package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"

	"github.com/labstack/echo"
	"github.com/rosti-cz/node-api/apps"
	"github.com/rosti-cz/node-api/docker"
	"github.com/rosti-cz/node-api/node"
)

func homeHandler(c echo.Context) error {
	return c.Render(http.StatusOK, "index.html", templateData{
		Token: config.Token,
	})
}

func listAppsHandler(c echo.Context) error {
	err := gatherStates()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	applications, err := apps.List()

	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, applications)
}

// Returns one app
func getAppHandler(c echo.Context) error {
	name := c.Param("name")

	err := updateState(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, app)
}

// Create a new app
// If you add register_only=1 into query string, it won't start or create any container, just adds record into the database.
func createAppHandler(c echo.Context) error {
	registerOnly := c.QueryParam("register_only") == "1"

	app := apps.App{}
	err := c.Bind(&app)
	if err != nil {
		return c.JSONPretty(http.StatusBadRequest, Message{Message: err.Error()}, JSONIndent)
	}

	err = apps.New(app.Name, app.SSHPort, app.HTTPPort, app.Image, app.CPU, app.Memory)
	if err != nil {
		if validationError, ok := err.(apps.ValidationError); ok {
			return c.JSONPretty(http.StatusBadRequest, Message{Errors: validationError.Errors}, JSONIndent)
		}
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	if !registerOnly {
		container := docker.Container{
			App: &app,
		}

		err = container.Create()
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}

		err = container.Start()
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Update existing app
func updateAppHandler(c echo.Context) error {
	name := c.Param("name")

	app := apps.App{}
	err := c.Bind(&app)
	if err != nil {
		return c.JSONPretty(http.StatusBadRequest, Message{Message: err.Error()}, JSONIndent)
	}

	appPointer, err := apps.Update(name, app.SSHPort, app.HTTPPort, app.Image, app.CPU, app.Memory)
	if err != nil {
		if validationError, ok := err.(apps.ValidationError); ok {
			return c.JSONPretty(http.StatusBadRequest, Message{Errors: validationError.Errors}, JSONIndent)
		}
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	app = *appPointer

	container := docker.Container{
		App: &app,
	}

	err = container.Destroy()
	if err != nil && err.Error() == "no container found" {
		// We don't care if the container didn't exist anyway
		err = nil
	}
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	err = container.Create()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	err = container.Start()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Stop existing app
func stopAppHandler(c echo.Context) error {
	name := c.Param("name")

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	container := docker.Container{
		App: app,
	}

	status, err := container.Status()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	// Stop the container only when it exists
	if status != "no-container" {
		err = container.Stop()
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Start existing app
func startAppHandler(c echo.Context) error {
	name := c.Param("name")

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	container := docker.Container{
		App: app,
	}

	status, err := container.Status()
	if err != nil {
		return err
	}
	if status == "no-container" {
		err = container.Create()
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	err = container.Start()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Stop existing app
func restartAppHandler(c echo.Context) error {
	name := c.Param("name")

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	container := docker.Container{
		App: app,
	}

	err = container.Restart()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Set password for the app user in the container
func setPasswordHandler(c echo.Context) error {
	name := c.Param("name")

	password := Password{}
	err := c.Bind(&password)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	container := docker.Container{
		App: app,
	}

	err = container.SetPassword(password.Password)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Copies body of the request into /srv/.ssh/authorized_keys
func setKeysHandler(c echo.Context) error {
	name := c.Param("name")

	body, err := ioutil.ReadAll(c.Request().Body)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	container := docker.Container{
		App: app,
	}

	err = container.SetFileContent(sshPubKeysLocation, string(body)+"\n", "0600")
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

func setServicesHandler(c echo.Context) error {
	name := c.Param("name")

	quickServices := &QuickServices{}
	err := c.Bind(quickServices)
	if err != nil {
		return c.JSONPretty(http.StatusBadRequest, Message{Message: err.Error()}, JSONIndent)
	}

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	container := docker.Container{
		App: app,
	}

	if quickServices.Python {
		err = container.SetTechnology("python")
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	if quickServices.PHP {
		err = container.SetTechnology("php")
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	if quickServices.Node {
		err = container.SetTechnology("node")
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	if quickServices.Ruby {
		err = container.SetTechnology("ruby")
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	if quickServices.Deno {
		err = container.SetTechnology("deno")
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	if quickServices.Memcached {
		err = container.SetTechnology("memcached")
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	if quickServices.Redis {
		err = container.SetTechnology("redis")
		if err != nil {
			return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
		}
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Rebuilds existing app, it keeps the data but created the container again
func rebuildAppHandler(c echo.Context) error {
	name := c.Param("name")

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	container := docker.Container{
		App: app,
	}

	err = container.Destroy()
	if err != nil && err.Error() == "no container found" {
		// We don't care if the container didn't exist anyway
		err = nil
	}
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	err = container.Create()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	err = container.Start()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Adds new label
func addLabelHandler(c echo.Context) error {
	name := c.Param("name")
	label := apps.Label{}

	err := c.Bind(&label)
	if err != nil {
		return c.JSONPretty(http.StatusBadRequest, Message{Message: err.Error()}, JSONIndent)
	}

	err = apps.AddLabel(name, label.Value)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Removes existing label
func deleteLabelHandler(c echo.Context) error {
	name := c.Param("name")
	label := apps.Label{}

	err := c.Bind(&label)
	if err != nil {
		return c.JSONPretty(http.StatusBadRequest, Message{Message: err.Error()}, JSONIndent)
	}

	err = apps.RemoveLabel(name, label.Value)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, Message{Message: "ok"})
}

// Delete one app
// This is async function.
func deleteAppHandler(c echo.Context) error {
	name := c.Param("name")

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	go func(app *apps.App) {
		container := docker.Container{
			App: app,
		}

		status, err := container.Status()
		if err != nil {
			log.Println("ERROR delete application problem: " + err.Error())

		}
		if status != "no-container" {
			err = container.Delete()
			if err != nil {
				log.Println("ERROR delete application problem: " + err.Error())
			}
		}

		err = apps.Delete(app.Name)
		if err != nil {
			log.Println("ERROR delete application problem: " + err.Error())
		}
	}(app)

	return c.JSON(http.StatusOK, Message{Message: "deleted"})
}

// Orphans returns directories in /srv that doesn't match any hosted application
func getOrphansHander(c echo.Context) error {
	return c.JSON(http.StatusOK, []string{})
}

// Return info about the node including performance index
func getNodeInfoHandler(c echo.Context) error {
	node, err := node.GetNodeInfo()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, node)
}

// Returns list of running processes (inside supervisor)
func getAppProcessesHandler(c echo.Context) error {
	name := c.Param("name")

	app, err := apps.Get(name)
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	container := docker.Container{
		App: app,
	}

	processes, err := container.GetProcessList()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	return c.JSON(http.StatusOK, processes)
}

// Return metrics that are available for running node
func metricsHandler(c echo.Context) error {
	var metrics string

	// Node indexes
	node, err := node.GetNodeInfo()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	hostname, err := os.Hostname()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	metrics += fmt.Sprintf("rosti_node_index{hostname=\"%s\"} %f\n", hostname, node.Index)
	metrics += fmt.Sprintf("rosti_node_disk_space_index{hostname=\"%s\"} %f\n", hostname, node.DiskSpaceIndex)
	metrics += fmt.Sprintf("rosti_node_load1_index{hostname=\"%s\"} %f\n", hostname, node.Load1Index)
	metrics += fmt.Sprintf("rosti_node_load5_index{hostname=\"%s\"} %f\n", hostname, node.Load5Index)
	metrics += fmt.Sprintf("rosti_node_load15_index{hostname=\"%s\"} %f\n", hostname, node.Load15Index)
	metrics += fmt.Sprintf("rosti_node_memory_index{hostname=\"%s\"} %f\n", hostname, node.MemoryIndex)
	metrics += fmt.Sprintf("rosti_node_sold_memory{hostname=\"%s\"} %d\n", hostname, node.SoldMemory)

	apps, err := apps.List()
	if err != nil {
		return c.JSONPretty(http.StatusInternalServerError, Message{Message: err.Error()}, JSONIndent)
	}

	for _, app := range *apps {
		metrics += fmt.Sprintf("rosti_node_app_disk_usage_bytes{hostname=\"%s\", app=\"%s\"} %d\n", hostname, app.Name, app.DiskUsageBytes)
		metrics += fmt.Sprintf("rosti_node_app_disk_usage_inodes{hostname=\"%s\", app=\"%s\"} %d\n", hostname, app.Name, app.DiskUsageInodes)
	}

	return c.String(http.StatusOK, metrics)
}