"""Round-trip tests for the ``DifyBuilderContext`` JSON (de)serializer.

``DifyBuilderContext`` is the per-session working state persisted as the
``context`` JSONB column on ``dify_builder_session_commits`` (P3a Task 4).
This module verifies the pure (de)serializer is lossless and produces a
JSON-safe dict, independent of any database concern.
"""

import json

from core.dify_builder.models import (
    ChangeSet,
    ChecklistError,
    Diagnosis,
    DifyBuilderContext,
    MutationIntent,
    Risk,
)
from services.dify_builder.serde import context_from_dict, context_to_dict


def _full_fix_context() -> DifyBuilderContext:
    return DifyBuilderContext(
        failed_run_id="TR-1",
        diagnosis=Diagnosis(
            culprit_node_id="n1",
            root_cause="TypeError in code node",
            severity="high",
        ),
        staged_repair=[
            MutationIntent(
                op="set_node_config",
                args={"node_id": "n1", "path": "code", "value": "return {}"},
            )
        ],
        risk=Risk(level="low", reason="config-only change", has_external_side_effect=False),
        change_set=ChangeSet(changed_nodes=["n1"], diff="- old\n+ new"),
        checkpoint_id="cp-1",
        verify_run_id="TR-2",
        test_input_ref="ti-1",
        last_snapshot_hash="abc123",
        next_seq=3,
        source="checklist",
        checklist_errors=[
            ChecklistError(
                node_id="n2",
                node_type="code",
                title="Code",
                messages=["missing required field"],
                unconnected=False,
                plugin_missing=False,
            )
        ],
    )


def test_fully_populated_fix_context_round_trips():
    fc = _full_fix_context()

    result = context_from_dict(context_to_dict(fc))

    assert result == fc


def test_empty_fix_context_round_trips():
    fc = DifyBuilderContext()

    result = context_from_dict(context_to_dict(fc))

    assert result == fc


def test_to_dict_output_is_json_serializable():
    fc = _full_fix_context()

    d = context_to_dict(fc)

    # Must not raise -- this is what actually lands in the JSONB column.
    json.dumps(d)


def test_from_dict_tolerates_missing_optional_keys():
    # An older/partial persisted dict -- only a subset of keys present.
    d = {"failed_run_id": "TR-9"}

    fc = context_from_dict(d)

    assert fc == DifyBuilderContext(failed_run_id="TR-9")


def test_context_round_trips_build_fields():
    from core.dify_builder.models import DifyBuilderContext
    from services.dify_builder.serde import context_from_dict, context_to_dict

    fc = DifyBuilderContext(
        goal_text="Build a quarterly report workflow",
        requirements={"currency": "USD", "prefer_audited": True},
        plan_items=["Retrieve", "Summarize", "Emit"],
        plan_version_tag="v2",
        resource_selection={"resource_ids": ["kb-company"]},
        built_node_ids=["start", "llm", "end"],
    )
    out = context_from_dict(context_to_dict(fc))
    assert out == fc


def test_context_from_dict_defaults_build_fields_when_absent():
    from core.dify_builder.models import DifyBuilderContext
    from services.dify_builder.serde import context_from_dict

    fc = context_from_dict({"failed_run_id": "TR-9"})
    assert fc == DifyBuilderContext(failed_run_id="TR-9")
    assert fc.goal_text == ""
    assert fc.requirements == {}
    assert fc.plan_items == []


def test_context_roundtrip_preserves_edit_fields():
    from core.dify_builder.models import DifyBuilderContext
    from services.dify_builder.serde import context_from_dict, context_to_dict

    fc = DifyBuilderContext(
        edit_rules={"risk_threshold": "high", "preserve_summary": True},
        edit_target_node_ids=["llm", "knowledge_retrieval"],
    )
    out = context_from_dict(context_to_dict(fc))
    assert out.edit_rules == {"risk_threshold": "high", "preserve_summary": True}
    assert out.edit_target_node_ids == ["llm", "knowledge_retrieval"]


def test_context_from_dict_defaults_edit_fields_when_absent():
    from services.dify_builder.serde import context_from_dict

    out = context_from_dict({})  # an older row with no edit_* keys
    assert out.edit_rules == {}
    assert out.edit_target_node_ids == []


def test_context_roundtrip_preserves_lifecycle_fields():
    from core.dify_builder.models import DifyBuilderContext
    from services.dify_builder.serde import context_from_dict, context_to_dict

    fc = DifyBuilderContext(paused=True, checkpoint_seq=7)
    out = context_from_dict(context_to_dict(fc))
    assert out.paused is True
    assert out.checkpoint_seq == 7


def test_context_from_dict_defaults_lifecycle_fields_when_absent():
    from services.dify_builder.serde import context_from_dict

    out = context_from_dict({})  # an older row with no paused/checkpoint_seq keys
    assert out.paused is False
    assert out.checkpoint_seq == 0


def test_serde_round_trips_recovery_fields():
    from core.dify_builder.models import DifyBuilderContext
    from services.dify_builder.serde import context_from_dict, context_to_dict

    fc = DifyBuilderContext(last_structure_fingerprint="fp-abc", recovery_class="config_only")
    d = context_to_dict(fc)
    assert d["last_structure_fingerprint"] == "fp-abc"
    assert d["recovery_class"] == "config_only"
    back = context_from_dict(d)
    assert back.last_structure_fingerprint == "fp-abc"
    assert back.recovery_class == "config_only"


def test_serde_defaults_recovery_fields_for_old_rows():
    from services.dify_builder.serde import context_from_dict

    # An older persisted dict lacking the new keys still deserializes.
    back = context_from_dict({})
    assert back.last_structure_fingerprint == ""
    assert back.recovery_class == ""


def test_serde_round_trips_skill_learning_policy():
    from core.dify_builder.models import DifyBuilderContext
    from services.dify_builder.serde import context_from_dict, context_to_dict

    fc = DifyBuilderContext(skill_learning_policy="automatic")
    d = context_to_dict(fc)
    assert d["skill_learning_policy"] == "automatic"
    assert context_from_dict(d).skill_learning_policy == "automatic"


def test_serde_defaults_skill_learning_policy_for_old_rows():
    from services.dify_builder.serde import context_from_dict

    assert context_from_dict({}).skill_learning_policy == "ask"


def test_form_fields_round_trips():
    from core.dify_builder.models import DifyBuilderContext
    from services.dify_builder.serde import context_from_dict, context_to_dict

    fc = DifyBuilderContext()
    fc.form_fields = [{"key": "categories", "label": "Categories", "type": "text", "options": []}]
    restored = context_from_dict(context_to_dict(fc))
    assert restored.form_fields == fc.form_fields


def test_form_fields_defaults_empty_when_absent():
    from services.dify_builder.serde import context_from_dict

    assert context_from_dict({}).form_fields == []


def test_reply_language_round_trips():
    fc = DifyBuilderContext(reply_language="ja")
    result = context_from_dict(context_to_dict(fc))
    assert result.reply_language == "ja"


def test_reply_language_defaults_empty_when_absent():
    assert context_from_dict({}).reply_language == ""


def test_repair_loop_fields_round_trip():
    # Regression: context_from_dict previously never read these two keys,
    # so a session persisted mid-repair-loop silently reset its attempt
    # count to 0 on the very next turn, making the repeated-failure guard
    # in handlers_build.py structurally unreachable (BUILD_AWAIT_REPAIR is
    # a waiting state -- every approve_repair is a fresh turn that reloads
    # the context via context_from_dict).
    fc = DifyBuilderContext(repair_attempts=5, last_repair_error="boom")
    result = context_from_dict(context_to_dict(fc))
    assert result.repair_attempts == 5
    assert result.last_repair_error == "boom"


def test_repair_loop_fields_default_when_absent():
    out = context_from_dict({})  # an older row with no repair_attempts/last_repair_error keys
    assert out.repair_attempts == 0
    assert out.last_repair_error == ""


def test_unknown_outcome_count_round_trips_and_defaults_to_zero():
    from core.dify_builder.models import DifyBuilderContext
    from services.dify_builder.serde import context_from_dict, context_to_dict

    fc = DifyBuilderContext(unknown_outcome_count=2)
    assert context_from_dict(context_to_dict(fc)).unknown_outcome_count == 2
    # a context persisted before the field existed
    assert context_from_dict({}).unknown_outcome_count == 0