using System.Collections.Generic;
using System.Linq;

namespace HC_APTBS.Models
{
    // BIP (Begin of Injection Period) status definitions.
    // Applies only to pre-injection PSG5-PI pumps (Type 2 T15xxx / Type 3 T18xxx Ford).
    // Null on standard VP44 pumps.
    // Data source: KWP RAM read of ADR-S_BIP_HW_UW at address 0x0106 (16-bit unsigned).

    /// <summary>
    /// One BIP-STATUS entry: a 16-bit HEX pattern matched against the captured BIP
    /// status word, together with the reaction to apply on a match.
    /// </summary>
    public class BipStatusDefinition
    {
        /// <summary>Zero-based definition index (BIP-STATUS0 = 0 … BIP-STATUS7 = 7).</summary>
        public int Index { get; set; }

        /// <summary>Whether this definition participates in pattern matching.</summary>
        public bool Enabled { get; set; } = true;

        /// <summary>
        /// 16-bit nibble pattern compared against the captured BIP status word.
        /// Legacy examples: 0x0000 = BIP OK, 0x000F = no BIP in window,
        /// 0x00F0 = no BIP + MV off, 0x0F00 = no MV drive, 0xF00F = deviation too large.
        /// </summary>
        public ushort HexPattern { get; set; }

        /// <summary>
        /// Reaction code applied on match:
        /// 0 = none, 1 = abort (emergency stop), 2 = warning, 3 = log-only.
        /// </summary>
        public int Reaction { get; set; } = 0;

        /// <summary>
        /// Special-function marker from legacy CFG:
        /// 9 = standard handling, 0xB = Ford timing-correction (Type 3 only).
        /// </summary>
        public int SpecialFunction { get; set; } = 9;

        /// <summary>Human-readable description shown on match.</summary>
        public string Description { get; set; } = string.Empty;
    }

    /// <summary>
    /// Per-pump BIP status container. Holds up to 8 <see cref="BipStatusDefinition"/>
    /// entries (max by legacy convention; not validated).
    /// </summary>
    public class PumpBipDefinition
    {
        /// <summary>Ordered BIP status definitions (max 8).</summary>
        public List<BipStatusDefinition> Bits { get; set; } = new();

        /// <summary>
        /// Returns the first enabled definition whose <see cref="BipStatusDefinition.HexPattern"/>
        /// matches <paramref name="value"/> via bitmask semantics: all bits set in the pattern
        /// must be set in the captured word (<c>(value &amp; pattern) == pattern</c>).
        /// Pattern 0x0000 matches any value (OK state by convention in the legacy CFG).
        /// </summary>
        public BipStatusDefinition? Match(ushort value) =>
            Bits.FirstOrDefault(b => b.Enabled && (value & b.HexPattern) == b.HexPattern);
    }
}