package ctxmgr

import (
	"chat-agent-system/internal/db"
	"context"
	"os"
	"strings"
	"testing"
	"time"

	"github.com/jackc/pgx/v5/pgxpool"
)

func TestContextManager_PreferenceReflection(t *testing.T) {
	mgr := NewContextManager(nil, nil, DefaultTimeDecayConfig())
	ctx := context.Background()

	userID := int64(99)
	sessionID := "sess_pref_test"

	// 模拟用户发送了多次体现其工作习惯的消息
	_ = mgr.RecordUserMessage(ctx, sessionID, userID, "user", "说重点，太长了不要废话，直接给结论。", "QUERY_PROGRESS", "PREEMPT", nil)
	_ = mgr.RecordUserMessage(ctx, sessionID, userID, "user", "本次申报重点关注国内NMPA与欧洲CE合规，另外严格把控工期排期和成本预算。", "SUPPLEMENT_INFO", "EXPECTATION_HIT", nil)
	_ = mgr.RecordUserMessage(ctx, sessionID, userID, "user", "文末请务必附带适合向高管汇报的 PPT 要点清单。", "SUPPLEMENT_INFO", "EXPECTATION_HIT", nil)

	pref, err := mgr.GetUserPreference(ctx, userID)
	if err != nil {
		t.Fatalf("get user preference failed: %v", err)
	}

	// 1. 验证沟通风格是否被提炼为精炼结构化
	if pref.CommunicationStyle != StyleConciseStructured {
		t.Errorf("expected StyleConciseStructured, got %s", pref.CommunicationStyle)
	}

	// 2. 验证关注领域是否包含合规、预算和周期
	hasReg := false
	hasCost := false
	hasTimeline := false
	for _, f := range pref.FocusAreas {
		if f == "reg_compliance" {
			hasReg = true
		}
		if f == "cost_budget" {
			hasCost = true
		}
		if f == "timeline" {
			hasTimeline = true
		}
	}
	if !hasReg || !hasCost || !hasTimeline {
		t.Errorf("missing focus areas in preference: %v", pref.FocusAreas)
	}

	// 3. 验证输出格式偏好
	if pref.OutputFormatPref != "ppt_bullets" {
		t.Errorf("expected ppt_bullets, got %s", pref.OutputFormatPref)
	}

	// 4. 验证生成的个性化 Prompt 指导语
	guidance := mgr.reflector.GeneratePromptGuidance(pref)
	if !strings.Contains(guidance, "结构精炼、结论先行") {
		t.Errorf("guidance missing concise style instruction: %s", guidance)
	}
	if !strings.Contains(guidance, "法规标准合规与审评审批风险") {
		t.Errorf("guidance missing reg compliance focus: %s", guidance)
	}
	if !strings.Contains(guidance, "PPT") || !strings.Contains(guidance, "条目清单") {
		t.Errorf("guidance missing ppt format instruction: %s", guidance)
	}

	// 5. 验证 CompilePromptGuidance 公共接口
	compiledGuidance, err := mgr.CompilePromptGuidance(ctx, userID)
	if err != nil {
		t.Fatalf("CompilePromptGuidance failed: %v", err)
	}
	if compiledGuidance != guidance {
		t.Errorf("expected compiled guidance to match reflector output, got %s", compiledGuidance)
	}
}

func TestContextManager_TimeDecayActivities(t *testing.T) {
	mgr := NewContextManager(nil, nil, TimeDecayConfig{
		Enabled:         true,
		HalfLifeDays:    7.0,
		MinWeightFloor:  0.10,
		MilestoneExempt: true,
	})
	ctx := context.Background()
	projectID := int64(888)

	// 记录一项里程碑决策 (不衰减)
	milestone, _ := mgr.RecordActivity(ctx, projectID, 1, "张工", "decision", "通过V0.5阶段可行性初审", nil, 1.0, true)

	// 记录一项 14 天前的日常协同讨论 (经历 2 个半衰期)
	oldOp, _ := mgr.RecordActivity(ctx, projectID, 2, "李工", "operation", "日常测试参数备选记录", nil, 1.0, false)
	oldOp.CreatedAt = time.Now().Add(-14 * 24 * time.Hour)

	// 更新内存中的活动列表时间以供测试排序
	mgr.mu.Lock()
	for i := range mgr.activities[projectID] {
		if mgr.activities[projectID][i].ID == oldOp.ID {
			mgr.activities[projectID][i].CreatedAt = oldOp.CreatedAt
		}
	}
	mgr.mu.Unlock()

	pCtx, err := mgr.GetProjectContext(ctx, projectID)
	if err != nil {
		t.Fatalf("get project context failed: %v", err)
	}

	if len(pCtx.AllActivities) < 2 {
		t.Fatalf("expected 2 activities, got %d", len(pCtx.AllActivities))
	}

	// 里程碑事件排在最前且权重维持 1.0
	if pCtx.AllActivities[0].ID != milestone.ID {
		t.Errorf("expected milestone to rank highest, got ID %d", pCtx.AllActivities[0].ID)
	}
	if pCtx.AllActivities[0].DecayedWeight != 1.0 {
		t.Errorf("expected milestone weight 1.0, got %.2f", pCtx.AllActivities[0].DecayedWeight)
	}

	// 14 天前的旧操作权重应衰减至 0.25 左右
	if pCtx.AllActivities[1].DecayedWeight > 0.30 {
		t.Errorf("expected old op decayed below 0.30, got %.3f", pCtx.AllActivities[1].DecayedWeight)
	}
}

func TestContextManager_DatabaseIntegration(t *testing.T) {
	dsn := os.Getenv("CONTEXT_DB_DSN")
	if dsn == "" {
		dsn = db.SkipIfNoTestDatabaseURL(t)
	}

	ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
	defer cancel()

	pool, err := pgxpool.New(ctx, dsn)
	if err != nil {
		t.Skipf("cannot connect to context db (%v), skipping DB test", err)
		return
	}
	defer pool.Close()

	if err := pool.Ping(ctx); err != nil {
		t.Skipf("context db ping failed (%v), skipping DB test", err)
		return
	}

	if err := db.RunMigrationsOnceForTest(ctx, pool, dsn); err != nil {
		t.Fatalf("migration failed: %v", err)
	}

	mgr := NewContextManager(pool, nil, DefaultTimeDecayConfig())

	// 准备真实项目与用户
	var projID int64
	projCode := "PROJ_MGR_" + time.Now().Format("20060102150405")
	projName := "智能微创内窥镜-" + time.Now().Format("150405.000")
	err = pool.QueryRow(ctx, `
		INSERT INTO projects (code, name, customer_name, device_type, current_stage)
		VALUES ($1, $2, '水木创新中心', '内窥镜', 'V0.5_feasibility')
		RETURNING id
	`, projCode, projName).Scan(&projID)
	if err != nil {
		t.Fatalf("insert project failed: %v", err)
	}

	var userID int64
	accountID := "acc_mgr_" + time.Now().Format("150405")
	err = pool.QueryRow(ctx, `
		INSERT INTO users (account_id, name, role)
		VALUES ($1, '首席法规官', 'regulatory')
		RETURNING id
	`, accountID).Scan(&userID)
	if err != nil {
		t.Fatalf("insert user failed: %v", err)
	}

	sessID := "sess_db_" + time.Now().Format("150405")
	_ = mgr.RecordUserMessage(ctx, sessID, userID, "user", "请简短汇报，结论先行，关注NMPA注册进度和排期。", "QUERY_PROGRESS", "PREEMPT", nil)
	_ = mgr.RecordUserMessage(ctx, sessID, userID, "assistant", "已为您梳理完成，当前已完成法规初筛。", "", "", nil)

	_, err = mgr.RecordActivity(ctx, projID, userID, "首席法规官", "decision", "选定注册检验所并锁定型检方案", nil, 1.0, true)
	if err != nil {
		t.Fatalf("record activity in db failed: %v", err)
	}

	// 验证单用户上下文读取
	uCtx, err := mgr.GetUserContext(ctx, projID, userID, sessID)
	if err != nil {
		t.Fatalf("get user context from db failed: %v", err)
	}
	if len(uCtx.RecentChats) < 2 {
		t.Errorf("expected at least 2 chat messages in db, got %d", len(uCtx.RecentChats))
	}
	if uCtx.Preference.CommunicationStyle != StyleConciseStructured {
		t.Errorf("expected preference StyleConciseStructured in db, got %s", uCtx.Preference.CommunicationStyle)
	}

	// 验证项目级上下文读取
	pCtx, err := mgr.GetProjectContext(ctx, projID)
	if err != nil {
		t.Fatalf("get project context from db failed: %v", err)
	}
	if len(pCtx.MilestoneDecisions) == 0 {
		t.Errorf("expected milestone decisions in db, got 0")
	}

	// 验证混合上下文装配
	blended, err := mgr.BuildBlendedSquadContext(ctx, projID, userID, "feasibility_reg", "regulatory")
	if err != nil {
		t.Fatalf("build blended context failed: %v", err)
	}
	if !strings.Contains(blended.PersonalizedGuidance, "结构精炼、结论先行") {
		t.Errorf("blended context missing user personalized guidance: %s", blended.PersonalizedGuidance)
	}
}