"""Scenario API endpoints: health, validate, sample."""

import json
import os

from fastapi import APIRouter
from fastapi.responses import JSONResponse

from app.config import VERSION
from app.models.event import ScenarioDocument
from app.models.responses import HealthResponse, ValidationResponse

router = APIRouter()


@router.get("/health", response_model=HealthResponse)
async def health():
    return HealthResponse(version=VERSION)


@router.post("/validate", response_model=ValidationResponse)
async def validate_scenario(doc: ScenarioDocument):
    """Validate a ScenarioDocument."""
    errors = []

    if not doc.blocks:
        errors.append("No blocks defined")

    if not doc.program_types:
        errors.append("No program types defined")

    type_ids = {pt.id for pt in doc.program_types}
    for i, block in enumerate(doc.blocks):
        if block.type_id not in type_ids:
            errors.append(f"Block {i+1}: unknown type '{block.type_id}'")
        if block.start >= block.end:
            errors.append(f"Block {i+1}: start time must be before end time")

    return ValidationResponse(valid=len(errors) == 0, errors=errors)


@router.get("/sample")
async def get_sample():
    """Return sample ScenarioDocument JSON."""
    sample_path = os.path.join(os.path.dirname(__file__), "..", "static", "sample.json")
    sample_path = os.path.abspath(sample_path)

    with open(sample_path, "r", encoding="utf-8") as f:
        data = json.load(f)

    return JSONResponse(
        content=data,
        headers={"Content-Disposition": "attachment; filename=sample.json"}
    )