import VeIcon from "vue-easytable/packages/ve-icon";
import { clsName } from "./util";
import { LOCALE_COMP_NAME } from "./util/constant";
import { createLocale } from "../../src/utils/index";
import { ICON_NAMES } from "../../src/utils/constant";
const t = createLocale(LOCALE_COMP_NAME);

export default {
    props: {
        pageCount: {
            type: Number,
            required: true,
        },
        pageIndex: {
            type: Number,
            required: true,
        },
        pagingCount: {
            type: Number,
            required: true,
        },
    },
    computed: {
        numOffset() {
            return Math.floor((this.pagingCount + 2) / 2) - 1;
        },

        showJumpPrev() {
            if (this.pageCount > this.pagingCount + 2) {
                if (this.pageIndex > this.pagingCount) {
                    return true;
                }
            }
            return false;
        },

        showJumpNext() {
            if (this.pageCount > this.pagingCount + 2) {
                //if (this.pageIndex < this.pageCount - this.numOffset) {
                if (this.pageIndex <= this.pageCount - this.pagingCount) {
                    return true;
                }
            }
            return false;
        },

        // 当前要显示的数字按钮集合
        pagingCounts() {
            let startNum,
                result = [],
                showJumpPrev = this.showJumpPrev,
                showJumpNext = this.showJumpNext;

            if (showJumpPrev && !showJumpNext) {
                startNum = this.pageCount - this.pagingCount;
                for (let i = startNum; i < this.pageCount; i++) {
                    result.push(i);
                }
            } else if (!showJumpPrev && showJumpNext) {
                for (let i = 2; i < this.pagingCount + 2; i++) {
                    result.push(i);
                }
            } else if (showJumpPrev && showJumpNext) {
                for (
                    let i = this.pageIndex - this.numOffset;
                    i <= this.pageIndex + this.numOffset;
                    i++
                ) {
                    result.push(i);
                }
            } else {
                for (let i = 2; i < this.pageCount; i++) {
                    result.push(i);
                }
            }

            return result;
        },
    },
    methods: {
        jumpPage(pageIndex) {
            this.$emit("jumpPageHandler", pageIndex);
        },
    },
    render() {
        const {
            pageIndex,
            jumpPage,
            showJumpPrev,
            pagingCount,
            pagingCounts,
            showJumpNext,
            pageCount,
        } = this;

        return (
            <span class={clsName("pager")}>
                <li
                    class={[
                        pageIndex === 1 ? clsName("li-active") : "",
                        clsName("li"),
                    ]}
                    on-click={() => jumpPage(1)}
                >
                    <a>1</a>
                </li>

                {showJumpPrev && (
                    <li
                        class={[
                            pageIndex === 1 ? "disabled" : "",
                            clsName("li"),
                            clsName("jump-prev"),
                        ]}
                        title={t("prev5", pagingCount)}
                        on-click={() => jumpPage(pageIndex - pagingCount)}
                    >
                        <a>
                            <VeIcon name={ICON_NAMES.DOUBLE_LEFT_ARROW} />
                        </a>
                    </li>
                )}
                {pagingCounts.map((number, index) => {
                    return (
                        <li
                            key={index}
                            class={[
                                number === pageIndex
                                    ? clsName("li-active")
                                    : "",
                                clsName("li"),
                            ]}
                            on-click={() => jumpPage(number)}
                        >
                            <a>{number}</a>
                        </li>
                    );
                })}

                {showJumpNext && (
                    <li
                        class={[clsName("li"), clsName("jump-next")]}
                        title={t("next5", pagingCount)}
                        on-click={() => jumpPage(pageIndex + pagingCount)}
                    >
                        <a>
                            <VeIcon name={ICON_NAMES.DOUBLE_RIGHT_ARROW} />
                        </a>
                    </li>
                )}

                {pageCount > 1 && (
                    <li
                        class={[
                            pageIndex === pageCount ? clsName("li-active") : "",
                            clsName("li"),
                        ]}
                        on-click={() => jumpPage(pageCount)}
                    >
                        <a>{pageCount}</a>
                    </li>
                )}
            </span>
        );
    },
};