import ast
import sys
from pathlib import Path

ROOT_DIR = Path(__file__).parent.parent

class IndentationCorrector(ast.NodeVisitor):
    def __init__(self, source_lines: list[str]):
        self.source_lines = source_lines
        self.new_lines: list[str] = []
        self._indentation_stack: list[int] = [0]

    def visit_Module(self, node: ast.Module):
        self._process_lines(0, 0)
        for child in node.body:
            self._walk_node(child, 0)
        self.generic_visit(node)

    def _walk_node(self, node: ast.AST, depth: int):
        if isinstance(node, (ast.FunctionDef, ast.AsyncFunctionDef, ast.ClassDef)):
            line_no = node.lineno - 1
            actual_indent = self._get_indent(line_no)
            expected_indent = depth
            self._process_lines(line_no, expected_indent)
            self._indentation_stack.append(depth + 1)
            for child in node.body:
                self._walk_node(child, depth + 1)
            self._indentation_stack.pop()
        elif isinstance(node, ast.If):
            line_no = node.lineno - 1
            self._process_lines(line_no, depth)
            for child in node.body:
                self._walk_node(child, depth + 1)
            if node.orelse:
                self._walk_node(node.orelse, depth + 1)
        elif isinstance(node, (ast.For, ast.While, ast.With)):
            line_no = node.lineno - 1
            self._process_lines(line_no, depth)
            for child in node.body:
                self._walk_node(child, depth + 1)
            if isinstance(node, ast.For) and node.orelse:
                self._walk_node(node.orelse, depth + 1)
        elif isinstance(node, ast.Try):
            for child in node.body:
                self._walk_node(child, depth + 1)
            for handler in node.handlers:
                self._walk_node(handler, depth + 1)
            if node.orelse:
                self._walk_node(node.orelse, depth + 1)
            if node.finalbody:
                self._walk_node(node.finalbody, depth + 1)
        else:
            self.generic_visit(node)

    def _get_indent(self, lineno: int) -> int:
        if lineno < 0 or lineno >= len(self.source_lines):
            return 0
        line = self.source_lines[lineno]
        stripped = line.lstrip()
        return len(line) - len(stripped)

    def _process_lines(self, end_line: int, expected_indent: int):
        pass

def correct_file(filepath: Path) -> tuple[bool, str]:
    try:
        with open(filepath, "r", encoding="utf-8", newline="") as f:
            source = f.read()
        source_lines = source.splitlines()
        tree = ast.parse(source, filename=str(filepath))
        corrector = IndentationCorrector(source_lines)
        corrector.visit(tree)
        return False, "Not implemented yet"
    except Exception as e:
        return False, str(e)

def fix_indentation_simple(filepath: Path, base_indent: int = 4, target_indent: int = 1) -> tuple[bool, str]:
    try:
        with open(filepath, "r", encoding="utf-8", newline="") as f:
            lines = f.readlines()

        new_lines = []
        changed = False
        for line in lines:
            stripped = line.lstrip()
            if not stripped:
                new_lines.append(line)
                continue

            leading = len(line) - len(stripped)
            if leading > 0:
                old_level = leading // base_indent
                new_leading = old_level * target_indent
                if leading != new_leading:
                    new_lines.append(" " * new_leading + stripped + "\n" if not line.endswith("\n") else " " * new_leading + stripped)
                    changed = True
                else:
                    new_lines.append(line)
            else:
                new_lines.append(line)

        if changed:
            with open(filepath, "w", encoding="utf-8", newline="") as f:
                f.writelines(new_lines)
            return True, "Fixed"

        return False, "No changes needed"
    except Exception as e:
        return False, str(e)

def main():
    if len(sys.argv) > 2:
        filepath = Path(sys.argv[2])
        base_indent = int(sys.argv[3]) if len(sys.argv) > 3 else 4
        target_indent = int(sys.argv[4]) if len(sys.argv) > 4 else 1
        changed, msg = fix_indentation_simple(filepath, base_indent, target_indent)
        print(f"{filepath}: {msg}")
        return

    files_to_fix = [
        ("src/fuzzy_anchor.py", 4, 1),
        ("src/patch_modal.py", 2, 1),
        ("scripts/extract_symbols.py", 4, 1),
        ("scripts/tasks/download_fonts.py", 4, 1),
    ]

    test_files = [
        ("tests/test_arch_boundary_phase1.py", 2, 1),
        ("tests/test_arch_boundary_phase2.py", 2, 1),
        ("tests/test_arch_boundary_phase3.py", 2, 1),
        ("tests/test_external_editor.py", 4, 1),
        ("tests/test_headless_service.py", 4, 1),
        ("tests/test_history_manager.py", 4, 1),
        ("tests/test_fuzzy_anchor.py", 4, 1),
        ("tests/test_gemini_cli_adapter.py", 4, 1),
        ("tests/test_ai_client_cli.py", 4, 1),
        ("tests/test_api_events.py", 4, 1),
        ("tests/test_context_composition_decoupled.py", 4, 1),
        ("tests/test_context_composition_phase3.py", 4, 1),
        ("tests/test_context_composition_phase4.py", 4, 1),
        ("tests/test_diff_viewer.py", 2, 1),
        ("tests/test_discussion_takes_gui.py", 4, 1),
        ("tests/test_external_mcp_hitl.py", 4, 1),
        ("tests/test_gui_discussion_tabs.py", 4, 1),
        ("tests/test_gui_stress_performance.py", 4, 1),
        ("tests/test_gui_updates.py", 2, 1),
        ("tests/test_hot_reloader.py", 4, 1),
        ("tests/test_mma_dashboard_refresh.py", 4, 1),
        ("tests/test_mma_node_editor.py", 4, 1),
        ("tests/test_mma_orchestration_gui.py", 4, 1),
        ("tests/test_py_struct_tools.py", 4, 1),
        ("tests/test_thinking_persistence.py", 4, 1),
        ("tests/test_tier4_interceptor.py", 2, 1),
        ("tests/test_tiered_aggregation.py", 4, 1),
        ("tests/test_visual_orchestration.py", 4, 1),
    ]

    all_files = files_to_fix + test_files

    for rel_path, base, target in all_files:
        filepath = ROOT_DIR / rel_path
        if filepath.exists():
            changed, msg = fix_indentation_simple(filepath, base, target)
            print(f"{rel_path}: {msg}")

if __name__ == "__main__":
    main()