"""Tests that update-agent-context.sh/.ps1 prefer feature.json over mtime."""

from __future__ import annotations

import json
import os
import time
from pathlib import Path

import pytest

from tests.conftest import requires_bash
from tests.extensions.test_extension_agent_context import (
    BASH,
    POWERSHELL,
    _bash_posix_path,
    _run_bash_agent_context_script,
    _run_powershell_agent_context_script,
)


def _setup_project(root: Path, context_file: str = "CLAUDE.md") -> None:
    """Write agent-context extension config as JSON.

    JSON is valid YAML so bash+PyYAML can parse it, and PowerShell's built-in
    ConvertFrom-Json can parse it without needing powershell-yaml or Python.
    Written directly as JSON (not via yaml.safe_dump) so the PS ConvertFrom-Json
    fallback actually works on Windows CI.
    """
    cfg_dir = root / ".specify" / "extensions" / "agent-context"
    cfg_dir.mkdir(parents=True, exist_ok=True)
    (cfg_dir / "agent-context-config.yml").write_text(
        json.dumps({
            "context_file": context_file,
            "context_markers": {
                "start": "<!-- SPECKIT START -->",
                "end": "<!-- SPECKIT END -->",
            },
        }),
        encoding="utf-8",
    )


def _write_feature_json(root: Path, feature_directory: str) -> None:
    specify_dir = root / ".specify"
    specify_dir.mkdir(parents=True, exist_ok=True)
    (specify_dir / "feature.json").write_text(
        json.dumps({"feature_directory": feature_directory}),
        encoding="utf-8",
    )


def _make_plan(root: Path, feature_dir: str, content: str = "# plan\n") -> Path:
    p = root / feature_dir / "plan.md"
    p.parent.mkdir(parents=True, exist_ok=True)
    p.write_text(content, encoding="utf-8")
    return p


@requires_bash
def test_bash_uses_feature_json_when_plan_exists(tmp_path: Path) -> None:
    """feature.json points to the active feature; that plan.md is injected."""
    _setup_project(tmp_path)
    _make_plan(tmp_path, "specs/001-active")
    _write_feature_json(tmp_path, "specs/001-active")

    result = _run_bash_agent_context_script(tmp_path)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (tmp_path / "CLAUDE.md").read_text(encoding="utf-8")
    assert "specs/001-active/plan.md" in ctx


@requires_bash
def test_bash_ignores_newer_stale_plan_when_feature_json_present(tmp_path: Path) -> None:
    """An older spec's plan.md modified more recently must NOT win over feature.json."""
    _setup_project(tmp_path)
    active = _make_plan(tmp_path, "specs/001-active")
    stale = _make_plan(tmp_path, "specs/000-stale")
    now = time.time()
    os.utime(active, (now - 10, now - 10))
    os.utime(stale, (now, now))
    _write_feature_json(tmp_path, "specs/001-active")

    result = _run_bash_agent_context_script(tmp_path)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (tmp_path / "CLAUDE.md").read_text(encoding="utf-8")
    assert "specs/001-active/plan.md" in ctx
    assert "specs/000-stale/plan.md" not in ctx


@requires_bash
def test_bash_falls_back_to_mtime_when_feature_json_absent(tmp_path: Path) -> None:
    """No feature.json → mtime fallback selects the most recently modified plan."""
    _setup_project(tmp_path)
    old = _make_plan(tmp_path, "specs/000-old")
    newer = _make_plan(tmp_path, "specs/001-newer")
    now = time.time()
    os.utime(old, (now - 10, now - 10))
    os.utime(newer, (now, now))

    result = _run_bash_agent_context_script(tmp_path)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (tmp_path / "CLAUDE.md").read_text(encoding="utf-8")
    assert "specs/001-newer/plan.md" in ctx


@requires_bash
def test_bash_falls_back_to_mtime_when_plan_not_yet_created(tmp_path: Path) -> None:
    """feature.json exists but plan.md not yet written → fall back to mtime."""
    _setup_project(tmp_path)
    _make_plan(tmp_path, "specs/000-old")
    _write_feature_json(tmp_path, "specs/001-new")

    result = _run_bash_agent_context_script(tmp_path)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (tmp_path / "CLAUDE.md").read_text(encoding="utf-8")
    assert "specs/000-old/plan.md" in ctx


@requires_bash
def test_bash_absolute_feature_dir_under_project_root(tmp_path: Path) -> None:
    """Absolute feature_directory under PROJECT_ROOT → project-relative path in context."""
    _setup_project(tmp_path)
    active = _make_plan(tmp_path, "specs/001-active")
    stale = _make_plan(tmp_path, "specs/000-stale")
    now = time.time()
    os.utime(active, (now - 10, now - 10))
    os.utime(stale, (now, now))
    # Write POSIX absolute path — mtime would pick 000-stale without feature.json
    _write_feature_json(tmp_path, _bash_posix_path(tmp_path / "specs" / "001-active"))

    result = _run_bash_agent_context_script(tmp_path)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (tmp_path / "CLAUDE.md").read_text(encoding="utf-8")
    assert "specs/001-active/plan.md" in ctx
    assert "specs/000-stale/plan.md" not in ctx
    assert _bash_posix_path(tmp_path) not in ctx


@requires_bash
def test_bash_absolute_feature_dir_outside_project_root(tmp_path: Path) -> None:
    """Absolute feature_directory outside PROJECT_ROOT → absolute path preserved in context."""
    project = tmp_path / "project"
    external = tmp_path / "external" / "001-feature"
    project.mkdir()
    external.mkdir(parents=True)
    (external / "plan.md").write_text("# plan\n", encoding="utf-8")

    _setup_project(project)
    _write_feature_json(project, _bash_posix_path(external))

    result = _run_bash_agent_context_script(project)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (project / "CLAUDE.md").read_text(encoding="utf-8")
    assert _bash_posix_path(external) + "/plan.md" in ctx


@pytest.mark.skipif(not POWERSHELL, reason="no PowerShell available")
def test_ps_uses_feature_json_when_plan_exists(tmp_path: Path) -> None:
    """PowerShell: absolute feature_directory under project root is normalized to relative path."""
    _setup_project(tmp_path)
    active = _make_plan(tmp_path, "specs/001-active")
    stale = _make_plan(tmp_path, "specs/000-stale")
    now = time.time()
    os.utime(active, (now - 10, now - 10))
    os.utime(stale, (now, now))
    # Native str() — PowerShell expects Windows-native paths, not MSYS2 /c/... form
    _write_feature_json(tmp_path, str(tmp_path / "specs" / "001-active"))

    result = _run_powershell_agent_context_script(tmp_path)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (tmp_path / "CLAUDE.md").read_text(encoding="utf-8")
    assert "at specs/001-active/plan.md" in ctx
    assert "specs/000-stale/plan.md" not in ctx
    assert tmp_path.resolve().as_posix() not in ctx


@pytest.mark.skipif(not POWERSHELL, reason="no PowerShell available")
def test_ps_ignores_newer_stale_plan_when_feature_json_present(tmp_path: Path) -> None:
    """PowerShell: stale plan touched more recently must not win over feature.json."""
    _setup_project(tmp_path)
    active = _make_plan(tmp_path, "specs/001-active")
    stale = _make_plan(tmp_path, "specs/000-stale")
    now = time.time()
    os.utime(active, (now - 10, now - 10))
    os.utime(stale, (now, now))
    _write_feature_json(tmp_path, "specs/001-active")

    result = _run_powershell_agent_context_script(tmp_path)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (tmp_path / "CLAUDE.md").read_text(encoding="utf-8")
    assert "specs/001-active/plan.md" in ctx
    assert "specs/000-stale/plan.md" not in ctx


@pytest.mark.skipif(not POWERSHELL, reason="no PowerShell available")
def test_ps_absolute_feature_dir_outside_project_root(tmp_path: Path) -> None:
    """PowerShell: absolute feature_directory outside project root → absolute path preserved."""
    project = tmp_path / "project"
    external = tmp_path / "external" / "001-feature"
    project.mkdir()
    external.mkdir(parents=True)
    (external / "plan.md").write_text("# plan\n", encoding="utf-8")

    _setup_project(project)
    _write_feature_json(project, str(external))

    result = _run_powershell_agent_context_script(project)
    assert result.returncode == 0, result.stderr + result.stdout
    ctx = (project / "CLAUDE.md").read_text(encoding="utf-8")
    assert external.resolve().as_posix() + "/plan.md" in ctx