package fiber

import (
	"errors"
	"html/template"
	"strconv"
	"time"

	cache "git.dmitriygnatenko.ru/dima/go-common/cache/ttl_memory_cache"
	"git.dmitriygnatenko.ru/dima/go-common/db"
	"github.com/gofiber/fiber/v2"
	"github.com/gofiber/fiber/v2/middleware/basicauth"
	"github.com/gofiber/fiber/v2/middleware/cors"
	"github.com/gofiber/fiber/v2/middleware/limiter"
	"github.com/gofiber/fiber/v2/middleware/monitor"
	"github.com/gofiber/fiber/v2/middleware/recover"
	jwt "github.com/gofiber/jwt/v3"
	"github.com/gofiber/template/html/v2"

	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/middleware/language"
	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/repositories"
	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/services/auth"
	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/services/config"
	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/services/handler"
	adminHandler "git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/services/handler/admin"
	"git.dmitriygnatenko.ru/dima/dmitriygnatenko-v2/internal/services/i18n"
)

const (
	appName       = "dmitriygnatenko"
	templatesPath = "./../../internal/templates"
	staticPath    = "../../web"
	metricsURI    = "/metrics"
)

type ServiceProvider interface {
	ConfigService() *config.Service
	AuthService() *auth.Service
	CacheService() *cache.Cache
	TransactionManager() *db.TxManager
	ArticleRepository() *repositories.ArticleRepository
	TagRepository() *repositories.TagRepository
	ArticleTagRepository() *repositories.ArticleTagRepository
	UserRepository() *repositories.UserRepository
}

func Init(sp ServiceProvider) (*fiber.App, error) {
	fiberApp := fiber.New(getConfig(sp))

	// Configure web root
	fiberApp.Static("/", staticPath)

	// Configure CORS middleware
	fiberApp.Use(cors.New(getCORSConfig(sp)))

	// Configure recover middleware
	fiberApp.Use(recover.New())

	// Configure language middleware
	fiberApp.Use(language.New())

	// Configure JWT auth
	jwtAuth := jwt.New(getJWTConfig(sp))

	// Configure Basic auth
	basicAuth := basicauth.New(basicauth.Config{
		Users: map[string]string{
			sp.ConfigService().BasicAuthUser(): sp.ConfigService().BasicAuthPassword(),
		},
	})

	// Metrics
	fiberApp.Get(metricsURI, basicAuth, monitor.New(getMetricsConfig()))

	// Public handlers
	fiberApp.Get(
		"/",
		handler.MainPageHandler(
			sp.CacheService(),
			sp.ArticleRepository(),
		),
	)

	fiberApp.Get(
		"/tag/:tag", handler.TagHandler(
			sp.CacheService(),
			sp.ArticleRepository(),
			sp.TagRepository(),
		),
	)

	fiberApp.Get(
		"/article/:article",
		handler.ArticleHandler(
			sp.CacheService(),
			sp.ArticleRepository(),
			sp.TagRepository(),
		),
	)

	// Protected handlers
	admin := fiberApp.Group("/admin", jwtAuth)

	admin.Get(
		"/",
		adminHandler.ArticleHandler(sp.ArticleRepository()),
	)

	admin.All("/login", limiter.New(limiter.Config{
		Max:        int(sp.ConfigService().LoginRateLimiterMaxRequests()),
		Expiration: sp.ConfigService().LoginRateLimiterExpiration(),
	}), adminHandler.LoginHandler(
		sp.ConfigService(),
		sp.AuthService(),
		sp.UserRepository(),
	))

	admin.All(
		"/logout",
		adminHandler.LogoutHandler(sp.ConfigService()),
	)

	admin.All(
		"/user/change-password",
		adminHandler.ChangePassword(
			sp.AuthService(),
			sp.UserRepository(),
		),
	)

	admin.All(
		"/article/add",
		adminHandler.AddArticleHandler(
			sp.TransactionManager(),
			sp.ArticleRepository(),
			sp.TagRepository(),
			sp.ArticleTagRepository(),
		),
	)

	admin.All(
		"/article/edit/:id<int>",
		adminHandler.EditArticleHandler(
			sp.TransactionManager(),
			sp.ArticleRepository(),
			sp.TagRepository(),
			sp.ArticleTagRepository(),
			sp.CacheService(),
		),
	)

	admin.All(
		"/article/delete/:id<int>",
		adminHandler.DeleteArticleHandler(
			sp.TransactionManager(),
			sp.ArticleRepository(),
			sp.ArticleTagRepository(),
			sp.CacheService(),
		),
	)

	admin.Get(
		"/tag",
		adminHandler.TagHandler(sp.TagRepository()),
	)

	admin.All(
		"/tag/add",
		adminHandler.AddTagHandler(
			sp.TagRepository(),
		),
	)

	admin.All(
		"/tag/edit/:id<int>",
		adminHandler.EditTagHandler(
			sp.TagRepository(),
			sp.CacheService(),
		),
	)

	admin.All(
		"/tag/delete/:id<int>",
		adminHandler.DeleteTagHandler(
			sp.TagRepository(),
			sp.CacheService(),
		),
	)

	return fiberApp, nil
}

func getConfig(sp ServiceProvider) fiber.Config {
	return fiber.Config{
		AppName:               appName,
		DisableStartupMessage: true,
		Views:                 getViewsEngine(sp),
		ErrorHandler:          getErrorHandler(),
	}
}

// nolint
func getJWTConfig(sp ServiceProvider) jwt.Config {
	return jwt.Config{
		SigningKey:  []byte(sp.ConfigService().JWTSecretKey()),
		TokenLookup: "cookie:" + sp.ConfigService().JWTCookie(),
		ErrorHandler: func(fctx *fiber.Ctx, err error) error {
			return fctx.Redirect("/admin/login")
		},
		Filter: func(fctx *fiber.Ctx) bool {
			method := fctx.Method()
			path := fctx.Path()

			if method != fiber.MethodGet && method != fiber.MethodPost &&
				method != fiber.MethodPut && method != fiber.MethodDelete {
				return true
			}

			if path == "/admin/login" {
				return true
			}

			return false
		},
	}
}

func getMetricsConfig() monitor.Config {
	return monitor.Config{
		Title: "dmitriygnatenko.ru metrics",
	}
}

func getCORSConfig(sp ServiceProvider) cors.Config {
	return cors.Config{
		AllowOrigins: sp.ConfigService().CORSAllowOrigins(),
		AllowMethods: sp.ConfigService().CORSAllowMethods(),
	}
}

func getViewsEngine(sp ServiceProvider) *html.Engine {
	engine := html.New(templatesPath, ".html")

	// nolint:gocritic
	engine.AddFunc("now", func() time.Time {
		return time.Now()
	})

	// nolint:gosec
	engine.AddFunc("noescape", func(str string) template.HTML {
		return template.HTML(str)
	})

	engine.AddFunc("gridsep", func(i, l int) bool {
		i++
		return i%3 == 0 && i != l
	})

	engine.AddFunc("version", func() string {
		return strconv.FormatUint(uint64(sp.ConfigService().StaticVersion()), 10)
	})

	return engine
}

func getErrorHandler() fiber.ErrorHandler {
	return func(fctx *fiber.Ctx, err error) error {
		lang := i18n.Language(fctx)
		errCode := fiber.StatusInternalServerError
		var e *fiber.Error
		if errors.As(err, &e) {
			errCode = e.Code
		}

		var renderData fiber.Map

		if errCode == fiber.StatusNotFound {
			renderData = fiber.Map{
				"pageTitle": i18n.T(lang, "page_not_found_err_title"),
				"code":      fiber.StatusNotFound,
				"text":      i18n.T(lang, "page_not_found_err_desc"),
			}
		} else {
			renderData = fiber.Map{
				"pageTitle": i18n.T(lang, "internal_err_title"),
				"code":      fiber.StatusInternalServerError,
				"text":      i18n.T(lang, "internal_err_desc"),
			}
		}

		renderData["headTitle"] = i18n.T(lang, "head_title")

		return fctx.Render("error", renderData, "_layout")
	}
}