"""Heatmap endpoints — ATT&CK Navigator-compatible layer generation.

Thin router that delegates entirely to :mod:`app.services.heatmap_service`.
No business logic lives here — only request validation and response
formatting.
"""

import io
import json
from typing import Optional

from fastapi import APIRouter, Depends, Query
from fastapi.responses import StreamingResponse
from sqlalchemy.orm import Session

from app.database import get_db
from app.dependencies.auth import get_current_user
from app.models.user import User
from app.services import heatmap_service

router = APIRouter(prefix="/heatmap", tags=["heatmap"])


@router.get("/coverage")
def heatmap_coverage(
    platforms: Optional[str] = Query(None, description="Comma-separated platforms"),
    tactics: Optional[str] = Query(None, description="Comma-separated tactics"),
    min_score: int = Query(0, ge=0, le=100),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Coverage layer — score based on status_global of each technique."""
    return heatmap_service.build_coverage_layer(
        db, platforms=platforms, tactics=tactics, min_score=min_score,
    )


@router.get("/threat-actor/{actor_id}")
def heatmap_threat_actor(
    actor_id: str,
    platforms: Optional[str] = Query(None),
    tactics: Optional[str] = Query(None),
    min_score: int = Query(0, ge=0, le=100),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Threat actor layer — techniques used by an actor with coverage color."""
    return heatmap_service.build_threat_actor_layer(
        db, actor_id, platforms=platforms, tactics=tactics, min_score=min_score,
    )


@router.get("/detection-rules")
def heatmap_detection_rules(
    platforms: Optional[str] = Query(None),
    tactics: Optional[str] = Query(None),
    min_score: int = Query(0, ge=0, le=100),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Detection rules layer — score based on ratio of rules available vs total."""
    return heatmap_service.build_detection_rules_layer(
        db, platforms=platforms, tactics=tactics, min_score=min_score,
    )


@router.get("/campaign/{campaign_id}")
def heatmap_campaign(
    campaign_id: str,
    platforms: Optional[str] = Query(None),
    tactics: Optional[str] = Query(None),
    min_score: int = Query(0, ge=0, le=100),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Campaign layer — only techniques in the campaign, colored by test state."""
    return heatmap_service.build_campaign_layer(
        db, campaign_id, platforms=platforms, tactics=tactics, min_score=min_score,
    )


@router.get("/export-navigator")
def export_navigator(
    layer: str = Query(..., description="Layer type: coverage, threat-actor, detection-rules, campaign"),
    layer_id: Optional[str] = Query(None, description="Actor ID or Campaign ID (if applicable)"),
    platforms: Optional[str] = Query(None),
    tactics: Optional[str] = Query(None),
    min_score: int = Query(0, ge=0, le=100),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """Export a heatmap layer as a downloadable JSON file for ATT&CK Navigator."""
    data = heatmap_service.build_navigator_export(
        db, layer, layer_id=layer_id,
        platforms=platforms, tactics=tactics, min_score=min_score,
    )

    json_content = json.dumps(data, indent=2, default=str)
    buffer = io.BytesIO(json_content.encode("utf-8"))

    return StreamingResponse(
        buffer,
        media_type="application/json",
        headers={"Content-Disposition": f"attachment; filename=aegis_{layer}_layer.json"},
    )
