package app

import (
	"encoding/json"

	"github.com/geo-platform/tenant-api/internal/tenant/repository"
)

const (
	generationPayloadTemplateKey            = "__snapshot_template_key"
	generationPayloadTemplateName           = "__snapshot_template_name"
	generationPayloadTemplatePromptTemplate = "__snapshot_template_prompt_template"
	generationPayloadPromptRuleID           = "__snapshot_prompt_rule_id"
	generationPayloadPromptRuleName         = "__snapshot_prompt_rule_name"
	generationPayloadPromptRuleContent      = "__snapshot_prompt_rule_content"
	generationPayloadPromptRuleScene        = "__snapshot_prompt_rule_scene"
	generationPayloadPromptRuleTone         = "__snapshot_prompt_rule_tone"
	generationPayloadPromptRuleWordCount    = "__snapshot_prompt_rule_word_count"
	generationPayloadKnowledgePrompt        = "__snapshot_knowledge_prompt"
	generationPayloadKnowledgeFacts         = "__snapshot_knowledge_fact_constraints"
	generationPayloadBrandPromptContext     = "__snapshot_brand_prompt_context"
)

func attachTemplateSnapshot(payload map[string]interface{}, record *repository.TemplateRecord) map[string]interface{} {
	if payload == nil {
		payload = map[string]interface{}{}
	}
	if record == nil {
		return payload
	}

	payload[generationPayloadTemplateKey] = record.TemplateKey
	payload[generationPayloadTemplateName] = record.TemplateName
	if record.PromptTemplate != nil {
		payload[generationPayloadTemplatePromptTemplate] = *record.PromptTemplate
	}

	return payload
}

func attachBrandPromptContext(payload map[string]interface{}, brandCtx *BrandPromptContext) map[string]interface{} {
	if payload == nil {
		payload = map[string]interface{}{}
	}
	if brandCtx == nil {
		delete(payload, generationPayloadBrandPromptContext)
		return payload
	}
	normalized := normalizeBrandPromptContext(*brandCtx)
	payload[generationPayloadBrandPromptContext] = &normalized
	return payload
}

func extractBrandPromptContext(payload map[string]interface{}) *BrandPromptContext {
	if payload == nil || payload[generationPayloadBrandPromptContext] == nil {
		return nil
	}
	encoded, err := json.Marshal(payload[generationPayloadBrandPromptContext])
	if err != nil {
		return nil
	}
	var brandCtx BrandPromptContext
	if err := json.Unmarshal(encoded, &brandCtx); err != nil {
		return nil
	}
	if brandCtx.BrandID <= 0 {
		return nil
	}
	brandCtx = normalizeBrandPromptContext(brandCtx)
	return &brandCtx
}

func attachKnowledgeFactConstraints(payload map[string]interface{}, constraints []KnowledgeFactConstraint) map[string]interface{} {
	if payload == nil {
		payload = map[string]interface{}{}
	}
	if len(constraints) == 0 {
		delete(payload, generationPayloadKnowledgeFacts)
		return payload
	}
	payload[generationPayloadKnowledgeFacts] = constraints
	return payload
}

func extractKnowledgeFactConstraints(payload map[string]interface{}) []KnowledgeFactConstraint {
	if payload == nil || payload[generationPayloadKnowledgeFacts] == nil {
		return nil
	}
	encoded, err := json.Marshal(payload[generationPayloadKnowledgeFacts])
	if err != nil {
		return nil
	}
	var constraints []KnowledgeFactConstraint
	if err := json.Unmarshal(encoded, &constraints); err != nil {
		return nil
	}
	return constraints
}

func extractTemplateSnapshot(payload map[string]interface{}) (string, string, *string) {
	templateKey := extractString(payload, generationPayloadTemplateKey)
	templateName := extractString(payload, generationPayloadTemplateName)
	promptTemplateText := extractString(payload, generationPayloadTemplatePromptTemplate)
	if templateKey == "" || templateName == "" {
		return "", "", nil
	}
	if promptTemplateText == "" {
		return templateKey, templateName, nil
	}
	return templateKey, templateName, &promptTemplateText
}

func attachPromptRuleSnapshot(payload map[string]interface{}, rule *promptRuleGenerationRecord) map[string]interface{} {
	if payload == nil {
		payload = map[string]interface{}{}
	}
	if rule == nil {
		return payload
	}

	payload[generationPayloadPromptRuleID] = rule.ID
	payload[generationPayloadPromptRuleName] = rule.Name
	payload[generationPayloadPromptRuleContent] = rule.PromptContent
	if rule.Scene != nil {
		payload[generationPayloadPromptRuleScene] = *rule.Scene
	}
	if rule.DefaultTone != nil {
		payload[generationPayloadPromptRuleTone] = *rule.DefaultTone
	}
	if rule.DefaultWordCount != nil {
		payload[generationPayloadPromptRuleWordCount] = *rule.DefaultWordCount
	}

	return payload
}

func extractPromptRuleSnapshot(payload map[string]interface{}) *promptRuleGenerationRecord {
	ruleID := int64(extractInt(payload, generationPayloadPromptRuleID))
	name := extractString(payload, generationPayloadPromptRuleName)
	content := extractString(payload, generationPayloadPromptRuleContent)
	if ruleID <= 0 || content == "" {
		return nil
	}

	record := &promptRuleGenerationRecord{
		ID:            ruleID,
		Name:          name,
		PromptContent: content,
		Status:        "enabled",
	}
	if scene := extractString(payload, generationPayloadPromptRuleScene); scene != "" {
		record.Scene = &scene
	}
	if tone := extractString(payload, generationPayloadPromptRuleTone); tone != "" {
		record.DefaultTone = &tone
	}
	if wordCount := extractInt(payload, generationPayloadPromptRuleWordCount); wordCount > 0 {
		value := wordCount
		record.DefaultWordCount = &value
	}
	return record
}