use std::{collections::HashSet, fmt::Display};

pub(crate) use create::Create;
pub(crate) use create_index::CreateIndex;
pub(crate) use delete::Delete;
pub(crate) use drop::Drop;
pub(crate) use insert::Insert;
pub(crate) use select::Select;
use serde::{Deserialize, Serialize};
use turso_sqlite3_parser::to_sql_string::ToSqlContext;
use update::Update;

use crate::{
    generation::Shadow,
    model::{
        query::transaction::{Begin, Commit, Rollback},
        table::SimValue,
    },
    runner::env::SimulatorTables,
};

pub mod create;
pub mod create_index;
pub mod delete;
pub mod drop;
pub mod insert;
pub mod predicate;
pub mod select;
pub mod transaction;
pub mod update;

// This type represents the potential queries on the database.
#[derive(Debug, Clone, Serialize, Deserialize)]
pub(crate) enum Query {
    Create(Create),
    Select(Select),
    Insert(Insert),
    Delete(Delete),
    Update(Update),
    Drop(Drop),
    CreateIndex(CreateIndex),
    Begin(Begin),
    Commit(Commit),
    Rollback(Rollback),
}

impl Query {
    pub(crate) fn dependencies(&self) -> HashSet<String> {
        match self {
            Query::Select(select) => select.dependencies(),
            Query::Create(_) => HashSet::new(),
            Query::Insert(Insert::Select { table, .. })
            | Query::Insert(Insert::Values { table, .. })
            | Query::Delete(Delete { table, .. })
            | Query::Update(Update { table, .. })
            | Query::Drop(Drop { table, .. }) => HashSet::from_iter([table.clone()]),
            Query::CreateIndex(CreateIndex { table_name, .. }) => {
                HashSet::from_iter([table_name.clone()])
            }
            Query::Begin(_) | Query::Commit(_) | Query::Rollback(_) => HashSet::new(),
        }
    }
    pub(crate) fn uses(&self) -> Vec<String> {
        match self {
            Query::Create(Create { table }) => vec![table.name.clone()],
            Query::Select(select) => select.dependencies().into_iter().collect(),
            Query::Insert(Insert::Select { table, .. })
            | Query::Insert(Insert::Values { table, .. })
            | Query::Delete(Delete { table, .. })
            | Query::Update(Update { table, .. })
            | Query::Drop(Drop { table, .. }) => vec![table.clone()],
            Query::CreateIndex(CreateIndex { table_name, .. }) => vec![table_name.clone()],
            Query::Begin(..) | Query::Commit(..) | Query::Rollback(..) => vec![],
        }
    }
}

impl Shadow for Query {
    type Result = anyhow::Result<Vec<Vec<SimValue>>>;

    fn shadow(&self, env: &mut SimulatorTables) -> Self::Result {
        match self {
            Query::Create(create) => create.shadow(env),
            Query::Insert(insert) => insert.shadow(env),
            Query::Delete(delete) => delete.shadow(env),
            Query::Select(select) => select.shadow(env),
            Query::Update(update) => update.shadow(env),
            Query::Drop(drop) => drop.shadow(env),
            Query::CreateIndex(create_index) => Ok(create_index.shadow(env)),
            Query::Begin(begin) => Ok(begin.shadow(env)),
            Query::Commit(commit) => Ok(commit.shadow(env)),
            Query::Rollback(rollback) => Ok(rollback.shadow(env)),
        }
    }
}

impl Display for Query {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            Self::Create(create) => write!(f, "{create}"),
            Self::Select(select) => write!(f, "{select}"),
            Self::Insert(insert) => write!(f, "{insert}"),
            Self::Delete(delete) => write!(f, "{delete}"),
            Self::Update(update) => write!(f, "{update}"),
            Self::Drop(drop) => write!(f, "{drop}"),
            Self::CreateIndex(create_index) => write!(f, "{create_index}"),
            Self::Begin(begin) => write!(f, "{begin}"),
            Self::Commit(commit) => write!(f, "{commit}"),
            Self::Rollback(rollback) => write!(f, "{rollback}"),
        }
    }
}

/// Used to print sql strings that already have all the context it needs
pub(crate) struct EmptyContext;

impl ToSqlContext for EmptyContext {
    fn get_column_name(
        &self,
        _table_id: turso_sqlite3_parser::ast::TableInternalId,
        _col_idx: usize,
    ) -> &str {
        unreachable!()
    }

    fn get_table_name(&self, _id: turso_sqlite3_parser::ast::TableInternalId) -> &str {
        unreachable!()
    }
}