// Package tools wires the 8 dialectic_* tool implementations.
// Each tool is one HTTP call against Dialectic.Backend; errors come
// back as is_error=true ToolResult so the agent sees a usable message
// rather than an RPC failure.
package tools

import (
	"context"
	"encoding/json"
	"fmt"
	"net/url"
	"strconv"

	sdkplugin "git.hangman-lab.top/hzhang/Plexum-sdk-go/plugin"

	"git.hangman-lab.top/zhi/Dialectic.PlexumPlugin/internal/backend"
	"git.hangman-lab.top/zhi/Dialectic.PlexumPlugin/internal/config"
	"git.hangman-lab.top/zhi/Dialectic.PlexumPlugin/internal/hfprecheck"
)

type Deps struct {
	Config config.Resolved
	Host   sdkplugin.HostAPI

	// AgentIDFromCtx resolves the calling agent's id. v1: returns
	// config.DefaultAgentID (single-agent claws); multi-agent claws
	// must wait for SDK ctx plumbing — see ../../README.md.
	AgentIDFromCtx func(ctx context.Context) string
}

func Dispatch(ctx context.Context, deps Deps, name string, input json.RawMessage) (sdkplugin.ToolResult, error) {
	switch name {
	case "dialectic_list_topics":
		return toolListTopics(ctx, deps, input)
	case "dialectic_topic_detail":
		return toolTopicDetail(ctx, deps, input)
	case "dialectic_list_arguments":
		return toolListArguments(ctx, deps, input)
	case "dialectic_propose_topic":
		return toolProposeTopic(ctx, deps, input)
	case "dialectic_signup":
		return toolSignup(ctx, deps, input)
	case "dialectic_post_argument":
		return toolPostArgument(ctx, deps, input)
	case "dialectic_submit_verdict":
		return toolSubmitVerdict(ctx, deps, input)
	case "dialectic_view_verdict":
		return toolViewVerdict(ctx, deps, input)
	}
	return errResult("unknown tool: " + name), nil
}

// ---- helpers ----

func clientFor(deps Deps, agentID string) (*backend.Client, error) {
	key := deps.Config.ResolveAPIKey(agentID)
	if key == "" {
		return nil, fmt.Errorf("dialectic api key not configured for agent %q (set plugins.dialectic.config.apiKey or agentKeys[%q])", agentID, agentID)
	}
	return backend.New(deps.Config.BackendURL, key), nil
}

func okResult(body json.RawMessage) sdkplugin.ToolResult {
	if len(body) == 0 {
		return sdkplugin.NewTextResult("null")
	}
	return sdkplugin.NewTextResult(string(body))
}

func errResult(msg string) sdkplugin.ToolResult {
	return sdkplugin.ToolResult{
		IsError: true,
		Content: []sdkplugin.ContentBlock{{Type: "text", Text: "error: " + msg}},
	}
}

// ---- tools ----

type listTopicsIn struct {
	Status     string `json:"status,omitempty"`
	Visibility string `json:"visibility,omitempty"`
	Limit      *int   `json:"limit,omitempty"`
	Offset     *int   `json:"offset,omitempty"`
}

func toolListTopics(ctx context.Context, deps Deps, in json.RawMessage) (sdkplugin.ToolResult, error) {
	var p listTopicsIn
	if len(in) > 0 {
		if err := json.Unmarshal(in, &p); err != nil {
			return errResult("invalid input: " + err.Error()), nil
		}
	}
	cli, err := clientFor(deps, deps.AgentIDFromCtx(ctx))
	if err != nil {
		return errResult(err.Error()), nil
	}
	q := url.Values{}
	if p.Status != "" {
		q.Set("status", p.Status)
	}
	if p.Visibility != "" {
		q.Set("visibility", p.Visibility)
	}
	if p.Limit != nil {
		q.Set("limit", strconv.Itoa(*p.Limit))
	}
	if p.Offset != nil {
		q.Set("offset", strconv.Itoa(*p.Offset))
	}
	path := "/api/topics"
	if qs := q.Encode(); qs != "" {
		path += "?" + qs
	}
	raw, err := cli.Get(ctx, path)
	if err != nil {
		return errResult(err.Error()), nil
	}
	return okResult(raw), nil
}

type topicIDIn struct {
	TopicID string `json:"topic_id"`
}

func toolTopicDetail(ctx context.Context, deps Deps, in json.RawMessage) (sdkplugin.ToolResult, error) {
	var p topicIDIn
	if err := json.Unmarshal(in, &p); err != nil {
		return errResult("invalid input: " + err.Error()), nil
	}
	if p.TopicID == "" {
		return errResult("topic_id required"), nil
	}
	cli, err := clientFor(deps, deps.AgentIDFromCtx(ctx))
	if err != nil {
		return errResult(err.Error()), nil
	}
	raw, err := cli.Get(ctx, "/api/topics/"+url.PathEscape(p.TopicID))
	if err != nil {
		return errResult(err.Error()), nil
	}
	return okResult(raw), nil
}

func toolListArguments(ctx context.Context, deps Deps, in json.RawMessage) (sdkplugin.ToolResult, error) {
	var p topicIDIn
	if err := json.Unmarshal(in, &p); err != nil {
		return errResult("invalid input: " + err.Error()), nil
	}
	if p.TopicID == "" {
		return errResult("topic_id required"), nil
	}
	cli, err := clientFor(deps, deps.AgentIDFromCtx(ctx))
	if err != nil {
		return errResult(err.Error()), nil
	}
	raw, err := cli.Get(ctx, "/api/topics/"+url.PathEscape(p.TopicID)+"/arguments")
	if err != nil {
		return errResult(err.Error()), nil
	}
	return okResult(raw), nil
}

type proposeTopicIn struct {
	Title           string `json:"title"`
	Summary         string `json:"summary"`
	VerdictSchemaID string `json:"verdict_schema_id"`
	Visibility      string `json:"visibility,omitempty"`
	SignupOpenAt    string `json:"signup_open_at"`
	SignupCloseAt   string `json:"signup_close_at"`
	DebateStartAt   string `json:"debate_start_at"`
	DebateEndAt     string `json:"debate_end_at"`
}

func toolProposeTopic(ctx context.Context, deps Deps, in json.RawMessage) (sdkplugin.ToolResult, error) {
	var p proposeTopicIn
	if err := json.Unmarshal(in, &p); err != nil {
		return errResult("invalid input: " + err.Error()), nil
	}
	for k, v := range map[string]string{
		"title":             p.Title,
		"summary":           p.Summary,
		"verdict_schema_id": p.VerdictSchemaID,
		"signup_open_at":    p.SignupOpenAt,
		"signup_close_at":   p.SignupCloseAt,
		"debate_start_at":   p.DebateStartAt,
		"debate_end_at":     p.DebateEndAt,
	} {
		if v == "" {
			return errResult(k + " required"), nil
		}
	}
	cli, err := clientFor(deps, deps.AgentIDFromCtx(ctx))
	if err != nil {
		return errResult(err.Error()), nil
	}
	body := map[string]any{
		"title":             p.Title,
		"summary":           p.Summary,
		"verdict_schema_id": p.VerdictSchemaID,
		"signup_open_at":    p.SignupOpenAt,
		"signup_close_at":   p.SignupCloseAt,
		"debate_start_at":   p.DebateStartAt,
		"debate_end_at":     p.DebateEndAt,
	}
	if p.Visibility != "" {
		body["visibility"] = p.Visibility
	}
	raw, err := cli.Post(ctx, "/api/topics", body)
	if err != nil {
		return errResult(err.Error()), nil
	}
	return okResult(raw), nil
}

type signupIn struct {
	TopicID      string   `json:"topic_id"`
	WillingCamps []string `json:"willing_camps"`
}

func toolSignup(ctx context.Context, deps Deps, in json.RawMessage) (sdkplugin.ToolResult, error) {
	var p signupIn
	if err := json.Unmarshal(in, &p); err != nil {
		return errResult("invalid input: " + err.Error()), nil
	}
	if p.TopicID == "" {
		return errResult("topic_id required"), nil
	}
	if len(p.WillingCamps) == 0 {
		return errResult("willing_camps must have ≥1 entry"), nil
	}
	agentID := deps.AgentIDFromCtx(ctx)
	cli, err := clientFor(deps, agentID)
	if err != nil {
		return errResult(err.Error()), nil
	}

	// Fetch topic detail so we know the debate window for HF pre-check.
	rawTopic, err := cli.Get(ctx, "/api/topics/"+url.PathEscape(p.TopicID))
	if err != nil {
		return errResult("topic lookup: " + err.Error()), nil
	}
	var td backend.TopicDetail
	if err := json.Unmarshal(rawTopic, &td); err != nil {
		return errResult("topic lookup parse: " + err.Error()), nil
	}
	if td.DebateStartAt == "" || td.DebateEndAt == "" {
		return errResult("topic detail missing debate window timestamps"), nil
	}

	pre := hfprecheck.Check(agentID, td.DebateStartAt, td.DebateEndAt)
	if !pre.OK {
		return errResult("HF pre-check failed: " + pre.Reason), nil
	}

	body := map[string]any{
		"willing_camps": p.WillingCamps,
		"pre_validated": pre.Source == "hf",
	}
	raw, err := cli.Post(ctx, "/api/topics/"+url.PathEscape(p.TopicID)+"/signups", body)
	if err != nil {
		return errResult(err.Error()), nil
	}
	return okResult(raw), nil
}

type postArgumentIn struct {
	TopicID string `json:"topic_id"`
	Content string `json:"content"`
}

func toolPostArgument(ctx context.Context, deps Deps, in json.RawMessage) (sdkplugin.ToolResult, error) {
	var p postArgumentIn
	if err := json.Unmarshal(in, &p); err != nil {
		return errResult("invalid input: " + err.Error()), nil
	}
	if p.TopicID == "" {
		return errResult("topic_id required"), nil
	}
	if p.Content == "" {
		return errResult("content required"), nil
	}
	cli, err := clientFor(deps, deps.AgentIDFromCtx(ctx))
	if err != nil {
		return errResult(err.Error()), nil
	}
	raw, err := cli.Post(ctx, "/api/topics/"+url.PathEscape(p.TopicID)+"/arguments",
		map[string]any{"content": p.Content})
	if err != nil {
		return errResult(err.Error()), nil
	}
	return okResult(raw), nil
}

type submitVerdictIn struct {
	TopicID      string         `json:"topic_id"`
	Verdict      map[string]any `json:"verdict"`
	Rationale    string         `json:"rationale"`
	TokensInput  *int           `json:"tokens_input,omitempty"`
	TokensOutput *int           `json:"tokens_output,omitempty"`
}

func toolSubmitVerdict(ctx context.Context, deps Deps, in json.RawMessage) (sdkplugin.ToolResult, error) {
	var p submitVerdictIn
	if err := json.Unmarshal(in, &p); err != nil {
		return errResult("invalid input: " + err.Error()), nil
	}
	if p.TopicID == "" {
		return errResult("topic_id required"), nil
	}
	if p.Verdict == nil {
		return errResult("verdict required"), nil
	}
	if p.Rationale == "" {
		return errResult("rationale required"), nil
	}
	cli, err := clientFor(deps, deps.AgentIDFromCtx(ctx))
	if err != nil {
		return errResult(err.Error()), nil
	}
	body := map[string]any{
		"verdict":   p.Verdict,
		"rationale": p.Rationale,
	}
	if p.TokensInput != nil {
		body["tokens_input"] = *p.TokensInput
	}
	if p.TokensOutput != nil {
		body["tokens_output"] = *p.TokensOutput
	}
	raw, err := cli.Post(ctx, "/api/topics/"+url.PathEscape(p.TopicID)+"/verdict", body)
	if err != nil {
		return errResult(err.Error()), nil
	}
	return okResult(raw), nil
}

func toolViewVerdict(ctx context.Context, deps Deps, in json.RawMessage) (sdkplugin.ToolResult, error) {
	var p topicIDIn
	if err := json.Unmarshal(in, &p); err != nil {
		return errResult("invalid input: " + err.Error()), nil
	}
	if p.TopicID == "" {
		return errResult("topic_id required"), nil
	}
	cli, err := clientFor(deps, deps.AgentIDFromCtx(ctx))
	if err != nil {
		return errResult(err.Error()), nil
	}
	raw, err := cli.Get(ctx, "/api/topics/"+url.PathEscape(p.TopicID)+"/verdict")
	if err != nil {
		return errResult(err.Error()), nil
	}
	return okResult(raw), nil
}