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wekan
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							#!/bin/bash

# MongoDB Migration Script from version 3 to 7
# This script handles migration with disk space checks, progress tracking, and error handling
#
# IMPORTANT: All operations are contained within SNAP_COMMON directory
# This is the only writable directory in a snap environment

set -e

# Source settings
source $SNAP/bin/wekan-read-settings

# Migration configuration
MIGRATION_LOG="${SNAP_COMMON}/mongodb-migration-log.txt"
MIGRATION_STATUS="${SNAP_COMMON}/mongodb-migration-status.json"
MIGRATION_PROGRESS="${SNAP_COMMON}/mongodb-migration-progress.html"
REVERT_FILE="${SNAP_COMMON}/revert-mongodb-migration.txt"
TEMP_DIR="${SNAP_COMMON}/mongodb-migration-temp"
BACKUP_DIR="${SNAP_COMMON}/mongodb-backup-$(date +%Y%m%d-%H%M%S)"

# MongoDB paths
MONGO3_BIN="/snap/${SNAP_NAME}/current/migratemongo/bin"
MONGO7_BIN="/snap/${SNAP_NAME}/current/bin"
MONGO3_LIB="/snap/${SNAP_NAME}/current/migratemongo/lib"
MONGO7_LIB="/snap/${SNAP_NAME}/current/usr/lib"

# Set up environment for MongoDB 3 tools
export LD_LIBRARY_PATH="${MONGO3_LIB}:${MONGO3_LIB}/x86_64-linux-gnu:${LD_LIBRARY_PATH}"
export PATH="${MONGO3_BIN}:${MONGO7_BIN}:${PATH}"

# Set MongoDB log destination to snapcommon for log file detection
export MONGO_LOG_DESTINATION="snapcommon"

# Validate that all operations are within SNAP_COMMON
validate_snap_common_path() {
    local path="$1"
    local description="$2"

    if [[ "$path" != "${SNAP_COMMON}"* ]]; then
        log_error "Path outside SNAP_COMMON detected: $path ($description)"
        log_error "SNAP_COMMON: $SNAP_COMMON"
        return 1
    fi
    return 0
}

# Validate all critical paths
validate_all_paths() {
    log_message "Validating all paths are within SNAP_COMMON"

    validate_snap_common_path "$MIGRATION_LOG" "Migration log" || return 1
    validate_snap_common_path "$MIGRATION_STATUS" "Migration status" || return 1
    validate_snap_common_path "$MIGRATION_PROGRESS" "Migration progress" || return 1
    validate_snap_common_path "$REVERT_FILE" "Revert file" || return 1
    validate_snap_common_path "$TEMP_DIR" "Temporary directory" || return 1
    validate_snap_common_path "$BACKUP_DIR" "Backup directory" || return 1

    log_success "All paths validated within SNAP_COMMON"
    return 0
}

# Logging functions
log_message() {
    local message="$1"
    local timestamp=$(date '+%Y-%m-%d %H:%M:%S')
    echo "[$timestamp] $message" | tee -a "$MIGRATION_LOG"
}

log_error() {
    local message="$1"
    log_message "ERROR: $message"
}

log_success() {
    local message="$1"
    log_message "SUCCESS: $message"
}

# Disk space checking functions
check_disk_space() {
    local required_space_gb="$1"
    local available_space_gb=$(df "$SNAP_COMMON" | awk 'NR==2 {print int($4/1024/1024)}')

    if [ "$available_space_gb" -lt "$required_space_gb" ]; then
        log_error "Insufficient disk space. Required: ${required_space_gb}GB, Available: ${available_space_gb}GB"
        return 1
    fi

    log_message "Disk space check passed. Available: ${available_space_gb}GB, Required: ${required_space_gb}GB"
    return 0
}

# Progress tracking functions
update_progress() {
    local step="$1"
    local total_steps="$2"
    local description="$3"
    local percentage=$((step * 100 / total_steps))

    # Update JSON status file
    cat > "$MIGRATION_STATUS" << EOF
{
    "step": $step,
    "total_steps": $total_steps,
    "percentage": $percentage,
    "description": "$description",
    "timestamp": "$(date -Iseconds)",
    "status": "running"
}
EOF

    # Update HTML progress page
    cat > "$MIGRATION_PROGRESS" << EOF
<!DOCTYPE html>
<html>
<head>
    <title>MongoDB Migration Progress</title>
    <meta http-equiv="refresh" content="5">
    <style>
        body { font-family: Arial, sans-serif; margin: 40px; }
        .progress-bar { width: 100%; background-color: #f0f0f0; border-radius: 5px; }
        .progress-fill { height: 30px; background-color: #4CAF50; border-radius: 5px; width: ${percentage}%; }
        .status { margin: 20px 0; }
        .error { color: red; }
        .success { color: green; }
    </style>
</head>
<body>
    <h1>MongoDB Migration Progress</h1>
    <div class="progress-bar">
        <div class="progress-fill"></div>
    </div>
    <div class="status">
        <p><strong>Progress:</strong> $step of $total_steps steps ($percentage%)</p>
        <p><strong>Current Step:</strong> $description</p>
        <p><strong>Last Updated:</strong> $(date)</p>
    </div>
    <p><em>This page will refresh automatically every 5 seconds.</em></p>
</body>
</html>
EOF

    log_message "Progress: $step/$total_steps ($percentage%) - $description"
}

# Estimate completion time
estimate_completion_time() {
    local start_time="$1"
    local current_step="$2"
    local total_steps="$3"

    if [ "$current_step" -gt 0 ]; then
        local elapsed=$(($(date +%s) - start_time))
        local avg_time_per_step=$((elapsed / current_step))
        local remaining_steps=$((total_steps - current_step))
        local estimated_remaining=$((remaining_steps * avg_time_per_step))

        local hours=$((estimated_remaining / 3600))
        local minutes=$(((estimated_remaining % 3600) / 60))
        local seconds=$((estimated_remaining % 60))

        echo "${hours}h ${minutes}m ${seconds}s"
    else
        echo "Calculating..."
    fi
}

# Create backup before migration
create_backup() {
    log_message "Creating backup of MongoDB 3 database"

    # Check disk space for backup (estimate 2x current database size)
    local db_size=$(du -s "${SNAP_COMMON}/wekan" 2>/dev/null | awk '{print $1}' || echo "0")
    local required_space=$((db_size * 2 / 1024 / 1024 + 1)) # Convert to GB and add 1GB buffer

    if ! check_disk_space "$required_space"; then
        log_error "Insufficient disk space for backup"
        return 1
    fi

    # Create backup directory
    mkdir -p "$BACKUP_DIR"

    # Copy database files
    if [ -d "${SNAP_COMMON}/wekan" ]; then
        cp -r "${SNAP_COMMON}/wekan" "$BACKUP_DIR/"
        log_success "Database backup created at $BACKUP_DIR"
        return 0
    else
        log_error "No database found to backup"
        return 1
    fi
}

# Check if migration is needed
check_migration_needed() {
    if [ -f "$MIGRATION_STATUS" ]; then
        local status=$(jq -r '.status' "$MIGRATION_STATUS" 2>/dev/null || echo "unknown")
        if [ "$status" = "completed" ]; then
            log_message "Migration already completed"
            return 1
        elif [ "$status" = "running" ]; then
            log_message "Migration already in progress"
            return 0
        fi
    fi

    # Check if we have MongoDB 3 data (either in wekan directory or raw database files)
    if [ -d "${SNAP_COMMON}/wekan" ] && [ ! -f "${SNAP_COMMON}/mongodb-version-7" ]; then
        log_message "MongoDB 3 data detected in wekan directory"
        return 0
    fi

    # Check for MongoDB upgrade needed by examining log file
    if detect_mongodb_upgrade_needed; then
        log_message "MongoDB upgrade needed detected from log file"
        return 0
    fi

    log_message "No migration needed"
    return 1
}

# Detect if MongoDB upgrade is needed by checking log file
detect_mongodb_upgrade_needed() {
    local mongodb_log="${SNAP_COMMON}/mongodb.log"
    
    # Check if MongoDB log file exists
    if [ ! -f "$mongodb_log" ]; then
        log_message "MongoDB log file not found: $mongodb_log"
        return 1
    fi
    
    # Check for the specific error message indicating upgrade is needed
    if grep -q "This version of MongoDB is too recent to start up on the existing data files. Try MongoDB 4.2 or earlier." "$mongodb_log"; then
        log_message "MongoDB upgrade needed detected in log file"
        return 0
    fi
    
    # Also check for similar error messages that might indicate upgrade issues
    if grep -q "too recent to start up on the existing data files" "$mongodb_log"; then
        log_message "MongoDB upgrade needed detected in log file (alternative message)"
        return 0
    fi
    
    log_message "No MongoDB upgrade needed detected in log file"
    return 1
}

# Reset MONGO_LOG_DESTINATION to devnull after successful migration
reset_mongo_log_destination() {
    log_message "Resetting MONGO_LOG_DESTINATION to devnull after successful migration"
    
    # Use snap set to change the setting back to devnull
    if snap set wekan mongo-log-destination="devnull" 2>/dev/null; then
        log_success "MONGO_LOG_DESTINATION reset to devnull successfully"
    else
        log_error "Failed to reset MONGO_LOG_DESTINATION to devnull"
        # Don't fail the migration for this setting issue
    fi
}

# Migrate raw MongoDB 3 database files
migrate_raw_database_files() {
    log_message "Starting raw MongoDB 3 database files migration"

    # Validate paths are within SNAP_COMMON
    if ! validate_snap_common_path "${SNAP_COMMON}" "Database path"; then
        log_error "Database path validation failed"
        return 1
    fi

    # Stop any running MongoDB processes
    log_message "Stopping any running MongoDB processes"
    pkill -f mongod || true
    sleep 3

    # Start MongoDB 3 with raw files
    log_message "Starting MongoDB 3 with raw database files"
    local mongo3_pid
    mongod --dbpath "${SNAP_COMMON}" --port "${MONGODB_PORT:-27019}" --quiet &
    mongo3_pid=$!

    # Wait for MongoDB 3 to start
    local retry_count=0
    while [ $retry_count -lt 30 ]; do
        if mongosh --quiet --eval "db.adminCommand('ping')" "mongodb://localhost:${MONGODB_PORT:-27019}/admin" >/dev/null 2>&1; then
            log_message "MongoDB 3 started successfully"
            break
        fi
        sleep 1
        retry_count=$((retry_count + 1))
    done

    if [ $retry_count -eq 30 ]; then
        log_error "MongoDB 3 failed to start"
        kill $mongo3_pid 2>/dev/null || true
        return 1
    fi

    # Dump all databases from MongoDB 3
    log_message "Dumping databases from MongoDB 3"
    if ! mongodump --port "${MONGODB_PORT:-27019}" --out "$TEMP_DIR" --dbpath "${SNAP_COMMON}"; then
        log_error "Failed to dump databases from MongoDB 3"
        kill $mongo3_pid 2>/dev/null || true
        return 1
    fi

    # Stop MongoDB 3
    log_message "Stopping MongoDB 3"
    kill $mongo3_pid 2>/dev/null || true
    sleep 3

    # Start MongoDB 7
    log_message "Starting MongoDB 7"
    local mongo7_pid
    mongod --dbpath "${SNAP_COMMON}" --port "${MONGODB_PORT:-27019}" --quiet &
    mongo7_pid=$!

    # Wait for MongoDB 7 to start
    retry_count=0
    while [ $retry_count -lt 30 ]; do
        if mongosh --quiet --eval "db.adminCommand('ping')" "mongodb://localhost:${MONGODB_PORT:-27019}/admin" >/dev/null 2>&1; then
            log_message "MongoDB 7 started successfully"
            break
        fi
        sleep 1
        retry_count=$((retry_count + 1))
    done

    if [ $retry_count -eq 30 ]; then
        log_error "MongoDB 7 failed to start"
        kill $mongo7_pid 2>/dev/null || true
        return 1
    fi

    # Restore databases to MongoDB 7
    log_message "Restoring databases to MongoDB 7"
    if ! mongorestore --port "${MONGODB_PORT:-27019}" --dbpath "${SNAP_COMMON}" "$TEMP_DIR"; then
        log_error "Failed to restore databases to MongoDB 7"
        kill $mongo7_pid 2>/dev/null || true
        return 1
    fi

    # Stop MongoDB 7
    log_message "Stopping MongoDB 7"
    kill $mongo7_pid 2>/dev/null || true
    sleep 3

    # Clean up old MongoDB 3 files
    log_message "Cleaning up old MongoDB 3 files"
    find "${SNAP_COMMON}" -maxdepth 1 -name "*.0" -o -name "*.1" -o -name "*.ns" -o -name "j._*" -o -name "mongod.lock" | while read -r file; do
        if [ -f "$file" ]; then
            rm -f "$file"
            log_message "Removed old file: $file"
        fi
    done

    # Remove journal directory if it exists
    if [ -d "${SNAP_COMMON}/journal" ]; then
        rm -rf "${SNAP_COMMON}/journal"
        log_message "Removed journal directory"
    fi

    log_success "Raw database files migration completed successfully"
    
    # Reset MONGO_LOG_DESTINATION to devnull after successful migration
    reset_mongo_log_destination
    
    return 0
}

# Snap channel detection and switching functions
get_current_snap_channel() {
    local snap_name="$1"
    snap list "$snap_name" 2>/dev/null | awk 'NR==2 {print $4}' || echo "unknown"
}

is_wekan_snap() {
    local snap_name="$1"
    case "$snap_name" in
        wekan|wekan-gantt-gpl|wekan-ondra)
            return 0
            ;;
        *)
            return 1
            ;;
    esac
}

switch_to_stable_channel() {
    local snap_name="$1"
    local current_channel=$(get_current_snap_channel "$snap_name")

    if [ "$current_channel" != "stable" ] && [ "$current_channel" != "unknown" ]; then
        log_message "Switching $snap_name from $current_channel to stable channel"

        if snap refresh "$snap_name" --channel=stable; then
            log_success "Successfully switched $snap_name to stable channel"
            return 0
        else
            log_error "Failed to switch $snap_name to stable channel"
            return 1
        fi
    else
        log_message "$snap_name is already on stable channel or not installed"
        return 0
    fi
}

switch_all_wekan_snaps_to_stable() {
    log_message "Checking for Wekan-related snaps to switch to stable channel"

    local wekan_snaps=("wekan" "wekan-gantt-gpl" "wekan-ondra")
    local switched_count=0
    local failed_count=0

    for snap_name in "${wekan_snaps[@]}"; do
        if snap list "$snap_name" >/dev/null 2>&1; then
            if switch_to_stable_channel "$snap_name"; then
                switched_count=$((switched_count + 1))
            else
                failed_count=$((failed_count + 1))
            fi
        fi
    done

    log_message "Channel switching completed: $switched_count successful, $failed_count failed"

    if [ "$failed_count" -gt 0 ]; then
        return 1
    else
        return 0
    fi
}

# Get database collections
get_collections() {
    local mongo_url="$1"
    local collections=$(mongosh --quiet --eval "db.getCollectionNames().join('\n')" "$mongo_url" 2>/dev/null | grep -v "^$" || echo "")
    echo "$collections"
}

# Migrate a single collection
migrate_collection() {
    local collection="$1"
    local mongo3_url="$2"
    local mongo7_url="$3"
    local step="$4"
    local total_steps="$5"

    log_message "Migrating collection: $collection"

    # Check disk space before each collection (estimate 2x collection size)
    local collection_size=$(mongosh --quiet --eval "db.$collection.stats().size" "$mongo3_url" 2>/dev/null || echo "0")
    local required_space=$((collection_size * 2 / 1024 / 1024 / 1024 + 1)) # Convert to GB and add 1GB buffer

    if ! check_disk_space "$required_space"; then
        log_error "Insufficient disk space for collection $collection"
        return 1
    fi

    # Dump collection
    local dump_file="${TEMP_DIR}/${collection}.bson"
    log_message "Dumping collection $collection to $dump_file"

    if ! mongodump --db wekan --collection "$collection" --out "$TEMP_DIR" --port "${MONGODB_PORT:-27019}" --dbpath "${SNAP_COMMON}"; then
        log_error "Failed to dump collection $collection"
        return 1
    fi

    # Restore collection
    log_message "Restoring collection $collection to MongoDB 7"
    if ! mongorestore --db wekan --collection "$collection" "$dump_file" --port "${MONGODB_PORT:-27019}" --dbpath "${SNAP_COMMON}"; then
        log_error "Failed to restore collection $collection"
        return 1
    fi

    # Update progress
    update_progress "$step" "$total_steps" "Migrated collection: $collection"

    # Clean up dump file
    rm -f "$dump_file"

    log_success "Collection $collection migrated successfully"
    return 0
}

# Main migration function
perform_migration() {
    local start_time=$(date +%s)

    log_message "Starting MongoDB migration from version 3 to 7"

    # Create backup before migration
    log_message "Creating backup before migration"
    if ! create_backup; then
        log_error "Failed to create backup, aborting migration"
        return 1
    fi

    # Create temporary directory
    mkdir -p "$TEMP_DIR"

    # Check if we need to migrate raw database files
    if detect_mongodb_upgrade_needed; then
        log_message "MongoDB upgrade needed detected, starting raw file migration"
        if ! migrate_raw_database_files; then
            log_error "Failed to migrate raw database files"
            return 1
        fi
    fi

    # Get MongoDB connection details
    local mongo3_url="mongodb://localhost:${MONGODB_PORT:-27019}/wekan"
    local mongo7_url="mongodb://localhost:${MONGODB_PORT:-27019}/wekan"

    # Get collections to migrate
    log_message "Getting list of collections to migrate"
    local collections=$(get_collections "$mongo3_url")

    if [ -z "$collections" ]; then
        log_error "No collections found to migrate"
        return 1
    fi

    local collection_count=$(echo "$collections" | wc -l)
    log_message "Found $collection_count collections to migrate"

    # Migrate each collection
    local current_step=0
    for collection in $collections; do
        current_step=$((current_step + 1))

        if ! migrate_collection "$collection" "$mongo3_url" "$mongo7_url" "$current_step" "$collection_count"; then
            log_error "Migration failed at collection $collection"
            return 1
        fi

        # Update completion time estimate
        local estimated_time=$(estimate_completion_time "$start_time" "$current_step" "$collection_count")
        log_message "Estimated completion time: $estimated_time"
    done

    # Mark migration as completed
    cat > "$MIGRATION_STATUS" << EOF
{
    "step": $collection_count,
    "total_steps": $collection_count,
    "percentage": 100,
    "description": "Migration completed successfully",
    "timestamp": "$(date -Iseconds)",
    "status": "completed"
}
EOF

    # Create MongoDB 7 version marker
    touch "${SNAP_COMMON}/mongodb-version-7"

    # Clean up temporary files
    rm -rf "$TEMP_DIR"

    # Switch Wekan snaps to stable channel after successful migration
    log_message "Switching Wekan snaps to stable channel after successful migration"
    if switch_all_wekan_snaps_to_stable; then
        log_success "All Wekan snaps switched to stable channel successfully"
    else
        log_error "Some Wekan snaps failed to switch to stable channel"
        # Don't fail the migration for channel switching issues
    fi

    log_success "MongoDB migration completed successfully"
    
    # Reset MONGO_LOG_DESTINATION to devnull after successful migration
    reset_mongo_log_destination
    
    return 0
}

# Revert migration
revert_migration() {
    log_message "Reverting MongoDB migration"

    if [ ! -f "$REVERT_FILE" ]; then
        log_error "Revert file not found: $REVERT_FILE"
        return 1
    fi

    # Stop MongoDB 7
    log_message "Stopping MongoDB 7"
    snapctl stop --disable "${SNAP_NAME}.mongodb"

    # Remove MongoDB 7 version marker
    rm -f "${SNAP_COMMON}/mongodb-version-7"

    # Find the most recent backup directory
    local latest_backup=$(ls -td "${SNAP_COMMON}/mongodb-backup-"* 2>/dev/null | head -1)

    if [ -n "$latest_backup" ] && [ -d "$latest_backup" ]; then
        log_message "Restoring from backup: $latest_backup"

        # Stop any running MongoDB processes
        pkill -f mongod || true
        sleep 2

        # Remove current database directory
        rm -rf "${SNAP_COMMON}/wekan"

        # Restore from backup
        cp -r "$latest_backup"/* "${SNAP_COMMON}/"

        # Clean up backup directory
        rm -rf "$latest_backup"

        log_success "Database restored from backup"
    else
        log_error "No backup found for revert"
        return 1
    fi

    # Remove revert file
    rm -f "$REVERT_FILE"

    # Clear migration status
    rm -f "$MIGRATION_STATUS"

    # Start MongoDB 3
    log_message "Starting MongoDB 3"
    snapctl start --enable "${SNAP_NAME}.mongodb"

    log_success "Migration reverted successfully"
    return 0
}

# Main execution
main() {
    log_message "MongoDB Migration Script started"

    # Validate all paths are within SNAP_COMMON
    if ! validate_all_paths; then
        log_error "Path validation failed - aborting migration"
        exit 1
    fi

    # Check if revert is requested
    if [ -f "$REVERT_FILE" ]; then
        revert_migration
        exit $?
    fi

    # Check if migration is needed
    if ! check_migration_needed; then
        exit 0
    fi

    # Perform migration
    if perform_migration; then
        log_success "Migration completed successfully"
        exit 0
    else
        log_error "Migration failed"
        exit 1
    fi
}

# Run main function
main "$@"