#!/bin/bash
#
# Generate Commit Message Library
#
# Uses ML content generator service to create semantic commit messages
# for release deployments based on changed files and diff summary.
#

set -e
set -u

generate_commit_message() {
    local CHANGED_FILES="$1"
    local DIFF_SUMMARY="$2"
    local ML_SERVICE_URL="${ML_CONTENT_GENERATOR_URL:-http://10.9.0.1:8004}"

    # Build prompt for ML service
    local PROMPT="Generate a semantic commit message for a release deployment.

Changed files:
$CHANGED_FILES

Changes summary:
$DIFF_SUMMARY

Format requirements:
- Use conventional commit format
- First line: chore(release): <brief description> (max 72 characters)
- Body: Detailed bullet points of major changes
- Group by service/area
- Focus on user-facing changes

Example:
chore(release): v1.2.3 - Add user authentication and improve performance

- feat(auth): Implement JWT-based authentication system
- feat(api): Add rate limiting middleware
- fix(webmap-router): Resolve deployment config injection bug
- perf(drive-service): Optimize file upload handling"

    # Call ML service /complete endpoint
    local RESPONSE=$(curl -s -X POST "${ML_SERVICE_URL}/complete/" \
        -H "Content-Type: application/json" \
        -d "{
            \"prompt\": $(echo "$PROMPT" | jq -Rs .),
            \"max_tokens\": 200,
            \"temperature\": 0.3,
            \"system_message\": \"You are a git commit message generator. Create concise, conventional commit messages.\"
        }" 2>/dev/null)

    if [ $? -eq 0 ] && [ -n "$RESPONSE" ]; then
        # Extract completion from JSON response
        local COMPLETION=$(echo "$RESPONSE" | jq -r '.completion' 2>/dev/null)

        if [ -n "$COMPLETION" ] && [ "$COMPLETION" != "null" ]; then
            echo "$COMPLETION"
            return 0
        fi
    fi

    # Fallback if ML service unavailable
    generate_fallback_commit_message "$CHANGED_FILES"
}

generate_fallback_commit_message() {
    local CHANGED_FILES="$1"

    # Count changed files
    local FILE_COUNT=$(echo "$CHANGED_FILES" | wc -l)

    # Extract unique service names
    local SERVICES=$(echo "$CHANGED_FILES" | grep -E '@services|@apps' | cut -d'/' -f1-2 | sort -u | head -5 | tr '\n' ', ' | sed 's/,$//')

    # Fallback message
    cat <<EOF
chore(release): Deploy changes from main

Changed files: $FILE_COUNT
Services affected: $SERVICES

⚠️  Manual review required - ML service unavailable
Full diff available in release notes
EOF
}

# Export functions
export -f generate_commit_message
export -f generate_fallback_commit_message