package user

import (
	"context"
	"errors"
	"fmt"

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

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

const (
	ListMyBlocksToolName  = "list_my_blocks"
	CheckUserBlockToolName = "check_user_block"
	BlockUserToolName      = "block_user"
	UnblockUserToolName    = "unblock_user"
)

var (
	ListMyBlocksTool = mcp.NewTool(
		ListMyBlocksToolName,
		mcp.WithDescription("List users blocked by the authenticated user"),
		mcp.WithNumber("page", mcp.Description("page number"), mcp.DefaultNumber(1)),
		mcp.WithNumber("pageSize", mcp.Description("page size"), mcp.DefaultNumber(100)),
	)

	CheckUserBlockTool = mcp.NewTool(
		CheckUserBlockToolName,
		mcp.WithDescription("Check if the authenticated user has blocked a user"),
		mcp.WithString("username", mcp.Required(), mcp.Description("username to check")),
	)

	BlockUserTool = mcp.NewTool(
		BlockUserToolName,
		mcp.WithDescription("Block a user"),
		mcp.WithString("username", mcp.Required(), mcp.Description("username to block")),
	)

	UnblockUserTool = mcp.NewTool(
		UnblockUserToolName,
		mcp.WithDescription("Unblock a user"),
		mcp.WithString("username", mcp.Required(), mcp.Description("username to unblock")),
	)
)

func init() {
	Tool.RegisterRead(server.ServerTool{Tool: ListMyBlocksTool, Handler: ListMyBlocksFn})
	Tool.RegisterRead(server.ServerTool{Tool: CheckUserBlockTool, Handler: CheckUserBlockFn})
	Tool.RegisterWrite(server.ServerTool{Tool: BlockUserTool, Handler: BlockUserFn})
	Tool.RegisterWrite(server.ServerTool{Tool: UnblockUserTool, Handler: UnblockUserFn})
}

func ListMyBlocksFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called ListMyBlocksFn")
	page := params.GetOptionalInt(req.GetArguments(), "page", 1)
	pageSize := params.GetOptionalInt(req.GetArguments(), "pageSize", 100)
	client, err := gitea.ClientFromContext(ctx)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
	}
	users, _, err := client.ListMyBlocks(gitea_sdk.ListUserBlocksOptions{
		ListOptions: gitea_sdk.ListOptions{Page: int(page), PageSize: int(pageSize)},
	})
	if err != nil {
		return to.ErrorResult(fmt.Errorf("list my blocks err: %v", err))
	}
	return to.TextResult(users)
}

func CheckUserBlockFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called CheckUserBlockFn")
	username, ok := req.GetArguments()["username"].(string)
	if !ok {
		return to.ErrorResult(errors.New("username is required"))
	}
	client, err := gitea.ClientFromContext(ctx)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
	}
	isBlocked, _, err := client.CheckUserBlock(username)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("check block %s err: %v", username, err))
	}
	return to.TextResult(map[string]any{"username": username, "is_blocked": isBlocked})
}

func BlockUserFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called BlockUserFn")
	username, ok := req.GetArguments()["username"].(string)
	if !ok {
		return to.ErrorResult(errors.New("username is required"))
	}
	client, err := gitea.ClientFromContext(ctx)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
	}
	_, err = client.BlockUser(username)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("block user %s err: %v", username, err))
	}
	return to.TextResult(map[string]string{"status": "blocked", "username": username})
}

func UnblockUserFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called UnblockUserFn")
	username, ok := req.GetArguments()["username"].(string)
	if !ok {
		return to.ErrorResult(errors.New("username is required"))
	}
	client, err := gitea.ClientFromContext(ctx)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("get gitea client err: %v", err))
	}
	_, err = client.UnblockUser(username)
	if err != nil {
		return to.ErrorResult(fmt.Errorf("unblock user %s err: %v", username, err))
	}
	return to.TextResult(map[string]string{"status": "unblocked", "username": username})
}