Comparing split strings inside fields of two CSV files - csv

Question

I have a CSV file (file1) that looks something like this:
123,info,ONE NAME
124,info,ONE VARIATION
125,info,NAME ANOTHER
126,info,SOME TITLE
and another CSV file (file2) that looks like this:
1,info,NAME FIRST
2,info,TWO VARIATION
3,info,NAME SECOND
4,info,ANOTHER TITLE
My desired output would be:
1,123,NAME FIRST,ONE NAME
3,125,NAME SECOND,NAME ANOTHER
Where if the first word in comma delimited field 3 (ie: NAME in line 1) of file2 is equal to any of the words in field 3 of file1, print a line with format:
field1(file2),field1(file1),field3(file2),field3(file1)
Each file has the same number of lines and matches are only made when each has the same line number.
I know I can split fields and get the first word in field3 in Awk like this:
awk -F"," '{split($3,a," "); print a[1]}' file
But since I'm only moderately competent in Awk, I'm at a loss for how to approach a job where there are two files compared using splits.
I could do it in Python like this:
with open('file1', 'r') as f1, open('file2', 'r') as f2:
l1 = f1.readlines()
l2 = f2.readlines()
for i in range(len(l1)):
line_1 = l1[i].split(',')
line_2 = l2[i].split(',')
field_3_1 = line_1[2].split()
field_3_2 = line_2[2].split()
if field_3_2[0] in field_3_1:
one = ' '.join(field_3_1)
two = ' '.join(field_3_2)
print(','.join((line_2[0], line_1[0], two, one)))
But I'd like to know how a job like this would be done in Awk as occasionally I use shells where only Awk is available.
This seems like a strange task to need to do, and my example I think can be a bit confusing, but I need to perform this to check for broken/ill-formatted data in one of the files.

Answer 1

awk -F, -vOFS=, '
{
num1 = $1
name1 = $3
split(name1, words1, " ")
getline <"file2"
split($3, words2, " ")
for (i in words1)
if (words2[1] == words1[i]) {
print $1, num1, $3, name1
break
}
}
' file1
Output:
1,123,NAME FIRST,ONE NAME
3,125,NAME SECOND,NAME ANOTHER

Answer 2

You can try something along the lines, although the following prints only one match for each line in second file:
awk -F, 'FNR==NR {
count= split($3, words, " ");
for (i=1; i <= count; i++) {
field1hash[words[i]]=$1;
field3hash[$1]=$3;
}
next;
}
{
split($3,words," ");
if (field1hash[words[1]]) {
ff1 = field1hash[words[1]];
print $1","ff1","$3","field3hash[ff1]
}
}' file1 file2

Answer 3

I like #ooga's answer better than this:
awk -F, -v OFS=, '
NR==FNR {
split($NF, a, " ")
data[NR,"word"] = a[1]
data[NR,"id"] = $1
data[NR,"value"] = $NF
next
}
{
n = split($NF, a, " ")
for (i=1; i<=n; i++)
if (a[i] == data[FNR,"word"])
print data[FNR,"id"], $1, data[FNR,"value"], $NF
}
' file2 file1