import json
import shutil
import subprocess
import sys
from pathlib import Path

import pytest


def test_ffmpeg_exists_or_skip():
    if shutil.which("ffmpeg") is None:
        pytest.skip("ffmpeg not found in PATH (required for rendering).")
    p = subprocess.run(["ffmpeg", "-version"], stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
    assert p.returncode == 0


def test_selection_parsing_logic():
    # Minimal expectation for selection parsing behavior
    def parse(selection: str, n: int):
        s = selection.strip().lower()
        if s in {"all", "auto"}:
            return list(range(n))
        out = []
        for part in [p.strip() for p in s.split(",") if p.strip()]:
            if "-" in part:
                a, b = part.split("-", 1)
                a_i = int(a) - 1
                b_i = int(b) - 1
                if a_i > b_i:
                    a_i, b_i = b_i, a_i
                out.extend(list(range(a_i, b_i + 1)))
            else:
                out.append(int(part) - 1)
        # unique + clamp
        seen = set()
        filtered = []
        for i in out:
            if 0 <= i < n and i not in seen:
                seen.add(i)
                filtered.append(i)
        return filtered

    assert parse("all", 5) == [0, 1, 2, 3, 4]
    assert parse("auto", 3) == [0, 1, 2]
    assert parse("1,3,5", 5) == [0, 2, 4]
    assert parse("1-3", 10) == [0, 1, 2]
    assert parse("3-1", 10) == [0, 1, 2]
    assert parse("1-2,2-3", 10) == [0, 1, 2]


def test_example_report_schema_if_present():
    # If the example JSON exists in repo root, validate basic schema.
    root = Path(".").resolve()
    ex = root / "example_teaser_report.json"
    if not ex.exists():
        pytest.skip("example_teaser_report.json not present in this environment.")
    data = json.loads(ex.read_text(encoding="utf-8"))
    assert "version" in data
    assert "settings" in data
    assert "tracks" in data
    assert isinstance(data["tracks"], list)

    if data["tracks"]:
        t0 = data["tracks"][0]
        assert "filename" in t0
        if data.get("version") == "v3":
            assert "camelot" in t0


def test_cli_wrapper_help_runs():
    # Ensure autoclip.py exists and prints help without crashing.
    root = Path(".").resolve()
    cli = root / "autoclip.py"
    if not cli.exists():
        pytest.skip("autoclip.py not present in this environment.")
    p = subprocess.run([sys.executable, str(cli), "--help"], stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
    assert p.returncode == 0
    assert "Auto Clip" in (p.stdout + p.stderr)