package orchestrator

import (
	"context"
	"fmt"
	"time"

	"github.com/chorus-services/whoosh/internal/composer"
	"github.com/chorus-services/whoosh/internal/council"
	"github.com/docker/docker/api/types/swarm"
	"github.com/google/uuid"
	"github.com/jackc/pgx/v5/pgxpool"
	"github.com/rs/zerolog/log"
)

// AgentDeployer manages deployment of agent containers for teams
type AgentDeployer struct {
	swarmManager *SwarmManager
	db           *pgxpool.Pool
	registry     string
	ctx          context.Context
	cancel       context.CancelFunc
}

// NewAgentDeployer creates a new agent deployer
func NewAgentDeployer(swarmManager *SwarmManager, db *pgxpool.Pool, registry string) *AgentDeployer {
	ctx, cancel := context.WithCancel(context.Background())
	
	if registry == "" {
		registry = "registry.home.deepblack.cloud"
	}
	
	return &AgentDeployer{
		swarmManager: swarmManager,
		db:           db,
		registry:     registry,
		ctx:          ctx,
		cancel:       cancel,
	}
}

// Close shuts down the agent deployer
func (ad *AgentDeployer) Close() error {
	ad.cancel()
	return nil
}

// DeploymentRequest represents a request to deploy agents for a team
type DeploymentRequest struct {
	TeamID          uuid.UUID                  `json:"team_id"`
	TaskID          uuid.UUID                  `json:"task_id"`
	TeamComposition *composer.TeamComposition  `json:"team_composition"`
	TaskContext     *TaskContext              `json:"task_context"`
	DeploymentMode  string                    `json:"deployment_mode"` // immediate, scheduled, manual
}

// DeploymentResult represents the result of a deployment operation
type DeploymentResult struct {
	TeamID           uuid.UUID              `json:"team_id"`
	TaskID           uuid.UUID              `json:"task_id"`
	DeployedServices []DeployedService      `json:"deployed_services"`
	Status           string                 `json:"status"` // success, partial, failed
	Message          string                 `json:"message"`
	DeployedAt       time.Time              `json:"deployed_at"`
	Errors           []string               `json:"errors,omitempty"`
}

// DeployedService represents a successfully deployed service
type DeployedService struct {
	ServiceID    string `json:"service_id"`
	ServiceName  string `json:"service_name"`
	AgentRole    string `json:"agent_role"`
	AgentID      string `json:"agent_id"`
	Image        string `json:"image"`
	Status       string `json:"status"`
}

// CouncilDeploymentRequest represents a request to deploy council agents
type CouncilDeploymentRequest struct {
	CouncilID         uuid.UUID                    `json:"council_id"`
	ProjectName       string                       `json:"project_name"`
	CouncilComposition *council.CouncilComposition `json:"council_composition"`
	ProjectContext    *CouncilProjectContext       `json:"project_context"`
	DeploymentMode    string                       `json:"deployment_mode"` // immediate, scheduled, manual
}

// CouncilProjectContext contains the project information for council agents
type CouncilProjectContext struct {
	ProjectName     string `json:"project_name"`
	Repository      string `json:"repository"`
	ProjectBrief    string `json:"project_brief"`
	Constraints     string `json:"constraints,omitempty"`
	TechLimits      string `json:"tech_limits,omitempty"`
	ComplianceNotes string `json:"compliance_notes,omitempty"`
	Targets         string `json:"targets,omitempty"`
	ExternalURL     string `json:"external_url,omitempty"`
}

// DeployTeamAgents deploys all agents for a team
func (ad *AgentDeployer) DeployTeamAgents(request *DeploymentRequest) (*DeploymentResult, error) {
	log.Info().
		Str("team_id", request.TeamID.String()).
		Str("task_id", request.TaskID.String()).
		Int("agent_matches", len(request.TeamComposition.AgentMatches)).
		Msg("🚀 Starting team agent deployment")
	
	result := &DeploymentResult{
		TeamID:           request.TeamID,
		TaskID:           request.TaskID,
		DeployedServices: []DeployedService{},
		DeployedAt:       time.Now(),
		Errors:           []string{},
	}
	
	// Deploy each agent in the team composition
	for _, agentMatch := range request.TeamComposition.AgentMatches {
		service, err := ad.deploySingleAgent(request, agentMatch)
		if err != nil {
			errorMsg := fmt.Sprintf("Failed to deploy agent %s for role %s: %v", 
				agentMatch.Agent.Name, agentMatch.Role.Name, err)
			result.Errors = append(result.Errors, errorMsg)
			log.Error().
				Err(err).
				Str("agent_id", agentMatch.Agent.ID.String()).
				Str("role", agentMatch.Role.Name).
				Msg("Failed to deploy agent")
			continue
		}
		
		deployedService := DeployedService{
			ServiceID:   service.ID,
			ServiceName: service.Spec.Name,
			AgentRole:   agentMatch.Role.Name,
			AgentID:     agentMatch.Agent.ID.String(),
			Image:       service.Spec.TaskTemplate.ContainerSpec.Image,
			Status:      "deploying",
		}
		
		result.DeployedServices = append(result.DeployedServices, deployedService)
		
		// Update database with deployment info
		err = ad.recordDeployment(request.TeamID, request.TaskID, agentMatch, service.ID)
		if err != nil {
			log.Error().
				Err(err).
				Str("service_id", service.ID).
				Msg("Failed to record deployment in database")
		}
	}
	
	// Determine overall deployment status
	if len(result.Errors) == 0 {
		result.Status = "success"
		result.Message = fmt.Sprintf("Successfully deployed %d agents", len(result.DeployedServices))
	} else if len(result.DeployedServices) > 0 {
		result.Status = "partial"
		result.Message = fmt.Sprintf("Deployed %d/%d agents with %d errors", 
			len(result.DeployedServices), 
			len(request.TeamComposition.AgentMatches),
			len(result.Errors))
	} else {
		result.Status = "failed"
		result.Message = "Failed to deploy any agents"
	}
	
	// Update team deployment status in database
	err := ad.updateTeamDeploymentStatus(request.TeamID, result.Status, result.Message)
	if err != nil {
		log.Error().
			Err(err).
			Str("team_id", request.TeamID.String()).
			Msg("Failed to update team deployment status")
	}
	
	log.Info().
		Str("team_id", request.TeamID.String()).
		Str("status", result.Status).
		Int("deployed", len(result.DeployedServices)).
		Int("errors", len(result.Errors)).
		Msg("✅ Team agent deployment completed")
	
	return result, nil
}

// selectAgentImage determines the appropriate CHORUS image for the agent role
func (ad *AgentDeployer) selectAgentImage(roleName string, agent *composer.Agent) string {
	// All agents use the same CHORUS image, but with different configurations
	// The image handles role specialization internally based on environment variables
	return "docker.io/anthonyrawlins/chorus:backbeat-v2.0.1"
}

// buildAgentEnvironment creates environment variables for CHORUS agent configuration
func (ad *AgentDeployer) buildAgentEnvironment(request *DeploymentRequest, agentMatch *composer.AgentMatch) map[string]string {
	env := map[string]string{
		// Core CHORUS configuration - just pass the agent name from human-roles.yaml
		// CHORUS will handle its own prompt composition and system behavior
		"CHORUS_AGENT_NAME":    agentMatch.Role.Name, // This maps to human-roles.yaml agent definition
		"CHORUS_TEAM_ID":       request.TeamID.String(),
		"CHORUS_TASK_ID":       request.TaskID.String(),
		
		// Essential task context
		"CHORUS_PROJECT":       request.TaskContext.Repository,
		"CHORUS_TASK_TITLE":    request.TaskContext.IssueTitle,
		"CHORUS_TASK_DESC":     request.TaskContext.IssueDescription,
		"CHORUS_PRIORITY":      request.TaskContext.Priority,
		"CHORUS_EXTERNAL_URL":  request.TaskContext.ExternalURL,
		
		// WHOOSH coordination
		"WHOOSH_COORDINATOR":   "true",
		"WHOOSH_ENDPOINT":      "http://whoosh:8080",
		
		// Docker access for CHORUS sandbox management
		"DOCKER_HOST":          "unix:///var/run/docker.sock",
	}
	
	return env
}

// Note: CHORUS handles its own prompt composition from human-roles.yaml
// We just need to pass the agent name and essential task context

// determineAgentType maps role to agent type for resource allocation
func (ad *AgentDeployer) determineAgentType(agentMatch *composer.AgentMatch) string {
	// Simple mapping for now - could be enhanced based on role complexity
	return "standard"
}

// calculateResources determines resource requirements for the agent
func (ad *AgentDeployer) calculateResources(agentMatch *composer.AgentMatch) ResourceLimits {
	// Standard resource allocation for CHORUS agents
	// CHORUS handles its own resource management internally
	return ResourceLimits{
		CPULimit:      1000000000, // 1 CPU core
		MemoryLimit:   1073741824, // 1GB RAM
		CPURequest:    500000000,  // 0.5 CPU core
		MemoryRequest: 536870912,  // 512MB RAM
	}
}

// buildAgentVolumes creates volume mounts for CHORUS agents
func (ad *AgentDeployer) buildAgentVolumes(request *DeploymentRequest) []VolumeMount {
	return []VolumeMount{
		{
			Type:     "bind",
			Source:   "/var/run/docker.sock",
			Target:   "/var/run/docker.sock",
			ReadOnly: false, // CHORUS needs Docker access for sandboxing
		},
		{
			Type:   "volume",
			Source: fmt.Sprintf("whoosh-workspace-%s", request.TeamID.String()),
			Target: "/workspace",
			ReadOnly: false,
		},
	}
}

// buildAgentPlacement creates placement constraints for agents
func (ad *AgentDeployer) buildAgentPlacement(agentMatch *composer.AgentMatch) PlacementConfig {
	return PlacementConfig{
		Constraints: []string{
			"node.role==worker", // Prefer worker nodes for agent containers
		},
		// Note: Placement preferences removed for compilation compatibility
	}
}

// deploySingleAgent deploys a single agent for a specific role
func (ad *AgentDeployer) deploySingleAgent(request *DeploymentRequest, agentMatch *composer.AgentMatch) (*swarm.Service, error) {
	// Determine agent image based on role
	image := ad.selectAgentImage(agentMatch.Role.Name, agentMatch.Agent)
	
	// Build deployment configuration
	config := &AgentDeploymentConfig{
		TeamID:    request.TeamID.String(),
		TaskID:    request.TaskID.String(),
		AgentRole: agentMatch.Role.Name,
		AgentType: ad.determineAgentType(agentMatch),
		Image:     image,
		Replicas:  1, // Start with single replica per agent
		Resources: ad.calculateResources(agentMatch),
		Environment: ad.buildAgentEnvironment(request, agentMatch),
		TaskContext: *request.TaskContext,
		Networks:    []string{"chorus_default"},
		Volumes:     ad.buildAgentVolumes(request),
		Placement:   ad.buildAgentPlacement(agentMatch),
	}
	
	// Deploy the service
	service, err := ad.swarmManager.DeployAgent(config)
	if err != nil {
		return nil, fmt.Errorf("failed to deploy agent service: %w", err)
	}
	
	return service, nil
}

// recordDeployment records agent deployment information in the database
func (ad *AgentDeployer) recordDeployment(teamID uuid.UUID, taskID uuid.UUID, agentMatch *composer.AgentMatch, serviceID string) error {
	query := `
		INSERT INTO agent_deployments (team_id, task_id, agent_id, role_id, service_id, status, deployed_at)
		VALUES ($1, $2, $3, $4, $5, $6, NOW())
	`
	
	_, err := ad.db.Exec(ad.ctx, query, teamID, taskID, agentMatch.Agent.ID, agentMatch.Role.ID, serviceID, "deployed")
	return err
}

// updateTeamDeploymentStatus updates the team deployment status in the database
func (ad *AgentDeployer) updateTeamDeploymentStatus(teamID uuid.UUID, status, message string) error {
	query := `
		UPDATE teams 
		SET deployment_status = $1, deployment_message = $2, updated_at = NOW()
		WHERE id = $3
	`
	
	_, err := ad.db.Exec(ad.ctx, query, status, message, teamID)
	return err
}

// DeployCouncilAgents deploys all agents for a project kickoff council
func (ad *AgentDeployer) DeployCouncilAgents(request *CouncilDeploymentRequest) (*council.CouncilDeploymentResult, error) {
	log.Info().
		Str("council_id", request.CouncilID.String()).
		Str("project_name", request.ProjectName).
		Int("core_agents", len(request.CouncilComposition.CoreAgents)).
		Int("optional_agents", len(request.CouncilComposition.OptionalAgents)).
		Msg("🎭 Starting council agent deployment")
	
	result := &council.CouncilDeploymentResult{
		CouncilID:      request.CouncilID,
		ProjectName:    request.ProjectName,
		DeployedAgents: []council.DeployedCouncilAgent{},
		DeployedAt:     time.Now(),
		Errors:         []string{},
	}
	
	// Deploy core agents (required)
	for _, agent := range request.CouncilComposition.CoreAgents {
		deployedAgent, err := ad.deploySingleCouncilAgent(request, agent)
		if err != nil {
			errorMsg := fmt.Sprintf("Failed to deploy core agent %s (%s): %v", 
				agent.AgentName, agent.RoleName, err)
			result.Errors = append(result.Errors, errorMsg)
			log.Error().
				Err(err).
				Str("agent_id", agent.AgentID).
				Str("role", agent.RoleName).
				Msg("Failed to deploy core council agent")
			continue
		}
		
		result.DeployedAgents = append(result.DeployedAgents, *deployedAgent)
		
		// Update database with deployment info
		err = ad.recordCouncilAgentDeployment(request.CouncilID, agent, deployedAgent.ServiceID)
		if err != nil {
			log.Error().
				Err(err).
				Str("service_id", deployedAgent.ServiceID).
				Msg("Failed to record council agent deployment in database")
		}
	}
	
	// Deploy optional agents (best effort)
	for _, agent := range request.CouncilComposition.OptionalAgents {
		deployedAgent, err := ad.deploySingleCouncilAgent(request, agent)
		if err != nil {
			// Optional agents failing is not critical
			log.Warn().
				Err(err).
				Str("agent_id", agent.AgentID).
				Str("role", agent.RoleName).
				Msg("Failed to deploy optional council agent (non-critical)")
			continue
		}
		
		result.DeployedAgents = append(result.DeployedAgents, *deployedAgent)
		
		// Update database with deployment info
		err = ad.recordCouncilAgentDeployment(request.CouncilID, agent, deployedAgent.ServiceID)
		if err != nil {
			log.Error().
				Err(err).
				Str("service_id", deployedAgent.ServiceID).
				Msg("Failed to record council agent deployment in database")
		}
	}
	
	// Determine overall deployment status
	coreAgentsCount := len(request.CouncilComposition.CoreAgents)
	deployedCoreAgents := 0
	
	for _, deployedAgent := range result.DeployedAgents {
		// Check if this deployed agent is a core agent
		for _, coreAgent := range request.CouncilComposition.CoreAgents {
			if coreAgent.RoleName == deployedAgent.RoleName {
				deployedCoreAgents++
				break
			}
		}
	}
	
	if deployedCoreAgents == coreAgentsCount {
		result.Status = "success"
		result.Message = fmt.Sprintf("Successfully deployed %d agents (%d core, %d optional)", 
			len(result.DeployedAgents), deployedCoreAgents, len(result.DeployedAgents)-deployedCoreAgents)
	} else if deployedCoreAgents > 0 {
		result.Status = "partial"
		result.Message = fmt.Sprintf("Deployed %d/%d core agents with %d errors", 
			deployedCoreAgents, coreAgentsCount, len(result.Errors))
	} else {
		result.Status = "failed"
		result.Message = "Failed to deploy any core council agents"
	}
	
	// Update council deployment status in database
	err := ad.updateCouncilDeploymentStatus(request.CouncilID, result.Status, result.Message)
	if err != nil {
		log.Error().
			Err(err).
			Str("council_id", request.CouncilID.String()).
			Msg("Failed to update council deployment status")
	}
	
	log.Info().
		Str("council_id", request.CouncilID.String()).
		Str("status", result.Status).
		Int("deployed", len(result.DeployedAgents)).
		Int("errors", len(result.Errors)).
		Msg("✅ Council agent deployment completed")
	
	return result, nil
}

// deploySingleCouncilAgent deploys a single council agent
func (ad *AgentDeployer) deploySingleCouncilAgent(request *CouncilDeploymentRequest, agent council.CouncilAgent) (*council.DeployedCouncilAgent, error) {
	// Use the CHORUS image for all council agents
	image := "docker.io/anthonyrawlins/chorus:backbeat-v2.0.1"
	
	// Build council-specific deployment configuration
	config := &AgentDeploymentConfig{
		TeamID:    request.CouncilID.String(), // Use council ID as team ID
		TaskID:    request.CouncilID.String(), // Use council ID as task ID
		AgentRole: agent.RoleName,
		AgentType: "council",
		Image:     image,
		Replicas:  1, // Single replica per council agent
		Resources: ad.calculateCouncilResources(agent),
		Environment: ad.buildCouncilAgentEnvironment(request, agent),
		TaskContext: TaskContext{
			Repository:       request.ProjectContext.Repository,
			IssueTitle:       request.ProjectContext.ProjectName,
			IssueDescription: request.ProjectContext.ProjectBrief,
			Priority:         "high", // Council formation is always high priority
			ExternalURL:      request.ProjectContext.ExternalURL,
		},
		Networks:  []string{"chorus_default"}, // Connect to CHORUS network
		Volumes:   ad.buildCouncilAgentVolumes(request),
		Placement: ad.buildCouncilAgentPlacement(agent),
	}
	
	// Deploy the service
	service, err := ad.swarmManager.DeployAgent(config)
	if err != nil {
		return nil, fmt.Errorf("failed to deploy council agent service: %w", err)
	}
	
	// Create deployed agent result
	deployedAgent := &council.DeployedCouncilAgent{
		ServiceID:   service.ID,
		ServiceName: service.Spec.Name,
		RoleName:    agent.RoleName,
		AgentID:     agent.AgentID,
		Image:       image,
		Status:      "deploying",
		DeployedAt:  time.Now(),
	}
	
	return deployedAgent, nil
}

// buildCouncilAgentEnvironment creates environment variables for council agent configuration
func (ad *AgentDeployer) buildCouncilAgentEnvironment(request *CouncilDeploymentRequest, agent council.CouncilAgent) map[string]string {
	env := map[string]string{
		// Core CHORUS configuration for council mode
		"CHORUS_AGENT_NAME":     agent.RoleName, // Maps to human-roles.yaml agent definition
		"CHORUS_COUNCIL_MODE":   "true",         // Enable council mode
		"CHORUS_COUNCIL_ID":     request.CouncilID.String(),
		"CHORUS_PROJECT_NAME":   request.ProjectContext.ProjectName,
		
		// Council prompt and context
		"CHORUS_COUNCIL_PROMPT":     "/app/prompts/council.md",
		"CHORUS_PROJECT_BRIEF":      request.ProjectContext.ProjectBrief,
		"CHORUS_CONSTRAINTS":        request.ProjectContext.Constraints,
		"CHORUS_TECH_LIMITS":        request.ProjectContext.TechLimits,
		"CHORUS_COMPLIANCE_NOTES":   request.ProjectContext.ComplianceNotes,
		"CHORUS_TARGETS":            request.ProjectContext.Targets,
		
		// Essential project context
		"CHORUS_PROJECT":       request.ProjectContext.Repository,
		"CHORUS_EXTERNAL_URL":  request.ProjectContext.ExternalURL,
		"CHORUS_PRIORITY":      "high",
		
		// WHOOSH coordination
		"WHOOSH_COORDINATOR":   "true",
		"WHOOSH_ENDPOINT":      "http://whoosh:8080",
		
		// Docker access for CHORUS sandbox management
		"DOCKER_HOST":          "unix:///var/run/docker.sock",
	}
	
	return env
}

// calculateCouncilResources determines resource requirements for council agents
func (ad *AgentDeployer) calculateCouncilResources(agent council.CouncilAgent) ResourceLimits {
	// Council agents get slightly more resources since they handle complex analysis
	return ResourceLimits{
		CPULimit:      1500000000, // 1.5 CPU cores
		MemoryLimit:   2147483648, // 2GB RAM
		CPURequest:    750000000,  // 0.75 CPU core
		MemoryRequest: 1073741824, // 1GB RAM
	}
}

// buildCouncilAgentVolumes creates volume mounts for council agents
func (ad *AgentDeployer) buildCouncilAgentVolumes(request *CouncilDeploymentRequest) []VolumeMount {
	return []VolumeMount{
		{
			Type:     "bind",
			Source:   "/var/run/docker.sock",
			Target:   "/var/run/docker.sock",
			ReadOnly: false, // Council agents need Docker access for complex setup
		},
		{
			Type:   "volume",
			Source: fmt.Sprintf("whoosh-council-%s", request.CouncilID.String()),
			Target: "/workspace",
			ReadOnly: false,
		},
		{
			Type:     "bind",
			Source:   "/rust/containers/WHOOSH/prompts",
			Target:   "/app/prompts",
			ReadOnly: true, // Mount council prompts
		},
	}
}

// buildCouncilAgentPlacement creates placement constraints for council agents
func (ad *AgentDeployer) buildCouncilAgentPlacement(agent council.CouncilAgent) PlacementConfig {
	return PlacementConfig{
		Constraints: []string{
			"node.role==worker", // Prefer worker nodes for council containers
		},
	}
}

// recordCouncilAgentDeployment records council agent deployment information in the database
func (ad *AgentDeployer) recordCouncilAgentDeployment(councilID uuid.UUID, agent council.CouncilAgent, serviceID string) error {
	query := `
		UPDATE council_agents 
		SET deployed = true, status = 'active', service_id = $1, deployed_at = NOW(), updated_at = NOW()
		WHERE council_id = $2 AND agent_id = $3
	`
	
	_, err := ad.db.Exec(ad.ctx, query, serviceID, councilID, agent.AgentID)
	return err
}

// updateCouncilDeploymentStatus updates the council deployment status in the database
func (ad *AgentDeployer) updateCouncilDeploymentStatus(councilID uuid.UUID, status, message string) error {
	query := `
		UPDATE councils 
		SET status = $1, updated_at = NOW()
		WHERE id = $2
	`
	
	// Map deployment status to council status
	councilStatus := "active"
	if status == "failed" {
		councilStatus = "failed"
	} else if status == "partial" {
		councilStatus = "active" // Partial deployment still allows council to function
	}
	
	_, err := ad.db.Exec(ad.ctx, query, councilStatus, councilID)
	return err
}