use crate::search::*;
use crate::util::*;
use serde::ser::{Serialize, SerializeStruct, Serializer};

/// Returns documents that match a provided text, number, date or boolean value.
/// The provided text is analyzed before matching.
///
/// The `match` query is the standard query for performing a full-text search,
/// including options for fuzzy matching.
///
/// To create a Match query:
/// ```
/// # use elasticsearch_dsl::queries::*;
/// # use elasticsearch_dsl::queries::params::*;
/// # let query =
/// Query::r#match("test", "search text")
///     .boost(2)
///     .name("test");
/// ```
/// <https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-match-query.html>
#[derive(Debug, Clone, PartialEq)]
pub struct MatchQuery {
    field: String,
    inner: Inner,
}

#[derive(Debug, Clone, PartialEq, Serialize)]
struct Inner {
    query: String,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    analyzer: Option<String>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    auto_generate_synonyms_phrase_query: Option<bool>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    fuzziness: Option<Fuzziness>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    max_expansions: Option<u8>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    prefix_length: Option<u8>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    fuzzy_transpositions: Option<bool>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    fuzzy_rewrite: Option<Rewrite>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    lenient: Option<bool>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    operator: Option<Operator>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    minimum_should_match: Option<MinimumShouldMatch>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    zero_terms_query: Option<ZeroTermsQuery>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    boost: Option<Boost>,

    #[serde(skip_serializing_if = "ShouldSkip::should_skip")]
    _name: Option<String>,
}

impl Query {
    /// Creates an instance of [`MatchQuery`]
    ///
    /// - `field` - Field you wish to search.
    /// - `query` - Text, number, boolean value or date you wish to find in the provided
    /// `<field>`.<br>
    /// The `match` query
    /// [analyzes](https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis.html)
    /// any provided text before performing a search. This means the `match`
    /// query can search
    /// [`text`](https://www.elastic.co/guide/en/elasticsearch/reference/current/text.html)
    /// fields for analyzed tokens rather than an exact term.
    pub fn r#match(field: impl Into<String>, query: impl Into<String>) -> MatchQuery {
        MatchQuery {
            field: field.into(),
            inner: Inner {
                query: query.into(),
                analyzer: None,
                auto_generate_synonyms_phrase_query: None,
                fuzziness: None,
                max_expansions: None,
                prefix_length: None,
                fuzzy_transpositions: None,
                fuzzy_rewrite: None,
                lenient: None,
                operator: None,
                minimum_should_match: None,
                zero_terms_query: None,
                boost: None,
                _name: None,
            },
        }
    }
}

impl MatchQuery {
    /// [Analyzer](https://www.elastic.co/guide/en/elasticsearch/reference/current/analysis.html)
    /// used to convert the text in the `query` value into tokens. Defaults to the
    /// [index-time analyzer](https://www.elastic.co/guide/en/elasticsearch/reference/current/specify-analyzer.html#specify-index-time-analyzer)
    /// mapped for the `<field>`. If no analyzer is mapped, the index’s default analyzer is used.
    pub fn analyzer(mut self, analyzer: impl Into<String>) -> Self {
        self.inner.analyzer = Some(analyzer.into());
        self
    }

    /// If `true`,
    /// [match phrase](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-match-query-phrase.html)
    /// queries are automatically created for multi-term synonyms. Defaults to `true`.
    ///
    /// See [Use synonyms with match query](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-match-query.html#query-dsl-match-query-synonyms)
    /// for an example.
    pub fn auto_generate_synonyms_phrase_query(
        mut self,
        auto_generate_synonyms_phrase_query: bool,
    ) -> Self {
        self.inner.auto_generate_synonyms_phrase_query = Some(auto_generate_synonyms_phrase_query);
        self
    }

    /// Maximum edit distance allowed for matching.
    /// See [Fuzziness](Fuzziness)
    /// for valid values and more information. See
    /// [Fuzziness in the match query](https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-match-query.html#query-dsl-match-query-fuzziness)
    /// for an example.
    pub fn fuzziness(mut self, fuzziness: impl Into<Fuzziness>) -> Self {
        self.inner.fuzziness = Some(fuzziness.into());
        self
    }

    /// Maximum number of terms to which the query will expand.
    /// Defaults to `50`.
    pub fn max_expansions(mut self, max_expansions: u8) -> Self {
        self.inner.max_expansions = Some(max_expansions);
        self
    }

    /// Number of beginning characters left unchanged for fuzzy matching.
    /// Defaults to `0`.
    pub fn prefix_length(mut self, prefix_length: u8) -> Self {
        self.inner.prefix_length = Some(prefix_length);
        self
    }

    /// If `true`, edits for fuzzy matching include transpositions of two
    /// adjacent characters (ab → ba). Defaults to `true`.
    pub fn fuzzy_transpositions(mut self, fuzzy_transpositions: bool) -> Self {
        self.inner.fuzzy_transpositions = Some(fuzzy_transpositions);
        self
    }

    /// Method used to rewrite the query. See the
    /// [`rewrite` parameter](Rewrite) for valid values and
    /// more information.
    ///
    /// If the `fuzziness` parameter is not `0`, the match query uses a
    /// `fuzzy_rewrite` method of `top_terms_blended_freqs_${max_expansions}`
    /// by default.
    pub fn fuzzy_rewrite(mut self, fuzzy_rewrite: Rewrite) -> Self {
        self.inner.fuzzy_rewrite = Some(fuzzy_rewrite);
        self
    }

    /// If `true`, format-based errors, such as providing a text `query`
    /// value for a
    /// [numeric](https://www.elastic.co/guide/en/elasticsearch/reference/current/number.html)
    /// field, are ignored. Defaults to `false`.
    pub fn lenient(mut self, lenient: bool) -> Self {
        self.inner.lenient = Some(lenient);
        self
    }

    /// Boolean logic used to interpret text in the `query` value
    pub fn operator(mut self, operator: Operator) -> Self {
        self.inner.operator = Some(operator);
        self
    }

    /// Minimum number of clauses that must match for a document to be returned.
    /// See the
    /// [`minimum_should_match` parameter](MinimumShouldMatch)
    /// for valid values and more information.
    pub fn minimum_should_match(
        mut self,
        minimum_should_match: impl Into<MinimumShouldMatch>,
    ) -> Self {
        self.inner.minimum_should_match = Some(minimum_should_match.into());
        self
    }

    /// Indicates whether no documents are returned if the `analyzer` removes
    /// all tokens, such as when using a `stop` filter.
    pub fn zero_terms_query(mut self, zero_terms_query: ZeroTermsQuery) -> Self {
        self.inner.zero_terms_query = Some(zero_terms_query);
        self
    }

    add_boost_and_name!();
}

impl ShouldSkip for MatchQuery {
    fn should_skip(&self) -> bool {
        self.inner.query.should_skip()
    }
}

impl Serialize for MatchQuery {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        let mut hash = std::collections::HashMap::new();
        let _ = hash.insert(&self.field, &self.inner);

        let mut map = serializer.serialize_struct("MatchQuery", 1)?;
        map.serialize_field("match", &hash)?;
        map.end()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    test_serialization! {
        with_required_fields(
            Query::r#match("test", "search text"),
            json!({
                "match": {
                    "test": {
                        "query": "search text"
                    }
                }
            })
        );

        with_all_fields(
            Query::r#match("test", "search text")
                .analyzer("search_time_analyzer")
                .auto_generate_synonyms_phrase_query(true)
                .fuzziness(23)
                .max_expansions(2)
                .prefix_length(3)
                .fuzzy_transpositions(false)
                .fuzzy_rewrite(Rewrite::ConstantScoreBoolean)
                .lenient(true)
                .operator(Operator::And)
                .minimum_should_match("22")
                .zero_terms_query(ZeroTermsQuery::None)
                .boost(2)
                .name("test"),
            json!({
                "match": {
                    "test": {
                        "query": "search text",
                        "analyzer": "search_time_analyzer",
                        "auto_generate_synonyms_phrase_query": true,
                        "fuzziness": 23,
                        "max_expansions": 2,
                        "prefix_length": 3,
                        "fuzzy_transpositions": false,
                        "fuzzy_rewrite": "constant_score_boolean",
                        "lenient": true,
                        "operator": "AND",
                        "minimum_should_match": "22",
                        "zero_terms_query": "none",
                        "boost": 2,
                        "_name": "test"
                    }
                }
            })
        );
    }
}