#!/usr/bin/env bash
# check_odoo_diff.sh
#
# Diff a single Odoo Enterprise accounting module across two pinned snapshots
# and produce a categorized change report.
#
# Usage:
#   tools/check_odoo_diff.sh <module> <from_version> <to_version> [<output_md>]
#
# Example:
#   tools/check_odoo_diff.sh account_accountant v19 v20 reports/v20_accountant_diff.md

set -euo pipefail

MODULE="${1:?Usage: check_odoo_diff.sh <module> <from_version> <to_version> [<output_md>]}"
FROM="${2:?from_version required (e.g. v19)}"
TO="${3:?to_version required (e.g. v20)}"
OUT="${4:-/dev/stdout}"

ROOT="${REPACKAGED_ODOO_ROOT:-/Users/gurpreet/Github/RePackaged-Odoo}"
FROM_DIR="$ROOT/accounting-$FROM/$MODULE"
TO_DIR="$ROOT/accounting-$TO/$MODULE"

if [ ! -d "$FROM_DIR" ]; then
    echo "ERROR: $FROM_DIR does not exist. Snapshot $FROM not yet present?" >&2
    exit 1
fi
if [ ! -d "$TO_DIR" ]; then
    echo "ERROR: $TO_DIR does not exist. Snapshot $TO not yet present?" >&2
    exit 1
fi

classify() {
    local f="$1"
    case "$f" in
        */views/*|*/static/src/components/*|*/report/*|*/wizard/*_views.xml|*/wizards/*_views.xml)
            echo "[MIRROR]" ;;
        */models/*_engine.py|*/services/*)
            echo "[ABSTRACT]" ;;
        */__manifest__.py)
            echo "[MANIFEST]" ;;
        */tests/*)
            echo "[TEST]" ;;
        *)
            echo "[REVIEW]" ;;
    esac
}

{
    echo "# Diff Report: $MODULE ($FROM -> $TO)"
    echo ""
    echo "Generated: $(date '+%Y-%m-%d %H:%M:%S')"
    echo ""
    echo "## Changed Files (with classification suggestion)"
    echo ""
    diff -ruN --brief "$FROM_DIR" "$TO_DIR" | while read -r line; do
        case "$line" in
            "Files "*" and "*" differ")
                file=$(echo "$line" | sed -E 's/^Files (.+) and .+ differ$/\1/' | sed "s|$FROM_DIR/||")
                tag=$(classify "$file")
                echo "- $tag \`$file\`"
                ;;
            "Only in $TO_DIR"*)
                file=$(echo "$line" | sed -E "s|Only in $TO_DIR(.*): (.+)|\1/\2|" | sed "s|^/||")
                tag=$(classify "$file")
                echo "- $tag NEW: \`$file\`"
                ;;
            "Only in $FROM_DIR"*)
                file=$(echo "$line" | sed -E "s|Only in $FROM_DIR(.*): (.+)|\1/\2|" | sed "s|^/||")
                tag=$(classify "$file")
                echo "- $tag REMOVED: \`$file\`"
                ;;
        esac
    done
    echo ""
    echo "## Full Diff (truncated to first 2000 lines)"
    echo ""
    echo '```diff'
    diff -ruN "$FROM_DIR" "$TO_DIR" | head -2000
    echo '```'
} > "$OUT"

echo "Diff report written to: $OUT" >&2