
}

type SearchResultsMsg struct {
	Query  backend.SearchQuery
	Emails []fetcher.Email
	Err    error
}

type ApplySearchResultsMsg struct {
	Query  backend.SearchQuery
	Emails []fetcher.Email
}

type GoToInboxMsg struct{}

type GoToSentInboxMsg struct{}

type GoToSendMsg struct {
	To      string
	Subject string
	Body    string
}

type GoToSettingsMsg struct{}

type GoToTrashArchiveMsg struct{}

type GoToSignatureEditorMsg struct {
	AccountID string
}

type FetchMoreEmailsMsg struct {
	Offset    uint32
	AccountID string
	Mailbox   MailboxKind
	Limit     uint32
}

type FetchingMoreEmailsMsg struct{}

type EmailsAppendedMsg struct {
	Emails    []fetcher.Email
	AccountID string
	Mailbox   MailboxKind
}

type ReplyToEmailMsg struct {
	Email fetcher.Email
}

type ForwardEmailMsg struct {
	Email fetcher.Email
}

type SetComposerCursorToStartMsg struct{}

type GoToFilePickerMsg struct{}

type FileSelectedMsg struct {
	Paths []string
}

type CancelFilePickerMsg struct{}

type DeleteEmailMsg struct {
	UID       uint32
	AccountID string
	Mailbox   MailboxKind
}

type ArchiveEmailMsg struct {
	UID       uint32
	AccountID string
	Mailbox   MailboxKind
}

type EmailActionDoneMsg struct {
	UID       uint32
	AccountID string
	Mailbox   MailboxKind
	Err       error
}

// Batch operation messages
type BatchDeleteEmailsMsg struct {
	UIDs      []uint32
	AccountID string
	Mailbox   MailboxKind
}

type BatchArchiveEmailsMsg struct {
	UIDs      []uint32
	AccountID string
	Mailbox   MailboxKind
}

type BatchMoveEmailsMsg struct {
	UIDs         []uint32
	AccountID    string
	SourceFolder string
	DestFolder   string
}

type BatchEmailActionDoneMsg struct {
	Count        int
	SuccessCount int
	FailureCount int
	Action       string // "delete", "archive", or "move"
	Mailbox      MailboxKind
	Err          error
}

type GoToChoiceMenuMsg struct{}

type DownloadAttachmentMsg struct {
	Index     int
	Filename  string
	PartID    string
	Data      []byte
	AccountID string
	Encoding  string
	Mailbox   MailboxKind
}

type AttachmentDownloadedMsg struct {
	Path string
	Err  error
}

type RestoreViewMsg struct{}

type BackToInboxMsg struct{}

type BackToMailboxMsg struct {
	Mailbox MailboxKind
}

// --- Draft Messages ---

// DiscardDraftMsg signals that a draft should be cached.
type DiscardDraftMsg struct {
	ComposerState *Composer
}

type EmailBodyFetchedMsg struct {
	UID          uint32
	Body         string
	BodyMIMEType string
	Attachments  []fetcher.Attachment
	Err          error
	AccountID    string
	Mailbox      MailboxKind
}

// --- Multi-Account Messages ---

// GoToAddAccountMsg signals navigation to the add account screen.
type GoToAddAccountMsg struct{}

// GoToAddMailingListMsg signals navigation to the add mailing list screen.
type GoToAddMailingListMsg struct{}

// GoToEditAccountMsg signals navigation to edit an existing account.
type GoToEditAccountMsg struct {
	AccountID    string
	Provider     string
	Name         string
	Email        string
	FetchEmail   string
	SendAsEmail  string
	CatchAll     bool
	IMAPServer   string
	IMAPPort     int
	SMTPServer   string
	SMTPPort     int
	Insecure     bool
	Protocol     string
	JMAPEndpoint string
	POP3Server   string
	POP3Port     int
	MaildirPath  string
}

// GoToEditMailingListMsg signals navigation to edit an existing mailing list.
type GoToEditMailingListMsg struct {
	Index     int
	Name      string
	Addresses string
}

// SaveMailingListMsg signals that a new or edited mailing list should be saved.
type SaveMailingListMsg struct {
	Name      string
	Addresses string
	EditIndex int // -1 means new, >= 0 means editing existing
}

// AddAccountMsg signals that a new account should be added.
type AddAccountMsg struct {
	Credentials Credentials
}

// AccountAddedMsg signals that an account was successfully added.
type AccountAddedMsg struct {
	AccountID string
	Err       error
}

// DeleteAccountMsg signals that an account should be deleted.
type DeleteAccountMsg struct {
	AccountID string
}

// AccountDeletedMsg signals that an account was successfully deleted.
type AccountDeletedMsg struct {
	AccountID string
	Err       error
}

// SwitchAccountMsg signals switching to view a specific account's inbox.
type SwitchAccountMsg struct {
	AccountID string // Empty string means "ALL" accounts
}

// AllEmailsFetchedMsg signals that emails from all accounts have been fetched.
type AllEmailsFetchedMsg struct {
	EmailsByAccount map[string][]fetcher.Email
	Mailbox         MailboxKind
}

// SwitchFromAccountMsg signals changing the "From" account in composer.
type SwitchFromAccountMsg struct {
	AccountID string
}

// GoToAccountListMsg signals navigation to the account list in settings.
type GoToAccountListMsg struct{}

// --- Draft Messages (persisted) ---

// SaveDraftMsg signals that the current draft should be saved to disk.
type SaveDraftMsg struct {
	Draft config.Draft
}

// DraftSavedMsg signals that a draft was saved successfully.
type DraftSavedMsg struct {
	DraftID string
	Err     error
}

// LoadDraftsMsg signals a request to load all saved drafts.
type LoadDraftsMsg struct{}

// DraftsLoadedMsg signals that drafts were loaded from disk.
type DraftsLoadedMsg struct {
	Drafts []config.Draft
}

// OpenDraftMsg signals that a specific draft should be opened in the composer.
type OpenDraftMsg struct {
	Draft config.Draft
}

// DeleteDraftMsg signals that a draft should be deleted.
type DeleteSavedDraftMsg struct {
	DraftID string
}

// DraftDeletedMsg signals that a draft was deleted.
type DraftDeletedMsg struct {
	DraftID string
	Err     error
}

// GoToDraftsMsg signals navigation to the drafts list.
type GoToDraftsMsg struct{}

// --- Cache Messages ---

// CachedEmailsLoadedMsg signals that cached emails were loaded from disk.
type CachedEmailsLoadedMsg struct {
	Cache *config.EmailCache
}

// RefreshingEmailsMsg signals that a background refresh is in progress.
type RefreshingEmailsMsg struct {
	Mailbox MailboxKind
}

// EmailsRefreshedMsg signals that fresh emails have been fetched in the background.
type EmailsRefreshedMsg struct {
	EmailsByAccount map[string][]fetcher.Email
	Mailbox         MailboxKind
}

// RequestRefreshMsg signals a request to refresh emails from the server.
type RequestRefreshMsg struct {
	Mailbox    MailboxKind
	Counts     map[string]int
	FolderName string
}

// --- Folder Messages ---

// FoldersFetchedMsg signals that IMAP folders have been fetched for all accounts.
//
// Errors holds per-account fetch failures (e.g. broken IMAP login, network
// unreachable). Accounts that succeeded appear in FoldersByAccount; accounts
// that failed appear in Errors. The two are disjoint by construction. This
// lets the TUI surface a non-fatal warning instead of silently dropping the
// affected account's folder list.
type FoldersFetchedMsg struct {
	FoldersByAccount map[string][]fetcher.Folder // accountID -> folders
	MergedFolders    []fetcher.Folder            // unique folders across all accounts
	Errors           map[string]error            // accountID -> fetch error, if any
}

// SwitchFolderMsg signals switching to a different IMAP folder.
type SwitchFolderMsg struct {
	FolderName     string
	PreviousFolder string
	AccountID      string
}

// FolderEmailsFetchedMsg signals that emails from a folder have been fetched.
type FolderEmailsFetchedMsg struct {
	Emails     []fetcher.Email
	AccountID  string
	FolderName string
}

// FolderEmailsAppendedMsg signals that more emails from a folder have been fetched (pagination).
type FolderEmailsAppendedMsg struct {
	Emails     []fetcher.Email
	AccountID  string
	FolderName string
}

// MoveEmailMsg signals a request to show the move-to-folder picker.
type MoveEmailMsg struct {
	UID          uint32
	AccountID    string
	SourceFolder string
}

// MoveEmailToFolderMsg signals that an email should be moved to a folder.
type MoveEmailToFolderMsg struct {
	UID          uint32
	AccountID    string
	SourceFolder string
	DestFolder   string
}

// EmailMovedMsg signals that an email was moved to a folder.
type EmailMovedMsg struct {
	UID          uint32
	AccountID    string
	SourceFolder string
	DestFolder   string
	Err          error
}

// MarkEmailAsReadMsg signals that an email should be marked as read on the server.
type MarkEmailAsReadMsg struct {
	UID        uint32
	AccountID  string
	FolderName string
}

// EmailMarkedReadMsg signals that an email was marked as read.
type EmailMarkedReadMsg struct {
	UID       uint32
	AccountID string
	Err       error
}

// EmailMarkedUnreadMsg signals that an email was marked as unread.
type EmailMarkedUnreadMsg struct {
	UID       uint32
	AccountID string
	Err       error
}

// FetchFolderMoreEmailsMsg signals a request to fetch more emails from a folder (pagination).
type FetchFolderMoreEmailsMsg struct {
	Offset     uint32
	AccountID  string
	FolderName string
	Limit      uint32
}

// --- External Editor Messages ---

// OpenEditorMsg signals that the composer body should be opened in $EDITOR.
type OpenEditorMsg struct{}

// EditorFinishedMsg signals that the external editor has closed.
type EditorFinishedMsg struct {
	Body string
	Err  error
}

// --- IDLE Messages ---

// IdleNewMailMsg signals that IMAP IDLE detected new mail for an account/folder.
type IdleNewMailMsg struct {
	AccountID  string
	FolderName string
}

// --- Daemon Messages ---

// DaemonEventMsg wraps an event pushed from the daemon process.
type DaemonEventMsg struct {
	Event *daemonrpc.Event
}

// --- Plugin Messages ---

// PluginNotifyMsg signals that a plugin wants to show a notification.
type PluginNotifyMsg struct {
	Message  string
	Duration float64 // Duration in seconds (default 2)
}

// PluginKeyBinding describes a plugin-registered keyboard shortcut for display in the help bar.
type PluginKeyBinding struct {
	Key         string
	Description string
}

// PluginPromptSubmitMsg signals that the user submitted a plugin prompt input.
type PluginPromptSubmitMsg struct {
	Value string
}

// PluginPromptCancelMsg signals that the user cancelled a plugin prompt input.
type PluginPromptCancelMsg struct{}

// GoToMarketplaceMsg signals navigation to the plugin marketplace.
type GoToMarketplaceMsg struct{}

// PasswordVerifiedMsg signals that the encryption password was verified (or failed).
type PasswordVerifiedMsg struct {
	Key []byte // The derived encryption key (nil on failure)
	Err error  // Non-nil if verification failed
}

// SecureModeEnabledMsg signals that encryption was enabled from settings.
type SecureModeEnabledMsg struct {
	Err error
}

// SecureModeDisabledMsg signals that encryption was disabled from settings.
type SecureModeDisabledMsg struct {
	Err error
}

// SendRSVPMsg signals that user wants to send RSVP to calendar invite
type SendRSVPMsg struct {
	OriginalICS []byte
	Event       *calendar.Event
	Response    string // "ACCEPTED", "DECLINED", "TENTATIVE"
	AccountID   string
	InReplyTo   string
	References  []string
}

// RSVPResultMsg signals that RSVP was sent (or failed)
type LanguageChangedMsg struct{}

// ConfigSavedMsg signals the config was written to disk and downstream
// consumers (notably the daemon) should reload it.
type ConfigSavedMsg struct{}

type RSVPResultMsg struct {
	Err       error
	Response  string // "ACCEPTED", "DECLINED", "TENTATIVE"
	Organizer string // organizer email for Google Calendar note
}