package repo

import (
	"context"
	"fmt"

	"gitea.com/gitea/gitea-mcp/pkg/gitea"
	"gitea.com/gitea/gitea-mcp/pkg/log"
	"gitea.com/gitea/gitea-mcp/pkg/to"

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

const (
	GetFileToolName    = "get_file"
	CreateFileToolName = "create_file"
	UpdateFileToolName = "update_file"
	DeleteFileToolName = "delete_file"
)

var (
	GetFileTool = mcp.NewTool(
		GetFileToolName,
		mcp.WithDescription("Get file"),
		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
		mcp.WithString("ref", mcp.Required(), mcp.Description("ref")),
		mcp.WithString("filePath", mcp.Required(), mcp.Description("file path")),
	)

	CreateFileTool = mcp.NewTool(
		CreateFileToolName,
		mcp.WithDescription("Create file"),
		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
		mcp.WithString("filePath", mcp.Required(), mcp.Description("file path")),
		mcp.WithString("content", mcp.Required(), mcp.Description("file content")),
		mcp.WithString("message", mcp.Required(), mcp.Description("commit message")),
		mcp.WithString("branch_name", mcp.Required(), mcp.Description("branch name")),
		mcp.WithString("new_branch_name", mcp.Description("new branch name")),
	)

	UpdateFileTool = mcp.NewTool(
		UpdateFileToolName,
		mcp.WithDescription("Update file"),
		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
		mcp.WithString("filePath", mcp.Required(), mcp.Description("file path")),
		mcp.WithString("content", mcp.Required(), mcp.Description("file content")),
		mcp.WithString("message", mcp.Required(), mcp.Description("commit message")),
		mcp.WithString("branch_name", mcp.Required(), mcp.Description("branch name")),
	)

	DeleteFileTool = mcp.NewTool(
		DeleteFileToolName,
		mcp.WithDescription("Delete file"),
		mcp.WithString("owner", mcp.Required(), mcp.Description("repository owner")),
		mcp.WithString("repo", mcp.Required(), mcp.Description("repository name")),
		mcp.WithString("filePath", mcp.Required(), mcp.Description("file path")),
		mcp.WithString("message", mcp.Required(), mcp.Description("commit message")),
		mcp.WithString("branch_name", mcp.Required(), mcp.Description("branch name")),
		mcp.WithString("sha", mcp.Description("sha")),
	)
)

func GetFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called GetFileFn")
	owner, ok := req.Params.Arguments["owner"].(string)
	if !ok {
		return nil, fmt.Errorf("owner is required")
	}
	repo, ok := req.Params.Arguments["repo"].(string)
	if !ok {
		return nil, fmt.Errorf("repo is required")
	}
	ref, _ := req.Params.Arguments["ref"].(string)
	filePath, ok := req.Params.Arguments["filePath"].(string)
	if !ok {
		return nil, fmt.Errorf("filePath is required")
	}
	file, _, err := gitea.Client().GetFile(owner, repo, ref, filePath)
	if err != nil {
		return nil, fmt.Errorf("get file err: %v", err)
	}
	return to.TextResult(file)
}

func CreateFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called CreateFileFn")
	owner, ok := req.Params.Arguments["owner"].(string)
	if !ok {
		return nil, fmt.Errorf("owner is required")
	}
	repo, ok := req.Params.Arguments["repo"].(string)
	if !ok {
		return nil, fmt.Errorf("repo is required")
	}
	filePath, ok := req.Params.Arguments["filePath"].(string)
	if !ok {
		return nil, fmt.Errorf("filePath is required")
	}
	content, _ := req.Params.Arguments["content"].(string)
	message, _ := req.Params.Arguments["message"].(string)
	branchName, _ := req.Params.Arguments["branch_name"].(string)
	opt := gitea_sdk.CreateFileOptions{
		Content: content,
		FileOptions: gitea_sdk.FileOptions{
			Message:    message,
			BranchName: branchName,
		},
	}

	_, _, err := gitea.Client().CreateFile(owner, repo, filePath, opt)
	if err != nil {
		return nil, fmt.Errorf("create file err: %v", err)
	}
	return to.TextResult("Create file success")
}

func UpdateFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called UpdateFileFn")
	owner, ok := req.Params.Arguments["owner"].(string)
	if !ok {
		return nil, fmt.Errorf("owner is required")
	}
	repo, ok := req.Params.Arguments["repo"].(string)
	if !ok {
		return nil, fmt.Errorf("repo is required")
	}
	filePath, ok := req.Params.Arguments["filePath"].(string)
	if !ok {
		return nil, fmt.Errorf("filePath is required")
	}
	content, _ := req.Params.Arguments["content"].(string)
	message, _ := req.Params.Arguments["message"].(string)
	branchName, _ := req.Params.Arguments["branch_name"].(string)
	opt := gitea_sdk.UpdateFileOptions{
		Content: content,
		FileOptions: gitea_sdk.FileOptions{
			Message:    message,
			BranchName: branchName,
		},
	}
	_, _, err := gitea.Client().UpdateFile(owner, repo, filePath, opt)
	if err != nil {
		return nil, fmt.Errorf("update file err: %v", err)
	}
	return to.TextResult("Update file success")
}

func DeleteFileFn(ctx context.Context, req mcp.CallToolRequest) (*mcp.CallToolResult, error) {
	log.Debugf("Called DeleteFileFn")
	owner, ok := req.Params.Arguments["owner"].(string)
	if !ok {
		return nil, fmt.Errorf("owner is required")
	}
	repo, ok := req.Params.Arguments["repo"].(string)
	if !ok {
		return nil, fmt.Errorf("repo is required")
	}
	filePath, ok := req.Params.Arguments["filePath"].(string)
	if !ok {
		return nil, fmt.Errorf("filePath is required")
	}
	message, _ := req.Params.Arguments["message"].(string)
	branchName, _ := req.Params.Arguments["branch_name"].(string)
	opt := gitea_sdk.DeleteFileOptions{
		FileOptions: gitea_sdk.FileOptions{
			Message:    message,
			BranchName: branchName,
		},
	}
	_, err := gitea.Client().DeleteFile(owner, repo, filePath, opt)
	if err != nil {
		return nil, fmt.Errorf("delete file err: %v", err)
	}
	return to.TextResult("Delete file success")
}