smart-tree 8.0.1

//! Function Markdown Formatter - Visual function documentation as you work!
//!
//! This formatter creates a beautiful markdown visualization of functions
//! in your codebase, perfect for real-time documentation while coding.
//!
//! Trisha says: "It's like having a living blueprint of your code!" 📐

use crate::formatters::Formatter;
use crate::scanner::{FileNode, TreeStats};
use anyhow::Result;
use std::collections::{HashMap, HashSet};
use std::io::Write;
use std::path::Path;

/// Function information extracted from code
#[derive(Debug, Clone)]
struct FunctionInfo {
    name: String,
    file: String,
    line_start: usize,
    line_end: usize,
    signature: String,
    doc_comment: Option<String>,
    calls: Vec<String>,
    visibility: String,
    complexity: usize,
    language: String,
}

/// Function markdown formatter
pub struct FunctionMarkdownFormatter {
    no_emoji: bool,
    show_private: bool,
    show_complexity: bool,
    show_call_graph: bool,
    group_by_file: bool,
}

impl FunctionMarkdownFormatter {
    pub fn new(show_private: bool, show_complexity: bool, show_call_graph: bool) -> Self {
        Self {
            no_emoji: false,
            show_private,
            show_complexity,
            show_call_graph,
            group_by_file: true,
        }
    }

    /// Extract functions from code files
    fn extract_functions(&self, nodes: &[FileNode]) -> Vec<FunctionInfo> {
        let mut functions = Vec::new();

        for node in nodes {
            if node.is_dir || node.permission_denied {
                continue;
            }

            // Check if it's a code file
            let ext = node.path.extension().and_then(|e| e.to_str()).unwrap_or("");

            if !is_code_extension(ext) {
                continue;
            }

            // For now, create placeholder functions based on file content
            // In a real implementation, we would use tree-sitter or similar
            if let Ok(content) = std::fs::read_to_string(&node.path) {
                let file_functions = extract_functions_from_content(&content, ext);
                for (idx, func_name) in file_functions.into_iter().enumerate() {
                    functions.push(FunctionInfo {
                        name: func_name.clone(),
                        file: node.path.to_string_lossy().to_string(),
                        line_start: idx * 10 + 1,
                        line_end: idx * 10 + 10,
                        signature: format!("{}(...)", func_name),
                        doc_comment: None,
                        calls: Vec::new(),
                        visibility: "public".to_string(),
                        complexity: 5,
                        language: ext.to_string(),
                    });
                }
            }
        }

        functions
    }

    /// Generate the markdown output
    fn generate_markdown(&self, functions: &[FunctionInfo], _stats: &TreeStats) -> String {
        let mut output = String::new();

        // Header
        let doc_title = if self.no_emoji {
            "# Function Documentation\n\n"
        } else {
            "# 📚 Function Documentation\n\n"
        };
        output.push_str(doc_title);
        output.push_str(&format!(
            "*Generated by Smart Tree - {} functions found*\n\n",
            functions.len()
        ));

        // Summary stats
        let summary_title = if self.no_emoji {
            "## Summary\n\n"
        } else {
            "## 📊 Summary\n\n"
        };
        output.push_str(summary_title);
        output.push_str(&format!("- **Total Functions**: {}\n", functions.len()));
        output.push_str(&format!(
            "- **Public Functions**: {}\n",
            functions
                .iter()
                .filter(|f| f.visibility == "public")
                .count()
        ));
        output.push_str(&format!(
            "- **Private Functions**: {}\n",
            functions
                .iter()
                .filter(|f| f.visibility != "public")
                .count()
        ));

        // Language breakdown
        let mut lang_counts: HashMap<String, usize> = HashMap::new();
        for func in functions {
            *lang_counts.entry(func.language.clone()).or_insert(0) += 1;
        }

        let lang_title = if self.no_emoji {
            "\n### Languages\n"
        } else {
            "\n### 🗣️ Languages\n"
        };
        output.push_str(lang_title);
        for (lang, count) in lang_counts.iter() {
            if self.no_emoji {
                output.push_str(&format!("- {}: {} functions\n", lang, count));
            } else {
                let emoji = get_language_emoji(lang);
                output.push_str(&format!("- {} {}: {} functions\n", emoji, lang, count));
            }
        }

        // Table of contents
        let toc_title = if self.no_emoji {
            "\n## Table of Contents\n\n"
        } else {
            "\n## 📑 Table of Contents\n\n"
        };
        output.push_str(toc_title);
        if self.group_by_file {
            let mut files: HashSet<String> = HashSet::new();
            for func in functions {
                files.insert(func.file.clone());
            }

            let mut sorted_files: Vec<String> = files.into_iter().collect();
            sorted_files.sort();

            for file in &sorted_files {
                let file_funcs: Vec<&FunctionInfo> =
                    functions.iter().filter(|f| &f.file == file).collect();

                output.push_str(&format!(
                    "- [{}](#{})\n",
                    file,
                    file.replace(['/', '.'], "-").to_lowercase()
                ));

                for func in &file_funcs {
                    if !self.show_private && func.visibility != "public" {
                        continue;
                    }
                    output.push_str(&format!(
                        "  - [{}()](#{})\n",
                        func.name,
                        format!("{}-{}", file, func.name)
                            .replace('/', "-")
                            .replace('.', "-")
                            .to_lowercase()
                    ));
                }
            }
        }

        // Function details
        let functions_title = if self.no_emoji {
            "\n## Functions\n\n"
        } else {
            "\n## 🔧 Functions\n\n"
        };
        output.push_str(functions_title);

        if self.group_by_file {
            let mut files: HashSet<String> = HashSet::new();
            for func in functions {
                files.insert(func.file.clone());
            }

            let mut sorted_files: Vec<String> = files.into_iter().collect();
            sorted_files.sort();

            for file in sorted_files {
                let file_funcs: Vec<&FunctionInfo> =
                    functions.iter().filter(|f| f.file == file).collect();

                if file_funcs.is_empty() {
                    continue;
                }

                output.push_str(&format!("### 📄 {}\n\n", file));

                for func in file_funcs {
                    if !self.show_private && func.visibility != "public" {
                        continue;
                    }

                    self.format_function(&mut output, func);
                }
            }
        } else {
            // Sort functions by name
            let mut sorted_funcs = functions.to_vec();
            sorted_funcs.sort_by(|a, b| a.name.cmp(&b.name));

            for func in &sorted_funcs {
                if !self.show_private && func.visibility != "public" {
                    continue;
                }

                self.format_function(&mut output, func);
            }
        }

        // Call graph
        if self.show_call_graph {
            output.push_str("\n## 🕸️ Call Graph\n\n");
            output.push_str("```mermaid\ngraph TD\n");

            for func in functions {
                for call in &func.calls {
                    output.push_str(&format!(
                        "    {}[{}] --> {}[{}]\n",
                        func.name, func.name, call, call
                    ));
                }
            }

            output.push_str("```\n");
        }

        // Footer
        output.push_str("\n---\n");
        output.push_str("*Generated by Smart Tree Function Markdown Formatter*\n");
        output.push_str("*\"It's like having a living blueprint of your code!\" - Trisha* 📐\n");

        output
    }

    /// Format a single function
    fn format_function(&self, output: &mut String, func: &FunctionInfo) {
        let visibility_emoji = if func.visibility == "public" {
            "🔓"
        } else {
            "🔒"
        };

        output.push_str(&format!(
            "#### {} {} `{}`\n\n",
            visibility_emoji, func.name, func.visibility
        ));

        // Location
        output.push_str(&format!(
            "📍 **Location**: `{}:{}-{}`\n\n",
            func.file, func.line_start, func.line_end
        ));

        // Signature
        output.push_str("**Signature**:\n```");
        output.push_str(&func.language);
        output.push('\n');
        output.push_str(&func.signature);
        output.push_str("\n```\n\n");

        // Documentation
        if let Some(doc) = &func.doc_comment {
            output.push_str("**Documentation**:\n");
            output.push_str(doc);
            output.push_str("\n\n");
        }

        // Complexity
        if self.show_complexity {
            let complexity_emoji = match func.complexity {
                0..=5 => "🟢",
                6..=10 => "🟡",
                11..=20 => "🟠",
                _ => "🔴",
            };
            output.push_str(&format!(
                "**Complexity**: {} {}\n\n",
                complexity_emoji, func.complexity
            ));
        }

        // Calls
        if !func.calls.is_empty() {
            output.push_str("**Calls**:\n");
            for call in &func.calls {
                output.push_str(&format!("- `{}`\n", call));
            }
            output.push('\n');
        }

        output.push_str("---\n\n");
    }
}

impl Formatter for FunctionMarkdownFormatter {
    fn format(
        &self,
        writer: &mut dyn Write,
        nodes: &[FileNode],
        stats: &TreeStats,
        _root_path: &Path,
    ) -> Result<()> {
        // Extract functions from all code files
        let functions = self.extract_functions(nodes);

        // Generate markdown
        let markdown = self.generate_markdown(&functions, stats);

        // Write output
        writer.write_all(markdown.as_bytes())?;
        Ok(())
    }
}

// Helper functions

fn is_code_extension(ext: &str) -> bool {
    matches!(
        ext,
        "rs" | "py"
            | "js"
            | "ts"
            | "jsx"
            | "tsx"
            | "java"
            | "cpp"
            | "c"
            | "h"
            | "hpp"
            | "go"
            | "rb"
            | "php"
            | "swift"
            | "kt"
            | "scala"
            | "r"
            | "jl"
            | "cs"
            | "vb"
            | "lua"
            | "pl"
            | "sh"
            | "bash"
            | "zsh"
            | "ps1"
            | "dart"
            | "elm"
            | "ex"
            | "exs"
            | "clj"
            | "cljs"
            | "ml"
            | "mli"
    )
}

/// Simple function extraction using regex patterns
fn extract_functions_from_content(content: &str, ext: &str) -> Vec<String> {
    let mut functions = Vec::new();

    let patterns = match ext {
        "rs" => vec![r"fn\s+(\w+)\s*[<(]", r"pub\s+fn\s+(\w+)\s*[<(]"],
        "py" => vec![r"def\s+(\w+)\s*\(", r"async\s+def\s+(\w+)\s*\("],
        "js" | "ts" | "jsx" | "tsx" => vec![
            r"function\s+(\w+)\s*\(",
            r"const\s+(\w+)\s*=\s*\(",
            r"(\w+)\s*:\s*function\s*\(",
            r"(\w+)\s*\(.*\)\s*\{",
        ],
        "java" => vec![
            r"(?:public|private|protected)\s+\w+\s+(\w+)\s*\(",
            r"\b(\w+)\s*\(.*\)\s*\{",
        ],
        "go" => vec![r"func\s+(\w+)\s*\(", r"func\s+\(.*\)\s+(\w+)\s*\("],
        "cpp" | "c" | "hpp" | "h" => vec![r"\b(\w+)\s*\(.*\)\s*\{", r"\b(\w+)\s*\(.*\);$"],
        _ => vec![],
    };

    for pattern in patterns {
        if let Ok(re) = regex::Regex::new(pattern) {
            for cap in re.captures_iter(content) {
                if let Some(name) = cap.get(1) {
                    let func_name = name.as_str().to_string();
                    if !functions.contains(&func_name) && is_valid_function_name(&func_name) {
                        functions.push(func_name);
                    }
                }
            }
        }
    }

    functions
}

/// Check if a name is likely a function name
fn is_valid_function_name(name: &str) -> bool {
    // Filter out common false positives
    !matches!(
        name,
        "if" | "for" | "while" | "switch" | "catch" | "return" | "import" | "export"
    ) && name.len() > 1
        && !name.chars().all(|c| c.is_uppercase())
}

fn get_language_emoji(lang: &str) -> &'static str {
    match lang {
        "rs" => "🦀",
        "py" => "🐍",
        "js" | "ts" | "jsx" | "tsx" => "📜",
        "java" => "☕",
        "go" => "🐹",
        "rb" => "💎",
        "php" => "🐘",
        "swift" => "🦉",
        "cpp" | "c" | "h" | "hpp" => "⚙️",
        _ => "📄",
    }
}