"""Tracker-Target link management API routes."""

from typing import Any

from fastapi import APIRouter, Depends, HTTPException, Query, status
from pydantic import BaseModel
from sqlmodel import select
from sqlmodel.ext.asyncio.session import AsyncSession

from ..auth.dependencies import get_current_user
from ..database.engine import get_session
from ..database.models import (
    NotificationTarget,
    TemplateConfig,
    Tracker,
    TrackerTarget,
    TrackingConfig,
    User,
)

router = APIRouter(prefix="/api/trackers/{tracker_id}/targets", tags=["tracker-targets"])


class TrackerTargetCreate(BaseModel):
    target_id: int
    tracking_config_id: int | None = None
    template_config_id: int | None = None
    enabled: bool = True
    quiet_hours_start: str | None = None
    quiet_hours_end: str | None = None
    commands_config: dict[str, Any] | None = None


class TrackerTargetUpdate(BaseModel):
    tracking_config_id: int | None = None
    template_config_id: int | None = None
    enabled: bool | None = None
    quiet_hours_start: str | None = None
    quiet_hours_end: str | None = None
    commands_config: dict[str, Any] | None = None


@router.get("")
async def list_tracker_targets(
    tracker_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """List all target links for a tracker."""
    await _get_user_tracker(session, tracker_id, user.id)
    result = await session.exec(
        select(TrackerTarget).where(TrackerTarget.tracker_id == tracker_id)
    )
    return [await _tt_response(session, tt) for tt in result.all()]


@router.post("", status_code=status.HTTP_201_CREATED)
async def create_tracker_target(
    tracker_id: int,
    body: TrackerTargetCreate,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Link a target to a tracker with per-link configuration."""
    await _get_user_tracker(session, tracker_id, user.id)

    # Validate target exists and belongs to user
    target = await session.get(NotificationTarget, body.target_id)
    if not target or target.user_id != user.id:
        raise HTTPException(status_code=404, detail="Target not found")

    # Check for duplicate link
    result = await session.exec(
        select(TrackerTarget).where(
            TrackerTarget.tracker_id == tracker_id,
            TrackerTarget.target_id == body.target_id,
        )
    )
    if result.first():
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Target is already linked to this tracker",
        )

    # Validate config ownership
    if body.tracking_config_id:
        tc = await session.get(TrackingConfig, body.tracking_config_id)
        if not tc or tc.user_id != user.id:
            raise HTTPException(status_code=404, detail="Tracking config not found")
    if body.template_config_id:
        tpc = await session.get(TemplateConfig, body.template_config_id)
        if not tpc or (tpc.user_id != user.id and tpc.user_id != 0):
            raise HTTPException(status_code=404, detail="Template config not found")

    tt = TrackerTarget(tracker_id=tracker_id, **body.model_dump())
    session.add(tt)
    await session.commit()
    await session.refresh(tt)
    return await _tt_response(session, tt)


@router.put("/{tracker_target_id}")
async def update_tracker_target(
    tracker_id: int,
    tracker_target_id: int,
    body: TrackerTargetUpdate,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Update a tracker-target link's configuration."""
    await _get_user_tracker(session, tracker_id, user.id)
    tt = await session.get(TrackerTarget, tracker_target_id)
    if not tt or tt.tracker_id != tracker_id:
        raise HTTPException(status_code=404, detail="Tracker-target link not found")

    updates = body.model_dump(exclude_unset=True)
    # Validate config ownership if being changed
    if "tracking_config_id" in updates and updates["tracking_config_id"]:
        tc = await session.get(TrackingConfig, updates["tracking_config_id"])
        if not tc or tc.user_id != user.id:
            raise HTTPException(status_code=404, detail="Tracking config not found")
    if "template_config_id" in updates and updates["template_config_id"]:
        tpc = await session.get(TemplateConfig, updates["template_config_id"])
        if not tpc or (tpc.user_id != user.id and tpc.user_id != 0):
            raise HTTPException(status_code=404, detail="Template config not found")

    for field, value in updates.items():
        setattr(tt, field, value)
    session.add(tt)
    await session.commit()
    await session.refresh(tt)
    return await _tt_response(session, tt)


@router.delete("/{tracker_target_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_tracker_target(
    tracker_id: int,
    tracker_target_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Remove a target link from a tracker."""
    await _get_user_tracker(session, tracker_id, user.id)
    tt = await session.get(TrackerTarget, tracker_target_id)
    if not tt or tt.tracker_id != tracker_id:
        raise HTTPException(status_code=404, detail="Tracker-target link not found")
    await session.delete(tt)
    await session.commit()


@router.post("/{tracker_target_id}/test")
async def test_tracker_target(
    tracker_id: int,
    tracker_target_id: int,
    locale: str = Query("en"),
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Send a test notification to a specific linked target."""
    await _get_user_tracker(session, tracker_id, user.id)
    tt = await session.get(TrackerTarget, tracker_target_id)
    if not tt or tt.tracker_id != tracker_id:
        raise HTTPException(status_code=404, detail="Tracker-target link not found")

    target = await session.get(NotificationTarget, tt.target_id)
    if not target:
        raise HTTPException(status_code=404, detail="Target not found")

    from ..services.notifier import send_test_notification
    r = await send_test_notification(target, locale=locale)
    return {"target": target.name, **r}


@router.post("/{tracker_target_id}/test-periodic")
async def test_periodic_tracker_target(
    tracker_id: int,
    tracker_target_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Send a test periodic summary to a specific linked target."""
    await _get_user_tracker(session, tracker_id, user.id)
    tt = await session.get(TrackerTarget, tracker_target_id)
    if not tt or tt.tracker_id != tracker_id:
        raise HTTPException(status_code=404, detail="Tracker-target link not found")

    target = await session.get(NotificationTarget, tt.target_id)
    if not target:
        raise HTTPException(status_code=404, detail="Target not found")

    template_config = None
    if tt.template_config_id:
        template_config = await session.get(TemplateConfig, tt.template_config_id)
    template_str = (template_config.periodic_summary_message if template_config else "") or ""

    from ..services.notifier import send_test_template_notification
    r = await send_test_template_notification(target, "periodic_summary", template_str)
    return {"target": target.name, **r}


@router.post("/{tracker_target_id}/test-memory")
async def test_memory_tracker_target(
    tracker_id: int,
    tracker_target_id: int,
    user: User = Depends(get_current_user),
    session: AsyncSession = Depends(get_session),
):
    """Send a test memory/on-this-day notification to a specific linked target."""
    await _get_user_tracker(session, tracker_id, user.id)
    tt = await session.get(TrackerTarget, tracker_target_id)
    if not tt or tt.tracker_id != tracker_id:
        raise HTTPException(status_code=404, detail="Tracker-target link not found")

    target = await session.get(NotificationTarget, tt.target_id)
    if not target:
        raise HTTPException(status_code=404, detail="Target not found")

    template_config = None
    if tt.template_config_id:
        template_config = await session.get(TemplateConfig, tt.template_config_id)
    template_str = (template_config.memory_mode_message if template_config else "") or ""

    from ..services.notifier import send_test_template_notification
    r = await send_test_template_notification(target, "memory_mode", template_str)
    return {"target": target.name, **r}


async def _tt_response(session: AsyncSession, tt: TrackerTarget) -> dict:
    """Build tracker-target response with target details."""
    target = await session.get(NotificationTarget, tt.target_id)
    return {
        "id": tt.id,
        "tracker_id": tt.tracker_id,
        "target_id": tt.target_id,
        "target_name": target.name if target else None,
        "target_type": target.type if target else None,
        "target_icon": target.icon if target else None,
        "tracking_config_id": tt.tracking_config_id,
        "template_config_id": tt.template_config_id,
        "enabled": tt.enabled,
        "quiet_hours_start": tt.quiet_hours_start,
        "quiet_hours_end": tt.quiet_hours_end,
        "commands_config": tt.commands_config,
        "created_at": tt.created_at.isoformat(),
    }


async def _get_user_tracker(
    session: AsyncSession, tracker_id: int, user_id: int
) -> Tracker:
    tracker = await session.get(Tracker, tracker_id)
    if not tracker or tracker.user_id != user_id:
        raise HTTPException(status_code=404, detail="Tracker not found")
    return tracker