// Copyright 2025 eat-pray-ai & OpenWaygate
// SPDX-License-Identifier: Apache-2.0

package commentThread

import (
	"bytes"
	"context"
	"encoding/json"
	"io"
	"log/slog"
	"time"

	"github.com/eat-pray-ai/yutu/cmd"
	"github.com/eat-pray-ai/yutu/pkg"
	"github.com/eat-pray-ai/yutu/pkg/commentThread"
	"github.com/google/jsonschema-go/jsonschema"
	"github.com/modelcontextprotocol/go-sdk/mcp"
	"github.com/spf13/cobra"
)

const (
	listTool     = "commentThread-list"
	listShort    = "List YouTube comment threads"
	listLong     = "List YouTube comment threads"
	listVidUsage = "Returns the comment threads of the specified video"
)

type listIn struct {
	Ids                          []string `json:"ids"`
	AllThreadsRelatedToChannelId string   `json:"allThreadsRelatedToChannelId"`
	ChannelId                    string   `json:"channelId"`
	MaxResults                   int64    `json:"maxResults"`
	ModerationStatus             string   `json:"moderationStatus"`
	Order                        string   `json:"order"`
	SearchTerms                  string   `json:"searchTerms"`
	TextFormat                   string   `json:"textFormat"`
	VideoId                      string   `json:"videoId"`
	Parts                        []string `json:"parts"`
	Output                       string   `json:"output"`
	Jsonpath                     string   `json:"jsonpath"`
}

var listInSchema = &jsonschema.Schema{
	Type: "object",
	Required: []string{
		"ids", "allThreadsRelatedToChannelId", "channelId", "maxResults",
		"moderationStatus", "order", "searchTerms", "textFormat",
		"videoId", "parts", "output", "jsonpath",
	},
	Properties: map[string]*jsonschema.Schema{
		"ids": {
			Type: "array", Items: &jsonschema.Schema{
				Type: "string",
			},
			Description: idsUsage,
			Default:     json.RawMessage(`[]`),
		},
		"allThreadsRelatedToChannelId": {
			Type: "string", Description: atrtcidUsage,
			Default: json.RawMessage(`""`),
		},
		"channelId": {
			Type: "string", Description: cidUsage,
			Default: json.RawMessage(`""`),
		},
		"maxResults": {
			Type: "number", Description: pkg.MRUsage,
			Default: json.RawMessage("5"),
			Minimum: jsonschema.Ptr(float64(0)),
		},
		"moderationStatus": {
			Type:        "string",
			Enum:        []any{"published", "heldForReview", "likelySpam", "rejected"},
			Description: msUsage, Default: json.RawMessage(`"published"`),
		},
		"order": {
			Type: "string", Enum: []any{"orderUnspecified", "time", "relevance"},
			Description: orderUsage, Default: json.RawMessage(`"time"`),
		},
		"searchTerms": {
			Type: "string", Description: stUsage,
			Default: json.RawMessage(`""`),
		},
		"textFormat": {
			Type: "string", Enum: []any{"textFormatUnspecified", "html"},
			Description: tfUsage, Default: json.RawMessage(`"html"`),
		},
		"videoId": {
			Type: "string", Description: listVidUsage,
			Default: json.RawMessage(`""`),
		},
		"parts": {
			Type: "array", Items: &jsonschema.Schema{
				Type: "string",
			},
			Description: pkg.PartsUsage,
			Default:     json.RawMessage(`["id","snippet"]`),
		},
		"output": {
			Type: "string", Enum: []any{"json", "yaml", "table"},
			Description: pkg.TableUsage, Default: json.RawMessage(`"yaml"`),
		},
		"jsonpath": {
			Type: "string", Description: pkg.JPUsage,
			Default: json.RawMessage(`""`),
		},
	},
}

func init() {
	mcp.AddTool(
		cmd.Server, &mcp.Tool{
			Name: listTool, Title: listShort, Description: listLong,
			InputSchema: listInSchema, Annotations: &mcp.ToolAnnotations{
				DestructiveHint: jsonschema.Ptr(false),
				IdempotentHint:  true,
				OpenWorldHint:   jsonschema.Ptr(true),
				ReadOnlyHint:    true,
			},
		}, listHandler,
	)
	commentThreadCmd.AddCommand(listCmd)

	listCmd.Flags().StringSliceVarP(&ids, "ids", "i", []string{}, idsUsage)
	listCmd.Flags().StringVarP(
		&allThreadsRelatedToChannelId, "allThreadsRelatedToChannelId", "a", "",
		atrtcidUsage,
	)
	listCmd.Flags().StringVarP(&channelId, "channelId", "c", "", cidUsage)
	listCmd.Flags().Int64VarP(&maxResults, "maxResults", "n", 5, pkg.MRUsage)
	listCmd.Flags().StringVarP(
		&moderationStatus, "moderationStatus", "m", "published", msUsage,
	)
	listCmd.Flags().StringVarP(&order, "order", "O", "time", orderUsage)
	listCmd.Flags().StringVarP(&searchTerms, "searchTerms", "s", "", stUsage)
	listCmd.Flags().StringVarP(&textFormat, "textFormat", "t", "html", tfUsage)
	listCmd.Flags().StringVarP(&videoId, "videoId", "v", "", listVidUsage)
	listCmd.Flags().StringSliceVarP(
		&parts, "parts", "p", []string{"id", "snippet"}, pkg.PartsUsage,
	)
	listCmd.Flags().StringVarP(&output, "output", "o", "table", pkg.TableUsage)
	listCmd.Flags().StringVarP(&jpath, "jsonpath", "j", "", pkg.JPUsage)
}

var listCmd = &cobra.Command{
	Use:   "list",
	Short: listShort,
	Long:  listLong,
	Run: func(cmd *cobra.Command, args []string) {
		err := list(cmd.OutOrStdout())
		if err != nil {
			_ = cmd.Help()
			cmd.PrintErrf("Error: %v\n", err)
		}
	},
}

func listHandler(
	ctx context.Context, req *mcp.CallToolRequest, input listIn,
) (*mcp.CallToolResult, any, error) {
	logger := slog.New(
		mcp.NewLoggingHandler(
			req.Session,
			&mcp.LoggingHandlerOptions{LoggerName: listTool, MinInterval: time.Second},
		),
	)

	ids = input.Ids
	allThreadsRelatedToChannelId = input.AllThreadsRelatedToChannelId
	channelId = input.ChannelId
	maxResults = input.MaxResults
	moderationStatus = input.ModerationStatus
	order = input.Order
	searchTerms = input.SearchTerms
	textFormat = input.TextFormat
	videoId = input.VideoId
	parts = input.Parts
	output = input.Output
	jpath = input.Jsonpath

	var writer bytes.Buffer
	err := list(&writer)
	if err != nil {
		logger.ErrorContext(ctx, err.Error(), "input", input)
		return nil, nil, err
	}
	return &mcp.CallToolResult{Content: []mcp.Content{&mcp.TextContent{Text: writer.String()}}}, nil, nil
}

func list(writer io.Writer) error {
	ct := commentThread.NewCommentThread(
		commentThread.WithIDs(ids),
		commentThread.WithAllThreadsRelatedToChannelId(allThreadsRelatedToChannelId),
		commentThread.WithChannelId(channelId),
		commentThread.WithMaxResults(maxResults),
		commentThread.WithModerationStatus(moderationStatus),
		commentThread.WithOrder(order),
		commentThread.WithSearchTerms(searchTerms),
		commentThread.WithTextFormat(textFormat),
		commentThread.WithVideoId(videoId),
		commentThread.WithService(nil),
	)

	return ct.List(parts, output, jpath, writer)
}