package db

import (
	"git.giftfish.de/ston1th/gowiki/pkg/core"
	"git.giftfish.de/ston1th/gowiki/pkg/render"
	"git.giftfish.de/ston1th/gowiki/pkg/store"
	"git.giftfish.de/ston1th/gowiki/pkg/util"
)

var (
	errPageNotFound      = store.ErrKeyNotFound
	errInvalidPermission = dbErr("invalid permission")
	errPrivateWikiPage   = dbErr("private wiki pages are not allowed")
)

func (db *DB) GetPage(title, username string) (p *core.Page, err error) {
	p = db.cache.Get(title)
	if p == nil {
		p = new(core.Page)
		err = db.pages.Get(title, p)
		db.cache.Add(title, p)
	}
	if !core.ReadPerm(username, p) {
		err = errPageNotFound
	}
	return
}

func (db *DB) pageExists(title, username string) (p *core.Page, err error) {
	p = new(core.Page)
	err = db.pages.Get(title, p)
	if err != nil {
		return
	}
	if !core.ReadPerm(username, p) {
		err = errPageNotFound
	}
	return
}

func (db *DB) CreatePage(title, section, markdown, username string, p core.Permission) (page *core.Page, err error) {
	if p == core.Invalid {
		err = errInvalidPermission
		return
	}
	if section == wikiSection && p == core.Private {
		err = errPrivateWikiPage
		return
	}
	st := util.StoreTitle(section, title)
	if _, err = db.pageExists(st, username); err != nil {
		return
	}

	page = &core.Page{
		Title:    title,
		Markdown: markdown,
		Created:  created(username),
		Owner:    username,
		Perm:     p,
	}
	search := render.Render(page)

	err = db.pages.Set(st, page)
	if err != nil {
		return
	}

	err = db.Index.Add(title, st, search)
	if err != nil {
		return
	}
	db.cache.Add(st, page)
	return
}

func (db *DB) UpdatePage(title, section, markdown, username string, perm int) (page *core.Page, err error) {
	p := core.ParsePerm(perm)
	if p == core.Invalid {
		err = errInvalidPermission
		return
	}
	if section == wikiSection && p == core.Private {
		err = errPrivateWikiPage
		return
	}
	st := util.StoreTitle(section, title)
	page, err = db.pageExists(st, username)
	if err != nil {
		return
	}

	page.Markdown = markdown
	page.Updated = created(username)
	page.Perm = p
	search := render.Render(page)

	err = db.pages.Set(st, page)
	if err != nil {
		return
	}

	err = db.Index.Add(title, st, search)
	if err != nil {
		return
	}
	db.cache.Add(st, page)
	return
}

func (db *DB) DeletePage(title, section, username string) (err error) {
	st := util.StoreTitle(section, title)
	if _, err = db.pageExists(st, username); err != nil {
		return
	}
	if err = db.pages.Delete(st); err != nil {
		return
	}
	return db.Index.Delete(st)
}