nargo-coverage 0.0.0

#![warn(missing_docs)]

use nargo_types::{Result, Span};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;

/// 代码覆盖率元数据
#[derive(Debug, Clone, Serialize, Deserialize, Default)]
pub struct CoverageMetadata {
    /// 文件路径
    pub file_path: String,
    /// 语句映射
    pub statement_map: HashMap<usize, Span>,
    /// 分支映射
    pub branch_map: HashMap<usize, BranchMetadata>,
    /// 函数映射
    pub function_map: HashMap<usize, FunctionMetadata>,
    /// 语句命中计数
    pub s: HashMap<usize, u32>,
    /// 分支命中计数
    pub b: HashMap<usize, Vec<u32>>,
    /// 函数命中计数
    pub f: HashMap<usize, u32>,
}

/// 分支元数据
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct BranchMetadata {
    /// 行号
    pub line: usize,
    /// 分支类型
    pub r#type: String,
    /// 分支位置
    pub locations: Vec<Span>,
}

/// 函数元数据
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct FunctionMetadata {
    /// 函数名称
    pub name: String,
    /// 行号
    pub line: usize,
    /// 位置范围
    pub span: Span,
}

/// 代码覆盖率插桩器
pub struct CoverageInstrumenter {
    file_id: String,
    next_stmt_id: usize,
    metadata: CoverageMetadata,
}

impl CoverageInstrumenter {
    /// 创建一个新的覆盖率插桩器
    pub fn new(file_id: String, file_path: String) -> Self {
        Self { file_id, next_stmt_id: 0, metadata: CoverageMetadata { file_path, ..Default::default() } }
    }

    /// 对模块进行覆盖率插桩
    pub fn instrument(&mut self, _module: &mut ()) -> Result<CoverageMetadata> {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
        Ok(self.metadata.clone())
    }

    fn instrument_program(&mut self, _program: &mut ()) {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
    }

    fn instrument_stmt(&mut self, _stmt: ()) -> () {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
    }

    fn instrument_expr(&mut self, _expr: &mut ()) {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
    }

    fn instrument_template(&mut self, _template: &mut ()) {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
    }

    fn instrument_template_node(&mut self, _node: &mut ()) {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
    }

    fn next_id(&mut self) -> usize {
        let id = self.next_stmt_id;
        self.next_stmt_id += 1;
        id
    }

    fn create_counter_stmt(&self, _id: usize) -> () {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
    }

    fn create_branch_counter_expr(&self, _bid: usize, _index: usize) -> () {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
    }

    fn create_function_counter_stmt(&self, _fid: usize) -> () {
        // 简化实现，实际需要根据 nargo_types 的 API 进行调整
    }
}

/// LCOV 格式报告生成器
pub struct LcovReporter;

impl LcovReporter {
    /// 生成 LCOV 格式的覆盖率报告
    pub fn report(metadatas: &[CoverageMetadata]) -> String {
        let mut out = String::new();
        for meta in metadatas {
            out.push_str(&format!("TN:\nSF:{}\n", meta.file_path));

            for (id, func) in &meta.function_map {
                let hits = meta.f.get(id).cloned().unwrap_or(0);
                out.push_str(&format!("FN:{},{}\n", func.line, func.name));
                out.push_str(&format!("FNDA:{},{}\n", hits, func.name));
            }
            out.push_str(&format!("FNF:{}\n", meta.function_map.len()));
            out.push_str(&format!("FNH:{}\n", meta.f.values().filter(|&&h| h > 0).count()));

            let mut line_hits: HashMap<u32, u32> = HashMap::new();
            for (id, span) in &meta.statement_map {
                let hits = meta.s.get(id).cloned().unwrap_or(0);
                let line = span.start.line;
                let entry = line_hits.entry(line).or_insert(0);
                *entry = (*entry).max(hits);
            }

            let mut lines: Vec<_> = line_hits.keys().collect();
            lines.sort();
            for &line in lines {
                let hits = line_hits[&line];
                out.push_str(&format!("DA:{},{}\n", line, hits));
            }

            out.push_str(&format!("LF:{}\n", line_hits.len()));
            out.push_str(&format!("LH:{}\n", line_hits.values().filter(|&&h| h > 0).count()));

            let mut branch_count = 0;
            let mut branch_hit = 0;
            for (bid, branch) in &meta.branch_map {
                let hits = meta.b.get(bid);
                for (idx, &h) in hits.map(|v| v.as_slice()).unwrap_or(&[]).iter().enumerate() {
                    out.push_str(&format!("BRDA:{},0,{},{}\n", branch.line, idx, if h > 0 { h.to_string() } else { "-".to_string() }));
                    branch_count += 1;
                    if h > 0 {
                        branch_hit += 1;
                    }
                }
            }
            out.push_str(&format!("BRF:{}\n", branch_count));
            out.push_str(&format!("BRH:{}\n", branch_hit));

            out.push_str("end_of_record\n");
        }
        out
    }
}