package pipeline

import (
	"context"
	"log"
	"math"

	"gorm.io/gorm"

	"spider/internal/model"
)

// ScorePhase Phase 7: 评分
type ScorePhase struct {
	db       *gorm.DB
	reporter ProgressReporter
}

// NewScorePhase creates a new ScorePhase.
func NewScorePhase(db *gorm.DB) *ScorePhase {
	return &ScorePhase{db: db}
}

func (p *ScorePhase) Name() string { return "score" }

func (p *ScorePhase) SetReporter(r ProgressReporter) { p.reporter = r }

func (p *ScorePhase) Run(ctx context.Context, task *model.Task, opts *Options) error {
	var merchants []model.MerchantClean
	p.db.Where("status = ?", "valid").Find(&merchants)

	total := len(merchants)
	log.Printf("[score] scoring %d valid merchants", total)

	for i, m := range merchants {
		if isContextDone(ctx) {
			break
		}

		if p.reporter != nil {
			p.reporter("score", i+1, total, "评分: @"+m.TgUsername)
		}

		score := calcScore(m)
		p.db.Model(&m).Update("quality_score", score)
	}

	log.Printf("[score] done")
	return nil
}

// calcScore 6 维度加权打分 (0-100)
func calcScore(m model.MerchantClean) float64 {
	// 维度1: member_count (权重 0.25)
	memberScore := memberCountScore(m.MemberCount)

	// 维度2: premium (权重 0.15)
	premiumScore := 0.0
	if m.IsPremium {
		premiumScore = 100.0
	}

	// 维度3: activity (权重 0.25)
	activityScore := activityLevelScore(m.ActiveLevel)

	// 维度4: multi_source (权重 0.20)
	multiScore := multiSourceScore(m.SourceCount)

	// 维度5: has_website (权重 0.10)
	websiteScore := 0.0
	if m.Website != "" {
		websiteScore = 100.0
	}

	// 维度6: has_email (权重 0.05)
	emailScore := 0.0
	if m.Email != "" {
		emailScore = 100.0
	}

	total := memberScore*0.25 + premiumScore*0.15 + activityScore*0.25 +
		multiScore*0.20 + websiteScore*0.10 + emailScore*0.05

	return math.Round(total*100) / 100
}

func memberCountScore(count int) float64 {
	switch {
	case count >= 100000:
		return 100
	case count >= 10000:
		return 80
	case count >= 1000:
		return 50
	case count >= 100:
		return 30
	default:
		return 10
	}
}

func activityLevelScore(level string) float64 {
	switch level {
	case "active":
		return 100
	case "moderate":
		return 50
	case "inactive":
		return 20
	default:
		return 0
	}
}

func multiSourceScore(count int) float64 {
	switch {
	case count >= 4:
		return 100
	case count == 3:
		return 70
	case count == 2:
		return 40
	default:
		return 10
	}
}