"use client";

import { UndoAction } from "@/lib/useEditorState";

type Mode = "draw" | "select" | "idle" | "add-point";

type Props = {
    mode: Mode;
    setMode: (mode: Mode) => void;
    onUndo: () => void;
    onSave: () => void;
    isSaving: boolean;
    changesCount: number;
    undoStack: UndoAction[];
};

export default function Editor({
                                   mode,
                                   setMode,
                                   onUndo,
                                   onSave,
                                   isSaving,
                                   changesCount,
                                   undoStack,
                               }: Props) {
    const toggleMode = (newMode: Mode) => {
        if (mode === newMode) {
            setMode("idle"); // bấm lại → tắt
        } else {
            setMode(newMode); // chuyển mode
        }
    };

    // Lấy tối đa 8 tác vụ mới nhất, bỏ trùng nhãn (cùng loại/cùng id)
    const recentUndoLabels = (() => {
        const seen = new Set<string>();
        const labels: string[] = [];
        for (let i = undoStack.length - 1; i >= 0 && labels.length < 8; i -= 1) {
            const label = formatUndoLabel(undoStack[i]);
            if (seen.has(label)) continue;
            seen.add(label);
            labels.push(label);
        }
        return labels.reverse();
    })();

    const getButtonStyle = (btnMode: Mode) => ({
        width: "100%",
        padding: "8px",
        marginBottom: "6px",
        border: "none",
        cursor: "pointer",
        background: mode === btnMode ? "#4caf50" : "#222",
        color: "white",
        borderRadius: "4px",
    });

    return (
        <div
            style={{
                width: "220px",
                background: "#111",
                color: "white",
                padding: "12px",
                borderRight: "1px solid #333",
            }}
        >
            <h3 style={{ marginBottom: "10px" }}>Editor</h3>

            <button
                style={getButtonStyle("draw")}
                onClick={() => toggleMode("draw")}
            >
                Draw
            </button>

            <button
                style={getButtonStyle("select")}
                onClick={() => toggleMode("select")}
            >
                Select
            </button>

            <button
                style={getButtonStyle("idle")}
                onClick={() => setMode("idle")}
            >
                Idle
            </button>

            <button
                style={getButtonStyle("add-point")}
                onClick={() => setMode("add-point")}
            >
                Add point
            </button>

            <div style={{ marginTop: "12px", fontSize: "14px" }}>
                Mode: <b>{mode}</b>
            </div>

            <div style={{ marginTop: "12px", display: "flex", gap: "8px" }}>
                <button
                    style={{
                        flex: 1,
                        padding: "8px",
                        borderRadius: "4px",
                        border: "none",
                        cursor: "pointer",
                        background: "#334155",
                        color: "white",
                    }}
                    onClick={onUndo}
                >
                    Undo
                </button>
                <button
                    style={{
                        flex: 1,
                        padding: "8px",
                        borderRadius: "4px",
                        border: "none",
                        cursor: isSaving ? "not-allowed" : "pointer",
                        background: isSaving ? "#555" : "#3b82f6",
                        color: "white",
                        opacity: changesCount === 0 ? 0.6 : 1,
                    }}
                    onClick={onSave}
                    disabled={isSaving || changesCount === 0}
                >
                    Save ({changesCount})
                </button>
            </div>

            <div
                style={{
                    marginTop: "16px",
                    padding: "10px",
                    background: "#0b1220",
                    borderRadius: "6px",
                    border: "1px solid #1f2937",
                }}
            >
                <div style={{ marginBottom: "6px", fontWeight: 600, fontSize: "14px" }}>
                    Tác vụ có thể undo ({recentUndoLabels.length})
                </div>
                {recentUndoLabels.length === 0 ? (
                    <div style={{ color: "#94a3b8", fontSize: "13px" }}>Chưa có thao tác</div>
                ) : (
                    <ul style={{ listStyle: "none", margin: 0, padding: 0, fontSize: "13px", color: "#e2e8f0" }}>
                        {recentUndoLabels.map((label, idx) => (
                            <li key={`${label}-${idx}`} style={{ padding: "4px 0", borderBottom: "1px solid #1f2937" }}>
                                {label}
                            </li>
                        ))}
                    </ul>
                )}
            </div>
        </div>
    );
}

function formatUndoLabel(action: UndoAction) {
    switch (action.type) {
        case "create":
            return `Thêm mới #${action.id}`;
        case "delete":
            return `Xóa #${action.feature.properties.id}`;
        case "update":
            return `Chỉnh sửa #${action.id}`;
        default:
            return "Tác vụ";
    }
}