//
//  rhimportd
//
//  The Radio Helsinki Rivendell Import Daemon
//
//
//  Copyright (C) 2015 Christian Pointner <equinox@helsinki.at>
//
//  This file is part of rhimportd.
//
//  rhimportd is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  any later version.
//
//  rhimportd is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with rhimportd. If not, see <http://www.gnu.org/licenses/>.
//

package rhimport

import (
	"bytes"
	"fmt"
	"io"
	"mime/multipart"
	"net/http"
	"os"
	"path"
)

var (
	bool2str = map[bool]string{false: "0", true: "1"}
)

type ImportContext struct {
	*Config
	*RdDb
	UserName             string
	Password             string
	Trusted              bool
	ShowId               int
	GroupName            string
	Cart                 int
	Cut                  int
	Channels             int
	NormalizationLevel   int
	AutotrimLevel        int
	UseMetaData          bool
	SourceUri            string
	SourceFile           string
	DeleteSourceFile     bool
	DeleteSourceDir      bool
	ProgressCallBack     func(step int, step_name string, progress float64, userdata interface{})
	ProgressCallBackData interface{}
}

func NewImportContext(conf *Config, rddb *RdDb, user string, group string) *ImportContext {
	ctx := new(ImportContext)
	ctx.Config = conf
	ctx.RdDb = rddb
	ctx.UserName = user
	ctx.Password = ""
	ctx.Trusted = false
	ctx.ShowId = 0
	ctx.GroupName = group
	ctx.Cart = 0
	ctx.Cut = 0
	ctx.Channels = 2
	ctx.NormalizationLevel = -1200
	ctx.AutotrimLevel = 0
	ctx.UseMetaData = false
	ctx.SourceFile = ""
	ctx.DeleteSourceFile = false
	ctx.DeleteSourceDir = false
	ctx.ProgressCallBack = nil

	return ctx
}

func (ctx *ImportContext) getPassword(cached bool) (err error) {
	req := getPasswordRequest{}
	req.username = ctx.UserName
	req.cached = cached
	req.response = make(chan getPasswordResult)
	ctx.RdDb.getPasswordChan <- req

	res := <-req.response
	if res.err != nil {
		err = res.err
		return
	}
	ctx.Password = res.password
	return
}

func (ctx *ImportContext) getShowInfo() (err error) {
	req := getShowInfoRequest{}
	req.showid = ctx.ShowId
	req.response = make(chan getShowInfoResult)
	ctx.RdDb.getShowInfoChan <- req

	res := <-req.response
	if res.err != nil {
		err = res.err
		return
	}
	rhdl.Printf("Title of show %d is '%s'", ctx.ShowId, res.title)
	return
}

func send_post_request(url string, b *bytes.Buffer, contenttype string) (err error) {
	var req *http.Request
	if req, err = http.NewRequest("POST", url, b); err != nil {
		return
	}
	if contenttype != "" {
		req.Header.Set("Content-Type", contenttype)
	}

	client := &http.Client{}
	var res *http.Response
	if res, err = client.Do(req); err != nil {
		return
	}
	defer res.Body.Close()

	if res.StatusCode != http.StatusOK {
		// TODO: better error output
		err = fmt.Errorf("bad status: %s", res.Status)
	}
	return
}


func add_cart(ctx *ImportContext) (err error) {
	var b bytes.Buffer
	w := multipart.NewWriter(&b)

	if err = w.WriteField("COMMAND", "12"); err != nil {
		return
	}
	if err = w.WriteField("LOGIN_NAME", ctx.UserName); err != nil {
		return
	}
	if err = w.WriteField("PASSWORD", ctx.Password); err != nil {
		return
	}
	if err = w.WriteField("GRPOUP_NAME", ctx.GroupName); err != nil {
		return
	}
	if err = w.WriteField("TYPE", "audio"); err != nil {
		return
	}
	if ctx.Cart != 0 {
		if err = w.WriteField("CART_NUMBER", fmt.Sprintf("%d", ctx.Cart)); err != nil {
			return
		}
	}
	w.Close()
	return send_post_request(ctx.Config.RDXportEndpoint, &b, w.FormDataContentType())
}

func add_cut(ctx *ImportContext) (err error) {
	var b bytes.Buffer
	w := multipart.NewWriter(&b)

	if err = w.WriteField("COMMAND", "10"); err != nil {
		return
	}
	if err = w.WriteField("LOGIN_NAME", ctx.UserName); err != nil {
		return
	}
	if err = w.WriteField("PASSWORD", ctx.Password); err != nil {
		return
	}
	if err = w.WriteField("CART_NUMBER", fmt.Sprintf("%d", ctx.Cart)); err != nil {
		return
	}
	w.Close()
	return send_post_request(ctx.Config.RDXportEndpoint, &b, w.FormDataContentType())
}

func remove_cart(ctx *ImportContext) (err error) {
	var b bytes.Buffer
	w := multipart.NewWriter(&b)

	if err = w.WriteField("COMMAND", "13"); err != nil {
		return
	}
	if err = w.WriteField("LOGIN_NAME", ctx.UserName); err != nil {
		return
	}
	if err = w.WriteField("PASSWORD", ctx.Password); err != nil {
		return
	}
	if err = w.WriteField("CART_NUMBER", fmt.Sprintf("%d", ctx.Cart)); err != nil {
		return
	}
	w.Close()
	return send_post_request(ctx.Config.RDXportEndpoint, &b, w.FormDataContentType())
}


func import_audio(ctx *ImportContext) (err error) {
	var b bytes.Buffer
	w := multipart.NewWriter(&b)

	if err = w.WriteField("COMMAND", "2"); err != nil {
		return
	}
	if err = w.WriteField("LOGIN_NAME", ctx.UserName); err != nil {
		return
	}
	if err = w.WriteField("PASSWORD", ctx.Password); err != nil {
		return
	}
	if err = w.WriteField("CART_NUMBER", fmt.Sprintf("%d", ctx.Cart)); err != nil {
		return
	}
	if err = w.WriteField("CUT_NUMBER", fmt.Sprintf("%d", ctx.Cut)); err != nil {
		return
	}
	if err = w.WriteField("CHANNELS", fmt.Sprintf("%d", ctx.Channels)); err != nil {
		return
	}
	if err = w.WriteField("NORMALIZATION_LEVEL", fmt.Sprintf("%d", ctx.NormalizationLevel)); err != nil {
		return
	}
	if err = w.WriteField("AUTOTRIM_LEVEL", fmt.Sprintf("%d", ctx.AutotrimLevel)); err != nil {
		return
	}
	if err = w.WriteField("USE_METADATA", bool2str[ctx.UseMetaData]); err != nil {
		return
	}

	var f *os.File
	var fw io.Writer
	if f, err = os.Open(ctx.SourceFile); err != nil {
		return
	}
	if fw, err = w.CreateFormFile("FILENAME", path.Base(ctx.SourceFile)); err != nil {
		return
	}
	if _, err = io.Copy(fw, f); err != nil {
		return
	}
	f.Close()
	w.Close()

	return send_post_request(ctx.Config.RDXportEndpoint, &b, w.FormDataContentType())
}

func cleanup_files(ctx *ImportContext) {
	if ctx.DeleteSourceFile {
		rhdl.Printf("importer: removing file: %s", ctx.SourceFile)
		if err := os.Remove(ctx.SourceFile); err != nil {
			rhl.Printf("importer: error removing source file: %s", err)
			return
		}
		if ctx.DeleteSourceDir {
			dir := path.Dir(ctx.SourceFile)
			rhdl.Printf("importer: also removing directory: %s", dir)
			if err := os.Remove(dir); err != nil {
				rhl.Printf("importer: error removing source directory: %s", err)
			}
		}
	}
	return
}

func ImportFile(ctx *ImportContext) (err error) {
	rhl.Println("ImportFile called for", ctx.SourceFile)
	defer cleanup_files(ctx)

	if ctx.ProgressCallBack != nil {
		ctx.ProgressCallBack(2, "importing", 0.0, ctx.ProgressCallBackData)
	}

	if ctx.Trusted {
		if err = ctx.getPassword(true); err != nil {
			return
		}
	}

	if err = import_audio(ctx); err != nil {
		return
	}

	if ctx.ProgressCallBack != nil {
		ctx.ProgressCallBack(2, "importing", 1.0, ctx.ProgressCallBackData)
	}

	rhl.Println("ImportFile succesfully imported", ctx.SourceFile)
	return
}