package issue

import (
	"context"
	"errors"
	"fmt"

	"git.lethalbits.com/lethalbits/gitea-mcp-extended/pkg/gitea"
	"git.lethalbits.com/lethalbits/gitea-mcp-extended/pkg/log"
	"git.lethalbits.com/lethalbits/gitea-mcp-extended/pkg/params"
	"git.lethalbits.com/lethalbits/gitea-mcp-extended/pkg/to"

	gitea_sdk "code.gitea.io/sdk/gitea"
	"github.com/mark3labs/mcp-go/mcp"
	"github.com/mark3labs/mcp-go/server"
)

const (
	ListIssueSubscribersToolName  = "list_issue_subscribers"
	CheckIssueSubscriptionToolName = "check_issue_subscription"
	IssueSubscribeToolName         = "issue_subscribe"
	IssueUnSubscribeToolName       = "issue_unsubscribe"
)

var (
	ListIssueSubscribersTool = mcp.NewTool(
		ListIssueSubscribersToolName,
		mcp.WithDescription("List users subscribed to an issue"),
		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
		mcp.WithNumber("index", mcp.Required(), mcp.Description("issue index")),
	)

	CheckIssueSubscriptionTool = mcp.NewTool(
		CheckIssueSubscriptionToolName,
		mcp.WithDescription("Check if the authenticated user is subscribed to an issue"),
		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
		mcp.WithNumber("index", mcp.Required(), mcp.Description("issue index")),
	)

	IssueSubscribeTool = mcp.NewTool(
		IssueSubscribeToolName,
		mcp.WithDescription("Subscribe to an issue"),
		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
		mcp.WithNumber("index", mcp.Required(), mcp.Description("issue index")),
	)

	IssueUnSubscribeTool = mcp.NewTool(
		IssueUnSubscribeToolName,
		mcp.WithDescription("Unsubscribe from an issue"),
		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
		mcp.WithNumber("index", mcp.Required(), mcp.Description("issue index")),
	)
)

func init() {
	Tool.RegisterRead(server.ServerTool{Tool: ListIssueSubscribersTool, Handler: ListIssueSubscribersFn})
	Tool.RegisterRead(server.ServerTool{Tool: CheckIssueSubscriptionTool, Handler: CheckIssueSubscriptionFn})
	Tool.RegisterWrite(server.ServerTool{Tool: IssueSubscribeTool, Handler: IssueSubscribeFn})
	Tool.RegisterWrite(server.ServerTool{Tool: IssueUnSubscribeTool, Handler: IssueUnSubscribeFn})
}

func ListIssueSubscribersFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called ListIssueSubscribersFn")
	owner, _ := req.GetArguments()["owner"].(string)
	repo, _ := req.GetArguments()["repo"].(string)
	if owner == "" || repo == "" {
		return to.ErrorResult(errors.New("owner and repo are required"))
	}
	index, err := params.GetIndex(req.GetArguments(), "index")
	if err != nil {
		return to.ErrorResult(err)
	}
	client, err := gitea.ClientFromContext(ctx)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
	}
	users, _, err := client.ListIssueSubscribers(owner, repo, index, gitea_sdk.ListIssueSubscribersOptions{})
	if err != nil {
		return to.ErrorResult(fmt.Errorf("list issue subscribers err: %v", err))
	}
	return to.TextResult(users)
}

func CheckIssueSubscriptionFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called CheckIssueSubscriptionFn")
	owner, _ := req.GetArguments()["owner"].(string)
	repo, _ := req.GetArguments()["repo"].(string)
	if owner == "" || repo == "" {
		return to.ErrorResult(errors.New("owner and repo are required"))
	}
	index, err := params.GetIndex(req.GetArguments(), "index")
	if err != nil {
		return to.ErrorResult(err)
	}
	client, err := gitea.ClientFromContext(ctx)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
	}
	info, _, err := client.CheckIssueSubscription(owner, repo, index)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("check issue subscription err: %v", err))
	}
	return to.TextResult(info)
}

func IssueSubscribeFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called IssueSubscribeFn")
	owner, _ := req.GetArguments()["owner"].(string)
	repo, _ := req.GetArguments()["repo"].(string)
	if owner == "" || repo == "" {
		return to.ErrorResult(errors.New("owner and repo are required"))
	}
	index, err := params.GetIndex(req.GetArguments(), "index")
	if err != nil {
		return to.ErrorResult(err)
	}
	client, err := gitea.ClientFromContext(ctx)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
	}
	_, err = client.IssueSubscribe(owner, repo, index)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("issue subscribe err: %v", err))
	}
	return to.TextResult(map[string]string{"status": "subscribed"})
}

func IssueUnSubscribeFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called IssueUnSubscribeFn")
	owner, _ := req.GetArguments()["owner"].(string)
	repo, _ := req.GetArguments()["repo"].(string)
	if owner == "" || repo == "" {
		return to.ErrorResult(errors.New("owner and repo are required"))
	}
	index, err := params.GetIndex(req.GetArguments(), "index")
	if err != nil {
		return to.ErrorResult(err)
	}
	client, err := gitea.ClientFromContext(ctx)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
	}
	_, err = client.IssueUnSubscribe(owner, repo, index)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("issue unsubscribe err: %v", err))
	}
	return to.TextResult(map[string]string{"status": "unsubscribed"})
}