"""Phase 0: Requirements Discovery Node."""

import logging
from typing import Any, Dict
from app.states.state import GCPArchitectureState
from app.skills.loader import SkillLoader

logger = logging.getLogger(__name__)


def discover_node(state: GCPArchitectureState, skill_loader: SkillLoader) -> Dict[str, Any]:
    """Processes Phase 0 Discovery: document functional/non-functional requirements with product selection deferred."""
    logger.info("Executing discover_node")
    skill_prompt = skill_loader.format_skills_for_prompt("discover")

    # Generate or format requirements document baseline
    request_summary = state.get("workflow_request", "Event-driven HTTP application reference architecture")
    
    requirements_doc = f"""# Step 0 — Requirements discovery

## Workflow request
{request_summary}

## Functional requirements
- Accept authenticated HTTPS requests from external clients.
- Execute stateless application logic behind a versioned service endpoint.
- Publish asynchronous domain events from the application.
- Process events independently and tolerate retry/redelivery.
- Persist durable objects and application state separately.
- Expose operational logs, metrics, and audit-relevant events.
- Support repeatable infrastructure changes through declarative IaC.

## Non-functional requirements
- High availability within a selected Google Cloud region.
- Horizontal scale for bursty HTTP traffic and asynchronous work.
- At-least-once event delivery with idempotent consumers.
- Encryption in transit and at rest using managed defaults initially.
- Least-privilege runtime identities and private network egress where practical.
- Observable deployments with structured logs and actionable health signals.
- Reproducible, reviewable, non-deployment validation in CI.

## Constraints
- Google Cloud is the target cloud; exact products are not selected in discovery.
- Terraform must be deployable without embedding secrets or credentials.
- The baseline must not provision resources during validation.
- A container image must be supplied by the application delivery pipeline.
- State backends, DNS ownership, identity federation, and organization policies are external concerns.

## Assumptions
- A single region is acceptable for the initial deployment.
- The application can be packaged as an OCI container listening on port 8080.
- Events can use at-least-once semantics and consumers can deduplicate.
- A dedicated Google Cloud project is available.
- Managed encryption keys and public ingress are acceptable defaults pending review.

## Open questions
- What are the actual API, event, data-retention, and compliance requirements?
- Which clients and identity provider must authenticate requests?
- What are traffic, payload-size, latency, RTO, and RPO targets?
- Which data is relational, document, object, or analytical?

**Product selection deferred:** `true` for this phase.
"""

    active_skills = state.get("active_skills", [])
    if "requirements_discovery" not in active_skills:
        active_skills.append("requirements_discovery")

    return {
        "requirements_doc": requirements_doc,
        "product_selection_deferred": True,
        "current_phase": "discover",
        "active_skills": active_skills,
    }