import { API_ENDPOINTS } from "@/api/config";
import { jsonRequestInit, requestJson } from "@/api/http";

export type SectionState = {
    section_id?: string;
    status: "editing" | "submitted" | "approved" | "rejected";
    head_commit_id: string | null;
    version: number;
    locked_by: string | null;
    locked_at: string | null;
    lock_expires_at: string | null;
    updated_at?: string;
};

export type Section = {
    id: string;
    title: string;
    description: string | null;
    user_id: string | null;
    created_by: string | null;
    created_at: string;
    updated_at: string;
    state: Omit<SectionState, "section_id" | "updated_at">;
};

export type SectionCommit = {
    id: string;
    section_id: string;
    parent_commit_id: string | null;
    commit_no: number;
    kind: "manual" | "restore";
    restored_from_commit_id: string | null;
    created_by: string;
    created_at: string;
    title: string | null;
    note: string | null;
    snapshot_hash: string | null;
    snapshot?: unknown;
};

export type SectionSubmission = {
    id: string;
    section_id: string;
    commit_id: string;
    submitted_by: string;
    submitted_at: string;
    status: "pending" | "approved" | "rejected" | "conflicted";
    reviewed_by: string | null;
    reviewed_at: string | null;
    review_note: string | null;
    snapshot_hash: string | null;
    snapshot?: unknown;
};

export type EditorLoadResponse = {
    section: Section;
    state: SectionState;
    commit: SectionCommit | null;
    snapshot: unknown;
};

export type CreateSectionInput = {
    id?: string;
    title: string;
    description?: string | null;
    user_id?: string;
    created_by?: string;
};

export type CreateCommitInput = {
    snapshot: unknown;
    created_by?: string;
    user_id?: string;
    expected_version?: number;
    expected_head_commit_id?: string | null;
    title?: string | null;
    note?: string | null;
};

export async function fetchSections(): Promise<Section[]> {
    return requestJson<Section[]>(API_ENDPOINTS.sections);
}

export async function createSection(input: CreateSectionInput): Promise<Section> {
    return requestJson<Section>(API_ENDPOINTS.sections, jsonRequestInit("POST", input));
}

export async function openSectionEditor(sectionId: string, userId?: string): Promise<EditorLoadResponse> {
    const params = new URLSearchParams();
    if (userId) params.set("user_id", userId);
    return requestJson<EditorLoadResponse>(sectionUrl(sectionId, "editor", params));
}

export async function lockSection(sectionId: string, userId: string): Promise<{ state: SectionState }> {
    return requestJson<{ state: SectionState }>(
        sectionUrl(sectionId, "lock"),
        jsonRequestInit("POST", { user_id: userId })
    );
}

export async function unlockSection(sectionId: string, userId: string): Promise<{ success: boolean }> {
    return requestJson<{ success: boolean }>(
        sectionUrl(sectionId, "unlock"),
        jsonRequestInit("POST", { user_id: userId })
    );
}

export async function createSectionCommit(
    sectionId: string,
    input: CreateCommitInput
): Promise<{ commit: SectionCommit; state: SectionState }> {
    return requestJson<{ commit: SectionCommit; state: SectionState }>(
        sectionUrl(sectionId, "commits"),
        jsonRequestInit("POST", input)
    );
}

export async function fetchSectionCommits(
    sectionId: string,
    options?: { includeSnapshot?: boolean }
): Promise<SectionCommit[]> {
    const params = new URLSearchParams();
    if (options?.includeSnapshot) params.set("include_snapshot", "1");
    return requestJson<SectionCommit[]>(sectionUrl(sectionId, "commits", params));
}

export async function restoreSectionCommit(
    sectionId: string,
    input: {
        commit_id: string;
        created_by?: string;
        user_id?: string;
        expected_version?: number;
        expected_head_commit_id?: string | null;
        title?: string | null;
        note?: string | null;
    }
): Promise<{ commit: SectionCommit; state: SectionState }> {
    return requestJson<{ commit: SectionCommit; state: SectionState }>(
        sectionUrl(sectionId, "restore"),
        jsonRequestInit("POST", input)
    );
}

export async function submitSection(
    sectionId: string,
    input: { commit_id?: string; submitted_by?: string; user_id?: string }
): Promise<SectionSubmission> {
    return requestJson<SectionSubmission>(sectionUrl(sectionId, "submit"), jsonRequestInit("POST", input));
}

export async function fetchSectionSubmissions(
    sectionId: string,
    options?: { includeSnapshot?: boolean }
): Promise<SectionSubmission[]> {
    const params = new URLSearchParams();
    if (options?.includeSnapshot) params.set("include_snapshot", "1");
    return requestJson<SectionSubmission[]>(sectionUrl(sectionId, "submissions", params));
}

export async function approveSubmission(
    submissionId: string,
    input: { reviewed_by?: string; user_id?: string; review_note?: string | null }
): Promise<SectionSubmission> {
    return requestJson<SectionSubmission>(
        submissionUrl(submissionId, "approve"),
        jsonRequestInit("POST", input)
    );
}

export async function rejectSubmission(
    submissionId: string,
    input: { reviewed_by?: string; user_id?: string; review_note?: string | null }
): Promise<SectionSubmission> {
    return requestJson<SectionSubmission>(
        submissionUrl(submissionId, "reject"),
        jsonRequestInit("POST", input)
    );
}

function sectionUrl(sectionId: string, path?: string, params?: URLSearchParams): string {
    return appendQuery(
        `${API_ENDPOINTS.sections}/${encodeURIComponent(sectionId)}${path ? `/${path}` : ""}`,
        params
    );
}

function submissionUrl(submissionId: string, path: "approve" | "reject"): string {
    return `${API_ENDPOINTS.submissions}/${encodeURIComponent(submissionId)}/${path}`;
}

function appendQuery(url: string, params?: URLSearchParams): string {
    const suffix = params?.toString();
    return suffix ? `${url}?${suffix}` : url;
}