package handler

import (
	"encoding/json"
	"fmt"
	"io"
	"mime/multipart"
	"strings"
	"time"

	"github.com/aliyun/aliyun-oss-go-sdk/oss"

	"soul-api/internal/database"
	"soul-api/internal/model"
)

type ossConfigCache struct {
	Endpoint        string `json:"endpoint"`
	AccessKeyID     string `json:"accessKeyId"`
	AccessKeySecret string `json:"accessKeySecret"`
	Bucket          string `json:"bucket"`
	Region          string `json:"region"`
}

func getOssConfig() *ossConfigCache {
	db := database.DB()
	var row model.SystemConfig
	if err := db.Where("config_key = ?", "oss_config").First(&row).Error; err != nil {
		return nil
	}
	var cfg ossConfigCache
	if err := json.Unmarshal(row.ConfigValue, &cfg); err != nil {
		return nil
	}
	if cfg.Endpoint == "" || cfg.AccessKeyID == "" || cfg.AccessKeySecret == "" || cfg.Bucket == "" {
		return nil
	}
	return &cfg
}

func ossUploadFile(file multipart.File, folder, filename string) (string, error) {
	cfg := getOssConfig()
	if cfg == nil {
		return "", fmt.Errorf("OSS 未配置")
	}

	endpoint := cfg.Endpoint
	if !strings.HasPrefix(endpoint, "http://") && !strings.HasPrefix(endpoint, "https://") {
		endpoint = "https://" + endpoint
	}

	client, err := oss.New(endpoint, cfg.AccessKeyID, cfg.AccessKeySecret)
	if err != nil {
		return "", fmt.Errorf("创建 OSS 客户端失败: %w", err)
	}

	bucket, err := client.Bucket(cfg.Bucket)
	if err != nil {
		return "", fmt.Errorf("获取 Bucket 失败: %w", err)
	}

	objectKey := fmt.Sprintf("%s/%s/%s", folder, time.Now().Format("2006-01"), filename)

	data, err := io.ReadAll(file)
	if err != nil {
		return "", fmt.Errorf("读取文件失败: %w", err)
	}

	err = bucket.PutObject(objectKey, strings.NewReader(string(data)))
	if err != nil {
		return "", fmt.Errorf("上传 OSS 失败: %w", err)
	}

	signedURL, err := bucket.SignURL(objectKey, oss.HTTPGet, 3600*24*365*10)
	if err != nil {
		host := cfg.Bucket + "." + cfg.Endpoint
		if !strings.HasPrefix(cfg.Endpoint, "http://") && !strings.HasPrefix(cfg.Endpoint, "https://") {
			host = cfg.Bucket + "." + cfg.Endpoint
		} else {
			host = strings.Replace(cfg.Endpoint, "://", "://"+cfg.Bucket+".", 1)
		}
		if !strings.HasPrefix(host, "http://") && !strings.HasPrefix(host, "https://") {
			host = "https://" + host
		}
		return host + "/" + objectKey, nil
	}
	return normalizeOSSUrl(signedURL), nil
}

// normalizeOSSUrl 修复 OSS SDK 可能返回的缺少冒号的 URL（如 "https//..." → "https://..."）
func normalizeOSSUrl(u string) string {
	if strings.HasPrefix(u, "https//") {
		return "https://" + u[7:]
	}
	if strings.HasPrefix(u, "http//") {
		return "http://" + u[6:]
	}
	return u
}

func ossUploadBytes(data []byte, folder, filename, contentType string) (string, error) {
	cfg := getOssConfig()
	if cfg == nil {
		return "", fmt.Errorf("OSS 未配置")
	}

	endpoint := cfg.Endpoint
	if !strings.HasPrefix(endpoint, "http://") && !strings.HasPrefix(endpoint, "https://") {
		endpoint = "https://" + endpoint
	}

	client, err := oss.New(endpoint, cfg.AccessKeyID, cfg.AccessKeySecret)
	if err != nil {
		return "", fmt.Errorf("创建 OSS 客户端失败: %w", err)
	}

	bucket, err := client.Bucket(cfg.Bucket)
	if err != nil {
		return "", fmt.Errorf("获取 Bucket 失败: %w", err)
	}

	objectKey := fmt.Sprintf("%s/%s/%s", folder, time.Now().Format("2006-01"), filename)

	var opts []oss.Option
	if contentType != "" {
		opts = append(opts, oss.ContentType(contentType))
	}

	err = bucket.PutObject(objectKey, strings.NewReader(string(data)), opts...)
	if err != nil {
		return "", fmt.Errorf("上传 OSS 失败: %w", err)
	}

	signedURL, err := bucket.SignURL(objectKey, oss.HTTPGet, 3600*24*365*10)
	if err != nil {
		host := cfg.Bucket + "." + cfg.Endpoint
		if !strings.HasPrefix(cfg.Endpoint, "http://") && !strings.HasPrefix(cfg.Endpoint, "https://") {
			host = cfg.Bucket + "." + cfg.Endpoint
		} else {
			host = strings.Replace(cfg.Endpoint, "://", "://"+cfg.Bucket+".", 1)
		}
		if !strings.HasPrefix(host, "http://") && !strings.HasPrefix(host, "https://") {
			host = "https://" + host
		}
		return host + "/" + objectKey, nil
	}
	return normalizeOSSUrl(signedURL), nil
}