#!/usr/bin/env python3
"""
isort Parser - Import Sorting and Organization Analysis.
=========================================================

isort is a Python utility to sort imports alphabetically and automatically
separate them into sections. This module provides structured parsing of
isort output and configuration.

Implementation Status: NOT IMPLEMENTED
Priority: P2 - HIGH

    - [ ] P2-ISORT-001: Parse isort output format
    - [ ] P2-ISORT-002: Configuration parsing (setup.cfg, pyproject.toml)
    - [ ] P2-ISORT-003: Import grouping analysis
    - [ ] P2-ISORT-004: Sorting correctness checking
    - [ ] P2-ISORT-005: Multi-line import handling

==============================================================================
PLANNED [P2-ISORT-001]: isortParser for import organization
==============================================================================
Priority: HIGH
Status: ⏳ NOT IMPLEMENTED

Planned Features:
    - [ ] Parse isort --check-only --diff output
    - [ ] Identify unsorted import sections
    - [ ] Track import categories (stdlib, third-party, local, future)
    - [ ] Analyze import line length violations
    - [ ] Support --profile configurations (black, django, flask, etc.)
    - [ ] Handle from imports vs regular imports
    - [ ] Track circular import detection

    isort --check-only --diff will produce:
    ```
    import os
    import sys

    from third_party import something
    from . import local_module
    ```

Data Structures (Planned):
    ```python
    @dataclass
    class ImportGroup:
        category: str  # "future", "stdlib", "third-party", "local"
        imports: list[str]
        line_range: tuple[int, int]

    @dataclass
    class ImportIssue:
        issue_type: str  # "unsorted", "wrong-category", "line-too-long"
        location: SourceLocation
        current_order: list[str]
        expected_order: list[str]
        message: str

    @dataclass
    class IsortReport:
        file_path: str
        issues: list[ImportIssue]
        groups: list[ImportGroup]
        is_properly_sorted: bool
        diff: str | None  # Unified diff if --diff used
    ```

Test Cases (Planned):
    - Parse unsorted imports
    - Verify section separation (future, stdlib, third-party, local)
    - Handle multi-line imports
    - Verify import grouping
    - Test different profiles (black, django, flask)

    - [ ] Load from setup.cfg [isort] section
    - [ ] Load from pyproject.toml [tool.isort] section
    - [ ] Load from .isort.cfg file
    - [ ] Support --profile parameter

Related Features:
    - Integrates with AST parser for import analysis
    - Complements Pylint's import-related checks
    - Works with autopep8 and Black for formatting

Notes for Implementation:
    - isort can be run as a library via isort.api or subprocess
    - Primary use case: ensure consistent import ordering
    - Useful for identifying import organization patterns
    - Can be used as both validator and auto-fixer
    - Important for code consistency in teams

API Design (Planned):
    ```python
    class IsortParser:
        def __init__(self, profile: str = "black"):
            self.profile = profile

        def analyze_file(self, path: str) -> IsortReport:
            '''Check if file has properly sorted imports.'''
            pass

        def analyze_code(self, code: str, filename: str = "<string>") -> IsortReport:
            '''Analyze import order in code string.'''
            pass

        def get_fixed_code(self, code: str) -> str:
            '''Return code with sorted imports.'''
            pass

        def load_config(self, config_file: str) -> None:
            '''Load configuration from isort config file.'''
            pass
    ```
"""

from __future__ import annotations

from dataclasses import dataclass, field
from pathlib import Path


@dataclass
class SourceLocation:
    """Location in source code."""

    line: int
    column: int
    end_line: int | None = None
    end_column: int | None = None


@dataclass
class ImportGroup:
    """Represents a group of imports (future, stdlib, third-party, local)."""

    category: str  # "future", "stdlib", "third-party", "local"
    imports: list[str] = field(default_factory=list)
    line_range: tuple[int, int] | None = None
    properly_sorted: bool = True


@dataclass
class ImportIssue:
    """Represents an import sorting issue."""

    issue_type: str  # "unsorted", "wrong-category", "line-too-long", "circular"
    location: SourceLocation
    current_order: list[str] = field(default_factory=list)
    expected_order: list[str] = field(default_factory=list)
    message: str = ""


@dataclass
class IsortConfig:
    """Configuration for isort parser."""

    profile: str = "black"
    line_length: int = 88
    multi_line_mode: int = 3  # 0-10, mode for multi-line imports
    include_trailing_comma: bool = True
    force_single_line: bool = False
    use_parentheses: bool = True
    ensure_newline_before_comments: bool = False
    skip_glob: list[str] = field(default_factory=list)
    known_first_party: list[str] = field(default_factory=list)
    known_third_party: list[str] = field(default_factory=list)

    @classmethod
    def from_pyproject(cls, pyproject_path: str | Path) -> IsortConfig:
        """Load configuration from pyproject.toml."""
        return cls()

    @classmethod
    def from_file(cls, config_path: str | Path) -> IsortConfig:
        """Load configuration from .isort.cfg or setup.cfg."""
        return cls()


@dataclass
class IsortReport:
    """Results from isort analysis."""

    file_path: str
    is_properly_sorted: bool = True
    issues: list[ImportIssue] = field(default_factory=list)
    groups: list[ImportGroup] = field(default_factory=list)
    diff: str | None = None
    error: str | None = None


class IsortParser:
    """
    Parser for import organization using isort.

    STATUS: NOT IMPLEMENTED
    PRIORITY: P2 - HIGH

    Features (Planned):
        - Check import sorting against isort rules
        - Support multiple profiles (black, django, flask, etc.)
        - Identify import categories and grouping
        - Detect unsorted imports
        - Multi-line import handling
        - Configuration parsing

        - Implement analyze_file() method
        - Implement analyze_code() method
        - Add configuration support
        - Add profile support
        - Implement diff generation
    """

    def __init__(self, config: IsortConfig | None = None):
        """
        Initialize isort parser.

        Args:
            config: IsortConfig instance or None to use defaults
        """
        self.config = config or IsortConfig()

    def analyze_file(self, file_path: str | Path) -> IsortReport:
        """
        Analyze import sorting in a Python file.

        Args:
            file_path: Path to Python file

        Returns:
            IsortReport with sorting analysis results

        """
        raise NotImplementedError("IsortParser.analyze_file() not yet implemented")

    def analyze_code(self, code: str, filename: str = "<string>") -> IsortReport:
        """
        Analyze import sorting in Python code string.

        Args:
            code: Python source code
            filename: Filename for error reporting

        Returns:
            IsortReport with sorting analysis results

        """
        raise NotImplementedError("IsortParser.analyze_code() not yet implemented")

    def get_fixed_code(self, code: str) -> str:
        """
        Get code with properly sorted imports.

        Args:
            code: Python source code

        Returns:
            Code with sorted imports

        """
        raise NotImplementedError("IsortParser.get_fixed_code() not yet implemented")

    def load_config(self, config_path: str | Path) -> None:
        """
        Load configuration from isort config file.

        Args:
            config_path: Path to .isort.cfg or setup.cfg

        """
        raise NotImplementedError("IsortParser.load_config() not yet implemented")
