"""
Version 3
---------

Update to naming used for projection

Function Performed
------------------

Generate Substrait Plans and Corresponding SQL via Ibis

Requirements
------------
pip install ibis ibis-substrait pyarrow

Run Script
----------
python generate_substrait_projections_with_names.py <path-to-save-directory>

Example:
    python generate_substrait_projections_with_names.py /home/veloxuser/sandbox/queries
    
Output
------    

Within the specified folder *.sql files will contain the SQL queries and
*.json files will contain the Substrait plans. Corresponding SQL query and 
JSON plan has the same query id

queries/
├── q0.sql
├── q0_substrait.json
├── q10.sql
├── q10_substrait.json
├── q1.sql
├── q1_substrait.json
├── q2.sql
├── q2_substrait.json
├── q3.sql
├── q3_substrait.json
├── q4.sql
├── q4_substrait.json
├── q5.sql
├── q5_substrait.json
├── q6.sql
├── q6_substrait.json
├── q7.sql
├── q7_substrait.json
├── q8.sql
├── q8_substrait.json
├── q9.sql
└── q9_substrait.json

"""

import os
import sys

import ibis
from ibis_substrait.compiler.core import SubstraitCompiler
from google.protobuf import json_format, text_format

def separator(char="="):
    return char * 80

def table():
    return ibis.table([("a", "string"), ("b", "float"), ("c", "int32"), ("d", "int64"), ("e", "int64")], "t",)

def write_sql(expr, fname_base):
    f = open(fname_base + ".sql", "w")
    ibis.show_sql(expr, file=f)
    f.close()

def write_json_plan(expr, fname_base):
    compiler = SubstraitCompiler()
    proto = compiler.compile(expr)
    json_plan = json_format.MessageToJson(proto)
    with open(fname_base+"_substrait.json", "w") as f:
        f.write(json_plan)
        
def write_proto_str_plan(expr, fname_base):
    compiler = SubstraitCompiler()
    proto = compiler.compile(expr)
    json_plan = text_format.MessageToString(proto)
    with open(fname_base+"_substrait.txt", "w") as f:
        f.write(json_plan)

def write_sql_and_json(base_path, exprs):
    for idx, expr in enumerate(exprs):
        fname = os.path.join(base_path, "q"+str(idx))
        write_sql(expr, fname)
        write_json_plan(expr, fname)

def write_sql_and_proto_str(base_path, exprs):
    for idx, expr in enumerate(exprs):
        fname = os.path.join(base_path, "q"+str(idx))
        write_sql(expr, fname)
        write_proto_str_plan(expr, fname)


# input table
t = table()

# Expressions

# outputs two columns
expr0 = t.projection(["b", "a"])

# add a constant value
f1 = lambda x : x + 100
expr1 = t.projection(add_100=f1(t.d))

# take in two columns with a lambda (or inbuilt function)
f2 = lambda x, y : x + y
expr2 = t.projection(d_plus_e=f2(t.d, t.e))

# multi-expressions with a column name, function with scalar, function with variable inputs
expr3 = t.projection("a", d_plus_100=f1(t.d), d_plus_e=f2(t.d, t.e))

# multi-expressions with a column name, function with scalar, function with variable input and scalar input
expr4 = t.projection("a", d_plus_100=f1(t.d), d_plus_5=f2(t.d, 5))

# multi-expressions with a column name, function of a function 
expr5 = t.projection("a", d_plus_100=f1(t.d), d_plus_5_plus_100=f1(f2(t.d, 5)))

# comparison operation
f3 = lambda x, y : x > y
expr6 = t.projection(d_greater_than_e=f3(t.d, t.e))

# with aggregates
expr7 = t.group_by(["a"]).aggregate([t.c.sum().name("s1"), t.e.count().name("s2")]).projection(["s1", "s2"])

# nested
expr8 = t.group_by(["a"]).aggregate([t.c.sum().name("s1"), t.e.count().name("s2")]).projection(["a", "s1", "s2"]).projection(["a", "s1"])

# series
expr9 = t.projection(["d", "c", "e"]).filter(f3(t.d, t.e)).projection(["d", "e"])

# nested series
expr10 = t.projection(["d", "c", "e"]).filter(f3(t.d, t.e)).projection(["d", "e"]).projection(d_plus_100=f1(t.d), e_plus_100=f1(t.e), d_greater_than_e=f3(t.d, t.e))

if __name__ == "__main__":

    args = sys.argv

    if len(args) != 2:
        print("help>>>")
        print("\t python generate_substrait_projections.py <path-to-save-directory>")
        
    elif os.path.exists(args[1]):
        write_sql_and_proto_str(base_path=args[1], exprs=[expr0, expr1, expr2, 
                                                    expr3, expr4, expr5,
                                                    expr6, expr7, expr8,
                                                    expr9, expr10])
    else:
        print("Please enter a valid path to save files")