"""Claude Code and opencode usage, relayed from llm-cost-dashboard's API.

Everything here is read-only. The dashboard stays the owner of the data and the
pricing; deck-it only renders it.
"""

import json
import urllib.request

from ..module import Module

ENDPOINTS = ("/api/claude_limits", "/api/claude_session", "/api/summary", "/api/last_session")


def _fetch_for(base):
    def fetch(endpoint):
        with urllib.request.urlopen(base + endpoint, timeout=2) as r:
            return json.loads(r.read())
    return fetch


def _opencode(rows) -> dict:
    """Aggregate /api/summary's per-model rows into opencode's cost and tokens."""
    picked = [r for r in rows if isinstance(r, dict) and r.get("program") == "opencode"]
    models = [
        {"provider": r.get("provider") or "", "model": r.get("model") or "",
         "cost": r.get("total_cost_usd") or 0, "tokens": r.get("tokens") or 0,
         "calls": r.get("calls") or 0}
        for r in picked
    ]
    models.sort(key=lambda r: r["cost"], reverse=True)
    return {
        "cost": round(sum(r["cost"] for r in models), 4),
        "tokens": sum(r["tokens"] for r in models),
        "calls": sum(r["calls"] for r in models),
        "models": models,
    }


def _claude_model(session) -> str | None:
    models = (session or {}).get("models") or []
    return models[0].get("model") if models else None


def _opencode_session(sessions) -> dict:
    """The latest opencode session's dominant model from /api/last_session."""
    for block in sessions or []:
        if not isinstance(block, dict) or block.get("program") != "opencode":
            continue
        rows = block.get("rows") or []
        top = max(rows, key=lambda r: r.get("calls") or 0) if rows else {}
        return {
            "model": top.get("model"),
            "provider": top.get("provider"),
            "session_cost": round(sum(r.get("cost_usd") or 0 for r in rows), 4),
            "session_tokens": sum(r.get("tokens") or 0 for r in rows),
            "session_calls": sum(r.get("calls") or 0 for r in rows),
        }
    return {"model": None, "provider": None, "session_cost": None,
            "session_tokens": 0, "session_calls": 0}


def make(cfg: dict) -> Module:
    base = cfg.get("llm", {}).get("url", "http://127.0.0.1:8420").rstrip("/")
    fetch = cfg.get("fetch") or _fetch_for(base)

    def state():
        try:
            data = {ep: fetch(ep) for ep in ENDPOINTS}
        except (OSError, ValueError):
            return {"offline": True}
        limits = data["/api/claude_limits"]
        if isinstance(limits, dict):
            latest = limits.get("latest") or {}
        elif isinstance(limits, list) and limits:
            latest = limits[-1]
        else:
            latest = {}
        claude_session = (data.get("/api/claude_session") or {}).get("session")
        sessions = (data.get("/api/last_session") or {}).get("sessions") or []
        return {
            "offline": False,
            "claude": {
                "context_pct": latest.get("context_pct"),
                "five_hour_pct": latest.get("five_hour_pct"),
                "five_hour_resets_at": latest.get("five_hour_resets_at"),
                "seven_day_pct": latest.get("seven_day_pct"),
                "seven_day_resets_at": latest.get("seven_day_resets_at"),
                "extra_used": latest.get("extra_used_credits"),
                "extra_limit": latest.get("extra_monthly_limit"),
                "extra_utilization": latest.get("extra_utilization"),
                "extra_currency": latest.get("extra_currency"),
                "model": _claude_model(claude_session),
            },
            "opencode": {**_opencode(data.get("/api/summary") or []),
                         **_opencode_session(sessions)},
        }

    return Module(name="llm", title="LLM usage", state=state)