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// query.rs
//
// Copyright © 2018
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.

use Configuration;
use EntityType;

/// Query for entities items and properties by ID (`wbgetentities`).
///
/// This structure holds all the parameters to query for one or many
/// Wikibase entities (items and properties).
///
/// # API Documentation
///
/// https://www.wikidata.org/w/api.php?action=help&modules=wbgetentities
///
/// # Example
///
/// ```
/// let query = wikibase::query::EntityQuery::new(vec!["Q19660".to_string(), "P190".to_string()], "es");
/// ```
#[derive(Debug)]
pub struct EntityQuery {
    ids: Vec<String>,
    lang: String,
}

/// Maps to the wbgetentities Mediawiki API
///
/// # API Documentation
///
/// https://www.wikidata.org/w/api.php?action=help&modules=wbsearchentities
///
/// # Example
///
/// ```
/// let query = wikibase::query::SearchQuery::new("Minsk", "be", "be", 10, wikibase::EntityType::Property);
/// ```
#[derive(Debug)]
pub struct SearchQuery {
    query: String,
    lang: String,
    search_lang: String,
    limit: u64,
    entity_type: EntityType,
}

impl EntityQuery {
    pub fn new<S: Into<String>>(ids: Vec<String>, lang: S) -> EntityQuery {
        Self {
            ids,
            lang: lang.into(),
        }
    }

    pub fn ids(&self) -> &[String] {
        &self.ids
    }

    pub fn lang(&self) -> &str {
        &self.lang
    }

    pub fn url(&self, configuration: &Configuration) -> String {
        encode_url(&format!("{}?action=wbgetentities&ids={}&languages={}&uselang={}&format=json",
            configuration.api_url(),
            self.ids_piped(),
            &self.lang,
            &self.lang))
    }

    fn ids_piped(&self) -> String {
        self.ids().join("|")
    }
}

impl SearchQuery {
    pub fn new<S: Into<String>>(query: S, lang: S, search_lang: S, limit: u64,
        entity_type: EntityType) -> SearchQuery {
        Self {
            query: query.into(),
            lang: lang.into(),
            search_lang: search_lang.into(),
            limit,
            entity_type,
        }
    }

    pub fn entity_type(&self) -> &EntityType {
        &self.entity_type
    }

    pub fn lang(&self) -> &str {
        &self.lang
    }

    pub fn limit(&self) -> &u64 {
        &self.limit
    }

    pub fn query(&self) -> &str {
        &self.query
    }

    pub fn search_lang(&self) -> &str {
        &self.search_lang
    }

    pub fn url(&self, configuration: &Configuration) -> String {
        encode_url(&format!("{}?action=wbsearchentities&search={}&language={}&limit={}&type={}&uselang={}&format=json",
            configuration.api_url(),
            &self.query,
            &self.search_lang,
            &self.limit,
            &self.entity_type.string_value(),
            &self.lang))
    }
}

/// Encodes the URL for a request
///
/// Only replaces various special characters to make the request work.
/// Replaces:
/// " " (space) -> "%20"
fn encode_url(url: &str) -> String {
    str::replace(&url, " ", "%20")
}