package toolsrv_test

import (
	"context"
	"net"
	"os"
	"path/filepath"
	"testing"
	"time"

	"ollie/toolsrv"
)

// TestSocketSpawnAndDial verifies the full lifecycle:
// spawn ollie-remote → dial the socket → call RPCs → close.
func TestSocketSpawnAndDial(t *testing.T) {
	// Skip if ollie-remote binary not available.
	if _, err := findBinary(); err != nil {
		t.Skipf("ollie-remote not found: %v", err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	cwd, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}

	// Spawn the toolsrv subprocess.
	proc, err := toolsrv.Spawn(ctx, cwd, toolsrv.WithYolo())
	if err != nil {
		t.Fatalf("Spawn: %v", err)
	}
	defer proc.Close()

	if proc.Socket == "" {
		t.Fatal("expected non-empty socket path")
	}

	// Verify socket file exists.
	if _, err := os.Stat(proc.Socket); err != nil {
		t.Fatalf("socket file not found: %v", err)
	}

	// Dial a connection.
	conn, err := toolsrv.Dial(ctx, toolsrv.LocalAddr(proc.Socket))
	if err != nil {
		t.Fatalf("Dial: %v", err)
	}
	defer conn.Close()

	// Ping.
	if err := conn.Ping(); err != nil {
		t.Fatalf("Ping: %v", err)
	}

	// FetchHostInfo.
	info, err := conn.FetchHostInfo()
	if err != nil {
		t.Fatalf("FetchHostInfo: %v", err)
	}
	if info.Platform == "" {
		t.Error("expected non-empty platform")
	}

	// SetEnv (fire-and-forget, just verify no crash).
	conn.SetEnv("TEST_KEY", "test_value")

	// SetCWD.
	conn.SetCWD("/tmp")

	// ListTools. The remote server starts with no promoted tools; tools are
	// loaded dynamically through the session tool registry.
	if _, err := conn.ListTools(); err != nil {
		t.Fatalf("ListTools: %v", err)
	}
}

// TestSocketMultipleClients verifies multiple clients can connect simultaneously.
func TestSocketMultipleClients(t *testing.T) {
	if _, err := findBinary(); err != nil {
		t.Skipf("ollie-remote not found: %v", err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	cwd, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}

	proc, err := toolsrv.Spawn(ctx, cwd, toolsrv.WithYolo())
	if err != nil {
		t.Fatalf("Spawn: %v", err)
	}
	defer proc.Close()

	// Dial three clients concurrently.
	conns := make([]*toolsrv.Conn, 3)
	for i := range conns {
		c, err := toolsrv.Dial(ctx, toolsrv.LocalAddr(proc.Socket))
		if err != nil {
			t.Fatalf("Dial[%d]: %v", i, err)
		}
		conns[i] = c
	}

	// Each client can ping independently.
	for i, c := range conns {
		if err := c.Ping(); err != nil {
			t.Errorf("Ping[%d]: %v", i, err)
		}
	}

	// Close all.
	for _, c := range conns {
		c.Close()
	}
}

// TestSocketCleanup verifies the socket is removed after Close.
func TestSocketCleanup(t *testing.T) {
	if _, err := findBinary(); err != nil {
		t.Skipf("ollie-remote not found: %v", err)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
	defer cancel()

	cwd, err := os.Getwd()
	if err != nil {
		t.Fatal(err)
	}

	proc, err := toolsrv.Spawn(ctx, cwd, toolsrv.WithYolo())
	if err != nil {
		t.Fatalf("Spawn: %v", err)
	}
	sockPath := proc.Socket
	proc.Close()

	// Socket should be cleaned up.
	time.Sleep(100 * time.Millisecond)
	if _, err := net.DialTimeout("unix", sockPath, time.Second); err == nil {
		t.Error("expected socket to be removed after Close")
	}
}

// findBinary checks if ollie-remote is available.
func findBinary() (string, error) {
	home, _ := os.UserHomeDir()
	candidates := []string{
		filepath.Join(home, "bin", "ollie-remote"),
		filepath.Join(home, ".local", "bin", "ollie-remote"),
	}
	for _, p := range candidates {
		if _, err := os.Stat(p); err == nil {
			return p, nil
		}
	}
	return "", os.ErrNotExist
}