"""首页任务奖励领取流程。"""
import time

from .engine import WorkflowError


class TaskRunner:
    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 observe(self):
        screenshot = self.desktop.screenshot()
        region = self.region_provider(screenshot)
        return screenshot, region, self.matcher.frame(screenshot, region)

    def wait(self, *names):
        deadline = time.monotonic() + self.timeout
        previous, stable = None, 0
        while time.monotonic() < deadline:
            screenshot, region, frame = self.observe()
            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, frame
            time.sleep(0.25)
        raise WorkflowError('未识别到预期页面 ' + '/'.join(names) + '，已停止。')

    def click(self, point, screenshot, region, hold=0.2):
        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(point, region, screenshot.size, hold=hold)

    def click_action(self, action, observation):
        _, screenshot, region, _ = observation
        self.click(self.flow['clicks'][action], screenshot, region)
        self.log('已执行：' + action)

    def claim_location(self, frame):
        spec = self.flow['claim_button']
        score, location = self.matcher.locate(frame, spec)
        if score < spec.get('threshold', 0.86):
            return None
        x, y, width, height = location
        return ((x + width / 2) / 562, (y + height / 2) / 1002)

    def panel_dot(self, frame, panel):
        spec = self.flow['tab_dots'][panel]
        return self.matcher.score(frame, spec) >= spec.get('threshold', 0.86)

    def claim_panel(self, panel):
        count = 0
        while count < self.flow['max_claims_per_panel']:
            name, screenshot, region, frame = self.wait(panel)
            location = self.claim_location(frame)
            if location is None:
                return count
            self.click(location, screenshot, region, hold=0.8)
            count += 1
            self.log('已执行：%s 第 %s 个领取按钮。' % (panel, count))
            reward = self.wait('reward')
            self.click_action('dismiss_reward', reward)
        raise WorkflowError('单个面板领取次数超过安全上限，已停止。')

    def close_and_home(self):
        panel = self.wait('daily', 'weekly')
        self.click_action('close', panel)
        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：检测任务红点 → 日常/周常领取 → 关闭任务 → 返回首页。未点击。')
            return 'preview'

        _, screenshot, region, frame = home
        if not self.matcher.matches(frame, self.flow['task_dot']):
            self.log('任务按钮没有红点，本次不进入任务面板。')
            return 'no_task_dot'
        self.click_action('open_tasks', home)
        panel = self.wait('daily', 'weekly')
        current = panel[0]
        claimed = self.claim_panel(current)
        self.log('%s 面板领取 %s 个奖励。' % (current, claimed))

        other = 'weekly' if current == 'daily' else 'daily'
        _, screenshot, region, frame = self.wait(current)
        if self.panel_dot(frame, other):
            self.click_action('open_' + other, (current, screenshot, region, frame))
            claimed += self.claim_panel(other)
            self.log('%s 面板领取完成。' % other)
        else:
            self.log('%s 标签没有红点，不切换。' % other)
        self.close_and_home()
        return 'claimed' if claimed else 'no_claim_button'