from __future__ import annotations

import os
import ast
import traceback
from typing import Any

from lib.Projectrans.Utils import compute_sha1, get_file_dependencies, find_reachable_files_from_entries
from lib.Projectrans.DeclarationGenerator import DeclarationGenerator
from lib.core.VLogger import get_logger as _vlog
from lib.constants.config import mode as _ConfigMode
from StubGen import PythonToStubConverter


class Phase1Generator:
    """阶段一：从源文件生成声明接口"""

    def __init__(self, src_root: str, temp_dir: str, include_dirs: list[str] | None = None, entry_files: list[str] | None = None, target_triple: str | None = None, target_datalayout: str | None = None) -> None:
        self.src_root: str = os.path.abspath(src_root)
        self.temp_dir: str = os.path.abspath(temp_dir)
        self.include_dirs: list[str] = include_dirs or []
        self.sha1_map: dict[str, str] = {}
        self.include_py_map: dict[str, str] = {}
        self.entry_files: list[str] | None = entry_files
        self.target_triple: str | None = target_triple
        self.target_datalayout: str | None = target_datalayout
        os.makedirs(self.temp_dir, exist_ok=True)

    def _get_needed_include_files(self, reachable_source_files: set[str]) -> list[tuple[str, str, str]]:
        """从可达源文件收集所有被引用（含传递依赖）的 include 文件"""
        include_file_map: dict[str, tuple[str, str, str]] = {}
        for includes_dir in self.include_dirs:
            if not os.path.isdir(includes_dir):
                continue
            for root, dirs, files in os.walk(includes_dir):
                dirs[:] = [d for d in dirs if not d.startswith('.') and d != '__pycache__']
                for fname in files:
                    if fname.endswith('.py') or fname.endswith('.pyi'):
                        src_path: str = os.path.join(root, fname)
                        rel_from_inc: str = os.path.relpath(src_path, includes_dir)
                        ModulePath: str = rel_from_inc.replace(os.sep, '.').replace('/', '.')
                        module_name: str = os.path.splitext(ModulePath)[0]
                        info: tuple[str, str, str] = (src_path, rel_from_inc, includes_dir)
                        include_file_map[module_name] = info
                        top_pkg: str = module_name.split('.')[0]
                        if top_pkg not in include_file_map:
                            include_file_map[top_pkg] = info

        imported_from_src: set[str] = set()
        for src_path in reachable_source_files:
            deps: set[str] = get_file_dependencies(src_path, self.src_root)
            imported_from_src.update(deps)

        # 检测 dict/list 容器使用，自动添加 _dict/_list/json 依赖
        for src_path in reachable_source_files:
            try:
                with open(src_path, 'r', encoding='utf-8') as f:
                    content: str = f.read()
                tree = ast.parse(content)
                for node in ast.walk(tree):
                    if isinstance(node, ast.Subscript) and isinstance(node.value, ast.Name):
                        if node.value.id == 'dict':
                            imported_from_src.add('_dict')
                            imported_from_src.add('json')
                            break
                        elif node.value.id == 'list':
                            imported_from_src.add('_list')
                            break
                    if isinstance(node, ast.Call) and isinstance(node.func, ast.Name):
                        if node.func.id == 'dict':
                            imported_from_src.add('_dict')
                            imported_from_src.add('json')
                            break
                        elif node.func.id == 'list':
                            imported_from_src.add('_list')
                            break
                    # 检测类型注解 d: dict / l: list (非泛型形式)
                    if isinstance(node, ast.AnnAssign) and isinstance(node.annotation, ast.Name):
                        if node.annotation.id == 'dict':
                            imported_from_src.add('_dict')
                            imported_from_src.add('json')
                            break
                        elif node.annotation.id == 'list':
                            imported_from_src.add('_list')
                            break
            except Exception:
                pass

        needed: set[str] = set()
        queue: list[str] = list(imported_from_src)
        while queue:
            mod_name: str = queue.pop(0)
            if mod_name in needed:
                continue
            if mod_name in include_file_map:
                needed.add(mod_name)
                src_path: str = include_file_map[mod_name][0]
                includes_dir: str = include_file_map[mod_name][2]
                deps: set[str] = get_file_dependencies(src_path, includes_dir)
                for dep in deps:
                    if dep in include_file_map and dep not in needed:
                        queue.append(dep)

        needed_infos: list[tuple[str, str, str]] = []
        for mod_name in sorted(needed):
            if mod_name in include_file_map:
                info: tuple[str, str, str] = include_file_map[mod_name]
                if info not in needed_infos:
                    needed_infos.append(info)

        return needed_infos

    def run(self) -> None:
        """扫描源目录，只处理入口文件可达的 .py 文件（导入遍历）"""
        py_files: list[str]
        if self.entry_files:
            py_files = list(self.entry_files)
        else:
            main_py: str = os.path.join(self.src_root, 'main.py')
            if os.path.exists(main_py):
                py_files = [main_py]
            else:
                py_files = []
                for root, dirs, files in os.walk(self.src_root):
                    dirs[:] = [d for d in dirs if d not in ('__pycache__',)]
                    for file in files:
                        if file.endswith('.py'):
                            py_files.append(os.path.join(root, file))

        if not py_files:
            _vlog().warning("未找到入口文件或源文件")
            return

        reachable: set[str]
        if self.entry_files:
            reachable = find_reachable_files_from_entries(self.src_root, py_files)
        else:
            reachable = find_reachable_files_from_entries(self.src_root, py_files)

        _vlog().info(f"找到 {len(reachable)} 个可达源文件（从入口遍历）")

        for i, src_path in enumerate(sorted(reachable), 1):
            rel: str = os.path.relpath(src_path, self.src_root)
            _vlog().info(f"[{i}/{len(reachable)}] 生成签名: {rel}")
            try:
                self._process_file_pyi(src_path, rel)
            except Exception as e:
                _vlog().error(f"生成签名失败: {e}")
                traceback.print_exc()

        needed_includes: list[tuple[str, str, str]] = self._get_needed_include_files(reachable)
        self._process_include_py_files_pyi(needed_includes)

        struct_names: set[str]
        enum_names: set[str]
        struct_sha1_map: dict[str, str]
        exception_names: set[str]
        struct_names, enum_names, struct_sha1_map, exception_names = self._build_struct_registry()
        _vlog().info(f"结构体注册表: {len(struct_names)} 个类型, {len(enum_names)} 个枚举")
        for name in sorted(struct_names):
            _vlog().debug(f"  {name}")

        for i, src_path in enumerate(sorted(reachable), 1):
            rel: str = os.path.relpath(src_path, self.src_root)
            try:
                self._process_file_stub(src_path, rel, struct_names, enum_names=enum_names, struct_sha1_map=struct_sha1_map, exception_names=exception_names)
            except Exception as e:
                _vlog().error(f"生成声明失败: {e}")
                traceback.print_exc()

        self._process_include_py_files_stub(struct_names, needed_includes, enum_names=enum_names, struct_sha1_map=struct_sha1_map, exception_names=exception_names)

        _vlog().success(f"声明接口生成到: {self.temp_dir}")
        _vlog().info(f"SHA1 映射表 ({len(self.sha1_map)} 个文件):")
        for sha1, rel in sorted(self.sha1_map.items()):
            _vlog().debug(f"  {sha1} -> {rel}")

    def _collect_include_py_files(self) -> list[tuple[str, str, str]]:
        include_py_files: list[tuple[str, str, str]] = []
        for includes_dir in self.include_dirs:
            if not os.path.isdir(includes_dir):
                continue
            for root, dirs, files in os.walk(includes_dir):
                dirs[:] = [d for d in dirs if not d.startswith('.') and d != '__pycache__']
                for fname in files:
                    if fname.endswith('.py') or fname.endswith('.pyi'):
                        src_path: str = os.path.join(root, fname)
                        rel_from_inc: str = os.path.relpath(src_path, includes_dir)
                        include_py_files.append((src_path, rel_from_inc, includes_dir))
        return include_py_files

    def _process_include_py_files_pyi(self, needed_includes: list[tuple[str, str, str]] | None = None) -> None:
        include_py_files: list[tuple[str, str, str]]
        if needed_includes is not None:
            include_py_files = needed_includes
        else:
            include_py_files = self._collect_include_py_files()
        if not include_py_files:
            return
        _vlog().info(f"处理 {len(include_py_files)} 个被引用的 Python 库文件")
        for src_path, rel_from_inc, includes_dir in include_py_files:
            ModulePath: str = rel_from_inc.replace(os.sep, '.').replace('/', '.')
            module_name: str = os.path.splitext(ModulePath)[0]
            try:
                with open(src_path, 'r', encoding='utf-8') as f:
                    content: str = f.read()
                sha1: str = compute_sha1(content)
                self.sha1_map[sha1] = f"includes/{rel_from_inc}"
                top_module: str = rel_from_inc.split(os.sep)[0].split('/')[0]
                if top_module not in self.include_py_map:
                    self.include_py_map[top_module] = sha1
                self.include_py_map[module_name] = sha1

                sig_path: str = os.path.join(self.temp_dir, f"{sha1}.pyi")
                if os.path.isfile(sig_path):
                    _vlog().info(f"  缓存命中: {rel_from_inc} -> {sha1}.pyi")
                    continue

                sig_content: str = PythonToStubConverter.convert(content, module_name)
                with open(sig_path, 'w', encoding='utf-8', newline='\n') as f:
                    f.write(sig_content)
                _vlog().info(f"  生成签名: {rel_from_inc} -> {sha1}.pyi")
            except Exception as e:
                _vlog().error(f"处理 include 文件失败 {rel_from_inc}: {e}")

    def _collect_typedef_map(self) -> dict[str, ast.AST]:
        typedef_map: dict[str, ast.AST] = {}
        if not os.path.isdir(self.temp_dir):
            return typedef_map
        for fname in os.listdir(self.temp_dir):
            if not fname.endswith('.pyi'):
                continue
            pyi_path: str = os.path.join(self.temp_dir, fname)
            try:
                with open(pyi_path, 'r', encoding='utf-8') as f:
                    content: str = f.read()
                tree: ast.Module = ast.parse(content)
                for node in ast.iter_child_nodes(tree):
                    if isinstance(node, ast.AnnAssign) and isinstance(node.target, ast.Name):
                        var_name: str = node.target.id
                        is_typedef: bool = False
                        if isinstance(node.annotation, ast.Attribute) and hasattr(node.annotation, 'attr') and node.annotation.attr == 'CTypedef':
                            is_typedef = True
                        elif isinstance(node.annotation, ast.Name) and node.annotation.id == 'CTypedef':
                            is_typedef = True
                        elif isinstance(node.annotation, ast.BinOp) and isinstance(node.annotation.left, ast.Attribute) and hasattr(node.annotation.left, 'attr') and node.annotation.left.attr == 'CTypedef':
                            is_typedef = True
                        if is_typedef and node.value and var_name not in typedef_map:
                            typedef_map[var_name] = node.value
            except Exception as _e:
                if _ConfigMode == "strict":
                    raise
                _vlog().warning(f"收集 typedef 映射失败: {_e}", "Exception")
        return typedef_map

    def _process_include_py_files_stub(self, struct_names: set[str], needed_includes: list[tuple[str, str, str]] | None = None, enum_names: set[str] | None = None, struct_sha1_map: dict[str, str] | None = None, exception_names: set[str] | None = None) -> None:
        include_py_files: list[tuple[str, str, str]]
        if needed_includes is not None:
            include_py_files = needed_includes
        else:
            include_py_files = self._collect_include_py_files()
        if not include_py_files:
            return
        typedef_map: dict[str, ast.AST] = self._collect_typedef_map()
        for src_path, rel_from_inc, includes_dir in include_py_files:
            ModulePath: str = rel_from_inc.replace(os.sep, '.').replace('/', '.')
            module_name: str = os.path.splitext(ModulePath)[0]
            try:
                with open(src_path, 'r', encoding='utf-8') as f:
                    content: str = f.read()
                sha1: str = compute_sha1(content)

                stub_path: str = os.path.join(self.temp_dir, f"{sha1}.stub.ll")
                if os.path.isfile(stub_path):
                    _vlog().info(f"  缓存命中: {rel_from_inc} -> {sha1}.stub.ll")
                    continue

                sig_path: str = os.path.join(self.temp_dir, f"{sha1}.pyi")
                with open(sig_path, 'r', encoding='utf-8') as f:
                    sig_content: str = f.read()

                self._generate_decl_ll(sig_content, stub_path, src_path, struct_names, enum_names=enum_names, module_sha1=sha1, struct_sha1_map=struct_sha1_map, exception_names=exception_names, typedef_map=typedef_map)
                _vlog().info(f"  生成声明: {rel_from_inc} -> {sha1}.stub.ll")
            except Exception as e:
                _vlog().error(f"处理 include 文件失败 {rel_from_inc}: {e}")

    def _process_file_pyi(self, src_path: str, rel_path: str) -> None:
        with open(src_path, 'r', encoding='utf-8') as f:
            content: str = f.read()

        sha1: str = compute_sha1(content)
        self.sha1_map[sha1] = rel_path

        sig_path: str = os.path.join(self.temp_dir, f"{sha1}.pyi")
        if os.path.isfile(sig_path):
            _vlog().info(f"  -> {sha1}.pyi (缓存)")
            return

        module_name: str = os.path.splitext(rel_path)[0].replace(os.sep, '.').replace('/', '.')
        sig_content: str = PythonToStubConverter.convert(content, module_name)
        with open(sig_path, 'w', encoding='utf-8', newline='\n') as f:
            f.write(sig_content)
        _vlog().info(f"  -> {sha1}.pyi (签名)")

    def _process_file_stub(self, src_path: str, rel_path: str, struct_names: set[str], enum_names: set[str] | None = None, struct_sha1_map: dict[str, str] | None = None, exception_names: set[str] | None = None) -> None:
        with open(src_path, 'r', encoding='utf-8') as f:
            content: str = f.read()

        sha1: str = compute_sha1(content)
        stub_path: str = os.path.join(self.temp_dir, f"{sha1}.stub.ll")
        if os.path.isfile(stub_path):
            _vlog().info(f"  -> {sha1}.stub.ll (缓存)")
            return

        sig_path: str = os.path.join(self.temp_dir, f"{sha1}.pyi")
        with open(sig_path, 'r', encoding='utf-8') as f:
            sig_content: str = f.read()

        typedef_map: dict[str, ast.AST] = self._collect_typedef_map()
        self._generate_decl_ll(sig_content, stub_path, src_path, struct_names, enum_names=enum_names, module_sha1=sha1, struct_sha1_map=struct_sha1_map, exception_names=exception_names, typedef_map=typedef_map)
        _vlog().info(f"  -> {sha1}.stub.ll (声明)")

    def _build_struct_registry(self) -> tuple[set[str], set[str], dict[str, str], set[str]]:
        struct_names: set[str] = set()
        enum_names: set[str] = set()
        exception_names: set[str] = set()
        struct_sha1_map: dict[str, str] = {}
        valid_sha1_keys: set[str] = set(self.sha1_map.keys())
        for fname in os.listdir(self.temp_dir):
            if not fname.endswith('.pyi'):
                continue
            sha1_key: str = fname.replace('.pyi', '')
            if sha1_key not in valid_sha1_keys:
                continue
            pyi_path: str = os.path.join(self.temp_dir, fname)
            try:
                with open(pyi_path, 'r', encoding='utf-8') as f:
                    content: str = f.read()
                tree: ast.Module = ast.parse(content)
                for node in ast.iter_child_nodes(tree):
                    if isinstance(node, ast.ClassDef):
                        is_enum: bool = False
                        is_exception: bool = False
                        if node.bases:
                            for base in node.bases:
                                if isinstance(base, ast.Attribute) and hasattr(base, 'attr'):
                                    if base.attr in ('CEnum', 'Enum', 'REnum'):
                                        is_enum = True
                                        break
                                    elif base.attr == 'Exception' or base.attr in exception_names:
                                        is_exception = True
                                        break
                                elif isinstance(base, ast.Name) and hasattr(base, 'id'):
                                    if base.id in ('CEnum', 'Enum', 'REnum'):
                                        is_enum = True
                                        break
                                    elif base.id == 'Exception' or base.id in exception_names:
                                        is_exception = True
                                        break
                        # 也检查装饰器形式 @t.CEnum / @t.REnum
                        if not is_enum and not is_exception and hasattr(node, 'decorator_list') and node.decorator_list:
                            for deco in node.decorator_list:
                                deco_attr: str | None = None
                                if isinstance(deco, ast.Attribute) and hasattr(deco, 'attr'):
                                    deco_attr = deco.attr
                                elif isinstance(deco, ast.Name) and hasattr(deco, 'id'):
                                    deco_attr = deco.id
                                if deco_attr in ('CEnum', 'Enum', 'REnum'):
                                    is_enum = True
                                    break
                        if is_enum:
                            enum_names.add(node.name)
                        elif is_exception:
                            exception_names.add(node.name)
                        else:
                            struct_names.add(node.name)
                            struct_sha1_map[node.name] = sha1_key
            except Exception as _e:
                if _ConfigMode == "strict":
                    raise
                _vlog().warning(f"构建结构体/枚举注册表失败: {_e}", "Exception")
        return struct_names, enum_names, struct_sha1_map, exception_names

    def _generate_decl_ll(self, pyi_content: str, ll_path: str, src_path: str, struct_names: set[str] | None = None, enum_names: set[str] | None = None, module_sha1: str | None = None, struct_sha1_map: dict[str, str] | None = None, exception_names: set[str] | None = None, typedef_map: dict[str, ast.AST] | None = None) -> None:
        try:
            decl_gen: DeclarationGenerator = DeclarationGenerator(struct_names=struct_names, enum_names=enum_names, module_sha1=module_sha1, target_triple=self.target_triple, target_datalayout=self.target_datalayout, struct_sha1_map=struct_sha1_map, exception_names=exception_names, typedef_map=typedef_map)
            decl_ll: str = decl_gen.generate(pyi_content, src_path)
            with open(ll_path, 'w', encoding='utf-8', newline='\n') as f:
                f.write(decl_ll)
        except Exception as e:
            _vlog().warning(f".ll 声明生成失败: {e}")
            with open(ll_path, 'w', encoding='utf-8') as f:
                f.write(f"; declaration for {os.path.basename(src_path)}\n; error: {e}\n")