package coordinator

import (
	"context"
	"fmt"

	"chat-agent-system/internal/intent"
	"chat-agent-system/internal/projectinstance"
)

func (e *CoordinatorEngine) tryAdvanceWorkflowInstance(ctx context.Context, projectID int64, userID int64) (*CoordinationResult, bool, error) {
	if e == nil || e.instSvc == nil || !e.instSvc.Available() {
		return nil, false, nil
	}
	live, err := e.instSvc.GetSettings(ctx, projectID, userID, true)
	if err != nil || live == nil || live.LiveInstance == nil {
		return nil, false, nil
	}
	stageKey := live.ActiveStageKey
	if stageKey == "" {
		return nil, false, nil
	}
	readiness, err := e.instSvc.GetStageReadiness(ctx, live.LiveInstance.ID, stageKey, userID, true)
	if err != nil {
		return nil, true, err
	}
	if !readiness.Ready {
		return &CoordinationResult{
			Status:       StatusRejected,
			Intent:       intent.IntentAdvanceStage,
			RejectReason: "STAGE_GATE_NOT_READY",
			NaturalReply: fmt.Sprintf("当前阶段尚未满足推进条件，仍有 %d 项阻断。", len(readiness.BlockingIssues)),
		}, true, projectinstance.ErrStageGateNotReady
	}
	result, err := e.instSvc.AdvanceStage(ctx, live.LiveInstance.ID, userID, true, projectinstance.AdvanceStageInput{
		StageKey:               stageKey,
		ExpectedConfigRevision: readiness.ConfigRevision,
	})
	if err != nil {
		return nil, true, err
	}
	reply := fmt.Sprintf("已确认推进阶段【%s】。", stageKey)
	if result.InstanceDone {
		reply = "工作流已完成。您现在可以配置下一个工作流。"
	} else if result.NextStageKey != "" {
		reply = fmt.Sprintf("已确认推进至下一阶段【%s】。", result.NextStageKey)
	}
	return &CoordinationResult{
		Status:       StatusAccepted,
		Intent:       intent.IntentAdvanceStage,
		NaturalReply: reply,
	}, true, nil
}