#!/bin/bash

# Setup logging
LOG_FILE="_build/script_log_$(date +%Y%m%d_%H%M%S).log"
log_message() {
    local timestamp="$(date '+%Y-%m-%d %H:%M:%S')"
    echo "[$timestamp] $1" | tee -a "$LOG_FILE"
}

# Check input file
INPUT_FILE="$1"

if [[ -z "$INPUT_FILE" ]]; then
    log_message "ERROR: No input file provided. Usage: $0 <input_file>"
    exit 1
fi

if [[ ! -f "$INPUT_FILE" ]]; then
    log_message "ERROR: Input file '$INPUT_FILE' does not exist."
    exit 1
fi

log_message "INFO: Starting script with input file: $INPUT_FILE"

# Counter for processed lines
processed_count=0
error_count=0

while IFS=':' read -r file_path line_err status desc data; do
    ((processed_count++))
    
    # Trim whitespace from variables
    file_path="$(echo "$file_path" | xargs)"
    line_err="$(echo "$line_err" | xargs)"
    status="$(echo "$status" | xargs)"
    desc="$(echo "$desc" | xargs)"
    data="$(echo "$data" | xargs | tr -d "'")"  # Remove single quotes from data
    
    # Log the current line being processed
    log_message "DEBUG: Processing line $processed_count - File: $file_path, Desc: $desc, Data: $data"

    if [[ -z "$file_path" ]]; then
        log_message "WARNING: Empty file path encountered at line $processed_count"
        ((error_count++))
        continue
    fi

    if [[ ! -f "$file_path" ]]; then
        log_message "ERROR: File not found: $file_path at line $processed_count"
        ((error_count++))
        continue
    fi

    if [[ ! -w "$file_path" ]]; then
        log_message "ERROR: File not writable: $file_path at line $processed_count"
        ((error_count++))
        continue
    fi

    case "$desc" in
        "undefined label"|*"toctree contains reference to nonexisting document"*)
            fixed_data="$(echo "$data" | tr '\\/_' '-')"
            if sed -i "s@$data@$fixed_data@g" "$file_path" 2>>"$LOG_FILE"; then
                log_message "INFO: Successfully fixed issue in $file_path: '$data' -> '$fixed_data'"
            else
                log_message "ERROR: Failed to modify $file_path"
                ((error_count++))
            fi
            ;;
        *)
            log_message "DEBUG: No matching condition for description: $desc"
            ;;
    esac

done < "$INPUT_FILE"

# Final summary
log_message "INFO: Script completed"
log_message "INFO: Total lines processed: $processed_count"
log_message "INFO: Total errors encountered: $error_count"

# Exit with appropriate status
if [[ $error_count -gt 0 ]]; then
    log_message "WARNING: Script completed with $error_count errors"
    exit 1
else
    log_message "INFO: Script completed successfully"
    exit 0
fi