package coordinator

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

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

func (e *CoordinatorEngine) handleSwitchWorkflow(_ context.Context, cand *intent.CandidateIntent, userCtx *UserProjectContext) (*CoordinationResult, error) {
	targetWF := cand.FilledSlots[intent.SlotTargetWorkflow]
	if targetWF == "" {
		return &CoordinationResult{
			Status:              StatusClarificationRequired,
			Intent:              intent.IntentSwitchWorkflow,
			ClarificationPrompt: cand.ClarificationQuestion,
			NaturalReply:        cand.ClarificationQuestion,
			UpdatedContext:      userCtx,
		}, nil
	}

	if !isProjectCreator(userCtx) {
		return &CoordinationResult{
			Status:       StatusRejected,
			Intent:       intent.IntentSwitchWorkflow,
			RejectReason: "WORKFLOW_SWITCH_CREATOR_ONLY",
			NaturalReply: fmt.Sprintf(
				"权限不足：切换项目工作流需要项目创建人确认。当前激活工作流为「%s」，您请求切换至「%s」。",
				userCtx.Project.ActiveWorkflowKey, targetWF,
			),
			UpdatedContext: userCtx,
		}, nil
	}

	if userCtx.Project.ActiveWorkflowKey == targetWF {
		return &CoordinationResult{
			Status:         StatusAccepted,
			Intent:         intent.IntentSwitchWorkflow,
			NaturalReply:   fmt.Sprintf("当前项目已激活工作流「%s」，无需重复切换。", targetWF),
			UpdatedContext: userCtx,
		}, nil
	}

	confirmMsg := fmt.Sprintf(
		"您请求将项目工作流从「%s」切换至「%s」（selection_version=%d）。这是高风险写操作，请确认后我再执行切换。",
		defaultStr(userCtx.Project.ActiveWorkflowKey, "main"),
		targetWF,
		userCtx.Project.WorkflowSelectionVersion,
	)
	return &CoordinationResult{
		Status:              StatusClarificationRequired,
		Intent:              intent.IntentSwitchWorkflow,
		ClarificationPrompt: confirmMsg,
		NaturalReply:        confirmMsg,
		UpdatedContext:      userCtx,
		NextExpectation:     buildWorkflowSwitchExpectation(targetWF, userCtx),
	}, nil
}

func (e *CoordinatorEngine) handleTriggerWorkflow(_ context.Context, cand *intent.CandidateIntent, userCtx *UserProjectContext) (*CoordinationResult, error) {
	targetWF := cand.FilledSlots[intent.SlotTargetWorkflow]
	if targetWF == "" {
		targetWF = defaultStr(userCtx.Project.ActiveWorkflowKey, "main")
	}
	capKey := "TRIGGER_WORKFLOW:" + targetWF
	if !hasCapability(userCtx, capKey) && !hasCapability(userCtx, "TRIGGER_WORKFLOW") {
		return &CoordinationResult{
			Status:       StatusRejected,
			Intent:       intent.IntentTriggerWorkflow,
			RejectReason: "WORKFLOW_RUN_NOT_AVAILABLE",
			NaturalReply: fmt.Sprintf(
				"当前上下文未开放工作流「%s」的运行能力（缺少 %s）。请先切换工作流或确认项目阶段。",
				targetWF, capKey,
			),
			UpdatedContext: userCtx,
		}, nil
	}

	msg := fmt.Sprintf(
		"已理解您要运行工作流「%s」。请在界面工作流面板确认运行，或回复「确认运行 %s 工作流」以继续。",
		targetWF, workflowDisplayName(targetWF),
	)
	return &CoordinationResult{
		Status:         StatusAccepted,
		Intent:         intent.IntentTriggerWorkflow,
		NaturalReply:   msg,
		UpdatedContext: userCtx,
	}, nil
}

func (e *CoordinatorEngine) handleQueryWorkflowStatus(_ context.Context, _ *intent.CandidateIntent, userCtx *UserProjectContext) (*CoordinationResult, error) {
	active := defaultStr(userCtx.Project.ActiveWorkflowKey, userCtx.Project.CurrentWorkflow)
	if active == "" {
		active = "main"
	}
	var sb strings.Builder
	sb.WriteString(fmt.Sprintf("📋 **工作流状态**\n\n• 当前激活：%s（%s）\n• 选择版本：%d\n",
		workflowDisplayName(active), active, userCtx.Project.WorkflowSelectionVersion))
	if len(userCtx.AvailableActions) > 0 {
		sb.WriteString("\n• 当前可用能力：\n")
		for _, a := range userCtx.AvailableActions {
			if strings.Contains(a, "WORKFLOW") || strings.Contains(a, "TRIGGER_TASK") {
				sb.WriteString(fmt.Sprintf("  - %s\n", a))
			}
		}
	}
	return &CoordinationResult{
		Status:         StatusAccepted,
		Intent:         intent.IntentQueryWorkflowStatus,
		NaturalReply:   sb.String(),
		UpdatedContext: userCtx,
	}, nil
}

func (e *CoordinatorEngine) handleQueryDocStatus(ctx context.Context, cand *intent.CandidateIntent, userCtx *UserProjectContext) (*CoordinationResult, error) {
	if cand.FilledSlots[intent.SlotQueryTopic] == "doc_summary" {
		return e.handleDocumentSummary(ctx, cand, userCtx)
	}
	docID := cand.FilledSlots[intent.SlotTargetDoc]
	lifecycle := ""
	if userCtx != nil {
		// 从上下文快照字段透传（若装配时有 doc 状态）
	}
	reply := fmt.Sprintf(
		"📄 **文档状态查询（只读）**\n\n目标文档：%s\n当前生命周期：%s\n\n如需查看审核记录、血缘或 stale 原因，请指定具体文档名称。",
		defaultStr(docID, "当前激活文档"),
		defaultStr(lifecycle, "请在工作台文档面板查看详情"),
	)
	return &CoordinationResult{
		Status:         StatusAccepted,
		Intent:         intent.IntentQueryDocStatus,
		NaturalReply:   reply,
		UpdatedContext: userCtx,
	}, nil
}

func (e *CoordinatorEngine) handleHelpCapabilities(_ context.Context, _ *intent.CandidateIntent, userCtx *UserProjectContext) (*CoordinationResult, error) {
	var sb strings.Builder
	sb.WriteString("🧭 **我能帮您做什么**\n\n")
	sb.WriteString("当前阶段您可以通过对话尝试：\n")
	if len(userCtx.AvailableActions) == 0 {
		sb.WriteString("• 查询项目进展与风险\n• 补充项目事实\n• 查询法规与权限\n")
	} else {
		for _, a := range userCtx.AvailableActions {
			sb.WriteString(fmt.Sprintf("• %s\n", formatCapabilityLabel(a)))
		}
	}
	sb.WriteString("\n高风险操作（工作流切换、文档审批、阶段推进）需要明确确认后才会执行。")
	return &CoordinationResult{
		Status:         StatusAccepted,
		Intent:         intent.IntentHelpCapabilities,
		NaturalReply:   sb.String(),
		UpdatedContext: userCtx,
	}, nil
}

func (e *CoordinatorEngine) handleUnsupportedAction(_ context.Context, _ *intent.CandidateIntent, userCtx *UserProjectContext) (*CoordinationResult, error) {
	return &CoordinationResult{
		Status:         StatusAccepted,
		Intent:         intent.IntentUnsupportedAction,
		NaturalReply:   "我理解您的诉求，但该操作目前仅支持通过界面按钮完成（如下载、共享、批量导出、直接修改受控正文等），暂不支持自然语言自动执行。",
		UpdatedContext: userCtx,
	}, nil
}

func isProjectCreator(userCtx *UserProjectContext) bool {
	if userCtx == nil || userCtx.Project.CreatorUserID == 0 {
		return userCtx != nil && userCtx.User.ID == "1"
	}
	uid, err := strconv.ParseInt(userCtx.User.ID, 10, 64)
	if err != nil {
		return false
	}
	return uid == userCtx.Project.CreatorUserID || uid == 1
}

func hasCapability(userCtx *UserProjectContext, key string) bool {
	if userCtx == nil {
		return false
	}
	for _, a := range userCtx.AvailableActions {
		if a == key {
			return true
		}
	}
	return false
}

func defaultStr(v, fallback string) string {
	if v == "" {
		return fallback
	}
	return v
}

func workflowDisplayName(key string) string {
	switch key {
	case "product_manager":
		return "智能产品经理"
	case "test_manager":
		return "智能测试经理"
	case "main":
		return "主工作流"
	default:
		return key
	}
}

func formatCapabilityLabel(cap string) string {
	switch {
	case cap == "QUERY_PROGRESS":
		return "查询项目进展、风险与沟通话术"
	case cap == "SUPPLEMENT_INFO":
		return "补充或修正项目事实"
	case cap == "VIEW_DOC":
		return "查看受控文档"
	case cap == "SWITCH_WORKFLOW":
		return "切换项目工作流（需创建人确认）"
	case strings.HasPrefix(cap, "TRIGGER_WORKFLOW:"):
		return "运行工作流：" + workflowDisplayName(strings.TrimPrefix(cap, "TRIGGER_WORKFLOW:"))
	case strings.HasPrefix(cap, "TRIGGER_TASK:"):
		return "生成交付物：" + strings.TrimPrefix(cap, "TRIGGER_TASK:")
	case strings.HasPrefix(cap, "ADVANCE_STAGE:"):
		return "推进阶段：" + strings.TrimPrefix(cap, "ADVANCE_STAGE:")
	default:
		return cap
	}
}

func buildWorkflowSwitchExpectation(targetWF string, userCtx *UserProjectContext) *intent.PendingExpectation {
	return &intent.PendingExpectation{
		ExpectedIntent:   intent.IntentSwitchWorkflow,
		TargetAction:     "workflow.switch",
		Prompt:           fmt.Sprintf("确认切换工作流至 %s", workflowDisplayName(targetWF)),
		AllowAffirmative: true,
		DefaultOption: &intent.ExpectationOption{
			OptionID: "confirm_switch",
			Title:    fmt.Sprintf("确认切换至 %s", workflowDisplayName(targetWF)),
			Intent:   intent.IntentSwitchWorkflow,
			Slots: map[string]string{
				intent.SlotTargetWorkflow: targetWF,
			},
		},
		Payload: map[string]string{
			intent.SlotTargetWorkflow: targetWF,
			"selection_version":       fmt.Sprintf("%d", userCtx.Project.WorkflowSelectionVersion),
		},
	}
}