using ClawdDotNet.Core.Audit;
using ClawdDotNet.Core.Automation;
using ClawdDotNet.Core.Storage;
using ClawdDotNet.Core.Tasks;
using Microsoft.Extensions.Logging.Abstractions;
using Shouldly;

namespace ClawdDotNet.Core.Tests.Automation;

/// <summary>
/// #726: Agents propose workflows, measured and checked for free; the human decides and imports
/// by hand. No flood, and a rejected proposal does not come back without a new argument.
/// </summary>
public sealed class AutomationProposalsTests : IDisposable
{
    private readonly string _directory = Path.Combine(Path.GetTempPath(), "clawd-tests", "auto-" + Guid.NewGuid().ToString("N")[..8]);
    private readonly SqliteAuditRepository _audit;
    private readonly SqliteTaskRepository _tasks;
    private readonly TaskboardService _board;
    private readonly AutomationProposals _proposals;

    private const string Workflow = """
        {"nodes":[
          {"name":"Every morning","type":"n8n-nodes-base.scheduleTrigger","parameters":{}},
          {"name":"Get rates","type":"n8n-nodes-base.httpRequest","parameters":{"url":"https://api.rates.example/eur","headers":{"x":"={{ $env.TOKEN }}"}}},
          {"name":"Mail","type":"n8n-nodes-base.emailSend","parameters":{"toEmail":"desk@example.org"},"credentials":{"smtp":{"id":"1","name":"Office SMTP"}}}
        ],"connections":{}}
        """;

    public AutomationProposalsTests()
    {
        var storage = new SqliteStorage(Path.Combine(_directory, "state.db"));
        _audit = new SqliteAuditRepository(storage);
        _tasks = new SqliteTaskRepository(storage);
        _board = new TaskboardService(_tasks, Path.Combine(_directory, "tasks"));
        _proposals = new AutomationProposals(storage, _audit, _tasks, _board, NullLogger.Instance);
    }

    public void Dispose()
    {
        SqliteStorage.ReleasePooledConnections(_directory);
        try { Directory.Delete(_directory, recursive: true); }
        catch { /* cleanup is secondary */ }
    }

    // ─── the review ───

    [Fact]
    public void The_review_says_what_the_workflow_does_and_where_it_reaches()
    {
        var review = WorkflowReview.Review(Workflow, null);

        review.Ok.ShouldBeTrue(string.Join(" ", review.Problems));
        review.Nodes.Select(n => n.Effect).ShouldBe(["starts the workflow", "calls an address", "sends mail"]);
        review.Targets.ShouldBe(["api.rates.example", "desk@example.org"]);
        review.Summary.ShouldContain("Reaches outside: api.rates.example");
    }

    [Fact]
    public void Code_needs_a_reason_and_a_secret_is_never_carried()
    {
        const string code = """{"nodes":[{"name":"Calc","type":"n8n-nodes-base.code","parameters":{"jsCode":"return 1"}}]}""";

        WorkflowReview.Review(code, null).Problems.ShouldContain(p => p.Contains("Without a reason"));
        var reasoned = WorkflowReview.Review(code, "Rounds prices the same way the shop does.");
        reasoned.Ok.ShouldBeTrue();
        reasoned.Warnings.ShouldContain(w => w.Contains("Rounds prices"));

        WorkflowReview.Review("""{"nodes":[{"name":"Api","type":"n8n-nodes-base.httpRequest","parameters":{"url":"https://x.example","apiKey":"k-123"}}]}""", null)
            .Problems.ShouldContain(p => p.Contains("parameters") || p.Contains("apiKey"));
        WorkflowReview.Review("""{"nodes":[{"name":"Api","type":"n8n-nodes-base.httpRequest","parameters":{"headerValue":"Bearer abc"}}]}""", null)
            .Ok.ShouldBeFalse("a bearer token by its look");
        WorkflowReview.Review("not json", null).Ok.ShouldBeFalse();
        WorkflowReview.Review("""{"nodes":[]}""", null).Ok.ShouldBeFalse();
    }

    // ─── proposing ───

    private async Task<string> RecurringTask(int runs, string agent = "desk", bool same = true)
    {
        var task = await _board.CreateAsync(new TaskItem
        {
            Title = "Morning exchange rates",
            Assignee = "@" + agent,
            When = new TaskWhen { Kind = TaskWhenKind.Cron, Value = "0 7 * * *", TimeZone = "Europe/Berlin" }
        }, default);
        for (var i = 0; i < runs; i++)
        {
            var run = $"run-{task.Id}-{i}";
            await _audit.AppendAsync(new AuditEntry { RunId = run, AgentId = agent, Tool = "WebFetch", Arguments = "{\"action\":\"fetch\"}", Status = AuditStatus.Ok, OccurredAt = DateTime.UtcNow.AddDays(-i) }, default);
            await _audit.AppendAsync(new AuditEntry { RunId = run, AgentId = agent, Tool = same || i % 2 == 0 ? "Mail" : "FileRW", Arguments = "{\"action\":\"send\"}", Status = AuditStatus.Ok, OccurredAt = DateTime.UtcNow.AddDays(-i) }, default);
            await _audit.RecordReceiptAsync(new RunReceipt { RunId = run, AgentId = agent, TaskId = task.Id, Status = "Completed", CostUsd = 0.05m, CostIsKnown = true, PromptTokens = 1000, OccurredAt = DateTime.UtcNow.AddDays(-i) }, default);
        }
        return task.Id;
    }

    private AutomationRequest Request(string taskId, string purpose = "Send the morning exchange rates", long? answers = null, string? argument = null)
        => new("desk", purpose, "every morning at 7", [taskId], ["Office SMTP"], "Sends rates to the desk only.", "Run once by hand, check the mail.", Workflow, null, answers, argument);

    [Fact]
    public async Task A_proposal_carries_its_measured_saving_and_goes_to_a_human()
    {
        var taskId = await RecurringTask(10);

        var outcome = await _proposals.ProposeAsync(Request(taskId), default);

        outcome.Ok.ShouldBeTrue(outcome.Message);
        var proposal = (await _proposals.ListAsync("proposed", 10, default)).Single();
        proposal.Savings.Runs.ShouldBe(10);
        proposal.Savings.CostUsd.ShouldBe(0.50m);
        proposal.Summary.ShouldContain("api.rates.example");
        (await _board.ListAsync(new TaskQuery { Assignee = TaskAssignee.Human }, default)).ShouldContain(t => t.Title.Contains($"#{proposal.Id}"));
    }

    [Fact]
    public async Task The_same_purpose_is_not_proposed_twice_and_a_rejection_must_be_answered()
    {
        var taskId = await RecurringTask(3);
        var first = await _proposals.ProposeAsync(Request(taskId), default);

        (await _proposals.ProposeAsync(Request(taskId, "Send the exchange rates every morning"), default)).Message.ShouldContain($"#{first.Id}");

        (await _proposals.DecideAsync(first.Id!.Value, false, "", default)).Ok.ShouldBeFalse("a rejection needs its reason");
        (await _proposals.DecideAsync(first.Id!.Value, false, "Rates change format often — the agent copes, a workflow breaks.", default)).Ok.ShouldBeTrue();

        (await _proposals.ProposeAsync(Request(taskId), default)).Message.ShouldContain("must answer");
        (await _proposals.ProposeAsync(Request(taskId, answers: first.Id, argument: "The rates API now has a versioned, stable format."), default))
            .Ok.ShouldBeTrue();
        (await _proposals.FindAsync("exchange rates", default)).Count.ShouldBe(2);
    }

    [Fact]
    public async Task An_agent_has_at_most_three_open_proposals()
    {
        for (var i = 0; i < 3; i++)
            (await _proposals.ProposeAsync(Request(await RecurringTask(1), $"Purpose number {i} quite different {Guid.NewGuid():N}"), default)).Ok.ShouldBeTrue();

        (await _proposals.ProposeAsync(Request(await RecurringTask(1), "A fourth unrelated thing entirely"), default)).Message.ShouldContain("Wait for a decision");
    }

    [Fact]
    public async Task A_proposal_without_the_required_parts_or_a_broken_workflow_is_refused()
    {
        var taskId = await RecurringTask(1);

        (await _proposals.ProposeAsync(Request(taskId) with { TaskIds = [] }, default)).Message.ShouldContain("'tasks'");
        (await _proposals.ProposeAsync(Request("t-nope"), default)).Message.ShouldContain("no task");
        (await _proposals.ProposeAsync(Request(taskId) with { WorkflowJson = """{"nodes":[{"name":"x","type":"n8n-nodes-base.executeCommand"}]}""" }, default))
            .Message.ShouldContain("does not pass the check");
    }

    // ─── candidates ───

    [Fact]
    public async Task A_recurring_task_that_does_the_same_each_time_is_put_to_its_agent_once()
    {
        var same = await RecurringTask(9, "desk");
        var varied = await RecurringTask(9, "other", same: false);

        var noted = await _proposals.FindCandidatesAsync(default);

        noted.ShouldBe([same], "half the runs of the other task differ");
        (await _board.ListAsync(new TaskQuery { Assignee = "@desk" }, default)).ShouldContain(t => t.Title.StartsWith("Automation candidate"));
        (await _proposals.FindCandidatesAsync(default)).ShouldBeEmpty("once a month, not every day");
        varied.ShouldNotBe(same);
    }

    [Fact]
    public void The_signature_folds_repeats_and_leaves_out_bookkeeping()
    {
        AuditEntry E(string tool, string op) => new() { Tool = tool, Arguments = $"{{\"action\":\"{op}\"}}", Status = AuditStatus.Ok };

        AutomationProposals.Signature([E("FileRW", "read"), E("FileRW", "read"), E("Taskboard", "complete"), E("Mail", "send")])
            .ShouldBe("FileRW.read > Mail.send");
    }
}