"""Tests for cron job context_from feature (issue #5439 Option C)."""

import sys
from pathlib import Path

import pytest

sys.path.insert(0, str(Path(__file__).parent.parent.parent))


@pytest.fixture
def cron_env(tmp_path, monkeypatch):
    """Isolated cron environment with temp HERMES_HOME."""
    hermes_home = tmp_path / ".hermes"
    hermes_home.mkdir()
    (hermes_home / "cron").mkdir()
    (hermes_home / "cron" / "output").mkdir()
    monkeypatch.setenv("HERMES_HOME", str(hermes_home))

    import cron.jobs as jobs_mod
    monkeypatch.setattr(jobs_mod, "HERMES_DIR", hermes_home)
    monkeypatch.setattr(jobs_mod, "CRON_DIR", hermes_home / "cron")
    monkeypatch.setattr(jobs_mod, "JOBS_FILE", hermes_home / "cron" / "jobs.json")
    monkeypatch.setattr(jobs_mod, "OUTPUT_DIR", hermes_home / "cron" / "output")

    return hermes_home


class TestJobContextFromField:
    """Test that context_from is stored and retrieved correctly."""

    def test_create_job_with_context_from_string(self, cron_env):
        from cron.jobs import create_job, get_job

        job_a = create_job(prompt="Find news", schedule="every 1h")
        job_b = create_job(
            prompt="Summarize findings",
            schedule="every 2h",
            context_from=job_a["id"],
        )

        assert job_b["context_from"] == [job_a["id"]]
        loaded = get_job(job_b["id"])
        assert loaded["context_from"] == [job_a["id"]]

    def test_create_job_with_context_from_list(self, cron_env):
        from cron.jobs import create_job, get_job

        job_a = create_job(prompt="Find news", schedule="every 1h")
        job_b = create_job(prompt="Find weather", schedule="every 1h")
        job_c = create_job(
            prompt="Summarize everything",
            schedule="every 2h",
            context_from=[job_a["id"], job_b["id"]],
        )

        assert job_c["context_from"] == [job_a["id"], job_b["id"]]

    def test_create_job_without_context_from(self, cron_env):
        from cron.jobs import create_job

        job = create_job(prompt="Hello", schedule="every 1h")
        assert job.get("context_from") is None

    def test_context_from_empty_string_normalized_to_none(self, cron_env):
        from cron.jobs import create_job

        job = create_job(prompt="Hello", schedule="every 1h", context_from="")
        assert job.get("context_from") is None

    def test_context_from_empty_list_normalized_to_none(self, cron_env):
        from cron.jobs import create_job

        job = create_job(prompt="Hello", schedule="every 1h", context_from=[])
        assert job.get("context_from") is None


class TestBuildJobPromptContextFrom:
    """Test that _build_job_prompt() injects context from referenced jobs."""

    def test_injects_latest_output(self, cron_env):
        from cron.jobs import create_job, OUTPUT_DIR
        from cron.scheduler import _build_job_prompt

        job_a = create_job(prompt="Find news", schedule="every 1h")

        # Записываем output для job_a
        output_dir = OUTPUT_DIR / job_a["id"]
        output_dir.mkdir(parents=True, exist_ok=True)
        (output_dir / "2026-04-22_10-00-00.md").write_text(
            "Today's top story: AI is everywhere.", encoding="utf-8"
        )

        job_b = create_job(
            prompt="Summarize the news",
            schedule="every 2h",
            context_from=job_a["id"],
        )

        prompt = _build_job_prompt(job_b)
        assert "Today's top story: AI is everywhere." in prompt
        assert f"Output from job '{job_a['id']}'" in prompt

    def test_uses_most_recent_output(self, cron_env):
        from cron.jobs import create_job, OUTPUT_DIR
        from cron.scheduler import _build_job_prompt
        import time

        job_a = create_job(prompt="Find news", schedule="every 1h")
        output_dir = OUTPUT_DIR / job_a["id"]
        output_dir.mkdir(parents=True, exist_ok=True)

        old_file = output_dir / "2026-04-22_08-00-00.md"
        old_file.write_text("Old output", encoding="utf-8")
        time.sleep(0.01)
        new_file = output_dir / "2026-04-22_10-00-00.md"
        new_file.write_text("New output", encoding="utf-8")

        job_b = create_job(
            prompt="Summarize", schedule="every 2h", context_from=job_a["id"]
        )
        prompt = _build_job_prompt(job_b)
        assert "New output" in prompt
        assert "Old output" not in prompt

    def test_graceful_when_no_output_yet(self, cron_env):
        from cron.jobs import create_job
        from cron.scheduler import _build_job_prompt

        job_a = create_job(prompt="Find news", schedule="every 1h")
        job_b = create_job(
            prompt="Summarize", schedule="every 2h", context_from=job_a["id"]
        )

        # job_a ещё не запускался — output dir не существует
        prompt = _build_job_prompt(job_b)
        assert "no output yet" in prompt.lower() or "not found" in prompt.lower()
        assert "Summarize" in prompt

    def test_injects_multiple_context_jobs(self, cron_env):
        from cron.jobs import create_job, OUTPUT_DIR
        from cron.scheduler import _build_job_prompt

        job_a = create_job(prompt="Find news", schedule="every 1h")
        job_b = create_job(prompt="Find weather", schedule="every 1h")

        for job, content in [(job_a, "News: AI boom"), (job_b, "Weather: Sunny")]:
            out_dir = OUTPUT_DIR / job["id"]
            out_dir.mkdir(parents=True, exist_ok=True)
            (out_dir / "2026-04-22_10-00-00.md").write_text(content, encoding="utf-8")

        job_c = create_job(
            prompt="Daily briefing",
            schedule="every 2h",
            context_from=[job_a["id"], job_b["id"]],
        )
        prompt = _build_job_prompt(job_c)
        assert "News: AI boom" in prompt
        assert "Weather: Sunny" in prompt

    def test_context_injected_before_prompt(self, cron_env):
        """Context should appear before the job's own prompt."""
        from cron.jobs import create_job, OUTPUT_DIR
        from cron.scheduler import _build_job_prompt

        job_a = create_job(prompt="Find data", schedule="every 1h")
        out_dir = OUTPUT_DIR / job_a["id"]
        out_dir.mkdir(parents=True, exist_ok=True)
        (out_dir / "2026-04-22_10-00-00.md").write_text("Context data", encoding="utf-8")

        job_b = create_job(
            prompt="Process the data above",
            schedule="every 2h",
            context_from=job_a["id"],
        )
        prompt = _build_job_prompt(job_b)
        context_pos = prompt.find("Context data")
        prompt_pos = prompt.find("Process the data above")
        assert context_pos < prompt_pos

    def test_output_truncated_at_8k_chars(self, cron_env):
        """Output longer than 8000 chars should be truncated."""
        from cron.jobs import create_job, OUTPUT_DIR
        from cron.scheduler import _build_job_prompt

        job_a = create_job(prompt="Find data", schedule="every 1h")
        out_dir = OUTPUT_DIR / job_a["id"]
        out_dir.mkdir(parents=True, exist_ok=True)
        big_output = "x" * 10000
        (out_dir / "2026-04-22_10-00-00.md").write_text(big_output, encoding="utf-8")

        job_b = create_job(
            prompt="Process", schedule="every 2h", context_from=job_a["id"]
        )
        prompt = _build_job_prompt(job_b)
        assert "truncated" in prompt
        assert "x" * 10000 not in prompt

    def test_graceful_when_file_deleted_between_listing_and_reading(self, cron_env):
        """Job should not crash if output file is deleted mid-read."""
        from cron.jobs import create_job, OUTPUT_DIR
        from cron.scheduler import _build_job_prompt
        from unittest.mock import patch

        job_a = create_job(prompt="Find data", schedule="every 1h")
        out_dir = OUTPUT_DIR / job_a["id"]
        out_dir.mkdir(parents=True, exist_ok=True)
        (out_dir / "2026-04-22_10-00-00.md").write_text("Some output", encoding="utf-8")

        job_b = create_job(
            prompt="Process", schedule="every 2h", context_from=job_a["id"]
        )

        # Simulate file deleted between glob() and read_text()
        original_read = Path.read_text
        def mock_read_text(self, *args, **kwargs):
            if self.suffix == ".md":
                raise FileNotFoundError("file deleted mid-read")
            return original_read(self, *args, **kwargs)

        with patch.object(Path, "read_text", mock_read_text):
            prompt = _build_job_prompt(job_b)

        # Job should not crash, prompt should still contain the base prompt
        assert "Process" in prompt

    def test_invalid_job_id_skipped(self, cron_env):
        """context_from with path traversal job_id should be skipped."""
        from cron.jobs import create_job
        from cron.scheduler import _build_job_prompt

        job = create_job(prompt="Process", schedule="every 2h")
        # Manually inject invalid context_from (simulating tampered jobs.json)
        job["context_from"] = ["../../../etc/passwd"]
        prompt = _build_job_prompt(job)
        # Should not crash and should not inject anything malicious
        assert "Process" in prompt
        assert "etc/passwd" not in prompt