// <copyright file="CodeScanningAlert.cs" company="StellaOps">
// Copyright (c) StellaOps. Licensed under the AGPL-3.0-or-later.
// </copyright>

using System.Text.Json.Serialization;

namespace StellaOps.Integrations.Plugin.GitHubApp.CodeScanning;

/// <summary>
/// Code scanning alert from GitHub.
/// Sprint: SPRINT_20260109_010_002 Task: Implement models
/// </summary>
public sealed record CodeScanningAlert
{
    /// <summary>
    /// Alert number.
    /// </summary>
    [JsonPropertyName("number")]
    public required int Number { get; init; }

    /// <summary>
    /// Alert state (open, closed, dismissed, fixed).
    /// </summary>
    [JsonPropertyName("state")]
    public required string State { get; init; }

    /// <summary>
    /// Rule ID that triggered the alert.
    /// </summary>
    public required string RuleId { get; init; }

    /// <summary>
    /// Rule severity.
    /// </summary>
    public required string RuleSeverity { get; init; }

    /// <summary>
    /// Rule description.
    /// </summary>
    public required string RuleDescription { get; init; }

    /// <summary>
    /// Tool that produced the alert.
    /// </summary>
    public required string Tool { get; init; }

    /// <summary>
    /// HTML URL to the alert.
    /// </summary>
    [JsonPropertyName("html_url")]
    public required string HtmlUrl { get; init; }

    /// <summary>
    /// When the alert was created.
    /// </summary>
    [JsonPropertyName("created_at")]
    public required DateTimeOffset CreatedAt { get; init; }

    /// <summary>
    /// When the alert was dismissed (if applicable).
    /// </summary>
    [JsonPropertyName("dismissed_at")]
    public DateTimeOffset? DismissedAt { get; init; }

    /// <summary>
    /// Reason for dismissal.
    /// </summary>
    [JsonPropertyName("dismissed_reason")]
    public string? DismissedReason { get; init; }

    /// <summary>
    /// Who dismissed the alert.
    /// </summary>
    [JsonPropertyName("dismissed_by")]
    public string? DismissedBy { get; init; }

    /// <summary>
    /// Most recent instance of the alert.
    /// </summary>
    [JsonPropertyName("most_recent_instance")]
    public AlertInstance? MostRecentInstance { get; init; }

    /// <summary>
    /// Creates alert from GitHub API response.
    /// </summary>
    public static CodeScanningAlert FromApiResponse(GitHubAlertResponse response) => new()
    {
        Number = response.Number,
        State = response.State ?? "unknown",
        RuleId = response.Rule?.Id ?? "unknown",
        RuleSeverity = response.Rule?.Severity ?? "unknown",
        RuleDescription = response.Rule?.Description ?? "",
        Tool = response.Tool?.Name ?? "unknown",
        HtmlUrl = response.HtmlUrl ?? "",
        CreatedAt = response.CreatedAt,
        DismissedAt = response.DismissedAt,
        DismissedReason = response.DismissedReason,
        DismissedBy = response.DismissedBy?.Login,
        MostRecentInstance = response.MostRecentInstance is not null
            ? AlertInstance.FromApiResponse(response.MostRecentInstance)
            : null
    };
}

/// <summary>
/// Alert instance location.
/// </summary>
public sealed record AlertInstance
{
    /// <summary>
    /// Git ref where the alert was found.
    /// </summary>
    public required string Ref { get; init; }

    /// <summary>
    /// Analysis key.
    /// </summary>
    public string? AnalysisKey { get; init; }

    /// <summary>
    /// Environment (e.g., "production").
    /// </summary>
    public string? Environment { get; init; }

    /// <summary>
    /// Location in the code.
    /// </summary>
    public AlertLocation? Location { get; init; }

    /// <summary>
    /// Creates instance from API response.
    /// </summary>
    public static AlertInstance FromApiResponse(GitHubAlertInstanceResponse response) => new()
    {
        Ref = response.Ref ?? "unknown",
        AnalysisKey = response.AnalysisKey,
        Environment = response.Environment,
        Location = response.Location is not null
            ? new AlertLocation
            {
                Path = response.Location.Path ?? "",
                StartLine = response.Location.StartLine,
                EndLine = response.Location.EndLine,
                StartColumn = response.Location.StartColumn,
                EndColumn = response.Location.EndColumn
            }
            : null
    };
}

/// <summary>
/// Alert location in source code.
/// </summary>
public sealed record AlertLocation
{
    /// <summary>
    /// File path.
    /// </summary>
    public required string Path { get; init; }

    /// <summary>
    /// Start line.
    /// </summary>
    public int? StartLine { get; init; }

    /// <summary>
    /// End line.
    /// </summary>
    public int? EndLine { get; init; }

    /// <summary>
    /// Start column.
    /// </summary>
    public int? StartColumn { get; init; }

    /// <summary>
    /// End column.
    /// </summary>
    public int? EndColumn { get; init; }
}

#region GitHub API Response Models

/// <summary>
/// GitHub API alert response.
/// </summary>
public sealed record GitHubAlertResponse
{
    [JsonPropertyName("number")]
    public int Number { get; init; }

    [JsonPropertyName("state")]
    public string? State { get; init; }

    [JsonPropertyName("rule")]
    public GitHubRuleResponse? Rule { get; init; }

    [JsonPropertyName("tool")]
    public GitHubToolResponse? Tool { get; init; }

    [JsonPropertyName("html_url")]
    public string? HtmlUrl { get; init; }

    [JsonPropertyName("created_at")]
    public DateTimeOffset CreatedAt { get; init; }

    [JsonPropertyName("dismissed_at")]
    public DateTimeOffset? DismissedAt { get; init; }

    [JsonPropertyName("dismissed_reason")]
    public string? DismissedReason { get; init; }

    [JsonPropertyName("dismissed_by")]
    public GitHubUserResponse? DismissedBy { get; init; }

    [JsonPropertyName("most_recent_instance")]
    public GitHubAlertInstanceResponse? MostRecentInstance { get; init; }
}

public sealed record GitHubRuleResponse
{
    [JsonPropertyName("id")]
    public string? Id { get; init; }

    [JsonPropertyName("severity")]
    public string? Severity { get; init; }

    [JsonPropertyName("description")]
    public string? Description { get; init; }
}

public sealed record GitHubToolResponse
{
    [JsonPropertyName("name")]
    public string? Name { get; init; }

    [JsonPropertyName("version")]
    public string? Version { get; init; }
}

public sealed record GitHubUserResponse
{
    [JsonPropertyName("login")]
    public string? Login { get; init; }
}

public sealed record GitHubAlertInstanceResponse
{
    [JsonPropertyName("ref")]
    public string? Ref { get; init; }

    [JsonPropertyName("analysis_key")]
    public string? AnalysisKey { get; init; }

    [JsonPropertyName("environment")]
    public string? Environment { get; init; }

    [JsonPropertyName("location")]
    public GitHubLocationResponse? Location { get; init; }
}

public sealed record GitHubLocationResponse
{
    [JsonPropertyName("path")]
    public string? Path { get; init; }

    [JsonPropertyName("start_line")]
    public int? StartLine { get; init; }

    [JsonPropertyName("end_line")]
    public int? EndLine { get; init; }

    [JsonPropertyName("start_column")]
    public int? StartColumn { get; init; }

    [JsonPropertyName("end_column")]
    public int? EndColumn { get; init; }
}

#endregion