"""Testes do indexador: manifesto incremental, reprocessamento e falhas parciais."""

from __future__ import annotations

import json
import sys
from pathlib import Path

import pytest

sys.path.insert(0, str(Path(__file__).resolve().parents[1]))

from app.bible_parser import BibleParser  # noqa: E402
from app.embedding import HashEmbedder  # noqa: E402
from app.extraction import PageText  # noqa: E402
from app.indexer import Indexer, IndexStatus  # noqa: E402
from app.vector_store import InMemoryVectorStore  # noqa: E402


class FakeExtractor:
    """Extrator controlado: devolve as páginas pré-definidas por arquivo."""

    def __init__(self, pages_by_file: dict[str, list[PageText]]):
        self.pages_by_file = pages_by_file
        self.calls: list[str] = []

    def extract_document(self, path: Path, file_hash: str | None = None):
        self.calls.append(Path(path).name)
        yield from self.pages_by_file.get(Path(path).name, [])


GENESIS_PAGE = (
    "GÊNESIS\n"
    "[1]\n"
    "1 No princípio criou Deus os céus e a terra.\n"
    "2 A terra era sem forma e vazia.\n"
)


@pytest.fixture
def settings(tmp_path):
    from app.config import Settings

    return Settings(
        pdf_dir=tmp_path / "pdfs",
        vector_db_dir=tmp_path / "vector_db",
        embedding_model="hash-test",
    )


def build_indexer(settings, extractor, embedder=None, store=None):
    embedder = embedder or HashEmbedder(dimensions=32)
    store = store or InMemoryVectorStore(embedder=embedder)
    indexer = Indexer(
        settings=settings,
        extractor=extractor,
        parser=BibleParser(),
        embedder=embedder,
        store=store,
    )
    return indexer, store


def write_pdf(directory: Path, name: str, content: bytes = b"%PDF-1.3") -> Path:
    directory.mkdir(parents=True, exist_ok=True)
    path = directory / name
    path.write_bytes(content)
    return path


def test_reindex_indexes_pdfs_and_reports_counts(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, store = build_indexer(settings, extractor)

    status = indexer.reindex()

    assert status.state == "ready"
    assert status.pdfs_total == 1
    assert status.pdfs_indexed == 1
    assert status.chunks == 2
    assert store.count() == 2


def test_reindex_is_incremental_when_hash_is_unchanged(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, _ = build_indexer(settings, extractor)

    indexer.reindex()
    indexer.reindex()

    assert extractor.calls == ["biblia.pdf"], "o PDF não deveria ser reprocessado"


def test_reindex_reprocesses_file_when_content_changes(settings):
    pdf_path = write_pdf(settings.pdf_dir, "biblia.pdf", b"%PDF-1.3 original")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, _ = build_indexer(settings, extractor)

    indexer.reindex()
    pdf_path.write_bytes(b"%PDF-1.3 modified content")
    indexer.reindex()

    assert extractor.calls == ["biblia.pdf", "biblia.pdf"]


def test_reindex_with_force_reprocesses_everything(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, _ = build_indexer(settings, extractor)

    indexer.reindex()
    indexer.reindex(force=True)

    assert extractor.calls == ["biblia.pdf", "biblia.pdf"]


def test_manifest_is_persisted(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, _ = build_indexer(settings, extractor)

    indexer.reindex()

    manifest = json.loads(settings.manifest_path.read_text(encoding="utf-8"))
    assert "biblia.pdf" in manifest
    assert manifest["biblia.pdf"]["state"] == "complete"
    assert manifest["biblia.pdf"]["chunks"] == 2
    assert manifest["biblia.pdf"]["sha256"]


def test_partial_file_is_recorded_as_partial(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor(
        {
            "biblia.pdf": [
                PageText(page=6, text=GENESIS_PAGE),
                PageText(page=7, text="", failed=True),
            ]
        }
    )
    indexer, store = build_indexer(settings, extractor)

    status = indexer.reindex()

    manifest = json.loads(settings.manifest_path.read_text(encoding="utf-8"))
    assert manifest["biblia.pdf"]["state"] == "partial"
    assert manifest["biblia.pdf"]["failed_pages"] == [7]
    assert status.errors


def test_failed_file_is_recorded_as_error(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text="", failed=True)]})
    indexer, store = build_indexer(settings, extractor)

    indexer.reindex()

    manifest = json.loads(settings.manifest_path.read_text(encoding="utf-8"))
    assert manifest["biblia.pdf"]["state"] == "error"
    assert store.count() == 0


def test_reindex_replaces_old_chunks_of_the_same_file(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, store = build_indexer(settings, extractor)

    indexer.reindex()
    indexer.reindex(force=True)

    assert store.count() == 2, "não deve haver duplicação após reindexação"


def test_status_reports_chunks_from_the_store(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, store = build_indexer(settings, extractor)

    indexer.reindex()
    status = indexer.status()

    assert isinstance(status, IndexStatus)
    assert status.chunks == store.count()


def test_empty_pdf_directory_is_ready_with_zero_chunks(settings):
    settings.pdf_dir.mkdir(parents=True, exist_ok=True)
    extractor = FakeExtractor({})
    indexer, _ = build_indexer(settings, extractor)

    status = indexer.reindex()

    assert status.state == "ready"
    assert status.pdfs_total == 0
    assert status.chunks == 0


def test_non_pdf_files_are_ignored(settings):
    settings.pdf_dir.mkdir(parents=True, exist_ok=True)
    (settings.pdf_dir / "notas.txt").write_text("ignorado", encoding="utf-8")
    extractor = FakeExtractor({})
    indexer, _ = build_indexer(settings, extractor)

    status = indexer.reindex()

    assert status.pdfs_total == 0
    assert extractor.calls == []


def test_status_reports_indexing_while_work_is_in_progress(settings):
    """Durante a indexação o status deve mostrar progresso, não zero."""
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, _ = build_indexer(settings, extractor)

    indexer.mark_indexing()
    status = indexer.status()

    assert status.state == "indexing"
    assert status.pdfs_total == 1


def test_status_counts_pages_processed_during_indexing(settings):
    write_pdf(settings.pdf_dir, "biblia.pdf")
    extractor = FakeExtractor({"biblia.pdf": [PageText(page=6, text=GENESIS_PAGE)]})
    indexer, _ = build_indexer(settings, extractor)

    indexer.mark_indexing()
    indexer.report_progress(pdf_name="biblia.pdf", pages_done=120, pages_total=3364)

    status = indexer.status()

    assert status.pages_processed == 120
    assert status.pages_total == 3364