package auth

import (
	m "platform/web/models"

	"github.com/gofiber/fiber/v2"
)

type AuthCtx struct {
	User    *m.User    `json:"account,omitempty"`
	Admin   *m.Admin   `json:"admin,omitempty"`
	Client  *m.Client  `json:"client,omitempty"`
	Scopes  []string   `json:"scopes,omitempty"`
	Session *m.Session `json:"session,omitempty"`
	smap    map[string]struct{}
}

func (a *AuthCtx) PermitUser(scopes ...string) (*AuthCtx, error) {
	if a.User == nil {
		return a, ErrAuthenticateForbidden
	}
	if !a.checkScopes(scopes...) {
		return a, ErrAuthenticateForbidden
	}
	return a, nil
}

func (a *AuthCtx) PermitAdmin(scopes ...string) (*AuthCtx, error) {
	if a.Admin == nil {
		return a, ErrAuthenticateForbidden
	}
	if !a.checkScopes(scopes...) {
		return a, ErrAuthenticateForbidden
	}
	return a, nil
}

func (a *AuthCtx) PermitSecretClient(scopes ...string) (*AuthCtx, error) {
	if a.Client == nil {
		return a, ErrAuthenticateForbidden
	}
	if a.Client.Spec != m.ClientSpecAPI && a.Client.Spec != m.ClientSpecWeb {
		return a, ErrAuthenticateForbidden
	}
	if !a.checkScopes(scopes...) {
		return a, ErrAuthenticateForbidden
	}
	return a, nil
}

func (a *AuthCtx) PermitOfficialClient(scopes ...string) (*AuthCtx, error) {
	if a.Client == nil {
		return a, ErrAuthenticateForbidden
	}
	if a.Client.Spec != m.ClientSpecAPI && a.Client.Spec != m.ClientSpecWeb {
		return a, ErrAuthenticateForbidden
	}
	if a.Client.Type != m.ClientTypeOfficial {
		return a, ErrAuthenticateForbidden
	}
	if !a.checkScopes(scopes...) {
		return a, ErrAuthenticateForbidden
	}
	return a, nil
}

func (a *AuthCtx) checkScopes(scopes ...string) bool {
	if len(scopes) == 0 || len(a.Scopes) == 0 {
		return true
	}
	if len(a.smap) == 0 && len(a.Scopes) > 0 {
		for _, scope := range scopes {
			a.smap[scope] = struct{}{}
		}
	}
	for _, scope := range scopes {
		if _, ok := a.smap[scope]; ok {
			return true
		}
	}
	return false
}

const AuthCtxKey = "session"

func SetAuthCtx(c *fiber.Ctx, auth *AuthCtx) {
	c.Locals(AuthCtxKey, auth)
}

func GetAuthCtx(c *fiber.Ctx) *AuthCtx {
	if authCtx, ok := c.Locals(AuthCtxKey).(*AuthCtx); ok {
		return authCtx
	}
	return nil
}