// MatchPropCommand — two-phase match properties.
//
// Phase 1: user picks the SOURCE object (single entity pick).
// Phase 2: user selects DESTINATION objects (multi-select, Enter to finish).
// Result:  CmdResult::MatchProperties { dest, src }

use acadrust::Handle;
use glam::Vec3;

use crate::command::{CadCommand, CmdResult};
use crate::scene::wire_model::WireModel;

pub struct MatchPropCommand {
    /// Source handle; NULL until phase 1 is complete.
    src: Handle,
}

impl MatchPropCommand {
    pub fn new() -> Self {
        Self { src: Handle::NULL }
    }

    fn phase1_done(&self) -> bool {
        !self.src.is_null()
    }
}

impl CadCommand for MatchPropCommand {
    fn name(&self) -> &'static str {
        "MATCHPROP"
    }

    fn prompt(&self) -> String {
        if !self.phase1_done() {
            "MATCHPROP  Select source object:".into()
        } else {
            "MATCHPROP  Select destination objects (Enter to apply):".into()
        }
    }

    // ── Phase 1: single entity pick ───────────────────────────────────────

    fn needs_entity_pick(&self) -> bool {
        !self.phase1_done()
    }

    fn on_entity_pick(&mut self, handle: Handle, _pt: Vec3) -> CmdResult {
        if handle.is_null() {
            return CmdResult::NeedPoint; // nothing hit, keep waiting
        }
        self.src = handle;
        CmdResult::NeedPoint // move to phase 2 (selection gathering)
    }

    // ── Phase 2: destination selection gathering ──────────────────────────

    fn is_selection_gathering(&self) -> bool {
        self.phase1_done()
    }

    fn on_selection_complete(&mut self, handles: Vec<Handle>) -> CmdResult {
        if handles.is_empty() {
            return CmdResult::NeedPoint;
        }
        CmdResult::MatchProperties {
            dest: handles,
            src: self.src,
        }
    }

    fn on_enter(&mut self) -> CmdResult {
        CmdResult::Cancel
    }

    fn on_point(&mut self, _pt: Vec3) -> CmdResult {
        CmdResult::NeedPoint
    }

    fn on_hover_entity(&mut self, _handle: Handle, _pt: Vec3) -> Vec<WireModel> {
        vec![]
    }
}