"""Regression test for task path conventions in prompts and templates."""

import re
from pathlib import Path

import pytest

ROOT = Path(__file__).resolve().parent.parent
PROMPTS_DIR = ROOT / "prompts"
TEMPLATES_DIR = ROOT / "templates"

# Legacy path pattern that should no longer appear (with placeholder).
LEGACY_PATH = re.compile(r"\{project\}/tasks/\{task-name\}/")
# Canonical path pattern that should be used instead.
CANONICAL_PATH = re.compile(r"\{project\}/\.automaton/tasks/\{task-name\}/")
# Concrete legacy path pattern: {project}/tasks/ followed by any name.
# Catches paths like {project}/tasks/onboarding/ that use concrete names.
CONCRETE_LEGACY_PATH = re.compile(r"\{project\}/tasks/[\w-]+/")


def _markdown_files(*directories: Path) -> list[Path]:
    files = []
    for directory in directories:
        if directory.exists():
            files.extend(directory.rglob("*.md"))
    return files


@pytest.mark.parametrize("path", _markdown_files(PROMPTS_DIR, TEMPLATES_DIR))
def test_no_legacy_task_paths(path: Path) -> None:
    """Every prompt/template must use the canonical .automaton/tasks path."""
    text = path.read_text(encoding="utf-8")
    legacy_matches = LEGACY_PATH.findall(text)
    assert not legacy_matches, (
        f"Found legacy task path in {path.relative_to(ROOT)}: {legacy_matches}\n"
        "Use {project}/.automaton/tasks/{task-name}/ instead."
    )


@pytest.mark.parametrize("path", _markdown_files(PROMPTS_DIR, TEMPLATES_DIR))
def test_no_concrete_legacy_task_paths(path: Path) -> None:
    """Every prompt/template must not use {project}/tasks/ with concrete task names."""
    text = path.read_text(encoding="utf-8")
    # Exclude the migration detection reference, which legitimately mentions the deprecated path.
    concrete_matches = CONCRETE_LEGACY_PATH.findall(text)
    # Filter out the onboarding migration detection section that references the legacy path.
    if concrete_matches and "Migration Check" in text:
        lines = text.splitlines()
        filtered = []
        in_migration = False
        for line in lines:
            if "Migration Check" in line or "Migration Detection" in line:
                in_migration = True
            if in_migration and line.startswith("#") and "Migration" not in line:
                in_migration = False
            if not in_migration:
                for m in CONCRETE_LEGACY_PATH.findall(line):
                    filtered.append(m)
        concrete_matches = filtered
    assert not concrete_matches, (
        f"Found concrete legacy task path in {path.relative_to(ROOT)}: {concrete_matches}\n"
        "Use {project}/.automaton/tasks/ instead of {project}/tasks/."
    )


def test_canonical_path_present_in_prompts() -> None:
    """At least one prompt uses the canonical path (sanity check)."""
    found = False
    for path in _markdown_files(PROMPTS_DIR):
        if CANONICAL_PATH.search(path.read_text(encoding="utf-8")):
            found = True
            break
    assert found, "No prompt uses the canonical {project}/.automaton/tasks/{task-name}/ path"