from __future__ import annotations

import json
from dataclasses import dataclass
from pathlib import Path

ARCHIVE_ROOT = Path(__file__).resolve().parent.parent / 'archive' / 'claude_code_ts_snapshot' / 'src'
CURRENT_ROOT = Path(__file__).resolve().parent
REFERENCE_SURFACE_PATH = CURRENT_ROOT / 'reference_data' / 'archive_surface_snapshot.json'
COMMAND_SNAPSHOT_PATH = CURRENT_ROOT / 'reference_data' / 'commands_snapshot.json'
TOOL_SNAPSHOT_PATH = CURRENT_ROOT / 'reference_data' / 'tools_snapshot.json'

ARCHIVE_ROOT_FILES = {
    'QueryEngine.ts': 'QueryEngine.py',
    'Task.ts': 'task.py',
    'Tool.ts': 'Tool.py',
    'commands.ts': 'commands.py',
    'context.ts': 'context.py',
    'cost-tracker.ts': 'cost_tracker.py',
    'costHook.ts': 'costHook.py',
    'dialogLaunchers.tsx': 'dialogLaunchers.py',
    'history.ts': 'history.py',
    'ink.ts': 'ink.py',
    'interactiveHelpers.tsx': 'interactiveHelpers.py',
    'main.tsx': 'main.py',
    'projectOnboardingState.ts': 'projectOnboardingState.py',
    'query.ts': 'query.py',
    'replLauncher.tsx': 'replLauncher.py',
    'setup.ts': 'setup.py',
    'tasks.ts': 'tasks.py',
    'tools.ts': 'tools.py',
}

ARCHIVE_DIR_MAPPINGS = {
    'assistant': 'assistant',
    'bootstrap': 'bootstrap',
    'bridge': 'bridge',
    'buddy': 'buddy',
    'cli': 'cli',
    'commands': 'commands.py',
    'components': 'components',
    'constants': 'constants',
    'context': 'context.py',
    'coordinator': 'coordinator',
    'entrypoints': 'entrypoints',
    'hooks': 'hooks',
    'ink': 'ink.py',
    'keybindings': 'keybindings',
    'memdir': 'memdir',
    'migrations': 'migrations',
    'moreright': 'moreright',
    'native-ts': 'native_ts',
    'outputStyles': 'outputStyles',
    'plugins': 'plugins',
    'query': 'query.py',
    'remote': 'remote',
    'schemas': 'schemas',
    'screens': 'screens',
    'server': 'server',
    'services': 'services',
    'skills': 'skills',
    'state': 'state',
    'tasks': 'tasks.py',
    'tools': 'tools.py',
    'types': 'types',
    'upstreamproxy': 'upstreamproxy',
    'utils': 'utils',
    'vim': 'vim',
    'voice': 'voice',
}


@dataclass(frozen=True)
class ParityAuditResult:
    archive_present: bool
    root_file_coverage: tuple[int, int]
    directory_coverage: tuple[int, int]
    total_file_ratio: tuple[int, int]
    command_entry_ratio: tuple[int, int]
    tool_entry_ratio: tuple[int, int]
    missing_root_targets: tuple[str, ...]
    missing_directory_targets: tuple[str, ...]

    def to_markdown(self) -> str:
        lines = ['# Parity Audit']
        if not self.archive_present:
            lines.append('Local archive unavailable; parity audit cannot compare against the original snapshot.')
            return '\n'.join(lines)

        lines.extend([
            '',
            f'Root file coverage: **{self.root_file_coverage[0]}/{self.root_file_coverage[1]}**',
            f'Directory coverage: **{self.directory_coverage[0]}/{self.directory_coverage[1]}**',
            f'Total Python files vs archived TS-like files: **{self.total_file_ratio[0]}/{self.total_file_ratio[1]}**',
            f'Command entry coverage: **{self.command_entry_ratio[0]}/{self.command_entry_ratio[1]}**',
            f'Tool entry coverage: **{self.tool_entry_ratio[0]}/{self.tool_entry_ratio[1]}**',
            '',
            'Missing root targets:',
        ])
        if self.missing_root_targets:
            lines.extend(f'- {item}' for item in self.missing_root_targets)
        else:
            lines.append('- none')

        lines.extend(['', 'Missing directory targets:'])
        if self.missing_directory_targets:
            lines.extend(f'- {item}' for item in self.missing_directory_targets)
        else:
            lines.append('- none')
        return '\n'.join(lines)


def _reference_surface() -> dict[str, object]:
    return json.loads(REFERENCE_SURFACE_PATH.read_text())


def _snapshot_count(path: Path) -> int:
    return len(json.loads(path.read_text()))


def run_parity_audit() -> ParityAuditResult:
    current_entries = {path.name for path in CURRENT_ROOT.iterdir()}
    root_hits = [target for target in ARCHIVE_ROOT_FILES.values() if target in current_entries]
    dir_hits = [target for target in ARCHIVE_DIR_MAPPINGS.values() if target in current_entries]
    missing_roots = tuple(target for target in ARCHIVE_ROOT_FILES.values() if target not in current_entries)
    missing_dirs = tuple(target for target in ARCHIVE_DIR_MAPPINGS.values() if target not in current_entries)
    current_python_files = sum(1 for path in CURRENT_ROOT.rglob('*.py') if path.is_file())
    reference = _reference_surface()
    return ParityAuditResult(
        archive_present=ARCHIVE_ROOT.exists(),
        root_file_coverage=(len(root_hits), len(ARCHIVE_ROOT_FILES)),
        directory_coverage=(len(dir_hits), len(ARCHIVE_DIR_MAPPINGS)),
        total_file_ratio=(current_python_files, int(reference['total_ts_like_files'])),
        command_entry_ratio=(_snapshot_count(COMMAND_SNAPSHOT_PATH), int(reference['command_entry_count'])),
        tool_entry_ratio=(_snapshot_count(TOOL_SNAPSHOT_PATH), int(reference['tool_entry_count'])),
        missing_root_targets=missing_roots,
        missing_directory_targets=missing_dirs,
    )