using System.Text.Json;
using AxCopilot.Services.Agent;
using FluentAssertions;
using Xunit;

namespace AxCopilot.Tests.Services;

public class DeckQualityReviewServiceTests
{
    [Fact]
    public void ReviewDeck_ShouldFlagMissingExecutiveSummaryAndRecommendation()
    {
        using var slides = JsonDocument.Parse(
            """
            [
              {
                "layout": "content",
                "title": "Current State",
                "body": "Point 1\nPoint 2\nPoint 3\nPoint 4\nPoint 5\nPoint 6\nPoint 7"
              },
              {
                "layout": "content",
                "title": "Findings",
                "body": "Observation A\nObservation B\nObservation C"
              }
            ]
            """);

        var review = DeckQualityReviewService.ReviewDeck("Weak Deck", slides.RootElement, hasTemplate: false, autoRepairCount: 0);

        review.Score.Should().BeLessThan(75);
        review.Issues.Should().Contain(issue => issue.Message.Contains("Executive Summary"));
        review.Issues.Should().Contain(issue => issue.Message.Contains("Recommendation"));
    }

    [Fact]
    public void ReviewDeck_ShouldRewardBalancedConsultingDeck()
    {
        using var slides = JsonDocument.Parse(
            """
            [
              { "layout": "title", "title": "Growth Strategy" },
              { "layout": "executive_summary", "title": "Executive Summary", "headline": "Headline", "summary_points": ["A","B","C"], "recommendation": "Do B" },
              { "layout": "comparison", "title": "Options", "headline": "Compare", "options": [{ "name": "A", "pros": "Fast", "cons": "Shallow", "verdict": "Fastest" }, { "name": "B", "pros": "Balanced", "cons": "Needs alignment", "verdict": "Recommended" }] },
              { "layout": "roadmap", "title": "Roadmap", "headline": "Execute in three phases", "phases": [{ "title": "Design", "detail": "Lock scope" }, { "title": "Launch", "detail": "Go live" }] },
              { "layout": "recommendation", "title": "Recommendation", "recommendation": "Approve phase-1", "summary_points": ["Reason 1", "Reason 2"] },
              { "layout": "table", "title": "Appendix & Evidence", "headers": ["Evidence","Detail"], "rows": [["Metric","Value"]] }
            ]
            """);

        var review = DeckQualityReviewService.ReviewDeck("Strong Deck", slides.RootElement, hasTemplate: true, autoRepairCount: 2, storyline: ["Executive Summary", "Options", "Roadmap"]);

        review.Score.Should().BeGreaterThan(80);
        review.Strengths.Should().Contain(strength => strength.Contains("Executive Summary"));
        review.Issues.Should().NotContain(issue => issue.Severity == DeckReviewSeverity.Critical);
    }

    [Fact]
    public void ReviewDeck_ShouldSurfaceSlideLevelQualityAlerts()
    {
        using var slides = JsonDocument.Parse(
            """
            [
              { "layout": "title", "title": "Growth Strategy" },
              {
                "layout": "executive_summary",
                "title": "Executive Summary",
                "headline": "This headline is intentionally very long so that it exceeds the preferred consulting slide headline length and triggers the slide quality gate.",
                "summary_points": ["Only one point"]
              },
              {
                "layout": "comparison",
                "title": "Options",
                "headline": "Compare options",
                "options": [{ "name": "A", "pros": "Fast", "cons": "Shallow", "verdict": "Only option" }]
              }
            ]
            """);

        var review = DeckQualityReviewService.ReviewDeck("Alert Deck", slides.RootElement, hasTemplate: false, autoRepairCount: 0);

        review.Issues.Should().Contain(issue => issue.Message.Contains("Slide 2"));
        review.Issues.Should().Contain(issue => issue.Message.Contains("headline is too long"));
        review.Issues.Should().Contain(issue => issue.Message.Contains("decision ask", StringComparison.OrdinalIgnoreCase));
        review.Issues.Should().Contain(issue => issue.Message.Contains("comparison slide needs at least two options"));
    }

    [Fact]
    public void ReviewDeck_ShouldFlagMissingStorylineSlides_WhenHintsAreProvided()
    {
        using var slides = JsonDocument.Parse(
            """
            [
              { "layout": "title", "title": "PMO Steering" },
              { "layout": "executive_summary", "title": "Executive Summary", "headline": "Message", "summary_points": ["A", "B"], "recommendation": "Proceed" },
              { "layout": "recommendation", "title": "Recommendation", "recommendation": "Proceed", "summary_points": ["Reason"] }
            ]
            """);

        var review = DeckQualityReviewService.ReviewDeck(
            "Storyline Deck",
            slides.RootElement,
            hasTemplate: false,
            autoRepairCount: 0,
            storyline: ["Executive Summary", "Options", "Roadmap", "Appendix"]);

        review.Issues.Should().Contain(issue => issue.Message.Contains("Storyline expects an options or comparison slide", StringComparison.OrdinalIgnoreCase));
        review.Issues.Should().Contain(issue => issue.Message.Contains("Storyline expects a roadmap slide", StringComparison.OrdinalIgnoreCase));
        review.Issues.Should().Contain(issue => issue.Message.Contains("Storyline expects appendix or evidence support", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void ReviewDeck_ShouldFlagRecommendationSlideWithoutRationaleOrNextSteps()
    {
        using var slides = JsonDocument.Parse(
            """
            [
              { "layout": "title", "title": "PMO Steering" },
              { "layout": "executive_summary", "title": "Executive Summary", "headline": "Delivery is stable", "summary_points": ["A", "B"], "recommendation": "Proceed" },
              { "layout": "recommendation", "title": "Recommendation", "recommendation": "Proceed" }
            ]
            """);

        var review = DeckQualityReviewService.ReviewDeck("Thin Recommendation", slides.RootElement, hasTemplate: false, autoRepairCount: 0);

        review.Issues.Should().Contain(issue => issue.Message.Contains("supporting rationale or next steps", StringComparison.OrdinalIgnoreCase));
    }

    [Fact]
    public void ReviewDeck_ShouldFlagComparisonTradeoffsAndKpiContext()
    {
        using var slides = JsonDocument.Parse(
            """
            [
              { "layout": "title", "title": "Board Review" },
              {
                "layout": "executive_summary",
                "title": "Executive Summary",
                "summary_points": ["A", "B"],
                "recommendation": "Proceed"
              },
              {
                "layout": "comparison",
                "title": "Options",
                "headline": "Choose a path",
                "options": [
                  { "name": "A", "verdict": "Recommended" },
                  { "name": "B", "verdict": "Fallback" }
                ]
              },
              {
                "layout": "kpi_dashboard",
                "title": "KPIs",
                "headline": "Performance snapshot",
                "kpis": [
                  { "label": "Margin", "value": "+2.4pt" },
                  { "label": "Lead Time", "value": "-12%" },
                  { "label": "Quality", "value": "96%" }
                ]
              }
            ]
            """);

        var review = DeckQualityReviewService.ReviewDeck("Thin Signals", slides.RootElement, hasTemplate: false, autoRepairCount: 0);

        review.Issues.Should().Contain(issue => issue.Message.Contains("sharper single-message headline", StringComparison.OrdinalIgnoreCase));
        review.Issues.Should().Contain(issue => issue.Message.Contains("trade-offs behind the verdict", StringComparison.OrdinalIgnoreCase));
        review.Issues.Should().Contain(issue => issue.Message.Contains("trend or note context", StringComparison.OrdinalIgnoreCase));
    }
}