package handlers

import (
	_ "embed"
	"fanqie/internal/algos"
	"fanqie/internal/config"
	"fanqie/internal/fqapi"
	"fmt"
	"html/template"
	"net/http"
	"time"
)

// 状态页模板（embed 内嵌，动态数据由 html/template 自动转义）
//
//go:embed templates/status.html
var statusHTML string

var statusTmpl = template.Must(template.New("status").Parse(statusHTML))

// HandleStatus 状态页面处理
func HandleStatus(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	uptime := time.Since(startTime)

	// 格式化运行时间
	days := int(uptime.Hours() / 24)
	hours := int(uptime.Hours()) % 24
	minutes := int(uptime.Minutes()) % 60
	seconds := int(uptime.Seconds()) % 60
	var uptimeStr string
	if days > 0 {
		uptimeStr = fmt.Sprintf("%d天 %d小时 %d分钟 %d秒", days, hours, minutes, seconds)
	} else if hours > 0 {
		uptimeStr = fmt.Sprintf("%d小时 %d分钟 %d秒", hours, minutes, seconds)
	} else if minutes > 0 {
		uptimeStr = fmt.Sprintf("%d分钟 %d秒", minutes, seconds)
	} else {
		uptimeStr = fmt.Sprintf("%d秒", seconds)
	}

	// 获取签名信息
	currentSign := algos.GlobalSignatureSwitcher.GetCurrentMethod()

	// 生成签名详情显示
	var signatureDetails string
	if currentSign == "sign2" {
		signatureDetails = "X-Gorgon + X-Khronos"
	} else {
		signatureDetails = "X-Gorgon + X-Ladon + X-Argus + X-Khronos"
	}

	// 获取统计数据
	stats := getStatsSnapshot()

	// 获取设备密钥池状态
	poolStatus := getDeviceKeyPoolStatus()

	// 获取最近请求（日志未启用时为空）
	var recent []map[string]interface{}
	for _, e := range fqapi.GetRecentRequests(20) {
		recent = append(recent, map[string]interface{}{
			"Time":     time.Unix(e.Ts, 0).Format("15:04:05"),
			"IP":       e.IP,
			"Method":   e.Method,
			"Path":     e.Path,
			"Query":    truncateStr(e.Query, 80),
			"Status":   e.Status,
			"IsErr":    e.Status >= 400,
			"Duration": fmt.Sprintf("%dms", e.DurationMs),
		})
	}

	statusTmpl.Execute(w, map[string]interface{}{
		"NowTime":         time.Now().Format("2006-01-02 15:04:05"),
		"Uptime":          uptimeStr,
		"StartTime":       startTime.Format("2006-01-02 15:04:05"),
		"Signature":       signatureDetails,
		"DBTotal":         getDBTotalSize(),
		"DBUsedPct":       getDBUsagePercentage(),
		"DBUsed":          getDBUsedSize(),
		"DBFree":          getDBFreeSize(),
		"PoolStatus":      poolStatus["status"],
		"PoolTotal":       poolStatus["total"],
		"PoolValid":       poolStatus["valid"],
		"PoolInvalid":     poolStatus["invalid"],
		"PoolIndex":       poolStatus["current_index"],
		"StatTotal":       stats["total"],
		"StatSearch":      stats["search"],
		"StatDetail":      stats["detail"],
		"StatCatalog":     stats["catalog"],
		"StatContent":     stats["content"],
		"StatManga":       stats["manga"],
		"StatAudio":       stats["audio"],
		"StatVideo":       stats["video"],
		"StatCategory":    stats["category"],
		"CacheCount":      getDBCacheCount(),
		"CacheStatus":     getCacheStatus(),
		"CleanupStatus":   getCleanupStatus(),
		"CleanupInterval": getCleanupInterval(),
		"RecentRequests":  recent,
	})
}

// truncateStr 截断字符串，超长加省略号
func truncateStr(s string, n int) string {
	if len(s) <= n {
		return s
	}
	return s[:n] + "…"
}

// getCacheStatus 获取缓存状态
func getCacheStatus() string {
	cfg := config.GetConfig()
	if cfg != nil && cfg.Cache.Enabled {
		return "已启用"
	}
	return "已禁用"
}

// getCleanupStatus 获取清理状态
func getCleanupStatus() string {
	cfg := config.GetConfig()
	if cfg != nil && cfg.Cache.CleanupEnabled {
		return "已启用"
	}
	return "已禁用"
}

// getCleanupInterval 获取清理间隔
func getCleanupInterval() string {
	cfg := config.GetConfig()
	if cfg != nil {
		seconds := cfg.Cache.CleanupSeconds
		if seconds == 0 {
			return "不清理"
		} else if seconds < 60 {
			return fmt.Sprintf("%d秒", seconds)
		} else if seconds < 3600 {
			return fmt.Sprintf("%d分钟", seconds/60)
		} else {
			return fmt.Sprintf("%d小时", seconds/3600)
		}
	}
	return "未知"
}

// formatBytes 格式化字节大小
func formatBytes(bytes int64) string {
	const unit = 1024
	if bytes < unit {
		return fmt.Sprintf("%d B", bytes)
	}
	div, exp := int64(unit), 0
	for n := bytes / unit; n >= unit; n /= unit {
		div *= unit
		exp++
	}
	return fmt.Sprintf("%.2f %cB", float64(bytes)/float64(div), "KMGTPE"[exp])
}

// getDBCacheCount 获取数据库缓存记录数
func getDBCacheCount() int {
	stats, err := fqapi.GetDatabaseStats()
	if err != nil || stats == nil {
		return 0
	}
	if count, ok := stats["cache_count"].(int); ok {
		return count
	}
	return 0
}

// getDBTotalSize 获取数据库总大小
func getDBTotalSize() string {
	stats, err := fqapi.GetDatabaseStats()
	if err != nil || stats == nil {
		return "未知"
	}
	if size, ok := stats["total_size_bytes"].(int64); ok {
		return formatBytes(size)
	}
	return "未知"
}

// getDBUsedSize 获取数据库已用空间
func getDBUsedSize() string {
	stats, err := fqapi.GetDatabaseStats()
	if err != nil || stats == nil {
		return "未知"
	}
	if size, ok := stats["used_size_bytes"].(int64); ok {
		return formatBytes(size)
	}
	return "未知"
}

// getDBFreeSize 获取数据库空闲空间（带颜色提示）
func getDBFreeSize() string {
	stats, err := fqapi.GetDatabaseStats()
	if err != nil || stats == nil {
		return "未知"
	}
	freeSize, okFree := stats["free_size_bytes"].(int64)
	totalSize, okTotal := stats["total_size_bytes"].(int64)

	if !okFree {
		return "未知"
	}

	if freeSize == 0 {
		return "0 B"
	}

	freeSizeStr := formatBytes(freeSize)

	// 如果有总大小，计算并显示百分比
	if okTotal && totalSize > 0 {
		percentage := float64(freeSize) * 100 / float64(totalSize)
		return fmt.Sprintf("%s (%.1f%%)", freeSizeStr, percentage)
	}

	return freeSizeStr
}

// getDBUsagePercentage 获取数据库使用率
func getDBUsagePercentage() float64 {
	stats, err := fqapi.GetDatabaseStats()
	if err != nil || stats == nil {
		return 0
	}
	usedSize, okUsed := stats["used_size_bytes"].(int64)
	totalSize, okTotal := stats["total_size_bytes"].(int64)

	if !okUsed || !okTotal || totalSize == 0 {
		return 0
	}

	return float64(usedSize) * 100 / float64(totalSize)
}

// getDeviceKeyPoolStatus 获取设备密钥池状态
func getDeviceKeyPoolStatus() map[string]interface{} {
	pool := fqapi.GetDeviceKeyPool()

	if !pool.IsEnabled() {
		return map[string]interface{}{
			"status":        "未启用",
			"total":         0,
			"valid":         0,
			"invalid":       0,
			"current_index": 0,
		}
	}

	stats := pool.GetStats()
	return map[string]interface{}{
		"status":        "已启用",
		"total":         stats["total"],
		"valid":         stats["valid"],
		"invalid":       stats["invalid"],
		"current_index": stats["current_index"],
	}
}