"""
Member Management API for WHOOSH - Handles project member invitations, roles, and collaboration.
"""
from fastapi import APIRouter, HTTPException, Depends, BackgroundTasks
from pydantic import BaseModel, Field, EmailStr
from typing import List, Dict, Optional, Any
from datetime import datetime

from app.services.member_service import MemberService
from app.services.project_service import ProjectService
from app.services.age_service import AgeService
from app.core.auth_deps import get_current_user_context

router = APIRouter(prefix="/api/members", tags=["member-management"])

# Pydantic models for request/response validation

class MemberInviteRequest(BaseModel):
    project_id: str = Field(..., min_length=1, max_length=100)
    member_email: EmailStr
    role: str = Field(..., pattern="^(owner|maintainer|developer|viewer)$")
    custom_message: Optional[str] = Field(None, max_length=1000)
    send_email: bool = True
    include_age_key: bool = True

class MemberInviteResponse(BaseModel):
    success: bool
    invitation_id: Optional[str] = None
    invitation_url: Optional[str] = None
    member_email: str
    role: str
    expires_at: Optional[str] = None
    email_sent: bool = False
    error: Optional[str] = None

class InvitationAcceptRequest(BaseModel):
    invitation_token: str
    accepter_name: str = Field(..., min_length=1, max_length=100)
    accepter_username: Optional[str] = Field(None, max_length=50)
    gitea_username: Optional[str] = Field(None, max_length=50)
    setup_preferences: Optional[Dict[str, Any]] = None

class InvitationAcceptResponse(BaseModel):
    success: bool
    member_email: str
    role: str
    project_id: str
    project_name: str
    gitea_access: Optional[Dict[str, Any]] = None
    age_access: Optional[Dict[str, Any]] = None
    permissions: List[str]
    next_steps: List[str]
    error: Optional[str] = None

class ProjectMemberInfo(BaseModel):
    email: str
    role: str
    status: str
    invited_at: str
    invited_by: str
    accepted_at: Optional[str] = None
    permissions: List[str]
    gitea_access: bool = False
    age_access: bool = False

class MemberRoleUpdateRequest(BaseModel):
    member_email: EmailStr
    new_role: str = Field(..., pattern="^(owner|maintainer|developer|viewer)$")
    reason: Optional[str] = Field(None, max_length=500)

class MemberRemovalRequest(BaseModel):
    member_email: EmailStr
    reason: Optional[str] = Field(None, max_length=500)

def get_member_service():
    """Dependency injection for member service."""
    return MemberService()

def get_project_service():
    """Dependency injection for project service."""
    return ProjectService()

def get_age_service():
    """Dependency injection for Age service."""
    return AgeService()

@router.post("/invite", response_model=MemberInviteResponse)
async def invite_member(
    request: MemberInviteRequest,
    background_tasks: BackgroundTasks,
    current_user: Dict[str, Any] = Depends(get_current_user_context),
    member_service: MemberService = Depends(get_member_service),
    project_service: ProjectService = Depends(get_project_service),
    age_service: AgeService = Depends(get_age_service)
):
    """Invite a new member to join a project."""
    try:
        # Verify project exists and user has permission to invite
        project = project_service.get_project_by_id(request.project_id)
        if not project:
            raise HTTPException(status_code=404, detail="Project not found")
        
        # TODO: Check if current user has permission to invite members
        # For now, assume permission is granted
        
        inviter_name = current_user.get("name", "WHOOSH User")
        project_name = project.get("name", request.project_id)
        
        # Generate invitation
        invitation_result = member_service.generate_member_invitation(
            project_id=request.project_id,
            member_email=request.member_email,
            role=request.role,
            inviter_name=inviter_name,
            project_name=project_name,
            custom_message=request.custom_message
        )
        
        if not invitation_result.get("created"):
            raise HTTPException(
                status_code=500, 
                detail=invitation_result.get("error", "Failed to create invitation")
            )
        
        # Send email invitation if requested
        email_sent = False
        if request.send_email:
            # Get Age public key if requested
            age_public_key = None
            if request.include_age_key:
                try:
                    project_keys = age_service.list_project_keys(request.project_id)
                    if project_keys:
                        age_public_key = project_keys[0]["public_key"]
                except Exception as e:
                    print(f"Warning: Could not retrieve Age key: {e}")
            
            # Send email in background
            background_tasks.add_task(
                member_service.send_email_invitation,
                invitation_result,
                age_public_key
            )
            email_sent = True
        
        return MemberInviteResponse(
            success=True,
            invitation_id=invitation_result["invitation_id"],
            invitation_url=invitation_result["invitation_url"],
            member_email=request.member_email,
            role=request.role,
            expires_at=invitation_result["expires_at"],
            email_sent=email_sent
        )
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to invite member: {str(e)}")

@router.get("/invitations/{invitation_id}")
async def get_invitation_details(
    invitation_id: str,
    member_service: MemberService = Depends(get_member_service)
):
    """Get invitation details for verification and display."""
    try:
        invitation_status = member_service.get_invitation_status(invitation_id)
        if not invitation_status:
            raise HTTPException(status_code=404, detail="Invitation not found")
        
        return invitation_status
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to retrieve invitation: {str(e)}")

@router.post("/invitations/{invitation_id}/accept", response_model=InvitationAcceptResponse)
async def accept_invitation(
    invitation_id: str,
    request: InvitationAcceptRequest,
    member_service: MemberService = Depends(get_member_service)
):
    """Accept a project invitation and set up member access."""
    try:
        # Validate invitation token first
        if not member_service.validate_invitation_token(invitation_id, request.invitation_token):
            raise HTTPException(status_code=401, detail="Invalid invitation token")
        
        # Prepare accepter data
        accepter_data = {
            "name": request.accepter_name,
            "username": request.accepter_username,
            "gitea_username": request.gitea_username or request.accepter_username,
            "setup_preferences": request.setup_preferences or {},
            "accepted_via": "whoosh_api"
        }
        
        # Process acceptance
        result = member_service.accept_invitation(
            invitation_id=invitation_id,
            invitation_token=request.invitation_token,
            accepter_data=accepter_data
        )
        
        if not result.get("success"):
            raise HTTPException(
                status_code=400, 
                detail=result.get("error", "Failed to accept invitation")
            )
        
        return InvitationAcceptResponse(
            success=True,
            member_email=result["member_email"],
            role=result["role"],
            project_id=result["project_id"],
            project_name=result["project_name"],
            gitea_access=result.get("gitea_access"),
            age_access=result.get("age_access"),
            permissions=result["permissions"],
            next_steps=result["next_steps"]
        )
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to accept invitation: {str(e)}")

@router.get("/projects/{project_id}", response_model=List[ProjectMemberInfo])
async def list_project_members(
    project_id: str,
    current_user: Dict[str, Any] = Depends(get_current_user_context),
    member_service: MemberService = Depends(get_member_service),
    project_service: ProjectService = Depends(get_project_service)
):
    """List all members of a project with their roles and status."""
    try:
        # Verify project exists and user has permission to view members
        project = project_service.get_project_by_id(project_id)
        if not project:
            raise HTTPException(status_code=404, detail="Project not found")
        
        # TODO: Check if current user has permission to view members
        # For now, assume permission is granted
        
        members = member_service.list_project_members(project_id)
        
        # Convert to response format
        member_info_list = []
        for member in members:
            member_info = ProjectMemberInfo(
                email=member["email"],
                role=member["role"],
                status=member["status"],
                invited_at=member["invited_at"],
                invited_by=member["invited_by"],
                accepted_at=member.get("accepted_at"),
                permissions=member["permissions"],
                gitea_access=member["status"] == "accepted",
                age_access=member["role"] in ["owner", "maintainer", "developer"]
            )
            member_info_list.append(member_info)
        
        return member_info_list
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to list members: {str(e)}")

@router.put("/projects/{project_id}/members/role")
async def update_member_role(
    project_id: str,
    request: MemberRoleUpdateRequest,
    current_user: Dict[str, Any] = Depends(get_current_user_context),
    member_service: MemberService = Depends(get_member_service),
    project_service: ProjectService = Depends(get_project_service)
):
    """Update a member's role in the project."""
    try:
        # Verify project exists and user has permission to manage members
        project = project_service.get_project_by_id(project_id)
        if not project:
            raise HTTPException(status_code=404, detail="Project not found")
        
        # TODO: Implement role updates
        # This would involve updating the member's invitation record and 
        # updating their permissions in GITEA and Age access
        
        return {
            "success": True,
            "message": f"Member role update functionality coming soon",
            "member_email": request.member_email,
            "new_role": request.new_role
        }
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to update member role: {str(e)}")

@router.delete("/projects/{project_id}/members")
async def remove_member(
    project_id: str,
    request: MemberRemovalRequest,
    current_user: Dict[str, Any] = Depends(get_current_user_context),
    member_service: MemberService = Depends(get_member_service),
    project_service: ProjectService = Depends(get_project_service)
):
    """Remove a member from the project."""
    try:
        # Verify project exists and user has permission to remove members
        project = project_service.get_project_by_id(project_id)
        if not project:
            raise HTTPException(status_code=404, detail="Project not found")
        
        # TODO: Check if current user has permission to remove members
        # For now, assume permission is granted
        
        current_user_name = current_user.get("name", "WHOOSH User")
        
        # Revoke member access
        result = member_service.revoke_member_access(
            project_id=project_id,
            member_email=request.member_email,
            revoked_by=current_user_name,
            reason=request.reason or "No reason provided"
        )
        
        if not result.get("success"):
            raise HTTPException(
                status_code=400,
                detail=result.get("error", "Failed to remove member")
            )
        
        return {
            "success": True,
            "message": "Member access revoked successfully",
            "member_email": request.member_email,
            "revoked_by": current_user_name
        }
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to remove member: {str(e)}")

@router.get("/projects/{project_id}/invitations")
async def list_project_invitations(
    project_id: str,
    status: Optional[str] = None,  # Filter by status: pending, accepted, revoked, expired
    current_user: Dict[str, Any] = Depends(get_current_user_context),
    member_service: MemberService = Depends(get_member_service),
    project_service: ProjectService = Depends(get_project_service)
):
    """List all invitations for a project with optional status filtering."""
    try:
        # Verify project exists and user has permission to view invitations
        project = project_service.get_project_by_id(project_id)
        if not project:
            raise HTTPException(status_code=404, detail="Project not found")
        
        # Get all members (which includes invitation data)
        members = member_service.list_project_members(project_id)
        
        # Filter by status if requested
        if status:
            members = [member for member in members if member["status"] == status]
        
        # Add expiration status
        for member in members:
            if member["status"] == "pending":
                # Check if invitation is expired (this would need expiration date from invitation)
                member["is_expired"] = False  # Placeholder
        
        return {
            "project_id": project_id,
            "invitations": members,
            "count": len(members),
            "filtered_by_status": status
        }
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to list invitations: {str(e)}")

@router.post("/projects/{project_id}/invitations/{invitation_id}/resend")
async def resend_invitation(
    project_id: str,
    invitation_id: str,
    background_tasks: BackgroundTasks,
    current_user: Dict[str, Any] = Depends(get_current_user_context),
    member_service: MemberService = Depends(get_member_service),
    age_service: AgeService = Depends(get_age_service)
):
    """Resend an invitation email to a member."""
    try:
        # Load invitation to verify it exists and is pending
        invitation_status = member_service.get_invitation_status(invitation_id)
        if not invitation_status:
            raise HTTPException(status_code=404, detail="Invitation not found")
        
        if invitation_status["project_id"] != project_id:
            raise HTTPException(status_code=400, detail="Invitation does not belong to this project")
        
        if invitation_status["status"] != "pending":
            raise HTTPException(status_code=400, detail="Can only resend pending invitations")
        
        if invitation_status["is_expired"]:
            raise HTTPException(status_code=400, detail="Cannot resend expired invitation")
        
        # Get Age public key for the project
        age_public_key = None
        try:
            project_keys = age_service.list_project_keys(project_id)
            if project_keys:
                age_public_key = project_keys[0]["public_key"]
        except Exception as e:
            print(f"Warning: Could not retrieve Age key: {e}")
        
        # Resend invitation email in background
        invitation_data = {
            "invitation_id": invitation_id,
            "project_name": invitation_status["project_name"],
            "member_email": invitation_status["member_email"],
            "role": invitation_status["role"],
            "inviter_name": current_user.get("name", "WHOOSH User"),
            "invitation_url": f"/invite/{invitation_id}?token={invitation_status.get('invitation_token', '')}",
            "expires_at": invitation_status["expires_at"],
            "permissions": []  # Would need to get from stored invitation
        }
        
        background_tasks.add_task(
            member_service.send_email_invitation,
            invitation_data,
            age_public_key
        )
        
        return {
            "success": True,
            "message": "Invitation email resent successfully",
            "invitation_id": invitation_id,
            "member_email": invitation_status["member_email"]
        }
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to resend invitation: {str(e)}")

# === Member Dashboard and Profile Endpoints ===

@router.get("/profile")
async def get_member_profile(
    current_user: Dict[str, Any] = Depends(get_current_user_context),
    member_service: MemberService = Depends(get_member_service)
):
    """Get current member's profile and project memberships."""
    try:
        # TODO: Implement member profile lookup across all projects
        # This would involve searching through all invitations/memberships
        
        user_email = current_user.get("email", "")
        
        return {
            "member_email": user_email,
            "name": current_user.get("name", ""),
            "projects": [],  # Placeholder for projects this member belongs to
            "total_projects": 0,
            "active_invitations": 0,
            "roles": {}  # Mapping of project_id to role
        }
        
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to get member profile: {str(e)}")

@router.get("/projects/{project_id}/permissions")
async def get_member_permissions(
    project_id: str,
    member_email: Optional[str] = None,  # If not provided, use current user
    current_user: Dict[str, Any] = Depends(get_current_user_context),
    member_service: MemberService = Depends(get_member_service)
):
    """Get detailed permissions for a member in a specific project."""
    try:
        target_email = member_email or current_user.get("email", "")
        
        # Get project members to find this member's role
        members = member_service.list_project_members(project_id)
        member_info = None
        
        for member in members:
            if member["email"] == target_email:
                member_info = member
                break
        
        if not member_info:
            raise HTTPException(status_code=404, detail="Member not found in project")
        
        return {
            "project_id": project_id,
            "member_email": target_email,
            "role": member_info["role"],
            "status": member_info["status"],
            "permissions": member_info["permissions"],
            "can_access_gitea": member_info["status"] == "accepted",
            "can_decrypt_age": member_info["role"] in ["owner", "maintainer", "developer"]
        }
        
    except HTTPException:
        raise
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Failed to get member permissions: {str(e)}")