From 615e0e479491987b156e75541e10fa6068ce430d Mon Sep 17 00:00:00 2001
From: PJ <ipriyanshujain@gmail.com>
Date: Thu, 23 Apr 2026 15:06:04 +0700
Subject: [PATCH] feat(ios): add simulator management package

---
 internal/ios/ios.go | 153 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 153 insertions(+)
 create mode 100644 internal/ios/ios.go

diff --git a/internal/ios/ios.go b/internal/ios/ios.go
new file mode 100644
index 0000000..36522ab
--- /dev/null
+++ b/internal/ios/ios.go
@@ -0,0 +1,153 @@
+package ios
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"strings"
+	"time"
+)
+
+type simDevice struct {
+	UDID        string `json:"udid"`
+	State       string `json:"state"`
+	Name        string `json:"name"`
+	IsAvailable bool   `json:"isAvailable"`
+}
+
+type simctlDeviceList struct {
+	Devices map[string][]simDevice `json:"devices"`
+}
+
+func EnsureSimulator(ctx context.Context, deviceName string, stdout io.Writer) error {
+	booted, err := bootedSimulator(ctx)
+	if err != nil {
+		return fmt.Errorf("list booted simulators: %w", err)
+	}
+	if booted != nil {
+		fmt.Fprintf(stdout, "using booted simulator: %s (%s)\n", booted.Name, booted.UDID)
+		return nil
+	}
+
+	available, err := availableSimulators(ctx)
+	if err != nil {
+		return fmt.Errorf("list available simulators: %w", err)
+	}
+
+	target, err := pickSimulator(deviceName, available)
+	if err != nil {
+		return err
+	}
+
+	fmt.Fprintf(stdout, "booting simulator %q (%s)...\n", target.Name, target.UDID)
+	if err := bootSimulator(ctx, target.UDID); err != nil {
+		return fmt.Errorf("boot simulator %q: %w", target.UDID, err)
+	}
+
+	if err := waitForSimulatorBoot(ctx, target.UDID, 60*time.Second); err != nil {
+		return fmt.Errorf("wait for simulator boot: %w", err)
+	}
+
+	fmt.Fprintf(stdout, "simulator %q ready\n", target.Name)
+	return nil
+}
+
+func LaunchApp(ctx context.Context, bundleID string, env map[string]string) error {
+	args := []string{"simctl", "launch", "--terminate-running-process", "booted", bundleID}
+	cmd := exec.CommandContext(ctx, "xcrun", args...)
+	cmd.Env = os.Environ()
+	for k, v := range env {
+		cmd.Env = append(cmd.Env, "SIMCTL_CHILD_"+k+"="+v)
+	}
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		return fmt.Errorf("launch %s: %w\n%s", bundleID, err, strings.TrimSpace(string(out)))
+	}
+	return nil
+}
+
+func bootedSimulator(ctx context.Context) (*simDevice, error) {
+	out, err := exec.CommandContext(ctx, "xcrun", "simctl", "list", "devices", "booted", "--json").Output()
+	if err != nil {
+		return nil, err
+	}
+	var list simctlDeviceList
+	if err := json.Unmarshal(out, &list); err != nil {
+		return nil, err
+	}
+	for _, devices := range list.Devices {
+		for _, d := range devices {
+			if d.State == "Booted" {
+				return &d, nil
+			}
+		}
+	}
+	return nil, nil
+}
+
+func availableSimulators(ctx context.Context) ([]simDevice, error) {
+	out, err := exec.CommandContext(ctx, "xcrun", "simctl", "list", "devices", "available", "--json").Output()
+	if err != nil {
+		return nil, err
+	}
+	var list simctlDeviceList
+	if err := json.Unmarshal(out, &list); err != nil {
+		return nil, err
+	}
+	var result []simDevice
+	for _, devices := range list.Devices {
+		for _, d := range devices {
+			if d.IsAvailable {
+				result = append(result, d)
+			}
+		}
+	}
+	return result, nil
+}
+
+func pickSimulator(deviceName string, available []simDevice) (*simDevice, error) {
+	if deviceName != "" {
+		for i, d := range available {
+			if d.Name == deviceName || d.UDID == deviceName {
+				return &available[i], nil
+			}
+		}
+		return nil, fmt.Errorf("simulator %q not found among available simulators; run `xcrun simctl list devices available` to see options", deviceName)
+	}
+
+	if len(available) == 0 {
+		return nil, fmt.Errorf("no available iOS simulators found; create one in Xcode -> Window -> Devices and Simulators")
+	}
+
+	for i, d := range available {
+		if strings.HasPrefix(d.Name, "iPhone") {
+			return &available[i], nil
+		}
+	}
+	return &available[0], nil
+}
+
+func bootSimulator(ctx context.Context, udid string) error {
+	return exec.CommandContext(ctx, "xcrun", "simctl", "boot", udid).Run()
+}
+
+func waitForSimulatorBoot(ctx context.Context, udid string, timeout time.Duration) error {
+	deadline, cancel := context.WithTimeout(ctx, timeout)
+	defer cancel()
+	ticker := time.NewTicker(2 * time.Second)
+	defer ticker.Stop()
+	for {
+		booted, _ := bootedSimulator(deadline)
+		if booted != nil && (booted.UDID == udid || udid == "") {
+			return nil
+		}
+		select {
+		case <-deadline.Done():
+			return deadline.Err()
+		case <-ticker.C:
+		}
+	}
+}