use crate::VirtualTable;
use crate::{util::normalize_ident, Result};
use core::fmt;
use fallible_iterator::FallibleIterator;
use limbo_sqlite3_parser::ast::{Expr, Literal, TableOptions};
use limbo_sqlite3_parser::{
    ast::{Cmd, CreateTableBody, QualifiedName, ResultColumn, Stmt},
    lexer::sql::Parser,
};
use std::collections::HashMap;
use std::rc::Rc;
use tracing::trace;

pub struct Schema {
    pub tables: HashMap<String, Rc<BTreeTable>>,
    // table_name to list of indexes for the table
    pub indexes: HashMap<String, Vec<Rc<Index>>>,
}

impl Schema {
    pub fn new() -> Self {
        let mut tables: HashMap<String, Rc<BTreeTable>> = HashMap::new();
        let indexes: HashMap<String, Vec<Rc<Index>>> = HashMap::new();
        tables.insert("sqlite_schema".to_string(), Rc::new(sqlite_schema_table()));
        Self { tables, indexes }
    }

    pub fn add_table(&mut self, table: Rc<BTreeTable>) {
        let name = normalize_ident(&table.name);
        self.tables.insert(name, table);
    }

    pub fn remove_table(&mut self, table_name: &str) {
        let name = normalize_ident(table_name);
        self.tables.remove(&name);
    }

    pub fn get_table(&self, name: &str) -> Option<Rc<BTreeTable>> {
        let name = normalize_ident(name);
        self.tables.get(&name).cloned()
    }

    pub fn add_index(&mut self, index: Rc<Index>) {
        let table_name = normalize_ident(&index.table_name);
        self.indexes
            .entry(table_name)
            .or_default()
            .push(index.clone())
    }

    pub fn get_indices(&self, table_name: &str) -> &[Rc<Index>] {
        let name = normalize_ident(table_name);
        self.indexes
            .get(&name)
            .map_or_else(|| &[] as &[Rc<Index>], |v| v.as_slice())
    }

    pub fn remove_indices_for_table(&mut self, table_name: &str) {
        let name = normalize_ident(table_name);
        self.indexes.remove(&name);
    }
}

#[derive(Clone, Debug)]
pub enum Table {
    BTree(Rc<BTreeTable>),
    Pseudo(Rc<PseudoTable>),
    Virtual(Rc<VirtualTable>),
}

impl Table {
    pub fn get_root_page(&self) -> usize {
        match self {
            Table::BTree(table) => table.root_page,
            Table::Pseudo(_) => unimplemented!(),
            Table::Virtual(_) => unimplemented!(),
        }
    }

    pub fn get_name(&self) -> &str {
        match self {
            Self::BTree(table) => &table.name,
            Self::Pseudo(_) => "",
            Self::Virtual(table) => &table.name,
        }
    }

    pub fn get_column_at(&self, index: usize) -> Option<&Column> {
        match self {
            Self::BTree(table) => table.columns.get(index),
            Self::Pseudo(table) => table.columns.get(index),
            Self::Virtual(table) => table.columns.get(index),
        }
    }

    pub fn columns(&self) -> &Vec<Column> {
        match self {
            Self::BTree(table) => &table.columns,
            Self::Pseudo(table) => &table.columns,
            Self::Virtual(table) => &table.columns,
        }
    }

    pub fn btree(&self) -> Option<Rc<BTreeTable>> {
        match self {
            Self::BTree(table) => Some(table.clone()),
            Self::Pseudo(_) => None,
            Self::Virtual(_) => None,
        }
    }

    pub fn virtual_table(&self) -> Option<Rc<VirtualTable>> {
        match self {
            Self::Virtual(table) => Some(table.clone()),
            _ => None,
        }
    }
}

impl PartialEq for Table {
    fn eq(&self, other: &Self) -> bool {
        match (self, other) {
            (Self::BTree(a), Self::BTree(b)) => Rc::ptr_eq(a, b),
            (Self::Pseudo(a), Self::Pseudo(b)) => Rc::ptr_eq(a, b),
            (Self::Virtual(a), Self::Virtual(b)) => Rc::ptr_eq(a, b),
            _ => false,
        }
    }
}

#[derive(Debug)]
pub struct BTreeTable {
    pub root_page: usize,
    pub name: String,
    pub primary_key_column_names: Vec<String>,
    pub columns: Vec<Column>,
    pub has_rowid: bool,
}

impl BTreeTable {
    pub fn get_rowid_alias_column(&self) -> Option<(usize, &Column)> {
        if self.primary_key_column_names.len() == 1 {
            let (idx, col) = self.get_column(&self.primary_key_column_names[0]).unwrap();
            if self.column_is_rowid_alias(col) {
                return Some((idx, col));
            }
        }
        None
    }

    pub fn column_is_rowid_alias(&self, col: &Column) -> bool {
        col.is_rowid_alias
    }

    pub fn get_column(&self, name: &str) -> Option<(usize, &Column)> {
        let name = normalize_ident(name);
        for (i, column) in self.columns.iter().enumerate() {
            if column.name.as_ref().map_or(false, |n| *n == name) {
                return Some((i, column));
            }
        }
        None
    }

    pub fn from_sql(sql: &str, root_page: usize) -> Result<BTreeTable> {
        let mut parser = Parser::new(sql.as_bytes());
        let cmd = parser.next()?;
        match cmd {
            Some(Cmd::Stmt(Stmt::CreateTable { tbl_name, body, .. })) => {
                create_table(tbl_name, *body, root_page)
            }
            _ => todo!("Expected CREATE TABLE statement"),
        }
    }

    #[cfg(test)]
    pub fn to_sql(&self) -> String {
        let mut sql = format!("CREATE TABLE {} (\n", self.name);
        for (i, column) in self.columns.iter().enumerate() {
            if i > 0 {
                sql.push_str(",\n");
            }
            sql.push_str("  ");
            sql.push_str(column.name.as_ref().expect("column name is None"));
            sql.push(' ');
            sql.push_str(&column.ty.to_string());
        }
        sql.push_str(");\n");
        sql
    }
}

#[derive(Debug)]
pub struct PseudoTable {
    pub columns: Vec<Column>,
}

impl PseudoTable {
    pub fn new() -> Self {
        Self { columns: vec![] }
    }

    pub fn new_with_columns(columns: Vec<Column>) -> Self {
        Self { columns }
    }

    pub fn add_column(&mut self, name: &str, ty: Type, primary_key: bool) {
        self.columns.push(Column {
            name: Some(normalize_ident(name)),
            ty,
            ty_str: ty.to_string().to_uppercase(),
            primary_key,
            is_rowid_alias: false,
            notnull: false,
            default: None,
        });
    }
    pub fn get_column(&self, name: &str) -> Option<(usize, &Column)> {
        let name = normalize_ident(name);
        for (i, column) in self.columns.iter().enumerate() {
            if column.name.as_ref().map_or(false, |n| *n == name) {
                return Some((i, column));
            }
        }
        None
    }
}

impl Default for PseudoTable {
    fn default() -> Self {
        Self::new()
    }
}

fn create_table(
    tbl_name: QualifiedName,
    body: CreateTableBody,
    root_page: usize,
) -> Result<BTreeTable> {
    let table_name = normalize_ident(&tbl_name.name.0);
    trace!("Creating table {}", table_name);
    let mut has_rowid = true;
    let mut primary_key_column_names = vec![];
    let mut cols = vec![];
    match body {
        CreateTableBody::ColumnsAndConstraints {
            columns,
            constraints,
            options,
        } => {
            if let Some(constraints) = constraints {
                for c in constraints {
                    if let limbo_sqlite3_parser::ast::TableConstraint::PrimaryKey {
                        columns, ..
                    } = c.constraint
                    {
                        for column in columns {
                            primary_key_column_names.push(match column.expr {
                                Expr::Id(id) => normalize_ident(&id.0),
                                Expr::Literal(Literal::String(value)) => {
                                    value.trim_matches('\'').to_owned()
                                }
                                _ => {
                                    todo!("Unsupported primary key expression");
                                }
                            });
                        }
                    }
                }
            }
            for (col_name, col_def) in columns {
                let name = col_name.0.to_string();
                // Regular sqlite tables have an integer rowid that uniquely identifies a row.
                // Even if you create a table with a column e.g. 'id INT PRIMARY KEY', there will still
                // be a separate hidden rowid, and the 'id' column will have a separate index built for it.
                //
                // However:
                // A column defined as exactly INTEGER PRIMARY KEY is a rowid alias, meaning that the rowid
                // and the value of this column are the same.
                // https://www.sqlite.org/lang_createtable.html#rowids_and_the_integer_primary_key
                let mut typename_exactly_integer = false;
                let (ty, ty_str) = match col_def.col_type {
                    Some(data_type) => {
                        let s = data_type.name.as_str();
                        let ty_str = if matches!(
                            s.to_uppercase().as_str(),
                            "TEXT" | "INT" | "INTEGER" | "BLOB" | "REAL"
                        ) {
                            s.to_uppercase().to_string()
                        } else {
                            s.to_string()
                        };

                        // https://www.sqlite.org/datatype3.html
                        let type_name = ty_str.to_uppercase();
                        if type_name.contains("INT") {
                            typename_exactly_integer = type_name == "INTEGER";
                            (Type::Integer, ty_str)
                        } else if type_name.contains("CHAR")
                            || type_name.contains("CLOB")
                            || type_name.contains("TEXT")
                        {
                            (Type::Text, ty_str)
                        } else if type_name.contains("BLOB") {
                            (Type::Blob, ty_str)
                        } else if type_name.is_empty() {
                            (Type::Blob, "".to_string())
                        } else if type_name.contains("REAL")
                            || type_name.contains("FLOA")
                            || type_name.contains("DOUB")
                        {
                            (Type::Real, ty_str)
                        } else {
                            (Type::Numeric, ty_str)
                        }
                    }
                    None => (Type::Null, "".to_string()),
                };

                let mut default = None;
                let mut primary_key = false;
                let mut notnull = false;
                for c_def in &col_def.constraints {
                    match &c_def.constraint {
                        limbo_sqlite3_parser::ast::ColumnConstraint::PrimaryKey { .. } => {
                            primary_key = true;
                        }
                        limbo_sqlite3_parser::ast::ColumnConstraint::NotNull { .. } => {
                            notnull = true;
                        }
                        limbo_sqlite3_parser::ast::ColumnConstraint::Default(expr) => {
                            default = Some(expr.clone())
                        }
                        _ => {}
                    }
                }

                if primary_key {
                    primary_key_column_names.push(name.clone());
                } else if primary_key_column_names.contains(&name) {
                    primary_key = true;
                }

                cols.push(Column {
                    name: Some(normalize_ident(&name)),
                    ty,
                    ty_str,
                    primary_key,
                    is_rowid_alias: typename_exactly_integer && primary_key,
                    notnull,
                    default,
                });
            }
            if options.contains(TableOptions::WITHOUT_ROWID) {
                has_rowid = false;
            }
        }
        CreateTableBody::AsSelect(_) => todo!(),
    };
    // flip is_rowid_alias back to false if the table has multiple primary keys
    // or if the table has no rowid
    if !has_rowid || primary_key_column_names.len() > 1 {
        for col in cols.iter_mut() {
            col.is_rowid_alias = false;
        }
    }
    Ok(BTreeTable {
        root_page,
        name: table_name,
        has_rowid,
        primary_key_column_names,
        columns: cols,
    })
}

pub fn _build_pseudo_table(columns: &[ResultColumn]) -> PseudoTable {
    let table = PseudoTable::new();
    for column in columns {
        match column {
            ResultColumn::Expr(expr, _as_name) => {
                todo!("unsupported expression {:?}", expr);
            }
            ResultColumn::Star => {
                todo!();
            }
            ResultColumn::TableStar(_) => {
                todo!();
            }
        }
    }
    table
}

#[derive(Debug, Clone)]
pub struct Column {
    pub name: Option<String>,
    pub ty: Type,
    // many sqlite operations like table_info retain the original string
    pub ty_str: String,
    pub primary_key: bool,
    pub is_rowid_alias: bool,
    pub notnull: bool,
    pub default: Option<Expr>,
}

impl Column {
    pub fn affinity(&self) -> Affinity {
        affinity(&self.ty_str)
    }
}

/// 3.1. Determination Of Column Affinity
/// For tables not declared as STRICT, the affinity of a column is determined by the declared type of the column, according to the following rules in the order shown:
///
/// If the declared type contains the string "INT" then it is assigned INTEGER affinity.
///
/// If the declared type of the column contains any of the strings "CHAR", "CLOB", or "TEXT" then that column has TEXT affinity. Notice that the type VARCHAR contains the string "CHAR" and is thus assigned TEXT affinity.
///
/// If the declared type for a column contains the string "BLOB" or if no type is specified then the column has affinity BLOB.
///
/// If the declared type for a column contains any of the strings "REAL", "FLOA", or "DOUB" then the column has REAL affinity.
///
/// Otherwise, the affinity is NUMERIC.
///
/// Note that the order of the rules for determining column affinity is important. A column whose declared type is "CHARINT" will match both rules 1 and 2 but the first rule takes precedence and so the column affinity will be INTEGER.
pub fn affinity(datatype: &str) -> Affinity {
    // Note: callers of this function must ensure that the datatype is uppercase.
    // Rule 1: INT -> INTEGER affinity
    if datatype.contains("INT") {
        return Affinity::Integer;
    }

    // Rule 2: CHAR/CLOB/TEXT -> TEXT affinity
    if datatype.contains("CHAR") || datatype.contains("CLOB") || datatype.contains("TEXT") {
        return Affinity::Text;
    }

    // Rule 3: BLOB or empty -> BLOB affinity (historically called NONE)
    if datatype.contains("BLOB") || datatype.is_empty() {
        return Affinity::Blob;
    }

    // Rule 4: REAL/FLOA/DOUB -> REAL affinity
    if datatype.contains("REAL") || datatype.contains("FLOA") || datatype.contains("DOUB") {
        return Affinity::Real;
    }

    // Rule 5: Otherwise -> NUMERIC affinity
    Affinity::Numeric
}

#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Type {
    Null,
    Text,
    Numeric,
    Integer,
    Real,
    Blob,
}

/// Each column in an SQLite 3 database is assigned one of the following type affinities:
///
/// TEXT
/// NUMERIC
/// INTEGER
/// REAL
/// BLOB
/// (Historical note: The "BLOB" type affinity used to be called "NONE". But that term was easy to confuse with "no affinity" and so it was renamed.)
///
/// A column with TEXT affinity stores all data using storage classes NULL, TEXT or BLOB. If numerical data is inserted into a column with TEXT affinity it is converted into text form before being stored.
///
/// A column with NUMERIC affinity may contain values using all five storage classes. When text data is inserted into a NUMERIC column, the storage class of the text is converted to INTEGER or REAL (in order of preference) if the text is a well-formed integer or real literal, respectively. If the TEXT value is a well-formed integer literal that is too large to fit in a 64-bit signed integer, it is converted to REAL. For conversions between TEXT and REAL storage classes, only the first 15 significant decimal digits of the number are preserved. If the TEXT value is not a well-formed integer or real literal, then the value is stored as TEXT. For the purposes of this paragraph, hexadecimal integer literals are not considered well-formed and are stored as TEXT. (This is done for historical compatibility with versions of SQLite prior to version 3.8.6 2014-08-15 where hexadecimal integer literals were first introduced into SQLite.) If a floating point value that can be represented exactly as an integer is inserted into a column with NUMERIC affinity, the value is converted into an integer. No attempt is made to convert NULL or BLOB values.
///
/// A string might look like a floating-point literal with a decimal point and/or exponent notation but as long as the value can be expressed as an integer, the NUMERIC affinity will convert it into an integer. Hence, the string '3.0e+5' is stored in a column with NUMERIC affinity as the integer 300000, not as the floating point value 300000.0.
///
/// A column that uses INTEGER affinity behaves the same as a column with NUMERIC affinity. The difference between INTEGER and NUMERIC affinity is only evident in a CAST expression: The expression "CAST(4.0 AS INT)" returns an integer 4, whereas "CAST(4.0 AS NUMERIC)" leaves the value as a floating-point 4.0.
///
/// A column with REAL affinity behaves like a column with NUMERIC affinity except that it forces integer values into floating point representation. (As an internal optimization, small floating point values with no fractional component and stored in columns with REAL affinity are written to disk as integers in order to take up less space and are automatically converted back into floating point as the value is read out. This optimization is completely invisible at the SQL level and can only be detected by examining the raw bits of the database file.)
///
/// A column with affinity BLOB does not prefer one storage class over another and no attempt is made to coerce data from one storage class into another.
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum Affinity {
    Integer,
    Text,
    Blob,
    Real,
    Numeric,
}

pub const SQLITE_AFF_TEXT: char = 'a';
pub const SQLITE_AFF_NONE: char = 'b'; // Historically called NONE, but it's the same as BLOB
pub const SQLITE_AFF_NUMERIC: char = 'c';
pub const SQLITE_AFF_INTEGER: char = 'd';
pub const SQLITE_AFF_REAL: char = 'e';

impl Affinity {
    /// This is meant to be used in opcodes like Eq, which state:
    ///
    /// "The SQLITE_AFF_MASK portion of P5 must be an affinity character - SQLITE_AFF_TEXT, SQLITE_AFF_INTEGER, and so forth.
    /// An attempt is made to coerce both inputs according to this affinity before the comparison is made.
    /// If the SQLITE_AFF_MASK is 0x00, then numeric affinity is used.
    /// Note that the affinity conversions are stored back into the input registers P1 and P3.
    /// So this opcode can cause persistent changes to registers P1 and P3.""
    pub fn aff_mask(&self) -> char {
        match self {
            Affinity::Integer => SQLITE_AFF_INTEGER,
            Affinity::Text => SQLITE_AFF_TEXT,
            Affinity::Blob => SQLITE_AFF_NONE,
            Affinity::Real => SQLITE_AFF_REAL,
            Affinity::Numeric => SQLITE_AFF_NUMERIC,
        }
    }
}

impl fmt::Display for Type {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let s = match self {
            Self::Null => "",
            Self::Text => "TEXT",
            Self::Numeric => "NUMERIC",
            Self::Integer => "INTEGER",
            Self::Real => "REAL",
            Self::Blob => "BLOB",
        };
        write!(f, "{}", s)
    }
}

pub fn sqlite_schema_table() -> BTreeTable {
    BTreeTable {
        root_page: 1,
        name: "sqlite_schema".to_string(),
        has_rowid: true,
        primary_key_column_names: vec![],
        columns: vec![
            Column {
                name: Some("type".to_string()),
                ty: Type::Text,
                ty_str: "TEXT".to_string(),
                primary_key: false,
                is_rowid_alias: false,
                notnull: false,
                default: None,
            },
            Column {
                name: Some("name".to_string()),
                ty: Type::Text,
                ty_str: "TEXT".to_string(),
                primary_key: false,
                is_rowid_alias: false,
                notnull: false,
                default: None,
            },
            Column {
                name: Some("tbl_name".to_string()),
                ty: Type::Text,
                ty_str: "TEXT".to_string(),
                primary_key: false,
                is_rowid_alias: false,
                notnull: false,
                default: None,
            },
            Column {
                name: Some("rootpage".to_string()),
                ty: Type::Integer,
                ty_str: "INT".to_string(),
                primary_key: false,
                is_rowid_alias: false,
                notnull: false,
                default: None,
            },
            Column {
                name: Some("sql".to_string()),
                ty: Type::Text,
                ty_str: "TEXT".to_string(),
                primary_key: false,
                is_rowid_alias: false,
                notnull: false,
                default: None,
            },
        ],
    }
}

#[allow(dead_code)]
#[derive(Debug)]
pub struct Index {
    pub name: String,
    pub table_name: String,
    pub root_page: usize,
    pub columns: Vec<IndexColumn>,
    pub unique: bool,
}

#[allow(dead_code)]
#[derive(Debug, Clone)]
pub struct IndexColumn {
    pub name: String,
    pub order: Order,
}

#[derive(Debug, Clone, PartialEq)]
pub enum Order {
    Ascending,
    Descending,
}

impl Index {
    pub fn from_sql(sql: &str, root_page: usize) -> Result<Index> {
        let mut parser = Parser::new(sql.as_bytes());
        let cmd = parser.next()?;
        match cmd {
            Some(Cmd::Stmt(Stmt::CreateIndex {
                idx_name,
                tbl_name,
                columns,
                unique,
                ..
            })) => {
                let index_name = normalize_ident(&idx_name.name.0);
                let index_columns = columns
                    .into_iter()
                    .map(|col| IndexColumn {
                        name: normalize_ident(&col.expr.to_string()),
                        order: match col.order {
                            Some(limbo_sqlite3_parser::ast::SortOrder::Asc) => Order::Ascending,
                            Some(limbo_sqlite3_parser::ast::SortOrder::Desc) => Order::Descending,
                            None => Order::Ascending,
                        },
                    })
                    .collect();
                Ok(Index {
                    name: index_name,
                    table_name: normalize_ident(&tbl_name.0),
                    root_page,
                    columns: index_columns,
                    unique,
                })
            }
            _ => todo!("Expected create index statement"),
        }
    }

    pub fn automatic_from_primary_key(
        table: &BTreeTable,
        index_name: &str,
        root_page: usize,
    ) -> Result<Index> {
        if table.primary_key_column_names.is_empty() {
            return Err(crate::LimboError::InternalError(
                "Cannot create automatic index for table without primary key".to_string(),
            ));
        }

        let index_columns = table
            .primary_key_column_names
            .iter()
            .map(|col_name| {
                // Verify that each primary key column exists in the table
                if table.get_column(col_name).is_none() {
                    return Err(crate::LimboError::InternalError(format!(
                        "Primary key column {} not found in table {}",
                        col_name, table.name
                    )));
                }
                Ok(IndexColumn {
                    name: normalize_ident(col_name),
                    order: Order::Ascending, // Primary key indexes are always ascending
                })
            })
            .collect::<Result<Vec<_>>>()?;

        Ok(Index {
            name: normalize_ident(index_name),
            table_name: table.name.clone(),
            root_page,
            columns: index_columns,
            unique: true, // Primary key indexes are always unique
        })
    }
}

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

    #[test]
    pub fn test_has_rowid_true() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER PRIMARY KEY, b TEXT);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        assert!(table.has_rowid, "has_rowid should be set to true");
        Ok(())
    }

    #[test]
    pub fn test_has_rowid_false() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER PRIMARY KEY, b TEXT) WITHOUT ROWID;"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        assert!(!table.has_rowid, "has_rowid should be set to false");
        Ok(())
    }

    #[test]
    pub fn test_column_is_rowid_alias_single_text() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a TEXT PRIMARY KEY, b TEXT);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(
            !table.column_is_rowid_alias(column),
            "column 'a´ has type different than INTEGER so can't be a rowid alias"
        );
        Ok(())
    }

    #[test]
    pub fn test_column_is_rowid_alias_single_integer() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER PRIMARY KEY, b TEXT);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(
            table.column_is_rowid_alias(column),
            "column 'a´ should be a rowid alias"
        );
        Ok(())
    }

    #[test]
    pub fn test_column_is_rowid_alias_single_integer_separate_primary_key_definition() -> Result<()>
    {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT, PRIMARY KEY(a));"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(
            table.column_is_rowid_alias(column),
            "column 'a´ should be a rowid alias"
        );
        Ok(())
    }

    #[test]
    pub fn test_column_is_rowid_alias_single_integer_separate_primary_key_definition_without_rowid(
    ) -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT, PRIMARY KEY(a)) WITHOUT ROWID;"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(
            !table.column_is_rowid_alias(column),
            "column 'a´ shouldn't be a rowid alias because table has no rowid"
        );
        Ok(())
    }

    #[test]
    pub fn test_column_is_rowid_alias_single_integer_without_rowid() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER PRIMARY KEY, b TEXT) WITHOUT ROWID;"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(
            !table.column_is_rowid_alias(column),
            "column 'a´ shouldn't be a rowid alias because table has no rowid"
        );
        Ok(())
    }

    #[test]
    pub fn test_column_is_rowid_alias_inline_composite_primary_key() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER PRIMARY KEY, b TEXT PRIMARY KEY);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(
            !table.column_is_rowid_alias(column),
            "column 'a´ shouldn't be a rowid alias because table has composite primary key"
        );
        Ok(())
    }

    #[test]
    pub fn test_column_is_rowid_alias_separate_composite_primary_key_definition() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT, PRIMARY KEY(a, b));"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(
            !table.column_is_rowid_alias(column),
            "column 'a´ shouldn't be a rowid alias because table has composite primary key"
        );
        Ok(())
    }

    #[test]
    pub fn test_primary_key_inline_single() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER PRIMARY KEY, b TEXT, c REAL);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(column.primary_key, "column 'a' should be a primary key");
        let column = table.get_column("b").unwrap().1;
        assert!(!column.primary_key, "column 'b' shouldn't be a primary key");
        let column = table.get_column("c").unwrap().1;
        assert!(!column.primary_key, "column 'c' shouldn't be a primary key");
        assert_eq!(
            vec!["a"],
            table.primary_key_column_names,
            "primary key column names should be ['a']"
        );
        Ok(())
    }

    #[test]
    pub fn test_primary_key_inline_multiple() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER PRIMARY KEY, b TEXT PRIMARY KEY, c REAL);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(column.primary_key, "column 'a' should be a primary key");
        let column = table.get_column("b").unwrap().1;
        assert!(column.primary_key, "column 'b' shouldn be a primary key");
        let column = table.get_column("c").unwrap().1;
        assert!(!column.primary_key, "column 'c' shouldn't be a primary key");
        assert_eq!(
            vec!["a", "b"],
            table.primary_key_column_names,
            "primary key column names should be ['a', 'b']"
        );
        Ok(())
    }

    #[test]
    pub fn test_primary_key_separate_single() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT, c REAL, PRIMARY KEY(a));"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(column.primary_key, "column 'a' should be a primary key");
        let column = table.get_column("b").unwrap().1;
        assert!(!column.primary_key, "column 'b' shouldn't be a primary key");
        let column = table.get_column("c").unwrap().1;
        assert!(!column.primary_key, "column 'c' shouldn't be a primary key");
        assert_eq!(
            vec!["a"],
            table.primary_key_column_names,
            "primary key column names should be ['a']"
        );
        Ok(())
    }

    #[test]
    pub fn test_primary_key_separate_multiple() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT, c REAL, PRIMARY KEY(a, b));"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(column.primary_key, "column 'a' should be a primary key");
        let column = table.get_column("b").unwrap().1;
        assert!(column.primary_key, "column 'b' shouldn be a primary key");
        let column = table.get_column("c").unwrap().1;
        assert!(!column.primary_key, "column 'c' shouldn't be a primary key");
        assert_eq!(
            vec!["a", "b"],
            table.primary_key_column_names,
            "primary key column names should be ['a', 'b']"
        );
        Ok(())
    }

    #[test]
    pub fn test_primary_key_separate_single_quoted() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT, c REAL, PRIMARY KEY('a'));"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(column.primary_key, "column 'a' should be a primary key");
        let column = table.get_column("b").unwrap().1;
        assert!(!column.primary_key, "column 'b' shouldn't be a primary key");
        let column = table.get_column("c").unwrap().1;
        assert!(!column.primary_key, "column 'c' shouldn't be a primary key");
        assert_eq!(
            vec!["a"],
            table.primary_key_column_names,
            "primary key column names should be ['a']"
        );
        Ok(())
    }
    #[test]
    pub fn test_primary_key_separate_single_doubly_quoted() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT, c REAL, PRIMARY KEY("a"));"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert!(column.primary_key, "column 'a' should be a primary key");
        let column = table.get_column("b").unwrap().1;
        assert!(!column.primary_key, "column 'b' shouldn't be a primary key");
        let column = table.get_column("c").unwrap().1;
        assert!(!column.primary_key, "column 'c' shouldn't be a primary key");
        assert_eq!(
            vec!["a"],
            table.primary_key_column_names,
            "primary key column names should be ['a']"
        );
        Ok(())
    }

    #[test]
    pub fn test_default_value() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER DEFAULT 23);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        let default = column.default.clone().unwrap();
        assert_eq!(default.to_string(), "23");
        Ok(())
    }

    #[test]
    pub fn test_col_notnull() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER NOT NULL);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert_eq!(column.notnull, true);
        Ok(())
    }

    #[test]
    pub fn test_col_notnull_negative() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert_eq!(column.notnull, false);
        Ok(())
    }

    #[test]
    pub fn test_col_type_string_integer() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a InTeGeR);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert_eq!(column.ty_str, "INTEGER");
        Ok(())
    }

    #[test]
    pub fn test_col_type_string_int() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a InT);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert_eq!(column.ty_str, "INT");
        Ok(())
    }

    #[test]
    pub fn test_col_type_string_blob() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a bLoB);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert_eq!(column.ty_str, "BLOB");
        Ok(())
    }

    #[test]
    pub fn test_col_type_string_empty() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert_eq!(column.ty_str, "");
        Ok(())
    }

    #[test]
    pub fn test_col_type_string_some_nonsense() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a someNonsenseName);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let column = table.get_column("a").unwrap().1;
        assert_eq!(column.ty_str, "someNonsenseName");
        Ok(())
    }

    #[test]
    pub fn test_sqlite_schema() {
        let expected = r#"CREATE TABLE sqlite_schema (
  type TEXT,
  name TEXT,
  tbl_name TEXT,
  rootpage INTEGER,
  sql TEXT);
"#;
        let actual = sqlite_schema_table().to_sql();
        assert_eq!(expected, actual);
    }

    #[test]
    fn test_automatic_index_single_column() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER PRIMARY KEY, b TEXT);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let index = Index::automatic_from_primary_key(&table, "sqlite_autoindex_t1_1", 2)?;

        assert_eq!(index.name, "sqlite_autoindex_t1_1");
        assert_eq!(index.table_name, "t1");
        assert_eq!(index.root_page, 2);
        assert!(index.unique);
        assert_eq!(index.columns.len(), 1);
        assert_eq!(index.columns[0].name, "a");
        assert!(matches!(index.columns[0].order, Order::Ascending));
        Ok(())
    }

    #[test]
    fn test_automatic_index_composite_key() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT, PRIMARY KEY(a, b));"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let index = Index::automatic_from_primary_key(&table, "sqlite_autoindex_t1_1", 2)?;

        assert_eq!(index.name, "sqlite_autoindex_t1_1");
        assert_eq!(index.table_name, "t1");
        assert_eq!(index.root_page, 2);
        assert!(index.unique);
        assert_eq!(index.columns.len(), 2);
        assert_eq!(index.columns[0].name, "a");
        assert_eq!(index.columns[1].name, "b");
        assert!(matches!(index.columns[0].order, Order::Ascending));
        assert!(matches!(index.columns[1].order, Order::Ascending));
        Ok(())
    }

    #[test]
    fn test_automatic_index_no_primary_key() -> Result<()> {
        let sql = r#"CREATE TABLE t1 (a INTEGER, b TEXT);"#;
        let table = BTreeTable::from_sql(sql, 0)?;
        let result = Index::automatic_from_primary_key(&table, "sqlite_autoindex_t1_1", 2);

        assert!(result.is_err());
        assert!(matches!(
            result.unwrap_err(),
            LimboError::InternalError(msg) if msg.contains("without primary key")
        ));
        Ok(())
    }

    #[test]
    fn test_automatic_index_nonexistent_column() -> Result<()> {
        // Create a table with a primary key column that doesn't exist in the table
        let table = BTreeTable {
            root_page: 0,
            name: "t1".to_string(),
            has_rowid: true,
            primary_key_column_names: vec!["nonexistent".to_string()],
            columns: vec![Column {
                name: Some("a".to_string()),
                ty: Type::Integer,
                ty_str: "INT".to_string(),
                primary_key: false,
                is_rowid_alias: false,
                notnull: false,
                default: None,
            }],
        };

        let result = Index::automatic_from_primary_key(&table, "sqlite_autoindex_t1_1", 2);

        assert!(result.is_err());
        assert!(matches!(
            result.unwrap_err(),
            LimboError::InternalError(msg) if msg.contains("not found in table")
        ));
        Ok(())
    }
}
