"""Human-readable values used by the operational control panel."""

from __future__ import annotations

from datetime import datetime, timezone
import os
from zoneinfo import ZoneInfo

from .config import settings


def _as_utc(value: datetime | None) -> datetime | None:
    if value is None:
        return None
    if value.tzinfo is None:
        value = value.replace(tzinfo=timezone.utc)
    return value.astimezone(timezone.utc)


def _ui_timezone() -> ZoneInfo:
    return ZoneInfo(os.getenv("UI_TIMEZONE", settings.ui_timezone))


def format_ui_datetime(value: datetime | None) -> str:
    """Format a stored timestamp in the configured UI timezone."""
    value = _as_utc(value)
    if value is None:
        return "-"
    return value.astimezone(_ui_timezone()).strftime("%d/%m/%Y %H:%M")


def format_age(value: datetime | None, now: datetime | None = None) -> str:
    value = _as_utc(value)
    if value is None:
        return "-"
    now = _as_utc(now or datetime.now(timezone.utc))
    seconds = int((now - value).total_seconds())
    if seconds <= 0:
        return "agora"
    minutes = seconds // 60
    if minutes < 1:
        return "agora"
    if minutes < 60:
        return f"há {minutes} min"
    return f"há {minutes // 60} h"


def format_duration(started_at: datetime | None, finished_at: datetime | None, now: datetime | None = None) -> str:
    del now
    started_at = _as_utc(started_at)
    if started_at is None:
        return "-"
    if finished_at is None:
        return "em andamento"
    elapsed = max(0, int((_as_utc(finished_at) - started_at).total_seconds()))
    hours, remainder = divmod(elapsed, 3600)
    minutes, seconds = divmod(remainder, 60)
    parts = []
    if hours:
        parts.append(f"{hours} h")
    if minutes:
        parts.append(f"{minutes} min")
    if seconds or not parts:
        parts.append(f"{seconds} s")
    return " ".join(parts)


def _blocker_value(blocker, name: str) -> str:
    if isinstance(blocker, dict):
        return str(blocker.get(name) or "").upper()
    return str(getattr(blocker, name, "") or "").upper()


def operational_priority(blocker) -> str:
    blocker_type = _blocker_value(blocker, "blocker_type")
    field = _blocker_value(blocker, "field")
    reason = _blocker_value(blocker, "reason_code")
    operational_text = f"{blocker_type} {reason}"
    if blocker_type in {"TECHNICAL_FAILURE", "CONNECTION_ERROR", "AGENT_OFFLINE", "JOB_FAILED"} or any(token in operational_text for token in ("TECHNICAL", "CONNECTION", "TIMEOUT")):
        return "CRITICAL"
    if blocker_type in {"BLOCKED_MISSING_EVIDENCE", "MISSING_EVIDENCE"}:
        return "HIGH"
    if field in {"CFOP", "ST", "ICMS", "CSOSN", "NCM"} or reason in {"INSUFFICIENT_EVIDENCE", "NO_EVIDENCE"}:
        return "NORMAL"
    return "LOW"


_HEALTH_LABELS = {
    "ONLINE": "Online",
    "DEGRADED": "Degradado",
    "OFFLINE": "Offline",
    "FAILED": "Falha",
    "UNKNOWN": "Desconhecido",
}


def health_label(value) -> str:
    if value is None or value == "":
        return "-"
    text = str(value)
    return _HEALTH_LABELS.get(text.upper(), text)


def _human_label(value, labels):
    if not value:
        return "Não informado"
    text = str(value).upper()
    return labels.get(text, str(value).replace("_", " ").lower().capitalize())


def fiscal_status_label(value):
    return _human_label(value, {"BLOCKED": "Bloqueado", "COMPLETE": "Completo", "INCOMPLETE": "Incompleto", "UNKNOWN": "Não informado"})


def job_status_label(value):
    return _human_label(value, {"PENDING": "Pendente", "RUNNING": "Executando", "COMPLETED": "Concluído", "FAILED": "Falhou"})


def job_kind_label(value):
    return _human_label(value, {"SYNC_INCREMENTAL": "Sincronização incremental", "INITIAL_SYNC": "Sincronização inicial", "REPROCESS_ALL": "Reprocessar tudo", "REPROCESS_PRODUCTS": "Reprocessar produtos"})


_RTC_LABELS = {
    "CCLASSTRIB_MISSING": "cClassTrib ausente", "CCLASSTRIB_INVALID": "cClassTrib inválido", "CCLASSTRIB_NOT_IN_CATALOG": "cClassTrib fora do catálogo local",
    "RTC_CST_INVALID": "CST IBS/CBS inválido", "PIS_CST_MISSING": "CST PIS ausente", "PIS_CST_INVALID": "CST PIS inválido", "PIS_RATE_INVALID": "Alíquota PIS inválida",
    "COFINS_CST_MISSING": "CST COFINS ausente", "COFINS_CST_INVALID": "CST COFINS inválido", "COFINS_RATE_INVALID": "Alíquota COFINS inválida",
    "PIS_COFINS_FLAG_INCONSISTENT": "Flag PIS/COFINS inconsistente",
}


def blocker_type_label(value):
    return _human_label(value, {"BLOCKED_MISSING_EVIDENCE": "Evidência fiscal ausente", "MISSING_EVIDENCE": "Evidência fiscal ausente", "TECHNICAL_FAILURE": "Falha técnica", "CONNECTION_ERROR": "Erro de conexão", "OTHER": "Outro", **_RTC_LABELS})


_REASON_LABELS = {
    "INVALID_NCM": "NCM inválido", "LEGACY_NCM": "NCM legado", "LEGACY_NCM_NO_AUTOMATIC_SUCCESSOR": "NCM legado sem sucessor automático",
    "LEGACY_NCM_REVIEW": "NCM legado em revisão", "LEGACY_NCM_REVIEW_REQUIRED": "NCM legado exige revisão", "LEGACY_OR_INVALID_NCM": "NCM legado ou inválido",
    "INSUFFICIENT_EVIDENCE": "Evidência insuficiente", "MISSING_EVIDENCE": "Evidência fiscal ausente", "BLOCKED_MISSING_EVIDENCE": "Evidência fiscal ausente",
    "MISSING_CONTEXT": "Contexto fiscal ausente", "NO_EVIDENCE": "Sem evidência", "MISSING_PRODUCT_ORIGIN": "Origem do produto ausente",
    "MISSING_PROFILE": "Perfil fiscal ausente", "MISSING_ST_DETERMINATION": "Determinação de ST ausente", "NO_IPI_DECISION": "Sem decisão de IPI",
    "NO_NUMERIC_VALUE": "Sem valor numérico", "CHANGE_REQUIRED": "Alteração necessária", "SAME_VALUE": "Valor já correto", "AMBIGUOUS": "Ambíguo",
}


def blocker_reason_label(value):
    return _human_label(value, _REASON_LABELS)


def health_reason_label(value):
    """Operator wording for the technical health reason strings produced by compute_agent_health."""
    text = str(value or "")
    if text.startswith("last heartbeat exceeds"):
        return "Sem heartbeat recente"
    return {"no heartbeat received": "Nenhum heartbeat recebido", "persistent technical failure": "Falha técnica persistente",
            "recent technical or job failure": "Falha técnica ou de job recente",
            "recent heartbeat without critical technical failure": "Operando normalmente"}.get(text, text or "Não informado")


def priority_label(value):
    return _human_label(value, {"CRITICAL": "Crítica", "HIGH": "Alta", "NORMAL": "Média", "MEDIUM": "Média", "LOW": "Baixa"})


def expanded_scope_view(summary):
    """Panel-ready view of the Agent's `expanded_scope` job summary (legacy and expanded coverage side by side). None when absent/unavailable."""
    if not isinstance(summary, dict) or "expanded_scope" not in summary:
        return None
    legacy, expanded, total = summary.get("legacy_scope") or {}, summary["expanded_scope"] or {}, summary.get("total_products") or 0
    percent = lambda part: round(100 * part / total, 1) if total else None
    return {"total": total, "legacy": legacy, "expanded": expanded, "legacy_percent": percent(legacy.get("complete", 0)), "expanded_percent": percent(expanded.get("complete", 0)),
            "blockers": [{"type": key, "label": blocker_type_label(key), "count": count} for key, count in (summary.get("blockers_by_type") or {}).items()],
            "capabilities": summary.get("capabilities") or {}, "local_catalog_only": bool(summary.get("local_catalog_only"))}