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use std::collections::BTreeSet;

use crate::prelude::*;
use crate::schema::SchemaAttribute;
use crate::value::{DISALLOWED_NAMES, INAME_RE};
use crate::valueset::{DbValueSetV2, ValueSet};

#[derive(Debug, Clone)]
pub struct ValueSetIname {
    set: BTreeSet<String>,
}

impl ValueSetIname {
    pub fn new(s: &str) -> Box<Self> {
        let mut set = BTreeSet::new();
        set.insert(s.to_lowercase());
        Box::new(ValueSetIname { set })
    }

    pub fn push(&mut self, s: &str) -> bool {
        self.set.insert(s.to_lowercase())
    }

    pub fn from_dbvs2(data: Vec<String>) -> Result<ValueSet, OperationError> {
        let set = data.into_iter().collect();
        Ok(Box::new(ValueSetIname { set }))
    }

    // We need to allow this, because rust doesn't allow us to impl FromIterator on foreign
    // types, and str is foreign
    #[allow(clippy::should_implement_trait)]
    pub fn from_iter<'a, T>(iter: T) -> Option<Box<Self>>
    where
        T: IntoIterator<Item = &'a str>,
    {
        let set = iter.into_iter().map(str::to_string).collect();
        Some(Box::new(ValueSetIname { set }))
    }
}

impl ValueSetT for ValueSetIname {
    fn insert_checked(&mut self, value: Value) -> Result<bool, OperationError> {
        match value {
            Value::Iname(s) => Ok(self.set.insert(s)),
            _ => {
                debug_assert!(false);
                Err(OperationError::InvalidValueState)
            }
        }
    }

    fn clear(&mut self) {
        self.set.clear();
    }

    fn remove(&mut self, pv: &PartialValue) -> bool {
        match pv {
            PartialValue::Iname(s) => self.set.remove(s),
            _ => {
                debug_assert!(false);
                true
            }
        }
    }

    fn contains(&self, pv: &PartialValue) -> bool {
        match pv {
            PartialValue::Iname(s) => self.set.contains(s.as_str()),
            _ => false,
        }
    }

    fn substring(&self, pv: &PartialValue) -> bool {
        match pv {
            PartialValue::Iname(s2) => self.set.iter().any(|s1| s1.contains(s2)),
            _ => {
                debug_assert!(false);
                false
            }
        }
    }

    fn lessthan(&self, _pv: &PartialValue) -> bool {
        false
    }

    fn len(&self) -> usize {
        self.set.len()
    }

    fn generate_idx_eq_keys(&self) -> Vec<String> {
        self.set.iter().cloned().collect()
    }

    fn syntax(&self) -> SyntaxType {
        SyntaxType::Utf8StringIname
    }

    fn validate(&self, _schema_attr: &SchemaAttribute) -> bool {
        self.set.iter().all(|s| {
            match Uuid::parse_str(s) {
                // It is a uuid, disallow.
                Ok(_) => false,
                // Not a uuid, check it against the re.
                Err(_) => INAME_RE.is_match(s) && !DISALLOWED_NAMES.contains(s.as_str()),
            }
        })
    }

    fn to_proto_string_clone_iter(&self) -> Box<dyn Iterator<Item = String> + '_> {
        Box::new(self.set.iter().cloned())
    }

    fn to_db_valueset_v2(&self) -> DbValueSetV2 {
        DbValueSetV2::Iname(self.set.iter().cloned().collect())
    }

    fn to_partialvalue_iter(&self) -> Box<dyn Iterator<Item = PartialValue> + '_> {
        Box::new(self.set.iter().map(|i| PartialValue::new_iname(i.as_str())))
    }

    fn to_value_iter(&self) -> Box<dyn Iterator<Item = Value> + '_> {
        Box::new(self.set.iter().map(|i| Value::new_iname(i.as_str())))
    }

    fn equal(&self, other: &ValueSet) -> bool {
        if let Some(other) = other.as_iname_set() {
            &self.set == other
        } else {
            debug_assert!(false);
            false
        }
    }

    fn merge(&mut self, other: &ValueSet) -> Result<(), OperationError> {
        if let Some(b) = other.as_iname_set() {
            mergesets!(self.set, b)
        } else {
            debug_assert!(false);
            Err(OperationError::InvalidValueState)
        }
    }

    fn to_iname_single(&self) -> Option<&str> {
        if self.set.len() == 1 {
            self.set.iter().take(1).next().map(|s| s.as_str())
        } else {
            None
        }
    }

    fn as_iname_set(&self) -> Option<&BTreeSet<String>> {
        Some(&self.set)
    }

    fn as_iname_iter(&self) -> Option<Box<dyn Iterator<Item = &str> + '_>> {
        Some(Box::new(self.set.iter().map(|s| s.as_str())))
    }

    fn migrate_iutf8_iname(&self) -> Result<Option<ValueSet>, OperationError> {
        Ok(None)
    }
}