"""Filesystem tools: read_file, list_dir, write_file, make_dir, delete_file."""

from pathlib import Path
from typing import Any

from pydantic import BaseModel, Field

from app.models.tool_call import ToolResult, ToolResultStatus
from app.tools.base import BaseTool
from app.utils.file_helpers import (
    BinaryFileError,
    FileSizeError,
    PathSecurityError,
    resolve_safe_path,
    safe_read_file,
    safe_write_file,
)


class ReadFileParams(BaseModel):
    """Parameters for the read_file tool."""

    file_path: str = Field(description="Path to the file to read (relative to workspace root)")


class ReadFileTool(BaseTool):
    """Read the contents of a file within the workspace."""

    name = "read_file"
    description = "Read the full contents of a text file. Returns the file content as a string."
    params_model = ReadFileParams

    def execute(self, *, tool_call_id: str, file_path: str, **kwargs: Any) -> ToolResult:
        fs_config = self.config.tools.filesystem
        try:
            content = safe_read_file(
                file_path,
                self.workspace_root,
                max_size_bytes=fs_config.max_file_size_bytes,
                check_binary=fs_config.binary_detection,
            )
        except PathSecurityError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )
        except FileNotFoundError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )
        except FileSizeError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )
        except BinaryFileError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )

        return ToolResult(
            tool_call_id=tool_call_id,
            tool_name=self.name,
            status=ToolResultStatus.SUCCESS,
            output=content,
        )


class ListDirParams(BaseModel):
    """Parameters for the list_dir tool."""

    directory_path: str = Field(
        default=".", description="Path to the directory to list (relative to workspace root)"
    )
    recursive: bool = Field(default=False, description="If true, list entries recursively")


_MAX_ENTRIES = 500


class ListDirTool(BaseTool):
    """List files and directories within the workspace."""

    name = "list_dir"
    description = (
        "List the contents of a directory. Directories are suffixed with '/'. "
        "Results are sorted with directories first, then files."
    )
    params_model = ListDirParams

    def execute(
        self, *, tool_call_id: str, directory_path: str = ".", recursive: bool = False, **kwargs: Any
    ) -> ToolResult:
        try:
            safe_path = resolve_safe_path(directory_path, self.workspace_root)
        except PathSecurityError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )

        if not safe_path.is_dir():
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=f"Not a directory: {safe_path}",
            )

        entries: list[Path] = []
        if recursive:
            entries = list(safe_path.rglob("*"))
        else:
            entries = list(safe_path.iterdir())

        # Sort: directories first, then files, alphabetical within each group
        dirs = sorted([e for e in entries if e.is_dir()])
        files = sorted([e for e in entries if e.is_file()])
        sorted_entries = dirs + files

        lines: list[str] = []
        for entry in sorted_entries[:_MAX_ENTRIES]:
            try:
                rel = entry.relative_to(self.workspace_root)
            except ValueError:
                rel = entry
            suffix = "/" if entry.is_dir() else ""
            lines.append(f"{rel}{suffix}")

        if len(sorted_entries) > _MAX_ENTRIES:
            lines.append(f"\n... truncated ({len(sorted_entries)} total entries, showing {_MAX_ENTRIES})")

        return ToolResult(
            tool_call_id=tool_call_id,
            tool_name=self.name,
            status=ToolResultStatus.SUCCESS,
            output="\n".join(lines),
        )


class WriteFileParams(BaseModel):
    """Parameters for the write_file tool."""

    file_path: str = Field(description="Path to the file to write (relative to workspace root)")
    content: str = Field(description="Content to write to the file")


class WriteFileTool(BaseTool):
    """Write content to a file within the workspace."""

    name = "write_file"
    description = (
        "Write text content to a file. Creates parent directories if needed. "
        "Overwrites existing file content."
    )
    params_model = WriteFileParams

    def execute(self, *, tool_call_id: str, file_path: str, content: str, **kwargs: Any) -> ToolResult:
        fs_config = self.config.tools.filesystem
        try:
            safe_path = safe_write_file(
                file_path,
                content,
                self.workspace_root,
                max_size_bytes=fs_config.max_file_size_bytes,
            )
        except PathSecurityError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )
        except FileSizeError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )

        try:
            rel_path = safe_path.relative_to(self.workspace_root)
        except ValueError:
            rel_path = safe_path

        return ToolResult(
            tool_call_id=tool_call_id,
            tool_name=self.name,
            status=ToolResultStatus.SUCCESS,
            output=f"Wrote {len(content)} characters to {rel_path}",
        )


class MakeDirParams(BaseModel):
    """Parameters for the make_dir tool."""

    directory_path: str = Field(description="Path to the directory to create (relative to workspace root)")


class MakeDirTool(BaseTool):
    """Create a directory (and any missing parents) within the workspace."""

    name = "make_dir"
    description = "Create a directory and any necessary parent directories."
    params_model = MakeDirParams

    def execute(self, *, tool_call_id: str, directory_path: str, **kwargs: Any) -> ToolResult:
        try:
            safe_path = resolve_safe_path(directory_path, self.workspace_root)
        except PathSecurityError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )

        if safe_path.exists() and not safe_path.is_dir():
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=f"Path exists and is not a directory: {safe_path}",
            )

        try:
            safe_path.mkdir(parents=True, exist_ok=True)
        except OSError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=f"Failed to create directory: {exc}",
            )

        try:
            rel_path = safe_path.relative_to(self.workspace_root)
        except ValueError:
            rel_path = safe_path

        return ToolResult(
            tool_call_id=tool_call_id,
            tool_name=self.name,
            status=ToolResultStatus.SUCCESS,
            output=f"Created directory: {rel_path}",
        )


class DeleteFileParams(BaseModel):
    """Parameters for the delete_file tool."""

    file_path: str = Field(description="Path to the file to delete (relative to workspace root)")


class DeleteFileTool(BaseTool):
    """Delete a file within the workspace. Refuses to delete directories."""

    name = "delete_file"
    description = "Delete a single file. Does not delete directories."
    params_model = DeleteFileParams

    def execute(self, *, tool_call_id: str, file_path: str, **kwargs: Any) -> ToolResult:
        try:
            safe_path = resolve_safe_path(file_path, self.workspace_root)
        except PathSecurityError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=str(exc),
            )

        if safe_path.is_dir():
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=f"Path is a directory, not a file: {safe_path}",
            )

        if not safe_path.exists():
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=f"File not found: {safe_path}",
            )

        try:
            safe_path.unlink()
        except OSError as exc:
            return ToolResult(
                tool_call_id=tool_call_id,
                tool_name=self.name,
                status=ToolResultStatus.ERROR,
                error=f"Failed to delete file: {exc}",
            )

        try:
            rel_path = safe_path.relative_to(self.workspace_root)
        except ValueError:
            rel_path = safe_path

        return ToolResult(
            tool_call_id=tool_call_id,
            tool_name=self.name,
            status=ToolResultStatus.SUCCESS,
            output=f"Deleted: {rel_path}",
        )