#!/bin/sh

# Allow the human lead architect to bypass this gate explicitly via:
# ALLOW_CORE_CHANGES=true git commit -m "Architect manual override"
if [ "$ALLOW_CORE_CHANGES" = "true" ]; then
    echo "🔓 Lead Architect override detected. Proceeding with commit..."
    exit 0
fi

CHANGED_FILES=$(git diff --cached --name-only --diff-filter=ACM | grep -E '\.(ts|js|py|rs|go)$')
MAX_DIFF_LINES=300
SOFT_LINE_CAP=200
HARD_LINE_CAP=350

# 1. Total Diff Volume Verification
TOTAL_LINES_CHANGED=$(git diff --cached --numstat | awk '{add += $1; subs += $2} END {print add + subs}')
if [ -n "$TOTAL_LINES_CHANGED" ] && [ "$TOTAL_LINES_CHANGED" -gt "$MAX_DIFF_LINES" ]; then
    echo "❌ COMMIT REJECTED: Total diff size ($TOTAL_LINES_CHANGED lines) exceeds the $MAX_DIFF_LINES layer cap."
    echo "Instruct the agent to break down the task into smaller, atomic commits."
    exit 1
fi

# 2. File-Specific Length Constraints (Soft vs Hard)
for FILE in $CHANGED_FILES; do
    if [ -f "$FILE" ]; then
        LINE_COUNT=$(wc -l < "$FILE")

        if [ "$LINE_COUNT" -gt "$HARD_LINE_CAP" ]; then
            echo "❌ COMMIT REJECTED: $FILE is $LINE_COUNT lines. Hard limit is $HARD_LINE_CAP lines."
            echo "The agent has violated modular architecture rules. Decompose this module."
            exit 1
        elif [ "$LINE_COUNT" -gt "$SOFT_LINE_CAP" ]; then
            echo "⚠️ WARNING: $FILE has grown to $LINE_COUNT lines (Soft cap is $SOFT_LINE_CAP)."
        fi
    fi
done

# 3. Authoritative Core Architecture & Build Protection Lock
if git diff --cached --name-only | grep -E '^(src/core/|src/domain/|.*lock.*|Dockerfile|\.github/)'; then
    echo "❌ COMMIT REJECTED: Modification detected in a core architectural directory or system build spec."
    echo "Agents are strictly forbidden from writing to these layers."
    echo ""
    echo "💡 Human Override: If this change is intentional, execute:"
    echo "   ALLOW_CORE_CHANGES=true git commit -m 'your message'"
    exit 1
fi

exit 0