import type {
    AdminEnvironment,
    AdminPlatform,
    AdminProject,
    AdminProjectList,
    AdminUser,
    AdminUserList,
    ApiKeyList,
    EnvironmentList,
    PlatformList,
    CreatedApiKey,
    CurrentUser,
    InvitationPreview,
    MemberList,
    ProjectRole,
    GridRow,
    KeyRow,
    NamespaceTree,
    Page,
    Project,
    ProjectStats,
    TranslationEntry,
    TranslationStatus,
} from './types';

/**
 * Client HTTP de la Management API.
 *
 * Aucune bibliothèque : `fetch` suffit, et l'API étant servie en même origine,
 * le cookie de session part tout seul. La seule règle à ne pas oublier est
 * `credentials: 'same-origin'`, sans quoi le navigateur n'envoie rien.
 */

export class ApiError extends Error {
    constructor(
        public readonly status: number,
        message: string,
        public readonly detail?: string,
    ) {
        super(message);
        this.name = 'ApiError';
    }

    /** L'utilisateur n'est plus authentifié : sa session a expiré. */
    get isUnauthenticated(): boolean {
        return this.status === 401;
    }

    /** Rejet de validation — le message est destiné à être lu tel quel. */
    get isValidation(): boolean {
        return this.status === 422;
    }

    /** Quelqu'un d'autre a modifié la traduction entre-temps. */
    get isConflict(): boolean {
        return this.status === 409;
    }
}

async function request<T>(path: string, init: RequestInit = {}): Promise<T> {
    const response = await fetch(path, {
        ...init,
        credentials: 'same-origin',
        headers: {
            Accept: 'application/ld+json',
            ...init.headers,
        },
    });

    if (response.status === 204) {
        return undefined as T;
    }

    const text = await response.text();
    const payload = text ? safeParse(text) : null;

    if (!response.ok) {
        // API Platform renvoie `detail` ; nos contrôleurs aussi. C'est le champ
        // rédigé pour un humain, celui qu'on affiche sans le reformuler.
        const detail =
            (payload && typeof payload === 'object' && 'detail' in payload
                ? String((payload as { detail: unknown }).detail)
                : undefined) ?? response.statusText;

        throw new ApiError(response.status, detail, detail);
    }

    return payload as T;
}

function safeParse(text: string): unknown {
    try {
        return JSON.parse(text);
    } catch {
        return null;
    }
}

/**
 * Déplie une collection Hydra.
 *
 * JSON-LD est retenu précisément pour `totalItems` : la grille virtualisée en a
 * besoin pour dimensionner sa zone de défilement sans avoir tout chargé.
 */
function toPage<T>(payload: { member?: T[]; totalItems?: number }): Page<T> {
    return { items: payload.member ?? [], total: payload.totalItems ?? 0 };
}

export interface GridQuery {
    projectUuid: string;
    locale: string;
    platform?: string;
    status?: TranslationStatus;
    namespace?: string;
    q?: string;
    unassigned?: boolean;
    page?: number;
    itemsPerPage?: number;
}

export const api = {
    async me(): Promise<CurrentUser> {
        return request<CurrentUser>('/api/v1/auth/me', { headers: { Accept: 'application/json' } });
    },

    async login(email: string, password: string): Promise<CurrentUser> {
        return request<CurrentUser>('/api/v1/auth/login', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify({ email, password }),
        });
    },

    async logout(): Promise<void> {
        await fetch('/api/v1/auth/logout', { method: 'POST', credentials: 'same-origin' });
    },

    async projects(): Promise<Project[]> {
        const payload = await request<{ member?: Project[] }>('/api/v1/projects');
        return payload.member ?? [];
    },

    async stats(projectUuid: string): Promise<ProjectStats> {
        return request<ProjectStats>(`/api/v1/projects/${projectUuid}/stats`, {
            headers: { Accept: 'application/json' },
        });
    },

    async namespaces(projectUuid: string, locale: string): Promise<NamespaceTree> {
        return request<NamespaceTree>(
            `/api/v1/projects/${projectUuid}/namespaces?locale=${encodeURIComponent(locale)}`,
            { headers: { Accept: 'application/json' } },
        );
    },

    async grid(query: GridQuery): Promise<Page<GridRow>> {
        const params = new URLSearchParams({ locale: query.locale });

        if (query.platform) params.set('platform', query.platform);
        if (query.status) params.set('status', query.status);
        if (query.namespace) params.set('namespace', query.namespace);
        if (query.q) params.set('q', query.q);
        if (query.unassigned) params.set('unassigned', '1');
        params.set('page', String(query.page ?? 1));
        params.set('itemsPerPage', String(query.itemsPerPage ?? 100));

        const payload = await request<{ member?: GridRow[]; totalItems?: number }>(
            `/api/v1/projects/${query.projectUuid}/grid?${params}`,
        );

        return toPage(payload);
    },

    // ── Administration ───────────────────────────────────────────────────

    async members(project: string): Promise<MemberList> {
        return request<MemberList>(`/api/v1/projects/${project}/members`, {
            headers: { Accept: 'application/json' },
        });
    },

    async invite(
        project: string,
        body: { email: string; role: ProjectRole; locales: string[]; isExternal: boolean },
    ): Promise<{ email: string; expiresAt: string; message: string }> {
        return request(`/api/v1/projects/${project}/members/invite`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    async updateMember(
        project: string,
        memberUuid: string,
        body: { role?: ProjectRole; locales?: string[] },
    ): Promise<void> {
        await request(`/api/v1/projects/${project}/members/${memberUuid}`, {
            method: 'PATCH',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    async removeMember(project: string, memberUuid: string): Promise<void> {
        await request(`/api/v1/projects/${project}/members/${memberUuid}`, {
            method: 'DELETE',
            headers: { Accept: 'application/json' },
        });
    },

    async apiKeys(project: string): Promise<ApiKeyList> {
        return request<ApiKeyList>(`/api/v1/projects/${project}/api-keys`, {
            headers: { Accept: 'application/json' },
        });
    },

    async createApiKey(
        project: string,
        body: { name: string; environment: string; scopes: string[] },
    ): Promise<CreatedApiKey> {
        return request<CreatedApiKey>(`/api/v1/projects/${project}/api-keys`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    async revokeApiKey(project: string, keyUuid: string): Promise<void> {
        await request(`/api/v1/projects/${project}/api-keys/${keyUuid}`, {
            method: 'DELETE',
            headers: { Accept: 'application/json' },
        });
    },

    /**
     * Vue par clé : une clé, toutes ses langues.
     *
     * Pas de paramètre `locale` — la réponse les contient toutes. `status`
     * change de sens au passage : « au moins une langue cible est dans cet
     * état », et non « la langue affichée l'est ».
     */
    async keys(query: Omit<GridQuery, 'locale'> & { focus?: boolean }): Promise<Page<KeyRow>> {
        const params = new URLSearchParams();

        if (query.platform) params.set('platform', query.platform);
        if (query.status) params.set('status', query.status);
        if (query.namespace) params.set('namespace', query.namespace);
        if (query.q) params.set('q', query.q);
        if (query.unassigned) params.set('unassigned', '1');
        // Le serveur déduit LUI-MÊME les langues concernées de l'identité
        // courante : ce drapeau demande une file, il ne la décrit pas.
        if (query.focus) params.set('focus', '1');
        params.set('page', String(query.page ?? 1));
        params.set('itemsPerPage', String(query.itemsPerPage ?? 50));

        const payload = await request<{ member?: KeyRow[]; totalItems?: number }>(
            `/api/v1/projects/${query.projectUuid}/keys?${params}`,
        );

        return toPage(payload);
    },

    // ── Plateformes et environnements ────────────────────────────────────

    async platforms(project: string): Promise<PlatformList> {
        return request<PlatformList>(`/api/v1/projects/${project}/platforms-admin`, {
            headers: { Accept: 'application/json' },
        });
    },

    async createPlatform(
        project: string,
        body: {
            name: string;
            slug: string;
            kind: string;
            messageFormat: string;
            exportLayout: string;
            defaultMaxLength: number | null;
        },
    ): Promise<AdminPlatform> {
        return request<AdminPlatform>(`/api/v1/projects/${project}/platforms-admin`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    async updatePlatform(
        project: string,
        platformUuid: string,
        body: {
            name?: string;
            messageFormat?: string;
            exportLayout?: string;
            defaultMaxLength?: number | null;
            isArchived?: boolean;
        },
    ): Promise<AdminPlatform> {
        return request<AdminPlatform>(`/api/v1/projects/${project}/platforms-admin/${platformUuid}`, {
            method: 'PATCH',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    async environments(project: string): Promise<EnvironmentList> {
        return request<EnvironmentList>(`/api/v1/projects/${project}/environments`, {
            headers: { Accept: 'application/json' },
        });
    },

    async createEnvironment(
        project: string,
        body: { name: string; slug: string },
    ): Promise<AdminEnvironment> {
        return request<AdminEnvironment>(`/api/v1/projects/${project}/environments`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    async updateEnvironment(
        project: string,
        environmentUuid: string,
        body: { name?: string },
    ): Promise<AdminEnvironment> {
        return request<AdminEnvironment>(
            `/api/v1/projects/${project}/environments/${environmentUuid}`,
            {
                method: 'PATCH',
                headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
                body: JSON.stringify(body),
            },
        );
    },

    // ── Administration globale (super-admin) ─────────────────────────────

    async adminUsers(search?: string): Promise<AdminUserList> {
        const query = search ? `?q=${encodeURIComponent(search)}` : '';

        return request<AdminUserList>(`/api/v1/admin/users${query}`, {
            headers: { Accept: 'application/json' },
        });
    },

    async updateAdminUser(
        uuid: string,
        body: { isActive?: boolean; isSuperAdmin?: boolean },
    ): Promise<AdminUser> {
        return request<AdminUser>(`/api/v1/admin/users/${uuid}`, {
            method: 'PATCH',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    async adminProjects(): Promise<AdminProjectList> {
        return request<AdminProjectList>('/api/v1/admin/projects', {
            headers: { Accept: 'application/json' },
        });
    },

    async createProject(body: {
        name: string;
        slug: string;
        description: string;
        sourceLocale: string;
        targetLocales: string[];
    }): Promise<AdminProject> {
        return request<AdminProject>('/api/v1/admin/projects', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    // ── Invitation (endpoints publics) ───────────────────────────────────

    async invitationPreview(token: string): Promise<InvitationPreview> {
        return request<InvitationPreview>(`/api/v1/invitations/${encodeURIComponent(token)}`, {
            headers: { Accept: 'application/json' },
        });
    },

    async acceptInvitation(
        token: string,
        body: { name: string; password: string },
    ): Promise<{ email: string; name: string; message: string }> {
        return request(`/api/v1/invitations/${encodeURIComponent(token)}/accept`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
            body: JSON.stringify(body),
        });
    },

    async writeTranslation(
        keyUuid: string,
        locale: string,
        body: { value: string | null; status?: TranslationStatus; version?: number },
    ): Promise<TranslationEntry> {
        return request<TranslationEntry>(
            `/api/v1/keys/${keyUuid}/translations/${encodeURIComponent(locale)}`,
            {
                method: 'PATCH',
                headers: {
                    'Content-Type': 'application/merge-patch+json',
                    Accept: 'application/json',
                },
                body: JSON.stringify(body),
            },
        );
    },
};