"""Retry and Recovery Optimizer: Maps failure tags to specific recovery actions."""
from typing import Dict, List, Optional
from dataclasses import dataclass

@dataclass
class RecoveryAction:
    action: str  # "retry_same","retry_changed_prompt","repair_tool","retrieve_more",
                 # "switch_model","ask_clarification","call_verifier","mark_blocked","terminate"
    reasoning: str
    new_tier: Optional[int] = None
    additional_context: Optional[str] = None

FAILURE_RECOVERY_MAP = {
    "tool_error": {"primary": "repair_tool", "fallback": "retry_changed_prompt"},
    "tool_not_found": {"primary": "retry_changed_prompt", "fallback": "ask_clarification"},
    "timeout": {"primary": "retry_same", "fallback": "switch_model"},
    "context_too_large": {"primary": "retrieve_more", "fallback": "switch_model"},
    "model_refused": {"primary": "retry_changed_prompt", "fallback": "switch_model"},
    "hallucination": {"primary": "call_verifier", "fallback": "retrieve_more"},
    "wrong_answer": {"primary": "switch_model", "fallback": "call_verifier"},
    "incomplete": {"primary": "retrieve_more", "fallback": "retry_changed_prompt"},
    "format_error": {"primary": "retry_changed_prompt", "fallback": "switch_model"},
    "permission_denied": {"primary": "ask_clarification", "fallback": "mark_blocked"},
    "rate_limit": {"primary": "retry_same", "fallback": "switch_model"},
    "unknown": {"primary": "retry_changed_prompt", "fallback": "ask_clarification"},
}

ESCALATION_TIERS = {
    "switch_model": 1,  # upgrade by 1 tier
    "call_verifier": 0,
    "mark_blocked": 0,
}

class RetryOptimizer:
    def __init__(self, max_retries: int = 3, max_total_retries: int = 5):
        self.max_retries = max_retries
        self.max_total_retries = max_total_retries
        self.retry_counts: Dict[str, int] = {}
        self.total_retries = 0
        self.recovery_stats = {}

    def get_recovery(self, failure_tag: str, current_tier: int,
                     retry_num: int, previous_actions: List[str] = None,
                     run_cost_so_far: float = 0, max_run_cost: float = 5.0) -> RecoveryAction:
        self.retry_counts[failure_tag] = self.retry_counts.get(failure_tag, 0) + 1
        self.total_retries += 1
        # Check if we should terminate
        if self.total_retries >= self.max_total_retries:
            return RecoveryAction("terminate", "max total retries reached")
        if retry_num >= self.max_retries:
            return RecoveryAction("mark_blocked", f"max retries ({self.max_retries}) for this failure")
        if run_cost_so_far >= max_run_cost * 0.8:
            return RecoveryAction("terminate", "approaching cost limit")
        # Get recovery action
        recovery = FAILURE_RECOVERY_MAP.get(failure_tag, FAILURE_RECOVERY_MAP["unknown"])
        action_name = recovery["primary"]
        # Check if primary was already tried
        if previous_actions and action_name in previous_actions:
            action_name = recovery["fallback"]
        # Build action
        new_tier = None
        if action_name == "switch_model":
            new_tier = min(current_tier + ESCALATION_TIERS["switch_model"], 5)
        self.recovery_stats[action_name] = self.recovery_stats.get(action_name, 0) + 1
        return RecoveryAction(
            action=action_name,
            reasoning=f"failure={failure_tag}, retry={retry_num}, action={action_name}",
            new_tier=new_tier,
        )

    def reset_run(self):
        self.retry_counts = {}
        self.total_retries = 0