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use crate::linter::{Rule, RuleResult};
use sv_parser::{NodeEvent, RefNode, SyntaxTree};

#[derive(Default)]
pub struct GenerateKeywordRequired {
    generate_region: Vec<()>,
}

impl Rule for GenerateKeywordRequired {
    fn check(&mut self, _syntax_tree: &SyntaxTree, event: &NodeEvent) -> RuleResult {
        match event {
            NodeEvent::Enter(RefNode::GenerateRegion(_)) => {
                self.generate_region.push(());
                RuleResult::Pass
            }
            NodeEvent::Leave(RefNode::GenerateRegion(_)) => {
                self.generate_region.pop();
                RuleResult::Pass
            }
            NodeEvent::Enter(RefNode::IfGenerateConstruct(_)) => {
                if self.generate_region.last().is_some() {
                    RuleResult::Pass
                } else {
                    RuleResult::Fail
                }
            }
            NodeEvent::Enter(RefNode::CaseGenerateConstruct(_)) => {
                if self.generate_region.last().is_some() {
                    RuleResult::Pass
                } else {
                    RuleResult::Fail
                }
            }
            NodeEvent::Enter(RefNode::LoopGenerateConstruct(_)) => {
                if self.generate_region.last().is_some() {
                    RuleResult::Pass
                } else {
                    RuleResult::Fail
                }
            }
            _ => RuleResult::Pass,
        }
    }

    fn name(&self) -> String {
        String::from("generate_keyword_required")
    }

    fn hint(&self) -> String {
        String::from("`generate`/`endgenerate` is required")
    }

    fn reason(&self) -> String {
        String::from("some tools don't support `generate`/`endgenerate` omitting")
    }
}