"""
Shared fixtures for chunker tests.

Demonstrates: TDD and unit testing best practices (Interview Topic 8) — fixtures, temp files.
"""

import os
import tempfile

import pytest

from core.chunker.models import Chunk, ChunkResult


@pytest.fixture
def temp_file():
    """Create a temporary file with known content, cleaned up after test."""
    files = []

    def _create(content: bytes = b"x" * 4096):
        f = tempfile.NamedTemporaryFile(delete=False, suffix=".mp4")
        f.write(content)
        f.close()
        files.append(f.name)
        return f.name

    yield _create

    for path in files:
        if os.path.exists(path):
            os.unlink(path)


@pytest.fixture
def sample_chunk(temp_file):
    """Create a sample time-based Chunk with valid time range."""
    path = temp_file(b"x" * 1024)
    return Chunk(
        sequence=0,
        start_time=0.0,
        end_time=10.0,
        source_path=path,
        duration=10.0,
    )


@pytest.fixture
def make_chunk(temp_file):
    """Factory fixture for creating time-based chunks with specific sequence numbers."""
    path = temp_file(b"x" * 1024)

    def _make(sequence: int, duration: float = 10.0) -> Chunk:
        start = sequence * duration
        return Chunk(
            sequence=sequence,
            start_time=start,
            end_time=start + duration,
            source_path=path,
            duration=duration,
        )

    return _make


@pytest.fixture
def make_result():
    """Factory fixture for creating ChunkResults."""

    def _make(sequence: int, success: bool = True, processing_time: float = 0.01) -> ChunkResult:
        return ChunkResult(
            sequence=sequence,
            success=success,
            processing_time=processing_time,
        )

    return _make