"""
API endpoint tests using FastAPI TestClient.
"""

import io
import json
import pandas as pd
import pytest
from fastapi.testclient import TestClient

from app.main import app


@pytest.fixture
def client():
    return TestClient(app)


def make_excel_bytes(df: pd.DataFrame) -> bytes:
    bio = io.BytesIO()
    with pd.ExcelWriter(bio, engine='openpyxl') as writer:
        df.to_excel(writer, index=False)
    return bio.getvalue()


def test_health(client):
    r = client.get("/api/health")
    assert r.status_code == 200
    data = r.json()
    assert data["status"] == "ok"
    assert data["version"] == "2.0.0"


def test_root_returns_html(client):
    r = client.get("/")
    assert r.status_code == 200
    assert "text/html" in r.headers["content-type"]
    assert "Scenar Creator" in r.text


def test_validate_valid(client):
    doc = {
        "event": {"title": "Test", "detail": "Detail"},
        "program_types": [{"code": "WS", "description": "Workshop", "color": "#FF0000"}],
        "blocks": [{
            "datum": "2025-11-13",
            "zacatek": "09:00:00",
            "konec": "10:00:00",
            "program": "Opening",
            "typ": "WS"
        }]
    }
    r = client.post("/api/validate", json=doc)
    assert r.status_code == 200
    data = r.json()
    assert data["valid"] is True
    assert data["errors"] == []


def test_validate_unknown_type(client):
    doc = {
        "event": {"title": "Test", "detail": "Detail"},
        "program_types": [{"code": "WS", "description": "Workshop", "color": "#FF0000"}],
        "blocks": [{
            "datum": "2025-11-13",
            "zacatek": "09:00:00",
            "konec": "10:00:00",
            "program": "Opening",
            "typ": "UNKNOWN"
        }]
    }
    r = client.post("/api/validate", json=doc)
    assert r.status_code == 200
    data = r.json()
    assert data["valid"] is False
    assert any("UNKNOWN" in e for e in data["errors"])


def test_validate_bad_time_order(client):
    doc = {
        "event": {"title": "Test", "detail": "Detail"},
        "program_types": [{"code": "WS", "description": "Workshop", "color": "#FF0000"}],
        "blocks": [{
            "datum": "2025-11-13",
            "zacatek": "10:00:00",
            "konec": "09:00:00",
            "program": "Bad",
            "typ": "WS"
        }]
    }
    r = client.post("/api/validate", json=doc)
    assert r.status_code == 200
    data = r.json()
    assert data["valid"] is False


def test_import_excel(client):
    df = pd.DataFrame({
        'Datum': [pd.Timestamp('2025-11-13').date()],
        'Zacatek': ['09:00'],
        'Konec': ['10:00'],
        'Program': ['Test Program'],
        'Typ': ['WORKSHOP'],
        'Garant': ['John'],
        'Poznamka': ['Note']
    })

    content = make_excel_bytes(df)
    r = client.post(
        "/api/import-excel",
        files={"file": ("test.xlsx", content, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")},
        data={"title": "Imported Event", "detail": "From Excel"}
    )

    assert r.status_code == 200
    data = r.json()
    assert data["success"] is True
    assert data["document"] is not None
    assert data["document"]["event"]["title"] == "Imported Event"
    assert len(data["document"]["blocks"]) == 1


def test_generate_excel(client):
    doc = {
        "event": {"title": "Test Event", "detail": "Test Detail"},
        "program_types": [{"code": "WS", "description": "Workshop", "color": "#0070C0"}],
        "blocks": [{
            "datum": "2025-11-13",
            "zacatek": "09:00:00",
            "konec": "10:00:00",
            "program": "Opening",
            "typ": "WS",
            "garant": "John",
            "poznamka": "Note"
        }]
    }
    r = client.post("/api/generate-excel", json=doc)
    assert r.status_code == 200
    assert "spreadsheetml" in r.headers["content-type"]
    assert len(r.content) > 0


def test_generate_excel_no_blocks(client):
    doc = {
        "event": {"title": "Test", "detail": "Detail"},
        "program_types": [{"code": "WS", "description": "Workshop", "color": "#FF0000"}],
        "blocks": []
    }
    r = client.post("/api/generate-excel", json=doc)
    assert r.status_code == 422


def test_export_json(client):
    doc = {
        "event": {"title": "Test", "detail": "Detail"},
        "program_types": [{"code": "WS", "description": "Workshop", "color": "#FF0000"}],
        "blocks": [{
            "datum": "2025-11-13",
            "zacatek": "09:00:00",
            "konec": "10:00:00",
            "program": "Opening",
            "typ": "WS"
        }]
    }
    r = client.post("/api/export-json", json=doc)
    assert r.status_code == 200
    data = r.json()
    assert data["event"]["title"] == "Test"
    assert len(data["blocks"]) == 1


def test_template_download(client):
    r = client.get("/api/template")
    # Template might not exist in test env, but endpoint should work
    assert r.status_code in [200, 404]


def test_swagger_docs(client):
    r = client.get("/docs")
    assert r.status_code == 200