import shlex
import re
from typing import List, Tuple, Optional
from .models import (
    RequestMethod, Header, Auth, AuthType, RequestData, DataType, ParsedCurl
)


def curl_tokenize(command: str) -> List[str]:
    """Tokenize a curl command string into arguments."""
    try:
        tokens = shlex.split(command)
    except ValueError:
        tokens = command.split()
    result = []
    i = 0
    while i < len(tokens):
        token = tokens[i]
        if token.startswith("'"):
            j = i
            while j < len(tokens) and not tokens[j].endswith("'"):
                j += 1
            if j < len(tokens):
                result.append(" ".join(tokens[i:j + 1]).strip("'"))
                i = j + 1
                continue
        result.append(token)
        i += 1
    return result


def parse_curl_command(command: str) -> ParsedCurl:
    """Parse a curl command and return a ParsedCurl object."""
    tokens = curl_tokenize(command)
    
    url = ""
    method = RequestMethod.GET
    headers: List[Header] = []
    auth: Optional[Auth] = None
    data: Optional[RequestData] = None
    cookies: dict = {}
    user_agent: Optional[str] = None
    follow_redirects = True
    timeout: Optional[int] = None
    
    i = 0
    while i < len(tokens):
        token = tokens[i]
        
        if token in ("-X", "--request"):
            if i + 1 < len(tokens):
                method_map = {
                    "GET": RequestMethod.GET,
                    "POST": RequestMethod.POST,
                    "PUT": RequestMethod.PUT,
                    "PATCH": RequestMethod.PATCH,
                    "DELETE": RequestMethod.DELETE,
                    "HEAD": RequestMethod.HEAD,
                    "OPTIONS": RequestMethod.OPTIONS,
                }
                method_str = tokens[i + 1].upper()
                method = method_map.get(method_str, RequestMethod.GET)
                i += 2
            else:
                i += 1
        
        elif token in ("-H", "--header"):
            if i + 1 < len(tokens):
                header_str = tokens[i + 1]
                if ": " in header_str:
                    key, value = header_str.split(": ", 1)
                    headers.append(Header(key=key, value=value))
                i += 2
            else:
                i += 1
        
        elif token in ("-d", "--data", "--data-raw", "--data-binary"):
            if i + 1 < len(tokens):
                data_str = tokens[i + 1]
                if data_str.startswith("{") and data_str.endswith("}"):
                    import json
                    try:
                        json_data = json.loads(data_str)
                        data = RequestData(data_type=DataType.JSON, json_data=json_data)
                    except json.JSONDecodeError:
                        data = RequestData(data_type=DataType.RAW, content=data_str)
                else:
                    data = RequestData(data_type=DataType.RAW, content=data_str)
                i += 2
            else:
                i += 1
        
        elif token == "--data-json":
            if i + 1 < len(tokens):
                import json
                try:
                    json_data = json.loads(tokens[i + 1])
                    data = RequestData(data_type=DataType.JSON, json_data=json_data)
                except json.JSONDecodeError:
                    data = RequestData(data_type=DataType.RAW, content=tokens[i + 1])
                i += 2
            else:
                i += 1
        
        elif token in ("-u", "--user"):
            if i + 1 < len(tokens):
                auth_str = tokens[i + 1]
                if ":" in auth_str:
                    parts = auth_str.split(":", 1)
                    auth = Auth(auth_type=AuthType.BASIC, username=parts[0], password=parts[1])
                else:
                    auth = Auth(auth_type=AuthType.BASIC, username=auth_str)
                i += 2
            else:
                i += 1
        
        elif token == "--bearer":
            if i + 1 < len(tokens):
                auth = Auth(auth_type=AuthType.BEARER, token=tokens[i + 1])
                i += 2
            else:
                i += 1
        
        elif token in ("-b", "--cookie"):
            if i + 1 < len(tokens):
                cookie_str = tokens[i + 1]
                for pair in cookie_str.split(";"):
                    if "=" in pair:
                        k, v = pair.split("=", 1)
                        cookies[k.strip()] = v.strip()
                i += 2
            else:
                i += 1
        
        elif token in ("-A", "--user-agent"):
            if i + 1 < len(tokens):
                user_agent = tokens[i + 1]
                i += 2
            else:
                i += 1
        
        elif token == "--url":
            if i + 1 < len(tokens):
                url = tokens[i + 1]
                i += 2
            else:
                i += 1
        
        elif token == "-L":
            follow_redirects = True
            i += 1
        
        elif token == "--connect-timeout":
            if i + 1 < len(tokens):
                try:
                    timeout = int(tokens[i + 1])
                except ValueError:
                    pass
                i += 2
            else:
                i += 1
        
        elif token.startswith("http://") or token.startswith("https://"):
            url = token
            i += 1
        
        elif not token.startswith("-"):
            if not url:
                url = token
            i += 1
        
        else:
            i += 1
    
    if auth and auth.get_header():
        auth_header = auth.get_header()
        if auth_header:
            headers.append(auth_header)
    
    return ParsedCurl(
        url=url,
        method=method,
        headers=headers,
        auth=auth,
        data=data,
        cookies=cookies,
        user_agent=user_agent,
        follow_redirects=follow_redirects,
        timeout=timeout,
    )