from __future__ import annotations

import json
import unittest

from ecospecies_api.document_format import (
    DocumentNode,
    StructuredDocument,
    build_document_from_species_payload,
    extract_citation_entries,
    extract_species_projection,
    export_markdown_document,
    parse_markdown_document,
    validate_markdown_document,
)


class StructuredMarkdownTests(unittest.TestCase):
    def test_round_trip_markdown_preserves_metadata_and_hierarchy(self) -> None:
        source = """---
title: American Oyster
common_name: American Oyster
scientific_name: Crassostrea virginica
legacy_identifiers:
  - authority: legacy-ecospecies
    identifier: 5192
    label: FLELMR
taxon_identifiers:
  - authority: worms
    identifier: 159059
    label: AphiaID
    primary: true
primary_taxon_authority: worms
---

## Summary
Short abstract.

## Habitat

### Type
Estuarine.
"""

        document = parse_markdown_document(source)

        self.assertEqual(document.metadata["title"], "American Oyster")
        self.assertEqual(document.metadata["primary_taxon_authority"], "worms")
        self.assertEqual(document.metadata["legacy_identifiers"][0]["identifier"], "5192")
        self.assertEqual(document.metadata["taxon_identifiers"][0]["authority"], "worms")
        self.assertEqual(document.nodes[0].title, "Summary")
        self.assertEqual(document.nodes[1].children[0].title, "Type")
        self.assertIn("## Habitat", export_markdown_document(document))

    def test_build_document_from_species_payload_creates_markdown_sections(self) -> None:
        document = build_document_from_species_payload(
            {
                "title": "American Oyster",
                "common_name": "American Oyster",
                "scientific_name": "Crassostrea virginica",
                "flelmr_code": "5192",
                "source_file": "American Oyster.txt",
                "summary": "Short abstract.",
                "sections": [
                    {"heading": "HEADER", "content": "Ignored header"},
                    {"heading": "Habitat", "content": "Estuarine."},
                    {"heading": "Reproduction", "content": "Broadcast spawner."},
                ],
            }
        )

        self.assertEqual(document.metadata["legacy_identifiers"][0]["identifier"], "5192")
        self.assertEqual(document.metadata["legacy_identifiers"][0]["authority"], "legacy-ecospecies")
        self.assertEqual([node.title for node in document.nodes], ["Summary", "Habitat", "Reproduction"])
        self.assertEqual(document.nodes[1].body, "Estuarine.")

    def test_extract_species_projection_flattens_nested_headings(self) -> None:
        document = parse_markdown_document(
            """---
title: American Oyster
common_name: American Oyster
scientific_name: Crassostrea virginica
legacy_identifiers:
  - authority: legacy-ecospecies
    identifier: 5192
    label: FLELMR
---

## Summary
Short abstract.

## Habitat
General habitat.

### Type
Estuarine.
"""
        )

        projection = extract_species_projection(document)

        self.assertEqual(projection["summary"], "Short abstract.")
        self.assertEqual(projection["flelmr_code"], "5192")
        self.assertEqual(
            [section["heading"] for section in projection["sections"]],
            ["Habitat", "Habitat / Type"],
        )

    def test_extract_species_projection_accepts_legacy_species_code_front_matter(self) -> None:
        document = parse_markdown_document(
            """---
title: Legacy Fish
common_name: Legacy Fish
scientific_name: Pisces historicus
species_code: 4242
---

## Habitat
Estuarine.
"""
        )

        projection = extract_species_projection(document)

        self.assertEqual(projection["flelmr_code"], "4242")

    def test_validate_markdown_document_rejects_missing_front_matter_and_depth_jump(self) -> None:
        errors = validate_markdown_document(
            """## Habitat
Text

#### Type
Nested too deeply.
"""
        )

        self.assertTrue(any("front matter" in error for error in errors))
        self.assertTrue(any("Heading depth jumps" in error for error in errors))

    def test_extract_citation_entries_strips_legacy_comma_number_prefix(self) -> None:
        document = parse_markdown_document(
            """---
title: Alabama Shad
common_name: Alabama Shad
scientific_name: Alosa alabamae
---

## References
160, Daniell, W.C. 1872. Letters referring to experiments of W.C. Daniell, M.D., in introducing shad into the Alabama River. Comm. Rept. U.S. Comm. Fish & Fish. 2: 387-390.
"""
        )

        citations = extract_citation_entries(document)

        self.assertEqual(len(citations), 1)
        self.assertEqual(citations[0]["legacy_reference_number"], "160")
        self.assertTrue(citations[0]["raw_text"].startswith("Daniell, W.C. 1872."))
        self.assertFalse(citations[0]["raw_text"].startswith("160,"))

    def test_extract_citation_entries_accepts_colon_terminated_citation_heading(self) -> None:
        citations = extract_citation_entries(
            StructuredDocument(
                metadata={},
                nodes=[
                    DocumentNode(
                        node_type="section",
                        title="Citations:",
                        body="7, Ahmed, M. 1975. Speciation in living oysters.",
                        depth=2,
                    )
                ],
            )
        )

        self.assertEqual(len(citations), 1)
        self.assertEqual(citations[0]["legacy_reference_number"], "7")

    def test_extract_citation_entries_accepts_bare_number_prefix(self) -> None:
        document = parse_markdown_document(
            """---
title: Eastern Mosquitofish
common_name: Eastern Mosquitofish
scientific_name: Gambusia holbrooki
---

## Citations
848 Gilmore, R.G. 1977. Fishes of the Indian River Lagoon and adjacent waters, Florida.
"""
        )

        citations = extract_citation_entries(document)

        self.assertEqual(len(citations), 1)
        self.assertEqual(citations[0]["legacy_reference_number"], "848")
        self.assertTrue(citations[0]["raw_text"].startswith("Gilmore, R.G. 1977."))