# -*- coding: utf-8 -*-
"""MetaX/MuXi MACA accelerator adapter."""

from __future__ import annotations

import json
import re
from typing import Any

from .base import (
    AcceleratorInfo,
    command_exists,
    first_env_devices,
    parse_memory_gb,
    run_command,
)


class MetaxAcceleratorAdapter:
    vendor = "metax"
    runtime = "maca"
    smi_command = "mx-smi"
    visible_env_names = (
        "METAX_VISIBLE_DEVICES",
        "MACA_VISIBLE_DEVICES",
        "MX_VISIBLE_DEVICES",
    )

    def _json_output(self, command: list[str]) -> Any:
        output = run_command(command)
        if not output:
            return None
        try:
            return json.loads(output)
        except json.JSONDecodeError:
            return None

    def _walk_json(self, value: Any):
        if isinstance(value, dict):
            yield value
            for child in value.values():
                yield from self._walk_json(child)
        elif isinstance(value, list):
            for item in value:
                yield from self._walk_json(item)

    def _count_from_json(self, value: Any) -> int:
        max_index = -1
        device_like = 0
        for item in self._walk_json(value):
            keys = {str(key).lower(): key for key in item.keys()}
            if any(key in keys for key in ("gpu id", "gpu_id", "gpu", "device id", "device_id", "index")):
                device_like += 1
            for key_name in ("gpu id", "gpu_id", "device id", "device_id", "index", "id"):
                original = keys.get(key_name)
                if original is None:
                    continue
                try:
                    max_index = max(max_index, int(item[original]))
                except (TypeError, ValueError):
                    continue
        if max_index >= 0:
            return max_index + 1
        return device_like

    def _memory_from_json(self, value: Any) -> float:
        memory_values: list[float] = []
        for item in self._walk_json(value):
            for raw_key, raw_value in item.items():
                key = str(raw_key).lower()
                if not any(token in key for token in ("memory", "mem", "hbm", "vram", "容量")):
                    continue
                if isinstance(raw_value, (int, float)):
                    numeric = float(raw_value)
                    # mx-smi reports are commonly MiB for memory counters.
                    if numeric > 1024:
                        numeric = numeric / 1024
                    memory_values.append(numeric)
                    continue
                if isinstance(raw_value, str):
                    parsed = parse_memory_gb(raw_value)
                    if parsed > 0:
                        memory_values.append(parsed)
        return min(memory_values) if memory_values else 0.0

    def _query_device_count(self) -> tuple[int, str]:
        json_info = self._json_output([self.smi_command, "-j"])
        json_count = self._count_from_json(json_info)
        if json_count > 0:
            return json_count, json.dumps(json_info, ensure_ascii=False)

        list_output = run_command([self.smi_command, "-L"])
        if list_output:
            lines = [line for line in list_output.splitlines() if line.strip()]
            gpu_lines = [
                line
                for line in lines
                if re.search(r"\b(gpu|device|card)\b", line, re.I)
            ]
            return len(gpu_lines or lines), list_output

        table_output = run_command([self.smi_command])
        if table_output:
            indexes = set(re.findall(r"(?:GPU|Device|Card)\s*[:#]?\s*([0-9]+)", table_output, re.I))
            if not indexes:
                indexes = set(re.findall(r"^\s*\|\s*([0-9]+)\s+", table_output, re.M))
            return len(indexes), table_output

        return 0, ""

    def _query_memory_gb(self, fallback_output: str) -> float:
        for command in (
            [self.smi_command, "--show-memory", "-j"],
            [self.smi_command, "--show-hwinfo", "-j"],
            [self.smi_command, "-j"],
        ):
            parsed = self._memory_from_json(self._json_output(command))
            if parsed > 0:
                return parsed

        memory_output = run_command([self.smi_command, "--show-memory"])
        hwinfo_output = run_command([self.smi_command, "--show-hwinfo"])
        return (
            parse_memory_gb(memory_output)
            or parse_memory_gb(hwinfo_output)
            or parse_memory_gb(fallback_output)
        )

    def detect(self) -> AcceleratorInfo:
        visible_devices = first_env_devices(self.visible_env_names)
        smi_available = command_exists(self.smi_command)
        if not smi_available:
            return AcceleratorInfo(
                vendor=self.vendor,
                runtime=self.runtime,
                device="cpu",
                visible_devices=visible_devices,
                smi_command=None,
                available=False,
                reason="mx-smi not found",
            )

        device_count, raw_output = self._query_device_count()
        if visible_devices:
            device_count = min(device_count or len(visible_devices), len(visible_devices))
        total_memory_gb = self._query_memory_gb(raw_output)

        torch_cuda_available = False
        torch_version = ""
        try:
            import torch

            torch_version = getattr(torch, "__version__", "")
            torch_cuda_available = bool(torch.cuda.is_available())
        except Exception:
            pass

        available = device_count > 0
        return AcceleratorInfo(
            vendor=self.vendor,
            runtime=self.runtime,
            device="cuda:0" if available else "cpu",
            device_count=device_count,
            visible_devices=visible_devices,
            total_memory_gb=total_memory_gb,
            smi_command=self.smi_command,
            available=available,
            reason="" if available else "mx-smi did not report any device",
            metadata={
                "torch_cuda_available": torch_cuda_available,
                "torch_version": torch_version,
                "supports_sharded": available,
            },
        )