<?php
declare(strict_types=1);

namespace app\smt\service;

use app\smt\model\SmokeQuitPlan;
use app\smt\model\SmokeQuitPlanDay;
use app\smt\model\SmokeUserProfile;
use think\facade\Db;

class QuitPlanService
{
    public const STATUS_ACTIVE = 'active';
    public const STATUS_FAILED = 'failed';

    public const STAGE_RECORDING = 'recording';
    public const STAGE_REDUCING = 'reducing';
    public const STAGE_CONSOLIDATING = 'consolidating';

    public function generate(int $userId, array $data = []): array
    {
        if ($this->findActivePlan($userId)) {
            throw new \RuntimeException('已有进行中的戒烟计划，请先重置', 409);
        }

        $profile = SmokeUserProfile::findByUid($userId);
        if (!$profile || (int) $profile->baseline_cigs_per_day <= 0) {
            throw new \RuntimeException('请先完成个人资料填写', 400);
        }

        $startDate = Support::parseDate((string) ($data['start_date'] ?? ''), 'start_date') ?? Support::dateOnly();
        $endDate = $startDate->modify('+29 day');
        $days = $this->buildPlanDays($profile->toArray(), $startDate);
        $now = time();
        $summary = $this->buildSummary($profile->toArray());

        Db::connect('mysql')->transaction(function () use ($userId, $profile, $startDate, $endDate, $days, $summary, $now) {
            $plan = new SmokeQuitPlan();
            $plan->uid = $userId;
            $plan->status = self::STATUS_ACTIVE;
            $plan->start_date = $startDate->format(Support::DATE_LAYOUT);
            $plan->end_date = $endDate->format(Support::DATE_LAYOUT);
            $plan->baseline_cigs_per_day = (int) $profile->baseline_cigs_per_day;
            $plan->smoking_years = (float) $profile->smoking_years;
            $plan->pack_price_cent = (int) $profile->pack_price_cent;
            $plan->current_stage = self::STAGE_RECORDING;
            $plan->current_day = 1;
            $plan->completed_days = 0;
            $plan->prompt_version = 'rule_v1';
            $plan->provider = 'built-in';
            $plan->model = 'rule-based';
            $plan->summary = $summary;
            $plan->createtime = $now;
            $plan->updatetime = $now;
            $plan->save();

            foreach ($days as $day) {
                $row = new SmokeQuitPlanDay();
                $row->plan_id = (int) $plan->id;
                $row->uid = $userId;
                $row->plan_date = $day['plan_date'];
                $row->stage = $day['stage'];
                $row->day = $day['day'];
                $row->target_cigs = $day['target_cigs'];
                $row->target_reduced = $day['target_reduced'] ? 1 : 0;
                $row->advice = $day['advice'];
                $row->createtime = $now;
                $row->updatetime = $now;
                $row->save();
            }
        });

        return $this->getActivePlan($userId);
    }

    public function reset(int $userId, array $data = []): array
    {
        $existing = $this->findActivePlan($userId);
        if ($existing) {
            $existing->status = self::STATUS_FAILED;
            $existing->updatetime = time();
            $existing->save();
        }

        return $this->generate($userId, $data);
    }

    public function getActivePlan(int $userId): array
    {
        $plan = $this->findActivePlan($userId);
        if (!$plan) {
            throw new \RuntimeException('暂无进行中的戒烟计划', 404);
        }

        $today = Support::dateOnly();
        $startDate = Support::dateOnly((string) $plan->start_date);
        if ($today < $startDate) {
            $currentDay = 1;
        } else {
            $currentDay = max(1, min(30, (int) $startDate->diff($today)->days + 1));
        }

        $currentStage = $this->resolveStageByDay($currentDay);
        $dayPlan = SmokeQuitPlanDay::where('uid', $userId)
            ->where('plan_date', $today->format(Support::DATE_LAYOUT))
            ->whereNull('deleted_at')
            ->find();

        return [
            'id' => (int) $plan->id,
            'status' => (string) $plan->status,
            'start_date' => (string) $plan->start_date,
            'end_date' => (string) $plan->end_date,
            'current_stage' => $currentStage,
            'current_day' => $currentDay,
            'completed_days' => (int) $plan->completed_days,
            'baseline_cigs' => (int) $plan->baseline_cigs_per_day,
            'summary' => (string) $plan->summary,
            'today_target' => $dayPlan ? (int) $dayPlan->target_cigs : null,
            'today_advice' => $dayPlan ? (string) $dayPlan->advice : null,
        ];
    }

    public function getPlanDays(int $userId, ?int $planId = null): array
    {
        if ($planId === null || $planId <= 0) {
            $active = $this->findActivePlan($userId);
            if (!$active) {
                throw new \RuntimeException('暂无进行中的戒烟计划', 404);
            }
            $planId = (int) $active->id;
        }

        $plan = SmokeQuitPlan::where('id', $planId)->where('uid', $userId)->whereNull('deleted_at')->find();
        if (!$plan) {
            throw new \RuntimeException('戒烟计划不存在', 404);
        }

        $rows = SmokeQuitPlanDay::where('plan_id', $planId)
            ->whereNull('deleted_at')
            ->order('day', 'asc')
            ->select()
            ->all();

        $days = array_map(static function ($row) {
            return [
                'day' => (int) $row->day,
                'plan_date' => (string) $row->plan_date,
                'stage' => (string) $row->stage,
                'target_cigs' => (int) $row->target_cigs,
                'target_reduced' => (bool) $row->target_reduced,
                'advice' => (string) $row->advice,
                'actual_cigs' => $row->actual_cigs !== null ? (int) $row->actual_cigs : null,
                'resisted_cnt' => $row->resisted_cnt !== null ? (int) $row->resisted_cnt : null,
                'achieved' => $row->achieved !== null ? (bool) $row->achieved : null,
            ];
        }, $rows);

        return [
            'plan_id' => $planId,
            'days' => $days,
        ];
    }

    private function findActivePlan(int $userId): ?SmokeQuitPlan
    {
        return SmokeQuitPlan::where('uid', $userId)
            ->where('status', self::STATUS_ACTIVE)
            ->whereNull('deleted_at')
            ->find();
    }

    private function buildPlanDays(array $profile, \DateTimeImmutable $startDate): array
    {
        $baseline = max(1, (int) ($profile['baseline_cigs_per_day'] ?? 0));
        $quitMotivation = Support::jsonArray($profile['quit_motivations'] ?? []);
        $smokeMotivation = Support::jsonArray($profile['smoke_motivations'] ?? []);
        $days = [];
        $previousTarget = $baseline;
        $reducingFloor = max(1, (int) round($baseline * 0.4));

        for ($day = 1; $day <= 30; $day++) {
            $stage = $this->resolveStageByDay($day);
            if ($day <= 7) {
                $target = $baseline;
            } elseif ($day <= 21) {
                $progress = ($day - 8) / 13;
                $target = (int) round($baseline - (($baseline - $reducingFloor) * $progress));
            } else {
                $progress = ($day - 22) / 8;
                $target = (int) round($reducingFloor * (1 - $progress));
            }

            $target = max(0, min($baseline, $target));
            $days[] = [
                'day' => $day,
                'plan_date' => $startDate->modify('+' . ($day - 1) . ' day')->format(Support::DATE_LAYOUT),
                'stage' => $stage,
                'target_cigs' => $target,
                'target_reduced' => $day > 1 && $target < $previousTarget,
                'advice' => $this->buildDayAdvice($stage, $target, $quitMotivation, $smokeMotivation),
            ];
            $previousTarget = $target;
        }

        return $days;
    }

    private function buildSummary(array $profile): string
    {
        $baseline = max(1, (int) ($profile['baseline_cigs_per_day'] ?? 0));
        $motivation = Support::jsonArray($profile['quit_motivations'] ?? []);
        $goal = $motivation[0] ?? '让自己回到更轻松的状态';

        return sprintf(
            '这是一个 30 天的渐进式戒烟计划：前 7 天建立稳定记录，第 8-21 天逐步减量，最后 9 天把目标压低到接近清零。请始终把“%s”作为你每天复盘时的提醒。当前基线按日均 %d 支计算。',
            $goal,
            $baseline
        );
    }

    private function buildDayAdvice(string $stage, int $target, array $quitMotivation, array $smokeMotivation): string
    {
        $quitLine = $quitMotivation[0] ?? '提醒自己坚持的理由';
        $smokeLine = $smokeMotivation[0] ?? '高压或社交场景';

        if ($stage === self::STAGE_RECORDING) {
            return sprintf('今天先把记录做完整，目标控制在 %d 支以内。特别留意 %s 这些触发场景，先不急着求完美，把每次想抽前的情绪和时间点记下来。', $target, $smokeLine);
        }
        if ($stage === self::STAGE_REDUCING) {
            return sprintf('今天目标降到 %d 支。把最容易多抽的一个时段延后 10-15 分钟，用喝水、走动或深呼吸替代，复盘时提醒自己：%s。', $target, $quitLine);
        }

        return sprintf('今天进入巩固期，目标控制在 %d 支。优先守住“第一根烟”和“最晚一根烟”两个节点，把注意力放在连续完成目标上，继续记住：%s。', $target, $quitLine);
    }

    private function resolveStageByDay(int $day): string
    {
        if ($day <= 7) {
            return self::STAGE_RECORDING;
        }
        if ($day <= 21) {
            return self::STAGE_REDUCING;
        }

        return self::STAGE_CONSOLIDATING;
    }
}