use crate::v1::{Client, error, BASE_URL, standard};

use serde::{Deserialize, Serialize};

// ----------------- Response Objects -----------------

#[derive(Deserialize, Debug)]
pub struct ListWebhooksResponse {
    /// The list of webhooks returned in this response.
    pub data: Vec<WebhookResource>,
    pub links: ResponseLinks,
}

#[derive(Deserialize, Debug)]
pub struct GetWebhookResponse {
    /// The webhook returned in the response.
    pub data: WebhookResource,
}

#[derive(Deserialize, Debug)]
pub struct CreateWebhookResponse {
    /// The webhook that was created.
    pub data: WebhookResource,
}

#[derive(Deserialize, Debug)]
pub struct WebhookResource {
    /// The type of this resource: `webhooks`
    pub r#type: String,
    /// The unique identifier for this webhook.
    pub id: String,
    pub attributes: Attributes,
    pub relationships: Relationships,
    pub links: WebhookResourceLinks,
}

#[derive(Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
pub struct Attributes {
    /// The URL that this webhook is configured to `POST` events to.
    pub url: String,
    /// An optional description that was provided at the time the webhook was
    /// created.
    pub description: Option<String>,
    /// A shared secret key used to sign all webhook events sent to the
    /// configured webhook URL. This field is returned only once, upon the
    /// initial creation of the webhook. If lost, create a new webhook and
    /// delete this webhook.
    /// 
    /// The webhook URL receives a request with a `X-Up-Authenticity-Signature`
    /// header, which is the SHA-256 HMAC of the entire raw request body signed
    /// using this `secretKey`. It is advised to compute and check this
    /// signature to verify the authenticity of requests sent to the webhook
    /// URL. See Handling webhook events for full details.
    pub secret_key: Option<String>,
    /// The date-time at which this webhook was created.
    pub created_at: String,
}

#[derive(Deserialize, Debug)]
pub struct Relationships {
    pub logs: Logs,
}

#[derive(Deserialize, Debug)]
pub struct Logs {
    pub links: Option<LogsLinks>,
}

#[derive(Deserialize, Debug)]
pub struct LogsLinks {
    /// The link to retrieve the related resource(s) in this relationship.
    pub related: String,
}

#[derive(Deserialize, Debug)]
pub struct WebhookResourceLinks {
    /// The canonical link to this resource within the API.
    #[serde(rename = "self")]
    pub this: String,
}

#[derive(Deserialize, Debug)]
pub struct ResponseLinks {
    /// The link to the previous page in the results. If this value is `None`
    /// there is no previous page.
    pub prev: Option<String>,
    /// The link to the next page in the results. If this value is `None` there
    /// is no next page.
    pub next: Option<String>,
}

#[derive(Deserialize, Debug)]
pub struct PingWebhookResponse {
    /// The webhook event data sent to the subscribed webhook.
    pub data: WebhookEventResource,
}

#[derive(Deserialize, Debug)]
pub struct WebhookEventResource {
    /// The type of this resource: `webhook-events`
    pub r#type: String,
    /// The unique identifier for this event. This will remain constant across
    /// delivery retries.
    pub id: String,
    pub attributes: EventAttributes,
    pub relationships: EventRelationships,
}

#[derive(Deserialize, Debug)]
pub struct EventRelationships {
    pub webhook: Webhook,
    pub transaction: Option<Transaction>,
}

#[derive(Deserialize, Debug)]
pub struct Transaction {
    pub data: TransactionData,
    pub links: Option<TransactionLinks>,
}

#[derive(Deserialize, Debug)]
pub struct Webhook {
    pub data: WebhookData,
    pub links: Option<WebhookLinks>,
}

#[derive(Deserialize, Debug)]
pub struct WebhookData {
    /// The type of this resource: `webhooks`
    pub r#type: String,
    /// The unique identifier of the resource within its type.
    pub id: String,
}

#[derive(Deserialize, Debug)]
pub struct WebhookLinks {
    /// The link to retrieve the related resource(s) in this relationship.
    pub related: String,
}

#[derive(Deserialize, Debug)]
pub struct TransactionData {
    /// The type of this resource: `transactions`
    pub r#type: String,
    /// The unique identifier of the resource within its type.
    pub id: String,
}

#[derive(Deserialize, Debug)]
pub struct TransactionLinks {
    /// The link to retrieve the related resource(s) in this relationship.
    pub related: String,
}

#[derive(Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
pub struct EventAttributes {
    /// The type of this event. This can be used to determine what action to
    /// take in response to the event.
    pub event_type: standard::WebhookEventTypeEnum,
    /// The date-time at which this event was generated.
    pub created_at: String,
}


#[derive(Deserialize, Debug)]
pub struct ListWebhookLogsResponse {
    /// The list of delivery logs returned in this response.
    pub data: Vec<WebhookDeliveryLogResource>,
    pub links: LogsResponseLinks,
}

#[derive(Deserialize, Debug)]
pub struct WebhookDeliveryLogResource {
    /// The type of this resource: `webhook-delivery-logs`
    pub r#type: String,
    /// The unique identifier for this log entry.
    pub id: String,
    pub attributes: DeliveryLogAttributes,
    pub relationships: DeliveryLogRelationships,
}

#[derive(Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
pub struct DeliveryLogRelationships {
    pub webhook_event: WebhookEvent,
}

#[derive(Deserialize, Debug)]
pub struct WebhookEvent {
    pub data: WebhookEventData
}

#[derive(Deserialize, Debug)]
pub struct WebhookEventData {
    /// The type of this resource: `webhook-events`
    pub r#type: String,
    /// The unique identifier of the resource within its type.
    pub id: String,
}

#[derive(Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
pub struct DeliveryLogAttributes {
    /// Information about the request that was sent to the webhook URL.
    pub request: Request,
    /// Information about the response that was received from the webhook URL.
    pub response: Option<Response>,
    /// The success or failure status of this delivery attempt.
    pub delivery_status: standard::WebhookDeliveryStatusEnum,
    /// The date-time at which this log entry was created.
    pub created_at: String,
}

#[derive(Deserialize, Debug)]
pub struct Request {
    /// The payload that was sent in the request body.
    pub body: String,
}

#[derive(Deserialize, Debug)]
#[serde(rename_all = "camelCase")]
pub struct Response {
    /// The HTTP status code received in the response.
    pub status_code: i64,
    /// The payload that was received in the response body.
    pub body: String,
}

#[derive(Deserialize, Debug)]
pub struct LogsResponseLinks {
    /// The link to the previous page in the results. If this value is `None`
    /// there is no previous page.
    pub prev: Option<String>,
    /// The link to the next page in the results. If this value is `None` there
    /// is no next page.
    pub next: Option<String>,
}


// ----------------- Input Objects -----------------

#[derive(Default)]
pub struct ListWebhooksOptions {
    /// The number of records to return in each page. 
    page_size: Option<u8>,
}

impl ListWebhooksOptions {
    /// Sets the page size.
    pub fn page_size(&mut self, value: u8) {
        self.page_size = Some(value);
    }

    fn add_params(&self, url: &mut reqwest::Url) {
        let mut query = String::new();

        if let Some(value) = &self.page_size {
            if !query.is_empty() {
                query.push('&');
            }
            query.push_str(&format!("page[size]={}", value));
        }

        if !query.is_empty() {
            url.set_query(Some(&query));
        }
    }
}

#[derive(Default)]
pub struct ListWebhookLogsOptions {
    /// The number of records to return in each page. 
    page_size: Option<u8>,
}

impl ListWebhookLogsOptions {
    /// Sets the page size.
    pub fn page_size(&mut self, value: u8) {
        self.page_size = Some(value);
    }

    fn add_params(&self, url: &mut reqwest::Url) {
        let mut query = String::new();

        if let Some(value) = &self.page_size {
            if !query.is_empty() {
                query.push('&');
            }
            query.push_str(&format!("page[size]={}", value));
        }

        if !query.is_empty() {
            url.set_query(Some(&query));
        }
    }
}

// ----------------- Request Objects -----------------

#[derive(Serialize)]
pub struct CreateWebhookRequest {
    /// The webhook resource to create.
    pub data: WebhookInputResource,
}

#[derive(Serialize)]
pub struct WebhookInputResource {
    pub attributes: InputAttributes,
}

#[derive(Serialize)]
pub struct InputAttributes {
    /// The URL that this webhook should post events to. This must be a valid
    /// HTTP or HTTPS URL that does not exceed 300 characters in length.
    pub url: String,
    /// An optional description for this webhook, up to 64 characters in length.
    pub description: Option<String>,
}

impl Client {
    /// Retrieve a list of configured webhooks. The returned list is paginated
    /// and can be scrolled by following the `next` and `prev` links where
    /// present. Results are ordered oldest first to newest last.
    pub async fn list_webhooks(
        &self,
        options: &ListWebhooksOptions,
    ) -> Result<ListWebhooksResponse, error::Error> {
        let mut url = reqwest::Url::parse(
            &format!("{}/webhooks", BASE_URL)
        ).map_err(error::Error::UrlParse)?;
        options.add_params(&mut url);

        let res = reqwest::Client::new()
            .get(url)
            .header("Authorization", self.auth_header())
            .send()
            .await
            .map_err(error::Error::Request)?;

        match res.status() {
            reqwest::StatusCode::OK => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let webhook_response: ListWebhooksResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Ok(webhook_response)
            },
            _ => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let error: error::ErrorResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Err(error::Error::Api(error))
            }
        }
    }

    /// Retrieve a specific webhook by providing its unique identifier.
    pub async fn get_webhook(
        &self,
        id: &str,
    ) -> Result<GetWebhookResponse, error::Error> {
        // This assertion is because without an ID the request is thought to be
        // a request for many webhooks, and therefore the error messages are
        // very unclear.
        if id.is_empty() {
            panic!("The provided webhook ID must not be empty.");
        }

        let url = reqwest::Url::parse(
            &format!("{}/webhooks/{}", BASE_URL, id)
        ).map_err(error::Error::UrlParse)?;

        let res = reqwest::Client::new()
            .get(url)
            .header("Authorization", self.auth_header())
            .send()
            .await
            .map_err(error::Error::Request)?;

        match res.status() {
            reqwest::StatusCode::OK => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let webhook_response: GetWebhookResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Ok(webhook_response)
            },
            _ => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let error: error::ErrorResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Err(error::Error::Api(error))
            }
        }
    }

    /// Create a new webhook with a given URL. The URL will receive webhook
    /// events as JSON-encoded `POST` requests. The URL must respond with a
    /// HTTP `200` status on success.
    ///
    /// There is currently a limit of 10 webhooks at any given time. Once this
    /// limit is reached, existing webhooks will need to be deleted before new
    /// webhooks can be created.
    /// 
    /// Event delivery is retried with exponential backoff if the URL is
    /// unreachable or it does not respond with a `200` status. The response
    /// includes a `secretKey` attribute, which is used to sign requests sent
    /// to the webhook URL. It will not be returned from any other endpoints
    /// within the Up API. If the `secretKey` is lost, simply create a new
    /// webhook with the same URL, capture its `secretKey` and then delete the
    /// original webhook. See Handling webhook events for details on how to
    /// process webhook events.
    /// 
    /// It is probably a good idea to test the webhook by sending it a `PING`
    /// event after creating it.
    pub async fn create_webhook(
        &self,
        webhook_url: &str,
        description: Option<String>,
    ) -> Result<CreateWebhookResponse, error::Error> {
        let url = reqwest::Url::parse(
            &format!("{}/webhooks", BASE_URL)
        ).map_err(error::Error::UrlParse)?;

        let body = CreateWebhookRequest {
            data: WebhookInputResource {
                attributes: InputAttributes {
                    url: String::from(webhook_url),
                    description,
                }
            }
        };

        let body =
            serde_json::to_string(&body)
            .map_err(error::Error::Serialize)?;

        let res = reqwest::Client::new()
            .post(url)
            .header("Authorization", self.auth_header())
            .header("Content-Type", "application/json")
            .body(body)
            .send()
            .await
            .map_err(error::Error::Request)?;

        match res.status() {
            reqwest::StatusCode::CREATED => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let webhook_response: CreateWebhookResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Ok(webhook_response)
            },
            _ => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let error: error::ErrorResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Err(error::Error::Api(error))
            }
        }
    }

    /// Delete a specific webhook by providing its unique identifier. Once
    /// deleted, webhook events will no longer be sent to the configured URL.
    pub async fn delete_webhook(&self, id: &str) -> Result<(), error::Error> {
        let url = reqwest::Url::parse(
            &format!("{}/webhooks/{}", BASE_URL, id)
        ).map_err(error::Error::UrlParse)?;

        let res = reqwest::Client::new()
            .delete(url)
            .header("Authorization", self.auth_header())
            .send()
            .await
            .map_err(error::Error::Request)?;

        match res.status() {
            reqwest::StatusCode::NO_CONTENT => {
                Ok(())
            },
            _ => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let error: error::ErrorResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Err(error::Error::Api(error))
            }
        }
    }

    /// Send a `PING` event to a webhook by providing its unique identifier.
    /// This is useful for testing and debugging purposes. The event is
    /// delivered asynchronously and its data is returned in the response to
    /// this request.
    pub async fn ping_webhook(
        &self,
        id: &str,
    ) -> Result<PingWebhookResponse, error::Error> {
        let url = reqwest::Url::parse(
            &format!("{}/webhooks/{}/ping", BASE_URL, id)
        ).map_err(error::Error::UrlParse)?;

        let res = reqwest::Client::new()
            .post(url)
            .header("Authorization", self.auth_header())
            .header("Content-Type", "application/json")
            .header("Content-Length", "0")
            .send()
            .await
            .map_err(error::Error::Request)?;

        match res.status() {
            reqwest::StatusCode::CREATED => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let webhook_response: PingWebhookResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Ok(webhook_response)
            },
            _ => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let error: error::ErrorResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Err(error::Error::Api(error))
            }
        }
    }

    /// Retrieve a list of delivery logs for a webhook by providing its unique
    /// identifier. This is useful for analysis and debugging purposes. The
    /// returned list is paginated and can be scrolled by following the `next`
    /// and `prev` links where present. Results are ordered newest first to
    /// oldest last. Logs may be automatically purged after a period of time.
    pub async fn list_webhook_logs(
        &self,
        id: &str,
        options: &ListWebhookLogsOptions,
    ) -> Result<ListWebhookLogsResponse, error::Error> {
        let mut url = reqwest::Url::parse(
            &format!("{}/webhooks/{}/logs", BASE_URL, id)
        ).map_err(error::Error::UrlParse)?;
        options.add_params(&mut url);

        let res = reqwest::Client::new()
            .get(url)
            .header("Authorization", self.auth_header())
            .send()
            .await
            .map_err(error::Error::Request)?;

        match res.status() {
            reqwest::StatusCode::OK => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let webhook_response: ListWebhookLogsResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Ok(webhook_response)
            },
            _ => {
                let body =
                    res.text()
                    .await
                    .map_err(error::Error::BodyRead)?;
                let error: error::ErrorResponse =
                    serde_json::from_str(&body)
                    .map_err(error::Error::Json)?;

                Err(error::Error::Api(error))
            }
        }
    }
}

// ----------------- Page Navigation -----------------

implement_pagination_v1!(ListWebhooksResponse);