"""Shared test fixtures for the wiki pipeline test suite.

All tests run against a disposable `tmp_wiki` directory — no test ever
touches the real ~/projects/wiki. Cross-platform: uses pathlib, no
platform-specific paths, and runs on both macOS and Linux/WSL.
"""

from __future__ import annotations

import importlib
import importlib.util
import json
import os
import sys
from pathlib import Path
from typing import Any

import pytest

SCRIPTS_DIR = Path(__file__).resolve().parent.parent / "scripts"


# ---------------------------------------------------------------------------
# Module loading helpers
# ---------------------------------------------------------------------------
#
# The wiki scripts use hyphenated filenames (wiki-hygiene.py etc.) which
# can't be imported via normal `import` syntax. These helpers load a script
# file as a module object so tests can exercise its functions directly.


def _load_script_module(name: str, path: Path) -> Any:
    """Load a Python script file as a module. Clears any cached version first."""
    # Clear cached imports so WIKI_DIR env changes take effect between tests
    for key in list(sys.modules):
        if key in (name, "wiki_lib"):
            del sys.modules[key]

    # Make sure scripts/ is on sys.path so intra-script imports (wiki_lib) work
    scripts_str = str(SCRIPTS_DIR)
    if scripts_str not in sys.path:
        sys.path.insert(0, scripts_str)

    spec = importlib.util.spec_from_file_location(name, path)
    assert spec is not None and spec.loader is not None
    mod = importlib.util.module_from_spec(spec)
    sys.modules[name] = mod
    spec.loader.exec_module(mod)
    return mod


# ---------------------------------------------------------------------------
# tmp_wiki fixture — builds a realistic wiki tree under a tmp path
# ---------------------------------------------------------------------------


@pytest.fixture
def tmp_wiki(tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> Path:
    """Set up a disposable wiki tree with all the directories the scripts expect.

    Sets the WIKI_DIR environment variable so all imported modules resolve
    paths against this tmp directory.
    """
    wiki = tmp_path / "wiki"
    wiki.mkdir()

    # Create the directory tree
    for sub in ["patterns", "decisions", "concepts", "environments"]:
        (wiki / sub).mkdir()
        (wiki / "staging" / sub).mkdir(parents=True)
        (wiki / "archive" / sub).mkdir(parents=True)
    (wiki / "raw" / "harvested").mkdir(parents=True)
    (wiki / "conversations").mkdir()
    (wiki / "reports").mkdir()

    # Create minimal index.md
    (wiki / "index.md").write_text(
        "# Wiki Index\n\n"
        "## Patterns\n\n"
        "## Decisions\n\n"
        "## Concepts\n\n"
        "## Environments\n\n"
    )

    # Empty state files
    (wiki / ".harvest-state.json").write_text(json.dumps({
        "harvested_urls": {},
        "skipped_urls": {},
        "failed_urls": {},
        "rejected_urls": {},
        "last_run": None,
    }))

    # Point all scripts at this tmp wiki
    monkeypatch.setenv("WIKI_DIR", str(wiki))

    return wiki


# ---------------------------------------------------------------------------
# Sample page factories
# ---------------------------------------------------------------------------


def make_page(
    wiki: Path,
    rel_path: str,
    *,
    title: str | None = None,
    ptype: str | None = None,
    confidence: str = "high",
    last_compiled: str = "2026-04-01",
    last_verified: str = "2026-04-01",
    origin: str = "manual",
    sources: list[str] | None = None,
    related: list[str] | None = None,
    body: str = "# Content\n\nA substantive page with real content so it is not a stub.\n",
    extra_fm: dict[str, Any] | None = None,
) -> Path:
    """Write a well-formed wiki page with all required frontmatter fields."""
    if sources is None:
        sources = []
    if related is None:
        related = []
    """Write a page to the tmp wiki and return its path."""
    path = wiki / rel_path
    path.parent.mkdir(parents=True, exist_ok=True)

    if title is None:
        title = path.stem.replace("-", " ").title()
    if ptype is None:
        ptype = path.parent.name.rstrip("s")

    fm_lines = [
        "---",
        f"title: {title}",
        f"type: {ptype}",
        f"confidence: {confidence}",
        f"origin: {origin}",
        f"last_compiled: {last_compiled}",
        f"last_verified: {last_verified}",
    ]
    if sources is not None:
        if sources:
            fm_lines.append("sources:")
            fm_lines.extend(f"  - {s}" for s in sources)
        else:
            fm_lines.append("sources: []")
    if related is not None:
        if related:
            fm_lines.append("related:")
            fm_lines.extend(f"  - {r}" for r in related)
        else:
            fm_lines.append("related: []")
    if extra_fm:
        for k, v in extra_fm.items():
            if isinstance(v, list):
                if v:
                    fm_lines.append(f"{k}:")
                    fm_lines.extend(f"  - {item}" for item in v)
                else:
                    fm_lines.append(f"{k}: []")
            else:
                fm_lines.append(f"{k}: {v}")
    fm_lines.append("---")

    path.write_text("\n".join(fm_lines) + "\n" + body)
    return path


def make_conversation(
    wiki: Path,
    project: str,
    filename: str,
    *,
    date: str = "2026-04-10",
    status: str = "summarized",
    messages: int = 100,
    related: list[str] | None = None,
    body: str = "## Summary\n\nTest conversation summary.\n",
) -> Path:
    """Write a conversation file to the tmp wiki."""
    proj_dir = wiki / "conversations" / project
    proj_dir.mkdir(parents=True, exist_ok=True)
    path = proj_dir / filename

    fm_lines = [
        "---",
        f"title: Test Conversation {filename}",
        "type: conversation",
        f"project: {project}",
        f"date: {date}",
        f"status: {status}",
        f"messages: {messages}",
    ]
    if related:
        fm_lines.append("related:")
        fm_lines.extend(f"  - {r}" for r in related)
    fm_lines.append("---")

    path.write_text("\n".join(fm_lines) + "\n" + body)
    return path


def make_staging_page(
    wiki: Path,
    rel_under_staging: str,
    *,
    title: str = "Pending Page",
    ptype: str = "pattern",
    staged_by: str = "wiki-harvest",
    staged_date: str = "2026-04-10",
    modifies: str | None = None,
    target_path: str | None = None,
    body: str = "# Pending\n\nStaged content body.\n",
) -> Path:
    path = wiki / "staging" / rel_under_staging
    path.parent.mkdir(parents=True, exist_ok=True)

    if target_path is None:
        target_path = rel_under_staging

    fm_lines = [
        "---",
        f"title: {title}",
        f"type: {ptype}",
        "confidence: medium",
        "origin: automated",
        "status: pending",
        f"staged_date: {staged_date}",
        f"staged_by: {staged_by}",
        f"target_path: {target_path}",
    ]
    if modifies:
        fm_lines.append(f"modifies: {modifies}")
    fm_lines.append("compilation_notes: test note")
    fm_lines.append("last_verified: 2026-04-10")
    fm_lines.append("---")

    path.write_text("\n".join(fm_lines) + "\n" + body)
    return path


# ---------------------------------------------------------------------------
# Module fixtures — each loads the corresponding script as a module
# ---------------------------------------------------------------------------


@pytest.fixture
def wiki_lib(tmp_wiki: Path) -> Any:
    """Load wiki_lib fresh against the tmp_wiki directory."""
    return _load_script_module("wiki_lib", SCRIPTS_DIR / "wiki_lib.py")


@pytest.fixture
def wiki_hygiene(tmp_wiki: Path) -> Any:
    """Load wiki-hygiene.py fresh. wiki_lib must be loaded first for its imports."""
    _load_script_module("wiki_lib", SCRIPTS_DIR / "wiki_lib.py")
    return _load_script_module("wiki_hygiene", SCRIPTS_DIR / "wiki-hygiene.py")


@pytest.fixture
def wiki_staging(tmp_wiki: Path) -> Any:
    _load_script_module("wiki_lib", SCRIPTS_DIR / "wiki_lib.py")
    return _load_script_module("wiki_staging", SCRIPTS_DIR / "wiki-staging.py")


@pytest.fixture
def wiki_harvest(tmp_wiki: Path) -> Any:
    _load_script_module("wiki_lib", SCRIPTS_DIR / "wiki_lib.py")
    return _load_script_module("wiki_harvest", SCRIPTS_DIR / "wiki-harvest.py")


# ---------------------------------------------------------------------------
# Subprocess helper — runs a script as if from the CLI, with WIKI_DIR set
# ---------------------------------------------------------------------------


@pytest.fixture
def run_script(tmp_wiki: Path):
    """Return a function that runs a script via subprocess with WIKI_DIR set."""
    import subprocess

    def _run(script_rel: str, *args: str, timeout: int = 60) -> subprocess.CompletedProcess:
        script = SCRIPTS_DIR / script_rel
        if script.suffix == ".py":
            cmd = ["python3", str(script), *args]
        else:
            cmd = ["bash", str(script), *args]
        env = os.environ.copy()
        env["WIKI_DIR"] = str(tmp_wiki)
        return subprocess.run(
            cmd,
            capture_output=True,
            text=True,
            timeout=timeout,
            env=env,
        )

    return _run