"""
VS Code / Monaco Editor Integration API Router

Provides code editing capabilities:
- File editing with syntax highlighting
- Project file tree
- Code snippets
- Language server features
"""

from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from typing import List, Optional
from datetime import datetime

from ..database import get_db
from ..auth import get_current_user
from ..models import User, File, Folder
from pydantic import BaseModel

router = APIRouter(prefix="/api/vscode", tags=["vscode"])


class CodeFile(BaseModel):
    name: str
    path: str
    content: str
    language: str = "plaintext"
    folder_id: Optional[int] = None


class CodeSnippet(BaseModel):
    name: str
    language: str
    code: str
    description: Optional[str] = None


@router.get("/files")
async def list_code_files(
    folder_id: Optional[int] = None,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user)
):
    """List all code files in the user's workspace"""
    query = select(File).where(File.user_id == current_user.id)

    if folder_id:
        query = query.where(File.folder_id == folder_id)

    result = await db.execute(query)
    files = result.scalars().all()

    return {
        "files": [
            {
                "id": f.id,
                "name": f.name,
                "path": f.path,
                "size": f.size,
                "mime_type": f.file_type or None,
                "folder_id": f.folder_id,
                "created_at": f.created_at.isoformat(),
                "updated_at": f.updated_at.isoformat(),
                "language": detect_language(f.name)
            }
            for f in files
        ],
        "total": len(files)
    }


@router.get("/files/{file_id}/content")
async def get_file_content(
    file_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user)
):
    """Get file content for editing"""
    result = await db.execute(
        select(File).where(File.id == file_id, File.user_id == current_user.id)
    )
    file = result.scalar_one_or_none()

    if not file:
        raise HTTPException(status_code=404, detail="File not found")

    # In a real implementation, fetch content from S3 or file system
    # For now, return metadata
    return {
        "id": file.id,
        "name": file.name,
        "path": file.path,
        "language": detect_language(file.name),
        "content": "// File content would be loaded here\n// from S3 or file system",
        "metadata": {
            "size": file.size,
            "mime_type": file.file_type or None,
            "created_at": file.created_at.isoformat(),
            "updated_at": file.updated_at.isoformat()
        }
    }


@router.put("/files/{file_id}/content")
async def update_file_content(
    file_id: int,
    content: str,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user)
):
    """Update file content"""
    result = await db.execute(
        select(File).where(File.id == file_id, File.user_id == current_user.id)
    )
    file = result.scalar_one_or_none()

    if not file:
        raise HTTPException(status_code=404, detail="File not found")

    # In a real implementation, save to S3 or file system
    file.updated_at = datetime.utcnow()
    file.size = len(content.encode('utf-8'))

    await db.commit()

    return {
        "message": "File updated successfully",
        "file_id": file.id,
        "size": file.size
    }


@router.get("/tree")
async def get_file_tree(
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user)
):
    """Get hierarchical file tree for the sidebar"""
    # Get all folders
    folders_result = await db.execute(
        select(Folder).where(Folder.user_id == current_user.id)
    )
    folders = folders_result.scalars().all()

    # Get all files
    files_result = await db.execute(
        select(File).where(File.user_id == current_user.id)
    )
    files = files_result.scalars().all()

    # Build tree structure
    def build_tree():
        tree = []
        folder_map = {}

        # Create folder nodes
        for folder in folders:
            folder_node = {
                "id": f"folder-{folder.id}",
                "name": folder.name,
                "type": "folder",
                "path": folder.path,
                "children": []
            }
            folder_map[folder.id] = folder_node

            if folder.parent_id is None:
                tree.append(folder_node)
            else:
                parent = folder_map.get(folder.parent_id)
                if parent:
                    parent["children"].append(folder_node)

        # Add files to folders
        for file in files:
            file_node = {
                "id": f"file-{file.id}",
                "name": file.name,
                "type": "file",
                "path": file.path,
                "language": detect_language(file.name),
                "size": file.size
            }

            if file.folder_id:
                folder = folder_map.get(file.folder_id)
                if folder:
                    folder["children"].append(file_node)
            else:
                tree.append(file_node)

        return tree

    return {"tree": build_tree()}


@router.get("/languages")
async def list_supported_languages(
    current_user: User = Depends(get_current_user)
):
    """List all supported programming languages"""
    languages = [
        {"id": "javascript", "name": "JavaScript", "extensions": [".js", ".jsx"]},
        {"id": "typescript", "name": "TypeScript", "extensions": [".ts", ".tsx"]},
        {"id": "python", "name": "Python", "extensions": [".py"]},
        {"id": "java", "name": "Java", "extensions": [".java"]},
        {"id": "csharp", "name": "C#", "extensions": [".cs"]},
        {"id": "cpp", "name": "C++", "extensions": [".cpp", ".hpp", ".h"]},
        {"id": "c", "name": "C", "extensions": [".c", ".h"]},
        {"id": "go", "name": "Go", "extensions": [".go"]},
        {"id": "rust", "name": "Rust", "extensions": [".rs"]},
        {"id": "ruby", "name": "Ruby", "extensions": [".rb"]},
        {"id": "php", "name": "PHP", "extensions": [".php"]},
        {"id": "html", "name": "HTML", "extensions": [".html", ".htm"]},
        {"id": "css", "name": "CSS", "extensions": [".css"]},
        {"id": "scss", "name": "SCSS", "extensions": [".scss"]},
        {"id": "json", "name": "JSON", "extensions": [".json"]},
        {"id": "yaml", "name": "YAML", "extensions": [".yaml", ".yml"]},
        {"id": "markdown", "name": "Markdown", "extensions": [".md"]},
        {"id": "sql", "name": "SQL", "extensions": [".sql"]},
        {"id": "shell", "name": "Shell", "extensions": [".sh", ".bash"]},
        {"id": "dockerfile", "name": "Dockerfile", "extensions": ["Dockerfile"]},
    ]

    return {"languages": languages}


@router.get("/snippets")
async def list_snippets(
    language: Optional[str] = None,
    current_user: User = Depends(get_current_user)
):
    """Get code snippets"""
    # Default snippets for various languages
    snippets = {
        "python": [
            {
                "name": "Function",
                "prefix": "def",
                "code": "def ${1:function_name}(${2:params}):\n    ${3:pass}"
            },
            {
                "name": "Class",
                "prefix": "class",
                "code": "class ${1:ClassName}:\n    def __init__(self, ${2:params}):\n        ${3:pass}"
            },
            {
                "name": "For Loop",
                "prefix": "for",
                "code": "for ${1:item} in ${2:iterable}:\n    ${3:pass}"
            }
        ],
        "javascript": [
            {
                "name": "Function",
                "prefix": "func",
                "code": "function ${1:functionName}(${2:params}) {\n    ${3:// code}\n}"
            },
            {
                "name": "Arrow Function",
                "prefix": "arrow",
                "code": "const ${1:functionName} = (${2:params}) => {\n    ${3:// code}\n}"
            },
            {
                "name": "Class",
                "prefix": "class",
                "code": "class ${1:ClassName} {\n    constructor(${2:params}) {\n        ${3:// code}\n    }\n}"
            }
        ],
        "go": [
            {
                "name": "Function",
                "prefix": "func",
                "code": "func ${1:functionName}(${2:params}) ${3:returnType} {\n    ${4:// code}\n}"
            },
            {
                "name": "Struct",
                "prefix": "struct",
                "code": "type ${1:StructName} struct {\n    ${2:// fields}\n}"
            }
        ]
    }

    if language:
        return {"snippets": snippets.get(language, [])}

    return {"snippets": snippets}


@router.get("/themes")
async def list_themes(
    current_user: User = Depends(get_current_user)
):
    """List available editor themes"""
    themes = [
        {"id": "vs", "name": "Visual Studio Light"},
        {"id": "vs-dark", "name": "Visual Studio Dark"},
        {"id": "hc-black", "name": "High Contrast Dark"},
        {"id": "monokai", "name": "Monokai"},
        {"id": "github", "name": "GitHub"},
        {"id": "solarized-dark", "name": "Solarized Dark"},
        {"id": "solarized-light", "name": "Solarized Light"},
    ]

    return {"themes": themes}


def detect_language(filename: str) -> str:
    """Detect programming language from file extension"""
    extension_map = {
        ".js": "javascript",
        ".jsx": "javascript",
        ".ts": "typescript",
        ".tsx": "typescript",
        ".py": "python",
        ".java": "java",
        ".cs": "csharp",
        ".cpp": "cpp",
        ".hpp": "cpp",
        ".c": "c",
        ".h": "c",
        ".go": "go",
        ".rs": "rust",
        ".rb": "ruby",
        ".php": "php",
        ".html": "html",
        ".htm": "html",
        ".css": "css",
        ".scss": "scss",
        ".json": "json",
        ".yaml": "yaml",
        ".yml": "yaml",
        ".md": "markdown",
        ".sql": "sql",
        ".sh": "shell",
        ".bash": "shell"
    }

    ext = "." + filename.split(".")[-1] if "." in filename else ""
    return extension_map.get(ext.lower(), "plaintext")