import os
from pathlib import Path

from fastapi import APIRouter, HTTPException
from pydantic import BaseModel

from backend.android_tools import find_apks
from backend.runtime_logs import get_logs, add_log
from backend.shell_runner import run_command

router = APIRouter(prefix='/api/runtime', tags=['runtime'])


def _runtime_env_prefix() -> str:
    runtime_home = os.getenv('DEVCONSOLE_RUNTIME_HOME') or os.getenv('HOME') or '/home/devconsole'
    flutter_home = os.getenv('FLUTTER_HOME') or f'{runtime_home}/flutter'
    android_home = os.getenv('ANDROID_HOME') or os.getenv('ANDROID_SDK_ROOT') or f'{runtime_home}/Android'
    pub_cache = os.getenv('PUB_CACHE') or f'{runtime_home}/.pub-cache'

    return (
        f'export HOME="{runtime_home}" '
        f'PUB_CACHE="{pub_cache}" '
        f'ANDROID_HOME="{android_home}" '
        f'ANDROID_SDK_ROOT="{android_home}" '
        f'PATH="{flutter_home}/bin:{android_home}/cmdline-tools/latest/bin:{android_home}/platform-tools:$PATH" && '
    )


def _flutter(command: str) -> str:
    return f'{_runtime_env_prefix()}flutter {command}'


class RuntimeCommandRequest(BaseModel):
    workspace: str
    command: str
    device: str | None = None
    package_name: str | None = None


def _runtime_commands() -> dict[str, dict]:
    return {
        'git_pull': {
            'label': 'Git Pull',
            'command': 'git pull',
            'timeout': 600,
        },
        'flutter_clean': {
            'label': 'Flutter Clean',
            'command': _flutter('clean'),
            'timeout': 900,
        },
        'flutter_pub_get': {
            'label': 'Flutter Pub Get',
            'command': _flutter('pub get'),
            'timeout': 900,
        },
        'flutter_build_apk': {
            'label': 'Flutter Build APK',
            'command': _flutter('build apk --release'),
            'timeout': 3600,
        },
        'flutter_run_profile': {
            'label': 'Flutter Run Profile',
            'command': _flutter('run --profile'),
            'timeout': 1800,
            'device': True,
        },
        'adb_reconnect': {
            'label': 'ADB Reconnect',
            'command': f'{_runtime_env_prefix()}adb reconnect',
            'timeout': 120,
        },
        'adb_logcat': {
            'label': 'ADB Logcat Snapshot',
            'command': f'{_runtime_env_prefix()}adb logcat -d -t 300',
            'timeout': 120,
            'device': True,
        },
    }


def _workspace_cwd(workspace: str) -> str:
    path = Path(workspace).resolve()
    if not path.exists():
        raise HTTPException(status_code=400, detail='Workspace path does not exist')
    return path.as_posix()


def _with_device(command: str, device: str | None, enabled: bool) -> str:
    if not enabled or not device:
        return command

    if 'adb ' in command:
        return command.replace('adb ', f'adb -s {device} ', 1)

    if 'flutter ' in command and ' -d ' not in command:
        return f'{command} -d {device}'

    return command


@router.get('/logs')
async def runtime_logs():
    return {
        'success': True,
        'logs': get_logs(),
    }


@router.get('/commands')
async def runtime_commands():
    return {
        'success': True,
        'commands': [
            {
                'id': command_id,
                'label': config['label'],
                'needs_device': bool(config.get('device')),
            }
            for command_id, config in _runtime_commands().items()
        ],
    }


@router.post('/event')
async def runtime_event(payload: dict):
    message = payload.get('message', 'unknown runtime event')
    add_log(message)
    return {'success': True, 'message': message}


@router.post('/command')
async def runtime_command(payload: RuntimeCommandRequest):
    commands = _runtime_commands()
    config = commands.get(payload.command)

    if not config:
        raise HTTPException(status_code=400, detail='Runtime command is not allowed')

    cwd = _workspace_cwd(payload.workspace)
    command = _with_device(
        config['command'],
        payload.device,
        bool(config.get('device')),
    )

    add_log(f"Runtime command started: {config['label']}")

    result = run_command(command, cwd, timeout=int(config.get('timeout', 900)))

    add_log(
        f"Runtime command finished: {config['label']} "
        f"(exit {result['returncode']})"
    )

    return {
        'success': result['returncode'] == 0,
        'command': payload.command,
        'label': config['label'],
        'result': result,
    }


@router.post('/install-latest-apk')
async def runtime_install_latest_apk(payload: RuntimeCommandRequest):
    cwd = _workspace_cwd(payload.workspace)
    apks = find_apks(cwd)

    if not apks:
        raise HTTPException(status_code=404, detail='APK not found. Build project first.')

    adb = f'{_runtime_env_prefix()}adb'
    if payload.device:
        adb = f'{_runtime_env_prefix()}adb -s {payload.device}'

    command = f'{adb} install -r "{apks[0]}"'

    add_log(f'Runtime APK install started: {apks[0]}')
    result = run_command(command, cwd, timeout=900)
    add_log(f"Runtime APK install finished (exit {result['returncode']})")

    return {
        'success': result['returncode'] == 0,
        'apk': apks[0],
        'device': payload.device,
        'result': result,
    }


@router.post('/restart-app')
async def runtime_restart_app(payload: RuntimeCommandRequest):
    if not payload.package_name:
        raise HTTPException(status_code=400, detail='package_name is required')

    cwd = _workspace_cwd(payload.workspace)
    adb = f'{_runtime_env_prefix()}adb'
    if payload.device:
        adb = f'{_runtime_env_prefix()}adb -s {payload.device}'

    command = f'{adb} shell monkey -p {payload.package_name} 1'

    add_log(f'Runtime app restart requested: {payload.package_name}')
    result = run_command(command, cwd, timeout=120)
    add_log(f"Runtime app restart finished (exit {result['returncode']})")

    return {
        'success': result['returncode'] == 0,
        'package_name': payload.package_name,
        'device': payload.device,
        'result': result,
    }