package app

import (
	"context"
	"errors"
	"fmt"
	"strconv"
	"strings"

	"chat-agent-system/internal/app/docnotify"
	"chat-agent-system/internal/contracts/vocabulary"
	"chat-agent-system/internal/coordinator"
	"chat-agent-system/internal/ctxmgr"
	"chat-agent-system/internal/docgov"
	"chat-agent-system/internal/projectinstance"
	"chat-agent-system/internal/traceimpact"
)

type traceRecheck struct{ svc *traceimpact.Service }

func (t traceRecheck) StageNeedsAck(ctx context.Context, projectID int64, stageKey string) (bool, error) {
	if t.svc == nil {
		return false, nil
	}
	return t.svc.NeedsRecheckAck(ctx, projectID, stageKey)
}

func (t traceRecheck) Acknowledge(ctx context.Context, projectID int64, stageKey string, userID int64) error {
	if t.svc == nil {
		return nil
	}
	return t.svc.AcknowledgeRecheck(ctx, projectID, stageKey, userID)
}

type traceStage struct{ inst *projectinstance.Service }

func (t traceStage) ReopenCompletedStage(ctx context.Context, instanceID int64, stageKey string, docTaskKeys []string, operatorID int64) error {
	if t.inst == nil {
		return fmt.Errorf("trace: instance service unavailable")
	}
	return t.inst.ReopenStage(ctx, instanceID, stageKey, docTaskKeys, operatorID)
}

type traceUnlock struct{ gov *docgov.GovernanceEngine }

func (t traceUnlock) ReopenApprovedDocs(ctx context.Context, projectID int64, docTaskKeys []string, actorID int64, reason string) error {
	if t.gov == nil {
		return nil
	}
	actorName := "reopen"
	if actorID > 0 {
		actorName = fmt.Sprintf("user:%d", actorID)
	}
	for _, key := range docTaskKeys {
		docID := fmt.Sprintf("doc_proj%d_%s", projectID, key)
		_, err := t.gov.ReopenForRevision(ctx, docID, actorID, actorName, reason)
		if err == nil || errors.Is(err, vocabulary.ErrDocumentNotFound) {
			continue
		}
		if errors.Is(err, vocabulary.ErrInvalidStateTransition) {
			continue
		}
		return err
	}
	return nil
}

type traceChat struct{ svc *traceimpact.Service }

func (t traceChat) AnalyzeImpact(ctx context.Context, projectID, userID int64, text string) (string, error) {
	if t.svc == nil {
		return "", fmt.Errorf("trace: unavailable")
	}
	ctx = traceimpact.WithActor(ctx, userID)
	rep, err := t.svc.Analyze(ctx, projectID, traceimpact.DocRef{DocID: "chat", Markdown: text, Visible: true}, nil)
	if err != nil {
		return "", err
	}
	return formatImpactReply(rep), nil
}

func formatImpactReply(rep *traceimpact.Report) string {
	if rep == nil || len(rep.Impacts) == 0 {
		if rep.Summary != "" {
			return rep.Summary
		}
		return "目前没有已确认的影响。可以说「分析影响」并带上条目编号，例如 UR-001。"
	}
	var b strings.Builder
	if rep.Summary != "" {
		b.WriteString(rep.Summary)
		b.WriteString("。")
	}
	limit := len(rep.Impacts)
	if limit > 8 {
		limit = 8
	}
	for i := 0; i < limit; i++ {
		imp := rep.Impacts[i]
		label := imp.ItemKey
		if label == "" {
			label = imp.DocID
		}
		if label == "" {
			continue
		}
		b.WriteString("\n- ")
		b.WriteString(label)
		if imp.Reason != "" {
			b.WriteString("：")
			b.WriteString(imp.Reason)
		}
	}
	if len(rep.Impacts) > limit {
		fmt.Fprintf(&b, "\n另有 %d 条未展开。", len(rep.Impacts)-limit)
	}
	return b.String()
}

func projectIDFromControlledDoc(docID string) int64 {
	rest := strings.TrimPrefix(docID, "doc_proj")
	if rest == docID {
		return 0
	}
	i := strings.Index(rest, "_")
	if i <= 0 {
		return 0
	}
	n, err := strconv.ParseInt(rest[:i], 10, 64)
	if err != nil {
		return 0
	}
	return n
}

func bindRecheckChat(svc *traceimpact.Service, chat *ctxmgr.ContextManager) {
	if svc == nil || chat == nil {
		return
	}
	svc.SetRecheckHook(func(ctx context.Context, mark traceimpact.RecheckMark) {
		userID := traceimpact.ActorID(ctx)
		reason := mark.Reason
		if reason == "" {
			reason = mark.SourceDoc
		}
		content := fmt.Sprintf("阶段 %s 待复核（%s）。需要细节可以说「分析影响」。", mark.StageKey, reason)
		card := map[string]any{
			"cardId":          fmt.Sprintf("recheck-%d", mark.ID),
			"cardType":        "RECHECK_NOTICE",
			"title":           "阶段待复核",
			"proposedContent": content,
			"status":          "active",
			"ttlTurns":        8,
			"actions": []any{
				map[string]any{
					"actionId": "recheck_no_change",
					"label":    "无需变更",
					"style":    "primary",
					"payload": map[string]string{
						"project_id": strconv.FormatInt(mark.ProjectID, 10),
						"mark_id":    strconv.FormatInt(mark.ID, 10),
					},
				},
			},
		}
		_ = docnotify.PostProjectNotice(ctx, chat, mark.ProjectID, userID, content, map[string]any{
			"interactive_card": card,
		})
	})
}
func (t traceChat) ProposeRevision(ctx context.Context, projectID, userID int64, text string, confirmed bool) (string, error) {
	if t.svc == nil {
		return "", fmt.Errorf("trace: unavailable")
	}
	id, err := t.svc.ProposeRevision(ctx, projectID, userID, text, confirmed)
	if errors.Is(err, traceimpact.ErrNeedsConfirm) {
		return "", coordinator.ErrImpactNeedsConfirm
	}
	return id, err
}