"""
memory_ci.py — Memory Continuous Integration pipeline.

Candidate memories go through a strict promotion pipeline:

    candidate → immune_scan → quarantine → replay_test → promote/reject

No memory reaches the agent's prompt without passing every gate.
"""
from __future__ import annotations

import logging
from typing import Any

from purpose_agent.memory import MemoryCard, MemoryKind, MemoryStatus, MemoryStore
from purpose_agent.immune import scan_memory, ScanResult

logger = logging.getLogger(__name__)


class MemoryCI:
    """
    Continuous integration pipeline for agent memories.

    Usage:
        ci = MemoryCI(memory_store)

        # Submit a candidate memory
        card = MemoryCard(kind=MemoryKind.SKILL_CARD, pattern="...", strategy="...")
        result = ci.submit(card)

        # result.status is now QUARANTINED (passed scan) or REJECTED (failed scan)

        # After replay testing confirms it helps:
        ci.promote(card.id)

        # Or if replay shows it hurts:
        ci.reject(card.id, reason="decreased success rate in replay test")
    """

    def __init__(self, store: MemoryStore):
        self.store = store
        self._scan_log: list[dict[str, Any]] = []

    def submit(self, card: MemoryCard) -> MemoryCard:
        """
        Submit a candidate memory for the CI pipeline.

        Steps:
        1. Add to store as CANDIDATE
        2. Run immune scan
        3. If scan passes → QUARANTINED (awaiting replay test)
        4. If scan fails → REJECTED (with reason)
        """
        card.status = MemoryStatus.CANDIDATE
        self.store.add(card)

        # Immune scan
        scan_result = scan_memory(card)
        card.immune_scan_result = {
            "passed": scan_result.passed,
            "threats": scan_result.threats,
            "severity": scan_result.severity,
        }

        self._scan_log.append({
            "card_id": card.id,
            "kind": card.kind.value,
            "scan_passed": scan_result.passed,
            "threats": scan_result.threats,
        })

        if scan_result.passed:
            self.store.update_status(card.id, MemoryStatus.QUARANTINED)
            logger.info(f"MemoryCI: {card.id} → QUARANTINED (scan passed)")
        else:
            reason = f"Immune scan failed: {', '.join(scan_result.threats)} (severity={scan_result.severity})"
            self.store.update_status(card.id, MemoryStatus.REJECTED, reason=reason)
            logger.warning(f"MemoryCI: {card.id} → REJECTED ({reason})")

        return card

    def promote(self, card_id: str) -> bool:
        """
        Promote a quarantined memory to active use.
        Only quarantined memories can be promoted.
        """
        card = self.store.get(card_id)
        if not card:
            logger.warning(f"MemoryCI: card {card_id} not found")
            return False

        if card.status != MemoryStatus.QUARANTINED:
            logger.warning(
                f"MemoryCI: cannot promote {card_id} — "
                f"status is {card.status.value}, expected quarantined"
            )
            return False

        self.store.update_status(card_id, MemoryStatus.PROMOTED)
        logger.info(f"MemoryCI: {card_id} → PROMOTED")
        return True

    def reject(self, card_id: str, reason: str = "") -> bool:
        """Reject a memory (from any non-promoted status)."""
        card = self.store.get(card_id)
        if not card:
            return False

        if card.status == MemoryStatus.PROMOTED:
            # Demote: promoted → archived (don't delete, keep for audit)
            self.store.update_status(card_id, MemoryStatus.ARCHIVED, reason=reason)
            logger.info(f"MemoryCI: {card_id} DEMOTED → ARCHIVED ({reason})")
        else:
            self.store.update_status(card_id, MemoryStatus.REJECTED, reason=reason)
            logger.info(f"MemoryCI: {card_id} → REJECTED ({reason})")
        return True

    def archive(self, card_id: str) -> bool:
        """Archive a promoted memory (soft delete — keeps for audit trail)."""
        card = self.store.get(card_id)
        if not card:
            return False
        self.store.update_status(card_id, MemoryStatus.ARCHIVED)
        return True

    def get_quarantined(self) -> list[MemoryCard]:
        """Get all memories awaiting replay testing."""
        return self.store.get_by_status(MemoryStatus.QUARANTINED)

    def get_rejected(self) -> list[MemoryCard]:
        """Get all rejected memories (for audit)."""
        return self.store.get_by_status(MemoryStatus.REJECTED)

    @property
    def scan_log(self) -> list[dict]:
        return self._scan_log