using Microsoft.Data.SqlClient;
using OrpaonVision.ConfigApp.Infrastructure.Persistence.Options;
using OrpaonVision.Core.Abstractions;
using OrpaonVision.Core.Results;

namespace OrpaonVision.ConfigApp.Infrastructure.Persistence;

/// <summary>
/// SQL Server 数据存储初始化器。
/// </summary>
public sealed class SqlServerDataStoreInitializer : IDataStoreInitializer
{
    private readonly PersistenceOptions _options;
    private readonly IAppLogger _logger;

    /// <summary>
    /// 构造函数。
    /// </summary>
    public SqlServerDataStoreInitializer(PersistenceOptions options, IAppLogger logger)
    {
        _options = options;
        _logger = logger;
    }

    /// <inheritdoc />
    public Result Initialize()
    {
        if (string.IsNullOrWhiteSpace(_options.ConnectionString))
        {
            return Result.Fail("DATASTORE_CONNECTIONSTRING_EMPTY", "数据库连接字符串未配置。", "请在 appsettings 中配置 Persistence:ConnectionString。");
        }

        try
        {
            using var connection = new SqlConnection(_options.ConnectionString);
            connection.Open();

            using var command = connection.CreateCommand();
            command.CommandText = BuildCreateTableScript();
            command.ExecuteNonQuery();

            return Result.Success("DATASTORE_INIT_OK", "数据库初始化完成。基础表已就绪。");
        }
        catch (Exception ex)
        {
            var traceId = Guid.NewGuid().ToString("N");
            _logger.LogError("数据库初始化失败。", ex, traceId);
            return Result.FromException(ex, "DATASTORE_INIT_FAILED", "数据库初始化失败。", traceId);
        }
    }

    private static string BuildCreateTableScript()
    {
        return @"
IF OBJECT_ID(N'dbo.mdl_annotation_task', N'U') IS NULL
BEGIN
    CREATE TABLE dbo.mdl_annotation_task
    (
        id BIGINT IDENTITY(1,1) NOT NULL PRIMARY KEY,
        task_code NVARCHAR(64) NOT NULL,
        task_name NVARCHAR(200) NOT NULL,
        platform_type INT NOT NULL,
        external_task_id NVARCHAR(64) NULL,
        dataset_id BIGINT NOT NULL DEFAULT(0),
        label_set_id BIGINT NOT NULL DEFAULT(0),
        assigned_to NVARCHAR(64) NULL,
        status INT NOT NULL DEFAULT(0),
        progress_percent DECIMAL(5,2) NULL,
        sync_status INT NOT NULL DEFAULT(0),
        created_at DATETIME2(3) NOT NULL,
        created_by NVARCHAR(64) NULL,
        updated_at DATETIME2(3) NULL,
        updated_by NVARCHAR(64) NULL,
        cvat_project_id BIGINT NULL,
        item_count INT NOT NULL DEFAULT(0),
        task_status_text NVARCHAR(64) NULL,
        updated_at_utc DATETIME2(3) NULL
    );

    CREATE UNIQUE INDEX UX_mdl_annotation_task_task_code ON dbo.mdl_annotation_task(task_code);
    CREATE UNIQUE INDEX UX_mdl_annotation_task_external_task_id ON dbo.mdl_annotation_task(external_task_id) WHERE external_task_id IS NOT NULL;
END

IF OBJECT_ID(N'dbo.cfg_product_type_draft', N'U') IS NULL
BEGIN
    CREATE TABLE dbo.cfg_product_type_draft
    (
        id BIGINT IDENTITY(1,1) NOT NULL PRIMARY KEY,
        product_type_code NVARCHAR(64) NOT NULL,
        product_type_name NVARCHAR(128) NOT NULL,
        draft_json NVARCHAR(MAX) NOT NULL,
        updated_at DATETIME2(3) NOT NULL,
        updated_by NVARCHAR(64) NULL
    );

    CREATE UNIQUE INDEX UX_cfg_product_type_draft_code ON dbo.cfg_product_type_draft(product_type_code);
END

IF OBJECT_ID(N'dbo.cfg_rule_version', N'U') IS NULL
BEGIN
    CREATE TABLE dbo.cfg_rule_version
    (
        id BIGINT IDENTITY(1,1) NOT NULL PRIMARY KEY,
        product_type_code NVARCHAR(64) NOT NULL,
        version_no NVARCHAR(64) NOT NULL,
        snapshot_json NVARCHAR(MAX) NOT NULL,
        published_at_utc DATETIME2(3) NOT NULL,
        published_by NVARCHAR(64) NOT NULL
    );

    CREATE UNIQUE INDEX UX_cfg_rule_version_code_version ON dbo.cfg_rule_version(product_type_code, version_no);
END

IF OBJECT_ID(N'dbo.cfg_rule_version_audit', N'U') IS NULL
BEGIN
    CREATE TABLE dbo.cfg_rule_version_audit
    (
        id BIGINT IDENTITY(1,1) NOT NULL PRIMARY KEY,
        product_type_code NVARCHAR(64) NOT NULL,
        action_type NVARCHAR(32) NOT NULL,
        version_no NVARCHAR(64) NULL,
        source_version_no NVARCHAR(64) NULL,
        target_version_no NVARCHAR(64) NULL,
        operator_name NVARCHAR(64) NOT NULL,
        action_at_utc DATETIME2(3) NOT NULL,
        detail_json NVARCHAR(MAX) NULL
    );

    CREATE INDEX IX_cfg_rule_version_audit_code_time ON dbo.cfg_rule_version_audit(product_type_code, action_at_utc DESC);
END
";
    }
}