# Copyright 2022 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.

"""Vertex AI Search Utilities"""
from os.path import basename

from google.cloud import discoveryengine_v1alpha as discoveryengine

JSON_INDENT = 2


def list_documents(
    project_id: str,
    location: str,
    datastore_id: str,
) -> list[dict[str, str]]:
    client = discoveryengine.DocumentServiceClient()

    parent = client.branch_path(
        project=project_id,
        location=location,
        data_store=datastore_id,
        branch="default_branch",
    )

    request = discoveryengine.ListDocumentsRequest(parent=parent, page_size=10)

    page_result = client.list_documents(request=request)

    return [
        {"id": document.id, "title": basename(document.content.uri)}
        for document in page_result
    ]


def search_enterprise_search(
    project_id: str,
    location: str,
    engine_id: str,
    page_size: int = 50,
    search_query: str | None = None,
    image_bytes: bytes | None = None,
    params: dict | None = None,
    summary_model: str | None = None,
    summary_preamble: str | None = None,
) -> tuple[list[dict[str, str | list]], str, str, str, str]:
    if bool(search_query) == bool(image_bytes):
        raise ValueError("Cannot provide both search_query and image_bytes")

    # Create a client
    client = discoveryengine.SearchServiceClient()

    serving_config = f"projects/{project_id}/locations/{location}/collections/default_collection/engines/{engine_id}/servingConfigs/default_config"

    # Configuration options for search
    content_search_spec = discoveryengine.SearchRequest.ContentSearchSpec(
        snippet_spec=discoveryengine.SearchRequest.ContentSearchSpec.SnippetSpec(
            return_snippet=True
        ),
        summary_spec=discoveryengine.SearchRequest.ContentSearchSpec.SummarySpec(
            summary_result_count=5,
            include_citations=True,
            ignore_adversarial_query=True,
            ignore_non_summary_seeking_query=True,
            model_spec=discoveryengine.SearchRequest.ContentSearchSpec.SummarySpec.ModelSpec(
                version=summary_model
            ),
            model_prompt_spec=discoveryengine.SearchRequest.ContentSearchSpec.SummarySpec.ModelPromptSpec(
                preamble=summary_preamble
            ),
        ),
        extractive_content_spec=discoveryengine.SearchRequest.ContentSearchSpec.ExtractiveContentSpec(
            max_extractive_answer_count=1, max_extractive_segment_count=1
        ),
    )

    request = discoveryengine.SearchRequest(
        serving_config=serving_config,
        page_size=page_size,
        content_search_spec=content_search_spec,
        query_expansion_spec=discoveryengine.SearchRequest.QueryExpansionSpec(
            condition=discoveryengine.SearchRequest.QueryExpansionSpec.Condition.AUTO,
        ),
        spell_correction_spec=discoveryengine.SearchRequest.SpellCorrectionSpec(
            mode=discoveryengine.SearchRequest.SpellCorrectionSpec.Mode.AUTO
        ),
        params=params,
    )

    if search_query:
        request.query = search_query
    elif image_bytes:
        request.image_query = discoveryengine.SearchRequest.ImageQuery(
            image_bytes=image_bytes
        )

    try:
        response_pager = client.search(request)
    except Exception as exc:
        raise exc

    response = discoveryengine.SearchResponse(
        results=response_pager.results,
        facets=response_pager.facets,
        guided_search_result=response_pager.guided_search_result,
        total_size=response_pager.total_size,
        attribution_token=response_pager.attribution_token,
        next_page_token=response_pager.next_page_token,
        corrected_query=response_pager.corrected_query,
        summary=response_pager.summary,
    )

    request_url = (
        f"https://discoveryengine.googleapis.com/v1alpha/{serving_config}:search"
    )

    request_json = discoveryengine.SearchRequest.to_json(
        request,
        including_default_value_fields=False,
        use_integers_for_enums=False,
        indent=JSON_INDENT,
    )
    response_json = discoveryengine.SearchResponse.to_json(
        response,
        including_default_value_fields=True,
        use_integers_for_enums=False,
        indent=JSON_INDENT,
    )

    results = get_enterprise_search_results(response)
    summary = getattr(response.summary, "summary_text", "")
    return results, summary, request_url, request_json, response_json


def get_enterprise_search_results(
    response: discoveryengine.SearchResponse,
) -> list[dict[str, str | list]]:
    """
    Extract Results from Enterprise Search Response
    """

    ROBOT = "https://www.google.com/images/errors/robot.png"

    def get_thumbnail_image(data: dict) -> str:
        cse_thumbnail = data.get("pagemap", {}).get("cse_thumbnail")
        image_link = data.get("image", {}).get("thumbnailLink")

        if cse_thumbnail:
            return cse_thumbnail[0]["src"]
        if image_link:
            return image_link
        return ROBOT

    def get_formatted_link(data: dict) -> str:
        html_formatted_url = data.get("htmlFormattedUrl")
        image_context_link = data.get("image", {}).get("contextLink")
        link = data.get("link")
        return html_formatted_url or image_context_link or link or ROBOT

    return [
        {
            "title": result.document.derived_struct_data["title"],
            "htmlTitle": result.document.derived_struct_data.get(
                "htmlTitle", result.document.derived_struct_data["title"]
            ),
            "link": result.document.derived_struct_data["link"],
            "htmlFormattedUrl": get_formatted_link(result.document.derived_struct_data),
            "displayLink": result.document.derived_struct_data["displayLink"],
            "snippets": [
                s.get("htmlSnippet", s.get("snippet", ""))
                for s in result.document.derived_struct_data.get("snippets", [])
            ],
            "extractiveAnswers": [
                e["content"]
                for e in result.document.derived_struct_data.get(
                    "extractive_answers", []
                )
            ],
            "extractiveSegments": [
                e["content"]
                for e in result.document.derived_struct_data.get(
                    "extractive_segments", []
                )
            ],
            "thumbnailImage": get_thumbnail_image(result.document.derived_struct_data),
            "resultJson": discoveryengine.SearchResponse.SearchResult.to_json(
                result, including_default_value_fields=True, indent=JSON_INDENT
            ),
        }
        for result in response.results
    ]


def recommend_personalize(
    project_id: str,
    location: str,
    datastore_id: str,
    serving_config_id: str,
    document_id: str,
    user_pseudo_id: str | None = "xxxxxxxxxxx",
    attribution_token: str | None = None,
) -> tuple:
    # Create a client
    client = discoveryengine.RecommendationServiceClient()

    # The full resource name of the search engine serving config
    # e.g. projects/{project_id}/locations/{location}
    serving_config = client.serving_config_path(
        project=project_id,
        location=location,
        data_store=datastore_id,
        serving_config=serving_config_id,
    )

    user_event = discoveryengine.UserEvent(
        event_type="view-item",
        user_pseudo_id=user_pseudo_id,
        attribution_token=attribution_token,
        documents=[discoveryengine.DocumentInfo(id=document_id)],
    )

    request = discoveryengine.RecommendRequest(
        serving_config=serving_config,
        user_event=user_event,
        params={"returnDocument": True, "returnScore": True},
    )

    response = client.recommend(request)

    request_url = (
        f"https://discoveryengine.googleapis.com/v1beta/{serving_config}:recommend"
    )

    request_json = discoveryengine.RecommendRequest.to_json(
        request, including_default_value_fields=False, indent=JSON_INDENT
    )
    response_json = discoveryengine.RecommendResponse.to_json(
        response, including_default_value_fields=True, indent=JSON_INDENT
    )

    results = get_personalize_results(response)
    return results, response.attribution_token, request_url, request_json, response_json


def get_storage_link(uri: str) -> str:
    return uri.replace("gs://", "https://storage.googleapis.com/")


def get_personalize_results(
    response: discoveryengine.RecommendResponse,
) -> list[dict]:
    """
    Extract Results from Personalize Response
    """
    return [
        {
            "id": result.id,
            "title": basename(result.document.content.uri),
            "htmlFormattedUrl": result.document.content.uri,
            "link": get_storage_link(result.document.content.uri),
            "mimeType": result.document.content.mime_type,
            "resultJson": discoveryengine.RecommendResponse.RecommendationResult.to_json(
                result, including_default_value_fields=True, indent=JSON_INDENT
            ),
        }
        for result in response.results
    ]