"""Picture target routes: CRUD, processing control, settings, state, metrics."""

import base64
import io
import secrets
import time

import numpy as np
from fastapi import APIRouter, HTTPException, Depends, Query, WebSocket, WebSocketDisconnect
from PIL import Image

from wled_controller.api.auth import AuthRequired
from wled_controller.api.dependencies import (
    get_device_store,
    get_pattern_template_store,
    get_picture_source_store,
    get_picture_target_store,
    get_pp_template_store,
    get_processor_manager,
    get_template_store,
)
from wled_controller.api.schemas.picture_targets import (
    ExtractedColorResponse,
    KCTestRectangleResponse,
    KCTestResponse,
    KeyColorsResponse,
    KeyColorsSettingsSchema,
    PictureTargetCreate,
    PictureTargetListResponse,
    PictureTargetResponse,
    PictureTargetUpdate,
    TargetMetricsResponse,
    TargetProcessingState,
)
from wled_controller.config import get_config
from wled_controller.core.capture_engines import EngineRegistry
from wled_controller.core.filters import FilterRegistry, ImagePool
from wled_controller.core.processing.processor_manager import ProcessorManager
from wled_controller.core.capture.screen_capture import (
    calculate_average_color,
    calculate_dominant_color,
    calculate_median_color,
)
from wled_controller.storage import DeviceStore
from wled_controller.storage.pattern_template_store import PatternTemplateStore
from wled_controller.storage.picture_source import ScreenCapturePictureSource, StaticImagePictureSource
from wled_controller.storage.picture_source_store import PictureSourceStore
from wled_controller.storage.template_store import TemplateStore
from wled_controller.storage.wled_picture_target import WledPictureTarget
from wled_controller.storage.key_colors_picture_target import (
    KeyColorsSettings,
    KeyColorsPictureTarget,
)
from wled_controller.storage.picture_target_store import PictureTargetStore
from wled_controller.utils import get_logger

logger = get_logger(__name__)

router = APIRouter()


def _kc_settings_to_schema(settings: KeyColorsSettings) -> KeyColorsSettingsSchema:
    """Convert core KeyColorsSettings to schema."""
    return KeyColorsSettingsSchema(
        fps=settings.fps,
        interpolation_mode=settings.interpolation_mode,
        smoothing=settings.smoothing,
        pattern_template_id=settings.pattern_template_id,
        brightness=settings.brightness,
    )


def _kc_schema_to_settings(schema: KeyColorsSettingsSchema) -> KeyColorsSettings:
    """Convert schema KeyColorsSettings to core."""
    return KeyColorsSettings(
        fps=schema.fps,
        interpolation_mode=schema.interpolation_mode,
        smoothing=schema.smoothing,
        pattern_template_id=schema.pattern_template_id,
        brightness=schema.brightness,
    )


def _target_to_response(target) -> PictureTargetResponse:
    """Convert a PictureTarget to PictureTargetResponse."""
    if isinstance(target, WledPictureTarget):
        return PictureTargetResponse(
            id=target.id,
            name=target.name,
            target_type=target.target_type,
            device_id=target.device_id,
            color_strip_source_id=target.color_strip_source_id,
            standby_interval=target.standby_interval,
            state_check_interval=target.state_check_interval,
            description=target.description,
            created_at=target.created_at,
            updated_at=target.updated_at,
        )
    elif isinstance(target, KeyColorsPictureTarget):
        return PictureTargetResponse(
            id=target.id,
            name=target.name,
            target_type=target.target_type,
            picture_source_id=target.picture_source_id,
            key_colors_settings=_kc_settings_to_schema(target.settings),
            description=target.description,
            created_at=target.created_at,
            updated_at=target.updated_at,
        )
    else:
        return PictureTargetResponse(
            id=target.id,
            name=target.name,
            target_type=target.target_type,
            description=target.description,
            created_at=target.created_at,
            updated_at=target.updated_at,
        )


# ===== CRUD ENDPOINTS =====

@router.post("/api/v1/picture-targets", response_model=PictureTargetResponse, tags=["Targets"], status_code=201)
async def create_target(
    data: PictureTargetCreate,
    _auth: AuthRequired,
    target_store: PictureTargetStore = Depends(get_picture_target_store),
    device_store: DeviceStore = Depends(get_device_store),
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Create a new picture target."""
    try:
        # Validate device exists if provided
        if data.device_id:
            device = device_store.get_device(data.device_id)
            if not device:
                raise HTTPException(status_code=422, detail=f"Device {data.device_id} not found")

        kc_settings = _kc_schema_to_settings(data.key_colors_settings) if data.key_colors_settings else None

        # Create in store
        target = target_store.create_target(
            name=data.name,
            target_type=data.target_type,
            device_id=data.device_id,
            color_strip_source_id=data.color_strip_source_id,
            standby_interval=data.standby_interval,
            state_check_interval=data.state_check_interval,
            picture_source_id=data.picture_source_id,
            key_colors_settings=kc_settings,
            description=data.description,
        )

        # Register in processor manager
        try:
            target.register_with_manager(manager)
        except ValueError as e:
            logger.warning(f"Could not register target {target.id} in processor manager: {e}")

        return _target_to_response(target)

    except HTTPException:
        raise
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to create target: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/api/v1/picture-targets", response_model=PictureTargetListResponse, tags=["Targets"])
async def list_targets(
    _auth: AuthRequired,
    target_store: PictureTargetStore = Depends(get_picture_target_store),
):
    """List all picture targets."""
    targets = target_store.get_all_targets()
    responses = [_target_to_response(t) for t in targets]
    return PictureTargetListResponse(targets=responses, count=len(responses))


@router.get("/api/v1/picture-targets/{target_id}", response_model=PictureTargetResponse, tags=["Targets"])
async def get_target(
    target_id: str,
    _auth: AuthRequired,
    target_store: PictureTargetStore = Depends(get_picture_target_store),
):
    """Get a picture target by ID."""
    try:
        target = target_store.get_target(target_id)
        return _target_to_response(target)
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.put("/api/v1/picture-targets/{target_id}", response_model=PictureTargetResponse, tags=["Targets"])
async def update_target(
    target_id: str,
    data: PictureTargetUpdate,
    _auth: AuthRequired,
    target_store: PictureTargetStore = Depends(get_picture_target_store),
    device_store: DeviceStore = Depends(get_device_store),
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Update a picture target."""
    try:
        # Validate device exists if changing
        if data.device_id is not None and data.device_id:
            device = device_store.get_device(data.device_id)
            if not device:
                raise HTTPException(status_code=422, detail=f"Device {data.device_id} not found")

        kc_settings = _kc_schema_to_settings(data.key_colors_settings) if data.key_colors_settings else None

        # Update in store
        target = target_store.update_target(
            target_id=target_id,
            name=data.name,
            device_id=data.device_id,
            color_strip_source_id=data.color_strip_source_id,
            standby_interval=data.standby_interval,
            state_check_interval=data.state_check_interval,
            picture_source_id=data.picture_source_id,
            key_colors_settings=kc_settings,
            description=data.description,
        )

        # Sync processor manager
        try:
            target.sync_with_manager(
                manager,
                settings_changed=(data.standby_interval is not None or
                                  data.state_check_interval is not None or
                                  data.key_colors_settings is not None),
                source_changed=data.color_strip_source_id is not None,
                device_changed=data.device_id is not None,
            )
        except ValueError:
            pass

        return _target_to_response(target)

    except HTTPException:
        raise
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to update target: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.delete("/api/v1/picture-targets/{target_id}", status_code=204, tags=["Targets"])
async def delete_target(
    target_id: str,
    _auth: AuthRequired,
    target_store: PictureTargetStore = Depends(get_picture_target_store),
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Delete a picture target. Stops processing first if active."""
    try:
        # Stop processing if running
        try:
            await manager.stop_processing(target_id)
        except ValueError:
            pass

        # Remove from manager
        try:
            manager.remove_target(target_id)
        except (ValueError, RuntimeError):
            pass

        # Delete from store
        target_store.delete_target(target_id)

        logger.info(f"Deleted target {target_id}")

    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to delete target: {e}")
        raise HTTPException(status_code=500, detail=str(e))


# ===== PROCESSING CONTROL ENDPOINTS =====

@router.post("/api/v1/picture-targets/{target_id}/start", tags=["Processing"])
async def start_processing(
    target_id: str,
    _auth: AuthRequired,
    target_store: PictureTargetStore = Depends(get_picture_target_store),
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Start processing for a picture target."""
    try:
        # Verify target exists in store
        target_store.get_target(target_id)

        await manager.start_processing(target_id)

        logger.info(f"Started processing for target {target_id}")
        return {"status": "started", "target_id": target_id}

    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except RuntimeError as e:
        raise HTTPException(status_code=409, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to start processing: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/api/v1/picture-targets/{target_id}/stop", tags=["Processing"])
async def stop_processing(
    target_id: str,
    _auth: AuthRequired,
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Stop processing for a picture target."""
    try:
        await manager.stop_processing(target_id)

        logger.info(f"Stopped processing for target {target_id}")
        return {"status": "stopped", "target_id": target_id}

    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to stop processing: {e}")
        raise HTTPException(status_code=500, detail=str(e))


# ===== STATE & METRICS ENDPOINTS =====

@router.get("/api/v1/picture-targets/{target_id}/state", response_model=TargetProcessingState, tags=["Processing"])
async def get_target_state(
    target_id: str,
    _auth: AuthRequired,
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Get current processing state for a target."""
    try:
        state = manager.get_target_state(target_id)
        return TargetProcessingState(**state)

    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to get target state: {e}")
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/api/v1/picture-targets/{target_id}/metrics", response_model=TargetMetricsResponse, tags=["Metrics"])
async def get_target_metrics(
    target_id: str,
    _auth: AuthRequired,
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Get processing metrics for a target."""
    try:
        metrics = manager.get_target_metrics(target_id)
        return TargetMetricsResponse(**metrics)

    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to get target metrics: {e}")
        raise HTTPException(status_code=500, detail=str(e))


# ===== KEY COLORS ENDPOINTS =====

@router.get("/api/v1/picture-targets/{target_id}/colors", response_model=KeyColorsResponse, tags=["Key Colors"])
async def get_target_colors(
    target_id: str,
    _auth: AuthRequired,
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Get latest extracted colors for a key-colors target (polling)."""
    try:
        raw_colors = manager.get_kc_latest_colors(target_id)
        colors = {}
        for name, (r, g, b) in raw_colors.items():
            colors[name] = ExtractedColorResponse(
                r=r, g=g, b=b,
                hex=f"#{r:02x}{g:02x}{b:02x}",
            )
        from datetime import datetime
        return KeyColorsResponse(
            target_id=target_id,
            colors=colors,
            timestamp=datetime.utcnow(),
        )
    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))


@router.post("/api/v1/picture-targets/{target_id}/test", response_model=KCTestResponse, tags=["Key Colors"])
async def test_kc_target(
    target_id: str,
    _auth: AuthRequired,
    target_store: PictureTargetStore = Depends(get_picture_target_store),
    source_store: PictureSourceStore = Depends(get_picture_source_store),
    template_store: TemplateStore = Depends(get_template_store),
    pattern_store: PatternTemplateStore = Depends(get_pattern_template_store),
    processor_manager: ProcessorManager = Depends(get_processor_manager),
    device_store: DeviceStore = Depends(get_device_store),
    pp_template_store=Depends(get_pp_template_store),
):
    """Test a key-colors target: capture a frame, extract colors from each rectangle."""
    import httpx

    stream = None
    try:
        # 1. Load and validate KC target
        try:
            target = target_store.get_target(target_id)
        except ValueError as e:
            raise HTTPException(status_code=404, detail=str(e))

        if not isinstance(target, KeyColorsPictureTarget):
            raise HTTPException(status_code=400, detail="Target is not a key_colors target")

        settings = target.settings

        # 2. Resolve pattern template
        if not settings.pattern_template_id:
            raise HTTPException(status_code=400, detail="No pattern template configured")

        try:
            pattern_tmpl = pattern_store.get_template(settings.pattern_template_id)
        except ValueError:
            raise HTTPException(status_code=400, detail=f"Pattern template not found: {settings.pattern_template_id}")

        rectangles = pattern_tmpl.rectangles
        if not rectangles:
            raise HTTPException(status_code=400, detail="Pattern template has no rectangles")

        # 3. Resolve picture source and capture a frame
        if not target.picture_source_id:
            raise HTTPException(status_code=400, detail="No picture source configured")

        try:
            chain = source_store.resolve_stream_chain(target.picture_source_id)
        except ValueError as e:
            raise HTTPException(status_code=400, detail=str(e))

        raw_stream = chain["raw_stream"]

        if isinstance(raw_stream, StaticImagePictureSource):
            source = raw_stream.image_source
            if source.startswith(("http://", "https://")):
                async with httpx.AsyncClient(timeout=15, follow_redirects=True) as client:
                    resp = await client.get(source)
                    resp.raise_for_status()
                    pil_image = Image.open(io.BytesIO(resp.content)).convert("RGB")
            else:
                from pathlib import Path
                path = Path(source)
                if not path.exists():
                    raise HTTPException(status_code=400, detail=f"Image file not found: {source}")
                pil_image = Image.open(path).convert("RGB")

        elif isinstance(raw_stream, ScreenCapturePictureSource):
            try:
                capture_template = template_store.get_template(raw_stream.capture_template_id)
            except ValueError:
                raise HTTPException(
                    status_code=400,
                    detail=f"Capture template not found: {raw_stream.capture_template_id}",
                )

            display_index = raw_stream.display_index

            if capture_template.engine_type not in EngineRegistry.get_available_engines():
                raise HTTPException(
                    status_code=400,
                    detail=f"Engine '{capture_template.engine_type}' is not available on this system",
                )

            locked_device_id = processor_manager.get_display_lock_info(display_index)
            if locked_device_id:
                try:
                    device = device_store.get_device(locked_device_id)
                    device_name = device.name
                except Exception:
                    device_name = locked_device_id
                raise HTTPException(
                    status_code=409,
                    detail=f"Display {display_index} is currently being captured by device '{device_name}'. "
                           f"Please stop the device processing before testing.",
                )

            stream = EngineRegistry.create_stream(
                capture_template.engine_type, display_index, capture_template.engine_config
            )
            stream.initialize()

            screen_capture = stream.capture_frame()
            if screen_capture is None:
                raise RuntimeError("No frame captured")

            if isinstance(screen_capture.image, np.ndarray):
                pil_image = Image.fromarray(screen_capture.image)
            else:
                raise ValueError("Unexpected image format from engine")
        else:
            raise HTTPException(status_code=400, detail="Unsupported picture source type")

        # 3b. Apply postprocessing filters (if the picture source has a filter chain)
        pp_template_ids = chain.get("postprocessing_template_ids", [])
        if pp_template_ids and pp_template_store:
            img_array = np.array(pil_image)
            image_pool = ImagePool()
            for pp_id in pp_template_ids:
                try:
                    pp_template = pp_template_store.get_template(pp_id)
                except ValueError:
                    logger.warning(f"KC test: PP template {pp_id} not found, skipping")
                    continue
                for fi in pp_template.filters:
                    try:
                        f = FilterRegistry.create_instance(fi.filter_id, fi.options)
                        result = f.process_image(img_array, image_pool)
                        if result is not None:
                            img_array = result
                    except ValueError:
                        logger.warning(f"KC test: unknown filter '{fi.filter_id}', skipping")
            pil_image = Image.fromarray(img_array)

        # 4. Extract colors from each rectangle
        img_array = np.array(pil_image)
        h, w = img_array.shape[:2]

        calc_fns = {
            "average": calculate_average_color,
            "median": calculate_median_color,
            "dominant": calculate_dominant_color,
        }
        calc_fn = calc_fns.get(settings.interpolation_mode, calculate_average_color)

        result_rects = []
        for rect in rectangles:
            px_x = max(0, int(rect.x * w))
            px_y = max(0, int(rect.y * h))
            px_w = max(1, int(rect.width * w))
            px_h = max(1, int(rect.height * h))
            px_x = min(px_x, w - 1)
            px_y = min(px_y, h - 1)
            px_w = min(px_w, w - px_x)
            px_h = min(px_h, h - px_y)

            sub_img = img_array[px_y:px_y + px_h, px_x:px_x + px_w]
            r, g, b = calc_fn(sub_img)

            result_rects.append(KCTestRectangleResponse(
                name=rect.name,
                x=rect.x,
                y=rect.y,
                width=rect.width,
                height=rect.height,
                color=ExtractedColorResponse(r=r, g=g, b=b, hex=f"#{r:02x}{g:02x}{b:02x}"),
            ))

        # 5. Encode frame as base64 JPEG
        full_buffer = io.BytesIO()
        pil_image.save(full_buffer, format='JPEG', quality=90)
        full_buffer.seek(0)
        full_b64 = base64.b64encode(full_buffer.getvalue()).decode('utf-8')
        image_data_uri = f"data:image/jpeg;base64,{full_b64}"

        return KCTestResponse(
            image=image_data_uri,
            rectangles=result_rects,
            interpolation_mode=settings.interpolation_mode,
            pattern_template_name=pattern_tmpl.name,
        )

    except HTTPException:
        raise
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except RuntimeError as e:
        raise HTTPException(status_code=500, detail=f"Capture error: {str(e)}")
    except Exception as e:
        logger.error(f"Failed to test KC target: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))
    finally:
        if stream:
            try:
                stream.cleanup()
            except Exception as e:
                logger.error(f"Error cleaning up test stream: {e}")


@router.websocket("/api/v1/picture-targets/{target_id}/ws")
async def target_colors_ws(
    websocket: WebSocket,
    target_id: str,
    token: str = Query(""),
):
    """WebSocket for real-time key color updates. Auth via ?token=<api_key>."""
    # Authenticate
    authenticated = False
    cfg = get_config()
    if token and cfg.auth.api_keys:
        for _label, api_key in cfg.auth.api_keys.items():
            if secrets.compare_digest(token, api_key):
                authenticated = True
                break

    if not authenticated:
        await websocket.close(code=4001, reason="Unauthorized")
        return

    await websocket.accept()

    manager = get_processor_manager()

    try:
        manager.add_kc_ws_client(target_id, websocket)
    except ValueError:
        await websocket.close(code=4004, reason="Target not found")
        return

    try:
        while True:
            # Keep alive — wait for client messages (or disconnect)
            await websocket.receive_text()
    except WebSocketDisconnect:
        pass
    finally:
        manager.remove_kc_ws_client(target_id, websocket)


# ===== STATE CHANGE EVENT STREAM =====


@router.websocket("/api/v1/events/ws")
async def events_ws(
    websocket: WebSocket,
    token: str = Query(""),
):
    """WebSocket for real-time state change events. Auth via ?token=<api_key>."""
    authenticated = False
    cfg = get_config()
    if token and cfg.auth.api_keys:
        for _label, api_key in cfg.auth.api_keys.items():
            if secrets.compare_digest(token, api_key):
                authenticated = True
                break

    if not authenticated:
        await websocket.close(code=4001, reason="Unauthorized")
        return

    await websocket.accept()

    manager = get_processor_manager()
    queue = manager.subscribe_events()

    try:
        while True:
            event = await queue.get()
            await websocket.send_json(event)
    except WebSocketDisconnect:
        pass
    except Exception:
        pass
    finally:
        manager.unsubscribe_events(queue)


# ===== OVERLAY VISUALIZATION =====

@router.post("/api/v1/picture-targets/{target_id}/overlay/start", tags=["Visualization"])
async def start_target_overlay(
    target_id: str,
    _auth: AuthRequired,
    manager: ProcessorManager = Depends(get_processor_manager),
    target_store: PictureTargetStore = Depends(get_picture_target_store),
):
    """Start screen overlay visualization for a target.

    Displays a transparent overlay on the target display showing:
    - Border sampling zones (colored rectangles)
    - LED position markers (numbered dots)
    - Pixel-to-LED mapping ranges (colored segments)
    - Calibration info text
    """
    try:
        # Get target name from store
        target = target_store.get_target(target_id)
        if not target:
            raise ValueError(f"Target {target_id} not found")

        await manager.start_overlay(target_id, target.name)
        return {"status": "started", "target_id": target_id}

    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except RuntimeError as e:
        raise HTTPException(status_code=409, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to start overlay: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/api/v1/picture-targets/{target_id}/overlay/stop", tags=["Visualization"])
async def stop_target_overlay(
    target_id: str,
    _auth: AuthRequired,
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Stop screen overlay visualization for a target."""
    try:
        await manager.stop_overlay(target_id)
        return {"status": "stopped", "target_id": target_id}

    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except Exception as e:
        logger.error(f"Failed to stop overlay: {e}", exc_info=True)
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/api/v1/picture-targets/{target_id}/overlay/status", tags=["Visualization"])
async def get_overlay_status(
    target_id: str,
    _auth: AuthRequired,
    manager: ProcessorManager = Depends(get_processor_manager),
):
    """Check if overlay is active for a target."""
    try:
        active = manager.is_overlay_active(target_id)
        return {"target_id": target_id, "active": active}

    except ValueError as e:
        raise HTTPException(status_code=404, detail=str(e))