#!/bin/bash

# Script to automatically resolve .gitattributes conflicts for multiple HuggingFace PRs
# Usage: ./resolve-gitattributes-conflicts.sh <start_pr> <end_pr>

if [ $# -ne 2 ]; then
    echo "Usage: $0 <start_pr_number> <end_pr_number>"
    echo "Example: $0 1 5"
    exit 1
fi

START_PR=$1
END_PR=$2

# Validate inputs are numbers
if ! [[ "$START_PR" =~ ^[0-9]+$ ]] || ! [[ "$END_PR" =~ ^[0-9]+$ ]]; then
    echo "Error: PR numbers must be integers"
    exit 1
fi

if [ $START_PR -gt $END_PR ]; then
    echo "Error: Start PR number must be less than or equal to end PR number"
    exit 1
fi

echo "Resolving .gitattributes conflicts for PRs $START_PR through $END_PR..."

# Function to resolve gitattributes conflict
resolve_gitattributes() {
    local pr_num=$1
    
    echo "Processing PR #$pr_num..."
    
    # Fetch and checkout the PR
    if ! git fetch origin refs/pr/$pr_num:pr/$pr_num 2>/dev/null; then
        echo "  ❌ Failed to fetch PR #$pr_num (may not exist)"
        return 1
    fi
    
    git checkout pr/$pr_num 2>/dev/null
    
    # Try to merge with main to trigger any conflicts
    echo "  🔄 Attempting merge with main..."
    merge_output=$(git merge main 2>&1)
    merge_status=$?
    
    if [ $merge_status -eq 0 ]; then
        echo "  ℹ️  No conflicts found in PR #$pr_num (merge successful)"
    else
        echo "  🔧 Merge conflicts detected, resolving..."
        
        # Check if .gitattributes has conflicts and resolve them
        if [ -f .gitattributes ] && grep -q "^<<<<<<<" .gitattributes; then
            echo "  🔧 Resolving .gitattributes conflict..."
            # Remove conflict markers and duplicate lines
            grep -v "^<<<<<<<" .gitattributes | \
            grep -v "^=======" | \
            grep -v "^>>>>>>>" | \
            sort -u > .gitattributes.tmp
            
            mv .gitattributes.tmp .gitattributes
        fi
    fi
    
    # Always stage all files and commit/push regardless of merge status
    echo "  📦 Staging all files..."
    git add .
    
    # Commit (this will work whether there were conflicts or not)
    if git commit -m "Merge with main - auto-resolved" 2>/dev/null; then
        echo "  ✅ Changes committed"
    else
        echo "  ℹ️  No changes to commit (already up to date)"
    fi
    
    # Always try to push
    echo "  🚀 Pushing to HuggingFace..."
    if git push origin pr/$pr_num:refs/pr/$pr_num 2>/dev/null; then
        echo "  ✅ Successfully pushed to HuggingFace PR #$pr_num"
    else
        echo "  ❌ Failed to push to HuggingFace PR #$pr_num"
        return 1
    fi
    
    return 0
}

# Main loop
success_count=0
total_count=0

for pr_num in $(seq $START_PR $END_PR); do
    total_count=$((total_count + 1))
    
    if resolve_gitattributes $pr_num; then
        success_count=$((success_count + 1))
    fi
    
    echo ""
done

# Summary
echo "============================================"
echo "Summary:"
echo "  Total PRs processed: $total_count"
echo "  Successfully resolved: $success_count"
echo "  Failed: $((total_count - success_count))"
echo "============================================"

# Return to main branch
git checkout main 2>/dev/null || git checkout master 2>/dev/null
git pull
echo "Done! Returned to main branch."