1 files changed, 164 insertions, 0 deletions
diff --git a/internal/tui/form.go b/internal/tui/form.go
new file mode 100644
index 0000000..4b12762
--- /dev/null
+++ b/internal/tui/form.go
@@ -0,0 +1,164 @@
+package tui
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"time"
+
+	"github.com/charmbracelet/bubbles/textinput"
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+)
+
+type FormField struct {
+	textinput.Model
+	label string
+}
+
+func (ff FormField) Update(msg tea.Msg) (FormField, tea.Cmd) {
+	field, cmd := ff.Model.Update(msg)
+	ff.Model = field
+	return ff, cmd
+}
+
+func newTimestampField(label string) FormField {
+	f := FormField{
+		Model: textinput.New(),
+		label: label,
+	}
+	f.Validate = func(s string) error {
+		if _, err := time.Parse(time.DateTime, s); err != nil {
+			return fmt.Errorf("timestamps must be written like \"%s\"", time.DateTime)
+		}
+		return nil
+	}
+	return f
+}
+
+func newOptionalTimestampField(label string) FormField {
+	f := FormField{
+		Model: textinput.New(),
+		label: label,
+	}
+	f.Validate = func(s string) error {
+		if s == "" {
+			return nil
+		}
+		if _, err := time.Parse(time.DateTime, s); err != nil {
+			return fmt.Errorf("timestamps must be written like \"%s\"", time.DateTime)
+		}
+		return nil
+	}
+	return f
+}
+
+func newOptionalFloatField(label string) FormField {
+	f := FormField{
+		Model: textinput.New(),
+		label: label,
+	}
+	f.Validate = func(s string) error {
+		if s == "" {
+			return nil
+		}
+		_, err := strconv.ParseFloat(s, 64)
+		if err != nil {
+			return errors.New("numerical values only")
+		}
+		return nil
+	}
+	return f
+}
+
+type Form struct {
+	fields []FormField
+	selIdx int
+
+	SelectedStyle   *lipgloss.Style
+	UnselectedStyle *lipgloss.Style
+}
+
+func NewForm(fields []FormField) Form {
+	return Form{fields: fields}
+}
+
+func (ff Form) Error() error {
+	for _, field := range ff.fields {
+		if field.Err != nil {
+			return field.Err
+		}
+	}
+	return nil
+}
+
+func NewEntryEditorForm() Form {
+	form := NewForm([]FormField{
+		newTimestampField("Start time"),
+		newOptionalTimestampField("End time"),
+		{Model: textinput.New(), label: "Client"},
+		{Model: textinput.New(), label: "Project"},
+		{Model: textinput.New(), label: "Description"},
+		newOptionalFloatField("Hourly Rate"),
+	})
+	form.SelectedStyle = &modalFocusedInputStyle
+	form.UnselectedStyle = &modalBlurredInputStyle
+	return form
+}
+
+func (ff Form) Update(msg tea.Msg) (Form, tea.Cmd) {
+	if msg, ok := msg.(tea.KeyMsg); ok {
+		switch msg.String() {
+		case "tab":
+			ff.fields[ff.selIdx].Blur()
+			ff.selIdx = (ff.selIdx + 1) % len(ff.fields)
+			return ff, ff.fields[ff.selIdx].Focus()
+		case "shift+tab":
+			ff.fields[ff.selIdx].Blur()
+			ff.selIdx--
+			if ff.selIdx < 0 {
+				ff.selIdx += len(ff.fields)
+			}
+			return ff, ff.fields[ff.selIdx].Focus()
+		}
+	}
+
+	field, cmd := ff.fields[ff.selIdx].Update(msg)
+	ff.fields[ff.selIdx] = field
+	return ff, cmd
+}
+
+func (ff Form) View() string {
+	content := ""
+	for i, field := range ff.fields {
+		if i > 0 {
+			content += "\n\n"
+		}
+		content += field.label + ":\n"
+
+		style := ff.UnselectedStyle
+		if i == ff.selIdx {
+			style = ff.SelectedStyle
+		}
+		if style != nil {
+			content += style.Render(field.View())
+		} else {
+			content += field.View()
+		}
+
+		if field.Err != nil {
+			content += "\n" + errorStyle.Render(field.Err.Error())
+		}
+	}
+	return content
+}
+
+var (
+	modalFocusedInputStyle = lipgloss.NewStyle().
+				Border(lipgloss.DoubleBorder()).
+				BorderForeground(lipgloss.Color("238"))
+	modalBlurredInputStyle = lipgloss.NewStyle().
+				Border(lipgloss.NormalBorder()).
+				BorderForeground(lipgloss.Color("238"))
+	errorStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("196"))
+)