import json
from datetime import UTC, date, datetime
from pathlib import Path

import pytest
from pydantic import ValidationError

from gewu.domain.contracts import (
    AutoAcceptPolicy,
    Confidence,
    Locator,
    NodeType,
    ProjectRecord,
    ProjectStatus,
    ProposalReceipt,
    ProposalState,
    ReliabilityGrade,
    Scope,
    SearchRequest,
    SourceRevisionRecord,
)


def test_project_contract_rejects_unknown_fields() -> None:
    with pytest.raises(ValidationError):
        ProjectRecord.model_validate(
            {
                "project_id": "dome",
                "title": "Dome",
                "status": ProjectStatus.ACTIVE,
                "north_star": "Understand interactive environments",
                "key_questions": ("What works?",),
                "autonomy_policy_id": "pilot",
                "untrusted_extra": "ignored?",
            }
        )


def test_project_status_supports_pause_without_losing_registry_record() -> None:
    project = ProjectRecord(
        project_id="dome",
        title="Dome",
        status=ProjectStatus.PAUSED,
        north_star="Understand interactive environments",
        key_questions=("What works?",),
        autonomy_policy_id="pilot",
    )
    assert (
        ProjectRecord.model_validate_json(project.model_dump_json()).status == ProjectStatus.PAUSED
    )


@pytest.mark.parametrize("project_id", ["Dome", "two_words", "project.slug"])
def test_project_ids_must_be_lowercase_slugs(project_id: str) -> None:
    with pytest.raises(ValidationError):
        ProjectRecord(
            project_id=project_id,
            title="Invalid project ID",
            status=ProjectStatus.ACTIVE,
            north_star="A stable project lens.",
            key_questions=("What matters?",),
            autonomy_policy_id="policy",
        )


def test_scope_requires_explicit_all_projects_flag() -> None:
    with pytest.raises(ValidationError):
        Scope(projects=("all",))
    assert Scope(projects=("all",), all_projects=True)


@pytest.mark.parametrize("unsafe_id", ["../private", "bad/id", " leading-space"])
def test_scope_rejects_unsafe_project_ids(unsafe_id: str) -> None:
    with pytest.raises(ValidationError):
        Scope(projects=(unsafe_id,))


def test_search_facets_are_typed_and_reject_duplicate_node_types() -> None:
    request = SearchRequest(
        query="audience",
        scope=Scope(projects=("dome-performance",)),
        node_types=(NodeType.PROBLEM, NodeType.TECHNIQUE),
        tags=("attendance", "real-time"),
        audience=("product",),
        use_for=("comparison",),
        domain=("production",),
        confidences=(Confidence.MEDIUM,),
        as_of_from=date(2024, 1, 1),
        as_of_to=date(2024, 12, 31),
        stale_only=True,
        budget_tokens=1000,
    )
    assert request.stale_only
    assert request.tags == ("attendance", "real-time")
    assert request.domain == ("production",)
    assert request.confidences == (Confidence.MEDIUM,)
    assert request.as_of_from == date(2024, 1, 1)
    with pytest.raises(ValidationError, match="must not be later"):
        SearchRequest(
            query="audience",
            scope=Scope(projects=("dome-performance",)),
            as_of_from=date(2025, 1, 1),
            as_of_to=date(2024, 12, 31),
            budget_tokens=1000,
        )
    with pytest.raises(ValidationError, match="confidences must be unique"):
        SearchRequest(
            query="audience",
            scope=Scope(projects=("dome-performance",)),
            confidences=(Confidence.MEDIUM, Confidence.MEDIUM),
            budget_tokens=1000,
        )
    with pytest.raises(ValidationError):
        SearchRequest(
            query="audience",
            scope=Scope(projects=("dome-performance",)),
            node_types=(NodeType.PROBLEM, NodeType.PROBLEM),
            budget_tokens=1000,
        )
    with pytest.raises(ValidationError):
        SearchRequest(
            query="audience",
            scope=Scope(projects=("dome-performance",)),
            tags=("attendance", "attendance"),
            budget_tokens=1000,
        )
    with pytest.raises(ValidationError):
        SearchRequest(
            query="audience",
            scope=Scope(projects=("dome-performance",)),
            domain=(" production",),
            budget_tokens=1000,
        )


def test_search_allows_empty_query_only_for_a_typed_browse() -> None:
    request = SearchRequest(
        scope=Scope(projects=("dome-performance",)),
        node_types=(NodeType.PROBLEM,),
        budget_tokens=1000,
    )
    assert request.query == ""
    with pytest.raises(ValidationError, match="search requires text"):
        SearchRequest(
            scope=Scope(projects=("dome-performance",)),
            budget_tokens=1000,
        )
    with pytest.raises(ValidationError, match="search requires text"):
        SearchRequest(
            query="  ",
            scope=Scope(projects=("dome-performance",)),
            budget_tokens=1000,
        )


def test_pdf_locator_uses_one_based_page_and_nonempty_span() -> None:
    with pytest.raises(ValidationError):
        Locator(kind="pdf_page_span", block_id="p1-b1", start=8, end=8, page=0)


def test_unarchived_source_requires_a_url_and_cannot_claim_artifact_bytes() -> None:
    base = {
        "source_id": "project:bookmark",
        "revision_id": "project:bookmark:r1",
        "media_type": "application/octet-stream",
        "byte_length": 0,
        "captured_at": datetime.now(UTC),
        "original_url": "https://example.org/paper",
        "title": "Referenced paper",
        "license": "unspecified",
        "source_type": "paper",
        "reliability_grade": ReliabilityGrade.MEDIUM,
        "ingested_for": ("dome-performance",),
        "archive_status": "reference-only",
    }
    record = SourceRevisionRecord.model_validate(base)
    assert record.artifact_sha256 is None
    with pytest.raises(ValidationError):
        SourceRevisionRecord.model_validate({**base, "byte_length": 10})
    with pytest.raises(ValidationError):
        SourceRevisionRecord.model_validate({**base, "original_url": None})


def test_receipt_is_immutable_and_versioned() -> None:
    receipt = ProposalReceipt(
        proposal_id="proposal-1",
        revision=1,
        payload_digest="a" * 64,
        state=ProposalState.ACCEPTED,
        outcome="accepted",
        commit_id="b" * 64,
        decided_at=datetime.now(UTC),
    )
    assert receipt.schema_version == 1
    with pytest.raises(ValidationError):
        receipt.revision = 2  # type: ignore[misc]


def test_pilot_registry_fixture_matches_project_and_policy_contracts() -> None:
    fixture_path = (
        Path(__file__).resolve().parents[2] / "schema" / "fixtures" / "pilot-projects.json"
    )

    def reject_duplicate_keys(pairs: list[tuple[str, object]]) -> dict[str, object]:
        result: dict[str, object] = {}
        for key, value in pairs:
            if key in result:
                raise ValueError(f"duplicate JSON key: {key}")
            result[key] = value
        return result

    fixture = json.loads(
        fixture_path.read_text(encoding="utf-8"), object_pairs_hook=reject_duplicate_keys
    )
    projects = tuple(
        ProjectRecord.model_validate_json(json.dumps(record), strict=True)
        for record in fixture["projects"]
    )
    policies = tuple(
        AutoAcceptPolicy.model_validate_json(json.dumps(record), strict=True)
        for record in fixture["test_policies"]
    )
    assert {project.project_id for project in projects} == {
        "dome-performance",
        "interactive-video",
    }
    assert {policy.project_id for policy in policies} == {
        "dome-performance",
        "interactive-video",
        "shared",
    }