from fastapi import APIRouter, HTTPException, Query
from typing import List, Dict, Any, Optional
import logging
import re
from datetime import datetime, time as datetime_time

from app.services.nomad_client import NomadService
from app.services.config_service import ConfigService

# Configure logging
logger = logging.getLogger(__name__)

router = APIRouter()
nomad_service = NomadService()
config_service = ConfigService()

def format_logs_with_line_breaks(logs: str) -> str:
    """Format logs with proper line breaks."""
    if not logs:
        return logs
    
    # Ensure proper line breaks
    formatted = logs.replace('\\n', '\n')
    
    # Clean up any double line breaks
    formatted = re.sub(r'\n{3,}', '\n\n', formatted)
    
    return formatted.strip()

def filter_logs_by_time(logs: str, start_time: str = None, end_time: str = None) -> str:
    """Filter logs by time range."""
    if not logs or (not start_time and not end_time):
        return logs
    
    lines = logs.split('\n')
    filtered_lines = []
    
    for line in lines:
        # Extract timestamp from log line (assumes format: YYYY-MM-DD HH:MM:SS)
        timestamp_match = re.search(r'(\d{4}-\d{2}-\d{2}\s+\d{2}:\d{2}:\d{2})', line)
        if not timestamp_match:
            # If no timestamp, include the line (might be continuation)
            filtered_lines.append(line)
            continue
            
        try:
            log_time = datetime.strptime(timestamp_match.group(1), '%Y-%m-%d %H:%M:%S')
            log_time_only = log_time.time()
            
            # Parse time filters
            include_line = True
            
            if start_time:
                if ':' in start_time and len(start_time.split(':')) == 2:
                    start_t = datetime.strptime(start_time, '%H:%M').time()
                    if log_time_only < start_t:
                        include_line = False
                        
            if end_time and include_line:
                if ':' in end_time and len(end_time.split(':')) == 2:
                    end_t = datetime.strptime(end_time, '%H:%M').time()
                    if log_time_only > end_t:
                        include_line = False
            
            if include_line:
                filtered_lines.append(line)
                
        except ValueError:
            # If time parsing fails, include the line
            filtered_lines.append(line)
    
    return '\n'.join(filtered_lines)

def filter_logs_by_level(logs: str, log_level: str) -> str:
    """Filter logs by log level. Supports multiple levels separated by |"""
    if not logs or not log_level:
        return logs
    
    lines = logs.split('\n')
    filtered_lines = []
    
    # Handle multiple log levels separated by |
    levels = [level.strip().upper() for level in log_level.split('|')]
    level_patterns = [re.compile(rf'\b{level}\b', re.IGNORECASE) for level in levels]
    
    for line in lines:
        if any(pattern.search(line) for pattern in level_patterns):
            filtered_lines.append(line)
    
    return '\n'.join(filtered_lines)

def search_logs(logs: str, search_term: str) -> str:
    """Search logs for specific term."""
    if not logs or not search_term:
        return logs
    
    lines = logs.split('\n')
    filtered_lines = []
    search_pattern = re.compile(re.escape(search_term), re.IGNORECASE)
    
    for line in lines:
        if search_pattern.search(line):
            filtered_lines.append(line)
    
    return '\n'.join(filtered_lines)

def limit_log_lines(logs: str, lines_limit: int) -> str:
    """Limit number of log lines returned."""
    if not logs or not lines_limit:
        return logs
    
    lines = logs.split('\n')
    return '\n'.join(lines[-lines_limit:])  # Return most recent lines

def process_logs(logs: str, start_time: str = None, end_time: str = None, 
                log_level: str = None, search: str = None, lines: int = None,
                formatted: bool = True) -> str:
    """Process logs with all filters and formatting."""
    if not logs:
        return logs
    
    # Apply formatting first
    if formatted:
        logs = format_logs_with_line_breaks(logs)
    
    # Apply time filtering
    if start_time or end_time:
        logs = filter_logs_by_time(logs, start_time, end_time)
    
    # Apply log level filtering
    if log_level:
        logs = filter_logs_by_level(logs, log_level)
    
    # Apply search filtering
    if search:
        logs = search_logs(logs, search)
    
    # Limit lines if specified
    if lines:
        logs = limit_log_lines(logs, lines)
    
    return logs

# More specific routes first
@router.get("/repository/{repository}")
async def get_repository_logs(
    repository: str,
    log_type: str = Query("stderr", description="Log type: stdout or stderr"),
    limit: int = Query(1, description="Number of allocations to return logs for"),
    plain_text: bool = Query(False, description="Return plain text logs instead of JSON")
):
    """Get logs for a repository's associated job."""
    # Get the job info for the repository
    job_info = config_service.get_job_from_repository(repository)
    if not job_info:
        raise HTTPException(status_code=404, detail=f"No job found for repository: {repository}")
    
    job_id = job_info.get("job_id")
    namespace = job_info.get("namespace")
    
    logger.info(f"Getting logs for job {job_id} in namespace {namespace}")
    
    # Create a custom service with the specific namespace if provided
    custom_nomad = NomadService()
    if namespace:
        custom_nomad.namespace = namespace
    
    # Get allocations for the job
    allocations = custom_nomad.get_allocations(job_id)
    if not allocations:
        raise HTTPException(status_code=404, detail=f"No allocations found for job {job_id}")
    
    logger.info(f"Found {len(allocations)} allocations for job {job_id}")
    
    # Sort allocations by creation time (descending)
    sorted_allocations = sorted(
        allocations, 
        key=lambda a: a.get("CreateTime", 0), 
        reverse=True
    )
    
    # Limit the number of allocations
    allocations_to_check = sorted_allocations[:limit]
    
    # Also get the job info to determine task names
    job = custom_nomad.get_job(job_id)
    
    # Collect logs for each allocation and task
    result = []
    error_messages = []
    
    for alloc in allocations_to_check:
        # Use the full UUID of the allocation
        alloc_id = alloc.get("ID")
        if not alloc_id:
            logger.warning(f"Allocation ID not found in allocation data")
            error_messages.append("Allocation ID not found in allocation data")
            continue
            
        logger.info(f"Processing allocation {alloc_id} for job {job_id}")
        
        # Get task name from the allocation's TaskStates
        task_states = alloc.get("TaskStates", {})
        if not task_states:
            logger.warning(f"No task states found in allocation {alloc_id}")
            error_messages.append(f"No task states found in allocation {alloc_id}")
            
        for task_name, task_state in task_states.items():
            try:
                logger.info(f"Retrieving logs for allocation {alloc_id}, task {task_name}")
                
                logs = custom_nomad.get_allocation_logs(alloc_id, task_name, log_type)
                
                # Check if logs is an error message
                if logs and isinstance(logs, str):
                    if logs.startswith("Error:") or logs.startswith("No "):
                        logger.warning(f"Error retrieving logs for {task_name}: {logs}")
                        error_messages.append(logs)
                        continue
                
                # Only add if we got some logs
                if logs:
                    result.append({
                        "alloc_id": alloc_id,
                        "task": task_name,
                        "type": log_type,
                        "create_time": alloc.get("CreateTime"),
                        "logs": logs
                    })
                    logger.info(f"Successfully retrieved logs for {task_name}")
                else:
                    error_msg = f"No logs found for {task_name}"
                    logger.warning(error_msg)
                    error_messages.append(error_msg)
            except Exception as e:
                # Log but continue to try other tasks
                error_msg = f"Failed to get logs for {alloc_id}/{task_name}: {str(e)}"
                logger.error(error_msg)
                error_messages.append(error_msg)
    
    # Return as plain text if requested
    if plain_text:
        if not result:
            if error_messages:
                return f"No logs found for this job. Errors: {'; '.join(error_messages)}"
            return "No logs found for this job"
        return "\n\n".join([f"=== {r.get('task')} ===\n{r.get('logs')}" for r in result])
    
    # Otherwise return as JSON
    return {
        "job_id": job_id,
        "repository": repository,
        "namespace": namespace,
        "allocation_logs": result,
        "errors": error_messages if error_messages else None
    }

@router.get("/job/{job_id}")
async def get_job_logs(
    job_id: str,
    namespace: str = Query(None, description="Nomad namespace"),
    log_type: str = Query("stderr", description="Log type: stdout or stderr"),
    limit: int = Query(1, description="Number of allocations to return logs for"),
    plain_text: bool = Query(False, description="Return plain text logs instead of JSON"),
    # New filtering parameters
    start_time: str = Query(None, description="Start time filter (YYYY-MM-DD HH:MM or HH:MM)"),
    end_time: str = Query(None, description="End time filter (YYYY-MM-DD HH:MM or HH:MM)"),
    log_level: str = Query(None, description="Filter by log level: ERROR, WARNING, INFO, DEBUG"),
    search: str = Query(None, description="Search term to filter logs"),
    lines: int = Query(None, description="Number of log lines to return (most recent)"),
    formatted: bool = Query(True, description="Return formatted logs with proper line breaks")
):
    """Get logs for the most recent allocations of a job."""
    # Create a custom service with the specific namespace if provided
    custom_nomad = NomadService()
    if namespace:
        custom_nomad.namespace = namespace
        logger.info(f"Getting logs for job {job_id} in namespace {namespace}")
    else:
        logger.info(f"Getting logs for job {job_id} in default namespace")
    
    # Get all allocations for the job
    allocations = custom_nomad.get_allocations(job_id)
    if not allocations:
        raise HTTPException(status_code=404, detail=f"No allocations found for job {job_id}")
    
    logger.info(f"Found {len(allocations)} allocations for job {job_id}")
    
    # Sort allocations by creation time (descending)
    sorted_allocations = sorted(
        allocations, 
        key=lambda a: a.get("CreateTime", 0), 
        reverse=True
    )
    
    # Limit the number of allocations
    allocations_to_check = sorted_allocations[:limit]
    
    # Collect logs for each allocation and task
    result = []
    for alloc in allocations_to_check:
        alloc_id = alloc.get("ID")
        if not alloc_id:
            logger.warning(f"Allocation ID not found in allocation data")
            continue
            
        logger.info(f"Processing allocation {alloc_id} for job {job_id}")
        
        # Get task names from the allocation's TaskStates
        task_states = alloc.get("TaskStates", {})
        for task_name, task_state in task_states.items():
            try:
                logger.info(f"Retrieving logs for allocation {alloc_id}, task {task_name}")
                
                logs = custom_nomad.get_allocation_logs(alloc_id, task_name, log_type)
                # Only add if we got some logs and not an error message
                if logs and not logs.startswith("No") and not logs.startswith("Error"):
                    # Process logs with filters
                    processed_logs = process_logs(
                        logs, 
                        start_time=start_time, 
                        end_time=end_time,
                        log_level=log_level, 
                        search=search, 
                        lines=lines,
                        formatted=formatted
                    )
                    
                    result.append({
                        "alloc_id": alloc_id,
                        "task": task_name,
                        "type": log_type,
                        "create_time": alloc.get("CreateTime"),
                        "logs": processed_logs
                    })
                    logger.info(f"Successfully retrieved logs for {task_name}")
                else:
                    logger.warning(f"No logs found for {task_name}: {logs}")
            except Exception as e:
                # Log but continue to try other tasks
                logger.error(f"Failed to get logs for {alloc_id}/{task_name}: {str(e)}")
    
    # Return as plain text if requested
    if plain_text:
        if not result:
            return "No logs found for this job"
        
        # Combine all logs with task separators
        combined_logs = []
        for r in result:
            task_logs = r.get('logs', '')
            if task_logs:
                combined_logs.append(f"=== {r.get('task')} ===\n{task_logs}")
        
        return "\n\n".join(combined_logs)
    
    # Otherwise return as JSON
    return {
        "job_id": job_id,
        "namespace": namespace,
        "allocation_logs": result
    }

@router.get("/latest/{job_id}")
async def get_latest_allocation_logs(
    job_id: str,
    log_type: str = Query("stderr", description="Log type: stdout or stderr"),
    plain_text: bool = Query(False, description="Return plain text logs instead of JSON")
):
    """Get logs from the latest allocation of a job."""
    # Get all allocations for the job
    allocations = nomad_service.get_allocations(job_id)
    if not allocations:
        raise HTTPException(status_code=404, detail=f"No allocations found for job {job_id}")
    
    # Sort allocations by creation time (descending)
    sorted_allocations = sorted(
        allocations, 
        key=lambda a: a.get("CreateTime", 0), 
        reverse=True
    )
    
    # Get the latest allocation
    latest_alloc = sorted_allocations[0]
    alloc_id = latest_alloc.get("ID")
    
    # Get task group and task information
    job = nomad_service.get_job(job_id)
    task_groups = job.get("TaskGroups", [])
    
    # Collect logs for each task in the latest allocation
    result = []
    for task_group in task_groups:
        tasks = task_group.get("Tasks", [])
        for task in tasks:
            task_name = task.get("Name")
            try:
                logs = nomad_service.get_allocation_logs(alloc_id, task_name, log_type)
                result.append({
                    "alloc_id": alloc_id,
                    "task": task_name,
                    "type": log_type,
                    "create_time": latest_alloc.get("CreateTime"),
                    "logs": logs
                })
            except Exception as e:
                # Skip if logs cannot be retrieved for this task
                pass
    
    # Return as plain text if requested
    if plain_text:
        return "\n\n".join([f"=== {r['task']} ===\n{r['logs']}" for r in result])
    
    # Otherwise return as JSON
    return {
        "job_id": job_id,
        "latest_allocation": alloc_id,
        "task_logs": result
    }

@router.get("/build/{job_id}")
async def get_build_logs(job_id: str, plain_text: bool = Query(False)):
    """Get build logs for a job (usually stderr logs from the latest allocation)."""
    # This is a convenience endpoint that returns stderr logs from the latest allocation
    return await get_latest_allocation_logs(job_id, "stderr", plain_text)

@router.get("/errors/{job_id}")
async def get_error_logs(
    job_id: str, 
    namespace: str = Query(None, description="Nomad namespace"),
    start_time: str = Query(None, description="Start time filter (HH:MM format, e.g., 20:00)"),
    end_time: str = Query(None, description="End time filter (HH:MM format, e.g., 06:00)"),
    plain_text: bool = Query(True, description="Return plain text logs instead of JSON")
):
    """Get error and warning logs for a job, with optional time filtering."""
    return await get_job_logs(
        job_id=job_id,
        namespace=namespace,
        log_type="stderr",
        limit=5,  # Check more allocations for errors
        plain_text=plain_text,
        start_time=start_time,
        end_time=end_time,
        log_level="WARNING|ERROR|EMERGENCY|CRITICAL",  # Multiple levels
        formatted=True
    )

@router.get("/search/{job_id}")
async def search_job_logs(
    job_id: str,
    q: str = Query(..., description="Search term"),
    namespace: str = Query(None, description="Nomad namespace"),
    log_type: str = Query("stderr", description="Log type: stdout or stderr"),
    limit: int = Query(3, description="Number of allocations to search"),
    lines: int = Query(100, description="Number of matching lines to return"),
    plain_text: bool = Query(True, description="Return plain text logs instead of JSON")
):
    """Search job logs for specific terms."""
    return await get_job_logs(
        job_id=job_id,
        namespace=namespace,
        log_type=log_type,
        limit=limit,
        plain_text=plain_text,
        search=q,
        lines=lines,
        formatted=True
    )

# Generic allocation logs route last
@router.get("/allocation/{alloc_id}/{task}")
async def get_allocation_logs(
    alloc_id: str, 
    task: str, 
    log_type: str = Query("stderr", description="Log type: stdout or stderr"),
    plain_text: bool = Query(False, description="Return plain text logs instead of JSON")
):
    """Get logs for a specific allocation and task."""
    # Validate log_type
    if log_type not in ["stdout", "stderr"]:
        raise HTTPException(status_code=400, detail="Log type must be stdout or stderr")
    
    # Get logs from Nomad
    logs = nomad_service.get_allocation_logs(alloc_id, task, log_type)
    
    # Return as plain text if requested
    if plain_text:
        return logs
    
    # Otherwise return as JSON
    return {"alloc_id": alloc_id, "task": task, "type": log_type, "logs": logs}