const std = @import("std");
const api = @import("api");
const query_utils = @import("../query.zig");

pub const global = struct {
    pub const method = .GET;
    pub const path = "/timelines/global";

    pub const Query = api.TimelineArgs;

    pub fn handler(req: anytype, res: anytype, srv: anytype) !void {
        const results = try srv.globalTimeline(req.query);

        var link = std.ArrayList(u8).init(req.allocator);
        const link_writer = link.writer();
        defer link.deinit();

        try writeLink(link_writer, srv.community, path, results.next_page, "next");
        try link_writer.writeByte(',');
        try writeLink(link_writer, srv.community, path, results.prev_page, "prev");

        try res.headers.put("Link", link.items);

        try res.json(.ok, results.items);
    }
};

pub const local = struct {
    pub const method = .GET;
    pub const path = "/timelines/local";

    pub const Query = api.TimelineArgs;

    pub fn handler(req: anytype, res: anytype, srv: anytype) !void {
        const results = try srv.localTimeline(req.query);

        var link = std.ArrayList(u8).init(req.allocator);
        const link_writer = link.writer();
        defer link.deinit();

        try writeLink(link_writer, srv.community, path, results.next_page, "next");
        try link_writer.writeByte(',');
        try writeLink(link_writer, srv.community, path, results.prev_page, "prev");

        try res.headers.put("Link", link.items);

        try res.json(.ok, results.items);
    }
};

// TOOD: unify with communities.zig
fn writeLink(
    writer: anytype,
    community: api.Community,
    path: []const u8,
    params: anytype,
    rel: []const u8,
) !void {
    // TODO: percent-encode
    try std.fmt.format(
        writer,
        "<{s}://{s}/{s}?",
        .{ @tagName(community.scheme), community.host, path },
    );

    try query_utils.formatQuery(params, writer);

    try std.fmt.format(
        writer,
        ">; rel=\"{s}\"",
        .{rel},
    );
}