/* ============================================================================
   Legislative Dashboard — frontend (spec §5, DESIGN §3/§5/§10).
   Vanilla JS + fetch against the stdlib API. Two personas on one surface:
   anonymous (overview) and logged-in (personal band + watch/opt-in). No
   frameworks, no build step.
    ========================================================================== */
(function () {
    "use strict";

    var API = "/api/v1";
    var BAND_N = 10;
    var state = {
        token: localStorage.getItem("dash_token") || null,
        user: null,
        prefs: null,
        filters: { upcoming: true, chamber: "", q: "", tags: [] },
        personal: false,
        showReason: false,
        allItems: [],
        tags: [],
    };

    /* ---------- tiny fetch client ---------- */
    function apiFetch(path, opts) {
        opts = opts || {};
        var headers = { "Content-Type": "application/json" };
        if (state.token) headers["Authorization"] = "Bearer " + state.token;
        return fetch(API + path, {
            method: opts.method || "GET",
            headers: headers,
            body: opts.body ? JSON.stringify(opts.body) : undefined,
        }).then(function (r) {
            return r.json().then(function (j) {
                return { status: r.status, body: j };
            });
        });
    }

    function el(id) { return document.getElementById(id); }

    /* ---------- render helpers ---------- */
    function chip(chamber) {
        var c = (chamber || "ASSEMBLY").toLowerCase();
        var label = c === "senate" ? "Senate" : "Assembly";
        return '<span class="chip ' + (c === "senate" ? "sen" : "asm") + '">'
            + label + "</span>";
    }

    function legMatches(ev) {
        var m = (ev.relevance && ev.relevance.matched) || [];
        return m.some(function (x) { return x.type !== "tag"; });
    }
    function tagMatches(ev) {
        var m = (ev.relevance && ev.relevance.matched) || [];
        return m.some(function (x) { return x.type === "tag"; });
    }
    function floatClass(ev) {
        var l = legMatches(ev), t = tagMatches(ev);
        if (t && l) return "both";
        if (t) return "tag-match";
        if (l) return "leg-match";
        return "";
    }

    function rowHTML(ev, opts) {
        opts = opts || {};
        var rel = ev.relevance && ev.relevance.score > 0;
        var cls = "row";
        if (rel) cls += " relevant " + floatClass(ev);
        var time = ev.hearing_time || "time TBD";
        var meta = [time, ev.committee, ev.location, ev.session]
            .filter(Boolean).join(" · ");
        var tags = (ev.tags || []).slice(0, 6)
            .map(function (tg) {
                var on = state.prefs &&
                    (state.prefs.opted_in_tags || []).indexOf(tg) >= 0;
                return '<span class="tag ' +
                    (on ? 'on"' : '"') + ">" + esc(tg) + "</span>";
            }).join("");
        var marker = rel
            ? '<span class="chip marker" title="Floated: relevant to you">'
              + "Relevant to you</span>"
            : "";
        var reasons = "";
        if (rel) {
            var parts = (ev.relevance.matched || []).map(function (x) {
                return esc(x.value);
            });
            reasons = '<div class="reason' +
                (state.showReason ? " show" : "") + '">'
                + "Floated: " + parts.join("; ") + "</div>";
        }
        var url = ev.bill_id
             ? "https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml?bill_id="
             + encodeURIComponent(ev.bill_id)
             : "";
        return '<div class="' + cls + '" data-bill="' +
             esc(ev.bill_id) + '">'
             + '<span class="num">' + chip(ev.chamber_origin) +
                   '<br>' + esc(ev.bill_number) + "</span>"
             + '<div class="main"><span class="title">'
                   + esc(ev.short_title || ev.bill_number) + "</span>"
                   + "<div class='meta'>" + esc(meta) + "</div>"
                   + "<a href='" + url + "' target='_blank'"
                   + " rel='noopener'>View →</a> " + marker
                   + tags
                   + reasons
                   + '</div>'
             + '<div class="actions">'
             + (state.prefs
                  ? '<button class="why-btn" type="button">Why▸</button>'
                  : "")
             + "</div>"
             + "</div>";
    }

    function esc(s) {
        return String(s == null ? "" : s)
            .replace(/&/g, "&amp;").replace(/</g, "&lt;")
            .replace(/>/g, "&gt;").replace(/"/g, "&quot;");
    }

    /* ---------- band rendering ---------- */
    function groupByDay(items) {
        var groups = {};
        items.forEach(function (it) {
            var key = it.date || "TBD";
            if (!groups[key]) groups[key] = { items: [], key: key };
            groups[key].items.push(it);
        });
        return groups;
    }

    function renderGroups(container, items) {
        var byDate = groupByDay(items);
        var html = "";
        Object.keys(byDate).sort().forEach(function (d) {
            var g = byDate[d];
            var label = g.key === "TBD" ? "Date TBD"
                : niceDate(g.key) + " · " + g.items.length +
                      " item" + (g.items.length > 1 ? "s" : "");
            html += '<div class="day-heading"><b>' + esc(label) +
               "</b></div>";
            g.items.forEach(function (ev) {
                html += rowHTML(ev);
            });
        });
        container.innerHTML = html;
        wireRows(container);
    }

    function niceDate(iso) {
        try {
            var d = new Date(iso + "T00:00:00");
            return d.toLocaleDateString(undefined, {
                weekday: "short", month: "short", day: "numeric",
                year: "numeric" });
        } catch (e) { return iso; }
    }

    /* ---------- empty states (DESIGN §6) ---------- */
    function showEmpty(kind, container) {
        var el = el(container);
        var h = "";
        if (kind === "no-next") {
            h = "<h3>No hearings scheduled</h3>" +
                "<p>No upcoming daily-file items in this window.</p>" +
                "<button type='button' class='escape' id='see-past'>" +
                "See recent actions instead</button>";
        } else if (kind === "filter") {
            h = "<h3>No upcoming items match your filters</h3>" +
                "<p><button type='button' class='escape' id='clear'>" +
                "Clear filters</button> · " +
                "<button type='button' class='escape' id='loosen'>" +
                "Loosen to all topics</button> · " +
                "<button type='button' class='escape' id='widen'>" +
                "Widen date window</button></p>";
        } else if (kind === "setup") {
            el.innerHTML = "";
            el.hidden = false;
            el.parentElement.querySelector("#band-setup").hidden = false;
            return;
        } else if (kind === "no-tags") {
            h = "<h3>Topic analysis is filling in</h3>" +
                "<p>Tag chips appear as the topic service warms. " +
                "You can still watch legislators above.</p>";
        }
        el.innerHTML = h;
        el.hidden = false;
        wire(el, kind);
    }

    function clearEmpty(container) {
        var e = el(container);
        e.hidden = true; e.innerHTML = "";
    }

    /* ---------- load + render ---------- */
    function load() {
        var q = new URLSearchParams();
        if (state.filters.upcoming) q.set("upcoming", "1");
        if (state.filters.chamber) q.set("chamber", state.filters.chamber);
        if (state.filters.q) q.set("q", state.filters.q);
        if (state.filters.tags.length)
            q.set("tags", state.filters.tags.join(","));
        if (state.personal && state.token) q.set("personal", "1");
        q.set("full", "1");
        apiFetch("/bills?" + q.toString()).then(function (r) {
            if (r.status !== 200) { return; }
            render(r.body);
        });
    }

    function render(env) {
        // freshness / context band
        el("freshness-updated").textContent =
            "Updated " + (env.as_of || "").slice(0, 10);
        el("freshness-session").textContent = "Session " + (env.session || "");
        var c = env.chamber_availability || {};
        el("freshness-chamber").textContent =
            c.SENATE === "available"
                ? "Senate available"
                : "Senate unavailable today";
        el("freshness-chamber").style.color =
             c.SENATE === "available" ? "var(--muted)" : "var(--warn)";

        var items = env.items || [];
        state.allItems = items;
        var band = items.filter(function (i) {
            return i.relevance && i.relevance.score > 0;
        });
        var bandFull = band;
        var shown = bandFull.slice(0, BAND_N);

        // personal band
        var bandCount = el("band-count");
        bandCount.textContent = bandFull.length
            ? bandFull.length + (bandFull.length > BAND_N
              ? " (showing " + shown.length + ")" : "") : "";
        var list = el("band-list");
        var setup = el("band-setup");
        if (!state.prefs || (state.prefs.watched_legislators || []).length
            === 0 && (state.prefs.opted_in_tags || []).length === 0) {
            list.innerHTML = "";
            setup.hidden = false;
        } else {
            setup.hidden = true;
            if (!shown.length) {
                list.innerHTML = "<p class='meta'>No bills match your " +
                    "watches/topics yet. Add more on the right, or " +
                    "<button type='button' class='escape' id='clear-watch'>" +
                    "Clear filters</button>.</p>";
            } else {
                renderGroups(list, shown);
            }
            var btn = el("btn-show-all");
            btn.hidden = bandFull.length <= BAND_N;
        }

        // all band
        var allCount = el("all-count");
        allCount.textContent = items.length +
            " upcoming" + (items.length === 1 ? " item" : " items");
        var allList = el("all-list");
        var allEmpty = el("all-empty");
        if (!items.length) {
            allList.innerHTML = "";
            showEmpty("no-next", "all-empty");
        } else {
            clearEmpty("all-empty");
            renderGroups(allList, items);
        }

        // aside teaser
        renderTeaser();
        loadTags();
    }

    function renderTeaser() {
        var ul = el("topics-teaser");
        ul.innerHTML = "";
        (state.tags || []).slice(0, 6).forEach(function (t) {
            var li = document.createElement("li");
            li.innerHTML = "<span class='n'>" + t.count + "</span> " +
                esc(t.label);
            var b = document.createElement("button");
            b.type = "button";
            b.textContent = "view";
            b.onclick = function () {
                el("f-tags").value = t.tag_id.split(":")[1];
                state.filters.tags = [el("f-tags").value];
                load();
            };
            li.appendChild(b);
            ul.appendChild(li);
        });
    }

    function loadTags() {
        apiFetch("/tags").then(function (r) {
            if (r.status === 200) {
                state.tags = r.body.tags || [];
                var sel = el("f-tags");
                sel.innerHTML = state.tags
                     .map(function (t) {
                         var name = t.tag_id.split(":")[1];
                         return '<option value="' + esc(name) + '">' +
                              esc(t.label) + " (" + t.count +
                              ")</option>";
                     }).join("");
                     // rehydrate current selection
                Array.prototype.forEach.call(sel.options,
                     function (o) {
                         o.selected =
                                 state.filters.tags.indexOf(o.value) >= 0;
                     });
                renderTeaser();
            } else {
                // "no tagged bills yet" — degrade, no crash
                el("topics-teaser").innerHTML =
                    "<li class='meta'>Topic analysis is filling in…</li>";
            }
        });
    }

    /* ---------- auth (D1a local account, dev) ---------- */
    function signIn(email) {
        apiFetch("/auth/register", { method: "POST",
            body: { email: email } }).then(function (r) {
            if (r.status !== 201) { alert("Sign-in failed"); return; }
            state.token = r.body.token;
            localStorage.setItem("dash_token", r.body.token);
            apiFetch("/prefs", {}).then(function (pr) {
                state.prefs = pr.status === 200 ? pr.body : null;
                refreshUI();
                load();
            });
        });
    }
    function signOut() {
        state.token = null;
        state.prefs = null;
        state.personal = false;
        localStorage.removeItem("dash_token");
        refreshUI();
        load();
    }

    function refreshUI() {
        var has = state.token;
        el("user-band").hidden = !has;
        el("anon-cta").hidden = !!has;
        el("personal-controls").hidden = !has;
        el("aside-title").textContent = has
            ? "Your watchlist" : "Top topics this session";
        if (has) {
            var p = state.prefs || {};
            el("user-band-text").textContent =
                "ZIP " + (p.zip || "—") + " · " +
                ((p.watched_legislators || []).length) +
                " legislators · " +
                ((p.opted_in_tags || []).length) + " topics";
            renderWatch();
            renderTopics();
        }
    }

    /* ---------- watch / topic toggles ---------- */
    function renderWatch() {
        var c = el("resolve-result");
        var p = state.prefs || {};
        var wl = p.watched_legislators || [];
        var html = "";
        wl.forEach(function (id) {
            html += "<div class='candidate'>" +
                "<button type='button' class='watch-btn on' " +
                    "data-leg='" + esc(id) + "'>✓ watching " +
                     esc(pretty(id)) + "</button>" +
                     "<button type='button' class='unwatch-btn ghost' " +
                        "data-leg='" + esc(id) + "'>remove</button>" +
                    "</div>";
        });
        c.innerHTML = html || "";
        wire(c, "watch");
    }

    function renderTopics() {
        var c = el("topic-list");
        var p = state.prefs || {};
        var opted = p.opted_in_tags || [];
        c.innerHTML = (state.tags || []).map(function (t) {
            var name = t.tag_id.split(":")[1];
            var on = opted.indexOf(name) >= 0;
            return "<button type='button' class='topic-chip" +
                 (on ? " on" : "") + "' data-tag='" + esc(name) +
                 "'>" + (on ? "✓ " : "") + esc(t.label) +
                 " <span class='count'>· " + t.count + " bills</span>" +
                 "</button>";
        }).join("");
        wire(c, "topic");
    }

    function toggleWatch(id, on) {
        var path = on
            ? "/prefs/watch"
            : "/prefs/watch/" + encodeURIComponent(id);
        var method = on ? "POST" : "DELETE";
        var body = on ? { legislator_id: id } : null;
        apiFetch(path, { method: method, body: body }).then(function (r) {
            if (r.status === 400 || r.status === 404) {
                alert(r.body.error && r.body.error.message);
            }
            apiFetch("/prefs", {}).then(function (pr) {
                state.prefs = pr.status === 200 ? pr.body : null;
                refreshUI();
                load();
                announce("Ranking updated");
            });
        });
    }

    function toggleTopic(tag, on) {
        var path = on ? "/prefs/topics"
            : "/prefs/topics/" + encodeURIComponent(tag);
        var method = on ? "POST" : "DELETE";
        var body = on ? { tag: tag } : null;
        apiFetch(path, { method: method, body: body }).then(function (r) {
            if (r.status === 400) {
                alert(r.body.error && r.body.error.message);
            }
            apiFetch("/prefs", {}).then(function (pr) {
                state.prefs = pr.status === 200 ? pr.body : null;
                refreshUI();
                load();
                announce("Ranking updated");
            });
        });
    }

    function announce(msg) {
        var a = el("freshness-updated");
        var old = a.textContent;
        a.textContent = old + " · " + msg;
    }

    /* ---------- ZIP resolve (DESIGN §8, §6.4) ---------- */
    function resolve(zip) {
        apiFetch("/districts/resolve", { method: "POST",
            body: { zip: zip } }).then(function (r) {
            var c = el("resolve-result");
            var p = state.prefs || {};
            if (r.status === 200 && r.body.confidence === "single") {
                p.zip = zip;
                var d = r.body.districts[0];
                var mem = d.assembly_member || d.senate_member;
                p.districts = [d];
                if (mem && (p.watched_legislators || []).indexOf(
                        mem.legislator_id) === -1) {
                    toggleWatch(mem.legislator_id, true);
                }
                (r.body.suggested_topics || []).forEach(function (t) {
                    if ((p.opted_in_tags || []).indexOf(t) === -1)
                        toggleTopic(t, true);
                });
                c.innerHTML = "<div class='candidate'>" +
                    "<span class='who'>Resolved: " + esc(d.district_id) +
                    " — " + esc((mem && mem.name) || "") + "</span>" +
                    "</div>" +
                    "<p class='meta'>Watched " +
                    esc((mem && mem.name) || "n/a") +
                    "; suggested topics opted in. " +
                    "Nothing is auto-picked without a confirm here — " +
                    "you can remove any on the right.</p>";
                load();
            } else if (r.status === 200 && r.body.confidence ===
                     "ambiguous") {
                c.innerHTML = "<p class='warning'>" + esc(r.body.note ||
                    "Multiple districts match this ZIP. Confirm one:") +
                    "</p>" +
                    r.body.districts.map(function (d) {
                        var mem = d.assembly_member || d.senate_member;
                        return "<div class='candidate'>" +
                          "<span class='who'>" + esc(d.district_id) +
                          " · " + esc((mem && mem.name) || "unknown") +
                          " <span class='dc'>" +
                          esc((mem && mem.party) || "") + "</span></span>" +
                          "<button type='button' class='confirm-btn ghost' " +
                           "data-dc='" + esc(d.district_id) +
                           "' data-leg='" +
                            esc((mem && mem.legislator_id) || "") + "'>" +
                            "Watch " + esc(d.district_id) + "</button></div>";
                    }).join("");
                wire(c, "resolve-ambiguous");
            } else {
                // zero / out-of-state / other → §6.4 manual fallback
                var msg = r.body && r.body.error
                    ? r.body.error.message
                    : "Could not match that ZIP.";
                c.innerHTML =
                    "<p class='warning'>" + esc(msg) + "</p>" +
                    "<input type='text' id='manual-dc' placeholder=" +
                    "'Pick a district by hand, e.g. A-14'>" +
                    "<button type='button' id='btn-manual' " +
                       "class='ghost'>Confirm</button>";
                el("btn-manual").onclick = function () {
                    var dc = el("manual-dc").value.trim();
                    if (dc) resolveManual(dc);
                };
            }
        });
        state.prefs = state.prefs || {};
    }

    function resolveManual(dc) {
        apiFetch("/districts/resolve", { method: "POST",
            body: { district: dc } }).then(function (r) {
            if (r.status === 200) {
                var p = state.prefs || {};
                p.districts = r.body.districts;
                var mem = r.body.districts[0].assembly_member ||
                    r.body.districts[0].senate_member;
                if (mem) toggleWatch(mem.legislator_id, true);
                load();
            }
        });
    }

    function pretty(id) {
        var m = id.match(/^(A|S)-(\d+)$/i);
        return m ? m[1] + m[2] : id;
    }

    /* ---------- wiring ---------- */
    function wireRows(container) {
        Array.prototype.forEach.call(
            container.querySelectorAll(".why-btn"),
            function (b) {
                b.onclick = function () {
                    var r = b.closest(".row").querySelector(".reason");
                    if (r) r.classList.toggle("show");
                };
            }
        );
    }

    function wire(container, kind) {
        if (kind === "watch") {
            Array.prototype.forEach.call(
                container.querySelectorAll(".unwatch-btn"),
                function (b) {
                    b.onclick = function () {
                        toggleWatch(b.getAttribute("data-leg"), false);
                    };
                }
            );
        }
        if (kind === "topic") {
            Array.prototype.forEach.call(
                container.querySelectorAll(".topic-chip"),
                function (b) {
                    b.onclick = function () {
                        var on = b.classList.contains("on");
                        toggleTopic(b.getAttribute("data-tag"), !on);
                    };
                }
            );
        }
        if (kind === "resolve-ambiguous") {
            Array.prototype.forEach.call(
                container.querySelectorAll(".confirm-btn"),
                function (b) {
                    b.onclick = function () {
                        var lid = b.getAttribute("data-leg");
                        if (lid) toggleWatch(lid, true);
                        var name = b.closest(".candidate")
                            .querySelector(".who").textContent;
                        el("resolve-result").innerHTML =
                            "<div class='candidate'><span class='who'>" +
                             esc(name.trim()) +
                             "</span><span class='dc'>confirmed</span>" +
                             "</div>";
                    };
                }
            );
        }
    }

    function boot() {
        // controls
        el("f-chamber").onchange = function () {
            state.filters.chamber = el("f-chamber").value; load();
        };
        el("f-date").onchange = function () {
            var v = el("f-date").value;
            state.filters.upcoming = (v !== "all");
            load();
        };
        var st;
        el("f-search").oninput = function () {
            clearTimeout(st);
            st = setTimeout(function () {
                state.filters.q = el("f-search").value; load();
            }, 300);
        };
        el("f-tags").onchange = function () {
            state.filters.tags = Array.prototype.slice.call(
                el("f-tags").selectedOptions).map(function (o) {
                return o.value;
            });
            load();
        };
        el("f-reason").onchange = function () {
            state.showReason = el("f-reason").checked;
            Array.prototype.forEach.call(
                document.querySelectorAll(".reason"),
                function (r) { r.classList.toggle("show", state.showReason); });
        };
        el("btn-refresh").onclick = load;
        el("btn-signout").onclick = signOut;
        el("btn-resolve").onclick = function () {
            var z = el("zip-input").value.trim();
            if (z) resolve(z);
        };
        el("btn-setup").onclick = function () {
            var z = el("zip-setup").value.trim();
            if (z) { signIn(z + "@resident.gov"); }
        };
        // unlock CTA
        var u = el("unlocked");
        if (u) u.onclick = function () {
            var em = prompt("Sign in with a resident email (D1a demo):");
            if (em) signIn(em);
        };

        // restore session
        if (state.token) {
            state.personal = true;
            apiFetch("/prefs").then(function (r) {
                if (r.status === 200) {
                    state.prefs = r.body;
                   state.personal = true;
                } else {
                    state.prefs = null;
                }
                refreshUI();
                load();
            });
        }
        refreshUI();
        loadTags();
        load();
    }

    document.addEventListener("DOMContentLoaded", boot);
})();