from __future__ import annotations

from typing import Any

from review_agent.application_form_fill.constants import (
    TEMPLATE_CHANGE_REGISTRATION,
    TEMPLATE_ESSENTIAL_PRINCIPLES,
    TEMPLATE_REGISTRATION_CERTIFICATE,
)
from review_agent.application_form_fill.schemas import TemplateSpec
from review_agent.models import ApplicationFormFillBatch


ALL_TEMPLATE_CODES = [
    TEMPLATE_REGISTRATION_CERTIFICATE,
    TEMPLATE_CHANGE_REGISTRATION,
    TEMPLATE_ESSENTIAL_PRINCIPLES,
]


def parse_requested_templates(message: str) -> list[str]:
    normalized = (message or "").lower()
    if any(keyword in normalized for keyword in ["全部模板", "所有模板", "全套模板", "全部表格", "所有表格"]):
        return ALL_TEMPLATE_CODES.copy()

    requested: list[str] = []
    if "注册证" in normalized and "变更注册" not in normalized and "变更 注册" not in normalized:
        requested.append(TEMPLATE_REGISTRATION_CERTIFICATE)
    if any(keyword in normalized for keyword in ["变更注册", "变更 注册", "变更备案", "备案文件"]):
        requested.append(TEMPLATE_CHANGE_REGISTRATION)
    if any(keyword in normalized for keyword in ["安全和性能基本原则", "基本原则清单", "原则清单"]):
        requested.append(TEMPLATE_ESSENTIAL_PRINCIPLES)
    return _dedupe(requested)


def detect_registration_type(
    *,
    batch: ApplicationFormFillBatch | None = None,
    message: str = "",
    file_candidates: dict[str, Any] | None = None,
) -> tuple[str, str]:
    user_value = _registration_type_from_text(message)
    if user_value:
        return user_value, ApplicationFormFillBatch.RegistrationTypeSource.USER_MESSAGE

    regulatory_value = _registration_type_from_regulatory_batch(batch)
    if regulatory_value:
        return regulatory_value, ApplicationFormFillBatch.RegistrationTypeSource.REGULATORY_BATCH

    file_value = _registration_type_from_candidates(file_candidates or {})
    if file_value:
        return file_value, ApplicationFormFillBatch.RegistrationTypeSource.FILE_EXTRACT

    return "unknown", ApplicationFormFillBatch.RegistrationTypeSource.UNKNOWN


def select_templates(
    config: dict[str, Any],
    requested_templates: list[str],
    registration_type: str,
) -> tuple[list[TemplateSpec], list[dict[str, str]]]:
    template_map = {item.get("code"): item for item in config.get("templates") or []}
    risk_notes: list[dict[str, str]] = []
    if requested_templates:
        selected_codes = _dedupe(requested_templates)
    elif registration_type in {"变更注册", "备案"}:
        selected_codes = [TEMPLATE_CHANGE_REGISTRATION, TEMPLATE_ESSENTIAL_PRINCIPLES]
    else:
        selected_codes = [TEMPLATE_REGISTRATION_CERTIFICATE, TEMPLATE_ESSENTIAL_PRINCIPLES]

    specs: list[TemplateSpec] = []
    for code in selected_codes:
        raw = template_map.get(code)
        if not raw:
            risk_notes.append({"type": "unknown_template", "message": f"模板不存在：{code}"})
            continue
        spec = _to_template_spec(raw)
        if requested_templates and not _template_applies(spec, registration_type):
            risk_notes.append(
                {
                    "type": "template_registration_mismatch",
                    "message": f"用户指定模板 {spec.name} 与注册类型 {registration_type or 'unknown'} 可能不匹配，仍按指定生成。",
                }
            )
        specs.append(spec)
    return specs, risk_notes


def _to_template_spec(raw: dict[str, Any]) -> TemplateSpec:
    return TemplateSpec(
        code=str(raw.get("code") or ""),
        name=str(raw.get("name") or ""),
        source_file=str(raw.get("source_file") or ""),
        output_label=str(raw.get("output_label") or raw.get("name") or ""),
        applies_when=dict(raw.get("applies_when") or {}),
        file_format=str(raw.get("file_format") or ""),
        fields=list(raw.get("fields") or []),
        checklist_items=list(raw.get("checklist_items") or []),
    )


def _template_applies(spec: TemplateSpec, registration_type: str) -> bool:
    allowed = spec.applies_when.get("registration_type") or []
    if not allowed:
        return True
    return registration_type in allowed or (registration_type == "unknown" and "unknown" in allowed)


def _registration_type_from_text(message: str) -> str:
    normalized = (message or "").lower()
    if any(keyword in normalized for keyword in ["首次注册", "初次注册", "新注册"]):
        return "首次注册"
    if "变更注册" in normalized:
        return "变更注册"
    if "备案" in normalized:
        return "备案"
    return ""


def _registration_type_from_regulatory_batch(batch: ApplicationFormFillBatch | None) -> str:
    if not batch or not batch.source_regulatory_batch_id:
        return ""
    condition_json = batch.source_regulatory_batch.condition_json or {}
    confirmed = condition_json.get("confirmed_conditions") or {}
    candidates = condition_json.get("candidates") or {}
    for payload in [confirmed, condition_json, candidates.get("registration_type") or {}]:
        if isinstance(payload, dict):
            value = payload.get("registration_type") or payload.get("suggested") or payload.get("value")
            normalized = _normalize_registration_type(value)
            if normalized:
                return normalized
    return ""


def _registration_type_from_candidates(candidates: dict[str, Any]) -> str:
    value = candidates.get("registration_type") or candidates.get("suggested")
    if isinstance(value, dict):
        value = value.get("value") or value.get("suggested")
    return _normalize_registration_type(value)


def _normalize_registration_type(value: Any) -> str:
    text = str(value or "")
    if "首次" in text or "初次" in text:
        return "首次注册"
    if "变更" in text:
        return "变更注册"
    if "备案" in text:
        return "备案"
    return ""


def _dedupe(values: list[str]) -> list[str]:
    result: list[str] = []
    for value in values:
        if value and value not in result:
            result.append(value)
    return result