feat: add twitch tv login flow and auth state ui

internal/app/app.go

@@ -1,24 +1,66 @@
+// app.go wires together config loading, auth bootstrap, and the Bubble Tea program.
+// It decides whether cached Twitch auth can be reused and, when needed,
+// connects the interactive login flow to the TUI through auth update messages.
 package app
 
 import (
 	"context"
+	"fmt"
+	"net/http"
 	"os"
+	"strings"
+	"time"
 
 	tea "github.com/charmbracelet/bubbletea"
 
+	"parasocial/internal/auth"
 	"parasocial/internal/config"
 	"parasocial/internal/tui"
 )
 
 // Run loads the application configuration and starts the terminal UI.
 func Run(ctx context.Context) error {
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
 	cfg, err := config.LoadDefault()
 	if err != nil {
 		return err
 	}
 
+	httpClient := &http.Client{Timeout: 30 * time.Second}
+	authClient := auth.NewClient(httpClient)
+	authPath := auth.DefaultPath()
+
+	state, err := authClient.ReuseAuth(ctx, authPath)
+	if err != nil {
+		return err
+	}
+
 	program := tea.NewProgram(
-		tui.New(cfg.Streamers),
+		tui.New(tui.Options{
+			Streamers: cfg.Streamers,
+			AuthState: state,
+			StartAuth: func(ch chan<- tui.AuthUpdate) {
+				go func() {
+					defer close(ch)
+
+					state, err := authClient.EnsureAuth(ctx, authPath, func(line string) {
+						ch <- tui.AuthUpdate{Line: strings.TrimRight(line, "\n")}
+					})
+					if err != nil {
+						ch <- tui.AuthUpdate{
+							Line: fmt.Sprintf("Authentication failed: %v", err),
+							Err:  err,
+							Done: true,
+						}
+						return
+					}
+
+					ch <- tui.AuthUpdate{State: state, Done: true}
+				}()
+			},
+		}),
 		tea.WithContext(ctx),
 		tea.WithInput(os.Stdin),
 		tea.WithOutput(os.Stdout),