import { describe, expect, it } from "vitest";
import { parseMatchOutcome, rankCandidates } from "./match.js";

describe("parseMatchOutcome", () => {
    it("maps matches and drops bad episodeId", () => {
        const r = parseMatchOutcome({
            isMatched: true,
            matches: [{ episodeId: 12, animeTitle: "A", episodeTitle: "01" }, { episodeId: "x" }],
        });
        expect(r.isMatched).toBe(true);
        expect(r.candidates).toHaveLength(1);
        expect(r.candidates[0]?.episodeId).toBe(12);
    });
});

describe("rankCandidates", () => {
    it("single candidate is high confidence", () => {
        const r = rankCandidates([
            { episodeId: 1, animeId: 1, animeTitle: "A", episodeTitle: "01", imageUrl: null },
        ]);
        expect(r.highConfidence).toBe(true);
        expect(r.candidates).toHaveLength(1);
    });
    it("close scores are not high confidence", () => {
        const list = [
            { episodeId: 1, animeId: 1, animeTitle: "Show", episodeTitle: "01", imageUrl: null },
            { episodeId: 2, animeId: 1, animeTitle: "Show", episodeTitle: "01v2", imageUrl: null },
        ];
        const r = rankCandidates(list);
        expect(r.highConfidence).toBe(false);
    });
    it("empty candidates are not high confidence", () => {
        const r = rankCandidates([]);
        expect(r.highConfidence).toBe(false);
        expect(r.candidates).toEqual([]);
    });
    it("score gap >= default lead (0.15) is high confidence", () => {
        const list = [
            { episodeId: 2, animeId: 1, animeTitle: "Show", episodeTitle: null, imageUrl: "img" },
            { episodeId: 1, animeId: 1, animeTitle: "Show", episodeTitle: "01", imageUrl: null },
        ];
        const r = rankCandidates(list);
        expect(r.highConfidence).toBe(true);
        expect(r.candidates[0]?.episodeId).toBe(1);
    });
    it("custom lead is honored", () => {
        const list = [
            { episodeId: 2, animeId: 1, animeTitle: "Show", episodeTitle: null, imageUrl: "img" },
            { episodeId: 1, animeId: 1, animeTitle: "Show", episodeTitle: "01", imageUrl: null },
        ];
        expect(rankCandidates(list, { lead: 0.5 }).highConfidence).toBe(false);
        expect(rankCandidates(list, { lead: 0.3 }).highConfidence).toBe(true);
    });
    it("returns candidates sorted by score desc", () => {
        const hi = {
            episodeId: 1,
            animeId: 1,
            animeTitle: "A",
            episodeTitle: "01",
            imageUrl: "img",
        };
        const mid = {
            episodeId: 2,
            animeId: 1,
            animeTitle: "B",
            episodeTitle: "02",
            imageUrl: null,
        };
        const low = {
            episodeId: 3,
            animeId: null,
            animeTitle: null,
            episodeTitle: null,
            imageUrl: "x",
        };
        const r = rankCandidates([low, mid, hi]);
        expect(r.candidates.map((c) => c.episodeId)).toEqual([1, 2, 3]);
    });

    it("本地标题包含命中加分：多候选时命中者高置信", () => {
        const list = [
            { episodeId: 1, animeId: 1, animeTitle: "迷宫饭", episodeTitle: "01", imageUrl: null },
            { episodeId: 2, animeId: 2, animeTitle: "芙莉莲", episodeTitle: "01", imageUrl: null },
        ];
        const r = rankCandidates(list, { hint: { title: "葬送的芙莉莲" } });
        expect(r.highConfidence).toBe(true);
        expect(r.candidates[0]?.episodeId).toBe(2);
    });

    it("本地标题完全相等加分高于部分包含", () => {
        const list = [
            {
                episodeId: 1,
                animeId: 1,
                animeTitle: "命运石之门",
                episodeTitle: "01",
                imageUrl: null,
            },
            {
                episodeId: 2,
                animeId: 2,
                animeTitle: "命运石之门 负荷领域",
                episodeTitle: "01",
                imageUrl: null,
            },
        ];
        // 本地标题「命运石之门」：候选 1 完全相等(+1)，候选 2 为包含(+0.6)
        const r = rankCandidates(list, { hint: { title: "命运石之门" } });
        expect(r.highConfidence).toBe(true);
        expect(r.candidates[0]?.episodeId).toBe(1);
    });

    it("rawName 包含候选标题也加分", () => {
        const list = [
            { episodeId: 1, animeId: 1, animeTitle: "迷宫饭", episodeTitle: "01", imageUrl: null },
            { episodeId: 2, animeId: 2, animeTitle: "芙莉莲", episodeTitle: "01", imageUrl: null },
        ];
        const r = rankCandidates(list, {
            hint: { title: "本地标题", rawName: "[Sub] Sousou no Frieren - 01.mkv" },
        });
        // rawName 不含任一候选，无加分 → 同分不高置信
        expect(r.highConfidence).toBe(false);
        const r2 = rankCandidates(list, {
            hint: { title: "x", rawName: "[Sub] 芙莉莲 - 01.mkv" },
        });
        expect(r2.highConfidence).toBe(true);
        expect(r2.candidates[0]?.episodeId).toBe(2);
    });

    it("单字符候选名不参与包含命中，避免噪声加分", () => {
        const list = [
            { episodeId: 1, animeId: 1, animeTitle: "T", episodeTitle: "E", imageUrl: null },
            { episodeId: 2, animeId: 2, animeTitle: "T2", episodeTitle: "E2", imageUrl: null },
        ];
        const r = rankCandidates(list, {
            hint: { title: "Title", rawName: "Title - 01.mkv", epNumber: 1 },
        });
        expect(r.highConfidence).toBe(false);
    });

    it("集号相等加分拉开同标题候选差距", () => {
        const list = [
            { episodeId: 1, animeId: 1, animeTitle: "Show", episodeTitle: "02", imageUrl: null },
            { episodeId: 2, animeId: 1, animeTitle: "Show", episodeTitle: "01", imageUrl: null },
        ];
        const r = rankCandidates(list, { hint: { title: "Show", epNumber: 1 } });
        expect(r.highConfidence).toBe(true);
        expect(r.candidates[0]?.episodeId).toBe(2);
    });

    it("无 hint 时保持字段存在性打分（默认 lead 0.15）", () => {
        const list = [
            { episodeId: 1, animeId: 1, animeTitle: "迷宫饭", episodeTitle: "01", imageUrl: null },
            { episodeId: 2, animeId: 2, animeTitle: "芙莉莲", episodeTitle: "01", imageUrl: null },
        ];
        expect(rankCandidates(list).highConfidence).toBe(false);
    });
});