package controllers

import (
	"InfantrySkillCalculator/models"
	"InfantrySkillCalculator/utils"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"math"
	"net"
	"net/http"
	"sort"
	"time"

	"github.com/gin-gonic/gin"
)

// GetScoreByPlayerID GET /score/:player_id
func GetScoreByPlayerID(c *gin.Context) {
	var player models.Player

	if err := models.DB.Where("id = ?", c.Param("player_id")).First(&player).Error; err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Player not found!"})
		utils.Logger.Errorf("[SCORE] Player not found: %s", err.Error())
		return
	}

	score, err := models.PlayerCache.GetScore(player.ID)
	var statusCode = http.StatusOK
	if err != nil || score == -1 {
		score, statusCode = GetPlayerScoreNew(player.Name)
		if score == score && score != -1 { // not NaN
			if err := models.PlayerCache.SetScore(player.ID, score); err != nil {
				utils.Logger.Errorf("[SCORE] Failed to cache player score: %s", err.Error())
				return
			}
		}
	}

	switch statusCode {
	case 200:
		c.String(200, fmt.Sprintf("%.2f", score))
	case 404:
		c.String(200, "<i class=\"bi bi-person-x-fill me-2 text-danger fs-5\" style=\"margin-left: 0.69rem;\" data-bs-action=\"tooltip\" data-bs-title=\"Spieler nicht gefunden\"></i>")
	case 503, 504, 408:
		c.String(statusCode, "<i class=\"bi bi-cloud-slash-fill me-2 text-danger fs-5\" style=\"margin-left: 0.69rem;\"data-bs-action=\"tooltip\" data-bs-title=\"Tracker nicht erreichbar\"></i>")
	default:
		c.String(statusCode, "<i class=\"bi bi-exclamation-circle-fill me-2 text-danger fs-5\" style=\"margin-left: 0.69rem;\" data-bs-action=\"tooltip\" data-bs-title=\"Unbekannter Fehler\"></i>")
		utils.Logger.Warnf("[SCORE] Invalid request! Player: %s, Score: %f", player.Name, score)
	}
}

// GetScoreByPlayerName POST /score/:player_name
func GetScoreByPlayerName(c *gin.Context) {
	playerName := c.Param("player_name")
	score, statusCode := GetPlayerScoreNew(playerName)

	switch statusCode {
	case 200:
		c.String(200, fmt.Sprintf("%.2f", score))
	case 404:
		c.String(200, "Spieler nicht gefunden!")
	case 503, 504, 408:
		c.String(statusCode, "Tracker nicht erreichbar!")
	default:
		c.String(statusCode, "Ungültige Abfrage!")
		utils.Logger.Warnf("[SCORE] Invalid request! Player: %s, Score: %f", playerName, score)
	}
}

func GetPlayerScore(playerName string) (float32, int) {
	playerData, statusCode := getPlayerData(playerName)
	if statusCode != 200 {
		return -1, statusCode
	}
	return calcPlayerScore(playerData), statusCode
}

func GetPlayerScoreNew(playerName string) (float32, int) {
	playerData, statusCode := getPlayerData(playerName)
	//if statusCode == 408 { // retry once
	//	playerData, statusCode = getPlayerData(playerName)
	//}
	if statusCode != 200 {
		return -1, statusCode
	}
	return calcPlayerScoreNew(playerData), statusCode
}

func getPlayerData(playerName string) (*models.TrackerDataJSON, int) {
	c := http.Client{
		Timeout: 14 * time.Second, // Cloudflare timeout is 15s
	}

	reqUri := "https://api.gametools.network/bf2042/stats/?raw=false&format_values=false&name=" + playerName + "&platform=pc"
	req, err := http.NewRequest("GET", reqUri, nil)
	if err != nil {
		utils.Logger.Errorf("[SCORE] Failed to create request: %s", err.Error())
		return nil, 0
	}

	req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36")
	req.Header.Set("Accept-Encoding", "gzip, deflate, br")

	res, err := c.Do(req)
	if err != nil {
		var e net.Error
		if errors.As(err, &e) && e.Timeout() {
			utils.Logger.Errorf("[SCORE] Request timeout!")
			return nil, 408
		}

		utils.Logger.Errorf("[SCORE] Failed to send request: %s", err.Error())
		return nil, 0
	}

	defer func(Body io.ReadCloser) {
		_ = Body.Close()
	}(res.Body)
	if res.StatusCode == 404 {
		utils.Logger.Errorf("[SCORE] User does not exist!")
		return nil, res.StatusCode
	} else if res.StatusCode == 503 || res.StatusCode == 504 {
		utils.Logger.Errorf("[SCORE] Service unavailable!")
		return nil, res.StatusCode
	} else if res.StatusCode != 200 {
		utils.Logger.Errorf("[SCORE] Status code error: %d %s", res.StatusCode, res.Status)
		return nil, res.StatusCode
	}

	encoding := res.Header.Get("Content-Encoding")
	reader, err := utils.DecompressResponseBody(encoding, res.Body)
	if err != nil {
		utils.Logger.Errorf("[SCORE] Failed to decompress response body: %s", err.Error())
		return nil, 0
	}
	defer reader.Close()

	var response models.TrackerDataJSON
	body, err := io.ReadAll(reader)
	if err != nil {
		utils.Logger.Errorf("[SCORE] Failed to read response body: %s", err.Error())
		return nil, 0
	}
	if err := json.Unmarshal(body, &response); err != nil {
		utils.Logger.Errorf("[SCORE] Failed to deserialize tracker API response: %s", err)
		return nil, 0
	}

	return &response, 200
}

func calcPlayerScoreNew(playerData *models.TrackerDataJSON) float32 {
	const KdFactor = 0.5
	const KpmFactor = 0.3
	const ObjectiveFactor = 0.15
	const SupportFactor = 0.05
	const NormalizeFactor = 1.3

	cleanedKills := playerData.DivKills.ADS + playerData.DivKills.Hip - playerData.DivKills.AI
	kd := float64(cleanedKills) / float64(playerData.Deaths)
	kpm := float64(cleanedKills) / float64(playerData.SecondsPlayed/60.0)
	objective := float64(playerData.XP[0].Ribbons.Objective) / float64(playerData.XP[0].Ribbons.Total)
	support := float64(playerData.XP[0].Ribbons.Support+playerData.XP[0].Ribbons.Squad) / float64(playerData.XP[0].Ribbons.Total)

	score := (kd * KdFactor) + (kpm * KpmFactor) + (objective * ObjectiveFactor) + (support * SupportFactor)
	score *= NormalizeFactor

	return float32(score)
}

func calcPlayerScore(playerData *models.TrackerDataJSON) float32 {
	gameMetrics := GetGameMetric("BF2042")
	if gameMetrics == nil {
		utils.Logger.Errorf("[SCORE] No game metrics specified for '%s'", "BF2042")
		return -1
	}

	normalizeFactor := gameMetrics.NormalizeFactor
	topWeaponCount := gameMetrics.TopWeaponCount

	sort.SliceStable(playerData.Weapons, func(i, j int) bool { return playerData.Weapons[i].Kills > playerData.Weapons[j].Kills })
	var top []models.Weapon

	for _, weapon := range playerData.Weapons {
		if len(top) >= topWeaponCount || weapon.Kills < 100 {
			break
		}

		acc := (float64(weapon.ShotsHit) / float64(weapon.ShotsFired)) * 100
		kpm := weapon.KPM

		weaponMetrics := FindWeaponMetric(gameMetrics.WeaponMetrics, weapon.Type)
		if weaponMetrics == nil {
			utils.Logger.Errorf("[SCORE] No weapon metrics specified for '%s'", weapon.Type)
			continue
		}

		accFactor := weaponMetrics.AccuracyFactor
		kpmFactor := weaponMetrics.KpmFactor

		acc /= accFactor
		kpm /= kpmFactor
		weapon.Accuracy = acc
		weapon.KPM = kpm

		top = append(top, weapon)
	}

	sumAcc := 0.0
	sumKpm := 0.0

	for _, w := range top {
		sumAcc += w.Accuracy
		sumKpm += w.KPM
	}
	accAvg := sumAcc / float64(len(top))
	kpmAvg := sumKpm / float64(len(top))
	score := math.Round(((accAvg*kpmAvg)/normalizeFactor)*100) / 100

	return float32(score)
}