"""L1: Workflow.schema_linking_phase() — the phase that produces schema_linking.json.

Used by the CLI drift fix (the old SCHEMA_LINKING_PHASE constant is gone; commands
now ask the Workflow for it). Returns the num of the phase whose artifacts_out
contains schema_linking.json, defaulting to 5 if no phase declares it.
"""
from tht.workflow import PhaseSpec, Workflow


def _wf(phases: list[PhaseSpec]) -> Workflow:
    return Workflow(schema_version=1, phases=phases, _decision_min_map={})


def test_schema_linking_phase_returns_num_of_phase_with_artifact():
    # the real workflow: F4 schema_linking produces schema_linking.json
    from tht.workflow import load_workflow

    wf = load_workflow()
    assert wf.schema_linking_phase() == 4


def test_schema_linking_phase_finds_it_wherever_it_is():
    # synthetic: schema_linking.json declared on phase 3
    phases = [
        PhaseSpec(id="F1", num=1, name="a", advance="kind:phase", prerequisites=[]),
        PhaseSpec(id="F2", num=2, name="b", advance="kind:phase", prerequisites=[]),
        PhaseSpec(
            id="F3", num=3, name="c", advance="kind:phase",
            prerequisites=[], artifacts_out=["schema_linking.json"],
        ),
    ]
    assert _wf(phases).schema_linking_phase() == 3


def test_schema_linking_phase_defaults_to_5_when_no_artifact_declared():
    # defensive: if no phase declares schema_linking.json, fall back to 5 (the
    # conventional schema-linking phase) rather than raising.
    phases = [
        PhaseSpec(id="F1", num=1, name="a", advance="kind:phase", prerequisites=[]),
        PhaseSpec(id="F2", num=2, name="b", advance="kind:phase", prerequisites=[]),
    ]
    assert _wf(phases).schema_linking_phase() == 5


def test_schema_linking_phase_with_multiple_artifacts_finds_the_right_one():
    # a phase can produce multiple artifacts; schema_linking.json among them
    phases = [
        PhaseSpec(
            id="F5", num=5, name="sintesi", advance="kind:phase",
            prerequisites=[], artifacts_out=["cte_plan.json", "schema_linking.json"],
        ),
    ]
    assert _wf(phases).schema_linking_phase() == 5