# Copyright 2026 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


import os

from google.adk.agents.llm_agent import LlmAgent
from google.adk.tools.bigquery.bigquery_credentials import BigQueryCredentialsConfig
from google.adk.tools.bigquery.bigquery_toolset import BigQueryToolset
from google.adk.tools.bigquery.config import BigQueryToolConfig
from google.adk.tools.bigquery.config import WriteMode
import google.auth

# Check necessary environment variables
if not (google_cloud_project_id := os.getenv("GOOGLE_CLOUD_PROJECT")):
  raise ValueError(
      "GOOGLE_CLOUD_PROJECT environment variable is not set. Please set it"
      " to the GCP project ID where your BigQuery jobs would be run."
  )

# Define an appropriate application name
BIGQUERY_AGENT_NAME = "adk_eval_bigquery_agent"


# Define BigQuery tool config with write mode set to allowed. Note that this is
# only to demonstrate the full capability of the BigQuery tools. In production
# you may want to change to BLOCKED (default write mode, effectively makes the
# tool read-only) or PROTECTED (only allows writes in the anonymous dataset of a
# BigQuery session) write mode.
tool_config = BigQueryToolConfig(
    write_mode=WriteMode.BLOCKED,
    application_name=BIGQUERY_AGENT_NAME,
    compute_project_id=google_cloud_project_id,
)

# Initialize the tools to use the application default credentials.
# https://cloud.google.com/docs/authentication/provide-credentials-adc
application_default_credentials, _ = google.auth.default()
credentials_config = BigQueryCredentialsConfig(
    credentials=application_default_credentials
)

bigquery_toolset = BigQueryToolset(
    credentials_config=credentials_config, bigquery_tool_config=tool_config
)

# The variable name `root_agent` determines what your root agent is for the
# debug CLI
root_agent = LlmAgent(
    model="gemini-2.5-flash",
    name=BIGQUERY_AGENT_NAME,
    description=(
        "Agent to answer questions about BigQuery data and models and execute"
        " SQL queries."
    ),
    instruction=f"""\
        You are a data science agent with access to several BigQuery tools.
        Make use of those tools to answer the user's questions.

        You must use the project id {google_cloud_project_id} for running SQL
        queries and generating data insights
    """,
    tools=[bigquery_toolset],
)