package plane_v2

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

	"go.uber.org/zap"
)

// ==================== Asset v2 API ====================

// Entity Type 常量
const (
	EntityIssueDescription      = "ISSUE_DESCRIPTION"
	EntityIssueAttachment       = "ISSUE_ATTACHMENT"
	EntityCommentDescription    = "COMMENT_DESCRIPTION"
	EntityPageDescription       = "PAGE_DESCRIPTION"
	EntityDraftIssueDescription = "DRAFT_ISSUE_DESCRIPTION"
	EntityProjectCover          = "PROJECT_COVER"
	EntityUserAvatar            = "USER_AVATAR"
	EntityUserCover             = "USER_COVER"
	EntityWorkspaceLogo         = "WORKSPACE_LOGO"
)

// WebAssetUploadResult 资源上传结果
type WebAssetUploadResult struct {
	UploadData struct {
		URL    string            `json:"url"`
		Fields map[string]string `json:"fields"`
	} `json:"upload_data"`
	AssetID  string `json:"asset_id"`
	AssetURL string `json:"asset_url"`
}

// CreateProjectAsset 创建项目资源（获取预签名 URL）
func CreateProjectAsset(slug, projectID, fileName, mimeType string, size int64, entityType string) (*WebAssetUploadResult, error) {
	url := fmt.Sprintf("/api/assets/v2/workspaces/%s/projects/%s/", slug, projectID)
	payload := map[string]interface{}{
		"name":              fileName,
		"type":              mimeType,
		"size":              size,
		"entity_type":       entityType,
		"entity_identifier": "",
	}

	resp, err := planeWebPost(url, payload)
	if err != nil {
		zap.L().Error("[PlaneWeb] CreateProjectAsset 请求失败", zap.Error(err))
		return nil, err
	}

	if !isWebSuccess(resp.StatusCode) {
		zap.L().Error("[PlaneWeb] CreateProjectAsset 返回错误",
			zap.String("status", resp.Status),
			zap.String("body", string(resp.Body)),
		)
		return nil, fmt.Errorf("CreateProjectAsset 失败: %s", resp.Status)
	}

	var result WebAssetUploadResult
	if err := json.Unmarshal(resp.Body, &result); err != nil {
		return nil, fmt.Errorf("解析资源上传响应失败: %w", err)
	}

	return &result, nil
}

// UploadToS3 上传文件到 S3（使用预签名 POST URL）
func UploadToS3(uploadURL string, fields map[string]string, fileData []byte, fileName string) error {
	// 替换容器内地址为宿主机地址
	uploadURL = strings.ReplaceAll(uploadURL, "host.docker.internal", "localhost")

	var buf bytes.Buffer
	writer := multipart.NewWriter(&buf)

	// 先写入所有 fields（必须在 file 之前）
	for k, v := range fields {
		if err := writer.WriteField(k, v); err != nil {
			return fmt.Errorf("写入 field %s 失败: %w", k, err)
		}
	}

	// 写入文件
	part, err := writer.CreateFormFile("file", fileName)
	if err != nil {
		return fmt.Errorf("创建 form file 失败: %w", err)
	}
	if _, err := part.Write(fileData); err != nil {
		return fmt.Errorf("写入文件数据失败: %w", err)
	}
	writer.Close()

	req, err := http.NewRequest(http.MethodPost, uploadURL, &buf)
	if err != nil {
		return fmt.Errorf("创建上传请求失败: %w", err)
	}
	req.Header.Set("Content-Type", writer.FormDataContentType())

	client := &http.Client{Timeout: 60 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		zap.L().Error("[PlaneWeb] S3 Upload 请求失败", zap.Error(err))
		return fmt.Errorf("文件上传失败: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		respBody, _ := io.ReadAll(resp.Body)
		zap.L().Error("[PlaneWeb] S3 Upload 返回错误",
			zap.String("status", resp.Status),
			zap.String("body", string(respBody)),
		)
		return fmt.Errorf("文件上传失败: %s", resp.Status)
	}

	zap.L().Debug("[PlaneWeb] S3 Upload 成功")
	return nil
}

// ConfirmProjectAssetUpload 确认项目资源上传完成
func ConfirmProjectAssetUpload(slug, projectID, assetID string) error {
	url := fmt.Sprintf("/api/assets/v2/workspaces/%s/projects/%s/%s/", slug, projectID, assetID)

	// Plane 期望空对象 {} 作为请求体（不能传 nil，否则序列化为 null 导致 500）
	resp, err := planeWebPatch(url, map[string]interface{}{})
	if err != nil {
		zap.L().Error("[PlaneWeb] ConfirmProjectAssetUpload 请求失败", zap.Error(err))
		return err
	}

	if resp.StatusCode != 204 && !isWebSuccess(resp.StatusCode) {
		zap.L().Error("[PlaneWeb] ConfirmProjectAssetUpload 返回错误", zap.String("status", resp.Status))
		return fmt.Errorf("ConfirmProjectAssetUpload 失败: %s", resp.Status)
	}

	return nil
}

// GetProjectAsset 下载项目资源（返回302重定向URL）
func GetProjectAsset(slug, projectID, assetID string) ([]byte, error) {
	url := fmt.Sprintf("/api/assets/v2/workspaces/%s/projects/%s/%s/", slug, projectID, assetID)

	resp, err := planeWebGet(url)
	if err != nil {
		zap.L().Error("[PlaneWeb] GetProjectAsset 请求失败", zap.Error(err))
		return nil, err
	}

	return resp.Body, nil
}

// GetProjectAssetURL 获取项目资源的预签名访问URL（从302 Location中提取）
func GetProjectAssetURL(slug, projectID, assetID string) (string, error) {
	reqURL := webBaseURL + fmt.Sprintf("/api/assets/v2/workspaces/%s/projects/%s/%s/", slug, projectID, assetID)

	req, err := http.NewRequest(http.MethodGet, reqURL, nil)
	if err != nil {
		return "", fmt.Errorf("创建请求失败: %w", err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Referer", webBaseURL)

	resp, err := webClient.Do(req)
	if err != nil {
		return "", fmt.Errorf("请求失败: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusFound || resp.StatusCode == http.StatusMovedPermanently {
		location := resp.Header.Get("Location")
		if location != "" {
			return location, nil
		}
	}

	if isWebSuccess(resp.StatusCode) {
		return reqURL, nil
	}

	return "", fmt.Errorf("获取资源URL失败: status=%d", resp.StatusCode)
}

// DeleteProjectAsset 删除项目资源
func DeleteProjectAsset(slug, projectID, assetID string) error {
	url := fmt.Sprintf("/api/assets/v2/workspaces/%s/projects/%s/%s/", slug, projectID, assetID)

	resp, err := planeWebDelete(url)
	if err != nil {
		zap.L().Error("[PlaneWeb] DeleteProjectAsset 请求失败", zap.Error(err))
		return err
	}

	if resp.StatusCode != 204 {
		zap.L().Error("[PlaneWeb] DeleteProjectAsset 返回错误", zap.String("status", resp.Status))
		return fmt.Errorf("DeleteProjectAsset 失败: %s", resp.Status)
	}

	return nil
}

// BindAssetsToEntity 批量绑定资源到实体
func BindAssetsToEntity(slug, projectID, entityID string, assetIDs []string) error {
	url := fmt.Sprintf("/api/assets/v2/workspaces/%s/projects/%s/%s/bulk/", slug, projectID, entityID)
	payload := map[string]interface{}{
		"asset_ids": assetIDs,
	}

	resp, err := planeWebPost(url, payload)
	if err != nil {
		zap.L().Error("[PlaneWeb] BindAssetsToEntity 请求失败", zap.Error(err))
		return err
	}

	if resp.StatusCode != 204 && !isWebSuccess(resp.StatusCode) {
		zap.L().Error("[PlaneWeb] BindAssetsToEntity 返回错误", zap.String("status", resp.Status))
		return fmt.Errorf("BindAssetsToEntity 失败: %s", resp.Status)
	}

	return nil
}

// CreateWorkspaceAsset 创建工作空间资源
func CreateWorkspaceAsset(slug, fileName, mimeType string, size int64, entityType string) (*WebAssetUploadResult, error) {
	url := fmt.Sprintf("/api/assets/v2/workspaces/%s/", slug)
	payload := map[string]interface{}{
		"name":              fileName,
		"type":              mimeType,
		"size":              size,
		"entity_type":       entityType,
		"entity_identifier": "",
	}

	resp, err := planeWebPost(url, payload)
	if err != nil {
		zap.L().Error("[PlaneWeb] CreateWorkspaceAsset 请求失败", zap.Error(err))
		return nil, err
	}

	if !isWebSuccess(resp.StatusCode) {
		zap.L().Error("[PlaneWeb] CreateWorkspaceAsset 返回错误",
			zap.String("status", resp.Status),
			zap.String("body", string(resp.Body)),
		)
		return nil, fmt.Errorf("CreateWorkspaceAsset 失败: %s", resp.Status)
	}

	var result WebAssetUploadResult
	if err := json.Unmarshal(resp.Body, &result); err != nil {
		return nil, fmt.Errorf("解析资源上传响应失败: %w", err)
	}

	return &result, nil
}

// ConfirmWorkspaceAssetUpload 确认工作空间资源上传完成
func ConfirmWorkspaceAssetUpload(slug, assetID string) error {
	url := fmt.Sprintf("/api/assets/v2/workspaces/%s/%s/", slug, assetID)

	resp, err := planeWebPatch(url, map[string]interface{}{})
	if err != nil {
		zap.L().Error("[PlaneWeb] ConfirmWorkspaceAssetUpload 请求失败", zap.Error(err))
		return err
	}

	if resp.StatusCode != 204 && !isWebSuccess(resp.StatusCode) {
		zap.L().Error("[PlaneWeb] ConfirmWorkspaceAssetUpload 返回错误", zap.String("status", resp.Status))
		return fmt.Errorf("ConfirmWorkspaceAssetUpload 失败: %s", resp.Status)
	}

	return nil
}

// CreateUserAsset 创建用户资源
func CreateUserAsset(fileName, mimeType string, size int64, entityType string) (*WebAssetUploadResult, error) {
	payload := map[string]interface{}{
		"name":              fileName,
		"type":              mimeType,
		"size":              size,
		"entity_type":       entityType,
		"entity_identifier": "",
	}

	resp, err := planeWebPost("/api/assets/v2/user-assets/", payload)
	if err != nil {
		zap.L().Error("[PlaneWeb] CreateUserAsset 请求失败", zap.Error(err))
		return nil, err
	}

	if !isWebSuccess(resp.StatusCode) {
		zap.L().Error("[PlaneWeb] CreateUserAsset 返回错误",
			zap.String("status", resp.Status),
			zap.String("body", string(resp.Body)),
		)
		return nil, fmt.Errorf("CreateUserAsset 失败: %s", resp.Status)
	}

	var result WebAssetUploadResult
	if err := json.Unmarshal(resp.Body, &result); err != nil {
		return nil, fmt.Errorf("解析资源上传响应失败: %w", err)
	}

	return &result, nil
}

// ConfirmUserAssetUpload 确认用户资源上传完成
func ConfirmUserAssetUpload(assetID string) error {
	url := fmt.Sprintf("/api/assets/v2/user-assets/%s/", assetID)

	resp, err := planeWebPatch(url, map[string]interface{}{})
	if err != nil {
		zap.L().Error("[PlaneWeb] ConfirmUserAssetUpload 请求失败", zap.Error(err))
		return err
	}

	if resp.StatusCode != 204 && !isWebSuccess(resp.StatusCode) {
		zap.L().Error("[PlaneWeb] ConfirmUserAssetUpload 返回错误", zap.String("status", resp.Status))
		return fmt.Errorf("ConfirmUserAssetUpload 失败: %s", resp.Status)
	}

	return nil
}

// UploadProjectAsset 完整上传项目资源流程（组合方法）
// 1. 创建资源获取预签名URL → 2. 上传到S3 → 3. 确认上传完成
func UploadProjectAsset(slug, projectID, fileName, mimeType string, fileData []byte, entityType string) (*WebAssetUploadResult, error) {
	fileSize := int64(len(fileData))

	// Step 1: 创建资源
	result, err := CreateProjectAsset(slug, projectID, fileName, mimeType, fileSize, entityType)
	if err != nil {
		return nil, fmt.Errorf("创建资源失败: %w", err)
	}

	zap.L().Debug("[PlaneWeb] Asset Create 成功",
		zap.String("assetId", result.AssetID),
		zap.String("uploadURL", result.UploadData.URL),
	)

	// Step 2: 上传到 S3
	if err := UploadToS3(result.UploadData.URL, result.UploadData.Fields, fileData, fileName); err != nil {
		return nil, fmt.Errorf("上传文件到S3失败: %w", err)
	}

	// Step 3: 确认上传完成
	if err := ConfirmProjectAssetUpload(slug, projectID, result.AssetID); err != nil {
		return nil, fmt.Errorf("确认上传失败: %w", err)
	}

	zap.L().Info("[PlaneWeb] Asset 上传完成",
		zap.String("assetId", result.AssetID),
		zap.String("fileName", fileName),
		zap.String("assetUrl", result.AssetURL),
	)

	return result, nil
}

// UploadCurrentProjectAsset 在当前项目上传资源
func UploadCurrentProjectAsset(fileName, mimeType string, fileData []byte, entityType string) (*WebAssetUploadResult, error) {
	return UploadProjectAsset(webWorkspaceSlug, webProjectId, fileName, mimeType, fileData, entityType)
}