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use crate::{
    methods::Method,
    request::RequestBuilder,
    types::{InlineQueryResult, Integer},
};
use failure::Error;
use serde::Serialize;

/// Use this method to send answers to an inline query
///
/// No more than 50 results per query are allowed
#[derive(Clone, Debug, Serialize)]
pub struct AnswerInlineQuery {
    inline_query_id: String,
    results: Vec<InlineQueryResult>,
    #[serde(skip_serializing_if = "Option::is_none")]
    cache_time: Option<Integer>,
    #[serde(skip_serializing_if = "Option::is_none")]
    is_personal: Option<bool>,
    #[serde(skip_serializing_if = "Option::is_none")]
    next_offset: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    switch_pm_text: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    switch_pm_parameter: Option<String>,
}

impl AnswerInlineQuery {
    /// Creates a new AnswerInlineQuery with empty optional parameters
    ///
    /// # Arguments
    ///
    /// * inline_query_id - Unique identifier for the answered query
    /// * results - An array of results for the inline query
    pub fn new<S: Into<String>>(inline_query_id: S, results: Vec<InlineQueryResult>) -> Self {
        AnswerInlineQuery {
            inline_query_id: inline_query_id.into(),
            results,
            cache_time: None,
            is_personal: None,
            next_offset: None,
            switch_pm_text: None,
            switch_pm_parameter: None,
        }
    }

    /// Maximum amount of time in seconds that the result of the inline query may be cached on the server
    ///
    /// Defaults to 300
    pub fn cache_time(mut self, cache_time: Integer) -> Self {
        self.cache_time = Some(cache_time);
        self
    }

    /// Cache results on the server side only for the user that sent the query
    ///
    /// By default, results may be returned to any user who sends the same query
    pub fn personal(mut self, is_personal: bool) -> Self {
        self.is_personal = Some(is_personal);
        self
    }

    /// Offset that a clien should send in the next query with the same text to receive more results
    ///
    /// Pass an empty string if there are no more results or if you don‘t support pagination
    /// Offset length can’t exceed 64 bytes
    pub fn next_offset<S: Into<String>>(mut self, next_offset: S) -> Self {
        self.next_offset = Some(next_offset.into());
        self
    }

    /// Clients will display a button with specified text that switches the user
    /// to a private chat with the bot and sends the bot a
    /// start message with the parameter switch_pm_parameter
    pub fn switch_pm_text<S: Into<String>>(mut self, switch_pm_text: S) -> Self {
        self.switch_pm_text = Some(switch_pm_text.into());
        self
    }

    /// Deep-linking parameter for the /start message sent to the bot when user presses the switch button
    ///
    /// 1-64 characters, only A-Z, a-z, 0-9, _ and - are allowed
    ///
    /// Example: An inline bot that sends YouTube videos can ask the user to connect the bot to
    /// their YouTube account to adapt search results accordingly
    /// To do this, it displays a ‘Connect your YouTube account’
    /// button above the results, or even before showing any
    /// The user presses the button, switches to a private chat with the bot and, in doing so,
    /// passes a start parameter that instructs the bot to return an oauth link
    /// Once done, the bot can offer a switch_inline button so that the user can easily
    /// return to the chat where they wanted to use the bot's inline capabilities
    pub fn switch_pm_parameter<S: Into<String>>(mut self, switch_pm_parameter: S) -> Self {
        self.switch_pm_parameter = Some(switch_pm_parameter.into());
        self
    }
}

impl Method for AnswerInlineQuery {
    type Response = bool;

    fn into_request(self) -> Result<RequestBuilder, Error> {
        RequestBuilder::json("answerInlineQuery", &self)
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::request::{RequestBody, RequestMethod};
    use serde_json::Value;

    #[test]
    fn answer_inline_query() {
        let request = AnswerInlineQuery::new("id", vec![])
            .cache_time(300)
            .personal(true)
            .next_offset("offset")
            .switch_pm_text("text")
            .switch_pm_parameter("param")
            .into_request()
            .unwrap()
            .build("base-url", "token");
        assert_eq!(request.method, RequestMethod::Post);
        assert_eq!(request.url, "base-url/bottoken/answerInlineQuery");
        if let RequestBody::Json(data) = request.body {
            let data: Value = serde_json::from_slice(&data).unwrap();
            assert_eq!(data["inline_query_id"], "id");
            assert_eq!(data["cache_time"], 300);
            assert_eq!(data["is_personal"], true);
            assert_eq!(data["next_offset"], "offset");
            assert_eq!(data["switch_pm_text"], "text");
            assert_eq!(data["switch_pm_parameter"], "param");
        } else {
            panic!("Unexpected request body: {:?}", request.body);
        }
    }
}