"""Manifest parsing and fail-fast validation (ingest-spec §3, §4).

The manifest MUST be schema-validated fail-fast BEFORE any source call.
The verdict layer is reserved: no `okf_type: verdict` (case-insensitive),
and generated filenames stay disjoint from `index.md` / `promoted-verdict-*`.
"""

from __future__ import annotations

import json
from pathlib import Path
from typing import Any

import pytest

from llm_ingestion_okf.errors import IngestError, ManifestError
from llm_ingestion_okf.manifest import (
    Extraction,
    FileSource,
    HttpSource,
    Manifest,
    SqlSource,
    generated_filename,
    load_manifest,
)


def valid_file_manifest() -> dict[str, Any]:
    return {
        "manifest_version": 1,
        "source": {"type": "file", "id": "catalogue-1", "root": "data"},
        "bundle_summary": "A test bundle.",
        "extractions": [
            {
                "id": "orders",
                "title": "Orders",
                "query": "orders.csv",
                "okf_type": "dataset",
                "max_rows": 100,
            }
        ],
    }


def valid_sql_manifest() -> dict[str, Any]:
    manifest = valid_file_manifest()
    manifest["source"] = {"type": "sql", "id": "db-1", "connection_ref": "TEST_DB"}
    manifest["extractions"][0]["query"] = "SELECT a, b FROM t ORDER BY a"
    return manifest


def valid_http_manifest() -> dict[str, Any]:
    manifest = valid_file_manifest()
    manifest["source"] = {"type": "http", "id": "api-1", "base_url": "https://example.test"}
    manifest["extractions"][0]["query"] = "/orders"
    return manifest


def write_manifest(tmp_path: Path, data: dict[str, Any]) -> Path:
    path = tmp_path / "manifest.json"
    path.write_text(json.dumps(data), encoding="utf-8")
    return path


def load(tmp_path: Path, data: dict[str, Any]) -> Manifest:
    return load_manifest(write_manifest(tmp_path, data))


# --- error hierarchy ---


def test_manifest_error_is_ingest_error() -> None:
    assert issubclass(ManifestError, IngestError)
    assert issubclass(IngestError, Exception)


# --- valid manifests parse into typed objects ---


def test_valid_file_manifest_parses(tmp_path: Path) -> None:
    manifest = load(tmp_path, valid_file_manifest())
    assert manifest.manifest_version == 1
    assert isinstance(manifest.source, FileSource)
    assert manifest.source.id == "catalogue-1"
    assert manifest.source.root == "data"
    assert manifest.bundle_summary == "A test bundle."
    assert manifest.extractions == (
        Extraction(
            id="orders", title="Orders", query="orders.csv", okf_type="dataset", max_rows=100
        ),
    )


def test_valid_sql_manifest_parses(tmp_path: Path) -> None:
    manifest = load(tmp_path, valid_sql_manifest())
    assert isinstance(manifest.source, SqlSource)
    assert manifest.source.connection_ref == "TEST_DB"


def test_valid_http_manifest_parses(tmp_path: Path) -> None:
    manifest = load(tmp_path, valid_http_manifest())
    assert isinstance(manifest.source, HttpSource)
    assert manifest.source.base_url == "https://example.test"
    assert manifest.source.credential_ref is None


def test_http_manifest_with_credential_ref(tmp_path: Path) -> None:
    data = valid_http_manifest()
    data["source"]["credential_ref"] = "API_TOKEN"
    manifest = load(tmp_path, data)
    assert isinstance(manifest.source, HttpSource)
    assert manifest.source.credential_ref == "API_TOKEN"


# --- top-level schema ---


@pytest.mark.parametrize("missing", ["manifest_version", "source", "bundle_summary", "extractions"])
def test_missing_top_level_field_rejected(tmp_path: Path, missing: str) -> None:
    data = valid_file_manifest()
    del data[missing]
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize("version", [0, 2, "1", 1.0, True, None])
def test_unsupported_manifest_version_rejected(tmp_path: Path, version: Any) -> None:
    data = valid_file_manifest()
    data["manifest_version"] = version
    with pytest.raises(ManifestError):
        load(tmp_path, data)


def test_unknown_top_level_field_rejected(tmp_path: Path) -> None:
    data = valid_file_manifest()
    data["extra"] = "x"
    with pytest.raises(ManifestError):
        load(tmp_path, data)


def test_non_object_manifest_rejected(tmp_path: Path) -> None:
    path = tmp_path / "manifest.json"
    path.write_text(json.dumps([1, 2]), encoding="utf-8")
    with pytest.raises(ManifestError):
        load_manifest(path)


def test_invalid_json_rejected(tmp_path: Path) -> None:
    path = tmp_path / "manifest.json"
    path.write_text("{not json", encoding="utf-8")
    with pytest.raises(ManifestError):
        load_manifest(path)


@pytest.mark.parametrize("summary", [None, 7, ["x"]])
def test_non_string_bundle_summary_rejected(tmp_path: Path, summary: Any) -> None:
    data = valid_file_manifest()
    data["bundle_summary"] = summary
    with pytest.raises(ManifestError):
        load(tmp_path, data)


# --- source: polymorphic on type ---


@pytest.mark.parametrize("bad_type", ["ftp", "", None, 3])
def test_unknown_source_type_rejected(tmp_path: Path, bad_type: Any) -> None:
    data = valid_file_manifest()
    data["source"]["type"] = bad_type
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize(
    ("factory", "required"),
    [
        (valid_file_manifest, "root"),
        (valid_sql_manifest, "connection_ref"),
        (valid_http_manifest, "base_url"),
    ],
)
def test_missing_source_field_rejected(tmp_path: Path, factory: Any, required: str) -> None:
    data = factory()
    del data["source"][required]
    with pytest.raises(ManifestError):
        load(tmp_path, data)


def test_unknown_source_field_rejected(tmp_path: Path) -> None:
    data = valid_file_manifest()
    data["source"]["connection_ref"] = "X"  # sql field on a file source
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize("bad_id", ["", "-x", "Xy", "a_b", "a b", "æ", 7, None])
def test_bad_source_id_rejected(tmp_path: Path, bad_id: Any) -> None:
    data = valid_file_manifest()
    data["source"]["id"] = bad_id
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize(
    "url",
    [
        "https://user:pass@example.test",  # embedded credentials (spec §4: MUST NOT)
        "https://token@example.test",
    ],
)
def test_base_url_with_embedded_credentials_rejected(tmp_path: Path, url: str) -> None:
    data = valid_http_manifest()
    data["source"]["base_url"] = url
    with pytest.raises(ManifestError):
        load(tmp_path, data)


# --- extractions ---


def test_empty_extractions_rejected(tmp_path: Path) -> None:
    data = valid_file_manifest()
    data["extractions"] = []
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize("missing", ["id", "title", "query", "okf_type", "max_rows"])
def test_missing_extraction_field_rejected(tmp_path: Path, missing: str) -> None:
    data = valid_file_manifest()
    del data["extractions"][0][missing]
    with pytest.raises(ManifestError):
        load(tmp_path, data)


def test_unknown_extraction_field_rejected(tmp_path: Path) -> None:
    data = valid_file_manifest()
    data["extractions"][0]["max_row"] = 5  # typo for max_rows
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize("bad_id", ["", "-x", "Orders", "a_b", "a/b", "a.b", 7, None])
def test_bad_extraction_id_rejected(tmp_path: Path, bad_id: Any) -> None:
    data = valid_file_manifest()
    data["extractions"][0]["id"] = bad_id
    with pytest.raises(ManifestError):
        load(tmp_path, data)


def test_duplicate_extraction_ids_rejected(tmp_path: Path) -> None:
    data = valid_file_manifest()
    data["extractions"].append(dict(data["extractions"][0]))
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize(
    "bad_title",
    [
        "two\nlines",
        "carriage\rreturn",
        "",
        7,
        None,
        # `[`/`]` break index-link and navigation parsing (ingest spec §4/§6):
        # rejected fail-fast at manifest load so downstream verbatim rendering is safe.
        "opening [bracket",
        "closing ]bracket",
        "[wrapped]",
    ],
)
def test_bad_title_rejected(tmp_path: Path, bad_title: Any) -> None:
    data = valid_file_manifest()
    data["extractions"][0]["title"] = bad_title
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize("bad_rows", [0, -1, "100", 1.5, True, False, None])
def test_bad_max_rows_rejected(tmp_path: Path, bad_rows: Any) -> None:
    data = valid_file_manifest()
    data["extractions"][0]["max_rows"] = bad_rows
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize("bad_query", ["", 7, None])
def test_bad_query_rejected(tmp_path: Path, bad_query: Any) -> None:
    data = valid_file_manifest()
    data["extractions"][0]["query"] = bad_query
    with pytest.raises(ManifestError):
        load(tmp_path, data)


# --- verdict reservation (spec §3) — load-bearing seam ---


@pytest.mark.parametrize("verdict", ["verdict", "Verdict", "VERDICT", "vErDiCt"])
def test_verdict_okf_type_rejected(tmp_path: Path, verdict: str) -> None:
    """Load-bearing (spec §11): MUST fail if a verdict-typed mapping stops being rejected."""
    data = valid_file_manifest()
    data["extractions"][0]["okf_type"] = verdict
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize("bad_type", ["", 7, None])
def test_bad_okf_type_rejected(tmp_path: Path, bad_type: Any) -> None:
    data = valid_file_manifest()
    data["extractions"][0]["okf_type"] = bad_type
    with pytest.raises(ManifestError):
        load(tmp_path, data)


@pytest.mark.parametrize("extraction_id", ["index", "promoted-verdict-1", "orders"])
def test_generated_filenames_stay_outside_reserved_namespaces(extraction_id: str) -> None:
    """The ingest- prefix keeps generated names disjoint from index.md and
    promoted-verdict-* (spec §5) — even for adversarial extraction ids."""
    name = generated_filename(extraction_id)
    assert name == f"ingest-{extraction_id}.md"
    assert name != "index.md"
    assert not name.startswith("promoted-verdict-")


# --- fail-fast: validation error BEFORE any source call (spec §4) ---


def test_validation_fails_before_any_source_access(tmp_path: Path) -> None:
    """Load-bearing (spec §11): a malformed manifest never starts a run.

    The manifest points at a nonexistent source root AND carries a reserved
    okf_type. Validation must raise ManifestError — not any I/O error — and
    must not resolve or touch the source at all.
    """
    data = valid_file_manifest()
    data["source"]["root"] = str(tmp_path / "does-not-exist")
    data["extractions"][0]["okf_type"] = "verdict"
    with pytest.raises(ManifestError):
        load(tmp_path, data)


def test_validation_does_not_require_source_to_exist(tmp_path: Path) -> None:
    """Manifest validation is schema-only: source existence is a connector
    concern, checked at extraction time — never at validation time."""
    data = valid_file_manifest()
    data["source"]["root"] = str(tmp_path / "does-not-exist")
    manifest = load(tmp_path, data)
    assert isinstance(manifest.source, FileSource)