package github

import (
	"context"
	"encoding/json"
	"fmt"
	"io"

	"github.com/github/github-mcp-server/pkg/translations"
	"github.com/google/go-github/v69/github"
	"github.com/mark3labs/mcp-go/mcp"
	"github.com/mark3labs/mcp-go/server"
)

// searchRepositories creates a tool to search for GitHub repositories.
func searchRepositories(client *github.Client, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("search_repositories",
			mcp.WithDescription(t("TOOL_SEARCH_REPOSITORIES_DESCRIPTION", "Search for GitHub repositories")),
			mcp.WithString("query",
				mcp.Required(),
				mcp.Description("Search query"),
			),
			mcp.WithNumber("page",
				mcp.Description("Page number for pagination"),
			),
			mcp.WithNumber("per_page",
				mcp.Description("Results per page (max 100)"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			query, err := requiredParam[string](request, "query")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			page, err := optionalIntParamWithDefault(request, "page", 1)
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			perPage, err := optionalIntParamWithDefault(request, "per_page", 30)
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			opts := &github.SearchOptions{
				ListOptions: github.ListOptions{
					Page:    page,
					PerPage: perPage,
				},
			}

			result, resp, err := client.Search.Repositories(ctx, query, opts)
			if err != nil {
				return nil, fmt.Errorf("failed to search repositories: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != 200 {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to search repositories: %s", string(body))), nil
			}

			r, err := json.Marshal(result)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// searchCode creates a tool to search for code across GitHub repositories.
func searchCode(client *github.Client, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("search_code",
			mcp.WithDescription(t("TOOL_SEARCH_CODE_DESCRIPTION", "Search for code across GitHub repositories")),
			mcp.WithString("q",
				mcp.Required(),
				mcp.Description("Search query using GitHub code search syntax"),
			),
			mcp.WithString("sort",
				mcp.Description("Sort field ('indexed' only)"),
			),
			mcp.WithString("order",
				mcp.Description("Sort order ('asc' or 'desc')"),
			),
			mcp.WithNumber("per_page",
				mcp.Description("Results per page (max 100)"),
			),
			mcp.WithNumber("page",
				mcp.Description("Page number"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			query, err := requiredParam[string](request, "q")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			sort, err := optionalParam[string](request, "sort")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			order, err := optionalParam[string](request, "order")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			perPage, err := optionalIntParamWithDefault(request, "per_page", 30)
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			page, err := optionalIntParamWithDefault(request, "page", 1)
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			opts := &github.SearchOptions{
				Sort:  sort,
				Order: order,
				ListOptions: github.ListOptions{
					PerPage: perPage,
					Page:    page,
				},
			}

			result, resp, err := client.Search.Code(ctx, query, opts)
			if err != nil {
				return nil, fmt.Errorf("failed to search code: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != 200 {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to search code: %s", string(body))), nil
			}

			r, err := json.Marshal(result)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}

// searchUsers creates a tool to search for GitHub users.
func searchUsers(client *github.Client, t translations.TranslationHelperFunc) (tool mcp.Tool, handler server.ToolHandlerFunc) {
	return mcp.NewTool("search_users",
			mcp.WithDescription(t("TOOL_SEARCH_USERS_DESCRIPTION", "Search for GitHub users")),
			mcp.WithString("q",
				mcp.Required(),
				mcp.Description("Search query using GitHub users search syntax"),
			),
			mcp.WithString("sort",
				mcp.Description("Sort field (followers, repositories, joined)"),
			),
			mcp.WithString("order",
				mcp.Description("Sort order ('asc' or 'desc')"),
			),
			mcp.WithNumber("per_page",
				mcp.Description("Results per page (max 100)"),
			),
			mcp.WithNumber("page",
				mcp.Description("Page number"),
			),
		),
		func(ctx context.Context, request mcp.CallToolRequest) (*mcp.CallToolResult, error) {
			query, err := requiredParam[string](request, "q")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			sort, err := optionalParam[string](request, "sort")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			order, err := optionalParam[string](request, "order")
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			perPage, err := optionalIntParamWithDefault(request, "per_page", 30)
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}
			page, err := optionalIntParamWithDefault(request, "page", 1)
			if err != nil {
				return mcp.NewToolResultError(err.Error()), nil
			}

			opts := &github.SearchOptions{
				Sort:  sort,
				Order: order,
				ListOptions: github.ListOptions{
					PerPage: perPage,
					Page:    page,
				},
			}

			result, resp, err := client.Search.Users(ctx, query, opts)
			if err != nil {
				return nil, fmt.Errorf("failed to search users: %w", err)
			}
			defer func() { _ = resp.Body.Close() }()

			if resp.StatusCode != 200 {
				body, err := io.ReadAll(resp.Body)
				if err != nil {
					return nil, fmt.Errorf("failed to read response body: %w", err)
				}
				return mcp.NewToolResultError(fmt.Sprintf("failed to search users: %s", string(body))), nil
			}

			r, err := json.Marshal(result)
			if err != nil {
				return nil, fmt.Errorf("failed to marshal response: %w", err)
			}

			return mcp.NewToolResultText(string(r)), nil
		}
}