"""
Unit tests for installer/core/controller.py

Covers KnoeController: check_docker_running, get_knoe_db_version, run_script.
"""
from __future__ import annotations

import os
import subprocess
from pathlib import Path
from unittest.mock import MagicMock, patch

from knoe.core.controller import KnoeController


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _make_controller(tmp_path: Path, **kwargs) -> KnoeController:
    return KnoeController(project_root=tmp_path, **kwargs)


def _scaffold_project(tmp_path: Path) -> None:
    """Create minimum project structure expected by run_script."""
    (tmp_path / "etc").mkdir(parents=True, exist_ok=True)
    (tmp_path / "conf" / "postgresql").mkdir(parents=True, exist_ok=True)
    (tmp_path / "knoe-db").mkdir(parents=True, exist_ok=True)


# ---------------------------------------------------------------------------
# check_docker_running
# ---------------------------------------------------------------------------

def test_check_docker_running_success(tmp_path):
    ctrl = _make_controller(tmp_path)
    with patch("knoe.core.controller.subprocess.run") as mock_run:
        mock_run.return_value = MagicMock(returncode=0)
        assert ctrl.check_docker_running() is True


def test_check_docker_running_called_process_error(tmp_path):
    ctrl = _make_controller(tmp_path)
    with patch("knoe.core.controller.subprocess.run",
               side_effect=subprocess.CalledProcessError(1, "docker")):
        assert ctrl.check_docker_running() is False


def test_check_docker_running_file_not_found(tmp_path):
    ctrl = _make_controller(tmp_path)
    with patch("knoe.core.controller.subprocess.run",
               side_effect=FileNotFoundError("docker not found")):
        assert ctrl.check_docker_running() is False


# ---------------------------------------------------------------------------
# get_knoe_db_version
# ---------------------------------------------------------------------------

def test_get_knoe_db_version_no_files(tmp_path):
    ctrl = _make_controller(tmp_path)
    version = ctrl.get_knoe_db_version()
    # Falls back to defaults: 17.7 and 43 (zero-padded to 3 digits → 043)
    assert version == "17.7-043"


def test_get_knoe_db_version_with_files(tmp_path):
    (tmp_path / "conf" / "postgresql").mkdir(parents=True)
    (tmp_path / "conf" / "postgresql" / ".version").write_text("18\n")
    (tmp_path / "knoe-db").mkdir(parents=True)
    (tmp_path / "knoe-db" / ".version").write_text("88\n")
    ctrl = _make_controller(tmp_path)
    version = ctrl.get_knoe_db_version()
    assert version == "18-088"


def test_get_knoe_db_version_non_numeric_release(tmp_path):
    (tmp_path / "conf" / "postgresql").mkdir(parents=True)
    (tmp_path / "conf" / "postgresql" / ".version").write_text("18\n")
    (tmp_path / "knoe-db").mkdir(parents=True)
    (tmp_path / "knoe-db" / ".version").write_text("latest\n")
    ctrl = _make_controller(tmp_path)
    version = ctrl.get_knoe_db_version()
    # Non-numeric release is not zero-padded
    assert version == "18-latest"


def test_get_knoe_db_version_only_pg_version(tmp_path):
    (tmp_path / "conf" / "postgresql").mkdir(parents=True)
    (tmp_path / "conf" / "postgresql" / ".version").write_text("17\n")
    ctrl = _make_controller(tmp_path)
    version = ctrl.get_knoe_db_version()
    assert version.startswith("17-")


def test_get_knoe_db_version_pads_single_digit_release(tmp_path):
    (tmp_path / "knoe-db").mkdir(parents=True)
    (tmp_path / "knoe-db" / ".version").write_text("5\n")
    ctrl = _make_controller(tmp_path)
    version = ctrl.get_knoe_db_version()
    assert version.endswith("-005")


# ---------------------------------------------------------------------------
# run_script
# ---------------------------------------------------------------------------

def test_run_script_basic(tmp_path):
    """run_script executes a bash script and captures stdout via on_line."""
    _scaffold_project(tmp_path)
    script = tmp_path / "etc" / "hello.sh"
    script.write_text("#!/bin/bash\necho 'hello from script'\n")
    ctrl = _make_controller(tmp_path)
    lines: list[str] = []
    rc = ctrl.run_script(
        "hello.sh",
        env={"KNOE_HOME": str(tmp_path)},
        on_line=lambda l: lines.append(l),
    )
    assert rc == 0
    assert any("hello from script" in l for l in lines)


def test_run_script_nonzero_exit(tmp_path):
    _scaffold_project(tmp_path)
    script = tmp_path / "etc" / "fail.sh"
    script.write_text("#!/bin/bash\nexit 42\n")
    ctrl = _make_controller(tmp_path)
    rc = ctrl.run_script("fail.sh", env={"KNOE_HOME": str(tmp_path)})
    assert rc == 42


def test_run_script_with_args(tmp_path):
    _scaffold_project(tmp_path)
    script = tmp_path / "etc" / "args.sh"
    script.write_text("#!/bin/bash\necho \"ARG:$1\"\n")
    ctrl = _make_controller(tmp_path)
    lines: list[str] = []
    rc = ctrl.run_script(
        "args.sh",
        args=["myvalue"],
        env={"KNOE_HOME": str(tmp_path)},
        on_line=lambda l: lines.append(l),
    )
    assert rc == 0
    assert any("ARG:myvalue" in l for l in lines)


def test_run_script_copies_k8s_and_conf(tmp_path):
    """Covers the k8s sync path and the minimal conf allowlist sync."""
    _scaffold_project(tmp_path)
    # Create source k8s and conf dirs
    (tmp_path / "k8s").mkdir()
    (tmp_path / "k8s" / "test.yaml").write_text("kind: Pod\n")
    (tmp_path / "conf" / "postgresql" / ".version").write_text("18\n")
    (tmp_path / "conf" / "database_versions.json").write_text("{}\n")
    (tmp_path / "conf" / "port-mapping.cfg").write_text("; test\n")
    script = tmp_path / "etc" / "synced.sh"
    script.write_text("#!/bin/bash\necho ok\n")
    target = tmp_path / "knoe_home_test"
    target.mkdir()
    ctrl = _make_controller(tmp_path)
    rc = ctrl.run_script("synced.sh", env={"KNOE_HOME": str(target)})
    assert rc == 0
    # k8s should have been synced
    assert (target / "k8s").exists()
    # conf allowlist should have been synced (but NOT knoe.cfg)
    assert (target / "conf" / "postgresql" / ".version").read_text() == "18\n"
    assert (target / "conf" / "database_versions.json").exists()
    assert (target / "conf" / "port-mapping.cfg").exists()
    assert not (target / "conf" / "knoe.cfg").exists()


def test_run_script_preserves_existing_knoe_cfg_symlink_entrypoint(tmp_path: Path):
    """Regression: run_script must never delete/overwrite curated $KNOE_HOME/conf/knoe.cfg layouts."""

    _scaffold_project(tmp_path)

    # Create a simple script to run.
    script = tmp_path / "etc" / "ok.sh"
    script.write_text("#!/bin/bash\necho ok\n")

    # Ensure the source project has a knoe.cfg file; destructive sync currently overwrites
    # the curated symlink entrypoint.
    (tmp_path / "conf" / "knoe.cfg").write_text("SOURCE_ENTRY\n")

    # Create a curated KNOE_HOME/conf layout with a symlink entrypoint.
    knoe_home = tmp_path / "knoe_home_curated"
    (knoe_home / "conf" / "service").mkdir(parents=True, exist_ok=True)
    service_base = knoe_home / "conf" / "service" / "knoe.cfg"
    service_base.write_text("SERVICE_BASE\n")
    entry = knoe_home / "conf" / "knoe.cfg"
    entry.symlink_to(Path("service") / "knoe.cfg")

    # Ensure the destructive sync path triggers (source conf newer than target conf).
    (tmp_path / "conf" / "__touch__.txt").write_text("x\n")

    ctrl = _make_controller(tmp_path)
    rc = ctrl.run_script("ok.sh", env={"KNOE_HOME": str(knoe_home)})
    assert rc == 0

    assert entry.exists()
    assert entry.is_symlink()
    assert service_base.exists()
    assert service_base.read_text() == "SERVICE_BASE\n"


def test_run_script_copies_etc_lib_shell_for_etc_scripts(tmp_path):
    """Regression: etc/ scripts may source etc/lib/shell/common_core_lib.sh."""
    _scaffold_project(tmp_path)

    (tmp_path / "etc" / "lib" / "shell").mkdir(parents=True, exist_ok=True)
    (tmp_path / "etc" / "lib" / "shell" / "common_core_lib.sh").write_text(
        "#!/usr/bin/env bash\ncommon_core_preparse_config() { :; }\n"
    )

    script = tmp_path / "etc" / "needs_lib.sh"
    script.write_text(
        "#!/bin/bash\n"
        "SCRIPT_DIR=$(cd \"$(dirname \"${BASH_SOURCE[0]}\")\" && pwd)\n"
        "# shellcheck disable=SC1091\n"
        "source \"$SCRIPT_DIR/lib/shell/common_core_lib.sh\"\n"
        "common_core_preparse_config\n"
        "echo ok\n"
    )

    target = tmp_path / "knoe_home_lib"
    target.mkdir()

    ctrl = _make_controller(tmp_path)
    lines: list[str] = []
    rc = ctrl.run_script(
        "needs_lib.sh",
        env={"KNOE_HOME": str(target)},
        on_line=lambda l: lines.append(l),
    )
    assert rc == 0
    assert any("ok" in l for l in lines)
    assert (target / "etc" / "lib" / "shell" / "common_core_lib.sh").exists()


def test_run_script_copies_db_version(tmp_path):
    """Covers the knoe-db/.version copy path."""
    _scaffold_project(tmp_path)
    (tmp_path / "knoe-db" / ".version").write_text("88\n")
    script = tmp_path / "etc" / "dbver.sh"
    script.write_text("#!/bin/bash\necho ok\n")
    target = tmp_path / "knoe_home_db"
    target.mkdir()
    ctrl = _make_controller(tmp_path)
    rc = ctrl.run_script("dbver.sh", env={"KNOE_HOME": str(target)})
    assert rc == 0
    assert (target / "knoe-db" / ".version").read_text().strip() == "88"


def test_run_script_default_knoe_home(tmp_path):
    """Covers the KNOE_HOME fallback to ~/.knoe when not in env."""
    _scaffold_project(tmp_path)
    script = tmp_path / "etc" / "home.sh"
    script.write_text("#!/bin/bash\necho hometest\n")
    ctrl = _make_controller(tmp_path)
    # Provide env without KNOE_HOME so it falls back to Path.home() / ".knoe"
    fake_home = tmp_path / "fakehome"
    fake_home.mkdir()
    with patch("knoe.core.controller.Path.home", return_value=fake_home):
        rc = ctrl.run_script("home.sh", env={})
    assert rc == 0


def test_run_script_stderr_to_stdout_false(tmp_path):
    """Covers the stderr_to_stdout=False thread path."""
    _scaffold_project(tmp_path)
    script = tmp_path / "etc" / "stderr.sh"
    script.write_text("#!/bin/bash\necho 'out'\n>&2 echo 'err'\n")
    ctrl = _make_controller(tmp_path)
    stderr_lines: list[str] = []
    rc = ctrl.run_script(
        "stderr.sh",
        env={"KNOE_HOME": str(tmp_path)},
        stderr_to_stdout=False,
        on_stderr_line=lambda l: stderr_lines.append(l),
    )
    assert rc == 0
    assert any("err" in l for l in stderr_lines)


def test_run_script_verbose_sets_env(tmp_path):
    """Covers the verbose env var injection path."""
    _scaffold_project(tmp_path)
    script = tmp_path / "etc" / "verbose.sh"
    script.write_text("#!/bin/bash\necho \"VERBOSE:${PROLE_VERBOSE:-unset}\"\n")
    ctrl = _make_controller(tmp_path, verbose=True)
    lines: list[str] = []
    rc = ctrl.run_script(
        "verbose.sh",
        env={"KNOE_HOME": str(tmp_path)},
        on_line=lambda l: lines.append(l),
    )
    assert rc == 0
    assert any("VERBOSE:1" in l for l in lines)


def test_run_script_missing_source_script(tmp_path):
    """If the source script doesn't exist, target script also won't exist — graceful."""
    _scaffold_project(tmp_path)
    # Don't create the script — run_script should still try to run it
    ctrl = _make_controller(tmp_path)
    # Should return non-zero (bash can't find the file) but not raise
    rc = ctrl.run_script("nonexistent.sh", env={"KNOE_HOME": str(tmp_path)})
    assert rc != 0