namespace NeonSprawl.Server.Game.Contracts;

/// <summary>Resolves contract catalog paths for local dev, tests, and container layouts (NEO-145).</summary>
public static class ContractCatalogPathResolution
{
    /// <summary>Walks <paramref name="startDirectory"/> and parents for an existing <c>content/contracts</c> directory.</summary>
    public static string? TryDiscoverContractsDirectory(string startDirectory)
    {
        for (var dir = new DirectoryInfo(startDirectory); dir is not null; dir = dir.Parent)
        {
            var candidate = Path.Combine(dir.FullName, "content", "contracts");
            if (Directory.Exists(candidate))
                return Path.GetFullPath(candidate);
        }

        return null;
    }

    /// <summary>
    /// Resolves the contracts catalog directory.
    /// Empty <paramref name="configuredContractsDirectory"/> triggers discovery from <see cref="AppContext.BaseDirectory"/>.
    /// </summary>
    public static string ResolveContractsDirectory(string? configuredContractsDirectory, string contentRootPath)
    {
        if (string.IsNullOrWhiteSpace(configuredContractsDirectory))
        {
            var discovered = TryDiscoverContractsDirectory(AppContext.BaseDirectory);
            if (discovered is not null)
                return discovered;

            throw new InvalidOperationException(
                "Content:ContractsDirectory is not set and auto-discovery failed (no ancestor of AppContext.BaseDirectory contains 'content/contracts'). " +
                "Set Content:ContractsDirectory in configuration or environment (e.g. Content__ContractsDirectory).");
        }

        var trimmed = configuredContractsDirectory.Trim();
        if (Path.IsPathRooted(trimmed))
            return Path.GetFullPath(trimmed);

        return Path.GetFullPath(Path.Combine(contentRootPath, trimmed));
    }

    /// <summary>Resolves JSON Schema path for a single contract template row (Draft 2020-12).</summary>
    public static string ResolveContractTemplateSchemaPath(
        string contractsDirectory,
        string? configuredSchemaPath,
        string contentRootPath)
    {
        if (!string.IsNullOrWhiteSpace(configuredSchemaPath))
        {
            var trimmed = configuredSchemaPath.Trim();
            if (Path.IsPathRooted(trimmed))
                return Path.GetFullPath(trimmed);

            return Path.GetFullPath(Path.Combine(contentRootPath, trimmed));
        }

        return Path.GetFullPath(Path.Combine(contractsDirectory, "..", "schemas", "contract-template.schema.json"));
    }

    /// <summary>Resolves JSON Schema path for a reward grant row (shared by quest bundles and contract templates).</summary>
    public static string ResolveRewardGrantRowSchemaPath(string contractsDirectory) =>
        Path.GetFullPath(Path.Combine(contractsDirectory, "..", "schemas", "reward-grant-row.schema.json"));

    /// <summary>Resolves JSON Schema path for a quest skill XP grant row.</summary>
    public static string ResolveQuestSkillXpGrantSchemaPath(string contractsDirectory) =>
        Path.GetFullPath(Path.Combine(contractsDirectory, "..", "schemas", "quest-skill-xp-grant.schema.json"));

    /// <summary>Resolves JSON Schema path for a completion reward bundle.</summary>
    public static string ResolveQuestRewardBundleSchemaPath(string contractsDirectory) =>
        Path.GetFullPath(Path.Combine(contractsDirectory, "..", "schemas", "quest-reward-bundle.schema.json"));

    /// <summary>Resolves JSON Schema path for a faction gate rule row.</summary>
    public static string ResolveFactionGateRuleSchemaPath(string contractsDirectory) =>
        Path.GetFullPath(Path.Combine(contractsDirectory, "..", "schemas", "faction-gate-rule.schema.json"));

    /// <summary>Resolves JSON Schema path for a reputation grant row.</summary>
    public static string ResolveReputationGrantRowSchemaPath(string contractsDirectory) =>
        Path.GetFullPath(Path.Combine(contractsDirectory, "..", "schemas", "reputation-grant-row.schema.json"));
}