package platforms

import (
	"code-review/services/types"
	"code-review/utils"
	"fmt"
	"log"
	"strings"
)

type GiteaEvent struct {
	apiBase string
	auth    *AuthConfig
	Event   string
	client  *httpClient

	Secret     string `json:"secret"`
	Ref        string `json:"ref"`
	Before     string `json:"before"`
	After      string `json:"after"`
	CompareURL string `json:"compare_url"`
	Commits    []struct {
		ID      string `json:"sha"`
		Message string `json:"commit.message"`
		URL     string `json:"url"`
		HTMLURL string `json:"html_url"`
		Created string `json:"created"`
		Author  struct {
			Active         bool   `json:"active"`
			AvatarURL      string `json:"avatar_url"`
			Created        string `json:"created"`
			Description    string `json:"description"`
			Email          string `json:"email"`
			FollowersCount int    `json:"followers_count"`
			FollowingCount int    `json:"following_count"`
			FullName       string `json:"full_name"`
			HTMLURL        string `json:"html_url"`
			ID             int    `json:"id"`
			IsAdmin        bool   `json:"is_admin"`
			Language       string `json:"language"`
			LastLogin      string `json:"last_login"`
			Location       string `json:"location"`
			Login          string `json:"login"`
			LoginName      string `json:"login_name"`
			ProhibitLogin  bool   `json:"prohibit_login"`
			Restricted     bool   `json:"restricted"`
			SourceID       int    `json:"source_id"`
			Visibility     string `json:"visibility"`
			Website        string `json:"website"`
		} `json:"author"`
		Committer struct {
			Active         bool   `json:"active"`
			AvatarURL      string `json:"avatar_url"`
			Created        string `json:"created"`
			Description    string `json:"description"`
			Email          string `json:"email"`
			FollowersCount int    `json:"followers_count"`
			FollowingCount int    `json:"following_count"`
			FullName       string `json:"full_name"`
			HTMLURL        string `json:"html_url"`
			ID             int    `json:"id"`
			IsAdmin        bool   `json:"is_admin"`
			Language       string `json:"language"`
			LastLogin      string `json:"last_login"`
			Location       string `json:"location"`
			Login          string `json:"login"`
			LoginName      string `json:"login_name"`
			ProhibitLogin  bool   `json:"prohibit_login"`
			Restricted     bool   `json:"restricted"`
			SourceID       int    `json:"source_id"`
			Visibility     string `json:"visibility"`
			Website        string `json:"website"`
		} `json:"committer"`
		Commit struct {
			Author struct {
				Date  string `json:"date"`
				Email string `json:"email"`
				Name  string `json:"name"`
			} `json:"author"`
			Committer struct {
				Date  string `json:"date"`
				Email string `json:"email"`
				Name  string `json:"name"`
			} `json:"committer"`
			Message string `json:"message"`
			Tree    struct {
				Created string `json:"created"`
				SHA     string `json:"sha"`
				URL     string `json:"url"`
			} `json:"tree"`
			URL          string `json:"url"`
			Verification struct {
				Payload   string `json:"payload"`
				Reason    string `json:"reason"`
				Signature string `json:"signature"`
				Signer    struct {
					Email    string `json:"email"`
					Name     string `json:"name"`
					Username string `json:"username"`
				} `json:"signer"`
				Verified bool `json:"verified"`
			} `json:"verification"`
		} `json:"commit"`
		Files []struct {
			Filename string `json:"filename"`
			Status   string `json:"status"`
		} `json:"files"`
		Parents []struct {
			Created string `json:"created"`
			SHA     string `json:"sha"`
			URL     string `json:"url"`
		} `json:"parents"`
		Stats struct {
			Additions int `json:"additions"`
			Deletions int `json:"deletions"`
			Total     int `json:"total"`
		} `json:"stats"`
	} `json:"commits"`
	Repository struct {
		ID              int    `json:"id"`
		Name            string `json:"name"`
		FullName        string `json:"full_name"`
		Description     string `json:"description"`
		Private         bool   `json:"private"`
		Fork            bool   `json:"fork"`
		HTMLURL         string `json:"html_url"`
		SSHURL          string `json:"ssh_url"`
		CloneURL        string `json:"clone_url"`
		Website         string `json:"website"`
		StarsCount      int    `json:"stars_count"`
		ForksCount      int    `json:"forks_count"`
		WatchersCount   int    `json:"watchers_count"`
		OpenIssuesCount int    `json:"open_issues_count"`
		DefaultBranch   string `json:"default_branch"`
		CreatedAt       string `json:"created_at"`
		UpdatedAt       string `json:"updated_at"`
		Owner           struct {
			ID        int    `json:"id"`
			Login     string `json:"login"`
			FullName  string `json:"full_name"`
			Email     string `json:"email"`
			AvatarURL string `json:"avatar_url"`
			Username  string `json:"username"`
		} `json:"owner"`
	} `json:"repository"`
	Pusher struct {
		ID        int    `json:"id"`
		Login     string `json:"login"`
		FullName  string `json:"full_name"`
		Email     string `json:"email"`
		AvatarURL string `json:"avatar_url"`
		Username  string `json:"username"`
	} `json:"pusher"`
	Sender struct {
		ID        int    `json:"id"`
		Login     string `json:"login"`
		FullName  string `json:"full_name"`
		Email     string `json:"email"`
		AvatarURL string `json:"avatar_url"`
		Username  string `json:"username"`
	} `json:"sender"`
}

// NewGiteaEvent 创建 Gitea 事件
func NewGiteaEvent(apiBase string, auth *AuthConfig, event string) *GiteaEvent {
	return &GiteaEvent{
		apiBase: apiBase,
		auth:    auth,
		Event:   event,
	}
}

// 定义 Gitea commit 响应的结构
type giteaCommitResponse struct {
	Diff string `json:"diff"`
}

func (e *GiteaEvent) ExtractChanges() (*types.CodeChanges, error) {
	// 检查是否有提交记录
	if len(e.Commits) == 0 {
		log.Printf("没有提交记录，跳过代码审查")
		return nil, nil
	}

	if e.client == nil {
		e.client = newHTTPClient(e.apiBase, e.auth)
		log.Printf("初始化 HTTP 客户端: url=%s", e.apiBase)
	}

	changes := &types.CodeChanges{
		Repository: e.Repository.FullName,
		Branch:     e.Ref,
		CommitID:   e.After,
		Files:      make([]types.FileChange, 0),
	}

	for _, commit := range e.Commits {
		// 检查提交信息是否包含跳过标记
		if strings.Contains(commit.Message, "[skip codereview]") {
			log.Printf("提交包含跳过标记，跳过所有文件审查: commit=%s", commit.ID)
			continue
		}

		// 检查是否是合并提交
		if strings.HasPrefix(commit.Message, "Merge remote-tracking branch") ||
			strings.HasPrefix(commit.Message, "Merge branch") {
			log.Printf("跳过合并提交的文件审查: commit=%s", commit.ID)
			continue
		}

		// 获取 diff 内容
		apiPath := fmt.Sprintf("/api/v1/repos/%s/%s/git/commits/%s.diff", e.Repository.Owner.Login, e.Repository.Name, e.After)
		diffContent, err := e.client.getRaw(apiPath)
		if err != nil {
			log.Printf("获取提交详情失败: commit=%s, error=%v", commit.ID, err)
			continue
		}

		// 解析 diff 内容
		diffLines := strings.Split(diffContent, "\n")
		var currentFile *types.FileChange
		var currentContent strings.Builder

		for _, line := range diffLines {
			if strings.HasPrefix(line, "diff --git") {
				// 保存前一个文件的内容
				if currentFile != nil {
					currentFile.Content = currentContent.String() + "```\n"
					changes.Files = append(changes.Files, *currentFile)
				}

				// 解析文件名
				parts := strings.Split(line, " ")
				if len(parts) >= 3 {
					filePath := strings.TrimPrefix(parts[2], "b/")
					if shouldSkipFile(filePath) {
						log.Printf("跳过文件审查: file=%s", filePath)
						currentFile = nil
						continue
					}

					currentFile = &types.FileChange{
						Path: filePath,
						Type: utils.ParseFileType("modified"),
					}
					currentContent.Reset()
					currentContent.WriteString(fmt.Sprintf("### 变更说明\n"))
					currentContent.WriteString(fmt.Sprintf("提交信息: %s\n\n", commit.Message))
					currentContent.WriteString("### 变更内容\n")
					currentContent.WriteString("```diff\n")
				}
			} else if currentFile != nil {
				currentContent.WriteString(line + "\n")
			}
		}

		// 保存最后一个文件的内容
		if currentFile != nil {
			currentFile.Content = currentContent.String() + "```\n"
			changes.Files = append(changes.Files, *currentFile)
		}
	}

	return changes, nil
}

func (e *GiteaEvent) PostComments(result *types.ReviewResult) error {
	if e.client == nil {
		e.client = newHTTPClient(e.apiBase, e.auth)
	}

	// 创建 issue
	path := fmt.Sprintf("/api/v1/repos/%s/%s/issues", e.Repository.Owner.Login, e.Repository.Name)
	issueData := map[string]interface{}{
		"title": fmt.Sprintf("AI 代码审查 - %s", e.After[:7]),
		"body":  utils.FormatReviewResult(result),
	}

	if err := e.client.post(path, issueData); err != nil {
		log.Printf("创建 issue 失败: path=%s, error=%v", path, err)
		return fmt.Errorf("创建 issue 失败: %w", err)
	}

	log.Printf("成功创建 issue: path=%s, commitID=%s", path, e.After[:7])
	return nil
}

func (e *GiteaEvent) GetPlatform() string {
	return "gitea"
}

// 判断是否应该跳过文件审查
func shouldSkipFile(filename string) bool {
	// 跳过特定文件类型
	skipExtensions := []string{".md", ".txt", ".json", ".yaml", ".yml", ".lock"}
	for _, ext := range skipExtensions {
		if strings.HasSuffix(filename, ext) {
			return true
		}
	}

	// 跳过特定目录
	skipDirs := []string{"node_modules/", "dist/", "build/", "vendor/"}
	for _, dir := range skipDirs {
		if strings.Contains(filename, dir) {
			return true
		}
	}

	return false
}