package godo

import (
	"context"
	"fmt"
	"net/http"
	"time"
)

const (
	appsBasePath = "/v2/apps"
)

// AppLogType is the type of app logs.
type AppLogType string

const (
	// AppLogTypeBuild represents build logs.
	AppLogTypeBuild AppLogType = "BUILD"
	// AppLogTypeDeploy represents deploy logs.
	AppLogTypeDeploy AppLogType = "DEPLOY"
	// AppLogTypeRun represents run logs.
	AppLogTypeRun AppLogType = "RUN"
)

// AppsService is an interface for interfacing with the App Platform endpoints
// of the DigitalOcean API.
type AppsService interface {
	Create(ctx context.Context, create *AppCreateRequest) (*App, *Response, error)
	Get(ctx context.Context, appID string) (*App, *Response, error)
	List(ctx context.Context, opts *ListOptions) ([]*App, *Response, error)
	Update(ctx context.Context, appID string, update *AppUpdateRequest) (*App, *Response, error)
	Delete(ctx context.Context, appID string) (*Response, error)

	GetDeployment(ctx context.Context, appID, deploymentID string) (*Deployment, *Response, error)
	ListDeployments(ctx context.Context, appID string, opts *ListOptions) ([]*Deployment, *Response, error)
	CreateDeployment(ctx context.Context, appID string) (*Deployment, *Response, error)

	GetLogs(ctx context.Context, appID, deploymentID, component string, logType AppLogType, follow bool) (*AppLogs, *Response, error)
}

// App represents an app.
type App struct {
	ID                   string      `json:"id"`
	Spec                 *AppSpec    `json:"spec"`
	DefaultIngress       string      `json:"default_ingress"`
	CreatedAt            time.Time   `json:"created_at"`
	UpdatedAt            time.Time   `json:"updated_at,omitempty"`
	ActiveDeployment     *Deployment `json:"active_deployment,omitempty"`
	InProgressDeployment *Deployment `json:"in_progress_deployment,omitempty"`
}

// Deployment represents a deployment for an app.
type Deployment struct {
	ID          string                  `json:"id"`
	Spec        *AppSpec                `json:"spec"`
	Services    []*DeploymentService    `json:"services,omitempty"`
	Workers     []*DeploymentWorker     `json:"workers,omitempty"`
	StaticSites []*DeploymentStaticSite `json:"static_sites,omitempty"`

	Cause    string              `json:"cause"`
	Progress *DeploymentProgress `json:"progress"`

	CreatedAt time.Time `json:"created_at"`
	UpdatedAt time.Time `json:"updated_at,omitempty"`
}

// DeploymentService represents a service component in a deployment.
type DeploymentService struct {
	Name             string `json:"name,omitempty"`
	SourceCommitHash string `json:"source_commit_hash"`
}

// DeploymentWorker represents a worker component in a deployment.
type DeploymentWorker struct {
	Name             string `json:"name,omitempty"`
	SourceCommitHash string `json:"source_commit_hash"`
}

// DeploymentStaticSite represents a static site component in a deployment.
type DeploymentStaticSite struct {
	Name             string `json:"name,omitempty"`
	SourceCommitHash string `json:"source_commit_hash"`
}

// DeploymentProgress represents the total progress of a deployment.
type DeploymentProgress struct {
	PendingSteps int `json:"pending_steps"`
	RunningSteps int `json:"running_steps"`
	SuccessSteps int `json:"success_steps"`
	ErrorSteps   int `json:"error_steps"`
	TotalSteps   int `json:"total_steps"`

	Steps []*DeploymentProgressStep `json:"steps"`
}

// DeploymentProgressStep represents the progress of a deployment step.
type DeploymentProgressStep struct {
	Name      string                    `json:"name"`
	Status    string                    `json:"status"`
	Steps     []*DeploymentProgressStep `json:"steps,omitempty"`
	Attempts  uint32                    `json:"attempts"`
	StartedAt time.Time                 `json:"started_at,omitempty"`
	EndedAt   time.Time                 `json:"ended_at,omitempty"`
}

// AppLogs represent app logs.
type AppLogs struct {
	LiveURL      string   `json:"live_url"`
	HistoricURLs []string `json:"historic_urls"`
}

// AppCreateRequest represents a request to create an app.
type AppCreateRequest struct {
	Spec *AppSpec `json:"spec"`
}

// AppUpdateRequest represents a request to update an app.
type AppUpdateRequest struct {
	Spec *AppSpec `json:"spec"`
}

type appRoot struct {
	App *App `json:"app"`
}

type appsRoot struct {
	Apps []*App `json:"apps"`
}

type deploymentRoot struct {
	Deployment *Deployment `json:"deployment"`
}

type deploymentsRoot struct {
	Deployments []*Deployment `json:"deployments"`
}

// AppsServiceOp handles communication with Apps methods of the DigitalOcean API.
type AppsServiceOp struct {
	client *Client
}

// Creates an app.
func (s *AppsServiceOp) Create(ctx context.Context, create *AppCreateRequest) (*App, *Response, error) {
	path := appsBasePath
	req, err := s.client.NewRequest(ctx, http.MethodPost, path, create)
	if err != nil {
		return nil, nil, err
	}

	root := new(appRoot)
	resp, err := s.client.Do(ctx, req, root)
	if err != nil {
		return nil, resp, err
	}
	return root.App, resp, nil
}

// Get an app.
func (s *AppsServiceOp) Get(ctx context.Context, appID string) (*App, *Response, error) {
	path := fmt.Sprintf("%s/%s", appsBasePath, appID)
	req, err := s.client.NewRequest(ctx, http.MethodGet, path, nil)
	if err != nil {
		return nil, nil, err
	}
	root := new(appRoot)
	resp, err := s.client.Do(ctx, req, root)
	if err != nil {
		return nil, resp, err
	}
	return root.App, resp, nil
}

// List apps.
func (s *AppsServiceOp) List(ctx context.Context, opts *ListOptions) ([]*App, *Response, error) {
	path := appsBasePath
	req, err := s.client.NewRequest(ctx, http.MethodGet, path, nil)
	if err != nil {
		return nil, nil, err
	}
	root := new(appsRoot)
	resp, err := s.client.Do(ctx, req, root)
	if err != nil {
		return nil, resp, err
	}
	return root.Apps, resp, nil
}

// Update an app.
func (s *AppsServiceOp) Update(ctx context.Context, appID string, update *AppUpdateRequest) (*App, *Response, error) {
	path := fmt.Sprintf("%s/%s", appsBasePath, appID)
	req, err := s.client.NewRequest(ctx, http.MethodPut, path, update)
	if err != nil {
		return nil, nil, err
	}

	root := new(appRoot)
	resp, err := s.client.Do(ctx, req, root)
	if err != nil {
		return nil, resp, err
	}
	return root.App, resp, nil
}

// Delete an app.
func (s *AppsServiceOp) Delete(ctx context.Context, appID string) (*Response, error) {
	path := fmt.Sprintf("%s/%s", appsBasePath, appID)
	req, err := s.client.NewRequest(ctx, http.MethodDelete, path, nil)
	if err != nil {
		return nil, err
	}
	resp, err := s.client.Do(ctx, req, nil)
	if err != nil {
		return resp, err
	}
	return resp, nil
}

// GetDeployment gets an app deployment.
func (s *AppsServiceOp) GetDeployment(ctx context.Context, appID, deploymentID string) (*Deployment, *Response, error) {
	path := fmt.Sprintf("%s/%s/deployments/%s", appsBasePath, appID, deploymentID)
	req, err := s.client.NewRequest(ctx, http.MethodGet, path, nil)
	if err != nil {
		return nil, nil, err
	}
	root := new(deploymentRoot)
	resp, err := s.client.Do(ctx, req, root)
	if err != nil {
		return nil, resp, err
	}
	return root.Deployment, resp, nil
}

// ListDeployments lists an app deployments.
func (s *AppsServiceOp) ListDeployments(ctx context.Context, appID string, opts *ListOptions) ([]*Deployment, *Response, error) {
	path := fmt.Sprintf("%s/%s/deployments", appsBasePath, appID)
	req, err := s.client.NewRequest(ctx, http.MethodGet, path, nil)
	if err != nil {
		return nil, nil, err
	}
	root := new(deploymentsRoot)
	resp, err := s.client.Do(ctx, req, root)
	if err != nil {
		return nil, resp, err
	}
	return root.Deployments, resp, nil
}

// CreateDeployment creates an app deployment.
func (s *AppsServiceOp) CreateDeployment(ctx context.Context, appID string) (*Deployment, *Response, error) {
	path := fmt.Sprintf("%s/%s/deployments", appsBasePath, appID)
	req, err := s.client.NewRequest(ctx, http.MethodPost, path, nil)
	if err != nil {
		return nil, nil, err
	}
	root := new(deploymentRoot)
	resp, err := s.client.Do(ctx, req, root)
	if err != nil {
		return nil, resp, err
	}
	return root.Deployment, resp, nil
}

// GetLogs retrieves app logs.
func (s *AppsServiceOp) GetLogs(ctx context.Context, appID, deploymentID, component string, logType AppLogType, follow bool) (*AppLogs, *Response, error) {
	url := fmt.Sprintf("%s/%s/deployments/%s/components/%s/logs?type=%s&follow=%t", appsBasePath, appID, deploymentID, component, logType, follow)
	req, err := s.client.NewRequest(ctx, http.MethodGet, url, nil)
	if err != nil {
		return nil, nil, err
	}
	logs := new(AppLogs)
	resp, err := s.client.Do(ctx, req, logs)
	if err != nil {
		return nil, resp, err
	}
	return logs, resp, nil
}