import * as VersiaEntities from "@versia/sdk/entities";
import { config } from "@versia-server/config";
import { randomUUIDv7 } from "bun";
import {
    and,
    desc,
    eq,
    type InferInsertModel,
    type InferSelectModel,
    inArray,
    isNull,
    type SQL,
} from "drizzle-orm";
import { db } from "../tables/db.ts";
import {
    type Instances,
    type Notes,
    Reactions,
    type Users,
} from "../tables/schema.ts";
import { BaseInterface } from "./base.ts";
import { Emoji } from "./emoji.ts";
import { Instance } from "./instance.ts";
import type { Note } from "./note.ts";
import type { User } from "./user.ts";

type ReactionType = InferSelectModel<typeof Reactions> & {
    emoji: typeof Emoji.$type | null;
    author: InferSelectModel<typeof Users> & {
        instance: InferSelectModel<typeof Instances> | null;
    };
    note: InferSelectModel<typeof Notes> & {
        author: InferSelectModel<typeof Users> & {
            instance: InferSelectModel<typeof Instances> | null;
        };
    };
};

export class Reaction extends BaseInterface<typeof Reactions, ReactionType> {
    public static $type: ReactionType;

    public async reload(): Promise<void> {
        const reloaded = await Reaction.fromId(this.data.id);

        if (!reloaded) {
            throw new Error("Failed to reload reaction");
        }

        this.data = reloaded.data;
    }

    public static async fromId(id: string | null): Promise<Reaction | null> {
        if (!id) {
            return null;
        }

        return await Reaction.fromSql(eq(Reactions.id, id));
    }

    public static async fromIds(ids: string[]): Promise<Reaction[]> {
        return await Reaction.manyFromSql(inArray(Reactions.id, ids));
    }

    public static async fromSql(
        sql: SQL<unknown> | undefined,
        orderBy: SQL<unknown> | undefined = desc(Reactions.id),
    ): Promise<Reaction | null> {
        const found = await db.query.Reactions.findFirst({
            where: sql,
            with: {
                emoji: {
                    with: {
                        instance: true,
                        media: true,
                    },
                },
                author: {
                    with: {
                        instance: true,
                    },
                },
                note: {
                    with: {
                        author: {
                            with: {
                                instance: true,
                            },
                        },
                    },
                },
            },
            orderBy,
        });

        if (!found) {
            return null;
        }
        return new Reaction(found);
    }

    public static async manyFromSql(
        sql: SQL<unknown> | undefined,
        orderBy: SQL<unknown> | undefined = desc(Reactions.id),
        limit?: number,
        offset?: number,
        extra?: Parameters<typeof db.query.Reactions.findMany>[0],
    ): Promise<Reaction[]> {
        const found = await db.query.Reactions.findMany({
            where: sql,
            orderBy,
            limit,
            offset,
            with: {
                ...extra?.with,
                emoji: {
                    with: {
                        instance: true,
                        media: true,
                    },
                },
                author: {
                    with: {
                        instance: true,
                    },
                },
                note: {
                    with: {
                        author: {
                            with: {
                                instance: true,
                            },
                        },
                    },
                },
            },
        });

        return found.map((s) => new Reaction(s));
    }

    public async update(
        newReaction: Partial<ReactionType>,
    ): Promise<ReactionType> {
        await db
            .update(Reactions)
            .set(newReaction)
            .where(eq(Reactions.id, this.id));

        const updated = await Reaction.fromId(this.data.id);

        if (!updated) {
            throw new Error("Failed to update reaction");
        }

        this.data = updated.data;
        return updated.data;
    }

    public save(): Promise<ReactionType> {
        return this.update(this.data);
    }

    public async delete(ids?: string[]): Promise<void> {
        if (Array.isArray(ids)) {
            await db.delete(Reactions).where(inArray(Reactions.id, ids));
        } else {
            await db.delete(Reactions).where(eq(Reactions.id, this.id));
        }
    }

    public static async insert(
        data: InferInsertModel<typeof Reactions>,
    ): Promise<Reaction> {
        // Needs one of emojiId or emojiText, but not both
        if (!(data.emojiId || data.emojiText)) {
            throw new Error("EmojiID or emojiText is required");
        }

        if (data.emojiId && data.emojiText) {
            throw new Error("Cannot have both emojiId and emojiText");
        }

        const inserted = (
            await db.insert(Reactions).values(data).returning()
        )[0];

        const reaction = await Reaction.fromId(inserted.id);

        if (!reaction) {
            throw new Error("Failed to insert reaction");
        }

        return reaction;
    }

    public get id(): string {
        return this.data.id;
    }

    public static fromEmoji(
        emoji: Emoji | string,
        author: User,
        note: Note,
    ): Promise<Reaction | null> {
        if (emoji instanceof Emoji) {
            return Reaction.fromSql(
                and(
                    eq(Reactions.authorId, author.id),
                    eq(Reactions.noteId, note.id),
                    isNull(Reactions.emojiText),
                    eq(Reactions.emojiId, emoji.id),
                ),
            );
        }

        return Reaction.fromSql(
            and(
                eq(Reactions.authorId, author.id),
                eq(Reactions.noteId, note.id),
                eq(Reactions.emojiText, emoji),
                isNull(Reactions.emojiId),
            ),
        );
    }

    public getUri(): URL {
        const domain = this.data.note.author.instance?.domain
            ? new URL(`https://${this.data.note.author.instance.domain}`)
            : config.http.base_url;

        return new URL(
            `/.versia/v0.6/entities/${encodeURIComponent(
                "pub.versia:reactions/Reaction",
            )}/${this.id}`,
            domain,
        );
    }

    public get local(): boolean {
        return this.data.author.instanceId === null;
    }

    public hasCustomEmoji(): boolean {
        return !!this.data.emoji || !this.data.emojiText;
    }

    public toVersia(): VersiaEntities.Reaction {
        if (!this.local) {
            throw new Error("Cannot convert a non-local reaction to Versia");
        }

        let noteReference = this.data.note.id;

        if (this.data.note.author.instance) {
            noteReference = `${this.data.note.author.instance.domain}:${this.data.note.remoteId}`;
        }

        return new VersiaEntities.Reaction(
            {
                type: "pub.versia:reactions/Reaction",
                author: this.data.author.id,
                created_at: this.data.createdAt.toISOString(),
                id: this.id,
                object: noteReference,
                content: this.hasCustomEmoji()
                    ? `:${this.data.emoji?.shortcode}:`
                    : this.data.emojiText || "",
                extensions: this.hasCustomEmoji()
                    ? {
                          "pub.versia:custom_emojis": {
                              emojis: [
                                  new Emoji(
                                      this.data.emoji as typeof Emoji.$type,
                                  ).toVersia(),
                              ],
                          },
                      }
                    : undefined,
            },
            this.data.author.instance?.domain ?? config.http.base_url.hostname,
        );
    }

    public toVersiaUnreact(): VersiaEntities.Delete {
        return new VersiaEntities.Delete(
            {
                type: "Delete",
                created_at: new Date().toISOString(),
                author: this.data.authorId,
                deleted_type: "pub.versia:reactions/Reaction",
                deleted: this.id,
            },
            this.data.author.instance?.domain ?? config.http.base_url.hostname,
        );
    }

    public static async fromVersia(
        reactionToConvert: VersiaEntities.Reaction,
        author: User,
        note: Note,
    ): Promise<Reaction> {
        if (author.local) {
            throw new Error("Cannot process a reaction from a local user");
        }

        const emojiEntity =
            reactionToConvert.data.extensions?.["pub.versia:custom_emojis"]
                ?.emojis[0];
        const emoji = emojiEntity
            ? await Emoji.fetchFromRemote(
                  emojiEntity,
                  new Instance(
                      author.data.instance as NonNullable<
                          (typeof User.$type)["instance"]
                      >,
                  ),
              )
            : null;

        return Reaction.insert({
            id: randomUUIDv7(),
            remoteId: reactionToConvert.data.id,
            authorId: author.id,
            noteId: note.id,
            emojiId: emoji ? emoji.id : null,
            emojiText: emoji ? null : reactionToConvert.data.content,
        });
    }
}