"""Intake endpoint — POST /api/intake. Creates client (+reuse by email) + debtor + claim.
Writes audit rows, SYSTEM note, emails the DRE team (best-effort).
"""
from __future__ import annotations

import logging

from fastapi import APIRouter, Request, status
from pydantic import ValidationError

from . import auth as authmod
from . import db
from . import dreemail
from .db import get_conn, new_uuid, next_sequence_number, utcnow_iso
from .models import IntakeRequest

logger = logging.getLogger("dre.intake")
router = APIRouter()


def _money_display(cents: int) -> str:
    return f"${cents / 100.0:,.2f}"


@router.post("/api/intake")
async def intake(request: Request):
    # Rate limit
    ip = authmod.get_client_ip(request)
    if not authmod.rate_limit_intake(ip):
        return _json_error("rate_limited", "Too many requests. Please try again later.",
                           status.HTTP_429_TOO_MANY_REQUESTS)
    # Parse JSON body
    try:
        body = await request.json()
    except Exception:
        return _json_error("validation_error", "Invalid JSON body.", status.HTTP_422_UNPROCESSABLE_ENTITY)
    # Validate
    try:
        req = IntakeRequest.model_validate(body)
    except ValidationError as exc:
        return _json_error("validation_error", _format_validation_error(exc),
                           status.HTTP_422_UNPROCESSABLE_ENTITY)

    client_in = req.client
    debtor_in = req.debtor
    claim_in = req.claim
    email_lc = client_in.email.lower()

    with get_conn() as conn:
        now = utcnow_iso()
        # Reuse client by email or create new
        existing = conn.execute("SELECT id, client_number FROM clients WHERE email = ?", (email_lc,)).fetchone()
        if existing is not None:
            client_id = existing["id"]
            client_number = existing["client_number"]
            conn.execute(
                "UPDATE clients SET company_name = ?, contact_name = ?, phone = ?, tos_accepted_at = COALESCE(tos_accepted_at, ?), updated_at = ? WHERE id = ?",
                (client_in.company_name, client_in.contact_name, client_in.phone, now, now, client_id),
            )
            # audit update
            conn.execute(
                "INSERT INTO audit_log (id, entity_type, entity_id, action, field, old_value, new_value, actor, reason, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
                (new_uuid(), "client", client_id, "update", "contact_info", None, None, "intake", "reused existing client", now),
            )
        else:
            client_id = new_uuid()
            client_number = next_sequence_number(conn, "CLT")
            conn.execute(
                "INSERT INTO clients (id, client_number, company_name, contact_name, email, phone, tos_accepted_at, twentycrm_id, created_at, updated_at) "
                "VALUES (?, ?, ?, ?, ?, ?, ?, NULL, ?, ?)",
                (client_id, client_number, client_in.company_name, client_in.contact_name,
                 email_lc, client_in.phone, now, now, now),
            )
            conn.execute(
                "INSERT INTO audit_log (id, entity_type, entity_id, action, actor, created_at) VALUES (?, ?, ?, ?, ?, ?)",
                (new_uuid(), "client", client_id, "create", "intake", now),
            )

        # Debtor (always new per spec — denormalized avoided, but new claim = new debtor row)
        debtor_id = new_uuid()
        conn.execute(
            "INSERT INTO debtors (id, name, business_type, contact_email, contact_phone, physical_address, twentycrm_id, created_at, updated_at) "
            "VALUES (?, ?, ?, ?, ?, ?, NULL, ?, ?)",
            (debtor_id, debtor_in.name, debtor_in.business_type, debtor_in.contact_email,
             debtor_in.contact_phone, debtor_in.physical_address, now, now),
        )
        conn.execute(
            "INSERT INTO audit_log (id, entity_type, entity_id, action, actor, created_at) VALUES (?, ?, ?, ?, ?, ?)",
            (new_uuid(), "debtor", debtor_id, "create", "intake", now),
        )

        # Claim
        claim_id = new_uuid()
        claim_number = next_sequence_number(conn, "DRE")
        conn.execute(
            "INSERT INTO claims (id, claim_number, client_id, debtor_id, amount_cents, currency, status, tier, description, client_reference, invoice_date, date_assigned, date_resolved, twentycrm_id, created_at, updated_at) "
            "VALUES (?, ?, ?, ?, ?, 'USD', 'NEW', 'TIER_1', ?, ?, ?, NULL, NULL, NULL, ?, ?)",
            (claim_id, claim_number, client_id, debtor_id, claim_in.amount_cents,
             claim_in.description, claim_in.client_reference, claim_in.invoice_date, now, now),
        )
        conn.execute(
            "INSERT INTO audit_log (id, entity_type, entity_id, action, old_value, new_value, actor, created_at) VALUES (?, ?, ?, ?, ?, ?, ?, ?)",
            (new_uuid(), "claim", claim_id, "create", None, claim_number, "intake", now),
        )

        # SYSTEM shared note
        note_id = new_uuid()
        conn.execute(
            "INSERT INTO case_notes (id, claim_id, author_type, author_name, subject, content, visibility, twentycrm_id, created_at) "
            "VALUES (?, ?, 'SYSTEM', 'System', NULL, 'Claim received.', 'SHARED', NULL, ?)",
            (note_id, claim_id, now),
        )
        conn.execute(
            "INSERT INTO audit_log (id, entity_type, entity_id, action, actor, created_at) VALUES (?, ?, ?, ?, ?, ?)",
            (new_uuid(), "note", note_id, "note_add", "system", now),
        )
        conn.commit()

    # Best-effort team notification
    try:
        dreemail.notify_team_intake(claim_number, client_number, client_in.company_name,
                                    claim_in.amount_cents, debtor_in.name)
    except Exception as exc:  # noqa: BLE001
        logger.error("intake team notify failed: %s", exc)

    return {
        "claim_number": claim_number,
        "client_number": client_number,
        "status": "NEW",
        "message": "Claim received. Our team will review and contact you shortly.",
    }


def _format_validation_error(exc: ValidationError) -> str:
    parts = []
    for err in exc.errors():
        loc = ".".join(str(x) for x in err["loc"])
        parts.append(f"{loc}: {err['msg']}")
    return "; ".join(parts)


def _json_error(code: str, message: str, status_code: int):
    from fastapi.responses import JSONResponse
    return JSONResponse(
        status_code=status_code,
        content={"error": {"code": code, "message": message}},
    )