Fearure:

- 增加收件箱功能（有BUG）
- 增加已发送|草稿箱|发送历史 本地记录

imap.go

@@ -0,0 +1,181 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	imap "github.com/BrianLeishman/go-imap"
+)
+
+type ReceivedEmail struct {
+	UID       uint32
+	From      string
+	FromName  string
+	Subject   string
+	Date      time.Time
+	Preview   string
+	Account   string
+	AccountID string
+}
+
+func getEmailProviderName(email string) string {
+	if len(email) == 0 {
+		return "Email"
+	}
+	atIdx := -1
+	for i := len(email) - 1; i >= 0; i-- {
+		if email[i] == '@' {
+			atIdx = i
+			break
+		}
+	}
+	if atIdx == -1 {
+		return "Email"
+	}
+	domain := email[atIdx+1:]
+	for i := len(domain) - 1; i >= 0; i-- {
+		if domain[i] == '.' {
+			return domain[:i]
+		}
+	}
+	return domain
+}
+
+func FetchUnreadEmails(account Account, days int) ([]ReceivedEmail, error) {
+	if account.IMAP.Host == "" {
+		return nil, fmt.Errorf("IMAP host not configured for account: %s", account.Email)
+	}
+
+	port := account.IMAP.Port
+	if port == 0 {
+		port = 993
+	}
+
+	username := account.IMAP.Username
+	if username == "" {
+		username = account.Email
+	}
+
+	m, err := imap.New(username, account.IMAP.Password, account.IMAP.Host, port)
+	if err != nil {
+		return nil, fmt.Errorf("failed to connect to IMAP server: %w", err)
+	}
+	defer m.Close()
+
+	err = m.SelectFolder("INBOX")
+	if err != nil {
+		return nil, fmt.Errorf("failed to select inbox: %w", err)
+	}
+
+	sinceDate := time.Now().AddDate(0, 0, -days)
+
+	uids, err := m.GetUIDs(imap.Search().Since(sinceDate).Unseen().Build())
+	if err != nil {
+		return nil, fmt.Errorf("failed to search emails: %w", err)
+	}
+
+	if len(uids) == 0 {
+		return nil, nil
+	}
+
+	overviews, err := m.GetOverviews(uids...)
+	if err != nil {
+		return nil, fmt.Errorf("failed to fetch emails: %w", err)
+	}
+
+	var emails []ReceivedEmail
+	accountName := getEmailProviderName(account.Email)
+	accountID := account.Email
+	if account.Name != "" {
+		accountName = account.Name
+		accountID = account.Name
+	}
+
+	for uid, email := range overviews {
+		from := ""
+		if len(email.From) > 0 {
+			for _, addr := range email.From {
+				from = addr
+				break
+			}
+		}
+
+		emails = append(emails, ReceivedEmail{
+			UID:       uint32(uid),
+			From:      from,
+			FromName:  "",
+			Subject:   email.Subject,
+			Date:      email.Sent,
+			Preview:   fmt.Sprintf("(%.1f KB)", float64(email.Size)/1024),
+			Account:   accountName,
+			AccountID: accountID,
+		})
+	}
+
+	return emails, nil
+}
+
+func GetAccountByEmail(email string) (Account, error) {
+	accounts, err := getAccounts()
+	if err != nil {
+		return Account{}, err
+	}
+
+	for _, acc := range accounts {
+		if acc.Email == email || acc.Name == email {
+			return acc, nil
+		}
+	}
+
+	return Account{}, fmt.Errorf("account not found: %s", email)
+}
+
+func GetAccountByID(id string) (Account, error) {
+	accounts, err := getAccounts()
+	if err != nil {
+		return Account{}, err
+	}
+
+	for _, acc := range accounts {
+		if acc.Email == id || acc.Name == id {
+			return acc, nil
+		}
+	}
+
+	return Account{}, fmt.Errorf("account not found: %s", id)
+}
+
+func FetchAllUnreadEmails(days int) ([]ReceivedEmail, error) {
+	accounts, err := getAccounts()
+	if err != nil {
+		return nil, err
+	}
+
+	if len(accounts) == 0 {
+		return nil, fmt.Errorf("no accounts configured")
+	}
+
+	var allEmails []ReceivedEmail
+
+	for _, account := range accounts {
+		emails, err := FetchUnreadEmails(account, days)
+		if err != nil {
+			continue
+		}
+		allEmails = append(allEmails, emails...)
+	}
+
+	sortEmailsByDate(allEmails)
+
+	return allEmails, nil
+}
+
+func sortEmailsByDate(emails []ReceivedEmail) {
+	for i := 0; i < len(emails)-1; i++ {
+		for j := i + 1; j < len(emails); j++ {
+			if emails[j].Date.After(emails[i].Date) {
+				emails[i], emails[j] = emails[j], emails[i]
+			}
+		}
+	}
+}