use biome_analyze::context::RuleContext;
use biome_analyze::{declare_rule, ActionCategory, FixKind, Rule, RuleDiagnostic};
use biome_console::markup;
use biome_diagnostics::Applicability;
use biome_js_factory::make;
use biome_js_semantic::SemanticModel;
use biome_js_syntax::{
    global_identifier, AnyJsCallArgument, AnyJsExpression, AnyJsMemberExpression,
    JsBinaryExpression, JsBinaryOperator, JsCaseClause, JsSwitchStatement, TextRange, T,
};
use biome_rowan::{declare_node_union, AstNode, BatchMutationExt};

use crate::{semantic_services::Semantic, JsRuleAction};

declare_rule! {
    /// Require calls to `isNaN()` when checking for `NaN`.
    ///
    /// In JavaScript, `NaN` is a special value of the `Number` type.
    /// It’s used to represent any of the "not-a-number" values represented by the double-precision 64-bit format as specified by the IEEE Standard for Binary Floating-Point Arithmetic.
    ///
    /// Because `NaN` is unique in JavaScript by not being equal to anything, including itself, the results of comparisons to `NaN` are confusing:
    /// - `NaN` === `NaN` or `NaN` == `NaN` evaluate to false
    /// - `NaN` !== `NaN` or `NaN` != `NaN` evaluate to true
    ///
    /// Therefore, use `Number.isNaN()` or global `isNaN()` functions to test whether a value is `NaN`.
    ///
    /// Note that `Number.isNaN()` and `isNaN()` [have not the same behavior](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN#description).
    /// When the argument to `isNaN()` is not a number, the value is first coerced to a number.
    /// `Number.isNaN()` does not perform this coercion.
    /// Therefore, it is a more reliable way to test whether a value is `NaN`.
    ///
    /// Source: [use-isnan](https://eslint.org/docs/latest/rules/use-isnan).
    ///
    /// ## Examples
    ///
    /// ### Invalid
    ///
    /// ```js,expect_diagnostic
    /// 123 == NaN
    /// ```
    ///
    /// ```js,expect_diagnostic
    /// 123 != NaN
    /// ```
    ///
    /// ```js,expect_diagnostic
    /// switch(foo) { case (NaN): break; }
    /// ```
    ///
    /// ```js,expect_diagnostic
    /// Number.NaN == "abc"
    /// ```
    ///
    /// ### Valid
    ///
    /// ```js
    /// if (Number.isNaN(123) !== true) {}
    ///
    /// foo(Number.NaN / 2)
    ///
    /// switch(foo) {}
    /// ```
    ///
    pub(crate) UseIsNan {
        version: "1.0.0",
        name: "useIsNan",
        recommended: true,
        fix_kind: FixKind::Unsafe,
    }
}

declare_node_union! {
    pub(crate) UseIsNanQuery = JsBinaryExpression | JsCaseClause | JsSwitchStatement
}

enum Message {
    BinaryExpression,
    CaseClause,
    SwitchCase,
}

pub struct RuleState {
    range: TextRange,
    message_id: Message,
}

impl Message {
    fn as_str(&self) -> &str {
        match self {
			Self::BinaryExpression => "Use the Number.isNaN function to compare with NaN.",
			Self::CaseClause => "'case NaN' can never match. Use Number.isNaN before the switch.",
			Self::SwitchCase => "'switch(NaN)' can never match a case clause. Use Number.isNaN instead of the switch."
		}
    }
}

impl Rule for UseIsNan {
    type Query = Semantic<UseIsNanQuery>;
    type State = RuleState;
    type Signals = Option<Self::State>;
    type Options = ();

    fn run(ctx: &RuleContext<Self>) -> Self::Signals {
        let node = ctx.query();
        let model = ctx.model();

        match node {
            UseIsNanQuery::JsBinaryExpression(bin_expr) => {
                if bin_expr.is_comparison_operator()
                    && (has_nan(bin_expr.left().ok()?, model)
                        || has_nan(bin_expr.right().ok()?, model))
                {
                    return Some(RuleState {
                        message_id: Message::BinaryExpression,
                        range: bin_expr.range(),
                    });
                }
            }
            UseIsNanQuery::JsCaseClause(case_clause) => {
                let test = case_clause.test().ok()?;
                let range = test.range();
                if has_nan(test, model) {
                    return Some(RuleState {
                        message_id: Message::CaseClause,
                        range,
                    });
                }
            }
            UseIsNanQuery::JsSwitchStatement(switch_stmt) => {
                let discriminant = switch_stmt.discriminant().ok()?;
                let range = discriminant.range();
                if has_nan(discriminant, model) {
                    return Some(RuleState {
                        message_id: Message::SwitchCase,
                        range,
                    });
                }
            }
        }
        None
    }

    fn diagnostic(_: &RuleContext<Self>, state: &Self::State) -> Option<RuleDiagnostic> {
        Some(RuleDiagnostic::new(
            rule_category!(),
            state.range,
            state.message_id.as_str(),
        ))
    }

    fn action(ctx: &RuleContext<Self>, _: &Self::State) -> Option<JsRuleAction> {
        let query = ctx.query();
        let model = ctx.model();
        let mut mutation = ctx.root().begin();

        match query {
            UseIsNanQuery::JsBinaryExpression(binary_expression) => {
                let has_nan = binary_expression.is_comparison_operator()
                    && (has_nan(binary_expression.left().ok()?, model)
                        || has_nan(binary_expression.right().ok()?, model));

                if !has_nan {
                    return None;
                }

                let (literal, nan) = get_literal(binary_expression, model)?;
                let with_inequality = contains_inequality(binary_expression).unwrap_or(false);
                let is_nan_expression: AnyJsExpression = create_is_nan_expression(nan)
                    .and_then(|result| create_unary_expression(with_inequality, result))?;

                let arg = AnyJsCallArgument::AnyJsExpression(literal);
                let args = make::js_call_arguments(
                    make::token(T!['(']),
                    make::js_call_argument_list([arg], []),
                    make::token(T![')']),
                );

                let call = make::js_call_expression(is_nan_expression, args).build();

                mutation.replace_node(
                    AnyJsExpression::JsBinaryExpression(binary_expression.clone()),
                    call.into(),
                );

                return Some(JsRuleAction {
                    category: ActionCategory::QuickFix,
                    applicability: Applicability::MaybeIncorrect,
                    message: markup! {
                        "Use "<Emphasis>"Number.isNaN()"</Emphasis>" instead."
                    }
                    .to_owned(),
                    mutation,
                });
            }
            UseIsNanQuery::JsCaseClause(_) => None,
            UseIsNanQuery::JsSwitchStatement(_) => None,
        }
    }
}

fn create_unary_expression(
    with_inequality: bool,
    nan_expression: AnyJsExpression,
) -> Option<AnyJsExpression> {
    if with_inequality {
        let unary = make::js_unary_expression(make::token(T![!]), nan_expression);
        return Some(unary.into());
    }

    Some(nan_expression)
}

fn create_is_nan_expression(nan: AnyJsExpression) -> Option<AnyJsExpression> {
    match nan {
        AnyJsExpression::JsIdentifierExpression(_)
        | AnyJsExpression::JsComputedMemberExpression(_) => {
            let is_nan_expression = make::js_static_member_expression(
                make::js_identifier_expression(make::js_reference_identifier(make::ident(
                    "Number",
                )))
                .into(),
                make::token(T![.]),
                make::js_name(make::ident("isNaN")).into(),
            );

            Some(is_nan_expression.into())
        }
        AnyJsExpression::JsStaticMemberExpression(member_expression) => {
            let is_nan_expression =
                member_expression.with_member(make::js_name(make::ident("isNaN")).into());
            let member_object = is_nan_expression.object().ok()?.omit_parentheses();
            let (reference, _) = global_identifier(&member_object)?;
            let number_identifier_exists = is_nan_expression
                .object()
                .ok()?
                .as_js_static_member_expression()
                .is_some_and(|y| y.member().is_ok_and(|z| z.text() == "Number"));

            if !reference.is_global_this() && !reference.has_name("window")
                || number_identifier_exists
            {
                return Some(is_nan_expression.into());
            }

            let member_expression = make::js_static_member_expression(
                is_nan_expression.object().ok()?,
                make::token(T![.]),
                make::js_name(make::ident("Number")).into(),
            );

            Some(
                is_nan_expression
                    .with_object(member_expression.into())
                    .into(),
            )
        }
        _ => None,
    }
}

fn contains_inequality(bin_expr: &JsBinaryExpression) -> Option<bool> {
    Some(matches!(
        bin_expr.operator().ok()?,
        JsBinaryOperator::Inequality | JsBinaryOperator::StrictInequality
    ))
}

fn get_literal(
    bin_expr: &JsBinaryExpression,
    model: &SemanticModel,
) -> Option<(AnyJsExpression, AnyJsExpression)> {
    let left_expression = bin_expr.left().ok()?;
    let right_expression = bin_expr.right().ok()?;
    let is_nan_on_left = has_nan(left_expression.clone(), model);

    let left = left_expression
        .with_leading_trivia_pieces([])?
        .with_trailing_trivia_pieces([])?;
    let right = right_expression
        .with_leading_trivia_pieces([])?
        .with_trailing_trivia_pieces([])?;

    if !is_nan_on_left {
        Some((left, right))
    } else {
        Some((right, left))
    }
}

/// Checks whether an expression has `NaN`, `Number.NaN`, or `Number['NaN']`.
fn has_nan(expr: AnyJsExpression, model: &SemanticModel) -> bool {
    (|| {
        let expr = expr.omit_parentheses();
        let reference = if let Some((reference, name)) = global_identifier(&expr) {
            if name.text() != "NaN" {
                return None;
            }
            reference
        } else {
            let member_expr = AnyJsMemberExpression::cast_ref(expr.syntax())?;
            if member_expr.member_name()?.text() != "NaN" {
                return None;
            }
            let member_object = member_expr.object().ok()?.omit_parentheses();
            let (reference, name) = global_identifier(&member_object.omit_parentheses())?;
            if name.text() != "Number" {
                return None;
            }
            reference
        };
        model.binding(&reference).is_none().then_some(())
    })()
    .is_some()
}