#!/usr/bin/env python3

# Copyright (c) Advanced Micro Devices, Inc., or its affiliates.
# SPDX-License-Identifier: MIT

"""
Shared Python dispatcher utilities for GEMM and grouped convolution.

Extracted from ctypes_utils.py (GEMM) + compile_grouped_conv_examples.py (grouped conv).
Both ctypes_utils.py and grouped_conv_utils.py import from here to
eliminate duplication.

Best-of-both:
  - Validation and auto-correction return typed objects (GEMM pattern)
  - Colors class with cross-platform ANSI handling (conv pattern)
  - Phased output helpers (conv pattern)
  - logging module instead of bare print() (shared improvement)
"""

import logging
import shutil
import sys
from dataclasses import dataclass, field
from pathlib import Path
from typing import Any, Dict, List, Optional, Tuple

log = logging.getLogger(__name__)


# ============================================================================
# Path Configuration
# ============================================================================


def get_dispatcher_root() -> Path:
    """Get the dispatcher root directory (parent of python/)."""
    return Path(__file__).parent.parent


def get_ck_root() -> Path:
    """Get the CK root directory (parent of dispatcher/)."""
    return get_dispatcher_root().parent


def get_build_dir() -> Path:
    """Get the build directory."""
    return get_dispatcher_root() / "build"


def get_generated_kernels_dir() -> Path:
    """Get the generated kernels directory."""
    return get_build_dir() / "generated_kernels"


def get_codegen_dir() -> Path:
    """Get the codegen scripts directory."""
    return get_dispatcher_root() / "codegen"


# ============================================================================
# Architecture Filter Data
# ============================================================================

_arch_data_cache: Optional[Dict[str, Any]] = None


def detect_gpu_arch(fallback: str = "gfx942") -> str:
    """Detect the GPU architecture from rocminfo. Falls back to the given default."""
    import subprocess

    try:
        out = subprocess.check_output(
            ["rocminfo"], text=True, stderr=subprocess.DEVNULL
        )
        for line in out.splitlines():
            if "Name:" in line and "gfx" in line:
                return line.split()[-1].strip()
    except Exception:
        pass
    return fallback


def get_arch_filter_data() -> Dict[str, Any]:
    """Load arch filter data from arch_specs_generated if available.

    Returns dict with keys: trait_unsupported, warp_combos,
    warp_tile_combos, supported_archs.
    """
    global _arch_data_cache
    if _arch_data_cache is not None:
        return _arch_data_cache

    codegen_dir = get_dispatcher_root() / "codegen"
    sys.path.insert(0, str(codegen_dir))

    try:
        from arch_specs_generated import (
            TRAIT_UNSUPPORTED_COMBINATIONS,
            WARP_SUPPORTED_COMBINATIONS,
            WARP_TILE_SUPPORTED_COMBINATIONS,
            get_supported_archs,
        )

        _arch_data_cache = {
            "trait_unsupported": TRAIT_UNSUPPORTED_COMBINATIONS,
            "warp_combos": WARP_SUPPORTED_COMBINATIONS,
            "warp_tile_combos": WARP_TILE_SUPPORTED_COMBINATIONS,
            "supported_archs": get_supported_archs(),
        }
    except ImportError:
        _arch_data_cache = {
            "trait_unsupported": {
                ("compv3", "cshuffle", "interwave"),
                ("compv3", "default", "interwave"),
                ("compv4", "cshuffle", "interwave"),
                ("compv4", "default", "interwave"),
            },
            "warp_combos": {
                "gfx942": [[1, 4, 1], [2, 2, 1], [4, 1, 1]],
                "gfx90a": [[1, 4, 1], [2, 2, 1], [4, 1, 1]],
            },
            "warp_tile_combos": {
                "gfx942": {"fp16_fp16_fp32": [[16, 16, 16], [32, 32, 16]]},
                "gfx90a": {"fp16_fp16_fp32": [[16, 16, 16], [32, 32, 16]]},
            },
            "supported_archs": ["gfx90a", "gfx942", "gfx950"],
        }

    return _arch_data_cache


# ============================================================================
# Validation Result
# ============================================================================


@dataclass
class ValidationResultBase:
    """Result of kernel config validation (shared base for GEMM and conv)."""

    is_valid: bool
    errors: List[str] = field(default_factory=list)
    warnings: List[str] = field(default_factory=list)
    suggested_fixes: Dict[str, Any] = field(default_factory=dict)

    def print_result(self, indent: str = "  "):
        if self.is_valid:
            print(f"{indent}OK Configuration valid")
        else:
            print(f"{indent}WARNING Configuration has issues:")
            for err in self.errors:
                print(f"{indent}  - {err}")
        if self.warnings:
            for warn in self.warnings:
                print(f"{indent}  Warning: {warn}")
        if self.suggested_fixes:
            print(f"{indent}  Suggested fixes:")
            for key, val in self.suggested_fixes.items():
                print(f"{indent}    {key}: {val}")


# ============================================================================
# Validation Helpers
# ============================================================================


def validate_wave_config(wave_cfg: List[int], arch: str) -> Tuple[bool, str]:
    """Validate a [wave_m, wave_n, wave_k] config for *arch*.

    Returns (is_valid, error_message). Empty string on success.
    """
    data = get_arch_filter_data()
    valid_waves = data["warp_combos"].get(arch, [[2, 2, 1]])
    if wave_cfg in valid_waves:
        return True, ""
    valid_str = ", ".join(f"[{c[0]},{c[1]},{c[2]}]" for c in valid_waves)
    return (
        False,
        f"Unsupported wave configuration {wave_cfg} for {arch}. "
        f"Valid wave configs: {valid_str}",
    )


def validate_warp_tile_config(
    warp_cfg: List[int], arch: str, dtype: str
) -> Tuple[bool, str]:
    """Validate a [warp_m, warp_n, warp_k] config for *arch*/*dtype*.

    Returns (is_valid, error_message). Empty string on success.
    """
    data = get_arch_filter_data()
    acc = "int32" if dtype == "int8" else "fp32"
    dtype_key = f"{dtype}_{dtype}_{acc}"
    valid_tiles = (
        data["warp_tile_combos"]
        .get(arch, {})
        .get(dtype_key, [[32, 32, 16], [16, 16, 16]])
    )
    if warp_cfg in valid_tiles:
        return True, ""
    valid_str = ", ".join(f"[{c[0]},{c[1]},{c[2]}]" for c in valid_tiles[:5])
    return (
        False,
        f"Unsupported warp tile {warp_cfg} for {arch}/{dtype}. "
        f"Valid warp tiles: {valid_str}",
    )


def validate_trait_combo(
    pipeline: str, epilogue: str, scheduler: str
) -> Tuple[bool, str]:
    """Validate a (pipeline, epilogue, scheduler) combination.

    Returns (is_valid, error_message). Empty string on success.
    """
    data = get_arch_filter_data()
    combo = (pipeline, epilogue, scheduler)
    if combo in data["trait_unsupported"]:
        return (
            False,
            f"Unsupported trait combination: pipeline={pipeline}, "
            f"epilogue={epilogue}, scheduler={scheduler}",
        )
    return True, ""


# ============================================================================
# Auto-Correction Helpers
# ============================================================================


def auto_correct_wave(wave_cfg: List[int], arch: str) -> List[int]:
    """Return the first valid wave config for *arch*.

    If *wave_cfg* is already valid, returns it unchanged.
    """
    data = get_arch_filter_data()
    valid_waves = data["warp_combos"].get(arch, [[2, 2, 1]])
    if wave_cfg in valid_waves:
        return wave_cfg
    return valid_waves[0] if valid_waves else [2, 2, 1]


def auto_correct_trait(pipeline: str, scheduler: str) -> Tuple[str, str]:
    """Return a corrected (pipeline, scheduler) pair.

    If the compute pipeline doesn't support interwave, switch to intrawave.
    """
    data = get_arch_filter_data()
    for epilogue in ("cshuffle", "default"):
        if (pipeline, epilogue, scheduler) in data["trait_unsupported"]:
            return pipeline, "intrawave"
    return pipeline, scheduler


# ============================================================================
# Colors (adopted from compile_grouped_conv_examples.py -- cross-platform)
# ============================================================================


class Colors:
    """Cross-platform ANSI color support.

    Respects sys.platform (no ANSI on Windows) and isatty() check so
    piped/redirected output stays clean.
    """

    _GREEN = "\033[0;32m"
    _YELLOW = "\033[1;33m"
    _RED = "\033[0;31m"
    _CYAN = "\033[0;36m"
    _BOLD = "\033[1m"
    _NC = "\033[0m"

    @classmethod
    def _use_color(cls) -> bool:
        return (
            sys.platform != "win32"
            and hasattr(sys.stdout, "isatty")
            and sys.stdout.isatty()
        )

    @classmethod
    def green(cls, text: str) -> str:
        if cls._use_color():
            return f"{cls._GREEN}{text}{cls._NC}"
        return text

    @classmethod
    def red(cls, text: str) -> str:
        if cls._use_color():
            return f"{cls._RED}{text}{cls._NC}"
        return text

    @classmethod
    def yellow(cls, text: str) -> str:
        if cls._use_color():
            return f"{cls._YELLOW}{text}{cls._NC}"
        return text

    @classmethod
    def cyan(cls, text: str) -> str:
        if cls._use_color():
            return f"{cls._CYAN}{text}{cls._NC}"
        return text

    @classmethod
    def bold(cls, text: str) -> str:
        if cls._use_color():
            return f"{cls._BOLD}{text}{cls._NC}"
        return text


# ============================================================================
# Phased Output Helpers
# ============================================================================


def print_phase(number: int, description: str) -> None:
    """Print a phase header (e.g. 'Phase 1: Codegen')."""
    print(f"\n{'=' * 60}")
    print(f"  Phase {number}: {description}")
    print(f"{'=' * 60}")


def print_success(message: str) -> None:
    """Print a success message."""
    print(f"  OK {Colors.green(message)}")


def print_error(message: str) -> None:
    """Print an error message."""
    print(f"  FAIL {Colors.red(message)}")


def print_info(message: str) -> None:
    """Print an info message."""
    print(f"  {Colors.cyan(message)}")


# ============================================================================
# Cleanup Helpers
# ============================================================================


def cleanup_generated_kernels(gen_dir: Optional[Path] = None) -> None:
    """Remove generated kernel directory if it exists."""
    if gen_dir is None:
        gen_dir = get_generated_kernels_dir()
    if gen_dir.exists():
        shutil.rmtree(gen_dir, ignore_errors=True)
        log.info("Cleaned up generated kernels at %s", gen_dir)


# ============================================================================
# Tool Helpers
# ============================================================================


def find_hipcc() -> Optional[str]:
    """Find the hipcc compiler."""
    import os

    candidates = [
        os.environ.get("HIPCC"),
        "/opt/rocm/bin/hipcc",
        shutil.which("hipcc"),
    ]
    for path in candidates:
        if path and os.path.isfile(path):
            return path
    return None