import base64
import json
import time
from unittest.mock import MagicMock, patch

import pytest
from fastapi import HTTPException


def _access_jwt(sub: str = "u1") -> str:
    raw = json.dumps(
        {"exp": int(time.time()) + 3600, "sub": sub}, separators=(",", ":")
    ).encode()
    payload = base64.urlsafe_b64encode(raw).decode().rstrip("=")
    return f"h.{payload}.s"


def test_token_manager_decode_user_id_sub():
    # Arrange
    from main import TokenManager

    raw = json.dumps(
        {"sub": "user-abc", "exp": int(time.time()) + 3600}, separators=(",", ":")
    ).encode()
    payload = base64.urlsafe_b64encode(raw).decode().rstrip("=")
    token = f"hdr.{payload}.sig"
    # Act
    uid = TokenManager.decode_user_id(token)
    # Assert
    assert uid == "user-abc"


def test_token_manager_decode_user_id_invalid():
    # Arrange
    from main import TokenManager

    # Act
    uid = TokenManager.decode_user_id("not-a-jwt")
    # Assert
    assert uid is None


def test_merged_annotation_settings_pascal_case():
    # Arrange
    from main import _merged_annotation_settings_payload

    raw = {
        "FramePeriodRecognition": 5,
        "ProbabilityThreshold": 0.4,
        "Altitude": 300,
        "FocalLength": 35,
        "SensorWidth": 36,
    }
    # Act
    out = _merged_annotation_settings_payload(raw)
    # Assert
    assert out["frame_period_recognition"] == 5
    assert out["probability_threshold"] == 0.4
    assert out["altitude"] == 300


def test_merged_annotation_nested_sections():
    # Arrange
    from main import _merged_annotation_settings_payload

    raw = {
        "aiRecognitionSettings": {"modelBatchSize": 4},
        "cameraSettings": {"altitude": 100},
    }
    # Act
    out = _merged_annotation_settings_payload(raw)
    # Assert
    assert out["model_batch_size"] == 4
    assert out["altitude"] == 100


def test_resolve_media_for_detect_uses_api_path_and_defaults_when_api_empty():
    # Arrange
    import main

    tm = main.TokenManager(_access_jwt(), "")
    mock_ann = MagicMock()
    mock_ann.fetch_user_ai_settings.return_value = None
    mock_ann.fetch_media_path.return_value = "/m/file.jpg"
    with patch("main.annotations_client", mock_ann):
        # Act
        cfg, path = main._resolve_media_for_detect("mid-1", tm, None)
    # Assert
    assert path == "/m/file.jpg"
    assert "paths" not in cfg
    assert "probability_threshold" not in cfg


def test_resolve_media_for_detect_override_wins():
    # Arrange
    import main

    tm = main.TokenManager(_access_jwt(), "")
    override = main.AIConfigDto(probability_threshold=0.99)
    mock_ann = MagicMock()
    mock_ann.fetch_user_ai_settings.return_value = {
        "probabilityThreshold": 0.2,
        "altitude": 500,
    }
    mock_ann.fetch_media_path.return_value = "/m/v.mp4"
    with patch("main.annotations_client", mock_ann):
        # Act
        cfg, path = main._resolve_media_for_detect("vid-1", tm, override)
    # Assert
    assert cfg["probability_threshold"] == 0.99
    assert cfg["altitude"] == 500
    assert path == "/m/v.mp4"
    assert "paths" not in cfg


def test_resolve_media_for_detect_raises_when_no_media_path():
    # Arrange
    import main

    tm = main.TokenManager(_access_jwt(), "")
    mock_ann = MagicMock()
    mock_ann.fetch_user_ai_settings.return_value = {}
    mock_ann.fetch_media_path.return_value = None
    with patch("main.annotations_client", mock_ann):
        # Act / Assert
        with pytest.raises(HTTPException) as exc:
            main._resolve_media_for_detect("missing", tm, None)
    assert exc.value.status_code == 503