package http

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"
	"time"

	"code.c-base.org/baccenfutter/govote/store"
	"code.c-base.org/baccenfutter/govote/utils"
	"code.c-base.org/baccenfutter/govote/voting"
	"code.c-base.org/baccenfutter/govote/voting/quorum"
	"code.c-base.org/baccenfutter/govote/voting/threshold"
	"code.c-base.org/baccenfutter/govote/voting/vote"
	"github.com/google/uuid"
	"github.com/labstack/echo"
	"github.com/labstack/echo/middleware"
)

func Serve(bindAddr string) error {
  e := echo.New()
  e.Pre(middleware.RemoveTrailingSlash())
  // e.Use(middleware.Recover())

  NewTemplateRenderer(e, "tmpl/*.html")
  
  e.Static("/static", "static")
  e.GET("/", handleIndex)
  e.GET("/v", handleVotingForm)
  e.POST("/v", handleNewVoting)
  e.GET("/v/:id", handleShowVoting)
  e.POST("/v/:id", handleVote)

  return e.Start(bindAddr)
}

func handleIndex(ctx echo.Context) error {
  return ctx.Redirect(http.StatusTemporaryRedirect, "/v")
}

func handleNewVoting(ctx echo.Context) error {
  id :=utils.GenerateRandomString(11)
  var (
    formReferendum = ctx.FormValue("referendum")
    formDeadline = ctx.FormValue("deadline")
    formQuorum = ctx.FormValue("quorum")
    formThreshold = ctx.FormValue("threshold")
    formElectors = ctx.FormValue("electors")
    formAnonymous = ctx.FormValue("anonymous")
  )

  var (
    err error
    r string
    d time.Time
    q quorum.Quorum
    t threshold.Threshold
    e = []string{}
    a bool
  )

  r = formReferendum
  deadlineNum := fmt.Sprintf("%s", formDeadline[:len(formDeadline)-1])
  deadlineUnit := fmt.Sprintf("%s", formDeadline[len(formDeadline)-1:])
    deadlineInt, err := strconv.Atoi(deadlineNum)
    if err != nil {
      return err
    }
  switch deadlineUnit {
  case "m", "":
    d = time.Now().UTC().Add(time.Duration(deadlineInt)*time.Minute).Round(time.Second)
  case "h":
    d = time.Now().UTC().Add(time.Duration(deadlineInt)*time.Hour).Round(time.Second)
  case "d":
    d = time.Now().UTC().Add(time.Duration(deadlineInt)*time.Hour*24).Round(time.Second)
  default:
    panic("this code should never be reached")
  }

  if q, err = quorum.FromString(formQuorum); err != nil {
    return err
  }
  if t, err = threshold.FromString(formThreshold); err != nil {
    return err
  }
  e = strings.Split(formElectors, " ")
  if formAnonymous == "on" {
    a = true
  }

  store.NewVoting(id, r, d, q, t, e, a)
  return ctx.Redirect(http.StatusFound, fmt.Sprintf("/v/%s", id))
}

func handleVotingForm(ctx echo.Context) error {
  return ctx.Render(http.StatusOK, "voting_form", nil)
}

func handleVote(ctx echo.Context) error {
  var (
    id = uuid.New().String()
    vid = ctx.Param("id")
    elector = ctx.Request().Header.Get("X-Remote-User")
    choice = ctx.FormValue("vote")
    v *voting.Voting
    c vote.Choice
    err error
  )
  v, err = store.GetVoting(vid)
  if err != nil {
    return err
  }
  if time.Now().UTC().After(v.Deadline()) {
    return ctx.Redirect(http.StatusFound, fmt.Sprintf("/v/%s", vid))
  }
  if c, err = vote.ChoiceFromString(choice); err != nil {
    return err
  }
  store.PlaceVote(id, vid, elector, c)
  return ctx.Render(http.StatusFound, "thanks", map[string]interface{}{
    "Id": id,
    "Vid": vid,
  })
}

func handleShowVoting(ctx echo.Context) error {
  v, err := store.GetVoting(ctx.Param("id"))
  if err != nil {
    fmt.Println(err)
    return err
  }
  return ctx.Render(http.StatusOK, "voting", map[string]interface{}{
    "Voting": v,
  })
}