"""
Unit tests for SessionMemory in src/agent/memory.py.

No external dependencies — pure in-memory dict operations.
Run: pytest tests/agent/test_memory.py
"""

from src.agent.memory import SessionMemory


# ---------------------------------------------------------------------------
# set / get
# ---------------------------------------------------------------------------

def test_set_and_get_string():
    m = SessionMemory()
    m.set("domain", "ecommerce")
    assert m.get("domain") == "ecommerce"


def test_get_missing_key_returns_none():
    m = SessionMemory()
    assert m.get("missing") is None


def test_get_missing_key_with_default():
    m = SessionMemory()
    assert m.get("missing", "fallback") == "fallback"


def test_overwrite_existing_key():
    m = SessionMemory()
    m.set("domain", "ecommerce")
    m.set("domain", "telecom")
    assert m.get("domain") == "telecom"


# ---------------------------------------------------------------------------
# all() / delete()
# ---------------------------------------------------------------------------

def test_all_returns_all_pairs():
    m = SessionMemory()
    m.set("domain", "banking")
    m.set("provider", "HDFC Bank")
    result = m.all()
    assert result == {"domain": "banking", "provider": "HDFC Bank"}


def test_all_returns_shallow_copy():
    m = SessionMemory()
    m.set("key", "val")
    copy = m.all()
    copy["key"] = "mutated"
    assert m.get("key") == "val"


def test_delete_removes_key():
    m = SessionMemory()
    m.set("domain", "insurance")
    m.delete("domain")
    assert m.get("domain") is None


def test_delete_absent_key_is_noop():
    m = SessionMemory()
    m.delete("nonexistent")  # must not raise


# ---------------------------------------------------------------------------
# Non-string value types
# ---------------------------------------------------------------------------

def test_store_list_value():
    m = SessionMemory()
    m.set("entities", ["ORG", "AMOUNT"])
    assert m.get("entities") == ["ORG", "AMOUNT"]


def test_store_dict_value():
    m = SessionMemory()
    m.set("context", {"domain": "telecom", "prior_contact": True})
    assert m.get("context") == {"domain": "telecom", "prior_contact": True}


def test_store_int_value():
    m = SessionMemory()
    m.set("count", 42)
    assert m.get("count") == 42