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|
package main
import (
"database/sql"
"fmt"
"strings"
"time"
)
// Invoice represents an invoice with metadata
type Invoice struct {
ID int64
ClientID int64
InvoiceNumber string
CreatedAt int64
SentAt sql.NullInt64
PaidAt sql.NullInt64
TotalHours float64
HourlyRate sql.NullFloat64
TotalAmount sql.NullFloat64
Currency string
Notes string
Status string
}
// InvoiceLineItem represents a single line item on an invoice (immutable snapshot)
type InvoiceLineItem struct {
ID int64
InvoiceID int64
Date string
StartTime int64
EndTime sql.NullInt64
Hours float64
Description string
SourceEntryID sql.NullInt64
}
// InvoiceWithItems combines an invoice with its line items
type InvoiceWithItems struct {
Invoice
LineItems []InvoiceLineItem
}
// GenerateInvoiceNumber generates a unique invoice number in SHORTCODE-YYYY-NNN format
// where SHORTCODE is the client's invoice prefix, YYYY is the current year, and NNN is
// a sequential number starting from 001 for that client+year combination.
func GenerateInvoiceNumber(db *sql.DB, shortcode string) (string, error) {
if shortcode == "" {
return "", fmt.Errorf("client shortcode is required for invoice number generation")
}
currentYear := time.Now().Year()
prefix := fmt.Sprintf("%s-%d", shortcode, currentYear)
// Find the highest invoice number for this client+year combination
var maxNumber sql.NullInt64
query := `
SELECT MAX(CAST(SUBSTR(invoice_number, LENGTH(?) + 2) AS INTEGER))
FROM invoices
WHERE invoice_number LIKE ? || '-%'
`
err := db.QueryRow(query, prefix, prefix).Scan(&maxNumber)
if err != nil && err != sql.ErrNoRows {
return "", fmt.Errorf("failed to query max invoice number: %w", err)
}
nextNumber := 1
if maxNumber.Valid {
nextNumber = int(maxNumber.Int64) + 1
}
return fmt.Sprintf("%s-%03d", prefix, nextNumber), nil
}
// GetUninvoicedEntries returns all time entries for a client that haven't been invoiced yet
func GetUninvoicedEntries(db *sql.DB, clientID int64) ([]TimeEntry, error) {
rows, err := db.Query(`
SELECT id, client_id, start_time, end_time, comment
FROM time_entries
WHERE client_id = ? AND invoice_id IS NULL AND end_time IS NOT NULL
ORDER BY start_time
`, clientID)
if err != nil {
return nil, fmt.Errorf("failed to query uninvoiced entries: %w", err)
}
defer rows.Close()
var entries []TimeEntry
for rows.Next() {
var entry TimeEntry
if err := rows.Scan(&entry.ID, &entry.ClientID, &entry.StartTime, &entry.EndTime, &entry.Comment); err != nil {
return nil, fmt.Errorf("failed to scan entry: %w", err)
}
entries = append(entries, entry)
}
if err := rows.Err(); err != nil {
return nil, fmt.Errorf("error iterating entries: %w", err)
}
return entries, nil
}
// CreateInvoice creates a new invoice with the specified time entries.
// This function creates the invoice, snapshots the time entries as line items,
// and marks the source entries as invoiced - all atomically.
func CreateInvoice(db *sql.DB, clientID int64, entryIDs []int64, hourlyRate *float64, notes string) (*Invoice, error) {
if len(entryIDs) == 0 {
return nil, fmt.Errorf("cannot create invoice with no entries")
}
// Begin transaction
tx, err := db.Begin()
if err != nil {
return nil, fmt.Errorf("failed to begin transaction: %w", err)
}
defer func() {
if err != nil {
tx.Rollback()
}
}()
// Get client shortcode for invoice number generation
var shortcode string
err = db.QueryRow("SELECT shortcode FROM clients WHERE id = ?", clientID).Scan(&shortcode)
if err != nil {
return nil, fmt.Errorf("failed to get client shortcode: %w", err)
}
if shortcode == "" {
return nil, fmt.Errorf("client must have a shortcode before creating invoices")
}
// Generate invoice number with client shortcode
invoiceNumber, err := GenerateInvoiceNumber(db, shortcode)
if err != nil {
return nil, fmt.Errorf("failed to generate invoice number: %w", err)
}
// Fetch the time entries to be invoiced
var placeholders strings.Builder
args := []any{clientID}
for i, entryID := range entryIDs {
if i > 0 {
placeholders.WriteString(",")
}
placeholders.WriteString("?")
args = append(args, entryID)
}
query := fmt.Sprintf(`
SELECT id, client_id, start_time, end_time, comment
FROM time_entries
WHERE client_id = ? AND id IN (%s) AND invoice_id IS NULL AND end_time IS NOT NULL
`, placeholders.String())
rows, err := tx.Query(query, args...)
if err != nil {
return nil, fmt.Errorf("failed to query entries: %w", err)
}
var entries []TimeEntry
for rows.Next() {
var entry TimeEntry
if err := rows.Scan(&entry.ID, &entry.ClientID, &entry.StartTime, &entry.EndTime, &entry.Comment); err != nil {
rows.Close()
return nil, fmt.Errorf("failed to scan entry: %w", err)
}
entries = append(entries, entry)
}
rows.Close()
if len(entries) == 0 {
return nil, fmt.Errorf("no valid uninvoiced entries found")
}
if len(entries) != len(entryIDs) {
return nil, fmt.Errorf("some entries are already invoiced or don't exist")
}
// Calculate total hours
var totalHours float64
for _, entry := range entries {
if entry.EndTime.Valid {
durationSeconds := entry.EndTime.Int64 - entry.StartTime
totalHours += float64(durationSeconds) / 3600.0
}
}
// Calculate total amount if hourly rate provided
var totalAmount sql.NullFloat64
if hourlyRate != nil {
totalAmount = sql.NullFloat64{Float64: totalHours * (*hourlyRate), Valid: true}
}
// Create invoice record
result, err := tx.Exec(`
INSERT INTO invoices (client_id, invoice_number, created_at, total_hours, hourly_rate, total_amount, notes, status)
VALUES (?, ?, ?, ?, ?, ?, ?, 'draft')
`, clientID, invoiceNumber, time.Now().Unix(), totalHours, hourlyRate, totalAmount, notes)
if err != nil {
return nil, fmt.Errorf("failed to create invoice: %w", err)
}
invoiceID, err := result.LastInsertId()
if err != nil {
return nil, fmt.Errorf("failed to get invoice ID: %w", err)
}
// Create invoice line items (immutable snapshots)
for _, entry := range entries {
hours := float64(0)
if entry.EndTime.Valid {
hours = float64(entry.EndTime.Int64-entry.StartTime) / 3600.0
}
_, err = tx.Exec(`
INSERT INTO invoice_line_items (invoice_id, date, start_time, end_time, hours, description, source_entry_id)
VALUES (?, ?, ?, ?, ?, ?, ?)
`,
invoiceID,
timestampToDate(entry.StartTime),
entry.StartTime,
entry.EndTime,
hours,
entry.Comment,
entry.ID,
)
if err != nil {
return nil, fmt.Errorf("failed to create line item: %w", err)
}
// Mark source entry as invoiced
_, err = tx.Exec(`
UPDATE time_entries
SET invoice_id = ?
WHERE id = ?
`, invoiceID, entry.ID)
if err != nil {
return nil, fmt.Errorf("failed to mark entry as invoiced: %w", err)
}
}
// Commit transaction
if err := tx.Commit(); err != nil {
return nil, fmt.Errorf("failed to commit invoice transaction: %w", err)
}
// Return the created invoice
invoice := &Invoice{
ID: invoiceID,
ClientID: clientID,
InvoiceNumber: invoiceNumber,
CreatedAt: time.Now().Unix(),
TotalHours: totalHours,
Status: "draft",
Notes: notes,
}
if hourlyRate != nil {
invoice.HourlyRate = sql.NullFloat64{Float64: *hourlyRate, Valid: true}
invoice.TotalAmount = totalAmount
}
return invoice, nil
}
// GetInvoiceWithItems loads a complete invoice with all its line items
func GetInvoiceWithItems(db *sql.DB, invoiceID int64) (*InvoiceWithItems, error) {
// Load invoice
var invoice Invoice
err := db.QueryRow(`
SELECT id, client_id, invoice_number, created_at, sent_at, paid_at,
total_hours, hourly_rate, total_amount, currency, notes, status
FROM invoices
WHERE id = ?
`, invoiceID).Scan(
&invoice.ID, &invoice.ClientID, &invoice.InvoiceNumber, &invoice.CreatedAt,
&invoice.SentAt, &invoice.PaidAt, &invoice.TotalHours, &invoice.HourlyRate,
&invoice.TotalAmount, &invoice.Currency, &invoice.Notes, &invoice.Status,
)
if err == sql.ErrNoRows {
return nil, fmt.Errorf("invoice not found")
}
if err != nil {
return nil, fmt.Errorf("failed to load invoice: %w", err)
}
// Load line items
rows, err := db.Query(`
SELECT id, invoice_id, date, start_time, end_time, hours, description, source_entry_id
FROM invoice_line_items
WHERE invoice_id = ?
ORDER BY start_time
`, invoiceID)
if err != nil {
return nil, fmt.Errorf("failed to query line items: %w", err)
}
defer rows.Close()
var lineItems []InvoiceLineItem
for rows.Next() {
var item InvoiceLineItem
if err := rows.Scan(&item.ID, &item.InvoiceID, &item.Date, &item.StartTime, &item.EndTime, &item.Hours, &item.Description, &item.SourceEntryID); err != nil {
return nil, fmt.Errorf("failed to scan line item: %w", err)
}
lineItems = append(lineItems, item)
}
if err := rows.Err(); err != nil {
return nil, fmt.Errorf("error iterating line items: %w", err)
}
return &InvoiceWithItems{
Invoice: invoice,
LineItems: lineItems,
}, nil
}
// ListInvoices returns all invoices for a client, ordered by creation date descending
func ListInvoices(db *sql.DB, clientID int64) ([]Invoice, error) {
rows, err := db.Query(`
SELECT id, client_id, invoice_number, created_at, sent_at, paid_at,
total_hours, hourly_rate, total_amount, currency, notes, status
FROM invoices
WHERE client_id = ?
ORDER BY created_at DESC
`, clientID)
if err != nil {
return nil, fmt.Errorf("failed to query invoices: %w", err)
}
defer rows.Close()
var invoices []Invoice
for rows.Next() {
var invoice Invoice
if err := rows.Scan(
&invoice.ID, &invoice.ClientID, &invoice.InvoiceNumber, &invoice.CreatedAt,
&invoice.SentAt, &invoice.PaidAt, &invoice.TotalHours, &invoice.HourlyRate,
&invoice.TotalAmount, &invoice.Currency, &invoice.Notes, &invoice.Status,
); err != nil {
return nil, fmt.Errorf("failed to scan invoice: %w", err)
}
invoices = append(invoices, invoice)
}
if err := rows.Err(); err != nil {
return nil, fmt.Errorf("error iterating invoices: %w", err)
}
return invoices, nil
}
// MarkInvoiceSent updates an invoice's sent_at timestamp and sets status to 'sent'
func MarkInvoiceSent(db *sql.DB, invoiceID int64) error {
result, err := db.Exec(`
UPDATE invoices
SET sent_at = ?, status = 'sent'
WHERE id = ? AND sent_at IS NULL
`, time.Now().Unix(), invoiceID)
if err != nil {
return fmt.Errorf("failed to mark invoice as sent: %w", err)
}
rows, err := result.RowsAffected()
if err != nil {
return fmt.Errorf("failed to get rows affected: %w", err)
}
if rows == 0 {
return fmt.Errorf("invoice not found or already sent")
}
return nil
}
// MarkInvoicePaid updates an invoice's paid_at timestamp and sets status to 'paid'
func MarkInvoicePaid(db *sql.DB, invoiceID int64) error {
result, err := db.Exec(`
UPDATE invoices
SET paid_at = ?, status = 'paid'
WHERE id = ? AND paid_at IS NULL
`, time.Now().Unix(), invoiceID)
if err != nil {
return fmt.Errorf("failed to mark invoice as paid: %w", err)
}
rows, err := result.RowsAffected()
if err != nil {
return fmt.Errorf("failed to get rows affected: %w", err)
}
if rows == 0 {
return fmt.Errorf("invoice not found or already paid")
}
return nil
}
// createInvoiceCLI handles the 'create-invoice' command-line operation.
// It loads the specified client, gets all uninvoiced entries, creates an invoice,
// and prints a summary.
func createInvoiceCLI(db *sql.DB, clientName string) error {
// Get client
client, err := GetClientByName(db, clientName)
if err != nil {
return fmt.Errorf("failed to get client: %w", err)
}
if client == nil {
return fmt.Errorf("client '%s' not found", clientName)
}
// Get uninvoiced entries
entries, err := GetUninvoicedEntries(db, client.ID)
if err != nil {
return fmt.Errorf("failed to get uninvoiced entries: %w", err)
}
if len(entries) == 0 {
fmt.Printf("No uninvoiced entries for client '%s'\n", clientName)
return nil
}
// Collect entry IDs
var entryIDs []int64
for _, entry := range entries {
entryIDs = append(entryIDs, entry.ID)
}
fmt.Printf("Creating invoice for client '%s' with %d entries\n", clientName, len(entries))
// Create invoice
invoice, err := CreateInvoice(db, client.ID, entryIDs, nil, "")
if err != nil {
return fmt.Errorf("failed to create invoice: %w", err)
}
fmt.Printf("\n✓ Invoice created successfully\n")
fmt.Printf(" Invoice Number: %s\n", invoice.InvoiceNumber)
fmt.Printf(" Total Hours: %.2f\n", invoice.TotalHours)
fmt.Printf(" Status: %s\n", invoice.Status)
return nil
}
|