package v1

import (
	"fmt"
	"strconv"
	"time"

	"git.zxq.co/ripple/rippleapi/common"
)

type userScore struct {
	score
	Beatmap beatmap `json:"beatmap"`
}

type userScoresResponse struct {
	common.ResponseBase
	Scores []userScore `json:"scores"`
}

const userScoreSelectBase = `
SELECT
	scores.id, scores.beatmap_md5, scores.score,
	scores.max_combo, scores.full_combo, scores.mods,
	scores.300_count, scores.100_count, scores.50_count,
	scores.gekis_count, scores.katus_count, scores.misses_count,
	scores.time, scores.play_mode, scores.accuracy, scores.pp,
	scores.completed,

	beatmaps.beatmap_id, beatmaps.beatmapset_id, beatmaps.beatmap_md5,
	beatmaps.song_name, beatmaps.ar, beatmaps.od, beatmaps.difficulty_std,
	beatmaps.difficulty_taiko, beatmaps.difficulty_ctb, beatmaps.difficulty_mania,
	beatmaps.max_combo, beatmaps.hit_length, beatmaps.ranked,
	beatmaps.ranked_status_freezed, beatmaps.latest_update
FROM scores
INNER JOIN beatmaps ON beatmaps.beatmap_md5 = scores.beatmap_md5
INNER JOIN users ON users.id = scores.userid
`

// UserScoresBestGET retrieves the best scores of an user, sorted by PP if
// mode is standard and sorted by ranked score otherwise.
func UserScoresBestGET(md common.MethodData) common.CodeMessager {
	cm, wc, param := whereClauseUser(md, "users")
	if cm != nil {
		return *cm
	}
	mc := genModeClause(md)
	// Do not print 0pp scores on std
	if getMode(md.C.Query("mode")) == "std" {
		mc += " AND scores.pp > 0"
	}
	return scoresPuts(md, fmt.Sprintf(
		`WHERE
			scores.completed = '3'
			AND %s
			%s
			AND users.privileges & 1 > 0
		ORDER BY scores.pp DESC, scores.score DESC %s`,
		wc, mc, common.Paginate(md.C.Query("p"), md.C.Query("l"), 100),
	), param)
}

// UserScoresRecentGET retrieves an user's latest scores.
func UserScoresRecentGET(md common.MethodData) common.CodeMessager {
	cm, wc, param := whereClauseUser(md, "users")
	if cm != nil {
		return *cm
	}
	return scoresPuts(md, fmt.Sprintf(
		`WHERE
			%s
			%s
			AND users.privileges & 1 > 0
		ORDER BY scores.time DESC %s`,
		wc, genModeClause(md), common.Paginate(md.C.Query("p"), md.C.Query("l"), 100),
	), param)
}

func getMode(m string) string {
	switch m {
	case "1":
		return "taiko"
	case "2":
		return "ctb"
	case "3":
		return "mania"
	default:
		return "std"
	}
}

func genModeClause(md common.MethodData) string {
	var modeClause string
	if md.C.Query("mode") != "" {
		m, err := strconv.Atoi(md.C.Query("mode"))
		if err == nil && m >= 0 && m <= 3 {
			modeClause = fmt.Sprintf("AND scores.play_mode = '%d'", m)
		}
	}
	return modeClause
}

func scoresPuts(md common.MethodData, whereClause string, params ...interface{}) common.CodeMessager {
	rows, err := md.DB.Query(userScoreSelectBase+whereClause, params...)
	if err != nil {
		md.Err(err)
		return Err500
	}
	var scores []userScore
	for rows.Next() {
		var (
			us userScore
			t  string
			b  beatmap
		)
		err = rows.Scan(
			&us.ID, &us.BeatmapMD5, &us.Score,
			&us.MaxCombo, &us.FullCombo, &us.Mods,
			&us.Count300, &us.Count100, &us.Count50,
			&us.CountGeki, &us.CountKatu, &us.CountMiss,
			&t, &us.PlayMode, &us.Accuracy, &us.PP,
			&us.Completed,

			&b.BeatmapID, &b.BeatmapsetID, &b.BeatmapMD5,
			&b.SongName, &b.AR, &b.OD, &b.Diff2.STD,
			&b.Diff2.Taiko, &b.Diff2.CTB, &b.Diff2.Mania,
			&b.MaxCombo, &b.HitLength, &b.Ranked,
			&b.RankedStatusFrozen, &b.LatestUpdate,
		)
		b.Difficulty = b.Diff2.STD
		if err != nil {
			md.Err(err)
			return Err500
		}
		// puck feppy
		us.Time, err = time.Parse(common.OsuTimeFormat, t)
		if _, ok := err.(*time.ParseError); !ok && err != nil {
			md.Err(err)
			return Err500
		}
		us.Beatmap = b
		scores = append(scores, us)
	}
	r := userScoresResponse{}
	r.Code = 200
	r.Scores = scores
	return r
}