using System.Collections.Generic;
using System.Text.Json.Serialization;

namespace FrameworkDAL.DTO.EIPConversation
{
    public class EIPFlowStepDTO
    {
        public string StepCode { get; set; } = string.Empty;

        // MESSAGE | PROMPT | INPUT | CONDITION | CONDITIONAL | CAPABILITY | ACTION | CHOICE | EXTERNAL_ACTION | END
        public string StepType { get; set; } = string.Empty;

        public string? NextStepCode { get; set; }

        // ── Message rendering ──────────────────────────────────────────────
        public string? MessageTemplate { get; set; }

        /// <summary>Optional logical key into MEIPMESSAGETEMPLATE (TenantId, MessageKey,
        /// LanguageCode, ChannelType) — when set and a matching row exists, EIPResponseEngine
        /// uses the localized template instead of MessageTemplate. Falls back to MessageTemplate
        /// when unset or no row matches, so existing flow-JSON-authored messages are unaffected.</summary>
        public string? MessageKey { get; set; }

        // ── Capability (Phase 4) ───────────────────────────────────────────
        public string? CapabilityCode { get; set; }

        // ── ACTION step — CALL_API / TRIGGER_MESSAGEHUB / DB_UPDATE ───────
        public string? ActionType { get; set; }

        // For CALL_API: endpoint configuration
        public EIPApiConfig? ApiConfig { get; set; }

        // For TRIGGER_MESSAGEHUB: which entity template to trigger
        public int EntityId { get; set; }

        // Key in session context to store the API response
        public string? ContextKey { get; set; }

        // ── INPUT step — collect and validate user input ───────────────────
        public EIPStepValidation? Validation { get; set; }

        // ── CONDITIONAL step — multi-branch on context value ───────────────
        public string? ConditionKey { get; set; }
        public List<EIPStepCondition>? Conditions { get; set; }
        public string? DefaultNextStepCode { get; set; }

        // ── CHOICE step — menu-driven branching ───────────────────────────
        // Key = option label shown to user, Value = NextStepCode
        public Dictionary<string, string>? Choices { get; set; }

        // ── EXTERNAL_ACTION step — button-press decision map ───────────────
        // (kept for backward compatibility with Mode 1 flows)
        public Dictionary<string, object>? DecisionMap { get; set; }

        // ── Legacy condition expression (CONDITION step) ───────────────────
        public string? ConditionExpression { get; set; }

        // ── Terminal flag ──────────────────────────────────────────────────
        public bool IsTerminal { get; set; } = false;

        // ── Response presentation (CALL_API / PRESENT steps) ─────────────
        /// <summary>
        /// Declares how the API response should be parsed and structured for channel rendering.
        /// When set on a CALL_API step, the engine builds EIPStructuredDataDTO after the HTTP call.
        /// When set on a PRESENT step, the engine reads context.Variables[ContextKey] and builds it.
        /// Null (or Type=TEXT) means pass raw string through ResponseMessage only.
        /// </summary>
        public EIPResponseFormatDTO? ResponseFormat { get; set; }

        // ── QUALIFY step — GOP Qualifier + optional Mapper ────────────────
        public EIPQualifyConfigDTO? QualifyConfig { get; set; }

        // ── ENRICH step — GOP Mapper only ─────────────────────────────────
        public EIPEnrichConfigDTO? EnrichConfig { get; set; }

        // ── DYNAMIC_CHOICE step — choices from a stored API result ────────
        public EIPDynamicChoiceConfigDTO? DynamicChoiceConfig { get; set; }

        // ── QR code display (any step that returns a response) ────────────
        /// <summary>
        /// When set, the response includes a QR code encoding this string.
        /// Supports {VarKey} substitution. AppChat renders natively; other channels
        /// convert to a QR image URL via the configured QR service.
        /// </summary>
        public string? QrCodeData { get; set; }

        // ── Voice hint (MESSAGE/ACTION steps on Voice channel) ────────────
        /// <summary>SSML markup or plain-text TTS override. Used by VoiceChannelHandler.</summary>
        public string? VoiceHint { get; set; }

        // ── LINK step — send URL buttons without capturing a reply ────────
        public List<EIPLinkButtonDTO>? LinkButtons { get; set; }

        // ── Actions list (future extensibility) ───────────────────────────
        public List<EIPFlowActionDTO>? Actions { get; set; }

        public int? RetryCount { get; set; }

        public Dictionary<string, object>? Metadata { get; set; }
    }

    /// <summary>A URL button for LINK steps — tapping opens the URL without a conversation reply.</summary>
    public class EIPLinkButtonDTO
    {
        public string Title { get; set; } = "";
        public string Url { get; set; } = "";
    }

    public class EIPApiConfig
    {
        // ── Existing (backward-compatible) ─────────────────────────────────
        /// <summary>Full URL. Used when ServicePrefix is null. Supports {VarName} substitution.</summary>
        public string? Url { get; set; }
        public string Method { get; set; } = "GET";
        public Dictionary<string, string>? Headers { get; set; }
        /// <summary>JSON body template with {VarName} substitution. Used when Parameters is null.</summary>
        public string? BodyTemplate { get; set; }

        // ── New: YARP-routed internal GB5 calls ────────────────────────────
        /// <summary>
        /// YARP gateway prefix (e.g., "mms", "fws", "prs").
        /// When set, URL = login.BaseUri / ServicePrefix / PathTemplate.
        /// The YARP gateway strips the prefix and routes to the correct microservice.
        /// </summary>
        public string? ServicePrefix { get; set; }

        /// <summary>
        /// Path relative to the service prefix. Supports {VarName} substitution.
        /// Example: "/MMHead/SaveMMHead" or "/Leave/GetLeave/{LeaveId}"
        /// </summary>
        public string? PathTemplate { get; set; }

        // ── New: structured parameter definitions ──────────────────────────
        /// <summary>
        /// When populated, replaces BodyTemplate. Parameters are split into body, query,
        /// header, or path targets based on their In field, and values are resolved from
        /// FIXED literals, CONTEXT variables, or user INPUT collected in prior steps.
        /// </summary>
        public List<EIPParamDefinitionDTO>? Parameters { get; set; }
    }

    public class EIPStepValidation
    {
        public bool Required { get; set; }
        public string? Regex { get; set; }
        public string? ErrorMessage { get; set; }

        /// <summary>
        /// Input modality hint and server-side validation type.
        /// "text" (default) | "number" | "date" | "email" | "phone" | "qr_scan" | "file" | "rating"
        /// AppChat uses this to render the appropriate UI widget (date picker, camera, star rating, etc.).
        /// text-only channels always receive text; server validates format for number/date/email/phone/rating.
        /// </summary>
        public string InputType { get; set; } = "text";

        /// <summary>Maximum star value for InputType="rating". Default 5.</summary>
        public int? RatingMax { get; set; }

        /// <summary>Comma-separated accepted MIME types for InputType="file" (e.g. "image/jpeg,application/pdf").</summary>
        public string? AllowedFileTypes { get; set; }
    }

    public class EIPStepCondition
    {
        // EXISTS | NOT_EXISTS | EQUALS | NOT_EQUALS | IN | GT | LT
        public string Operator { get; set; } = string.Empty;
        public string? Value { get; set; }
        public List<string>? Values { get; set; }
        public string NextStepCode { get; set; } = string.Empty;
    }

    public class EIPFlowActionDTO
    {
        public string ActionType { get; set; } = string.Empty;
        public Dictionary<string, object>? Config { get; set; }
    }
}