"""analyze.py — the engine orchestrator.

Consumes ONLY the contract shapes from a loader (Event[]/Turn[]/session). NEVER
reads raw JSONL. NO model. Runs the deterministic pipeline in dependency order:

  1. errors      → ToolCall.errored        (loops need this)
  2. provenance  → ToolCall.{provenance,sourceTool,flowValue}, Turn.{direct,indirect}
  3. loops       → real loops + near-identical hints (per turn)
  4. rereads     → re-read patterns (per turn)
  5. heavy       → Turn.heavy (top-3 by COST) + Turn.overBudget (cost >= floor)
  6. guidance    → Turn.guide (silence unless a named pattern fires) + Findings
  7. tokens      → session rollup + cacheRead/out ratio + cost

Returns enriched {turns, events, session, findings}.
"""
from __future__ import annotations

from typing import Any, Optional

from engine.core import clusters, errors, heavy, hygiene, loops, pins, provenance, rereads, tokens
from engine.core.guidance import attach_guides, build_findings, build_recommendations
from engine.core.provenance import ProvenanceConfig


def analyze(
    loaded: dict[str, Any],
    provenance_config: Optional[ProvenanceConfig] = None,
) -> dict[str, Any]:
    """Run the full deterministic engine over a loader's output (in place + return).

    `loaded` is exactly what engine.loaders.*.load(path) returns:
      {'events': [...], 'turns': [...], 'session': {...}}
    """
    turns = loaded["turns"]
    events = loaded["events"]
    session = loaded.get("session", {})

    # 1) error signal (loops depend on it)
    errors.annotate_errors(turns)

    # 2) value-flow provenance (precision is the release gate)
    provenance.annotate_provenance(turns, session, provenance_config)

    # 3) loops (real + near-identical hints)
    loops_by_turn = loops.detect_all_loops(turns)

    # 4) re-reads
    rereads_by_turn = rereads.detect_all_rereads(turns)

    # 5) heavy turns (top-N by COST) + absolute over-budget floor
    heavy_indices = heavy.annotate_heavy(turns)
    over_budget_indices = heavy.over_budget_turns(turns)

    # 6) tool clusters: flailing on an external CLI with no skill loaded (silence
    #    unless it fired). Session-level, list-free; cited fix from the knowledge file.
    tool_clusters = clusters.detect_tool_clusters(turns)

    # 7) guidance: per-turn guides (silence unless a pattern fires) + findings
    attach_guides(turns, rereads_by_turn, loops_by_turn)
    findings = build_findings(
        turns, rereads_by_turn, loops_by_turn, heavy_indices, tool_clusters
    )
    # extra fixable signals (read-bursts, unverified edits, near-repeats, unloaded MCP)
    read_bursts = hygiene.detect_read_bursts(turns)
    unverified = hygiene.detect_unverified_edits(turns)
    near_repeats = hygiene.detect_near_repeats(loops_by_turn)
    unloaded_mcp = hygiene.detect_unloaded_mcp(turns)
    # unpinned package runners (`npx pkg` with no @version) — a generally-recommended
    # signal only (no Anthropic practice); reuses the binary splitter, never alters
    # any token/turn/loop count. Reads the contract dicts like binaries.extract_binaries.
    npx_unpinned = pins.detect_npx_unpinned([t.to_dict() for t in turns])

    # session-level "what could have been better": fixable signals, abstracted +
    # cited (silence => empty list, an honest "expensive but clean").
    recommendations = build_recommendations(
        turns, tool_clusters, read_bursts, unverified, near_repeats, unloaded_mcp,
        npx_unpinned,
    )

    # 8) session token rollup + always-present cacheRead/out ratio, plus the
    #    point-in-time context-window "fuel gauge" (peak fill, trajectory, compactions)
    sess_tokens = tokens.rollup(turns)
    sess_context = tokens.context_window(turns, model=session.get("model"))

    # totals for the session header
    total_tools = sum(len(t.tools) for t in turns)
    total_indirect = sum(t.indirect for t in turns)
    total_direct = sum(t.direct for t in turns)
    indirect_ratio = (total_indirect / total_tools) if total_tools else 0.0

    session_out = dict(session)
    session_out.update(
        {
            "tokens": sess_tokens["tokens"],
            "cost": sess_tokens["tokens"].get("cost", 0),  # cost-weighted total (ranking key)
            "cacheReadOverOut": sess_tokens["cacheReadOverOut"],
            "context": sess_context,  # fuel gauge: peak fill / 1M, trajectory, compactions

            "turns": len(turns),
            "humanTurns": sum(1 for t in turns if t.origin == "human"),
            "systemTurns": sum(1 for t in turns if t.origin == "system"),
            "tools": total_tools,
            "direct": total_direct,
            "indirect": total_indirect,
            "indirectRatio": indirect_ratio,
            "heavyTurns": heavy_indices,
            "overBudgetTurns": over_budget_indices,
            "toolClusters": tool_clusters,
        }
    )

    return {
        "turns": turns,
        "events": events,
        "session": session_out,
        "findings": findings,
        "recommendations": recommendations,
    }


def analyze_path(
    path: str,
    provenance_config: Optional[ProvenanceConfig] = None,
) -> dict[str, Any]:
    """Convenience: load a JSONL path through the seam, then analyze."""
    from engine.loaders.jsonl_loader import load

    return analyze(load(path), provenance_config)