"""GitHub API service"""

import httpx
from typing import List, Dict, Any
from app.services.base import BaseGitService, FileChange, PRInfo


class GitHubService(BaseGitService):
    """Service for interacting with GitHub API"""
    
    def __init__(self, base_url: str, token: str, repo_owner: str, repo_name: str):
        # GitHub always uses api.github.com
        super().__init__("https://api.github.com", token, repo_owner, repo_name)
    
    def _get_headers(self) -> Dict[str, str]:
        """Get headers for API requests"""
        return {
            "Authorization": f"token {self.token}",
            "Accept": "application/vnd.github.v3+json",
            "Content-Type": "application/json"
        }
    
    def _get_repo_path(self) -> str:
        """Get repository API path"""
        return f"{self.base_url}/repos/{self.repo_owner}/{self.repo_name}"
    
    async def get_pull_request(self, pr_number: int) -> PRInfo:
        """Get pull request information from GitHub"""
        url = f"{self._get_repo_path()}/pulls/{pr_number}"
        
        async with httpx.AsyncClient() as client:
            response = await client.get(url, headers=self._get_headers())
            response.raise_for_status()
            data = response.json()
            
            return PRInfo(
                number=data["number"],
                title=data["title"],
                description=data.get("body", ""),
                author=data["user"]["login"],
                source_branch=data["head"]["ref"],
                target_branch=data["base"]["ref"],
                url=data["html_url"],
                state=data["state"]
            )
    
    async def get_pr_files(self, pr_number: int) -> List[FileChange]:
        """Get list of changed files in PR"""
        url = f"{self._get_repo_path()}/pulls/{pr_number}/files"
        
        async with httpx.AsyncClient() as client:
            response = await client.get(url, headers=self._get_headers())
            response.raise_for_status()
            files_data = response.json()
            
            changes = []
            for file in files_data:
                changes.append(FileChange(
                    filename=file["filename"],
                    status=file["status"],
                    additions=file.get("additions", 0),
                    deletions=file.get("deletions", 0),
                    patch=file.get("patch")
                ))
            
            return changes
    
    async def get_file_content(self, file_path: str, ref: str) -> str:
        """Get file content at specific ref"""
        url = f"{self._get_repo_path()}/contents/{file_path}"
        
        async with httpx.AsyncClient() as client:
            response = await client.get(
                url,
                headers=self._get_headers(),
                params={"ref": ref}
            )
            response.raise_for_status()
            data = response.json()
            
            # GitHub returns base64 encoded content
            import base64
            content = base64.b64decode(data["content"]).decode("utf-8")
            return content
    
    async def create_review_comment(
        self,
        pr_number: int,
        file_path: str,
        line_number: int,
        comment: str,
        commit_id: str
    ) -> Dict[str, Any]:
        """Create a review comment on PR"""
        url = f"{self._get_repo_path()}/pulls/{pr_number}/comments"
        
        payload = {
            "body": comment,
            "commit_id": commit_id,
            "path": file_path,
            "line": line_number,
            "side": "RIGHT"
        }
        
        async with httpx.AsyncClient() as client:
            response = await client.post(
                url,
                headers=self._get_headers(),
                json=payload
            )
            response.raise_for_status()
            return response.json()
    
    async def create_review(
        self,
        pr_number: int,
        comments: List[Dict[str, Any]],
        body: str = "",
        event: str = "COMMENT"
    ) -> Dict[str, Any]:
        """Create a review with separate comment for each issue
        
        Args:
            pr_number: PR number
            comments: List of comments
            body: Overall review summary (markdown supported)
            event: Review event (не используется, для совместимости)
        """
        print(f"\n📤 Публикация ревью в GitHub PR #{pr_number}")
        print(f"   Комментариев для публикации: {len(comments)}")
        
        url = f"{self._get_repo_path()}/issues/{pr_number}/comments"
        
        # 1. Сначала публикуем общий summary
        if body:
            print(f"\n   📝 Публикация общего summary ({len(body)} символов)...")
            payload = {"body": body}
            
            async with httpx.AsyncClient(timeout=30.0) as client:
                response = await client.post(
                    url,
                    headers=self._get_headers(),
                    json=payload
                )
                response.raise_for_status()
                print(f"   ✅ Summary опубликован!")
        
        # 2. Затем публикуем каждую проблему отдельным комментарием
        if comments:
            print(f"\n   💬 Публикация {len(comments)} отдельных комментариев...")
            for i, comment in enumerate(comments, 1):
                severity_emoji = {
                    "ERROR": "❌",
                    "WARNING": "⚠️",
                    "INFO": "ℹ️"
                }.get(comment.get("severity", "INFO").upper(), "💬")
                
                # GitHub ссылка на строку
                file_url = f"https://github.com/{self.repo_owner}/{self.repo_name}/pull/{pr_number}/files#L{comment['line_number']}"
                
                # Форматируем комментарий
                comment_body = f"{severity_emoji} **[`{comment['file_path']}:{comment['line_number']}`]({file_url})**\n\n"
                comment_body += f"**{comment.get('severity', 'INFO').upper()}**: {comment['content']}"
                
                payload = {"body": comment_body}
                
                try:
                    async with httpx.AsyncClient(timeout=30.0) as client:
                        response = await client.post(
                            url,
                            headers=self._get_headers(),
                            json=payload
                        )
                        response.raise_for_status()
                        print(f"   ✅ {i}/{len(comments)}: {comment['file_path']}:{comment['line_number']}")
                except Exception as e:
                    print(f"   ❌ {i}/{len(comments)}: Ошибка - {e}")
        
        print(f"\n   🎉 Все комментарии опубликованы!")
        return {"summary": "posted", "comments_count": len(comments)}