using JdeScoping.Core.ApiContracts;
using JdeScoping.Core.ApiContracts.Pipelines;
using JdeScoping.Core.Models.Enums;
using JdeScoping.DataSync.Configuration;
using JdeScoping.DataSync.Contracts;
using JdeScoping.DataSync.Services;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;

namespace JdeScoping.Api.Controllers;

/// <summary>
/// API endpoints for pipeline configuration and status.
/// </summary>
[ApiController]
[Route(ApiRoutes.Pipelines.Base)]
[Authorize]
public class PipelineController : ControllerBase
{
    private readonly IEtlPipelineFactory _pipelineFactory;
    private readonly IDataUpdateRepository _dataUpdateRepository;

    public PipelineController(
        IEtlPipelineFactory pipelineFactory,
        IDataUpdateRepository dataUpdateRepository)
    {
        _pipelineFactory = pipelineFactory;
        _dataUpdateRepository = dataUpdateRepository;
    }

    /// <summary>
    /// Gets list of all available pipeline names.
    /// </summary>
    [HttpGet]
    public ActionResult<PipelineListResponse> GetPipelineNames()
    {
        var names = _pipelineFactory.GetAvailableTables()
            .OrderBy(n => n)
            .ToList();
        return Ok(new PipelineListResponse(names));
    }

    /// <summary>
    /// Gets configuration for a specific pipeline.
    /// </summary>
    [HttpGet(ApiRoutes.Pipelines.ByName)]
    public ActionResult<PipelineConfigDto> GetPipeline(string name)
    {
        var config = _pipelineFactory.GetPipelineConfig(name);
        if (config is null)
            return NotFound();

        var defaults = _pipelineFactory.GetScheduleDefaults();
        var dto = MapToDto(name, config, defaults);
        return Ok(dto);
    }

    /// <summary>
    /// Gets schedule status for a pipeline.
    /// </summary>
    [HttpGet(ApiRoutes.Pipelines.Status)]
    public async Task<ActionResult<PipelineStatusResponse>> GetStatus(
        string name,
        CancellationToken cancellationToken)
    {
        var config = _pipelineFactory.GetPipelineConfig(name);
        if (config is null)
            return NotFound();

        var tableName = config.Destination.Table;
        var lastRuns = await _dataUpdateRepository.GetLastRunsAsync(tableName, cancellationToken);
        var lastSuccessful = await _dataUpdateRepository.GetLastDataUpdatesAsync(cancellationToken);
        var defaults = _pipelineFactory.GetScheduleDefaults();

        var statuses = new List<PipelineScheduleStatusDto>();
        foreach (var updateType in new[] { UpdateTypes.Mass, UpdateTypes.Daily, UpdateTypes.Hourly })
        {
            var scheduleConfig = GetScheduleConfig(config, updateType);
            var interval = GetEffectiveInterval(scheduleConfig, defaults, updateType);

            lastRuns.TryGetValue(updateType, out var lastRun);
            var successKey = $"{tableName}_{(int)updateType}";
            lastSuccessful.TryGetValue(successKey, out var lastSuccess);

            var nextRequired = lastSuccess?.EndDt.AddMinutes(interval);
            var isOverdue = DataUpdateRepository.IsOverdue(
                lastSuccess?.EndDt, tableName, updateType, null);

            statuses.Add(new PipelineScheduleStatusDto(
                updateType,
                lastRun?.StartDt,
                lastRun?.WasSuccessful ?? false,
                lastSuccess?.EndDt,
                nextRequired,
                isOverdue,
                interval));
        }

        return Ok(new PipelineStatusResponse(statuses));
    }

    /// <summary>
    /// Gets recent execution history for a pipeline.
    /// </summary>
    [HttpGet(ApiRoutes.Pipelines.Executions)]
    public async Task<ActionResult<PipelineExecutionsResponse>> GetExecutions(
        string name,
        [FromQuery] int count = 30,
        CancellationToken cancellationToken = default)
    {
        var config = _pipelineFactory.GetPipelineConfig(name);
        if (config is null)
            return NotFound();

        var tableName = config.Destination.Table;
        var updates = await _dataUpdateRepository.GetRecentUpdatesAsync(
            tableName, null, count, cancellationToken);

        var executions = updates.Select(u => new PipelineExecutionDto(
            u.UpdateType,
            u.StartDt,
            u.EndDt == default ? null : u.EndDt,
            u.EndDt == default ? null : u.EndDt - u.StartDt,
            u.NumberRecords,
            u.WasSuccessful
        )).ToList();

        return Ok(new PipelineExecutionsResponse(executions));
    }

    private static PipelineConfigDto MapToDto(
        string name,
        PipelineConfig config,
        ScheduleDefaults defaults)
    {
        var source = new PipelineSourceDto(
            config.Source.Connection,
            Truncate(config.Source.Query),
            Truncate(config.Source.MassQuery),
            config.Source.Query,
            config.Source.MassQuery,
            config.Source.Parameters?.Select(p => new PipelineParameterDto(
                p.Key, p.Value.Format, p.Value.Source)).ToList() ?? []);

        var matchCols = config.Destination.MatchColumns?.ToList();
        var destination = new PipelineDestinationDto(
            config.Destination.Table,
            matchCols?.Count > 0 ? "BulkMerge" : "BulkImport",
            matchCols,
            config.Destination.ExcludeFromUpdate?.ToList());

        // Mass uses massQuery with no parameters; Daily/Hourly use query with parameters
        var parameters = config.Source.Parameters?.Select(p => new PipelineParameterDto(
            p.Key, p.Value.Format, p.Value.Source)).ToList() ?? [];

        var schedules = new PipelineSchedulesDto(
            MapSchedule(config.Schedules?.Mass, defaults.Mass, config.Source.MassQuery, [], config.PreScripts, config.PostScripts),
            MapSchedule(config.Schedules?.Daily, defaults.Daily, config.Source.Query, parameters, config.PreScripts, config.PostScripts),
            MapSchedule(config.Schedules?.Hourly, defaults.Hourly, config.Source.Query, parameters, config.PreScripts, config.PostScripts));

        return new PipelineConfigDto(
            name,
            source,
            destination,
            schedules,
            config.PreScripts?.Count ?? 0,
            config.PostScripts?.Count ?? 0,
            config.PreScripts,
            config.PostScripts);
    }

    private static PipelineScheduleDto MapSchedule(
        ScheduleConfig? config,
        ScheduleConfig defaults,
        string? query,
        List<PipelineParameterDto> parameters,
        List<string>? preScripts,
        List<string>? postScripts)
    {
        return new PipelineScheduleDto(
            config?.Enabled ?? defaults.Enabled,
            config?.IntervalMinutes > 0 ? config.IntervalMinutes : defaults.IntervalMinutes,
            config?.PrePurge ?? defaults.PrePurge,
            config?.ReIndex ?? defaults.ReIndex,
            config?.IntervalMinutes > 0 && config.IntervalMinutes != defaults.IntervalMinutes,
            config?.PrePurge != null && config.PrePurge != defaults.PrePurge,
            config?.ReIndex != null && config.ReIndex != defaults.ReIndex,
            query,
            parameters,
            preScripts,
            postScripts);
    }

    private static ScheduleConfig? GetScheduleConfig(
        PipelineConfig config,
        UpdateTypes updateType) => updateType switch
    {
        UpdateTypes.Mass => config.Schedules?.Mass,
        UpdateTypes.Daily => config.Schedules?.Daily,
        UpdateTypes.Hourly => config.Schedules?.Hourly,
        _ => null
    };

    private static int GetEffectiveInterval(
        ScheduleConfig? config,
        ScheduleDefaults defaults,
        UpdateTypes updateType)
    {
        if (config?.IntervalMinutes > 0)
            return config.IntervalMinutes;

        return updateType switch
        {
            UpdateTypes.Mass => defaults.Mass.IntervalMinutes,
            UpdateTypes.Daily => defaults.Daily.IntervalMinutes,
            UpdateTypes.Hourly => defaults.Hourly.IntervalMinutes,
            _ => 60
        };
    }

    private static string? Truncate(string? value, int maxLength = 100) =>
        value is null ? null :
        value.Length <= maxLength ? value : value[..maxLength] + "...";
}