package style8d

import (
	"encoding/json"
	"strings"
)

var dimensionLabels = map[string]string{
	"d1Tone":        "D1 語氣人格",
	"d2Structure":   "D2 結構模板",
	"d3Interaction": "D3 互動方式",
	"d4Topics":      "D4 主題分布",
	"d5Rhythm":      "D5 發文節奏",
	"d6Visual":      "D6 視覺語法",
	"d7Conversion":  "D7 轉換方式",
	"d8Risk":        "D8 風險紅線",
}

var dimensionOrder = []string{
	"d1Tone", "d2Structure", "d3Interaction", "d4Topics",
	"d5Rhythm", "d6Visual", "d7Conversion", "d8Risk",
}

// ParseStoredProfile decodes the persona.style_profile JSON blob.
func ParseStoredProfile(raw string) (*StoredProfile, bool) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return nil, false
	}
	var profile StoredProfile
	if err := json.Unmarshal([]byte(raw), &profile); err != nil {
		return nil, false
	}
	if len(profile.Analysis) == 0 && strings.TrimSpace(profile.PersonaDraft) == "" {
		return nil, false
	}
	return &profile, true
}

// HasReady8D returns true when D1–D8 summaries exist and can drive copy generation.
// personaDraft or legacy persona text alone is not sufficient for matrix/copy gates.
func HasReady8D(personaText, styleProfileJSON string) bool {
	_ = personaText
	return BuildStyle8DPromptBlock(styleProfileJSON) != ""
}

var copyVoiceDimensionOrder = []string{"d1Tone", "d8Risk"}

// BuildStyle8DPromptBlock formats D1–D8 summaries for LLM prompts.
func BuildStyle8DPromptBlock(styleProfileJSON string) string {
	return buildStylePromptBlock(styleProfileJSON, dimensionOrder, "【8D 風格策略】\n產文必須遵守：\n")
}

// BuildLightPersonaVoiceBlock keeps only tone + risk guardrails for copy generation.
func BuildLightPersonaVoiceBlock(styleProfileJSON string) string {
	return buildStylePromptBlock(
		styleProfileJSON,
		copyVoiceDimensionOrder,
		"【語氣與禁忌參考】\n以下僅供口語風格與紅線參考，勿照搬句型、段落模板或固定 hook：\n",
	)
}

func buildStylePromptBlock(styleProfileJSON string, keys []string, header string) string {
	profile, ok := ParseStoredProfile(styleProfileJSON)
	if !ok {
		return ""
	}
	lines := make([]string, 0, len(keys))
	for _, key := range keys {
		summary := strings.TrimSpace(profile.Analysis[key].Summary)
		if summary == "" {
			continue
		}
		label := dimensionLabels[key]
		if label == "" {
			label = key
		}
		lines = append(lines, label+"："+summary)
	}
	if len(lines) == 0 {
		return ""
	}
	var b strings.Builder
	b.WriteString(header)
	b.WriteString(strings.Join(lines, "\n"))
	return b.String()
}

// ResolvePersonaBlock combines explicit persona positioning with analyzed writing fingerprints.
// The persona field answers "who this is"; personaDraft/style profile answers "how this person says things".
func ResolvePersonaBlock(personaText, styleProfileJSON, brief string) string {
	var parts []string

	profile, hasProfile := ParseStoredProfile(styleProfileJSON)
	persona := strings.TrimSpace(personaText)
	if persona != "" {
		parts = append(parts, "【人設定位】\n"+persona)
	} else if fallback := strings.TrimSpace(brief); fallback != "" {
		parts = append(parts, "【人設定位】\n"+fallback)
	}

	if hasProfile {
		if draft := strings.TrimSpace(profile.PersonaDraft); draft != "" {
			parts = append(parts, "【語言指紋與寫作規則】\n"+draft)
		}
	}

	if block := BuildLightPersonaVoiceBlock(styleProfileJSON); block != "" {
		parts = append(parts, block)
	}
	return strings.TrimSpace(strings.Join(parts, "\n\n"))
}