import { Injectable } from "@nestjs/common";
import { ExperienceDto, ExperienceType } from "@/experiences/experiences.types";
import { SkillsService } from "@/skills/skills.service";
import { experiences } from "@/experiences/experiences";
import { SkillDto } from "@/skills/skills.types";

@Injectable()
export class ExperiencesService {
    private readonly experiences: ReadonlyArray<ExperienceDto>;

    constructor(
            private readonly skillsService: SkillsService
    ) {
        this.experiences = ExperienceDto.asDto(this.linkSkills(experiences))
                .sort((experienceA, experienceB) => experienceA.startDate > experienceB.startDate ? 1 : -1);
    }

    getMany(filter?: Partial<Omit<ExperienceType, "startDate" | "endDate" | "skills">>) {
        const filtersValues = Object.entries(filter ?? {}).map(([key, filterValue]) => ([key, new RegExp(filterValue, "i")])) as [keyof Omit<ExperienceType, "startDate" | "endDate" | "skills">, RegExp][];
        if (!filter || filtersValues.length === 0) {
            return this.experiences;
        }

        return this.experiences.filter((experience) => filtersValues.every(([key, filterValue]) => filterValue.test(experience[key])));
    }

    private linkSkills(experiences: ExperienceType[]): Array<ExperienceType & {  skills: ReadonlyArray<SkillDto> }> {
        return experiences.map((experience) => {
            return {
                ...experience,
                skills: experience.skills.map(partialSkill => this.skillsService.getMany(partialSkill)).flat()
            }
        })
    }
}