package main

import (
	"context"
	"fmt"
	"maunium.net/go/mautrix/event"
)

var Chatcommands = []MatrixCommand{}

// getSitesByString is a helper function for chat commands.
// If text is "all" it will get all sites. If text is a specific site name it will get that site.
// Returns a list of strings that are textual representations of errors.
func getSitesByString(text string) ([]Site, []string) {
	errors := []string{} // errors holds any errors we encounter in this function
	sites := []Site{}    // sites holds every site we need
	// Determine which sites to get
	if text == "all" { // If we need to get all sites, (!restart all)
		var err error
		sites, err = getAllSites() // Get all sites
		if err != nil {            // Check for errors
			errors = append(errors, "Failed to get all sites!")
		}
	} else { // If we need to get a specific site, (!restart LapisDeploy-TestApp)
		site, found, err := getSite(text) // (Attempt to) get that site.
		// Check if something went wrong (site doesn't exist, error occured)
		if err != nil { // Error occured.
			errors = append(errors, "Failed to get site "+text+"!")
		} else if !found { // Site doesn't exist.
			errors = append(errors, "Invalid site.")
		}
		sites = append(sites, site) // Add this site to the list of sites needed
	}
	return sites, errors
}

func registerChatCommands() {
	Chatcommands = []MatrixCommand{
		{
			cmd:         "help",
			description: "Show the help dialouge",
			callback: func(ctx context.Context, evt *event.Event, args []string) string {
				text := ""
				for _, cmd := range Chatcommands {
					text = fmt.Sprintf("%s- %s\n	%s\n", text, cmd.cmd, cmd.description)
				}
				return text
			},
		},
		{
			cmd:         "sites",
			description: "Display all available sites",
			callback: func(ctx context.Context, evt *event.Event, args []string) string {
				text := Circles["white"] + "Getting sites...\n"
				sites, err := getAllSites()
				if err != nil {
					return text + Circles["red"] + "Failed to get sites!"
				}
				for _, site := range sites {
					text = fmt.Sprintf("%s%s", text, site.getName())
					if site.config.name != "" { // Only add technical name to sites with a configured name.
						text += " (" + site.name + ")"
					}
					text += "\n"
				}
				if len(sites) == 0 {
					text = text + "*No sites found*"
				}
				return text
			},
		},
		{
			cmd:         "restart",
			description: "Restart either a specific site, or all sites.",
			callback: func(ctx context.Context, evt *event.Event, args []string) string {
				if len(args) < 2 { // If no arguments were given
					return Circles["red"] + "Invalid site."
				}
				sites, errors := getSitesByString(args[1])
				text := "" // text contains the entire message that will be sent.
				for _, error := range errors {
					text += Circles["red"] + error + "\n"
				}
				for _, site := range sites { // For every site queued to be restarted,
					if err := site.Restart(); err != nil { // Attempt to restart it
						text += fmt.Sprintf("%sRestarting '%s'... failed!\n", Circles["red"], site.getName())
					} else { // Otherwise, success.
						text += fmt.Sprintf("%sRestarting '%s'... success", Circles["green"], site.getName())
					}
				}
				return text // Return the message.
			},
		},
		{
			cmd:         "start",
			description: "Start a site.",
			callback: func(ctx context.Context, evt *event.Event, args []string) string {
				if len(args) < 2 {
					return Circles["red"] + "Invalid site."
				}
				sites, errors := getSitesByString(args[1])
				text := "" // text contains the entire message that will be sent.
				for _, error := range errors {
					text += Circles["red"] + error + "\n"
				}
				for _, site := range sites {
					if err := site.Start(); err != nil {
						text += fmt.Sprintf("%sStarting '%s'... failed!\n", Circles["red"], site.getName())
					} else {
						text += fmt.Sprintf("%sStarting '%s'... success!\n", Circles["green"], site.getName())
					}
				}
				return text
			},
		},
		{
			cmd:         "stop",
			description: "Stop a site.",
			callback: func(ctx context.Context, evt *event.Event, args []string) string {
				if len(args) < 2 {
					return Circles["red"] + "Invalid site."
				}
				sites, errors := getSitesByString(args[1])
				text := "" // text contains the entire message that will be sent.
				for _, error := range errors {
					text += Circles["red"] + error + "\n"
				}
				for _, site := range sites {
					if err := site.Stop(); err != nil {
						text += fmt.Sprintf("%sStopping '%s'... failed: %s", Circles["red"], site.getName(), err)
					} else {
						text += fmt.Sprintf("%sStopping '%s'... success", Circles["green"], site.getName())
					}
				}
				return text

			},
		},
	}
}