"""Super Big Brain orchestrator: tokenless, recursive, graph-backed reasoning."""

from __future__ import annotations

from dataclasses import dataclass
from typing import Any

from fusionagi._logger import logger
from fusionagi.memory.semantic_graph import SemanticGraphMemory
from fusionagi.memory.sharding import shard_context
from fusionagi.reasoning.context_loader import build_compact_prompt, load_context_for_reasoning
from fusionagi.reasoning.decomposition import decompose_recursive
from fusionagi.reasoning.gpu_scoring import generate_and_score_gpu
from fusionagi.reasoning.meta_reasoning import challenge_assumptions, detect_contradictions
from fusionagi.reasoning.multi_path import generate_and_score_parallel
from fusionagi.reasoning.recomposition import RecomposedResponse, recompose
from fusionagi.reasoning.tot import ThoughtNode, expand_node, prune_subtree
from fusionagi.schemas.grounding import Citation
from fusionagi.schemas.head import HeadClaim, HeadId, HeadOutput, HeadRisk


@dataclass
class SuperBigBrainConfig:
    """Configuration for Super Big Brain pipeline."""

    max_decomposition_depth: int = 3
    min_depth_before_conclusion: int = 1
    parallel_hypotheses: int = 3
    prune_threshold: float = 0.3
    max_context_chars: int = 4000
    use_gpu: bool = True


def run_super_big_brain(
    prompt: str,
    semantic_graph: SemanticGraphMemory,
    config: SuperBigBrainConfig | None = None,
    adapter: Any | None = None,
) -> RecomposedResponse:
    """
    End-to-end Super Big Brain pipeline:

    1. Decompose prompt -> atomic units
    2. Shard and load context
    3. Run hierarchical ToT with multi-path inference
    4. Recompose with traceability
    5. Persist units/relations to semantic graph
    """
    cfg = config or SuperBigBrainConfig()
    decomp = decompose_recursive(prompt, max_depth=cfg.max_decomposition_depth)
    if not decomp.units:
        return RecomposedResponse(summary="No content to reason over.", confidence=0.0)

    semantic_graph.ingest_decomposition(decomp.units, decomp.relations)
    load_context_for_reasoning(decomp.units, semantic_graph=semantic_graph, sharder=shard_context)  # type: ignore[arg-type]
    compact = build_compact_prompt(decomp.units, max_chars=cfg.max_context_chars)

    hypotheses = [u.content for u in decomp.units[:cfg.parallel_hypotheses] if u.content]
    if not hypotheses:
        hypotheses = [compact[:500]]

    if cfg.use_gpu:
        scored = generate_and_score_gpu(hypotheses, decomp.units)
    else:
        scored = generate_and_score_parallel(hypotheses, decomp.units)
    nodes = [n for n, _ in sorted(scored, key=lambda x: x[1], reverse=True)]
    best = nodes[0] if nodes else ThoughtNode(thought=compact[:300], unit_refs=[u.unit_id for u in decomp.units[:5]])

    if cfg.min_depth_before_conclusion > 0 and best.depth < cfg.min_depth_before_conclusion:
        child = expand_node(best, compact[:200], unit_refs=best.unit_refs)
        child.score = best.score
        best = child

    prune_subtree(best, cfg.prune_threshold)
    assumptions = challenge_assumptions(decomp.units, best.thought)
    contradictions = detect_contradictions(decomp.units)

    recomp = recompose([best], decomp.units)
    recomp.metadata["assumptions_flagged"] = len(assumptions)
    recomp.metadata["contradictions"] = len(contradictions)
    recomp.metadata["depth"] = best.depth

    logger.info(
        "Super Big Brain complete",
        extra={"units": len(decomp.units), "confidence": recomp.confidence},
    )
    return recomp


def _recomposed_to_head_output(
    recomp: RecomposedResponse,
    head_id: HeadId,
) -> HeadOutput:
    """Convert RecomposedResponse to HeadOutput for Dvādaśa integration."""
    claims = [
        HeadClaim(
            claim_text=c,
            confidence=recomp.confidence,
            evidence=[Citation(source_id=uid, excerpt="", confidence=recomp.confidence) for uid in recomp.unit_refs[:3]],
            assumptions=[],
        )
        for c in recomp.key_claims[:5]
    ]
    if not claims:
        claims = [
            HeadClaim(claim_text=recomp.summary, confidence=recomp.confidence, evidence=[], assumptions=[]),
        ]
    risks = []
    if recomp.metadata.get("assumptions_flagged", 0) > 0:
        risks.append(HeadRisk(description="Assumptions flagged; verify before acting", severity="medium"))
    if recomp.metadata.get("contradictions", 0) > 0:
        risks.append(HeadRisk(description="Contradictions detected in context", severity="high"))
    return HeadOutput(
        head_id=head_id,
        summary=recomp.summary,
        claims=claims,
        risks=risks,
        questions=[],
        recommended_actions=["Consider flagged assumptions", "Resolve contradictions if any"],
        tone_guidance="",
    )


class SuperBigBrainReasoningProvider:
    """ReasoningProvider for HeadAgent: uses Super Big Brain pipeline."""

    def __init__(
        self,
        semantic_graph: SemanticGraphMemory | None = None,
        config: SuperBigBrainConfig | None = None,
    ) -> None:
        self._graph = semantic_graph or SemanticGraphMemory()
        self._config = config or SuperBigBrainConfig()

    def produce_head_output(self, head_id: HeadId, prompt: str) -> HeadOutput:
        """Produce HeadOutput using Super Big Brain pipeline."""
        recomp = run_super_big_brain(prompt, self._graph, self._config)
        return _recomposed_to_head_output(recomp, head_id)