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# flake8: noqa
from langchain.prompts.prompt import PromptTemplate
from langchain.prompts.chat import (
SystemMessagePromptTemplate,
HumanMessagePromptTemplate,
ChatPromptTemplate,
AIMessagePromptTemplate,
)
from langchain.chains.prompt_selector import (
ConditionalPromptSelector,
is_chat_model,
)
DEFAULT_REFINE_PROMPT_TMPL = (
"The original question is as follows: {question}\n"
"We have provided an existing answer: {existing_answer}\n"
"We have the opportunity to refine the existing answer"
"(only if needed) with some more context below.\n"
"------------\n"
"{context_str}\n"
"------------\n"
"Given the new context, refine the original answer to better "
"answer the question. "
"If the context isn't useful, return the original answer."
)
DEFAULT_REFINE_PROMPT = PromptTemplate(
input_variables=["question", "existing_answer", "context_str"],
template=DEFAULT_REFINE_PROMPT_TMPL,
)
refine_template = (
"We have the opportunity to refine the existing answer"
"(only if needed) with some more context below.\n"
"------------\n"
"{context_str}\n"
"------------\n"
"Given the new context, refine the original answer to better "
"answer the question. "
"If the context isn't useful, return the original answer."
)
messages = [
HumanMessagePromptTemplate.from_template("{question}"),
AIMessagePromptTemplate.from_template("{existing_answer}"),
HumanMessagePromptTemplate.from_template(refine_template),
]
CHAT_REFINE_PROMPT = ChatPromptTemplate.from_messages(messages)
REFINE_PROMPT_SELECTOR = ConditionalPromptSelector(
default_prompt=DEFAULT_REFINE_PROMPT,
conditionals=[(is_chat_model, CHAT_REFINE_PROMPT)],
)
DEFAULT_TEXT_QA_PROMPT_TMPL = (
"Context information is below. \n"
"---------------------\n"
"{context_str}"
"\n---------------------\n"
"Given the context information and not prior knowledge, "
"answer the question: {question}\n"
)
DEFAULT_TEXT_QA_PROMPT = PromptTemplate(
input_variables=["context_str", "question"], template=DEFAULT_TEXT_QA_PROMPT_TMPL
)
chat_qa_prompt_template = (
"Context information is below. \n"
"---------------------\n"
"{context_str}"
"\n---------------------\n"
"Given the context information and not prior knowledge, "
"answer any questions"
)
messages = [
SystemMessagePromptTemplate.from_template(chat_qa_prompt_template),
HumanMessagePromptTemplate.from_template("{question}"),
]
CHAT_QUESTION_PROMPT = ChatPromptTemplate.from_messages(messages)
QUESTION_PROMPT_SELECTOR = ConditionalPromptSelector(
default_prompt=DEFAULT_TEXT_QA_PROMPT,
conditionals=[(is_chat_model, CHAT_QUESTION_PROMPT)],
)
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