package squadadapter

import (
	"fmt"
	"math"
	"os"
	"path/filepath"
	"strings"

	agentllm "agent-native/runtime/llm"
	"agent-native/runtime/tools"
	nativeadp "agent-squad/adapters/native"
	"agent-squad/squad"
	"agent-system-backend/internal/quality"
)

// EntryOptions 是小队作为对话入口时的一次运行参数。
type EntryOptions struct {
	DataDir      string
	Goal         string
	HostTools    []tools.Tool
	OnEvent      func(ev squad.ProcessEvent)
	Stream       agentllm.StreamFunc
	Router       squad.Router
	Checker      squad.Checker
	Hitl         squad.HitlPolicy
	MaxTurns     int
	MaxToolCalls int
	RepairBudget int
	// Model 是本次运行的主模型（与 AgentNativeOptions 解析出的路由同源：
	// 同一份运行快照 + 画像覆盖），不得与工厂配的端点/密钥分属不同属主。
	Model string
}

// EntryResult 是入口跑完后的文本。工件登记由调用方在虚假交付检查之后做。
type EntryResult struct {
	Summary string
	Body    string
	Name    string
}

// RunEntry 用小队引擎跑完一条用户目标。简单任务是单步 assistant，复杂任务进 leader。
// 每一步都走 agent-native 内核。
func RunEntry(rc Ctx, opt EntryOptions) (EntryResult, error) {
	if strings.TrimSpace(opt.Goal) == "" {
		return EntryResult{}, fmt.Errorf("squad entry: goal text is empty")
	}
	cfg, enabled := nativeadp.Config{}, false
	if AgentNativeOptions != nil {
		cfg, enabled = AgentNativeOptions(rc)
	}
	if opt.Model != "" {
		cfg.DefaultModel = opt.Model
	}
	if opt.Stream != nil {
		cfg.Stream = opt.Stream
		if cfg.DefaultModel == "" {
			cfg.DefaultModel = "test"
		}
		enabled = true
	}
	if !enabled || cfg.DefaultModel == "" {
		return EntryResult{}, fmt.Errorf("squad entry: 主模型未配置")
	}
	cfg.HostTools = opt.HostTools
	cfg.OnEvent = opt.OnEvent
	if opt.MaxTurns > 0 {
		cfg.MaxTurns = opt.MaxTurns
	}
	if cfg.MaxTurns <= 0 {
		cfg.MaxTurns = math.MaxInt32
	}
	cfg.MaxToolCalls = opt.MaxToolCalls

	hostNames := make([]string, 0, len(opt.HostTools))
	for _, tool := range opt.HostTools {
		hostNames = append(hostNames, tool.Name())
	}
	registry := squad.NewRoleRegistry()
	projectRun := rc.Run().ProjectID != ""
	for _, role := range kernelRoles(roleCaps{
		host: hostNames, exec: cfg.Exec != nil, skills: len(cfg.SkillsRoots) > 0,
		search: cfg.Search != nil, fetch: cfg.Fetch != nil, workspace: !projectRun,
	}) {
		if err := registry.Register(role); err != nil {
			return EntryResult{}, fmt.Errorf("squad entry: register %s: %w", role.Role, err)
		}
	}
	backends := BuildBackends(rc)
	nativeadp.RegisterFull(backends, cfg)

	checker := opt.Checker
	if checker == nil {
		checker = quality.Checker{}
	}
	repair := opt.RepairBudget
	if repair <= 0 {
		repair = 2
	}
	runDir := filepath.Join(opt.DataDir, "squad-entry", rc.Run().ID)
	engine, err := squad.NewEngine(squad.Options{
		DataDir:        runDir,
		Registry:       registry,
		Planner:        squad.NewRulePlanner(),
		Backends:       backends,
		DefaultBackend: "agent-native",
		StepTimeout:    -1, // 负数 = 不设单步截止（引擎只在 0 时回落到 10 分钟）
		HitlPolicy:     opt.Hitl,
		Checker:        checker,
		RepairBudget:   repair,
		Router:         opt.Router,
		Sink:           squad.ProgressFunc(func(ev squad.Event) { onSquadEvent(rc, ev) }),
	})
	if err != nil {
		return EntryResult{}, fmt.Errorf("squad entry: engine: %w", err)
	}

	res, err := engine.Run(rc.Context(), squad.Goal{Text: opt.Goal}, squad.RunOptions{})
	for err == nil && res != nil && !squad.RunStatus(res.Status).Terminal() {
		switch {
		case isHoldStatus(string(res.Status)):
			req := res.Pending
			if req == nil {
				if req, err = engine.Pending(res.RunID); err != nil || req == nil {
					break
				}
			}
			decision, aerr := askHuman(rc, req)
			if aerr != nil {
				return EntryResult{}, aerr
			}
			res, err = engine.Respond(rc.Context(), res.RunID, decision)
		default:
			res, err = engine.Resume(rc.Context(), res.RunID)
		}
		if err != nil {
			break
		}
		if res.Plan != nil {
			_ = rc.UpdatePlan(mapPlan(res.Plan))
		}
	}
	if err != nil {
		return EntryResult{}, fmt.Errorf("squad entry: %w", err)
	}
	if res == nil {
		return EntryResult{}, fmt.Errorf("squad entry: empty result")
	}
	if res.Plan != nil {
		_ = rc.UpdatePlan(mapPlan(res.Plan))
	}
	if res.Status != squad.RunCompleted && res.Status != squad.RunDegraded {
		return EntryResult{Summary: res.Summary}, fmt.Errorf("squad entry: status %s: %s", res.Status, res.Error)
	}
	name := "squad-entry.md"
	if res.Deliverable != "" && !strings.Contains(res.Deliverable, "..") {
		name = filepath.Base(res.Deliverable)
	}
	return EntryResult{Summary: res.Summary, Body: readDeliverable(res), Name: name}, nil
}

func readDeliverable(res *squad.RunResult) string {
	if res.WorkDir != "" && res.Deliverable != "" && !strings.Contains(res.Deliverable, "..") {
		path := filepath.Join(res.WorkDir, filepath.FromSlash(res.Deliverable))
		if b, err := os.ReadFile(path); err == nil {
			return string(b)
		}
	}
	return res.Deliverable
}

type roleCaps struct {
	host      []string
	exec      bool
	skills    bool
	search    bool
	fetch     bool
	workspace bool
}

func kernelRoles(caps roleCaps) []squad.RoleSpec {
	base := []string{}
	if caps.workspace {
		base = []string{"read_file", "write_file", "list_dir", "grep"}
	}
	writerTools := append([]string{}, base...)
	writerTools = append(writerTools, "edit_file", "multi_edit", "glob")
	if caps.exec {
		writerTools = append(writerTools, "run_python", "run_command")
	}
	if caps.skills {
		writerTools = append(writerTools, "load_skill")
	}
	writerTools = append(writerTools, caps.host...)
	research := append([]string{}, base...)
	if caps.search {
		research = append(research, "web_search")
	}
	if caps.fetch {
		research = append(research, "fetch_url")
	}
	instr := func(kind, fallback string) string {
		if RoleInstructions != nil {
			if body, ok := RoleInstructions(kind); ok && strings.TrimSpace(body) != "" {
				return body
			}
		}
		return fallback
	}
	writerBash := squad.BashPermissionDeny
	if caps.exec {
		writerBash = squad.BashPermissionAsk
	}
	writerSkills := []string(nil)
	if caps.skills {
		writerSkills = []string{"docx-author", "xlsx-author", "pptx-author"}
	}
	return []squad.RoleSpec{
		{Role: "leader", Name: "组长", Backend: "agent-native", BashPermission: squad.BashPermissionDeny,
			Tools: []string{"read_file", "write_file"}, Instructions: instr("leader", "先判断任务该直通还是拆开。复杂任务每次只委派一个成员，并写明技能与最低分。")},
		{Role: "assistant", Name: "助手", Backend: "agent-native", BashPermission: writerBash,
			Tools: writerTools, Skills: writerSkills,
			Instructions: instr("assistant", "直接完成用户的这一件事。需要成文时按交付物工作流生成并登记，不要只在回复里声称文件已生成。")},
		{Role: "planner", Name: "规划员", Backend: "agent-native", BashPermission: squad.BashPermissionDeny,
			Tools: base, Instructions: instr("planner", "梳理目标与材料，产出结构化要点与执行建议。")},
		{Role: "researcher", Name: "调研员", Backend: "agent-native", BashPermission: squad.BashPermissionDeny,
			Tools: research, Instructions: instr("researcher", "围绕目标调研关键问题，输出简明结论与依据。")},
		{Role: "writer", Name: "撰稿员", Backend: "agent-native", BashPermission: writerBash,
			Tools: writerTools, Skills: writerSkills, Instructions: instr("writer", "把前序要点与调研结论整理为清晰成文的交付文档。")},
		{Role: "analyst", Name: "分析员", Backend: "agent-native", BashPermission: squad.BashPermissionDeny,
			Tools:        append(append([]string{}, base...), caps.host...),
			Instructions: instr("analyst", "按现象、影响、隐性顾虑、建议四层写洞察。开头给一句话洞察，结尾给下一步行动。")},
		{Role: "reviewer", Name: "审校员", Backend: "agent-native", BashPermission: squad.BashPermissionDeny,
			Tools:        append(append([]string{}, base...), caps.host...),
			Instructions: instr("reviewer", "终审交付文档：一致性、完整性与风险提示，给出通过或修改意见。")},
	}
}