package godo

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

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)
}

// 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
}

// Create 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/logs?type=%s&follow=%t", appsBasePath, appID, deploymentID, logType, follow)
	if component != "" {
		url = fmt.Sprintf("%s&component_name=%s", url, component)
	}

	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
}