package camera

import (
	"fmt"
	"sync"
)

type CameraInfo struct {
	ID     string `json:"id"`
	Name   string `json:"name"`
	Index  int    `json:"index"`
	Width  int    `json:"width"`
	Height int    `json:"height"`
}

type Manager struct {
	ffmpegCam *FFmpegCamera
	isOpen    bool
	mu        sync.Mutex
}

func NewManager() *Manager {
	return &Manager{}
}

func (m *Manager) ListCameras() []CameraInfo {
	// Try to detect real cameras via ffmpeg (auto-detects OS)
	devices := ListFFmpegDevices()
	if len(devices) > 0 {
		return devices
	}

	if !DetectFFmpeg() {
		fmt.Println("[WARN] ffmpeg not found — install with: brew install ffmpeg (macOS) or winget install ffmpeg (Windows)")
	} else {
		fmt.Println("[WARN] No video devices detected by ffmpeg")
	}
	return []CameraInfo{}
}

func (m *Manager) Open(index, width, height int) error {
	m.mu.Lock()
	defer m.mu.Unlock()

	// Try real camera via ffmpeg
	if !DetectFFmpeg() {
		return fmt.Errorf("ffmpeg not found — install with: brew install ffmpeg (macOS) or winget install ffmpeg (Windows)")
	}

	cam, err := NewFFmpegCamera(index, width, height, 30)
	if err != nil {
		return fmt.Errorf("failed to open camera (index=%d): %w", index, err)
	}
	m.ffmpegCam = cam
	m.isOpen = true
	fmt.Printf("[INFO] Opened real camera (index=%d) via ffmpeg\n", index)
	return nil
}

func (m *Manager) Close() error {
	m.mu.Lock()
	defer m.mu.Unlock()

	if m.ffmpegCam != nil {
		_ = m.ffmpegCam.Close()
		m.ffmpegCam = nil
	}
	m.isOpen = false
	return nil
}

func (m *Manager) ReadFrame() ([]byte, error) {
	m.mu.Lock()
	defer m.mu.Unlock()

	if !m.isOpen {
		return nil, fmt.Errorf("camera not open")
	}
	if m.ffmpegCam != nil {
		return m.ffmpegCam.ReadFrame()
	}
	return nil, fmt.Errorf("no camera available")
}

func (m *Manager) IsOpen() bool {
	m.mu.Lock()
	defer m.mu.Unlock()
	return m.isOpen
}