#!/bin/bash

# Glossary Consistency Validation Script
# Validates glossary structure and reports statistics

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
GLOSSARY_FILE="${GLOSSARY_FILE:-$PROJECT_ROOT/docs_zh-CN/.glossary.json}"
OUTPUT_FILE="${GLOSSARY_OUTPUT_FILE:-$PROJECT_ROOT/docs_zh-CN/glossary-consistency-report.txt}"

# Check if jq is installed
if ! command -v jq &> /dev/null; then
    echo "Error: jq is not installed. Please install jq to run this script."
    echo "  Ubuntu/Debian: sudo apt-get install jq"
    echo "  macOS: brew install jq"
    exit 1
fi

# Initialize report
{
    echo "Glossary Consistency Report"
    echo "==========================="
    echo "Generated: deterministic"
    echo ""
    echo "Glossary File: docs_zh-CN/.glossary.json"
    echo ""
    echo "----------------------------------------"
    echo ""
} > "$OUTPUT_FILE"

# Check if glossary file exists
if [[ ! -f "$GLOSSARY_FILE" ]]; then
    {
        echo "ERROR: Glossary file not found at docs_zh-CN/.glossary.json."
        echo ""
        echo "Please create the glossary file first."
    } >> "$OUTPUT_FILE"
    echo "Error: Glossary file not found!"
    exit 1
fi

# Validate JSON structure
if ! jq empty "$GLOSSARY_FILE" 2>/dev/null; then
    {
        echo "ERROR: Invalid JSON in glossary file."
        echo "Please check the file format."
    } >> "$OUTPUT_FILE"
    echo "Error: Invalid JSON in glossary file!"
    exit 1
fi

# Extract metadata
{
    echo "METADATA"
    echo "========"
    echo ""
    echo "Version:"
    jq -r '.metadata.version' "$GLOSSARY_FILE" | sed 's/^/  /'
    echo ""
    echo "Created:"
    jq -r '.metadata.created' "$GLOSSARY_FILE" | sed 's/^/  /'
    echo ""
    echo "Last Updated:"
    jq -r '.metadata.last_updated' "$GLOSSARY_FILE" | sed 's/^/  /'
    echo ""
    echo "----------------------------------------"
    echo ""
} >> "$OUTPUT_FILE"

# Extract term count
TERM_COUNT=$(jq -r '.metadata.total_terms // 0' "$GLOSSARY_FILE")
ACTUAL_TERM_COUNT=$(jq -r '.terms | if type == "object" then length else -1 end' "$GLOSSARY_FILE")
VALIDATION_FAILED=0

{
    echo "GLOSSARY STATISTICS"
    echo "==================="
    echo ""
    echo "Total Terms: $TERM_COUNT"
    echo "Actual Terms: $ACTUAL_TERM_COUNT"
    echo ""
} >> "$OUTPUT_FILE"

if [[ "$ACTUAL_TERM_COUNT" -lt 0 || "$TERM_COUNT" -ne "$ACTUAL_TERM_COUNT" ]]; then
    echo "ERROR: metadata.total_terms does not match the terms object." >> "$OUTPUT_FILE"
    VALIDATION_FAILED=1
fi

if [[ "$TERM_COUNT" -eq 0 ]]; then
    echo "Glossary is empty. No terms to analyze." >> "$OUTPUT_FILE"
else
    # Get top 10 terms
    {
        echo "Top 10 Terms (alphabetical):"
        echo ""
        jq -r '.terms | to_entries | sort_by(.key) | .[0:10][] | "  \(.key): \(.value.translation // "N/A")"' "$GLOSSARY_FILE" 2>/dev/null || echo "  Unable to extract terms"
        echo ""
    } >> "$OUTPUT_FILE"

    # Check for required fields
    {
        echo "Field Validation:"
        echo ""
        MISSING_TRANSLATIONS_FILE="$(mktemp)"
        jq -r '.terms | to_entries[] | select((.value | type) != "object" or (.value.translation | type) != "string" or (.value.translation | gsub("\\s"; "") | length) == 0) | "  Missing translation: \(.key)"' "$GLOSSARY_FILE" > "$MISSING_TRANSLATIONS_FILE"

        if [[ -s "$MISSING_TRANSLATIONS_FILE" ]]; then
            cat "$MISSING_TRANSLATIONS_FILE" >> "$OUTPUT_FILE"
            VALIDATION_FAILED=1
        else
            echo "  All terms have translations." >> "$OUTPUT_FILE"
        fi

        rm -f "$MISSING_TRANSLATIONS_FILE"
        echo ""
    } >> "$OUTPUT_FILE"
fi

# Consistency checks
{
    echo "----------------------------------------"
    echo ""
    echo "CONSISTENCY CHECKS"
    echo "=================="
    echo ""
} >> "$OUTPUT_FILE"

# Check for duplicate English terms
DUPLICATES=$(jq -r '.terms | keys[]' "$GLOSSARY_FILE" | sort | uniq -d)

if [[ -n "$DUPLICATES" ]]; then
    echo "WARNING: Duplicate term keys found:" >> "$OUTPUT_FILE"
    echo "$DUPLICATES" | sed 's/^/  /' >> "$OUTPUT_FILE"
else
    echo "No duplicate term keys found." >> "$OUTPUT_FILE"
fi

{
    echo ""
    echo "----------------------------------------"
    echo ""
    echo "VALIDATION COMPLETE"
    echo ""
    if [[ "$VALIDATION_FAILED" -eq 0 ]]; then
        echo "Glossary file is valid and ready for use."
    else
        echo "Glossary file is invalid; see errors above."
    fi
} >> "$OUTPUT_FILE"

echo "Glossary validation complete. Report saved to:"
echo "  docs_zh-CN/glossary-consistency-report.txt"
echo ""
echo "Summary:"
echo "  Total Terms: $TERM_COUNT"
if [[ "$VALIDATION_FAILED" -eq 0 ]]; then
    echo "  Status: Valid ✓"
else
    echo "  Status: Invalid ✗"
    exit 1
fi