package app

import (
	"douyu_go/internal/activity"
	"douyu_go/internal/client"
	"douyu_go/internal/config"
	"douyu_go/internal/constants"
	"douyu_go/internal/logger"
	"douyu_go/internal/types"
)

// GetActivities 返回所有已注册的手册活动，供前端下拉选择。
func (a *App) GetActivities() []types.ActivityInfo {
	list := activity.List()
	out := make([]types.ActivityInfo, 0, len(list))
	for _, act := range list {
		out = append(out, types.ActivityInfo{ID: act.ID, DisplayName: act.DisplayName})
	}
	return out
}

// GetCurrentActivity 返回当前生效的活动。
func (a *App) GetCurrentActivity() types.ActivityInfo {
	cli := a.getClient()
	act := cli.Activity
	return types.ActivityInfo{ID: act.ID, DisplayName: act.DisplayName}
}

// SwitchActivity 切换当前活动并持久化到配置；切换后重建客户端与时间基准。
func (a *App) SwitchActivity(id string) types.SwitchActivityResult {
	act := activity.Get(id)
	if act == nil {
		return types.SwitchActivityResult{Error: "未知活动: " + id}
	}
	cfg := a.getCfg()
	cfg.Activity = act.ID
	// 仅当用户未自定义时间校准接口时才回退默认值，避免切换活动静默覆盖用户在设置里填的 timeApiUrl。
	if cfg.TimeAPIURL == "" {
		cfg.TimeAPIURL = constants.DefaultTimeAPI
	}
	if err := config.SaveConfig(a.paths.ConfigFile, cfg); err != nil {
		logger.LogEvent("活动", "error", "切换活动配置保存失败: %v", err)
		return types.SwitchActivityResult{Error: "配置保存失败: " + err.Error()}
	}
	a.setCfg(cfg)
	newClient := client.New(act, cfg.TimeAPIURL, a.getTrace())
	a.setClient(newClient)
	if !a.scheduler.UpdateClient(newClient) {
		logger.LogEvent("活动", "warn", "抢购任务正在运行，调度器客户端将在下次抢购时生效")
	}
	if sample, err := newClient.ServerTimeSample(); err == nil {
		logger.SetDouyuOffset(sample.Offset)
	}
	logger.LogEvent("活动", "success", "已切换到活动: %s", act.DisplayName)
	return types.SwitchActivityResult{Success: true, Activity: act.ID, DisplayName: act.DisplayName}
}

// GetSettings 返回当前配置。
func (a *App) GetSettings() types.Config {
	return a.getCfg()
}

// SaveSettings 保存配置并运行时生效。
func (a *App) SaveSettings(cfg types.Config) types.SimpleResult {
	oldCfg := a.getCfg()
	if cfg.Activity == "" {
		cfg.Activity = oldCfg.Activity
	}
	act := activity.Get(cfg.Activity)
	if act == nil {
		unknownActivity := cfg.Activity
		act = activity.Default()
		cfg.Activity = act.ID
		logger.LogEvent("配置", "warn", "保存设置时活动 %q 未识别，已回退到默认活动 %s", unknownActivity, act.DisplayName)
	}
	if cfg.TimeAPIURL == "" {
		cfg.TimeAPIURL = constants.DefaultTimeAPI
	}
	if cfg.TraceMaxBody < 0 {
		cfg.TraceMaxBody = 0
	}
	if cfg.XiaodianPageSize <= 0 || cfg.XiaodianPageSize > 200 {
		cfg.XiaodianPageSize = 200
	}

	// 校验
	if cfg.Concurrency <= 0 {
		cfg.Concurrency = constants.DefaultConcurrency
	}
	if cfg.Attempts <= 0 {
		cfg.Attempts = constants.DefaultAttempts
	}
	if cfg.LogLevel == "" {
		cfg.LogLevel = "info"
	}

	// 写入文件
	if err := config.SaveConfig(a.paths.ConfigFile, cfg); err != nil {
		logger.LogEvent("配置", "error", "配置保存失败: %v", err)
		return types.SimpleResult{}
	}

	traceChanged := cfg.TraceEnabled != oldCfg.TraceEnabled || cfg.TraceMaxBody != oldCfg.TraceMaxBody
	clientChanged := traceChanged || cfg.TimeAPIURL != oldCfg.TimeAPIURL || cfg.Activity != oldCfg.Activity
	if traceChanged {
		a.replaceTrace(cfg)
	}

	// 运行时生效
	a.setCfg(cfg)
	logger.SetMinLevel(cfg.LogLevel)
	a.scheduler.UpdateSettings(cfg.Concurrency, cfg.Attempts, cfg.RetryStages, cfg.SeckillMode)
	if clientChanged {
		newClient := client.New(act, cfg.TimeAPIURL, a.getTrace())
		a.setClient(newClient)
		if !a.scheduler.UpdateClient(newClient) {
			logger.LogEvent("配置", "warn", "抢购任务正在运行，客户端配置将在下次抢购时完整生效")
		}
		if sample, err := newClient.ServerTimeSample(); err == nil {
			logger.SetDouyuOffset(sample.Offset)
		} else {
			logger.LogEvent("时间", "warn", "保存配置后服务端时间校准失败: %v", err)
		}
	}

	logger.LogEvent("配置", "success", "配置已保存并生效: 日志等级=%s 并发=%d 重试=%d 重试阶段=%d 模式=%d trace=%v",
		cfg.LogLevel, cfg.Concurrency, cfg.Attempts, len(cfg.RetryStages), cfg.SeckillMode, cfg.TraceEnabled)
	return types.SimpleResult{Success: true}
}