// Copyright © 2016 Abcum Ltd
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package web

import (
	"strconv"
	"time"

	"github.com/abcum/fibre"
	"github.com/abcum/fibre/mw"
	"github.com/abcum/surreal/db"
	"github.com/abcum/surreal/sql"
	"github.com/abcum/surreal/util/build"
	"github.com/abcum/surreal/util/show"
)

func limit(c *fibre.Context, i int64) int64 {
	if s := c.Query("limit"); len(s) > 0 {
		if x, err := strconv.ParseInt(s, 10, 64); err == nil {
			if x > i {
				return i
			}
			return x
		}
	}
	return i
}

func start(c *fibre.Context, i int64) int64 {
	if s := c.Query("start"); len(s) > 0 {
		if x, err := strconv.ParseInt(s, 10, 64); err == nil {
			if x < i {
				return i
			}
			return x
		}
	}
	return i
}

func versn(c *fibre.Context, i time.Time) time.Time {
	if s := c.Query("version"); len(s) > 0 {
		if x, err := time.Parse(sql.RFCNano, s); err == nil {
			return x
		}
	}
	return i
}

func routes(s *fibre.Fibre) {

	s.Dir("/", "app/")

	// --------------------------------------------------
	// Endpoint for health checks
	// --------------------------------------------------

	s.Get("/info", func(c *fibre.Context) error {
		return c.Send(200, build.GetInfo())
	})

	// --------------------------------------------------
	// Endpoints for submitting rpc queries
	// --------------------------------------------------

	s.Rpc("/rpc", &rpc{})

	// --------------------------------------------------
	// Endpoints for authentication signup
	// --------------------------------------------------

	s.Get("/logs", func(c *fibre.Context) error {
		return logger(c)
	})

	// --------------------------------------------------
	// Endpoints for syncing data
	// --------------------------------------------------

	s.Get("/sync", func(c *fibre.Context) error {
		return syncer(c, true) // Export
	})

	s.Post("/sync", func(c *fibre.Context) error {
		return syncer(c, false) // Import
	})

	s.Get("/export", func(c *fibre.Context) error {
		return export(c)
	})

	s.Use(mw.Type(&mw.TypeOpts{
		AllowedContent: map[string]bool{
			"application/octet-stream": true,
		},
	}).PathIs("/sync", "/export"))

	// --------------------------------------------------
	// Endpoints for authentication signup
	// --------------------------------------------------

	s.Options("/signup", func(c *fibre.Context) error {
		return c.Code(200)
	})

	s.Post("/signup", func(c *fibre.Context) error {
		return signup(c)
	})

	s.Use(mw.Quit(&mw.QuitOpts{
		Timeout: 5 * time.Second,
	}).PathIs("/signup"))

	s.Use(mw.Type(&mw.TypeOpts{
		AllowedContent: map[string]bool{
			"application/json":                  true,
			"application/cork":                  true,
			"application/cbor":                  true,
			"application/msgpack":               true,
			"application/x-www-form-urlencoded": true,
		},
	}).PathIs("/signup").MethodIsNot("OPTIONS"))

	// --------------------------------------------------
	// Endpoints for authentication signin
	// --------------------------------------------------

	s.Options("/signin", func(c *fibre.Context) error {
		return c.Code(200)
	})

	s.Post("/signin", func(c *fibre.Context) error {
		return signin(c)
	})

	s.Use(mw.Quit(&mw.QuitOpts{
		Timeout: 5 * time.Second,
	}).PathIs("/signin"))

	s.Use(mw.Type(&mw.TypeOpts{
		AllowedContent: map[string]bool{
			"application/json":                  true,
			"application/cork":                  true,
			"application/cbor":                  true,
			"application/msgpack":               true,
			"application/x-www-form-urlencoded": true,
		},
	}).PathIs("/signin").MethodIsNot("OPTIONS"))

	// --------------------------------------------------
	// Endpoints for submitting sql queries
	// --------------------------------------------------

	s.Options("/sql", func(c *fibre.Context) error {
		return c.Code(200)
	})

	s.Post("/sql", func(c *fibre.Context) error {
		res, err := db.Execute(c, c.Request().Body, nil)
		if err != nil {
			return err
		}
		return c.Send(200, res)
	})

	s.Use(mw.Type(&mw.TypeOpts{
		AllowedContent: map[string]bool{
			"text/plain":          true,
			"application/json":    true,
			"application/cork":    true,
			"application/cbor":    true,
			"application/msgpack": true,
		},
	}).PathIs("/sql").MethodIsNot("OPTIONS"))

	// --------------------------------------------------
	// Endpoints for submitting websocket sql
	// --------------------------------------------------

	s.Get("/sql", func(c *fibre.Context) error {
		if err := c.Upgrade(); err != nil {
			return err
		}
		for {
			_, msg, err := c.Socket().Read()
			if err != nil {
				return err
			}
			if res, err := db.Execute(c, msg, nil); err != nil {
				c.Socket().SendText(err.Error())
			} else {
				c.Socket().SendJSON(res)
			}
		}
	})

	// --------------------------------------------------
	// Endpoints for manipulating multiple records
	// --------------------------------------------------

	s.Options("/key/:class", func(c *fibre.Context) error {
		return c.Code(200)
	})

	s.Get("/key/:class", func(c *fibre.Context) error {

		txt := "SELECT * FROM $class LIMIT $limit START $start VERSION $versn"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"class": sql.NewTable(c.Param("class")),
			"limit": limit(c, 100),
			"start": start(c, 0),
			"versn": versn(c, time.Now()),
		})

		return show.Output(c, c.Param("class"), show.Many, show.Select, res, err)

	})

	s.Post("/key/:class", func(c *fibre.Context) error {

		var data interface{}

		if err := c.Bind(&data); err != nil {
			return fibre.NewHTTPError(422)
		}

		txt := "CREATE $class CONTENT $data RETURN AFTER"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"class": sql.NewTable(c.Param("class")),
			"data":  data,
		})

		return show.Output(c, c.Param("class"), show.Many, show.Create, res, err)

	})

	s.Delete("/key/:class", func(c *fibre.Context) error {

		txt := "DELETE $class"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"class": sql.NewTable(c.Param("class")),
		})

		return show.Output(c, c.Param("class"), show.Many, show.Delete, res, err)

	})

	// --------------------------------------------------
	// Endpoints for manipulating a single record
	// --------------------------------------------------

	s.Options("/key/:class/:id", func(c *fibre.Context) error {
		return c.Code(200)
	})

	s.Get("/key/:class/:id", func(c *fibre.Context) error {

		txt := "SELECT * FROM $thing VERSION $versn"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"thing": sql.NewThing(c.Param("class"), c.Param("id")),
			"versn": versn(c, time.Now()),
		})

		return show.Output(c, c.Param("class"), show.One, show.Select, res, err)

	})

	s.Post("/key/:class/:id", func(c *fibre.Context) error {

		var data interface{}

		if err := c.Bind(&data); err != nil {
			return fibre.NewHTTPError(422)
		}

		txt := "CREATE $thing CONTENT $data RETURN AFTER"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"thing": sql.NewThing(c.Param("class"), c.Param("id")),
			"data":  data,
		})

		return show.Output(c, c.Param("class"), show.One, show.Create, res, err)

	})

	s.Put("/key/:class/:id", func(c *fibre.Context) error {

		var data interface{}

		if err := c.Bind(&data); err != nil {
			return fibre.NewHTTPError(422)
		}

		txt := "UPDATE $thing CONTENT $data RETURN AFTER"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"thing": sql.NewThing(c.Param("class"), c.Param("id")),
			"data":  data,
		})

		return show.Output(c, c.Param("class"), show.One, show.Update, res, err)

	})

	s.Patch("/key/:class/:id", func(c *fibre.Context) error {

		var data interface{}

		if err := c.Bind(&data); err != nil {
			return fibre.NewHTTPError(422)
		}

		txt := "UPDATE $thing DIFF $data RETURN DIFF"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"thing": sql.NewThing(c.Param("class"), c.Param("id")),
			"data":  data,
		})

		return show.Output(c, c.Param("class"), show.One, show.Modify, res, err)

	})

	s.Trace("/key/:class/:id", func(c *fibre.Context) error {

		txt := "SELECT HISTORY FROM $thing"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"thing": sql.NewThing(c.Param("class"), c.Param("id")),
		})

		return show.Output(c, c.Param("class"), show.One, show.Trace, res, err)

	})

	s.Delete("/key/:class/:id", func(c *fibre.Context) error {

		txt := "DELETE $thing"

		res, err := db.Execute(c, txt, map[string]interface{}{
			"thing": sql.NewThing(c.Param("class"), c.Param("id")),
		})

		return show.Output(c, c.Param("class"), show.One, show.Delete, res, err)

	})

	s.Use(mw.Type(&mw.TypeOpts{
		AllowedContent: map[string]bool{
			"application/json":         true,
			"application/cork":         true,
			"application/cbor":         true,
			"application/msgpack":      true,
			"application/vnd.api+json": true,
		},
	}).PathBegsWith("/key/").MethodIsNot("OPTIONS"))

}