package processor

import (
	"strings"

	"spider/internal/model"
)

// TagAndGradeWithConfig assigns industry_tag and level using configurable rules.
func TagAndGradeWithConfig(merchants []MergedMerchant, cfg *model.GradingConfig) []TaggedMerchant {
	var result []TaggedMerchant
	for _, m := range merchants {
		tagged := TaggedMerchant{Merged: m}

		// Industry matching from config
		text := strings.ToLower(m.Best.MerchantName + " " + m.Best.OriginalText)
		for industry, keywords := range cfg.IndustryKeywords {
			for _, kw := range keywords {
				if strings.Contains(text, strings.ToLower(kw)) {
					tagged.IndustryTag = industry
					break
				}
			}
			if tagged.IndustryTag != "" {
				break
			}
		}

		// Inherit from raw if no match
		if tagged.IndustryTag == "" && m.Best.IndustryTag != "" {
			tagged.IndustryTag = m.Best.IndustryTag
		}

		// Level grading from config rules
		tagged.Level = gradeByRules(m, tagged.IndustryTag, cfg.Levels)

		result = append(result, tagged)
	}
	return result
}

// gradeByRules evaluates levels in order; first level with any matching rule wins.
// Last level (usually "Cold") is the fallback when it has no rules.
func gradeByRules(m MergedMerchant, industryTag string, levels []model.LevelDef) string {
	hasIndustry := industryTag != ""
	hasWebsite := m.Best.Website != ""
	hasEmail := m.Best.Email != ""
	hasPhone := m.Best.Phone != ""
	sourceCount := m.SourceCount

	for _, level := range levels {
		if len(level.Rules) == 0 {
			// No rules = fallback level (last one)
			continue
		}
		for _, rule := range level.Rules {
			if matchRule(rule, hasIndustry, hasWebsite, hasEmail, hasPhone, sourceCount) {
				return level.Key
			}
		}
	}

	// Return the last level as default fallback
	if len(levels) > 0 {
		return levels[len(levels)-1].Key
	}
	return "Cold"
}

func matchRule(rule model.GradeRule, hasIndustry, hasWebsite, hasEmail, hasPhone bool, sourceCount int) bool {
	if rule.HasIndustry != nil && *rule.HasIndustry != hasIndustry {
		return false
	}
	if rule.HasWebsite != nil && *rule.HasWebsite != hasWebsite {
		return false
	}
	if rule.HasEmail != nil && *rule.HasEmail != hasEmail {
		return false
	}
	if rule.HasPhone != nil && *rule.HasPhone != hasPhone {
		return false
	}
	if rule.MinSourceCount != nil && sourceCount < *rule.MinSourceCount {
		return false
	}
	return true
}

// TagAndGrade is the backward-compatible version using default config.
func TagAndGrade(merchants []MergedMerchant) []TaggedMerchant {
	cfg := model.DefaultGradingConfig()
	return TagAndGradeWithConfig(merchants, &cfg)
}

// TaggedMerchant is the final output of the processor.
type TaggedMerchant struct {
	Merged      MergedMerchant
	IndustryTag string
	Level       string
}