"""REQ-104: environment JSON schema + qa/prod/dr bindings + load()."""
import json
import sys
from pathlib import Path

import jsonschema
import pytest

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

from core.environment_check import load, check

ENV_DIR = ROOT / "core" / "environments"
SCHEMA = ROOT / "schemas" / "environment.schema.json"

ENV_FILES = ["dev.json", "qa.json", "prod.json", "dr.json"]


def _schema():
    return json.loads(SCHEMA.read_text())


@pytest.mark.parametrize("env_file", ENV_FILES)
def test_env_file_validates_against_schema(env_file):
    env = json.loads((ENV_DIR / env_file).read_text())
    jsonschema.validate(env, _schema())


def test_dev_env_has_expected_fields():
    env = load("dev")
    assert env["name"] == "dev"
    # P03 W3 (REQ-319, D-203): dev is bound to the real account.
    assert env["account_id"] == "581513795199"
    assert env["region"] == "us-east-1"
    assert env["autonomy"] == "full"
    assert env["confidence_threshold"] == 0.50
    assert "state_backend" in env
    assert "bucket" in env["state_backend"]
    assert env["state_backend"]["bucket"] == "nova-tfstate-581513795199-us-east-1"
    assert "network" in env


def test_qa_env_attested_with_075_threshold():
    env = load("qa")
    assert env["autonomy"] == "attested"
    assert env["confidence_threshold"] == 0.75


def test_prod_env_attested_with_090_threshold():
    env = load("prod")
    assert env["autonomy"] == "attested"
    assert env["confidence_threshold"] == 0.90


def test_dr_env_attested_with_095_threshold():
    env = load("dr")
    assert env["autonomy"] == "attested"
    assert env["confidence_threshold"] == 0.95


def test_load_unknown_env_raises():
    with pytest.raises(FileNotFoundError):
        load("nonexistent")


def test_load_returns_dict():
    env = load("dev")
    assert isinstance(env, dict)


def test_placeholder_account_warning_for_non_dev(capsys):
    """A stderr warning is emitted when account_id is the placeholder and env != dev."""
    load("qa")
    captured = capsys.readouterr()
    assert "placeholder account_id" in captured.err
    assert "qa" in captured.err


def test_no_warning_for_dev_placeholder(capsys):
    load("dev")
    captured = capsys.readouterr()
    assert "placeholder account_id" not in captured.err


def test_check_still_works_for_dev():
    ok, msg = check(env_name="dev")
    assert ok is True


def test_check_fails_for_unknown_env():
    ok, msg = check(env_name="nonexistent")
    assert ok is False
    assert "nonexistent" in msg


def test_account_id_is_12_digits():
    for env_file in ENV_FILES:
        env = json.loads((ENV_DIR / env_file).read_text())
        assert len(env["account_id"]) == 12
        assert env["account_id"].isdigit()


def test_v14_schema_rejects_undocumented_fields():
    """v1.14 (REQ-145): additionalProperties: false rejects unknown fields."""
    schema = json.loads(SCHEMA.read_text())
    bad_env = {
        "name": "dev",
        "account_id": "123456789012",
        "region": "us-east-1",
        "state_backend": {"bucket": "test", "lock_table": "test"},
        "network": {"vpc_cidr": "10.0.0.0/16", "azs": ["us-east-1a"]},
        "runner_role_arn": "arn:aws:iam::123456789012:role/test",
        "autonomy": "full",
        "confidence_threshold": 0.5,
        "rogue_field": "should be rejected"
    }
    with pytest.raises(jsonschema.ValidationError, match="Additional properties are not allowed"):
        jsonschema.validate(bad_env, schema)


def test_v14_schema_validates_bucket_name_format():
    """v1.14 (REQ-145): state_backend.bucket must match S3 naming rules."""
    schema = json.loads(SCHEMA.read_text())
    bad_env = {
        "name": "dev", "account_id": "123456789012", "region": "us-east-1",
        "state_backend": {"bucket": "Invalid_Bucket!", "lock_table": "test"},
        "network": {"vpc_cidr": "10.0.0.0/16", "azs": ["us-east-1a"]},
        "runner_role_arn": "arn:aws:iam::123456789012:role/test",
        "autonomy": "full", "confidence_threshold": 0.5
    }
    with pytest.raises(jsonschema.ValidationError, match="does not match"):
        jsonschema.validate(bad_env, schema)


def test_v14_schema_validates_arn_format():
    """v1.14 (REQ-145): runner_role_arn must match ARN format."""
    schema = json.loads(SCHEMA.read_text())
    bad_env = {
        "name": "dev", "account_id": "123456789012", "region": "us-east-1",
        "state_backend": {"bucket": "test", "lock_table": "test"},
        "network": {"vpc_cidr": "10.0.0.0/16", "azs": ["us-east-1a"]},
        "runner_role_arn": "not-an-arn",
        "autonomy": "full", "confidence_threshold": 0.5
    }
    with pytest.raises(jsonschema.ValidationError, match="does not match"):
        jsonschema.validate(bad_env, schema)


def test_v14_schema_validates_cidr_format():
    """v1.14 (REQ-145): vpc_cidr must match CIDR format."""
    schema = json.loads(SCHEMA.read_text())
    bad_env = {
        "name": "dev", "account_id": "123456789012", "region": "us-east-1",
        "state_backend": {"bucket": "test", "lock_table": "test"},
        "network": {"vpc_cidr": "not-a-cidr", "azs": ["us-east-1a"]},
        "runner_role_arn": "arn:aws:iam::123456789012:role/test",
        "autonomy": "full", "confidence_threshold": 0.5
    }
    with pytest.raises(jsonschema.ValidationError, match="does not match"):
        jsonschema.validate(bad_env, schema)