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use crate::bucket::Bucket;
use crate::prelude::*;
use postgres_types::ToSql;

pub struct UpdateBuilder {
    with_queries: Vec<(String, String)>,
    table: String,
    fields: Vec<String>,
    conditions: Vec<String>,
    params: Bucket,
}

impl UpdateBuilder {
    /// Create a new update builder for a given table
    ///
    /// # Examples
    ///
    /// ```
    /// use postgres_querybuilder::UpdateBuilder;
    /// use postgres_querybuilder::prelude::{QueryBuilder, QueryBuilderWithSet, QueryBuilderWithWhere};
    ///
    /// let user_password = "password".to_string();
    /// let mut builder = UpdateBuilder::new("users");
    /// builder.set("username", "rick".to_string());
    /// builder.where_eq("id", 42);
    ///
    /// assert_eq!(builder.get_query(), "UPDATE users SET username = $1 WHERE id = $2");
    /// ```
    pub fn new(from: &str) -> Self {
        UpdateBuilder {
            with_queries: vec![],
            table: from.into(),
            fields: vec![],
            conditions: vec![],
            params: Bucket::new(),
        }
    }
}

impl UpdateBuilder {
    fn with_queries_to_query(&self) -> Option<String> {
        if self.with_queries.len() > 0 {
            let result: Vec<String> = self
                .with_queries
                .iter()
                .map(|item| format!("{} AS ({})", item.0, item.1))
                .collect();
            Some(format!("WITH {}", result.join(", ")))
        } else {
            None
        }
    }

    fn from_to_query(&self) -> String {
        format!("UPDATE {}", self.table)
    }

    fn set_to_query(&self) -> Option<String> {
        if self.fields.len() > 0 {
            let fields_query = self.fields.join(", ");
            Some(format!("SET {}", fields_query))
        } else {
            None
        }
    }

    fn where_to_query(&self) -> Option<String> {
        if self.conditions.len() > 0 {
            let where_query = self.conditions.join(" AND ");
            Some(format!("WHERE {}", where_query))
        } else {
            None
        }
    }
}

impl QueryBuilder for UpdateBuilder {
    fn add_param<T: 'static + ToSql + Sync + Clone>(&mut self, value: T) -> usize {
        self.params.push(value)
    }

    fn get_query(&self) -> String {
        let mut result: Vec<String> = vec![];
        match self.with_queries_to_query() {
            Some(value) => result.push(value),
            None => (),
        };
        result.push(self.from_to_query());
        match self.set_to_query() {
            Some(value) => result.push(value),
            None => (),
        };
        match self.where_to_query() {
            Some(value) => result.push(value),
            None => (),
        };
        result.join(" ")
    }

    fn get_ref_params(self) -> Vec<&'static (dyn ToSql + Sync)> {
        self.params.get_refs()
    }
}

impl QueryBuilderWithWhere for UpdateBuilder {
    fn where_condition(&mut self, raw: &str) -> &mut Self {
        self.conditions.push(raw.to_string());
        self
    }
}

impl QueryBuilderWithSet for UpdateBuilder {
    fn set<T: 'static + ToSql + Sync + Clone>(&mut self, field: &str, value: T) -> &mut Self {
        let index = self.params.push(value);
        self.fields.push(format!("{} = ${}", field, index));
        self
    }

    fn set_computed(&mut self, field: &str, value: &str) -> &mut Self {
        self.fields.push(format!("{} = {}", field, value));
        self
    }
}

impl QueryBuilderWithQueries for UpdateBuilder {
    fn with_query(&mut self, name: &str, query: &str) -> &mut Self {
        self.with_queries.push((name.into(), query.into()));
        self
    }
}

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

    #[test]
    fn from_scratch() {
        let builder = UpdateBuilder::new("publishers");
        assert_eq!(builder.get_query(), "UPDATE publishers");
    }

    #[test]
    fn with_fields_and_where() {
        let mut builder = UpdateBuilder::new("publishers");
        builder.where_eq("trololo", 42);
        builder.set("id", 5);
        assert_eq!(
            builder.get_query(),
            "UPDATE publishers SET id = $2 WHERE trololo = $1"
        );
    }

    #[test]
    fn with_computed_fields_and_where() {
        let mut builder = UpdateBuilder::new("publishers");
        builder.where_eq("trololo", 42);
        builder.set("id", 5);
        builder.set_computed("trololo", "md5(42)");
        assert_eq!(
            builder.get_query(),
            "UPDATE publishers SET id = $2, trololo = md5(42) WHERE trololo = $1"
        );
    }
}