from __future__ import annotations

from .crm_mixin import CrmMixin
from .crm_schema_helpers import _field_path
from .crm_shared import (
    CUSTOMER_STATUS_LABELS,
    FOLLOWUP_STATUS_LABELS,
    FOLLOWUP_TYPE_LABELS,
    MAX_PAGE_SIZE,
    MAX_SCAN_RECORDS,
    Any,
    Mapping,
    NbCommandError,
    _decorate_dimension_counts,
    _dimension_value,
    _first_numeric,
    build_and_filter,
    build_date_range_condition,
    build_relation_id_condition,
)


class CrmAnalyticsMixin(CrmMixin):
    def crm_overview(
        self,
        date_from: str | None = None,
        date_to: str | None = None,
        owner: str | None = None,
    ) -> dict[str, Any]:
        owner_id, owner_error = self._resolve_owner_id_or_error(owner)
        if owner_error:
            return {"error": owner_error}
        customer_filter = build_and_filter([build_relation_id_condition(self.config.customer.owner_field, owner_id)])
        followup_filter = build_and_filter(
            [
                build_relation_id_condition(self.config.followup.owner_field, owner_id),
                build_date_range_condition(self.config.followup.date_field, date_from, date_to),
            ]
        )
        totals = {
            "customers": self._count(self.config.customer.resource, self.config.customer.id_field, customer_filter),
            "contacts": self._count(self.config.contact.resource, self.config.contact.id_field, {}),
            "followups": self._count(self.config.followup.resource, self.config.followup.id_field, followup_filter),
        }
        overview: dict[str, Any] = {
            "totals": totals,
            "customer_status": self._group_count(
                self.config.customer.resource,
                self.config.customer.id_field,
                self.config.customer.status_field,
                customer_filter,
            ),
            "customer_source": self._group_count(
                self.config.customer.resource,
                self.config.customer.id_field,
                self.config.customer.source_field,
                customer_filter,
            ),
            "customer_owner": self._group_count(
                self.config.customer.resource,
                self.config.customer.id_field,
                [self.config.customer.owner_field, "id"],
                customer_filter,
            ),
            "recent_followups": self._compact_followups(
                self._data(
                    self.client.list_records(
                        self.config.followup.resource,
                        filter=followup_filter,
                        fields=self._followup_compact_fields(),
                        sort=self.config.followup.sort,
                        page=1,
                        page_size=10,
                    )
                )
            ),
        }
        overview["customer_status"] = self._decorate_status_counts(overview["customer_status"])
        overview["customer_source"] = self._decorate_source_counts(overview["customer_source"])
        overview["customer_owner"] = self._decorate_owner_counts(overview["customer_owner"])
        return overview

    def crm_filter_options(self, owner_query: str | None = None) -> dict[str, Any]:
        owner_candidates: list[dict[str, Any]] = []
        if (owner_query or "").strip():
            owner_candidates = self.resolve_owner(owner_query or "")["results"]
        return {
            "customer_status": self._decorate_status_counts(
                self._group_count(
                    self.config.customer.resource,
                    self.config.customer.id_field,
                    self.config.customer.status_field,
                    {},
                )
            ),
            "customer_source": self._decorate_source_counts(
                self._group_count(
                    self.config.customer.resource,
                    self.config.customer.id_field,
                    self.config.customer.source_field,
                    {},
                )
            ),
            # Follow-up rows render type and status as labels only, so the raw
            # codes the filters expect are published here instead.
            "followup_type": [{"value": value, "label": label} for value, label in FOLLOWUP_TYPE_LABELS.items()],
            "followup_record_status": [
                {"value": value, "label": label} for value, label in FOLLOWUP_STATUS_LABELS.items()
            ],
            "owner_candidates": owner_candidates,
            "max_limit": MAX_PAGE_SIZE,
        }

    def _count(self, resource: str, id_field: str, filter_value: Mapping[str, Any]) -> int:
        response = self.client.query_records(
            resource,
            measures=[{"field": [id_field], "aggregation": "count", "alias": "count"}],
            filter=filter_value,
            limit=1,
        )
        return _first_numeric(self._data(response), "count")

    def _group_count(
        self,
        resource: str,
        id_field: str,
        dimension_field: str | list[str],
        filter_value: Mapping[str, Any],
    ) -> list[dict[str, Any]]:
        if not dimension_field:
            return []
        dimension_path = _field_path(dimension_field)
        dimension_alias = "_".join(dimension_path)
        rows: list[dict[str, Any]] = []
        batch_size = MAX_PAGE_SIZE
        offset = 0
        while True:
            response = self.client.query_records(
                resource,
                dimensions=[{"field": dimension_path, "alias": dimension_alias}],
                measures=[{"field": [id_field], "aggregation": "count", "alias": "count"}],
                orders=[{"field": dimension_path, "alias": dimension_alias, "order": "asc"}],
                filter=filter_value,
                limit=batch_size,
                offset=offset,
            )
            batch = self._data(response)
            rows.extend(batch)
            if len(batch) < batch_size:
                break
            if len(rows) >= MAX_SCAN_RECORDS:
                raise NbCommandError(
                    f"Aggregation produced at least {MAX_SCAN_RECORDS} buckets; add filters to narrow the result"
                )
            offset += batch_size
        return rows

    def _decorate_status_counts(self, rows: list[dict[str, Any]]) -> list[dict[str, Any]]:
        return _decorate_dimension_counts(
            rows,
            preferred_keys=[self.config.customer.status_field, "kh_progress", "status"],
            labels=CUSTOMER_STATUS_LABELS,
        )

    def _decorate_source_counts(self, rows: list[dict[str, Any]]) -> list[dict[str, Any]]:
        return _decorate_dimension_counts(
            rows,
            preferred_keys=[self.config.customer.source_field, "f_225h6n6v654", "source"],
            labels={},
        )

    def _decorate_owner_counts(self, rows: list[dict[str, Any]]) -> list[dict[str, Any]]:
        owner_alias = "_".join(_field_path([self.config.customer.owner_field, "id"]))
        decorated: list[dict[str, Any]] = []
        for row in rows:
            value, key = _dimension_value(row, [owner_alias, "owner_id", "kehu_followup_person_id"])
            item = dict(row)
            if value is not None:
                if key is not None and key not in {"owner_id", "value"}:
                    item.pop(key, None)
                item["owner_id"] = value
            decorated.append(item)
        return decorated