// Copyright 2023 wanderer <a_mirre at utb dot cz>
// SPDX-License-Identifier: AGPL-3.0-only

package app

import (
	"embed"
	"io/fs"

	"git.dotya.ml/mirre-mt/pcmt/app/settings"
	"git.dotya.ml/mirre-mt/pcmt/ent"
	modfuncmap "git.dotya.ml/mirre-mt/pcmt/modules/funcmap"
	"git.dotya.ml/mirre-mt/pcmt/slogging"
	"github.com/labstack/echo/v4"
	gommonlog "github.com/labstack/gommon/log"
	"golang.org/x/exp/slog"
)

type App struct {
	e             *echo.Echo
	slogger       *slogging.Slogger
	logger        slogging.Slogger
	initialised   bool
	embeds        Embeds
	templatesPath string
	assetsPath    string
	setting       *settings.Settings
	jwtkey        string //nolint:unused
	encryptionKey string //nolint:unused
	dbConnect     string //nolint:unused
	db            *ent.Client
}

type Embeds struct {
	templates embed.FS
	assets    embed.FS
}

// Init allows setting App's important fields - once.
func (a *App) Init(s *settings.Settings, logger *slogging.Slogger, dbclient *ent.Client) error {
	if !a.initialised {
		e := echo.New()

		a.e = e
		a.slogger = logger
		a.logger = *a.slogger
		a.logger.Logger = a.logger.Logger.With(
			slog.Group("pcmt extra", slog.String("module", "app")),
		)

		a.setting = s

		if a.setting.IsDevel() {
			a.setDevel()
		}

		a.Logger().Infof("app version: %s", a.setting.Version())

		a.Logger().Debug("saving db client object")
		a.db = dbclient

		if a.templatesPath == "" {
			a.templatesPath = "templates"
			a.setting.SetTemplatesPath("templates")
		} else {
			a.setting.SetTemplatesPath(a.templatesPath)
		}

		if a.assetsPath == "" {
			a.Logger().Debug("setting assets path as unset")
			a.assetsPath = "assets/public"
			a.setting.SetAssetsPath("assets")
		} else {
			a.setting.SetAssetsPath(a.assetsPath)
		}

		a.initialised = true
		a.Logger().Info("app initialised")

		return nil
	}

	return ErrAppAlreadyInitialised
}

// E returns app's *echo.Echo instance.
func (a *App) E() *echo.Echo {
	return a.e
}

// Logger returns app's pointer to the global logger instance.
func (a *App) Logger() *slogging.Slogger {
	return &a.logger
}

// PrintConfiguration outputs relevant settings of the application to console.
func (a *App) PrintConfiguration() {
	if a.setting != nil {
		if a.setting.IsLive() {
			a.Logger().Debug("live mode enabled")
		}

		if a.setting.IsDevel() {
			a.Logger().Debug("devel mode enabled - make sure that browser-sync is running")
		}

		return
	}

	panic(ErrAppSettingsUnset)
}

func (a *App) SetSettings(s *settings.Settings) {
	a.setting = s
}

// SetEmbeds saves the embedded files to application state.
func (a *App) SetEmbeds(templates, assets embed.FS) {
	if !a.setting.IsLive() {
		a.Logger().Debug("saving embeds in the app struct")

		a.embeds.templates = templates
		a.embeds.assets = assets

		var fsfs fs.FS = &assets

		// save pointer to assets to funcmap for integrity calculations.
		modfuncmap.SetEmbeds(&fsfs)
	}
}

// setDevel puts the app in devel mode, which loads a browser-sync script in
// templates and expects browser-sync running.
func (a *App) setDevel() {
	a.Logger().Debug("enabling debug logging for Echo")
	a.e.Debug = true
	a.e.Logger.SetLevel(gommonlog.DEBUG)
}