"""领地食堂体力领取流程。"""
import time

from .engine import WorkflowError


class StaminaRunner:
    def __init__(self, desktop, matcher, flow, region_provider, log=print, timeout=12):
        self.desktop = desktop
        self.matcher = matcher
        self.flow = flow
        self.region_provider = region_provider
        self.log = log
        self.timeout = timeout

    def wait(self, *names):
        deadline = time.monotonic() + self.timeout
        previous, stable = None, 0
        while time.monotonic() < deadline:
            screenshot = self.desktop.screenshot()
            region = self.region_provider(screenshot)
            frame = self.matcher.frame(screenshot, region)
            found = next((name for name in names
                          if self.matcher.matches(frame, self.flow['states'][name])), None)
            stable = stable + 1 if found and found == previous else 1 if found else 0
            previous = found
            if stable >= 2:
                return found, screenshot, region
            time.sleep(0.25)
        raise WorkflowError('未识别到预期页面 ' + '/'.join(names) + '，已停止。')

    def click(self, action, observation):
        _, screenshot, region = observation
        if self.region_provider(screenshot) != region:
            raise WorkflowError('识别后游戏窗口移动，已停止，请重新运行。')
        self.desktop.click(self.flow['clicks'][action], region, screenshot.size)
        self.log('已执行：' + action)

    def close_and_return(self, canteen):
        self.click('close_canteen', canteen)
        self.click('territory_back', self.wait('territory'))
        self.wait('home')
        self.log('已确认返回首页。')

    def run(self, dry_run=False):
        home = self.wait('home')
        if dry_run:
            self.log('首页识别通过。计划：领地 → 食堂 → 发现一键领取时领体力 → 返回首页。未点击。')
            return 'preview'

        self.click('territory', home)
        self.click('canteen', self.wait('territory'))
        canteen = self.wait('available', 'empty')
        if canteen[0] == 'empty':
            self.log('食堂没有可领取体力，本次跳过。')
            self.close_and_return(canteen)
            return 'no_stamina'

        self.click('claim', canteen)
        reward = self.wait('reward')
        self.log('已确认获得体力奖励弹框。')
        self.click('dismiss_reward', reward)
        empty = self.wait('empty')
        self.log('已确认食堂进入无可领体力状态。')
        self.close_and_return(empty)
        return 'claimed'