using System.Text.Json;
using ClawdDotNet.Core.Staging;
using ClawdDotNet.Core.Tools;
using ClawdDotNet.Tools.Database;
using ClawdDotNet.Tools.Tests.FileRW;
using Microsoft.Extensions.Logging.Abstractions;
using Shouldly;

namespace ClawdDotNet.Tools.Tests.Database;

/// <summary>
/// Pre-check (#579), approval key (#609) and permissions (#641) of the Database tool -
/// all checkable without a database connection, because it only looks at configuration and statement.
/// </summary>
public sealed class DatabasePreCheckTests
{
    private static readonly DatabaseTool Tool = new();

    private static AgentToolContext Context(string accessLevel, params string[] tables) => new(
        "agent", "inst",
        new Dictionary<string, object?>
        {
            ["type"] = "mysql",
            ["connectionString"] = "Server=nirgends",
            ["accessLevel"] = accessLevel,
            ["allowedTables"] = JsonSerializer.SerializeToElement(tables)
        },
        new NullStateStore(), NullLogger.Instance, CancellationToken.None);

    private static JsonElement Sql(string sql, string action = "query")
        => JsonSerializer.SerializeToElement(new { action, sql });

    [Fact]
    public void Foreign_table_is_rejected_up_front()
        => Tool.Preflight(Sql("SELECT * FROM protokoll"), Context("ReadOnly", "messwerte"))
            .ShouldNotBeNull().ShouldContain("protokoll");

    [Fact]
    public void Comments_are_rejected_up_front()
        => Tool.Preflight(Sql("DELETE FROM messwerte -- messwerte"), Context("Admin", "messwerte"))
            .ShouldNotBeNull();

    [Theory]
    [InlineData("SELECT * FROM messwerte", "ReadOnly")]
    [InlineData("INSERT INTO messwerte (ort) VALUES ('Berlin')", "ReadOnly")]
    [InlineData("ALTER TABLE messwerte ADD COLUMN x INT", "ReadWrite")]
    [InlineData("CREATE TABLE IF NOT EXISTS messwerte (id INT)", "Admin")]
    [InlineData("DESCRIBE messwerte", "ReadOnly")]
    public void The_pre_check_no_longer_judges_the_operation(string sql, string level)
    {
        // #641: Whether an INSERT of a reading agent runs, is presented or is forbidden
        // is decided by the approval point - no longer by a silent refusal in the tool.
        Tool.Preflight(Sql(sql), Context(level, "messwerte")).ShouldBeNull();
    }

    [Theory]
    [InlineData("SELECT * FROM messwerte", "query", "select")]
    [InlineData("DESCRIBE messwerte", "query", "select")]
    [InlineData("SHOW COLUMNS FROM messwerte", "query", "select")]
    [InlineData("INSERT INTO messwerte (ort) VALUES ('Berlin')", "query", "insert")]
    [InlineData("UPDATE messwerte SET ort = 'X'", "insert", "update")]
    [InlineData("DELETE FROM messwerte WHERE id = 1", "query", "delete")]
    [InlineData("CREATE TABLE messwerte (id INT)", "query", "create")]
    [InlineData("ALTER TABLE messwerte ADD COLUMN x INT", "query", "alter")]
    [InlineData("DROP TABLE IF EXISTS messwerte", "query", "drop")]
    [InlineData("insert into messwerte (ort) values ('select')", "query", "insert")]
    public void The_approval_key_is_the_SQL_operation_not_the_action_argument(string sql, string action, string expected)
        => Tool.StagingAction(Sql(sql, action)).ShouldBe(expected);

    [Theory]
    [InlineData("query", "select")]
    [InlineData("insert", "insert")]
    [InlineData("upsert", "update")]
    public void MongoDB_actions_are_mapped_to_the_same_operations(string action, string expected)
        => Tool.StagingAction(JsonSerializer.SerializeToElement(new { action, collection = "c" })).ShouldBe(expected);

    [Fact]
    public void The_operations_are_enumerated_for_the_UI()
        => Tool.Operationen.ShouldBe(["select", "insert", "update", "delete", "replace", "create", "alter", "drop", "truncate"]);

    [Theory]
    [InlineData("select", StagingDecision.Auto)]
    [InlineData("insert", StagingDecision.Approve)]
    [InlineData("alter", StagingDecision.Approve)]
    public void Without_allowed_the_agent_reads_freely_and_submits_everything_else(string operation, StagingDecision expected)
        => Tool.Vorgabe(operation, new Dictionary<string, object?>()).ShouldBe(expected);

    [Fact]
    public async Task Without_an_approver_the_access_tier_stays_a_hard_limit()
    {
        // No gate, no check: then the tool itself has to refuse before it
        // even establishes a connection.
        var result = await Tool.ExecuteAsync(
            Sql("INSERT INTO messwerte (ort) VALUES ('Berlin')"), Context("ReadOnly", "messwerte"), default);

        result.Success.ShouldBeFalse();
        result.ErrorMessage.ShouldNotBeNull().ShouldContain("ReadOnly");
    }
}