package service

import (
	"crypto/rand"
	"encoding/hex"
	"strconv"
	"strings"

	"git.gozeros.com/wsk/eightbf-analysis-go/internal/domain"
	"git.gozeros.com/wsk/eightbf-analysis-go/internal/repo"
)

// CreateJobRequest 创建会商作业入参。
type CreateJobRequest struct {
	RequestID          string                   `json:"requestId"`
	TaskID             string                   `json:"taskId"`
	DraftID            string                   `json:"draftId"`
	DraftKey           string                   `json:"draftKey"`
	Model              string                   `json:"model"`
	OrchestrationMode  string                   `json:"orchestrationMode"`
	Title              string                   `json:"title"`
	Description        string                   `json:"description"`
	OwnerAccountID     string                   `json:"ownerAccountId"`
	ManualIntervention *bool                    `json:"manualIntervention"`
	Agents             []map[string]interface{} `json:"agents"`
	Payload            map[string]interface{}   `json:"payload"`
	Access             map[string]interface{}   `json:"access"`
}

type ResumeJobRequest struct {
	Answer string `json:"answer"`
	Reason string `json:"reason"`
}

type PatchJobPlanRequest struct {
	ManualIntervention *bool  `json:"manualIntervention"`
	Model              *string `json:"model"`
}

type InjectJobRequest struct {
	Text string `json:"text"`
}

// JobService 会商作业编排（不直接调大模型）。
type JobService struct {
	Repo   *repo.JobRepo
	Access *AccessService
}

func (s *JobService) Create(req *CreateJobRequest, caller Caller) (*domain.AnalysisJob, error) {
	if req == nil {
		req = &CreateJobRequest{}
	}
	manual := true
	if req.ManualIntervention != nil {
		manual = *req.ManualIntervention
	}
	owner := blankToNull(req.OwnerAccountID)
	if owner == "" && caller.AccountID != "" {
		owner = caller.AccountID
	}
	mode := blankToNull(req.OrchestrationMode)
	if mode == "" {
		mode = "roundtable"
	}
	job := &domain.AnalysisJob{
		ID:                  "job_" + randHex(8),
		RequestID:           firstNonEmpty(blankToNull(req.RequestID), "req_"+randHex(6)),
		TaskID:              blankToNull(req.TaskID),
		DraftID:             blankToNull(req.DraftID),
		DraftKey:            blankToNull(req.DraftKey),
		Status:              domain.StatusQueued,
		Phase:               "queued",
		OrchestrationMode:   mode,
		Model:               strings.TrimSpace(req.Model),
		OwnerAccountID:      owner,
		Agents:              normalizeAgents(req.Agents),
		Dialogues:           []map[string]interface{}{},
		Access:              orEmptyMap(req.Access),
		Plan: map[string]interface{}{
			"seatIndex":          0,
			"manualIntervention": manual,
			"seedMessage":        nil,
			"pendingInject":      nil,
			"awaitReason":        nil,
		},
		Progress: map[string]interface{}{
			"percent":     0,
			"message":     "queued",
			"title":       req.Title,
			"description": req.Description,
		},
	}
	if req.Payload != nil {
		job.Progress["payload"] = req.Payload
	}
	if err := s.Repo.Insert(job); err != nil {
		return nil, err
	}
	return s.Access.ProjectForCaller(job, caller), nil
}

func (s *JobService) Get(id string, caller Caller) (*domain.AnalysisJob, error) {
	job, err := s.Repo.FindByID(id)
	if err != nil || job == nil {
		return job, err
	}
	if !s.Access.CanRead(job, caller) {
		return nil, Forbidden("无权查看该会商作业")
	}
	return s.Access.ProjectForCaller(job, caller), nil
}

func (s *JobService) GetByTaskID(taskID string, latestOnly bool, caller Caller) (*domain.AnalysisJob, error) {
	var job *domain.AnalysisJob
	var err error
	if latestOnly {
		job, err = s.Repo.FindLatestByTaskID(taskID)
	} else {
		job, err = s.Repo.FindActiveByTaskID(taskID)
		if err == nil && job == nil {
			job, err = s.Repo.FindLatestByTaskID(taskID)
		}
	}
	if err != nil || job == nil {
		return job, err
	}
	if !s.Access.CanRead(job, caller) {
		return nil, Forbidden("无权查看该会商作业")
	}
	return s.Access.ProjectForCaller(job, caller), nil
}

func (s *JobService) Cancel(id string, caller Caller) (*domain.AnalysisJob, error) {
	job, err := s.Repo.FindByID(id)
	if err != nil || job == nil {
		return job, err
	}
	if !s.Access.CanCancel(job, caller) {
		return nil, Forbidden("无权取消该会商作业（仅任务责任人/创建人/管理员）")
	}
	if domain.IsTerminal(job.Status) {
		return s.Access.ProjectForCaller(job, caller), nil
	}
	_, _ = s.Repo.MarkCancel(id)
	job.Status = domain.StatusCancelled
	job.Phase = "cancelled"
	job.Error = "cancelled by client"
	p := job.EnsureProgress()
	p["message"] = "cancelled"
	if err := s.Repo.UpdateProgress(job); err != nil {
		return nil, err
	}
	return s.Access.ProjectForCaller(job, caller), nil
}

func (s *JobService) Resume(id string, body *ResumeJobRequest, caller Caller) (*domain.AnalysisJob, error) {
	job, err := s.Repo.FindByID(id)
	if err != nil || job == nil {
		return job, err
	}
	if !s.Access.CanMutate(job, caller) {
		return nil, Forbidden("无权续跑该会商作业")
	}
	if job.Status != domain.StatusAwaitingInput {
		return nil, BadState("当前状态不是等待输入，无法 resume（status=" + job.Status + ")")
	}
	answer := ""
	if body != nil {
		answer = strings.TrimSpace(body.Answer)
	}
	plan := job.EnsurePlan()
	if answer != "" {
		appendUserDialogue(job, answer)
		prev := asStr(plan["pendingInject"])
		merged := answer
		if strings.TrimSpace(prev) != "" {
			merged = prev + "\n\n" + answer
		}
		plan["pendingInject"] = "用户对澄清的回复：\n" + merged
	}
	plan["awaitReason"] = nil
	job.PendingClarification = ""
	job.Status = domain.StatusQueued
	job.Phase = "resume_queued"
	p := job.EnsureProgress()
	p["message"] = "已收到补充，准备继续"
	if err := s.Repo.UpdateProgress(job); err != nil {
		return nil, err
	}
	fresh, err := s.Repo.FindByID(id)
	if err != nil {
		return nil, err
	}
	return s.Access.ProjectForCaller(fresh, caller), nil
}

func (s *JobService) PatchPlan(id string, body *PatchJobPlanRequest, caller Caller) (*domain.AnalysisJob, error) {
	job, err := s.Repo.FindByID(id)
	if err != nil || job == nil {
		return job, err
	}
	if !s.Access.CanMutate(job, caller) {
		return nil, Forbidden("无权修改该会商作业设置")
	}
	if domain.IsTerminal(job.Status) {
		return nil, BadState("作业已结束，无法修改设置")
	}
	if body == nil {
		return s.Access.ProjectForCaller(job, caller), nil
	}
	touched := false
	plan := job.EnsurePlan()
	progress := job.EnsureProgress()
	if body.Model != nil {
		model := strings.TrimSpace(*body.Model)
		job.Model = model
		if model == "" {
			progress["message"] = "已清除模型指定（用默认）"
		} else {
			progress["message"] = "已切换模型为 " + model
		}
		touched = true
	}
	if body.ManualIntervention != nil {
		manual := *body.ManualIntervention
		plan["manualIntervention"] = manual
		if manual {
			progress["message"] = "已开启人工干预（下一席结束后将等待确认）"
		} else {
			progress["message"] = "已关闭人工干预（将自动连跑）"
		}
		touched = true
		atGate := job.Status == domain.StatusAwaitingInput && asStr(plan["awaitReason"]) == "manual_continue"
		if !manual && atGate {
			plan["awaitReason"] = nil
			job.PendingClarification = ""
			job.Status = domain.StatusQueued
			job.Phase = "resume_queued"
			progress["message"] = "已关闭人工干预，自动继续下一席"
		}
	}
	if !touched {
		return s.Access.ProjectForCaller(job, caller), nil
	}
	if err := s.Repo.UpdateProgress(job); err != nil {
		return nil, err
	}
	fresh, err := s.Repo.FindByID(id)
	if err != nil {
		return nil, err
	}
	return s.Access.ProjectForCaller(fresh, caller), nil
}

func (s *JobService) Inject(id string, body *InjectJobRequest, caller Caller) (*domain.AnalysisJob, error) {
	job, err := s.Repo.FindByID(id)
	if err != nil || job == nil {
		return job, err
	}
	if !s.Access.CanMutate(job, caller) {
		return nil, Forbidden("无权向该会商注入消息")
	}
	text := ""
	if body != nil {
		text = strings.TrimSpace(body.Text)
	}
	if text == "" {
		return nil, BadArg("注入内容不能为空")
	}
	if domain.IsTerminal(job.Status) {
		return nil, BadState("作业已结束，无法注入")
	}
	appendUserDialogue(job, text)
	plan := job.EnsurePlan()
	prev := asStr(plan["pendingInject"])
	merged := text
	if strings.TrimSpace(prev) != "" {
		merged = prev + "\n\n" + text
	}
	plan["pendingInject"] = "用户向会商插入的补充说明：\n" + merged
	p := job.EnsureProgress()
	p["message"] = "已收到用户补充，将在下一轮派活时带入"
	if err := s.Repo.UpdateProgress(job); err != nil {
		return nil, err
	}
	fresh, err := s.Repo.FindByID(id)
	if err != nil {
		return nil, err
	}
	return s.Access.ProjectForCaller(fresh, caller), nil
}

func appendUserDialogue(job *domain.AnalysisJob, text string) {
	list := job.EnsureDialogues()
	bubble := map[string]interface{}{
		"id":         "dlg_" + job.ID + "_user_" + strconv.Itoa(len(list)+1),
		"role":       "user",
		"sender":     "我",
		"content":    text,
		"status":     "done",
		"phaseLabel": "",
	}
	job.Dialogues = append(list, bubble)
}

func normalizeAgents(agents []map[string]interface{}) []map[string]interface{} {
	if len(agents) > 0 {
		out := make([]map[string]interface{}, 0, len(agents))
		for _, a := range agents {
			copy := cloneMap(a)
			if _, ok := copy["id"]; !ok {
				if aid, ok := copy["agentId"]; ok {
					copy["id"] = aid
				}
			}
			if _, ok := copy["status"]; !ok {
				copy["status"] = "idle"
			}
			out = append(out, copy)
		}
		return out
	}
	return []map[string]interface{}{
		{"id": "local-flow-stub-intel", "name": "联调桩-情报采集", "status": "idle"},
		{"id": "local-flow-stub-plan", "name": "联调桩-筹划规划", "status": "idle"},
	}
}

func blankToNull(s string) string {
	return strings.TrimSpace(s)
}

func firstNonEmpty(a, b string) string {
	if a != "" {
		return a
	}
	return b
}

func orEmptyMap(m map[string]interface{}) map[string]interface{} {
	if m == nil {
		return map[string]interface{}{}
	}
	return m
}

func randHex(nBytes int) string {
	b := make([]byte, nBytes)
	_, _ = rand.Read(b)
	return hex.EncodeToString(b)
}