import os
import random
import uuid
from typing import Any, Dict, List, Optional

from .bundle import write_bundle_zip


def _env_fingerprint() -> Dict[str, Any]:
    return {
        "python": os.environ.get("PYTHON_VERSION") or "unknown",
        "space": os.environ.get("SPACE_ID") or os.environ.get("HF_SPACE_ID") or "unknown",
    }


def _mk_event(kind: str, step: str, payload: Dict[str, Any]) -> Dict[str, Any]:
    return {"kind": kind, "step": step, "payload": payload}


def make_demo_bundle_zip(out_path: str, *, seed: int, chaos: float, label: str) -> str:
    """
    Creates a synthetic agent timeline with controlled randomness.
    'chaos' increases divergence probability.
    Also includes reward_total in state snapshots to demonstrate reward delta.
    """
    rng = random.Random(seed)
    run_id = f"demo-{label}-{uuid.uuid4().hex[:8]}"
    framework = "demo-agent"
    model_id = "demo-llm"

    events: List[Dict[str, Any]] = []
    memory: Dict[str, Any] = {"goal": "reach_target", "notes": []}
    reward_total = 0.0

    # Optional replay link template (demo)
    replay = {
        "base_url": "https://example.com/replay",
        "pattern": "/?run_id={run_id}&i={i}",
    }

    for i in range(40):
        action = rng.choice(["scan", "move", "ask_tool", "write_memory"])
        if rng.random() < chaos:
            action = rng.choice(["scan", "move", "ask_tool", "write_memory", "panic"])

        score = rng.random()
        events.append(_mk_event("plan_step", f"t{i}.plan", {"action": action, "score": score}))

        if action == "ask_tool":
            q = rng.choice(["price", "status", "latency", "risk"])
            events.append(_mk_event("tool_call", f"t{i}.tool_call", {"tool": "mock_api", "query": q}))
            if rng.random() < (0.15 + chaos * 0.2):
                events.append(_mk_event("tool_result", f"t{i}.tool_result", {"ok": False, "error": "timeout"}))
                reward_total -= 0.5
            else:
                val = rng.randint(1, 100)
                events.append(_mk_event("tool_result", f"t{i}.tool_result", {"ok": True, "value": val}))
                reward_total += 0.2
        elif action == "write_memory":
            note = rng.choice(["cached", "retry", "validated", "unsafe", "needs_review"])
            memory["notes"].append(note)
            events.append(_mk_event("memory_write", f"t{i}.mem", {"write": {"notes": list(memory["notes"])}}))
            reward_total += 0.05
        elif action == "panic":
            events.append(_mk_event("guardrail", f"t{i}.guardrail", {"blocked": True, "reason": "anomaly"}))
            events.append(
                _mk_event("state_snapshot", f"t{i}.state", {"memory": memory, "mode": "halt", "reward_total": reward_total})
            )
            break
        else:
            # scan/move
            x = rng.randint(0, 9)
            y = rng.randint(0, 9)
            reward_total += 0.01
            events.append(_mk_event("state_snapshot", f"t{i}.state", {"x": x, "y": y, "memory": memory, "reward_total": reward_total}))

        txt = rng.choice(
            [
                "Proceed with caution.",
                "Tool looks stable.",
                "Memory updated.",
                "Need more evidence.",
                "I will retry once.",
            ]
        )
        if rng.random() < chaos:
            txt = rng.choice(
                [
                    "Unexpected output detected.",
                    "I am uncertain; escalating.",
                    "This seems inconsistent.",
                    "Plan changed due to drift.",
                ]
            )
        events.append(_mk_event("llm_sample", f"t{i}.llm", {"text": txt, "tokens": rng.randint(20, 180)}))

    return write_bundle_zip(
        out_path,
        run_id=run_id,
        framework=framework,
        model_id=model_id,
        env_fingerprint=_env_fingerprint(),
        events_payloads=events,
        replay=replay,
    )


def fork_patch_bundle(
    out_path: str,
    *,
    source_zip: str,
    fork_at_index: int,
    patch_kind: Optional[str] = None,
    patch_step: Optional[str] = None,
    patch_payload_json: Optional[Dict[str, Any]] = None,
) -> str:
    """
    Counterfactual workflow: patch an event at index N, re-hash-chain into a new bundle.
    """
    from .bundle import load_bundle, write_bundle_zip

    b = load_bundle(source_zip)
    src_events = b.events

    payloads: List[Dict[str, Any]] = []
    for ev in src_events:
        payloads.append(
            {
                "ts": ev.get("ts"),
                "kind": ev.get("kind"),
                "step": ev.get("step"),
                "payload": ev.get("payload", {}),
            }
        )

    if 0 <= fork_at_index < len(payloads):
        if patch_kind:
            payloads[fork_at_index]["kind"] = patch_kind
        if patch_step:
            payloads[fork_at_index]["step"] = patch_step
        if patch_payload_json is not None:
            payloads[fork_at_index]["payload"] = patch_payload_json

    new_run = f"{b.manifest.get('run_id','run')}-fork"
    return write_bundle_zip(
        out_path,
        run_id=new_run,
        framework=b.manifest.get("framework", "unknown"),
        model_id=b.manifest.get("model_id", "unknown"),
        env_fingerprint=b.manifest.get("env", {}),
        events_payloads=payloads,
        replay=b.manifest.get("replay"),
        run_url=b.manifest.get("run_url"),
    )