"""
Notes & Files Tool - Manage notes and search files.
"""

import re
from datetime import datetime
from pathlib import Path
from typing import Any, Dict, List, Optional
from tools.base import BaseTool

# Path whitelist - only allow notes in home directory
NOTES_DIR = Path(__file__).parent.parent.parent / "data" / "notes" / "home"
FORBIDDEN_PATTERNS = ["work", "atlas/code", "projects"]  # Safety: reject paths containing these


def _validate_path(path: Path) -> bool:
    """Validate that path is within allowed directory and doesn't contain forbidden patterns."""
    path = path.resolve()
    notes_dir = NOTES_DIR.resolve()
    
    # Must be within notes directory
    try:
        path.relative_to(notes_dir)
    except ValueError:
        return False
    
    # Check for forbidden patterns
    path_str = str(path).lower()
    for pattern in FORBIDDEN_PATTERNS:
        if pattern in path_str:
            return False
    
    return True


def _ensure_notes_dir():
    """Ensure notes directory exists."""
    NOTES_DIR.mkdir(parents=True, exist_ok=True)


def _sanitize_filename(name: str) -> str:
    """Convert note name to safe filename."""
    filename = re.sub(r'[^\w\s-]', '', name)
    filename = re.sub(r'\s+', '-', filename)
    filename = filename[:50]
    return filename.lower()


def _search_in_file(file_path: Path, query: str) -> bool:
    """Check if query matches file content (case-insensitive)."""
    try:
        content = file_path.read_text().lower()
        return query.lower() in content
    except Exception:
        return False


class CreateNoteTool(BaseTool):
    """Tool for creating new notes."""
    
    @property
    def name(self) -> str:
        return "create_note"
    
    @property
    def description(self) -> str:
        return "Create a new note file. Returns the file path."
    
    def get_schema(self) -> Dict[str, Any]:
        """Get tool schema."""
        return {
            "name": self.name,
            "description": self.description,
            "inputSchema": {
                "type": "object",
                "properties": {
                    "title": {
                        "type": "string",
                        "description": "Note title (used for filename)"
                    },
                    "content": {
                        "type": "string",
                        "description": "Note content (Markdown supported)"
                    }
                },
                "required": ["title"]
            }
        }
    
    def execute(self, arguments: Dict[str, Any]) -> str:
        """Execute create_note tool."""
        _ensure_notes_dir()
        
        title = arguments.get("title", "").strip()
        if not title:
            raise ValueError("Missing required argument: title")
        
        content = arguments.get("content", "").strip()
        
        # Generate filename
        filename = _sanitize_filename(title)
        file_path = NOTES_DIR / f"{filename}.md"
        
        # Ensure unique filename
        counter = 1
        while file_path.exists():
            file_path = NOTES_DIR / f"{filename}-{counter}.md"
            counter += 1
        
        if not _validate_path(file_path):
            raise ValueError(f"Path not allowed: {file_path}")
        
        # Write note file
        note_content = f"# {title}\n\n"
        if content:
            note_content += content + "\n"
        note_content += f"\n---\n*Created: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}*\n"
        
        file_path.write_text(note_content)
        
        return f"Note '{title}' created at {file_path.relative_to(NOTES_DIR.parent.parent.parent)}"


class ReadNoteTool(BaseTool):
    """Tool for reading note files."""
    
    @property
    def name(self) -> str:
        return "read_note"
    
    @property
    def description(self) -> str:
        return "Read the content of a note file. Provide filename (with or without .md extension) or relative path."
    
    def get_schema(self) -> Dict[str, Any]:
        """Get tool schema."""
        return {
            "name": self.name,
            "description": self.description,
            "inputSchema": {
                "type": "object",
                "properties": {
                    "filename": {
                        "type": "string",
                        "description": "Note filename (e.g., 'my-note' or 'my-note.md')"
                    }
                },
                "required": ["filename"]
            }
        }
    
    def execute(self, arguments: Dict[str, Any]) -> str:
        """Execute read_note tool."""
        _ensure_notes_dir()
        
        filename = arguments.get("filename", "").strip()
        if not filename:
            raise ValueError("Missing required argument: filename")
        
        # Add .md extension if not present
        if not filename.endswith(".md"):
            filename += ".md"
        
        # Try to find file
        file_path = NOTES_DIR / filename
        
        if not _validate_path(file_path):
            raise ValueError(f"Path not allowed: {file_path}")
        
        if not file_path.exists():
            # Try to find by partial match
            matching_files = list(NOTES_DIR.glob(f"*{filename}*"))
            if len(matching_files) == 1:
                file_path = matching_files[0]
            elif len(matching_files) > 1:
                return f"Multiple files match '{filename}': {', '.join(f.name for f in matching_files)}"
            else:
                raise ValueError(f"Note not found: {filename}")
        
        try:
            content = file_path.read_text()
            return f"**{file_path.stem}**\n\n{content}"
        except Exception as e:
            raise ValueError(f"Error reading note: {e}")


class AppendToNoteTool(BaseTool):
    """Tool for appending content to existing notes."""
    
    @property
    def name(self) -> str:
        return "append_to_note"
    
    @property
    def description(self) -> str:
        return "Append content to an existing note file."
    
    def get_schema(self) -> Dict[str, Any]:
        """Get tool schema."""
        return {
            "name": self.name,
            "description": self.description,
            "inputSchema": {
                "type": "object",
                "properties": {
                    "filename": {
                        "type": "string",
                        "description": "Note filename (e.g., 'my-note' or 'my-note.md')"
                    },
                    "content": {
                        "type": "string",
                        "description": "Content to append"
                    }
                },
                "required": ["filename", "content"]
            }
        }
    
    def execute(self, arguments: Dict[str, Any]) -> str:
        """Execute append_to_note tool."""
        _ensure_notes_dir()
        
        filename = arguments.get("filename", "").strip()
        content = arguments.get("content", "").strip()
        
        if not filename:
            raise ValueError("Missing required argument: filename")
        
        if not content:
            raise ValueError("Missing required argument: content")
        
        # Add .md extension if not present
        if not filename.endswith(".md"):
            filename += ".md"
        
        file_path = NOTES_DIR / filename
        
        if not _validate_path(file_path):
            raise ValueError(f"Path not allowed: {file_path}")
        
        if not file_path.exists():
            raise ValueError(f"Note not found: {filename}")
        
        try:
            # Read existing content
            existing = file_path.read_text()
            
            # Append new content
            updated = existing.rstrip() + f"\n\n{content}\n"
            updated += f"\n---\n*Updated: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}*\n"
            
            file_path.write_text(updated)
            return f"Content appended to '{file_path.stem}'"
        except Exception as e:
            raise ValueError(f"Error appending to note: {e}")


class SearchNotesTool(BaseTool):
    """Tool for searching notes by content."""
    
    @property
    def name(self) -> str:
        return "search_notes"
    
    @property
    def description(self) -> str:
        return "Search notes by content (full-text search). Returns matching notes with excerpts."
    
    def get_schema(self) -> Dict[str, Any]:
        """Get tool schema."""
        return {
            "name": self.name,
            "description": self.description,
            "inputSchema": {
                "type": "object",
                "properties": {
                    "query": {
                        "type": "string",
                        "description": "Search query (searches in note content)"
                    },
                    "limit": {
                        "type": "integer",
                        "description": "Maximum number of results",
                        "default": 10
                    }
                },
                "required": ["query"]
            }
        }
    
    def execute(self, arguments: Dict[str, Any]) -> str:
        """Execute search_notes tool."""
        _ensure_notes_dir()
        
        query = arguments.get("query", "").strip()
        if not query:
            raise ValueError("Missing required argument: query")
        
        limit = arguments.get("limit", 10)
        
        # Search all markdown files
        matches = []
        for file_path in NOTES_DIR.glob("*.md"):
            if not _validate_path(file_path):
                continue
            
            try:
                if _search_in_file(file_path, query):
                    content = file_path.read_text()
                    # Extract excerpt (first 200 chars containing query)
                    query_lower = query.lower()
                    content_lower = content.lower()
                    idx = content_lower.find(query_lower)
                    if idx >= 0:
                        start = max(0, idx - 50)
                        end = min(len(content), idx + len(query) + 150)
                        excerpt = content[start:end]
                        if start > 0:
                            excerpt = "..." + excerpt
                        if end < len(content):
                            excerpt = excerpt + "..."
                    else:
                        excerpt = content[:200] + "..."
                    
                    matches.append({
                        "filename": file_path.stem,
                        "excerpt": excerpt
                    })
            except Exception:
                continue
        
        if not matches:
            return f"No notes found matching '{query}'."
        
        # Limit results
        matches = matches[:limit]
        
        # Format output
        result = f"Found {len(matches)} note(s) matching '{query}':\n\n"
        for match in matches:
            result += f"**{match['filename']}**\n"
            result += f"{match['excerpt']}\n\n"
        
        return result.strip()


class ListNotesTool(BaseTool):
    """Tool for listing all notes."""
    
    @property
    def name(self) -> str:
        return "list_notes"
    
    @property
    def description(self) -> str:
        return "List all available notes."
    
    def get_schema(self) -> Dict[str, Any]:
        """Get tool schema."""
        return {
            "name": self.name,
            "description": self.description,
            "inputSchema": {
                "type": "object",
                "properties": {
                    "limit": {
                        "type": "integer",
                        "description": "Maximum number of notes to list",
                        "default": 20
                    }
                }
            }
        }
    
    def execute(self, arguments: Dict[str, Any]) -> str:
        """Execute list_notes tool."""
        _ensure_notes_dir()
        
        limit = arguments.get("limit", 20)
        
        notes = []
        for file_path in sorted(NOTES_DIR.glob("*.md")):
            if not _validate_path(file_path):
                continue
            
            try:
                # Get first line (title) if possible
                content = file_path.read_text()
                first_line = content.split("\n")[0] if content else file_path.stem
                if first_line.startswith("#"):
                    title = first_line[1:].strip()
                else:
                    title = file_path.stem
                
                notes.append({
                    "filename": file_path.stem,
                    "title": title
                })
            except Exception:
                notes.append({
                    "filename": file_path.stem,
                    "title": file_path.stem
                })
        
        if not notes:
            return "No notes found."
        
        notes = notes[:limit]
        
        result = f"Found {len(notes)} note(s):\n\n"
        for note in notes:
            result += f"- **{note['title']}** (`{note['filename']}.md`)\n"
        
        return result.strip()