"""Domain→agent mapping and domain detection — single source of truth.

Extracted from evaluate.py and merge.py (Phase 3 refactor).
All domain classification logic goes through this module.
"""

import re

# Canonical domain→agent mapping. Every domain must have exactly one primary agent.
DOMAIN_AGENT_MAP: dict[str, str] = {
    "internet-finance": "Rio",
    "entertainment": "Clay",
    "health": "Vida",
    "ai-alignment": "Theseus",
    "space-development": "Astra",
    "mechanisms": "Rio",
    "living-capital": "Rio",
    "living-agents": "Theseus",
    "teleohumanity": "Leo",
    "grand-strategy": "Leo",
    "critical-systems": "Theseus",
    "collective-intelligence": "Theseus",
    "teleological-economics": "Rio",
    "cultural-dynamics": "Clay",
}

# Valid domain names — derived from the map, not maintained separately.
VALID_DOMAINS: frozenset[str] = frozenset(DOMAIN_AGENT_MAP.keys())

# Inverse mapping: agent name (lowercase) → primary domain (for branch detection).
_AGENT_PRIMARY_DOMAIN: dict[str, str] = {
    "rio": "internet-finance",
    "clay": "entertainment",
    "theseus": "ai-alignment",
    "vida": "health",
    "astra": "space-development",
    "leo": "grand-strategy",
}


def agent_for_domain(domain: str | None) -> str:
    """Get the reviewing agent for a domain. Falls back to Leo."""
    if domain is None:
        return "Leo"
    return DOMAIN_AGENT_MAP.get(domain, "Leo")


def detect_domain_from_diff(diff: str) -> str | None:
    """Detect primary domain from changed file paths in a unified diff.

    Checks domains/, entities/, core/, foundations/ for domain classification.
    Returns the most-referenced domain, or None if no domain files found.
    """
    domain_counts: dict[str, int] = {}
    for line in diff.split("\n"):
        if line.startswith("diff --git"):
            # Check domains/ and entities/ (both carry domain info)
            match = re.search(r"(?:domains|entities)/([^/]+)/", line)
            if match:
                d = match.group(1)
                domain_counts[d] = domain_counts.get(d, 0) + 1
                continue
            # Check core/ subdirectories
            match = re.search(r"core/([^/]+)/", line)
            if match:
                d = match.group(1)
                if d in DOMAIN_AGENT_MAP:
                    domain_counts[d] = domain_counts.get(d, 0) + 1
                    continue
            # Check foundations/ subdirectories
            match = re.search(r"foundations/([^/]+)/", line)
            if match:
                d = match.group(1)
                if d in DOMAIN_AGENT_MAP:
                    domain_counts[d] = domain_counts.get(d, 0) + 1
    if domain_counts:
        return max(domain_counts, key=domain_counts.get)
    return None


def detect_domain_from_branch(branch: str) -> str | None:
    """Extract domain from branch name like 'rio/claims-futarchy' → 'internet-finance'.

    Uses agent prefix → primary domain mapping for pipeline branches.
    """
    prefix = branch.split("/")[0].lower() if "/" in branch else ""
    return _AGENT_PRIMARY_DOMAIN.get(prefix)