// Package relation builds 关系理解 content from two birth-based portraits.
package relation

import (
	"fmt"
	"time"

	"github.com/yuxingu/digital-psychology/apps/api/internal/portrait"
)

// Output is free summary + gated detail.
type Output struct {
	Summary map[string]any
	Detail  map[string]any
}

// Build compares two profiles' exploration styles (lexicon-safe copy).
func Build(aBirth, bBirth time.Time, aName, bName string) Output {
	if aName == "" {
		aName = "我"
	}
	if bName == "" {
		bName = "TA"
	}
	pa := portrait.Build(aBirth, aName)
	pb := portrait.Build(bBirth, bName)
	aLabel := str(pa.Summary["headline"])
	bLabel := str(pb.Summary["headline"])
	aKeys := strSlice(pa.Summary["keywords"])
	bKeys := strSlice(pb.Summary["keywords"])

	summary := map[string]any{
		"title":          "关系理解·基础",
		"me_style":       aLabel,
		"other_style":    bLabel,
		"me_keywords":    aKeys,
		"other_keywords": bKeys,
		"diff_one_liner": fmt.Sprintf("%s更偏内在节奏，%s的表达方式不同——差异可以成为互补，而不是对立。", aName, bName),
		"share_hint":     "了解彼此的沟通方式，查看关系理解",
	}
	detail := map[string]any{
		"title": "相处建议·完整分析",
		"communication": []string{
			fmt.Sprintf("%s：先讲清楚事实与需要，再谈感受。", aName),
			fmt.Sprintf("%s：先确认被听见，再进入方案讨论。", bName),
			"冲突时约定「复述对方一句」再回应，降低误解。",
		},
		"interaction": []string{
			"用「我观察到…我需要…」代替指责句式。",
			"每周留一次轻松同步：最近什么在消耗/滋养这段关系。",
		},
		"maintenance": []string{
			"差异标签不是评分，而是协作说明书。",
			"重要决定前，双方各写三点顾虑再合并。",
		},
		"me_behavior":    str(pa.Detail["behavior_pattern"]),
		"other_behavior": str(pb.Detail["behavior_pattern"]),
	}
	return Output{Summary: summary, Detail: detail}
}

func str(v any) string {
	s, _ := v.(string)
	return s
}

func strSlice(v any) []string {
	arr, ok := v.([]string)
	if ok {
		return arr
	}
	raw, ok := v.([]any)
	if !ok {
		return nil
	}
	out := make([]string, 0, len(raw))
	for _, x := range raw {
		if s, ok := x.(string); ok {
			out = append(out, s)
		}
	}
	return out
}