"""
Tests for CLI init parameter resolution and command behaviour.

cmd_init resolution order: flag > config > system derivation.
All three identity fields (username, fullname, email) follow this pattern.
"""

import argparse
from unittest.mock import patch

import pytest

from local_identity.cli import _resolve_init_params, cmd_init
from local_identity.store import init_dirs, list_users, read_config, read_user


def _args(username=None, fullname=None, email=None, force=False):
    """Build a minimal Namespace for _resolve_init_params / cmd_init."""
    ns = argparse.Namespace()
    ns.username = username
    ns.fullname = fullname
    ns.email = email
    ns.force = force
    ns.func = cmd_init
    return ns


# ------------------------------------------------------------------ #
# _resolve_init_params                                                #
# ------------------------------------------------------------------ #

class TestResolveInitParams:
    def test_flags_take_priority_over_config_and_system(self):
        config = {"username": "from_config", "fullname": "Config Name", "email": "config@x.com"}
        with (
            patch("local_identity.cli.current_username", return_value="system_user"),
            patch("local_identity.cli.get_gecos_fullname", return_value="System Name"),
        ):
            u, f, e = _resolve_init_params(
                _args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"),
                config,
            )
        assert u == "tegwick"
        assert f == "Bernd Worsch"
        assert e == "bernd@example.com"

    def test_config_takes_priority_over_system(self):
        config = {"username": "tegwick", "fullname": "Bernd Worsch", "email": "bernd@example.com"}
        with (
            patch("local_identity.cli.current_username", return_value="worsch"),
            patch("local_identity.cli.get_gecos_fullname", return_value="worsch"),
        ):
            u, f, e = _resolve_init_params(_args(), config)
        assert u == "tegwick"
        assert f == "Bernd Worsch"
        assert e == "bernd@example.com"

    def test_system_derivation_when_no_flags_or_config(self):
        config = {}
        with (
            patch("local_identity.cli.current_username", return_value="worsch"),
            patch("local_identity.cli.get_gecos_fullname", return_value="Bernd Worsch"),
        ):
            u, f, e = _resolve_init_params(_args(), config)
        assert u == "worsch"
        assert f == "Bernd Worsch"
        assert e == ""  # no default; caller must prompt

    def test_flag_username_overrides_config_username(self):
        config = {"username": "wrong", "fullname": "X", "email": "x@x.com"}
        with patch("local_identity.cli.current_username", return_value="system"):
            u, _, _ = _resolve_init_params(_args(username="tegwick"), config)
        assert u == "tegwick"

    def test_flag_fullname_overrides_config_fullname(self):
        config = {"username": "u", "fullname": "Wrong Name", "email": "x@x.com"}
        with patch("local_identity.cli.get_gecos_fullname", return_value="Gecos Name"):
            _, f, _ = _resolve_init_params(_args(fullname="Bernd Worsch"), config)
        assert f == "Bernd Worsch"

    def test_gecos_used_when_no_fullname_flag_or_config(self):
        config = {"username": "tegwick", "email": "x@x.com"}
        with patch("local_identity.cli.get_gecos_fullname", return_value="Bernd Worsch"):
            _, f, _ = _resolve_init_params(_args(), config)
        assert f == "Bernd Worsch"

    def test_empty_email_when_absent_everywhere(self):
        config = {"username": "u", "fullname": "N"}
        _, _, e = _resolve_init_params(_args(), config)
        assert e == ""


# ------------------------------------------------------------------ #
# cmd_init integration (uses tmp_store fixture)                       #
# ------------------------------------------------------------------ #

class TestCmdInit:
    def test_init_with_all_flags(self, tmp_store):
        with (
            patch("local_identity.cli.current_username", return_value="worsch"),
            patch("local_identity.cli.get_gecos_fullname", return_value="worsch"),
        ):
            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))

        primary = read_user("tegwick")
        assert primary.username == "tegwick"
        assert primary.fullname == "Bernd Worsch"
        assert primary.email == "bernd@example.com"

    def test_test_users_derived_from_override_username(self, tmp_store):
        with patch("local_identity.cli.current_username", return_value="worsch"):
            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))

        users = {u.username for u in list_users()}
        assert users == {"tegwick", "tegwick1", "tegwick2"}

    def test_test_user_email_uses_override_email(self, tmp_store):
        with patch("local_identity.cli.current_username", return_value="worsch"):
            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))

        assert read_user("tegwick1").email == "bernd+test1@example.com"
        assert read_user("tegwick2").email == "bernd+test2@example.com"

    def test_overrides_persisted_to_config(self, tmp_store):
        with patch("local_identity.cli.current_username", return_value="worsch"):
            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))

        cfg = read_config()
        assert cfg["username"] == "tegwick"
        assert cfg["fullname"] == "Bernd Worsch"
        assert cfg["email"] == "bernd@example.com"

    def test_force_reinit_reads_config_without_flags(self, tmp_store):
        with patch("local_identity.cli.current_username", return_value="worsch"):
            cmd_init(_args(username="tegwick", fullname="Bernd Worsch", email="bernd@example.com"))
            # Second init with --force and no flags — should reuse config
            cmd_init(_args(force=True))

        primary = read_user("tegwick")
        assert primary.username == "tegwick"
        assert primary.fullname == "Bernd Worsch"

    def test_fails_if_store_exists_without_force(self, tmp_store):
        with (
            patch("local_identity.cli.current_username", return_value="worsch"),
            pytest.raises(SystemExit) as exc_info,
        ):
            cmd_init(_args(email="a@b.com"))
            cmd_init(_args(email="a@b.com"))  # second call should fail

        assert exc_info.value.code == 1