package timelines

import (
	"net/http"
	"strconv"

	"git.sleepycat.moe/sam/mercury/web/api"
	"github.com/oklog/ulid/v2"
	"github.com/rs/zerolog/log"
)

type timelineResponse struct {
	Posts []api.Post `json:"posts"`
}

func (app *App) Home(w http.ResponseWriter, r *http.Request) (timelineResponse, error) {
	ctx := r.Context()
	token, _ := app.TokenFromContext(ctx)

	var before, after *ulid.ULID
	if id, err := ulid.Parse(r.FormValue("before")); err == nil {
		before = &id
	}
	if id, err := ulid.Parse(r.FormValue("after")); err == nil {
		after = &id
	}

	if before != nil && after != nil {
		return timelineResponse{}, api.Error{Code: api.ErrBadRequest, Details: "`before` and `after` are mutually exclusive"}
	}
	limit, err := strconv.Atoi(r.FormValue("limit"))
	if err != nil || limit <= 0 || limit > 100 {
		limit = 100
	}

	posts, err := app.Timeline().Home(ctx, token.UserID, limit, before, after)
	if err != nil {
		log.Err(err).Msg("getting posts from database")
	}

	resp := timelineResponse{Posts: make([]api.Post, len(posts))}
	for i := range posts {
		resp.Posts[i] = api.DBPostToPost(posts[i].Post, posts[i].Blog)
	}

	return resp, nil
}