package config

import (
	"os"
	"strings"
	"time"
)

// ModerationConfig 举报反馈服务配置 (spec §11.1)
type ModerationConfig struct {
	AutoHideThreshold   int
	CounterTTL          time.Duration
	UserMarkerTTL       time.Duration
	LockTTL             time.Duration
	MaxDescriptionLen   int
	MaxEvidenceCount    int
	MaxContactLen       int
	MaxReplyLen         int
	MaxEvidenceSize     int64
	AllowedMimeTypes    []string
	RateLimitUserPerDay int
	RateLimitIPPerDay   int
	RateLimitDevPerDay  int
	RateLimitFbUserDay  int
	ClaimTimeout        time.Duration
	PIIAnonymizeAfter   time.Duration
	AutoArchiveAfter    time.Duration
	RedisKeyPrefix      string
	PathDCounterPolicy  string
	// OSSBaseURL OSS bucket 公开访问的 host（不含末尾斜杠），用于把证据 oss_key 拼成完整 URL 写入 oss_url 列。
	// 由环境变量 OSS_BASE_URL 覆盖（main.go）。
	OSSBaseURL string
}

var Default = ModerationConfig{
	AutoHideThreshold:   5,
	CounterTTL:          7 * 24 * time.Hour,
	UserMarkerTTL:       24 * time.Hour,
	LockTTL:             5 * time.Second,
	MaxDescriptionLen:   500,
	MaxEvidenceCount:    5,
	MaxContactLen:       320,
	MaxReplyLen:         2000,
	MaxEvidenceSize:     5 * 1024 * 1024,
	AllowedMimeTypes:    []string{"image/png", "image/jpeg"},
	RateLimitUserPerDay: 30,
	RateLimitIPPerDay:   200,
	RateLimitDevPerDay:  200,
	RateLimitFbUserDay:  5,
	ClaimTimeout:        15 * time.Minute,
	PIIAnonymizeAfter:   90 * 24 * time.Hour,
	AutoArchiveAfter:    90 * 24 * time.Hour,
	RedisKeyPrefix:      "mod:report",
	PathDCounterPolicy:  "preserve",
	OSSBaseURL:          "https://top-fans-test.oss-cn-shanghai.aliyuncs.com",
}

// BuildOSSURL 把 oss_key 还原成可访问的完整 URL。
// 入参已是 http(s):// 开头则原样返回（兼容历史上传时就传完整 URL 的客户端）；
// 否则按 OSSBaseURL/<key> 拼接。返回空串表示入参为空。
func BuildOSSURL(ossBaseURL, key string) string {
	if key == "" {
		return ""
	}
	if strings.HasPrefix(key, "http://") || strings.HasPrefix(key, "https://") {
		return key
	}
	base := strings.TrimRight(ossBaseURL, "/")
	if base == "" {
		return key
	}
	return base + "/" + strings.TrimLeft(key, "/")
}

// LoadEnvOverrides 用环境变量覆盖 Default 里的可调字段。
func LoadEnvOverrides() ModerationConfig {
	c := Default
	if v := os.Getenv("OSS_BASE_URL"); v != "" {
		c.OSSBaseURL = v
	}
	return c
}