package client

import (
	"context"
	"fmt"

	"git.schultes.dev/schultesdev/prefect-go/pkg/models"
	"git.schultes.dev/schultesdev/prefect-go/pkg/pagination"
	"github.com/google/uuid"
)

// DeploymentsService handles operations related to deployments.
type DeploymentsService struct {
	client *Client
}

// Create creates a new deployment.
func (s *DeploymentsService) Create(ctx context.Context, req *models.DeploymentCreate) (*models.Deployment, error) {
	var deployment models.Deployment
	if err := s.client.post(ctx, "/deployments/", req, &deployment); err != nil {
		return nil, fmt.Errorf("failed to create deployment: %w", err)
	}
	return &deployment, nil
}

// Get retrieves a deployment by ID.
func (s *DeploymentsService) Get(ctx context.Context, id uuid.UUID) (*models.Deployment, error) {
	var deployment models.Deployment
	path := joinPath("/deployments", id.String())
	if err := s.client.get(ctx, path, &deployment); err != nil {
		return nil, fmt.Errorf("failed to get deployment: %w", err)
	}
	return &deployment, nil
}

// GetByName retrieves a deployment by flow name and deployment name.
func (s *DeploymentsService) GetByName(ctx context.Context, flowName, deploymentName string) (*models.Deployment, error) {
	var deployment models.Deployment
	path := fmt.Sprintf("/deployments/name/%s/%s", flowName, deploymentName)
	if err := s.client.get(ctx, path, &deployment); err != nil {
		return nil, fmt.Errorf("failed to get deployment by name: %w", err)
	}
	return &deployment, nil
}

// Update updates a deployment.
func (s *DeploymentsService) Update(ctx context.Context, id uuid.UUID, req *models.DeploymentUpdate) (*models.Deployment, error) {
	var deployment models.Deployment
	path := joinPath("/deployments", id.String())
	if err := s.client.patch(ctx, path, req, &deployment); err != nil {
		return nil, fmt.Errorf("failed to update deployment: %w", err)
	}
	return &deployment, nil
}

// Delete deletes a deployment by ID.
func (s *DeploymentsService) Delete(ctx context.Context, id uuid.UUID) error {
	path := joinPath("/deployments", id.String())
	if err := s.client.delete(ctx, path); err != nil {
		return fmt.Errorf("failed to delete deployment: %w", err)
	}
	return nil
}

// Pause pauses a deployment's schedule.
func (s *DeploymentsService) Pause(ctx context.Context, id uuid.UUID) error {
	path := joinPath("/deployments", id.String(), "pause")
	if err := s.client.post(ctx, path, nil, nil); err != nil {
		return fmt.Errorf("failed to pause deployment: %w", err)
	}
	return nil
}

// Resume resumes a deployment's schedule.
func (s *DeploymentsService) Resume(ctx context.Context, id uuid.UUID) error {
	path := joinPath("/deployments", id.String(), "resume")
	if err := s.client.post(ctx, path, nil, nil); err != nil {
		return fmt.Errorf("failed to resume deployment: %w", err)
	}
	return nil
}

// CreateFlowRun creates a flow run from a deployment.
func (s *DeploymentsService) CreateFlowRun(ctx context.Context, id uuid.UUID, params map[string]interface{}) (*models.FlowRun, error) {
	var flowRun models.FlowRun
	path := joinPath("/deployments", id.String(), "create_flow_run")

	req := struct {
		Parameters map[string]interface{} `json:"parameters,omitempty"`
	}{
		Parameters: params,
	}

	if err := s.client.post(ctx, path, req, &flowRun); err != nil {
		return nil, fmt.Errorf("failed to create flow run from deployment: %w", err)
	}
	return &flowRun, nil
}

// List retrieves a list of deployments with optional filtering.
func (s *DeploymentsService) List(ctx context.Context, filter *models.DeploymentFilter, offset, limit int) (*pagination.PaginatedResponse[models.Deployment], error) {
	if filter == nil {
		filter = &models.DeploymentFilter{}
	}
	filter.Offset = offset
	filter.Limit = limit

	type response struct {
		Results []models.Deployment `json:"results"`
		Count   int                 `json:"count"`
	}

	var resp response
	if err := s.client.post(ctx, "/deployments/filter", filter, &resp); err != nil {
		return nil, fmt.Errorf("failed to list deployments: %w", err)
	}

	return &pagination.PaginatedResponse[models.Deployment]{
		Results: resp.Results,
		Count:   resp.Count,
		Limit:   limit,
		Offset:  offset,
		HasMore: offset+len(resp.Results) < resp.Count,
	}, nil
}

// ListAll returns an iterator for all deployments matching the filter.
func (s *DeploymentsService) ListAll(ctx context.Context, filter *models.DeploymentFilter) *pagination.Iterator[models.Deployment] {
	fetchFunc := func(ctx context.Context, offset, limit int) (*pagination.PaginatedResponse[models.Deployment], error) {
		return s.List(ctx, filter, offset, limit)
	}
	return pagination.NewIterator(fetchFunc, 100)
}

// Count returns the number of deployments matching the filter.
func (s *DeploymentsService) Count(ctx context.Context, filter *models.DeploymentFilter) (int, error) {
	if filter == nil {
		filter = &models.DeploymentFilter{}
	}

	var count int
	if err := s.client.post(ctx, "/deployments/count", filter, &count); err != nil {
		return 0, fmt.Errorf("failed to count deployments: %w", err)
	}
	return count, nil
}

// GetSchedules retrieves all schedules for a deployment.
func (s *DeploymentsService) GetSchedules(ctx context.Context, id uuid.UUID) ([]models.DeploymentSchedule, error) {
	var schedules []models.DeploymentSchedule
	path := joinPath("/deployments", id.String(), "schedules")
	if err := s.client.get(ctx, path, &schedules); err != nil {
		return nil, fmt.Errorf("failed to get deployment schedules: %w", err)
	}
	return schedules, nil
}

// CreateSchedules creates schedules for a deployment.
func (s *DeploymentsService) CreateSchedules(ctx context.Context, id uuid.UUID, schedules []models.DeploymentScheduleCreate) ([]models.DeploymentSchedule, error) {
	var result []models.DeploymentSchedule
	path := joinPath("/deployments", id.String(), "schedules")
	if err := s.client.post(ctx, path, schedules, &result); err != nil {
		return nil, fmt.Errorf("failed to create deployment schedules: %w", err)
	}
	return result, nil
}

// UpdateSchedule updates a specific schedule for a deployment.
func (s *DeploymentsService) UpdateSchedule(ctx context.Context, deploymentID, scheduleID uuid.UUID, req *models.DeploymentScheduleUpdate) error {
	path := joinPath("/deployments", deploymentID.String(), "schedules", scheduleID.String())
	if err := s.client.patch(ctx, path, req, nil); err != nil {
		return fmt.Errorf("failed to update deployment schedule: %w", err)
	}
	return nil
}

// DeleteSchedule deletes a specific schedule from a deployment.
func (s *DeploymentsService) DeleteSchedule(ctx context.Context, deploymentID, scheduleID uuid.UUID) error {
	path := joinPath("/deployments", deploymentID.String(), "schedules", scheduleID.String())
	if err := s.client.delete(ctx, path); err != nil {
		return fmt.Errorf("failed to delete deployment schedule: %w", err)
	}
	return nil
}

// TaskRunsService handles operations related to task runs.
type TaskRunsService struct {
	client *Client
}

// Create creates a new task run.
func (t *TaskRunsService) Create(ctx context.Context, req *models.TaskRunCreate) (*models.TaskRun, error) {
	var taskRun models.TaskRun
	if err := t.client.post(ctx, "/task_runs/", req, &taskRun); err != nil {
		return nil, fmt.Errorf("failed to create task run: %w", err)
	}
	return &taskRun, nil
}

// Get retrieves a task run by ID.
func (t *TaskRunsService) Get(ctx context.Context, id uuid.UUID) (*models.TaskRun, error) {
	var taskRun models.TaskRun
	path := joinPath("/task_runs", id.String())
	if err := t.client.get(ctx, path, &taskRun); err != nil {
		return nil, fmt.Errorf("failed to get task run: %w", err)
	}
	return &taskRun, nil
}

// Delete deletes a task run by ID.
func (t *TaskRunsService) Delete(ctx context.Context, id uuid.UUID) error {
	path := joinPath("/task_runs", id.String())
	if err := t.client.delete(ctx, path); err != nil {
		return fmt.Errorf("failed to delete task run: %w", err)
	}
	return nil
}

// SetState sets the state of a task run.
func (t *TaskRunsService) SetState(ctx context.Context, id uuid.UUID, state *models.StateCreate) (*models.TaskRun, error) {
	var taskRun models.TaskRun
	path := joinPath("/task_runs", id.String(), "set_state")

	req := struct {
		State *models.StateCreate `json:"state"`
	}{
		State: state,
	}

	if err := t.client.post(ctx, path, req, &taskRun); err != nil {
		return nil, fmt.Errorf("failed to set task run state: %w", err)
	}
	return &taskRun, nil
}

// Update updates a task run.
func (t *TaskRunsService) Update(ctx context.Context, id uuid.UUID, req *models.TaskRunUpdate) (*models.TaskRun, error) {
	var taskRun models.TaskRun
	path := joinPath("/task_runs", id.String())
	if err := t.client.patch(ctx, path, req, &taskRun); err != nil {
		return nil, fmt.Errorf("failed to update task run: %w", err)
	}
	return &taskRun, nil
}

// List retrieves a list of task runs with optional filtering.
func (t *TaskRunsService) List(ctx context.Context, filter *models.TaskRunFilter, offset, limit int) (*pagination.PaginatedResponse[models.TaskRun], error) {
	if filter == nil {
		filter = &models.TaskRunFilter{}
	}
	filter.Offset = offset
	filter.Limit = limit

	type response struct {
		Results []models.TaskRun `json:"results"`
		Count   int              `json:"count"`
	}

	var resp response
	if err := t.client.post(ctx, "/task_runs/filter", filter, &resp); err != nil {
		return nil, fmt.Errorf("failed to list task runs: %w", err)
	}

	return &pagination.PaginatedResponse[models.TaskRun]{
		Results: resp.Results,
		Count:   resp.Count,
		Limit:   limit,
		Offset:  offset,
		HasMore: offset+len(resp.Results) < resp.Count,
	}, nil
}

// ListAll returns an iterator for all task runs matching the filter.
func (t *TaskRunsService) ListAll(ctx context.Context, filter *models.TaskRunFilter) *pagination.Iterator[models.TaskRun] {
	fetchFunc := func(ctx context.Context, offset, limit int) (*pagination.PaginatedResponse[models.TaskRun], error) {
		return t.List(ctx, filter, offset, limit)
	}
	return pagination.NewIterator(fetchFunc, 100)
}

// Count returns the number of task runs matching the filter.
func (t *TaskRunsService) Count(ctx context.Context, filter *models.TaskRunFilter) (int, error) {
	if filter == nil {
		filter = &models.TaskRunFilter{}
	}

	var count int
	if err := t.client.post(ctx, "/task_runs/count", filter, &count); err != nil {
		return 0, fmt.Errorf("failed to count task runs: %w", err)
	}
	return count, nil
}

// WorkPoolsService handles operations related to work pools.
type WorkPoolsService struct {
	client *Client
}

// Get retrieves a work pool by name.
func (w *WorkPoolsService) Get(ctx context.Context, name string) (*models.WorkPool, error) {
	var workPool models.WorkPool
	path := joinPath("/work_pools", name)
	if err := w.client.get(ctx, path, &workPool); err != nil {
		return nil, fmt.Errorf("failed to get work pool: %w", err)
	}
	return &workPool, nil
}

// Create creates a new work pool.
func (w *WorkPoolsService) Create(ctx context.Context, req *models.WorkPoolCreate) (*models.WorkPool, error) {
	var workPool models.WorkPool
	if err := w.client.post(ctx, "/work_pools/", req, &workPool); err != nil {
		return nil, fmt.Errorf("failed to create work pool: %w", err)
	}
	return &workPool, nil
}

// Update updates a work pool.
func (w *WorkPoolsService) Update(ctx context.Context, name string, req *models.WorkPoolUpdate) error {
	path := joinPath("/work_pools", name)
	if err := w.client.patch(ctx, path, req, nil); err != nil {
		return fmt.Errorf("failed to update work pool: %w", err)
	}
	return nil
}

// Delete deletes a work pool by name.
func (w *WorkPoolsService) Delete(ctx context.Context, name string) error {
	path := joinPath("/work_pools", name)
	if err := w.client.delete(ctx, path); err != nil {
		return fmt.Errorf("failed to delete work pool: %w", err)
	}
	return nil
}

// List retrieves work pools with optional filtering.
func (w *WorkPoolsService) List(ctx context.Context, filter *models.WorkPoolFilter, offset, limit int) ([]models.WorkPool, error) {
	if filter == nil {
		filter = &models.WorkPoolFilter{}
	}
	filter.Offset = offset
	filter.Limit = limit

	var workPools []models.WorkPool
	if err := w.client.post(ctx, "/work_pools/filter", filter, &workPools); err != nil {
		return nil, fmt.Errorf("failed to list work pools: %w", err)
	}
	return workPools, nil
}

// Count returns the number of work pools matching the filter.
func (w *WorkPoolsService) Count(ctx context.Context, filter *models.WorkPoolFilter) (int, error) {
	if filter == nil {
		filter = &models.WorkPoolFilter{}
	}

	var count int
	if err := w.client.post(ctx, "/work_pools/count", filter, &count); err != nil {
		return 0, fmt.Errorf("failed to count work pools: %w", err)
	}
	return count, nil
}

// WorkQueuesService handles operations related to work queues.
type WorkQueuesService struct {
	client *Client
}

// Get retrieves a work queue by ID.
func (w *WorkQueuesService) Get(ctx context.Context, id uuid.UUID) (*models.WorkQueue, error) {
	var workQueue models.WorkQueue
	path := joinPath("/work_queues", id.String())
	if err := w.client.get(ctx, path, &workQueue); err != nil {
		return nil, fmt.Errorf("failed to get work queue: %w", err)
	}
	return &workQueue, nil
}

// Create creates a new work queue.
func (w *WorkQueuesService) Create(ctx context.Context, req *models.WorkQueueCreate) (*models.WorkQueue, error) {
	var workQueue models.WorkQueue
	if err := w.client.post(ctx, "/work_queues/", req, &workQueue); err != nil {
		return nil, fmt.Errorf("failed to create work queue: %w", err)
	}
	return &workQueue, nil
}

// GetByName retrieves a work queue by name.
func (w *WorkQueuesService) GetByName(ctx context.Context, name string) (*models.WorkQueue, error) {
	var workQueue models.WorkQueue
	path := joinPath("/work_queues/name", name)
	if err := w.client.get(ctx, path, &workQueue); err != nil {
		return nil, fmt.Errorf("failed to get work queue by name: %w", err)
	}
	return &workQueue, nil
}

// Update updates a work queue.
func (w *WorkQueuesService) Update(ctx context.Context, id uuid.UUID, req *models.WorkQueueUpdate) error {
	path := joinPath("/work_queues", id.String())
	if err := w.client.patch(ctx, path, req, nil); err != nil {
		return fmt.Errorf("failed to update work queue: %w", err)
	}
	return nil
}

// Delete deletes a work queue by ID.
func (w *WorkQueuesService) Delete(ctx context.Context, id uuid.UUID) error {
	path := joinPath("/work_queues", id.String())
	if err := w.client.delete(ctx, path); err != nil {
		return fmt.Errorf("failed to delete work queue: %w", err)
	}
	return nil
}

// List retrieves work queues with optional filtering.
func (w *WorkQueuesService) List(ctx context.Context, filter *models.WorkQueueFilter, offset, limit int) ([]models.WorkQueue, error) {
	if filter == nil {
		filter = &models.WorkQueueFilter{}
	}
	filter.Offset = offset
	filter.Limit = limit

	var workQueues []models.WorkQueue
	if err := w.client.post(ctx, "/work_queues/filter", filter, &workQueues); err != nil {
		return nil, fmt.Errorf("failed to list work queues: %w", err)
	}
	return workQueues, nil
}

// VariablesService handles operations related to variables.
type VariablesService struct {
	client *Client
}

// Create creates a new variable.
func (v *VariablesService) Create(ctx context.Context, req *models.VariableCreate) (*models.Variable, error) {
	var variable models.Variable
	if err := v.client.post(ctx, "/variables/", req, &variable); err != nil {
		return nil, fmt.Errorf("failed to create variable: %w", err)
	}
	return &variable, nil
}

// Get retrieves a variable by ID.
func (v *VariablesService) Get(ctx context.Context, id uuid.UUID) (*models.Variable, error) {
	var variable models.Variable
	path := joinPath("/variables", id.String())
	if err := v.client.get(ctx, path, &variable); err != nil {
		return nil, fmt.Errorf("failed to get variable: %w", err)
	}
	return &variable, nil
}

// GetByName retrieves a variable by name.
func (v *VariablesService) GetByName(ctx context.Context, name string) (*models.Variable, error) {
	var variable models.Variable
	path := joinPath("/variables/name", name)
	if err := v.client.get(ctx, path, &variable); err != nil {
		return nil, fmt.Errorf("failed to get variable by name: %w", err)
	}
	return &variable, nil
}

// Update updates a variable.
func (v *VariablesService) Update(ctx context.Context, id uuid.UUID, req *models.VariableUpdate) (*models.Variable, error) {
	var variable models.Variable
	path := joinPath("/variables", id.String())
	if err := v.client.patch(ctx, path, req, &variable); err != nil {
		return nil, fmt.Errorf("failed to update variable: %w", err)
	}
	return &variable, nil
}

// Delete deletes a variable by ID.
func (v *VariablesService) Delete(ctx context.Context, id uuid.UUID) error {
	path := joinPath("/variables", id.String())
	if err := v.client.delete(ctx, path); err != nil {
		return fmt.Errorf("failed to delete variable: %w", err)
	}
	return nil
}

// List retrieves a list of variables with optional filtering.
func (v *VariablesService) List(ctx context.Context, filter *models.VariableFilter, offset, limit int) (*pagination.PaginatedResponse[models.Variable], error) {
	if filter == nil {
		filter = &models.VariableFilter{}
	}
	filter.Offset = offset
	filter.Limit = limit

	type response struct {
		Results []models.Variable `json:"results"`
		Count   int               `json:"count"`
	}

	var resp response
	if err := v.client.post(ctx, "/variables/filter", filter, &resp); err != nil {
		return nil, fmt.Errorf("failed to list variables: %w", err)
	}

	return &pagination.PaginatedResponse[models.Variable]{
		Results: resp.Results,
		Count:   resp.Count,
		Limit:   limit,
		Offset:  offset,
		HasMore: offset+len(resp.Results) < resp.Count,
	}, nil
}

// ListAll returns an iterator for all variables matching the filter.
func (v *VariablesService) ListAll(ctx context.Context, filter *models.VariableFilter) *pagination.Iterator[models.Variable] {
	fetchFunc := func(ctx context.Context, offset, limit int) (*pagination.PaginatedResponse[models.Variable], error) {
		return v.List(ctx, filter, offset, limit)
	}
	return pagination.NewIterator(fetchFunc, 100)
}

// Count returns the number of variables matching the filter.
func (v *VariablesService) Count(ctx context.Context, filter *models.VariableFilter) (int, error) {
	if filter == nil {
		filter = &models.VariableFilter{}
	}

	var count int
	if err := v.client.post(ctx, "/variables/count", filter, &count); err != nil {
		return 0, fmt.Errorf("failed to count variables: %w", err)
	}
	return count, nil
}

// LogsService handles operations related to logs.
type LogsService struct {
	client *Client
}

// Create creates new log entries.
func (l *LogsService) Create(ctx context.Context, logs []*models.LogCreate) error {
	if err := l.client.post(ctx, "/logs/", logs, nil); err != nil {
		return fmt.Errorf("failed to create logs: %w", err)
	}
	return nil
}

// List retrieves logs with filtering.
func (l *LogsService) List(ctx context.Context, filter interface{}, offset, limit int) (*pagination.PaginatedResponse[models.Log], error) {
	type request struct {
		Filter interface{} `json:"filter,omitempty"`
		Offset int         `json:"offset"`
		Limit  int         `json:"limit"`
	}

	req := request{
		Filter: filter,
		Offset: offset,
		Limit:  limit,
	}

	type response struct {
		Results []models.Log `json:"results"`
		Count   int          `json:"count"`
	}

	var resp response
	if err := l.client.post(ctx, "/logs/filter", req, &resp); err != nil {
		return nil, fmt.Errorf("failed to list logs: %w", err)
	}

	return &pagination.PaginatedResponse[models.Log]{
		Results: resp.Results,
		Count:   resp.Count,
		Limit:   limit,
		Offset:  offset,
		HasMore: offset+len(resp.Results) < resp.Count,
	}, nil
}

// AdminService handles administrative operations.
type AdminService struct {
	client *Client
}

// Health checks the health of the Prefect server.
func (a *AdminService) Health(ctx context.Context) error {
	if err := a.client.get(ctx, "/health", nil); err != nil {
		return fmt.Errorf("health check failed: %w", err)
	}
	return nil
}

// Version retrieves the server version.
func (a *AdminService) Version(ctx context.Context) (string, error) {
	var result struct {
		Version string `json:"version"`
	}
	if err := a.client.get(ctx, "/version", &result); err != nil {
		return "", fmt.Errorf("failed to get version: %w", err)
	}
	return result.Version, nil
}