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use crate::{
    sqlite::{
        schema::field::Field,
        types::{
            SimpleSimpleType,
            Type,
            SimpleType,
        },
    },
    break_shed,
};
use super::expr::{
    Expr,
    BinOp,
    ComputeType,
};

/// Generates a field element for instert and update statements, to set a field
/// from a parameter of the same type.
pub fn set_field(param_name: impl Into<String>, f: &Field) -> (Field, Expr) {
    (f.clone(), field_param(param_name, f))
}

/// Generates a param matching a field in name in type
pub fn field_param(param_name: impl Into<String>, f: &Field) -> Expr {
    Expr::Param {
        name: param_name.into(),
        type_: f.type_.type_.clone(),
    }
}

/// Generates an expression checking for equality of a field and a parameter and
/// the same type.
pub fn eq_field(param_name: impl Into<String>, f: &Field) -> Expr {
    Expr::BinOp {
        left: Box::new(Expr::Field(f.clone())),
        op: BinOp::Equals,
        right: Box::new(Expr::Param {
            name: param_name.into(),
            type_: f.type_.type_.clone(),
        }),
    }
}

/// Generates an expression selecting field values greater than a corresponding
/// parameter
pub fn gt_field(param_name: impl Into<String>, f: &Field) -> Expr {
    Expr::BinOp {
        left: Box::new(Expr::Field(f.clone())),
        op: BinOp::GreaterThan,
        right: Box::new(Expr::Param {
            name: param_name.into(),
            type_: f.type_.type_.clone(),
        }),
    }
}

/// Generates an expression selecting field values greater than or equal to a
/// corresponding parameter
pub fn gte_field(param_name: impl Into<String>, f: &Field) -> Expr {
    Expr::BinOp {
        left: Box::new(Expr::Field(f.clone())),
        op: BinOp::GreaterThanEqualTo,
        right: Box::new(Expr::Param {
            name: param_name.into(),
            type_: f.type_.type_.clone(),
        }),
    }
}

/// Generates an expression selecting field values greater than a corresponding
/// parameter
pub fn lt_field(param_name: impl Into<String>, f: &Field) -> Expr {
    Expr::BinOp {
        left: Box::new(Expr::Field(f.clone())),
        op: BinOp::LessThan,
        right: Box::new(Expr::Param {
            name: param_name.into(),
            type_: f.type_.type_.clone(),
        }),
    }
}

/// Generates an expression selecting field values greater than or equal to a
/// corresponding parameter
pub fn lte_field(param_name: impl Into<String>, f: &Field) -> Expr {
    Expr::BinOp {
        left: Box::new(Expr::Field(f.clone())),
        op: BinOp::LessThanEqualTo,
        right: Box::new(Expr::Param {
            name: param_name.into(),
            type_: f.type_.type_.clone(),
        }),
    }
}

/// Shortcut for AND expressions.
pub fn expr_and(exprs: Vec<Expr>) -> Expr {
    Expr::BinOpChain {
        op: BinOp::And,
        exprs: exprs,
    }
}

pub fn as_utc(expr: Expr) -> Expr {
    return Expr::Call {
        func: "strftime".to_string(),
        args: vec![Expr::LitString("%Y-%m-%dT%H:%M:%f".to_string()), expr],
        compute_type: ComputeType::new(|ctx, path, args| {
            break_shed!{
                let arg = args.get(1).unwrap();
                let Some(type_) = arg.0.iter().next() else {
                    break;
                };
                if !matches!(type_.1.type_.type_, SimpleSimpleType::FixedOffsetTimeMs) {
                    ctx
                        .errs
                        .err(
                            path,
                            format!(
                                "This method only operates on fixed-offset timestamps, but the argument is of type {:?}",
                                type_.1.type_.type_
                            ),
                        );
                }
            };

            return Some(Type {
                type_: SimpleType {
                    type_: SimpleSimpleType::UtcTimeMs,
                    custom: None,
                },
                opt: false,
            });
        }),
    }
}