from pathlib import Path
from subprocess import CalledProcessError
from types import SimpleNamespace

import pytest

from hermes_cli import config as hermes_config
from hermes_cli import main as hermes_main


def test_stash_local_changes_if_needed_returns_none_when_tree_clean(monkeypatch, tmp_path):
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[-2:] == ["status", "--porcelain"]:
            return SimpleNamespace(stdout="", returncode=0)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    stash_ref = hermes_main._stash_local_changes_if_needed(["git"], tmp_path)

    assert stash_ref is None
    assert [cmd[-2:] for cmd, _ in calls] == [["status", "--porcelain"]]


def test_stash_local_changes_if_needed_returns_specific_stash_commit(monkeypatch, tmp_path):
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[-2:] == ["status", "--porcelain"]:
            return SimpleNamespace(stdout=" M hermes_cli/main.py\n?? notes.txt\n", returncode=0)
        if cmd[1:4] == ["stash", "push", "--include-untracked"]:
            return SimpleNamespace(stdout="Saved working directory\n", returncode=0)
        if cmd[-3:] == ["rev-parse", "--verify", "refs/stash"]:
            return SimpleNamespace(stdout="abc123\n", returncode=0)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    stash_ref = hermes_main._stash_local_changes_if_needed(["git"], tmp_path)

    assert stash_ref == "abc123"
    assert calls[1][0][1:4] == ["stash", "push", "--include-untracked"]
    assert calls[2][0][-3:] == ["rev-parse", "--verify", "refs/stash"]


def test_resolve_stash_selector_returns_matching_entry(monkeypatch, tmp_path):
    def fake_run(cmd, **kwargs):
        assert cmd == ["git", "stash", "list", "--format=%gd %H"]
        return SimpleNamespace(
            stdout="stash@{0} def456\nstash@{1} abc123\n",
            returncode=0,
        )

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    assert hermes_main._resolve_stash_selector(["git"], tmp_path, "abc123") == "stash@{1}"



def test_restore_stashed_changes_prompts_before_applying(monkeypatch, tmp_path, capsys):
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[1:3] == ["stash", "apply"]:
            return SimpleNamespace(stdout="applied\n", stderr="", returncode=0)
        if cmd[1:3] == ["diff", "--name-only"]:
            return SimpleNamespace(stdout="", stderr="", returncode=0)
        if cmd[1:3] == ["stash", "list"]:
            return SimpleNamespace(stdout="stash@{1} abc123\n", stderr="", returncode=0)
        if cmd[1:3] == ["stash", "drop"]:
            return SimpleNamespace(stdout="dropped\n", stderr="", returncode=0)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)
    monkeypatch.setattr("builtins.input", lambda: "")

    restored = hermes_main._restore_stashed_changes(["git"], tmp_path, "abc123", prompt_user=True)

    assert restored is True
    assert calls[0][0] == ["git", "stash", "apply", "abc123"]
    assert calls[1][0] == ["git", "diff", "--name-only", "--diff-filter=U"]
    assert calls[2][0] == ["git", "stash", "list", "--format=%gd %H"]
    assert calls[3][0] == ["git", "stash", "drop", "stash@{1}"]
    out = capsys.readouterr().out
    assert "Restore local changes now? [Y/n]" in out
    assert "restored on top of the updated codebase" in out
    assert "git diff" in out
    assert "git status" in out


def test_restore_stashed_changes_can_skip_restore_and_keep_stash(monkeypatch, tmp_path, capsys):
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)
    monkeypatch.setattr("builtins.input", lambda: "n")

    restored = hermes_main._restore_stashed_changes(["git"], tmp_path, "abc123", prompt_user=True)

    assert restored is False
    assert calls == []
    out = capsys.readouterr().out
    assert "Restore local changes now? [Y/n]" in out
    assert "Your changes are still preserved in git stash." in out
    assert "git stash apply abc123" in out


def test_restore_stashed_changes_applies_without_prompt_when_disabled(monkeypatch, tmp_path, capsys):
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[1:3] == ["stash", "apply"]:
            return SimpleNamespace(stdout="applied\n", stderr="", returncode=0)
        if cmd[1:3] == ["diff", "--name-only"]:
            return SimpleNamespace(stdout="", stderr="", returncode=0)
        if cmd[1:3] == ["stash", "list"]:
            return SimpleNamespace(stdout="stash@{0} abc123\n", stderr="", returncode=0)
        if cmd[1:3] == ["stash", "drop"]:
            return SimpleNamespace(stdout="dropped\n", stderr="", returncode=0)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    restored = hermes_main._restore_stashed_changes(["git"], tmp_path, "abc123", prompt_user=False)

    assert restored is True
    assert calls[0][0] == ["git", "stash", "apply", "abc123"]
    assert calls[1][0] == ["git", "diff", "--name-only", "--diff-filter=U"]
    assert calls[2][0] == ["git", "stash", "list", "--format=%gd %H"]
    assert calls[3][0] == ["git", "stash", "drop", "stash@{0}"]
    assert "Restore local changes now?" not in capsys.readouterr().out



def test_print_stash_cleanup_guidance_with_selector(capsys):
    hermes_main._print_stash_cleanup_guidance("abc123", "stash@{2}")

    out = capsys.readouterr().out
    assert "Check `git status` first" in out
    assert "git stash list --format='%gd %H %s'" in out
    assert "git stash drop stash@{2}" in out



def test_restore_stashed_changes_keeps_going_when_stash_entry_cannot_be_resolved(monkeypatch, tmp_path, capsys):
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[1:3] == ["stash", "apply"]:
            return SimpleNamespace(stdout="applied\n", stderr="", returncode=0)
        if cmd[1:3] == ["diff", "--name-only"]:
            return SimpleNamespace(stdout="", stderr="", returncode=0)
        if cmd[1:3] == ["stash", "list"]:
            return SimpleNamespace(stdout="stash@{0} def456\n", stderr="", returncode=0)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    restored = hermes_main._restore_stashed_changes(["git"], tmp_path, "abc123", prompt_user=False)

    assert restored is True
    assert calls[0] == (["git", "stash", "apply", "abc123"], {"cwd": tmp_path, "capture_output": True, "text": True})
    assert calls[1] == (["git", "diff", "--name-only", "--diff-filter=U"], {"cwd": tmp_path, "capture_output": True, "text": True})
    assert calls[2] == (["git", "stash", "list", "--format=%gd %H"], {"cwd": tmp_path, "capture_output": True, "text": True, "check": True})
    out = capsys.readouterr().out
    assert "couldn't find the stash entry to drop" in out
    assert "stash was left in place" in out
    assert "Check `git status` first" in out
    assert "git stash list --format='%gd %H %s'" in out
    assert "Look for commit abc123" in out



def test_restore_stashed_changes_keeps_going_when_drop_fails(monkeypatch, tmp_path, capsys):
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[1:3] == ["stash", "apply"]:
            return SimpleNamespace(stdout="applied\n", stderr="", returncode=0)
        if cmd[1:3] == ["diff", "--name-only"]:
            return SimpleNamespace(stdout="", stderr="", returncode=0)
        if cmd[1:3] == ["stash", "list"]:
            return SimpleNamespace(stdout="stash@{0} abc123\n", stderr="", returncode=0)
        if cmd[1:3] == ["stash", "drop"]:
            return SimpleNamespace(stdout="", stderr="drop failed\n", returncode=1)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    restored = hermes_main._restore_stashed_changes(["git"], tmp_path, "abc123", prompt_user=False)

    assert restored is True
    assert calls[3][0] == ["git", "stash", "drop", "stash@{0}"]
    out = capsys.readouterr().out
    assert "couldn't drop the saved stash entry" in out
    assert "drop failed" in out
    assert "Check `git status` first" in out
    assert "git stash list --format='%gd %H %s'" in out
    assert "git stash drop stash@{0}" in out


def test_restore_stashed_changes_prompts_before_reset_on_conflict(monkeypatch, tmp_path, capsys):
    """When conflicts occur interactively, user is prompted before reset."""
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[1:3] == ["stash", "apply"]:
            return SimpleNamespace(stdout="conflict output\n", stderr="conflict stderr\n", returncode=1)
        if cmd[1:3] == ["diff", "--name-only"]:
            return SimpleNamespace(stdout="hermes_cli/main.py\n", stderr="", returncode=0)
        if cmd[1:3] == ["reset", "--hard"]:
            return SimpleNamespace(stdout="", stderr="", returncode=0)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)
    monkeypatch.setattr("builtins.input", lambda: "y")

    with pytest.raises(SystemExit, match="1"):
        hermes_main._restore_stashed_changes(["git"], tmp_path, "abc123", prompt_user=True)

    out = capsys.readouterr().out
    assert "Conflicted files:" in out
    assert "hermes_cli/main.py" in out
    assert "stashed changes are preserved" in out
    assert "Reset working tree to clean state" in out
    assert "Working tree reset to clean state" in out
    reset_calls = [c for c, _ in calls if c[1:3] == ["reset", "--hard"]]
    assert len(reset_calls) == 1


def test_restore_stashed_changes_user_declines_reset(monkeypatch, tmp_path, capsys):
    """When user declines reset, working tree is left as-is."""
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[1:3] == ["stash", "apply"]:
            return SimpleNamespace(stdout="", stderr="conflict\n", returncode=1)
        if cmd[1:3] == ["diff", "--name-only"]:
            return SimpleNamespace(stdout="cli.py\n", stderr="", returncode=0)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)
    # First input: "y" to restore, second input: "n" to decline reset
    inputs = iter(["y", "n"])
    monkeypatch.setattr("builtins.input", lambda: next(inputs))

    with pytest.raises(SystemExit, match="1"):
        hermes_main._restore_stashed_changes(["git"], tmp_path, "abc123", prompt_user=True)

    out = capsys.readouterr().out
    assert "left as-is" in out
    reset_calls = [c for c, _ in calls if c[1:3] == ["reset", "--hard"]]
    assert len(reset_calls) == 0


def test_restore_stashed_changes_auto_resets_non_interactive(monkeypatch, tmp_path, capsys):
    """Non-interactive mode auto-resets without prompting."""
    calls = []

    def fake_run(cmd, **kwargs):
        calls.append((cmd, kwargs))
        if cmd[1:3] == ["stash", "apply"]:
            return SimpleNamespace(stdout="applied\n", stderr="", returncode=0)
        if cmd[1:3] == ["diff", "--name-only"]:
            return SimpleNamespace(stdout="cli.py\n", stderr="", returncode=0)
        if cmd[1:3] == ["reset", "--hard"]:
            return SimpleNamespace(stdout="", stderr="", returncode=0)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    with pytest.raises(SystemExit, match="1"):
        hermes_main._restore_stashed_changes(["git"], tmp_path, "abc123", prompt_user=False)

    out = capsys.readouterr().out
    assert "Working tree reset to clean state" in out
    reset_calls = [c for c, _ in calls if c[1:3] == ["reset", "--hard"]]
    assert len(reset_calls) == 1


def test_stash_local_changes_if_needed_raises_when_stash_ref_missing(monkeypatch, tmp_path):
    def fake_run(cmd, **kwargs):
        if cmd[-2:] == ["status", "--porcelain"]:
            return SimpleNamespace(stdout=" M hermes_cli/main.py\n", returncode=0)
        if cmd[1:4] == ["stash", "push", "--include-untracked"]:
            return SimpleNamespace(stdout="Saved working directory\n", returncode=0)
        if cmd[-3:] == ["rev-parse", "--verify", "refs/stash"]:
            raise CalledProcessError(returncode=128, cmd=cmd)
        raise AssertionError(f"unexpected command: {cmd}")

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    with pytest.raises(CalledProcessError):
        hermes_main._stash_local_changes_if_needed(["git"], Path(tmp_path))


# ---------------------------------------------------------------------------
# Update uses .[all] with fallback to .
# ---------------------------------------------------------------------------

def _setup_update_mocks(monkeypatch, tmp_path):
    """Common setup for cmd_update tests."""
    (tmp_path / ".git").mkdir()
    monkeypatch.setattr(hermes_main, "PROJECT_ROOT", tmp_path)
    monkeypatch.setattr(hermes_main, "_stash_local_changes_if_needed", lambda *a, **kw: None)
    monkeypatch.setattr(hermes_main, "_restore_stashed_changes", lambda *a, **kw: True)
    monkeypatch.setattr(hermes_config, "get_missing_env_vars", lambda required_only=True: [])
    monkeypatch.setattr(hermes_config, "get_missing_config_fields", lambda: [])
    monkeypatch.setattr(hermes_config, "check_config_version", lambda: (5, 5))
    monkeypatch.setattr(hermes_config, "migrate_config", lambda **kw: {"env_added": [], "config_added": []})


def test_cmd_update_tries_extras_first_then_falls_back(monkeypatch, tmp_path):
    """When .[all] fails, update should fall back to . instead of aborting."""
    _setup_update_mocks(monkeypatch, tmp_path)
    monkeypatch.setattr("shutil.which", lambda name: "/usr/bin/uv" if name == "uv" else None)

    recorded = []

    def fake_run(cmd, **kwargs):
        recorded.append(cmd)
        if cmd == ["git", "fetch", "origin"]:
            return SimpleNamespace(stdout="", stderr="", returncode=0)
        if cmd == ["git", "rev-parse", "--abbrev-ref", "HEAD"]:
            return SimpleNamespace(stdout="main\n", stderr="", returncode=0)
        if cmd == ["git", "rev-list", "HEAD..origin/main", "--count"]:
            return SimpleNamespace(stdout="1\n", stderr="", returncode=0)
        if cmd == ["git", "pull", "origin", "main"]:
            return SimpleNamespace(stdout="Updating\n", stderr="", returncode=0)
        # .[all] fails
        if ".[all]" in cmd:
            raise CalledProcessError(returncode=1, cmd=cmd)
        # bare . succeeds
        if cmd == ["/usr/bin/uv", "pip", "install", "-e", ".", "--quiet"]:
            return SimpleNamespace(returncode=0)
        return SimpleNamespace(returncode=0)

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    hermes_main.cmd_update(SimpleNamespace())

    install_cmds = [c for c in recorded if "pip" in c and "install" in c]
    assert len(install_cmds) == 2
    assert ".[all]" in install_cmds[0]
    assert "." in install_cmds[1] and ".[all]" not in install_cmds[1]


def test_cmd_update_succeeds_with_extras(monkeypatch, tmp_path):
    """When .[all] succeeds, no fallback should be attempted."""
    _setup_update_mocks(monkeypatch, tmp_path)
    monkeypatch.setattr("shutil.which", lambda name: "/usr/bin/uv" if name == "uv" else None)

    recorded = []

    def fake_run(cmd, **kwargs):
        recorded.append(cmd)
        if cmd == ["git", "fetch", "origin"]:
            return SimpleNamespace(stdout="", stderr="", returncode=0)
        if cmd == ["git", "rev-parse", "--abbrev-ref", "HEAD"]:
            return SimpleNamespace(stdout="main\n", stderr="", returncode=0)
        if cmd == ["git", "rev-list", "HEAD..origin/main", "--count"]:
            return SimpleNamespace(stdout="1\n", stderr="", returncode=0)
        if cmd == ["git", "pull", "origin", "main"]:
            return SimpleNamespace(stdout="Updating\n", stderr="", returncode=0)
        return SimpleNamespace(returncode=0)

    monkeypatch.setattr(hermes_main.subprocess, "run", fake_run)

    hermes_main.cmd_update(SimpleNamespace())

    install_cmds = [c for c in recorded if "pip" in c and "install" in c]
    assert len(install_cmds) == 1
    assert ".[all]" in install_cmds[0]
