using System.ComponentModel;
using ClaudeDo.Data.Models;
using ClaudeDo.Data.Repositories;
using ClaudeDo.Worker.Hub;
using ModelContextProtocol.Server;

namespace ClaudeDo.Worker.External;

public sealed record TaskConfigDto(string? Model, string? SystemPrompt, string? AgentPath, int? MaxTurns);
public sealed record TaskConfigResult(bool Found, TaskConfigDto? Config);
public sealed record SetListConfigResult(bool Ok, string ListId, TaskConfigDto? Config);
public sealed record SetTaskConfigResult(bool Ok, string TaskId, TaskConfigDto? Config);

[McpServerToolType]
public sealed class ConfigMcpTools
{
    private readonly ListRepository _lists;
    private readonly TaskRepository _tasks;
    private readonly HubBroadcaster _broadcaster;

    public ConfigMcpTools(ListRepository lists, TaskRepository tasks, HubBroadcaster broadcaster)
    {
        _lists = lists;
        _tasks = tasks;
        _broadcaster = broadcaster;
    }

    [McpServerTool, Description("Get a list's default config (model, system prompt, agent path). Returns { found: false, config: null } if no config is set.")]
    public async Task<TaskConfigResult> GetListConfig(string listId, CancellationToken cancellationToken)
    {
        var cfg = await _lists.GetConfigAsync(listId, cancellationToken);
        return cfg is null
            ? new TaskConfigResult(false, null)
            : new TaskConfigResult(true, new TaskConfigDto(cfg.Model, cfg.SystemPrompt, cfg.AgentPath, cfg.MaxTurns));
    }

    [McpServerTool, Description(
        "Set a list's default model/system prompt/agent path/max turns. Passing all four as null clears the list " +
        "config. Returns { ok, listId, config } — config is null when the config was cleared, otherwise it echoes " +
        "the fields that were set (a field is null there if it was individually left unset/cleared).")]
    public async Task<SetListConfigResult> SetListConfig(
        string listId, string? model = null, string? systemPrompt = null, string? agentPath = null,
        int? maxTurns = null, CancellationToken cancellationToken = default)
    {
        _ = await _lists.GetByIdAsync(listId, cancellationToken)
            ?? throw new InvalidOperationException($"List {listId} not found.");

        var m = model.NullIfBlank();
        var sp = systemPrompt.NullIfBlank();
        var ap = agentPath.NullIfBlank();

        TaskConfigDto? config;
        if (m is null && sp is null && ap is null && maxTurns is null)
        {
            await _lists.DeleteConfigAsync(listId, cancellationToken);
            config = null;
        }
        else
        {
            await _lists.SetConfigAsync(new ListConfigEntity
            {
                ListId = listId, Model = m, SystemPrompt = sp, AgentPath = ap, MaxTurns = maxTurns,
            }, cancellationToken);
            config = new TaskConfigDto(m, sp, ap, maxTurns);
        }

        await _broadcaster.ListUpdated(listId);
        return new SetListConfigResult(true, listId, config);
    }

    [McpServerTool, Description(
        "Set per-task config overrides (model/system prompt/agent path/max turns). Pass null for any field to " +
        "clear that override. Returns { ok, taskId, config } — config echoes the resulting overrides (a field is " +
        "null there if it was cleared or never set).")]
    public async Task<SetTaskConfigResult> SetTaskConfig(
        string taskId, string? model = null, string? systemPrompt = null, string? agentPath = null,
        int? maxTurns = null, CancellationToken cancellationToken = default)
    {
        _ = await _tasks.GetByIdAsync(taskId, cancellationToken)
            ?? throw new InvalidOperationException($"Task {taskId} not found.");

        var m = model.NullIfBlank();
        var sp = systemPrompt.NullIfBlank();
        var ap = agentPath.NullIfBlank();

        await _tasks.UpdateAgentSettingsAsync(taskId, m, sp, ap, maxTurns, ct: cancellationToken);
        await _broadcaster.TaskUpdated(taskId);
        return new SetTaskConfigResult(true, taskId, new TaskConfigDto(m, sp, ap, maxTurns));
    }

    [McpServerTool, Description("Get per-task config overrides (model/system prompt/agent path/max turns). Returns { found: false, config: null } if no override is set on this task.")]
    public async Task<TaskConfigResult> GetTaskConfig(string taskId, CancellationToken cancellationToken)
    {
        var task = await _tasks.GetByIdAsync(taskId, cancellationToken)
            ?? throw new InvalidOperationException($"Task {taskId} not found.");
        if (task.Model is null && task.SystemPrompt is null && task.AgentPath is null && task.MaxTurns is null)
            return new TaskConfigResult(false, null);
        return new TaskConfigResult(true, new TaskConfigDto(task.Model, task.SystemPrompt, task.AgentPath, task.MaxTurns));
    }
}