import json

import pytest

from multi_swarm.protocol.grammar import (
    ACTION_VALUES,
    ALL_OPS,
    COMPARATOR_OPS,
    CROSSOVER_OPS,
    KIND_VALUES,
    LOGICAL_OPS,
)
from multi_swarm.protocol.parser import (
    FeatureNode,
    IndicatorNode,
    LiteralNode,
    OpNode,
    ParseError,
    parse_strategy,
)


def test_grammar_constant_sets() -> None:
    assert LOGICAL_OPS == {"and", "or", "not"}
    assert COMPARATOR_OPS == {"gt", "lt", "eq"}
    assert CROSSOVER_OPS == {"crossover", "crossunder"}
    assert KIND_VALUES == {"indicator", "feature", "literal"}
    assert ACTION_VALUES == {"entry-long", "entry-short", "exit", "flat"}
    assert ALL_OPS == LOGICAL_OPS | COMPARATOR_OPS | CROSSOVER_OPS


def test_parse_simple_strategy() -> None:
    src = json.dumps(
        {
            "rules": [
                {
                    "condition": {
                        "op": "gt",
                        "args": [
                            {"kind": "indicator", "name": "rsi", "params": [14]},
                            {"kind": "literal", "value": 70.0},
                        ],
                    },
                    "action": "entry-short",
                }
            ]
        }
    )
    ast = parse_strategy(src)
    assert len(ast.rules) == 1
    rule = ast.rules[0]
    assert rule.action == "entry-short"
    assert isinstance(rule.condition, OpNode)
    assert rule.condition.op == "gt"
    assert isinstance(rule.condition.args[0], IndicatorNode)
    assert rule.condition.args[0].name == "rsi"
    assert rule.condition.args[0].params == [14.0]
    assert isinstance(rule.condition.args[1], LiteralNode)
    assert rule.condition.args[1].value == 70.0


def test_parse_multiple_rules() -> None:
    src = json.dumps(
        {
            "rules": [
                {
                    "condition": {
                        "op": "gt",
                        "args": [
                            {"kind": "indicator", "name": "rsi", "params": [14]},
                            {"kind": "literal", "value": 70.0},
                        ],
                    },
                    "action": "entry-short",
                },
                {
                    "condition": {
                        "op": "lt",
                        "args": [
                            {"kind": "indicator", "name": "rsi", "params": [14]},
                            {"kind": "literal", "value": 30.0},
                        ],
                    },
                    "action": "entry-long",
                },
            ]
        }
    )
    ast = parse_strategy(src)
    assert len(ast.rules) == 2


def test_parse_feature_leaf() -> None:
    src = json.dumps(
        {
            "rules": [
                {
                    "condition": {
                        "op": "crossover",
                        "args": [
                            {"kind": "feature", "name": "close"},
                            {"kind": "indicator", "name": "sma", "params": [50]},
                        ],
                    },
                    "action": "entry-long",
                }
            ]
        }
    )
    ast = parse_strategy(src)
    cond = ast.rules[0].condition
    assert isinstance(cond, OpNode) and cond.op == "crossover"
    assert isinstance(cond.args[0], FeatureNode)
    assert cond.args[0].name == "close"


def test_parse_unknown_op_raises() -> None:
    src = json.dumps(
        {
            "rules": [
                {
                    "condition": {"op": "frobnicate", "args": [1, 2]},
                    "action": "entry-long",
                }
            ]
        }
    )
    with pytest.raises(ParseError, match="Unknown op"):
        parse_strategy(src)


def test_parse_invalid_action_raises() -> None:
    src = json.dumps(
        {
            "rules": [
                {
                    "condition": {"kind": "literal", "value": 1.0},
                    "action": "buy-now",
                }
            ]
        }
    )
    with pytest.raises(ParseError, match="action"):
        parse_strategy(src)


def test_parse_malformed_json_raises() -> None:
    with pytest.raises(ParseError, match="invalid JSON"):
        parse_strategy("{this is not json")


def test_parse_top_level_array_raises() -> None:
    with pytest.raises(ParseError, match="JSON object"):
        parse_strategy("[1, 2, 3]")


def test_parse_missing_rules_key_raises() -> None:
    with pytest.raises(ParseError, match="rules"):
        parse_strategy(json.dumps({"foo": "bar"}))


def test_parse_empty_rules_raises() -> None:
    with pytest.raises(ParseError, match="at least one"):
        parse_strategy(json.dumps({"rules": []}))


def test_parse_node_with_both_op_and_kind_raises() -> None:
    src = json.dumps(
        {
            "rules": [
                {
                    "condition": {"op": "gt", "kind": "indicator", "args": []},
                    "action": "flat",
                }
            ]
        }
    )
    with pytest.raises(ParseError, match="mutually exclusive"):
        parse_strategy(src)


def test_parse_indicator_with_nested_node_raises() -> None:
    src = json.dumps(
        {
            "rules": [
                {
                    "condition": {
                        "kind": "indicator",
                        "name": "sma",
                        "params": [{"kind": "literal", "value": 14}],
                    },
                    "action": "flat",
                }
            ]
        }
    )
    with pytest.raises(ParseError, match="params"):
        parse_strategy(src)