//
//  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
}

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

	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 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()

	var req *http.Request
	if req, err = http.NewRequest("POST", ctx.Config.RDXportEndpoint, &b); err != nil {
		return
	}
	req.Header.Set("Content-Type", w.FormDataContentType())

	client := &http.Client{}
	var res *http.Response
	if res, err = client.Do(req); err != nil {
		return
	}
	if res.StatusCode != http.StatusOK {
		// TODO: better error output
		err = fmt.Errorf("bad status: %s", res.Status)
	}
	return
}

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

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

	return import_audio(ctx)
}