"""Finalises a BulkUpload into ``property`` rows (ADR-0013).

The domain logic of Finalise: turn the combiner output rows into property identity
rows (the same resolution the old Next.js ``/finalize`` route did) and persist them
through the injected writer. Like every orchestrator it never commits — the caller
owns the transaction boundary (see the Lambda handler).
"""

from __future__ import annotations

import re
from typing import Any, Optional

from uuid import UUID

from repositories.bulk_upload.bulk_upload_status_writer import BulkUploadStatusWriter
from repositories.property.property_repository import (
    PropertyIdentityInsert,
    PropertyRepository,
)

# Combiner-output columns — identical to the old frontend /finalize route and the
# backend combined-results reader (router.py).
ADDRESS_COLS = ("Address 1", "Address 2", "Address 3")
POSTCODE_COL = "postcode"
INTERNAL_REF_COL = "Internal Reference"
UPRN_COL = "address2uprn_uprn"
MATCHED_ADDRESS_COL = "address2uprn_address"
LEXISCORE_COL = "address2uprn_lexiscore"
MISSING_SENTINEL = "invalid postcode"
UK_POSTCODE_RE = re.compile(r"[A-Z]{1,2}\d[A-Z\d]?\s*\d[A-Z]{2}", re.IGNORECASE)


def _normalize(value: Any) -> str:
    if value is None:
        return ""
    return str(value).strip()


def _is_missing(value: str) -> bool:
    return value == "" or value.lower() == MISSING_SENTINEL


def _parse_uprn(raw: Any) -> Optional[int]:
    val = _normalize(raw)
    if _is_missing(val):
        return None
    try:
        return int(val)
    except ValueError:
        return None


def _parse_lexiscore(raw: Any) -> Optional[float]:
    val = _normalize(raw)
    if _is_missing(val):
        return None
    try:
        return float(val)
    except ValueError:
        return None


def _extract_postcode(matched: Optional[str], fallback: str) -> Optional[str]:
    if matched:
        m = UK_POSTCODE_RE.search(matched)
        if m:
            return m.group(0).upper()
    return fallback or None


class BulkUploadFinaliserOrchestrator:
    """Owns the domain flow of Finalise, depending only on repository ports.

    Both collaborators are ports (``PropertyRepository``,
    ``BulkUploadStatusWriter``); the concrete Postgres adapters are wired by the
    Lambda handler (the composition root). So a unit test constructs this with two
    fakes and exercises ``finalise`` end-to-end — no engine, session, or DB. The
    orchestrator never commits: the caller opens the transaction around
    ``finalise`` so the insert and the ``complete`` flip land atomically.
    """

    def __init__(
        self,
        property_repo: PropertyRepository,
        status_writer: BulkUploadStatusWriter,
    ) -> None:
        self._property_repo = property_repo
        self._status_writer = status_writer

    def finalise(
        self, rows: list[dict[str, str]], portfolio_id: int, task_id: UUID
    ) -> int:
        """Resolve the combiner rows, insert the properties, and mark the upload
        ``complete`` — all via the injected repositories, no DB connection of its
        own. Returns the number of properties inserted. Does not commit."""
        inserts = self.to_property_rows(rows, portfolio_id)
        inserted = self._property_repo.insert_all(inserts)
        self._status_writer.set_status(task_id, "complete")
        return inserted

    def to_property_rows(
        self, rows: list[dict[str, str]], portfolio_id: int
    ) -> list[PropertyIdentityInsert]:
        """Resolve combiner rows into property identity inserts.

        Pure (no DB / IO) and independently testable. Reproduces the old
        ``/finalize`` route's resolution exactly: matched address falls back to the
        user-inputted one; postcode is extracted from the matched address or falls
        back to the user-inputted postcode.
        """
        return [self._row_to_insert(raw, portfolio_id) for raw in rows]

    @staticmethod
    def _row_to_insert(
        raw: dict[str, str], portfolio_id: int
    ) -> PropertyIdentityInsert:
        user_inputted_address = (
            ", ".join(p for p in (_normalize(raw.get(c)) for c in ADDRESS_COLS) if p)
            or None
        )
        user_inputted_postcode = _normalize(raw.get(POSTCODE_COL)) or None

        uprn = _parse_uprn(raw.get(UPRN_COL))

        matched_address_raw = _normalize(raw.get(MATCHED_ADDRESS_COL))
        matched_address = (
            None if _is_missing(matched_address_raw) else matched_address_raw
        )

        address = matched_address or user_inputted_address
        postcode = _extract_postcode(matched_address, user_inputted_postcode or "")
        internal_ref = _normalize(raw.get(INTERNAL_REF_COL)) or None
        lexiscore = _parse_lexiscore(raw.get(LEXISCORE_COL))

        return PropertyIdentityInsert(
            portfolio_id=portfolio_id,
            uprn=uprn,
            landlord_property_id=internal_ref,
            address=address,
            postcode=postcode,
            user_inputted_address=user_inputted_address,
            user_inputted_postcode=user_inputted_postcode,
            lexiscore=lexiscore,
            creation_status="READY",
        )