"""Profile-driven Glas gateway.

The gateway resolves a versioned harness profile before creating a sandbox.
There is deliberately no default rein or model in governed execution.
"""

from __future__ import annotations

import time
import uuid
from datetime import UTC, datetime

from sandboxer.core.manager import SandboxManager
from sandboxer.models import Consumer, SandboxCreateRequest

from glas_harness import hub
from glas_harness.contract import (
    CONTRACT_VERSION,
    ExecutionEvidence,
    ExecutionRequest,
    ExecutionSummary,
    GatewayResult,
    Rein,
    SandboxHandle,
    ToolCall,
    ToolResult,
)
from glas_harness.profiles import ProfileCatalog


def _now() -> str:
    return datetime.now(UTC).isoformat()


def _request_refs(request: ExecutionRequest) -> dict:
    refs = {
        "assignment_ref": request.assignment_ref,
        "role_ref": request.role_ref,
        "duty_ref": request.duty_ref,
        "goal_refs": request.goal_refs,
        "resource_envelope_refs": request.resource_envelope_refs,
        "expected_output": request.expected_output,
    }
    return {key: value for key, value in refs.items() if value not in (None, [], "")}


def run_execution(
    request: ExecutionRequest,
    *,
    catalog: ProfileCatalog | None = None,
    rein: Rein | None = None,
    manager: SandboxManager | None = None,
) -> GatewayResult:
    """Resolve and run one request, returning evidence for every outcome."""

    request_id = request.request_id or str(uuid.uuid4())
    started_at = _now()
    started = time.monotonic()
    catalog = catalog or ProfileCatalog()
    refs = _request_refs(request)

    profile = None
    descriptor = None
    sandbox_id: str | None = None
    tool_result: ToolResult | None = None
    summary: ExecutionSummary | None = None
    outcome = "failed"
    failure_stage = None
    error: str | None = None

    try:
        profile, descriptor = catalog.resolve(request.harness_profile_ref)
        selected_rein = rein or catalog.build_rein(profile, descriptor)
    except Exception as exc:
        outcome = "refused"
        failure_stage = "resolution"
        error = str(exc)
        result = _build_result(
            request=request,
            request_id=request_id,
            started_at=started_at,
            started=started,
            outcome=outcome,
            failure_stage=failure_stage,
            error=error,
            profile=profile,
            descriptor=descriptor,
            sandbox_id=None,
            tool_result=None,
            summary=None,
            refs=refs,
        )
        _report(request, result)
        return result

    manager = manager or SandboxManager()
    status = None
    try:
        try:
            status = manager.create(
                SandboxCreateRequest(
                    profile=profile.sandbox_profile,
                    inputs={"repo": request.repo},
                    consumer=Consumer(actor=request.actor, project=request.project),
                    ttl=None,
                )
            )
            sandbox_id = status.sandbox_id
        except Exception as exc:
            failure_stage = "sandbox_create"
            error = str(exc)
            raise

        reachability = (
            status.reachability.model_dump(mode="json", exclude_none=True)
            if status.reachability
            else {}
        )
        sandbox = SandboxHandle(
            sandbox_id=status.sandbox_id,
            host=status.host or "",
            reachability=reachability,
        )

        try:
            session = selected_rein.start_session(
                profile,
                {
                    "title": request.title,
                    "description": request.description,
                    "target_repo": request.repo,
                    "request_id": request_id,
                },
                sandbox,
            )
        except Exception as exc:
            failure_stage = "session_start"
            error = str(exc)
            raise

        try:
            tool_result = selected_rein.dispatch_tool(
                session, ToolCall(name="run_task", actor=request.actor)
            )
        except Exception as exc:
            failure_stage = "execution"
            error = str(exc)
            raise

        try:
            summary = selected_rein.end_session(session)
        except Exception as exc:
            failure_stage = "session_end"
            error = str(exc)
            raise

        if tool_result.ok and summary.outcome == "succeeded":
            outcome = "succeeded"
        else:
            outcome = summary.outcome if summary.outcome in {"failed", "refused"} else "failed"
            failure_stage = "execution"
            error = tool_result.error or summary.reason or "rein reported unsuccessful execution"
    except Exception:
        # The exact error/stage is captured above. All paths still tear down and
        # return normalized evidence rather than leaking a provider exception.
        pass
    finally:
        if status is not None:
            try:
                manager.destroy(status.sandbox_id)
            except Exception as exc:
                if outcome == "succeeded" or not error:
                    outcome = "failed"
                    failure_stage = "teardown"
                    error = str(exc)

    result = _build_result(
        request=request,
        request_id=request_id,
        started_at=started_at,
        started=started,
        outcome=outcome,
        failure_stage=failure_stage,
        error=error,
        profile=profile,
        descriptor=descriptor,
        sandbox_id=sandbox_id,
        tool_result=tool_result,
        summary=summary,
        refs=refs,
    )
    _report(request, result)
    return result


def run_task_through_rein(
    *,
    harness_profile: str,
    repo: str,
    title: str,
    description: str,
    rein: Rein | None = None,
    actor: str = "agt",
    project: str = "glas-harness",
    manager: SandboxManager | None = None,
    catalog: ProfileCatalog | None = None,
    report_to_hub: bool = True,
) -> dict:
    """Compatibility-shaped wrapper around the versioned execution request.

    It intentionally requires a harness profile. Direct rein injection is
    retained only as a library/test seam and never selects a default backend.
    """

    result = run_execution(
        ExecutionRequest(
            harness_profile_ref=harness_profile,
            repo=repo,
            title=title,
            description=description,
            actor=actor,
            project=project,
            report_to_hub=report_to_hub,
        ),
        catalog=catalog,
        rein=rein,
        manager=manager,
    )
    return result.model_dump(mode="json")


def _build_result(
    *,
    request: ExecutionRequest,
    request_id: str,
    started_at: str,
    started: float,
    outcome: str,
    failure_stage: str | None,
    error: str | None,
    profile,
    descriptor,
    sandbox_id: str | None,
    tool_result: ToolResult | None,
    summary: ExecutionSummary | None,
    refs: dict,
) -> GatewayResult:
    duration = max(0.0, time.monotonic() - started)
    resolved_model = (
        (summary.resolved_model if summary else None)
        or (tool_result.resolved_model if tool_result else None)
        or (profile.model.model if profile else None)
    )
    tokens_spent = (
        summary.tokens_spent if summary and summary.tokens_spent is not None
        else tool_result.tokens_spent if tool_result else None
    )
    execution_duration = (
        summary.duration_s if summary and summary.duration_s is not None
        else tool_result.duration_s if tool_result else None
    )
    evidence_error = error if failure_stage == "resolution" else (
        f"{failure_stage} failed; inspect direct caller error" if error and failure_stage else None
    )
    evidence = ExecutionEvidence(
        request_id=request_id,
        correlation_id=request.correlation_id,
        actor=request.actor,
        project=request.project,
        target_repo=request.repo,
        contract_version=CONTRACT_VERSION,
        profile_ref=str(profile.ref) if profile else None,
        rein_id=descriptor.id if descriptor else None,
        rein_version=descriptor.version if descriptor else None,
        model_route=profile.model.route if profile else None,
        resolved_model=resolved_model,
        sandbox_profile=profile.sandbox_profile if profile else None,
        sandbox_id=sandbox_id,
        tool_profile=profile.tool_profile if profile else None,
        outcome=outcome,
        failure_stage=failure_stage,
        error=evidence_error,
        started_at=started_at,
        finished_at=_now(),
        duration_s=execution_duration if execution_duration is not None else duration,
        tokens_spent=tokens_spent,
        token_budget=profile.limits.budget_tokens if profile else None,
        commit_sha=summary.commit_sha if summary else None,
        artifacts=summary.artifacts if summary else [],
        tool_events_count=len(tool_result.events) if tool_result else 0,
        tool_events_completeness=(
            tool_result.events_completeness if tool_result else "unavailable"
        ),
        refs=refs,
    )
    return GatewayResult(
        ok=outcome == "succeeded",
        evidence=evidence,
        tool_output=tool_result.output if tool_result else "",
        tool_error=error or (tool_result.error if tool_result else None),
    )


def _report(request: ExecutionRequest, result: GatewayResult) -> None:
    if not request.report_to_hub:
        return
    evidence = result.evidence.model_dump(mode="json", exclude_none=True)
    hub.post_progress_event(
        summary=(
            f"gateway run: {request.title} "
            f"({'ok' if result.ok else result.evidence.outcome})"
        ),
        event_type="gateway_run",
        detail=evidence,
    )