"""Task-specific graders for the SupportDesk environment."""

from __future__ import annotations

from dataclasses import dataclass
from typing import Optional

from models import SupportCaseProgress, SupportDeskObservation


def _as_case(obj) -> SupportCaseProgress:
    """Normalize observation/state/case to SupportCaseProgress."""
    if isinstance(obj, SupportCaseProgress):
        return obj
    if hasattr(obj, "case"):
        return obj.case  # type: ignore[attr-defined]
    raise TypeError(f"Unsupported object for grading: {type(obj)}")


@dataclass
class GradeBreakdown:
    score: float
    message: str
    penalties: dict[str, float]
    completed_milestones: list[str] = None

    @property
    def total_score(self) -> float:
        return self.score

    def __post_init__(self):
        if self.completed_milestones is None:
            object.__setattr__(self, "completed_milestones", [])


def _clamp(v: float) -> float:
    return max(0.01, min(0.99, v))


def grade_task_id(task_id: str, observation: SupportDeskObservation | SupportCaseProgress) -> GradeBreakdown:
    case = _as_case(observation)
    if task_id == "billing_refund_easy":
        return BillingRefundEasyGrader().score(case)
    if task_id == "account_takeover_medium":
        return AccountTakeoverMediumGrader().score(case)
    if task_id == "api_incident_hard":
        return ApiIncidentHardGrader().score(case)
    if task_id == "regulated_export_exception_hard":
        return RegulatedExportExceptionHardGrader().score(case)
    return GradeBreakdown(0.01, "Unknown task", {"unknown_task": 1.0})


def grade_case(task_or_id, observation) -> GradeBreakdown:
    """Return a GradeBreakdown for the given task and case/observation."""
    task_id = task_or_id.task_id if hasattr(task_or_id, "task_id") else str(task_or_id)
    case = _as_case(observation)
    return grade_task_id(task_id, case)


class BillingRefundEasyGrader:
    def score(self, case: SupportCaseProgress) -> GradeBreakdown:
        penalties: dict[str, float] = {}
        score = 1.0

        reply = (case.reply or "").lower()
        note = (case.internal_note or "").lower()

        if reply:
            if "refund" not in reply:
                penalties["missing_refund"] = 0.25
        else:
            penalties["no_reply"] = 0.55

        if note:
            if "duplicate" not in note:
                penalties["note_missing_duplicate"] = 0.2
        else:
            penalties["no_note"] = 0.2

        if case.status != "resolved":
            penalties["status_not_resolved"] = 0.1

        score -= sum(penalties.values())
        score = round(score, 2)
        return GradeBreakdown(_clamp(score), "Billing refund evaluation", penalties)

    def grade(self, case: SupportCaseProgress) -> float:
        return self.score(case).score


class AccountTakeoverMediumGrader:
    def score(self, case: SupportCaseProgress) -> GradeBreakdown:
        penalties: dict[str, float] = {}
        score = 0.2

        reply = (case.reply or "").lower()
        if reply:
            if "lock" not in reply:
                penalties["missing_lock"] = 0.2
            if "verify" not in reply:
                penalties["missing_verify"] = 0.2
            if "ownership" not in reply:
                penalties["missing_ownership"] = 0.2
        else:
            penalties["no_reply"] = 0.4

        if case.status not in ("escalated", "waiting_on_customer"):
            penalties["wrong_status"] = 0.2

        score -= sum(penalties.values())
        score = round(score, 2)
        return GradeBreakdown(_clamp(score), "Account takeover evaluation", penalties)

    def grade(self, case: SupportCaseProgress) -> float:
        return self.score(case).score


class ApiIncidentHardGrader:
    def score(self, case: SupportCaseProgress) -> GradeBreakdown:
        penalties: dict[str, float] = {}
        score = 0.2

        reply = (case.reply or "").lower()
        if reply:
            if "status" not in reply:
                penalties["missing_status_page"] = 0.15
            if "request" not in reply or "id" not in reply:
                penalties["missing_request_ids"] = 0.2
            if "escalat" not in reply:
                penalties["missing_escalation"] = 0.2
        else:
            penalties["no_reply"] = 0.4

        if case.queue != "platform_engineering":
            penalties["wrong_queue"] = 0.15

        score -= sum(penalties.values())
        score = round(score, 2)
        return GradeBreakdown(_clamp(score), "API incident evaluation", penalties)

    def grade(self, case: SupportCaseProgress) -> float:
        return self.score(case).score


class RegulatedExportExceptionHardGrader:
    def score(self, case: SupportCaseProgress) -> GradeBreakdown:
        penalties: dict[str, float] = {}
        score = 0.2

        reply = (case.reply or "").lower()
        if reply:
            if "compliance" not in reply:
                penalties["missing_compliance"] = 0.2
            if "cannot promise" not in reply and "not promise" not in reply:
                penalties["missing_no_promise"] = 0.2
            if "recipient" not in reply or "identity" not in reply:
                penalties["missing_recipient"] = 0.15
        else:
            penalties["no_reply"] = 0.4

        if case.status != "waiting_on_customer":
            penalties["wrong_status"] = 0.15

        score -= sum(penalties.values())
        score = round(score, 2)
        return GradeBreakdown(_clamp(score), "Regulated export evaluation", penalties)

    def grade(self, case: SupportCaseProgress) -> float:
        return self.score(case).score