using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Dapper;
using Gott.Models;

namespace Gott.Services;

public partial class DatabaseService
{
    // ── Agents ──

    public async Task<AgentRecord> CreateAgent(AgentRecord agent)
    {
        using var conn = CreateConnection();
        var now = DateTime.UtcNow.ToString("o");
        agent.AgentId = Guid.NewGuid().ToString("N");
        agent.CreatedAt = now;
        agent.UpdatedAt = now;
        await conn.ExecuteAsync(@"
            INSERT INTO agents (agent_id, user_id, name, avatar, avatar_small, description, model, tool_choice, custom_commands, auto_commit, use_soul, use_identity, use_user_info, use_memory, use_auto_context, use_github_search, use_web_search, web_search_version, allow_user_choice, task_instruction, avatar_scale, avatar_offset_x, avatar_offset_y, is_deleted, created_at, updated_at)
            VALUES (@AgentId, @UserId, @Name, @Avatar, @AvatarSmall, @Description, @Model, @ToolChoice, @CustomCommands, @AutoCommit, @UseSoul, @UseIdentity, @UseUserInfo, @UseMemory, @UseAutoContext, @UseGitHubSearch, @UseWebSearch, @WebSearchVersion, @AllowUserChoice, @TaskInstruction, @AvatarScale, @AvatarOffsetX, @AvatarOffsetY, 0, @CreatedAt, @UpdatedAt)
        ", agent);
        return agent;
    }

    public async Task<IEnumerable<AgentRecord>> GetAgents(string userId)
    {
        using var conn = CreateConnection();
        return await conn.QueryAsync<AgentRecord>(
            "SELECT * FROM agents WHERE user_id = @userId AND is_deleted = 0 ORDER BY name", new { userId });
    }

    public async Task<IEnumerable<AgentRecord>> GetAvailableAgents(string userId)
    {
        using var conn = CreateConnection();
        return await conn.QueryAsync<AgentRecord>(
            "SELECT * FROM agents WHERE (user_id = @userId OR is_public = 1) AND is_deleted = 0 ORDER BY name", new { userId });
    }

    public async Task<AgentRecord> GetAgent(string agentId)
    {
        using var conn = CreateConnection();
        return await conn.QuerySingleOrDefaultAsync<AgentRecord>(
            "SELECT * FROM agents WHERE agent_id = @agentId AND is_deleted = 0", new { agentId });
    }

    public async Task UpdateAgent(AgentRecord agent)
    {
        using var conn = CreateConnection();
        agent.UpdatedAt = DateTime.UtcNow.ToString("o");
        await conn.ExecuteAsync(@"
            UPDATE agents SET name = @Name, avatar = @Avatar, avatar_small = @AvatarSmall, description = @Description,
                model = @Model, tool_choice = @ToolChoice,
                custom_commands = @CustomCommands, auto_commit = @AutoCommit,
                use_soul = @UseSoul, use_identity = @UseIdentity, use_user_info = @UseUserInfo, use_memory = @UseMemory, use_auto_context = @UseAutoContext, use_github_search = @UseGitHubSearch, use_web_search = @UseWebSearch, web_search_version = @WebSearchVersion,
                allow_user_choice = @AllowUserChoice, task_instruction = @TaskInstruction,
                avatar_scale = @AvatarScale, avatar_offset_x = @AvatarOffsetX, avatar_offset_y = @AvatarOffsetY,
                is_public = @IsPublic, updated_at = @UpdatedAt
            WHERE agent_id = @AgentId AND user_id = @UserId
        ", agent);
    }

    public async Task DeleteAgent(string agentId, string userId)
    {
        using var conn = CreateConnection();
        await conn.ExecuteAsync(
            "UPDATE agents SET is_deleted = 1, updated_at = @now WHERE agent_id = @agentId AND user_id = @userId",
            new { agentId, userId, now = DateTime.UtcNow.ToString("o") });
    }


    // ── Agent Skills ──

    public async Task<IEnumerable<string>> GetAgentSkills(string agentId)
    {
        using var conn = CreateConnection();
        return await conn.QueryAsync<string>(
            "SELECT skill_slug FROM agent_skills WHERE agent_id = @agentId ORDER BY skill_slug",
            new { agentId });
    }

    public async Task SetAgentSkills(string agentId, IEnumerable<string> skillSlugs)
    {
        using var conn = CreateConnection();
        using var tx = conn.BeginTransaction();

        await conn.ExecuteAsync("DELETE FROM agent_skills WHERE agent_id = @agentId", new { agentId }, tx);

        var now = DateTime.UtcNow.ToString("o");
        foreach (var slug in skillSlugs)
        {
            await conn.ExecuteAsync(@"
                INSERT INTO agent_skills (agent_id, skill_slug, created_at)
                VALUES (@agentId, @slug, @now)",
                new { agentId, slug, now }, tx);
        }

        tx.Commit();
    }

    public async Task AddAgentSkill(string agentId, string skillSlug)
    {
        using var conn = CreateConnection();
        var now = DateTime.UtcNow.ToString("o");
        await conn.ExecuteAsync(@"
            INSERT OR IGNORE INTO agent_skills (agent_id, skill_slug, created_at)
            VALUES (@agentId, @skillSlug, @now)",
            new { agentId, skillSlug, now });
    }

    public async Task RemoveAgentSkill(string agentId, string skillSlug)
    {
        using var conn = CreateConnection();
        await conn.ExecuteAsync(
            "DELETE FROM agent_skills WHERE agent_id = @agentId AND skill_slug = @skillSlug",
            new { agentId, skillSlug });
    }

}