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use std::collections::HashMap;

use serde_json::from_str;

use crate::ZeroBounce;
use crate::utility::{ZBResult, ZBError};
use crate::utility::{CONTENT_TYPE_JSON, CONTENT_TYPE_STREAM};
use crate::utility::{ENDPOINT_FILE_SEND, ENDPOINT_FILE_STATUS, ENDPOINT_FILE_RESULT, ENDPOINT_FILE_DELETE};
use crate::utility::{ENDPOINT_SCORING_DELETE, ENDPOINT_SCORING_STATUS, ENDPOINT_SCORING_RESULT, ENDPOINT_SCORING_SEND};
use crate::utility::structures::bulk::{ZBBulkResponse, ZBFile, ZBFileFeedback, ZBFileStatus};


impl ZeroBounce {

    fn generic_file_submit(&self, endpoint: &str, zb_file: &ZBFile) -> ZBResult<ZBFileFeedback> {
        let multi_part_form = zb_file.generate_multipart()?
            .text("api_key", self.api_key.clone());

        let url = self.url_provider.bulk_url_of(endpoint);
        let response = self.client.post(url)
            .multipart(multi_part_form)
            .send()?;

        let response_ok = response.status().is_success();
        let response_content = response.text()?;
        if !response_ok {
            return Err(ZBError::ExplicitError(response_content));
        }

        let feedback_object = from_str::<ZBFileFeedback>(&response_content)?;
        Ok(feedback_object)
    }

    fn generic_file_status_check(&self, endpoint: &str, file_id: &str) -> ZBResult<ZBFileStatus> {
        let query_args = HashMap::from([
            ("api_key", self.api_key.as_str()),
            ("file_id", file_id),
        ]);

        let response_content = self.generic_get_request(
            self.url_provider.bulk_url_of(endpoint), query_args
        )?;

        let file_status = from_str::<ZBFileStatus>(&response_content)?;
        Ok(file_status)
    }

    fn generic_result_fetch(&self, endpoint: &str, file_id: &str) -> ZBResult<ZBBulkResponse> {
        let query_args = HashMap::from([
            ("api_key", self.api_key.as_str()),
            ("file_id", file_id),
        ]);

        let url = &self.url_provider.bulk_url_of(endpoint);
        let response = self.client
            .get(url)
            .query(&query_args)
            .send()?;

        // check if the response is a file, based on the content type
        let content_type = response
            .headers()
            .get("Content-Type")
            .ok_or(ZBError::explicit("content type not specified in response"))?
            .to_str()
            .map_err(|error| ZBError::ExplicitError(error.to_string()))?
            .to_string();

        let status_amount = response.status().as_u16();
        if !response.status().is_success() {
            let response_content = response.text()?;
            return Err(ZBError::ExplicitError(response_content))
        }

        if content_type == CONTENT_TYPE_STREAM {
            let content = response.bytes()?;
            return Ok(ZBBulkResponse::Content(content));
        }

        let response_content = response.text()?;
        if content_type == CONTENT_TYPE_JSON {
            let feedback = from_str::<ZBFileFeedback>(&response_content);
            if feedback.is_ok() {
                return Ok(ZBBulkResponse::Feedback(feedback.unwrap()));
            }
        }

        // content was not the expected one
        let error_ = format!(
            "Status: {}. Content-type: {}. Response content: {}",
            status_amount,
            content_type,
            response_content,
        );
        Err(ZBError::ExplicitError(error_))
    }

    fn generic_result_delete(&self, endpoint: &str, file_id: &str) -> ZBResult<ZBFileFeedback>{
        let query_args = HashMap::from([
            ("api_key", self.api_key.as_str()),
            ("file_id", file_id),
        ]);

        let response_content = self.generic_get_request(
            self.url_provider.bulk_url_of(endpoint), query_args
        )?;

        let file_status = from_str::<ZBFileFeedback>(&response_content)?;
        Ok(file_status)
    }

    pub fn bulk_validation_file_submit(&self, zb_file: &ZBFile) -> ZBResult<ZBFileFeedback> {
        self.generic_file_submit(ENDPOINT_FILE_SEND, zb_file)
    }

    pub fn bulk_validation_file_status_check(&self, file_id: &str) -> ZBResult<ZBFileStatus> {
        self.generic_file_status_check(ENDPOINT_FILE_STATUS, file_id)
    }

    pub fn bulk_validation_result_fetch(&self, file_id: &str) -> ZBResult<ZBBulkResponse> {
        self.generic_result_fetch(ENDPOINT_FILE_RESULT, file_id)
    }

    pub fn bulk_validation_result_delete(&self, file_id: &str) -> ZBResult<ZBFileFeedback> {
        self.generic_result_delete(ENDPOINT_FILE_DELETE, file_id)
    }

    pub fn ai_scoring_file_submit(&self, zb_file: &ZBFile) -> ZBResult<ZBFileFeedback> {
        self.generic_file_submit(ENDPOINT_SCORING_SEND, zb_file)
    }

    pub fn ai_scoring_file_status_check(&self, file_id: &str) -> ZBResult<ZBFileStatus> {
        self.generic_file_status_check(ENDPOINT_SCORING_STATUS, file_id)
    }

    pub fn ai_scoring_result_fetch(&self, file_id: &str) -> ZBResult<ZBBulkResponse> {
        self.generic_result_fetch(ENDPOINT_SCORING_RESULT, file_id)
    }

    pub fn ai_scoring_result_delete(&self, file_id: &str) -> ZBResult<ZBFileFeedback> {
        self.generic_result_delete(ENDPOINT_SCORING_DELETE, file_id)
    }


}