from __future__ import annotations

import re
from dataclasses import dataclass
from pathlib import Path

from adam.config import ConfigManager


@dataclass(frozen=True, slots=True)
class ToolFolderDefinition:
    tool_id: str
    name: str
    expected_files: tuple[str, ...] = ()


@dataclass(frozen=True, slots=True)
class ToolFolderStatus:
    tool_id: str
    name: str
    path: str
    exists: bool
    valid: bool
    entry_points: tuple[str, ...]
    message: str


TOOL_FOLDER_DEFINITIONS = (
    ToolFolderDefinition(
        "dataset_collector",
        "Dataset Collector",
        ("collector.py", "dataset_collector.py", "main.py"),
    ),
    ToolFolderDefinition(
        "caption_generator",
        "Caption Generator",
        ("caption.py", "caption_generator.py", "main.py"),
    ),
    ToolFolderDefinition(
        "lora_trainer",
        "LoRA Trainer",
        ("train.py", "lora_train.py", "main.py", "src/loratrainer/main.py"),
    ),
    ToolFolderDefinition(
        "ddpm_trainer",
        "DDPM Trainer",
        ("train.py", "appStableDiffusion.py"),
    ),
    ToolFolderDefinition(
        "flow_trainer",
        "Flow Matching Trainer",
        ("flow_matching_app.py", "roblox_action_flow_app.py"),
    ),
    ToolFolderDefinition(
        "preview_generator",
        "Preview Generator",
        ("generate.py", "preview.py", "main.py"),
    ),
)


class ToolFolderManager:
    def __init__(self, config: ConfigManager) -> None:
        self.config = config
        self.definitions = {
            definition.tool_id: definition
            for definition in TOOL_FOLDER_DEFINITIONS
        }

    def paths(self) -> dict[str, str]:
        stored = self.config.get("tool_folders", {})
        return dict(stored) if isinstance(stored, dict) else {}

    def get(self, tool_id: str) -> str:
        return str(self.paths().get(tool_id, ""))

    def set(self, tool_id: str, path: str) -> ToolFolderStatus:
        if tool_id not in self.definitions:
            raise KeyError(f"Unknown tool folder: {tool_id}")
        stored = self.paths()
        stored[tool_id] = path.strip().strip('"')
        self.config.update({"tool_folders": stored})
        return self.scan(tool_id)

    def update(self, values: dict[str, str]) -> dict[str, ToolFolderStatus]:
        stored = self.paths()
        for tool_id, value in values.items():
            if tool_id in self.definitions:
                stored[tool_id] = value.strip().strip('"')
        self.config.update({"tool_folders": stored})
        return {tool_id: self.scan(tool_id) for tool_id in values}

    def scan(self, tool_id: str) -> ToolFolderStatus:
        definition = self.definitions[tool_id]
        raw_path = self.get(tool_id)
        if not raw_path:
            return ToolFolderStatus(
                tool_id,
                definition.name,
                "",
                False,
                False,
                (),
                "Not configured",
            )
        folder = Path(raw_path).expanduser()
        if not folder.is_dir():
            return ToolFolderStatus(
                tool_id,
                definition.name,
                str(folder),
                False,
                False,
                (),
                "Folder not found",
            )
        entry_points = tuple(
            filename
            for filename in definition.expected_files
            if (folder / filename).is_file()
        )
        if entry_points:
            message = f"Detected · {', '.join(entry_points)}"
            valid = True
        else:
            top_level_python = sorted(path.name for path in folder.glob("*.py"))
            entry_points = tuple(top_level_python[:5])
            valid = bool(entry_points)
            message = (
                f"Python project detected · review {entry_points[0]}"
                if entry_points
                else "Folder found · no Python entry point detected"
            )
        return ToolFolderStatus(
            tool_id,
            definition.name,
            str(folder.resolve()),
            True,
            valid,
            entry_points,
            message,
        )

    def scan_all(self) -> dict[str, ToolFolderStatus]:
        return {
            tool_id: self.scan(tool_id)
            for tool_id in self.definitions
        }

    def parse_assignments(self, text: str) -> dict[str, str]:
        """Recognize folder assignments pasted into chat without executing them."""
        patterns = {
            "ddpm_trainer": r"(?im)^\s*DDPM(?:\s+Trainer)?\s*:\s*(.+?)\s*$",
            "flow_trainer": (
                r"(?im)^\s*Flow(?:\s+Matching)?(?:\s+Trainer)?\s*:\s*(.+?)\s*$"
            ),
            "lora_trainer": r"(?im)^\s*LoRA(?:\s+Trainer)?\s*:\s*(.+?)\s*$",
            "dataset_collector": (
                r"(?im)^\s*Dataset(?:\s+Collector)?\s*:\s*(.+?)\s*$"
            ),
            "caption_generator": (
                r"(?im)^\s*Caption(?:\s+Generator)?\s*:\s*(.+?)\s*$"
            ),
            "preview_generator": (
                r"(?im)^\s*Preview(?:\s+Generator)?\s*:\s*(.+?)\s*$"
            ),
        }
        assignments: dict[str, str] = {}
        for tool_id, pattern in patterns.items():
            match = re.search(pattern, text)
            if match:
                assignments[tool_id] = match.group(1).strip().strip('"')
        return assignments