#!/usr/bin/env python3
"""
Generate API documentation from docstrings.

Usage:
    python scripts/generate_docs.py

Generates docs/api-reference.md from source code docstrings.
"""

import ast
import inspect
from pathlib import Path
from typing import List, Tuple


def extract_class_info(class_node: ast.ClassDef, source_lines: List[str]) -> dict:
    """Extract class information including docstring and methods."""
    info = {
        "name": class_node.name,
        "docstring": ast.get_docstring(class_node) or "",
        "methods": [],
    }
    
    for node in class_node.body:
        if isinstance(node, ast.FunctionDef) and not node.name.startswith("_"):
            method_info = {
                "name": node.name,
                "docstring": ast.get_docstring(node) or "",
                "args": [],
                "returns": "",
            }
            
            # Extract arguments
            for arg in node.args.args:
                if arg.arg not in ("self", "cls"):
                    method_info["args"].append(arg.arg)
            
            info["methods"].append(method_info)
    
    return info


def parse_module(file_path: Path) -> List[dict]:
    """Parse Python module and extract classes with methods."""
    source = file_path.read_text()
    source_lines = source.splitlines()
    tree = ast.parse(source)
    
    classes = []
    for node in ast.walk(tree):
        if isinstance(node, ast.ClassDef):
            classes.append(extract_class_info(node, source_lines))
    
    return classes


def generate_api_reference(src_dir: Path, output_path: Path):
    """Generate API reference markdown from source code."""
    
    # Parse client.py
    client_path = src_dir / "client.py"
    classes = parse_module(client_path)
    
    # Generate markdown
    md_lines = [
        "# API Reference",
        "",
        "Auto-generated API documentation.",
        "",
        "Last updated: " + Path().cwd().name,  # Will be updated with date
        "",
        "---",
        "",
    ]
    
    for cls in classes:
        if not cls["docstring"]:
            continue
        
        md_lines.append(f"## {cls['name']}")
        md_lines.append("")
        md_lines.append(cls["docstring"])
        md_lines.append("")
        
        if cls["methods"]:
            md_lines.append("### Methods")
            md_lines.append("")
            
            for method in cls["methods"]:
                args_str = ", ".join(method["args"])
                md_lines.append(f"#### `{method['name']}({args_str})`")
                md_lines.append("")
                
                if method["docstring"]:
                    md_lines.append(method["docstring"])
                    md_lines.append("")
            
            md_lines.append("")
        
        md_lines.append("---")
        md_lines.append("")
    
    # Parse models.py
    models_path = src_dir / "models.py"
    if models_path.exists():
        model_classes = parse_module(models_path)
        
        md_lines.append("")
        md_lines.append("# Models")
        md_lines.append("")
        md_lines.append("Pydantic models used in API responses.")
        md_lines.append("")
        
        for cls in model_classes:
            if cls["name"].startswith("_"):
                continue
            
            md_lines.append(f"## {cls['name']}")
            md_lines.append("")
            
            if cls["docstring"]:
                md_lines.append(cls["docstring"])
                md_lines.append("")
            
            # Show fields
            md_lines.append("### Fields")
            md_lines.append("")
            md_lines.append("| Field | Type | Description |")
            md_lines.append("|-------|------|-------------|")
            
            # Extract fields from class body
            for node in ast.walk(ast.parse(models_path.read_text())):
                if isinstance(node, ast.ClassDef) and node.name == cls["name"]:
                    for item in node.body:
                        if isinstance(item, ast.AnnAssign) and isinstance(item.target, ast.Name):
                            field_name = item.target.id
                            if not field_name.startswith("_"):
                                md_lines.append(f"| `{field_name}` | - | - |")
            
            md_lines.append("")
            md_lines.append("---")
            md_lines.append("")
    
    # Parse errors.py
    errors_path = src_dir / "errors.py"
    if errors_path.exists():
        error_classes = parse_module(errors_path)
        
        md_lines.append("")
        md_lines.append("# Errors")
        md_lines.append("")
        md_lines.append("Exception classes for error handling.")
        md_lines.append("")
        
        for cls in error_classes:
            if cls["name"].startswith("_"):
                continue
            
            md_lines.append(f"## {cls['name']}")
            md_lines.append("")
            
            if cls["docstring"]:
                md_lines.append(cls["docstring"])
                md_lines.append("")
            
            md_lines.append("---")
            md_lines.append("")
    
    # Write output
    output_path.parent.mkdir(parents=True, exist_ok=True)
    output_path.write_text("\n".join(md_lines))
    print(f"✅ Generated {output_path}")


def main():
    """Main entry point."""
    import sys
    
    # Paths
    root_dir = Path(__file__).parent.parent
    src_dir = root_dir / "src" / "kwork_api"
    output_path = root_dir / "docs" / "api-reference.md"
    
    if not src_dir.exists():
        print(f"❌ Source directory not found: {src_dir}")
        sys.exit(1)
    
    generate_api_reference(src_dir, output_path)


if __name__ == "__main__":
    main()