from __future__ import annotations

import json
from typing import Any

SMETA_VALUE_PATHS: list[tuple[str, tuple[str, ...]]] = [
    ("section_code", ("section_code",)),
    ("name", ("name",)),
    ("plan_support_q1", ("plan", "support", "q1")),
    ("plan_support_q2", ("plan", "support", "q2")),
    ("plan_support_q3", ("plan", "support", "q3")),
    ("plan_support_q4", ("plan", "support", "q4")),
    ("plan_support_year", ("plan", "support", "year")),
    ("plan_development_q1", ("plan", "development", "q1")),
    ("plan_development_q2", ("plan", "development", "q2")),
    ("plan_development_q3", ("plan", "development", "q3")),
    ("plan_development_q4", ("plan", "development", "q4")),
    ("plan_development_year", ("plan", "development", "year")),
    ("plan_total_year", ("plan", "total_year")),
    ("approved_support_q1", ("approved", "support", "q1")),
    ("approved_support_q2", ("approved", "support", "q2")),
    ("approved_support_q3", ("approved", "support", "q3")),
    ("approved_support_q4", ("approved", "support", "q4")),
    ("approved_support_year", ("approved", "support", "year")),
    ("approved_development_q1", ("approved", "development", "q1")),
    ("approved_development_q2", ("approved", "development", "q2")),
    ("approved_development_q3", ("approved", "development", "q3")),
    ("approved_development_q4", ("approved", "development", "q4")),
    ("approved_development_year", ("approved", "development", "year")),
    ("approved_total_year", ("approved", "total_year")),
    ("fact_support_q1", ("fact", "support", "q1")),
    ("fact_support_q2", ("fact", "support", "q2")),
    ("fact_support_q3", ("fact", "support", "q3")),
    ("fact_support_q4", ("fact", "support", "q4")),
    ("fact_support_year", ("fact", "support", "year")),
    ("fact_development_q1", ("fact", "development", "q1")),
    ("fact_development_q2", ("fact", "development", "q2")),
    ("fact_development_q3", ("fact", "development", "q3")),
    ("fact_development_q4", ("fact", "development", "q4")),
    ("fact_development_year", ("fact", "development", "year")),
    ("fact_total_year", ("fact", "total_year")),
    ("corrected_support_q2", ("corrected", "support", "q2")),
    ("corrected_support_q3", ("corrected", "support", "q3")),
    ("corrected_support_q4", ("corrected", "support", "q4")),
    ("corrected_development_q2", ("corrected", "development", "q2")),
    ("corrected_development_q3", ("corrected", "development", "q3")),
    ("corrected_development_q4", ("corrected", "development", "q4")),
]
QUARTER_KEYS = ("q1", "q2", "q3", "q4", "totals")
FORM1_SECTION_BLOCK_KEYS = (
    "sequestration",
    "allocation",
    "reserve",
    "approved",
    "collegial",
    "ckk",
    "contract",
    "plan",
)
FORM1_METRIC_BLOCK_KEYS = (
    "plan",
    "reserve",
    "approved",
    "collegial",
    "allocation",
    "sequestration",
    "contract",
    "ckk",
    "contract_summary",
)


class ExcelValueSerializer:
    def to_excel_value(self, value: Any) -> Any:
        if value is None or isinstance(value, (str, int, float, bool)):
            return value
        if isinstance(value, dict):
            for preferred_key in ("name", "title", "label", "value"):
                preferred_value = value.get(preferred_key)
                if isinstance(preferred_value, (str, int, float, bool)) and preferred_value is not None:
                    return preferred_value
            if len(value) == 1:
                only_value = next(iter(value.values()))
                if isinstance(only_value, (str, int, float, bool)) or only_value is None:
                    return only_value
            return self._dict_to_readable_text(value)
        if isinstance(value, (list, tuple)):
            if all(isinstance(item, (str, int, float, bool)) or item is None for item in value):
                return ", ".join("" if item is None else str(item) for item in value)
            return json.dumps(value, ensure_ascii=False)
        return str(value)

    def _dict_to_readable_text(self, value: dict[str, Any]) -> Any:
        parts: list[str] = []
        for key, raw in value.items():
            normalized = self.to_excel_value(raw)
            if self._is_empty_excel_value(normalized):
                continue
            parts.append(f"{key}={normalized}")
        if not parts:
            return None
        return "; ".join(parts)

    def dict_to_readable_text(self, value: dict[str, Any]) -> Any:
        return self._dict_to_readable_text(value)

    @staticmethod
    def _is_empty_excel_value(value: Any) -> bool:
        if value is None:
            return True
        if isinstance(value, str) and value.strip() == "":
            return True
        return False


class Form1RowNormalizer:
    def __init__(self, serializer: ExcelValueSerializer):
        self.serializer = serializer

    def normalize(self, data: dict[str, Any]) -> dict[str, Any]:
        normalized = dict(data)
        self._merge_header_fields_into_row(normalized=normalized, original=data)
        self._promote_quarter_values_from_section_blocks(normalized=normalized)
        self._collapse_metric_blocks_to_scalar(normalized=normalized)
        self._fill_contract_fields(normalized=normalized)
        return normalized

    def _merge_header_fields_into_row(self, normalized: dict[str, Any], original: dict[str, Any]) -> None:
        header = original.get("header")
        if isinstance(header, dict):
            if "section" in header and "section" not in normalized:
                normalized["section"] = header.get("section")
            if "item_id" in header and "item_id" not in normalized:
                normalized["item_id"] = header.get("item_id")
            if "name" in header and "name" not in normalized:
                normalized["name"] = header.get("name")
        normalized.pop("header", None)
        normalized.pop("line_id", None)

    def _promote_quarter_values_from_section_blocks(self, normalized: dict[str, Any]) -> None:
        for section_key in FORM1_SECTION_BLOCK_KEYS:
            section_payload = normalized.get(section_key)
            if not isinstance(section_payload, dict):
                continue
            for quarter_key in QUARTER_KEYS:
                if normalized.get(quarter_key) is None and section_payload.get(quarter_key) is not None:
                    normalized[quarter_key] = section_payload.get(quarter_key)

    def _collapse_metric_blocks_to_scalar(self, normalized: dict[str, Any]) -> None:
        for block_key in FORM1_METRIC_BLOCK_KEYS:
            block_value = normalized.get(block_key)
            if isinstance(block_value, dict):
                normalized[block_key] = self._extract_preferred_metric(block_value)

    def _fill_contract_fields(self, normalized: dict[str, Any]) -> None:
        contract_summary = normalized.get("contract_summary")
        contract_detail = normalized.get("contract_detail")
        if normalized.get("contract") is None:
            normalized["contract"] = self._extract_contract_label(contract_detail, contract_summary)
        if isinstance(contract_detail, dict):
            normalized["contract_sum"] = self._extract_preferred_metric(contract_detail)

    def _extract_preferred_metric(self, payload: dict[str, Any]) -> Any:
        priority_keys = (
            "total_year",
            "year",
            "totals",
            "total",
            "sum",
            "amount",
            "value",
            "approved_amount",
            "reserved_amount",
            "allocated_amount",
            "booked_amount",
        )
        for key in priority_keys:
            if payload.get(key) is not None:
                return payload.get(key)
        for quarter_key in ("q1", "q2", "q3", "q4"):
            if payload.get(quarter_key) is not None:
                return payload.get(quarter_key)
        return self.serializer.dict_to_readable_text(payload)

    @staticmethod
    def _extract_contract_label(contract_detail: Any, contract_summary: Any) -> Any:
        for payload in (contract_detail, contract_summary):
            if not isinstance(payload, dict):
                continue
            for key in ("reference", "contract_ref", "counterparty", "subject"):
                value = payload.get(key)
                if value not in (None, ""):
                    return value
        return None


class SmetaRowNormalizer:
    def normalize(self, data: dict[str, Any]) -> dict[str, Any]:
        return {
            field: self._pick_nested_value(data, *path)
            for field, path in SMETA_VALUE_PATHS
        }

    @staticmethod
    def _pick_nested_value(container: Any, *path: str) -> Any:
        cur = container
        for key in path:
            if not isinstance(cur, dict):
                return None
            cur = cur.get(key)
        return cur


class Form3ReportRowNormalizer:
    def normalize(self, data: dict[str, Any]) -> dict[str, Any]:
        normalized = dict(data)
        header = data.get("header")
        if isinstance(header, dict):
            if "section_code" in header and "section" not in normalized:
                normalized["section"] = header.get("section_code")
            if "item_id" in header and "item_id" not in normalized:
                normalized["item_id"] = header.get("item_id")
            if "name" in header and "name" not in normalized:
                normalized["name"] = header.get("name")
        for quarter_key in ("q1", "q2", "q3", "q4"):
            normalized[quarter_key] = self._extract_quarter_metric(normalized.get(quarter_key))
        normalized["totals"] = self._extract_totals_metric(normalized.get("totals"))
        normalized.pop("header", None)
        normalized.pop("line_id", None)
        return normalized

    @staticmethod
    def _extract_quarter_metric(value: Any) -> Any:
        if not isinstance(value, dict):
            return value
        for key in ("quarter_actual", "total_corr", "economy"):
            if value.get(key) is not None:
                return value.get(key)
        return None

    @staticmethod
    def _extract_totals_metric(value: Any) -> Any:
        if not isinstance(value, dict):
            return value
        for key in ("total_actual", "total_corr", "economy"):
            if value.get(key) is not None:
                return value.get(key)
        return None