@model StoryIntelligenceProgressViewModel
@{
    ViewData["Title"] = "Review locations";
    var locationCandidates = Model.LocationReview.Candidates.ToList();
}

<section class="onboarding-shell" aria-labelledby="story-location-title">
    <div class="onboarding-panel onboarding-review-panel story-review-page">
        <div class="onboarding-copy story-review-heading">
            <p class="eyebrow">Story Intelligence</p>
            <h1 id="story-location-title">Review Locations</h1>
            <p>Review place suggestions that need a create, link, alias, or ignore decision.</p>
        </div>

        @if (TempData["OnboardingStoryIntelligenceError"] is string error)
        {
            <div class="alert alert-danger">@error</div>
        }
        @if (TempData["OnboardingStoryIntelligenceMessage"] is string message)
        {
            <div class="alert alert-success">@message</div>
        }

        <section class="story-review-chapter-list" aria-label="Location review">
            @if (Model.LocationReview.Candidates.Count == 0)
            {
                <div class="story-review-note">
                    <strong>No location decisions are waiting.</strong>
                    <p class="mb-0">Locations are already up to date, or there were no location suggestions ready to import.</p>
                </div>
                <div class="onboarding-actions">
                    <a class="btn btn-outline-secondary" asp-action="StoryIntelligenceReviewCentre" asp-route-batchId="@Model.BatchID">Back to Review Centre</a>
                </div>
            }
            else
            {
                <div class="story-review-card-actions">
                    <button class="btn btn-outline-secondary btn-sm" type="button" data-location-bulk="link-existing">Link existing matches</button>
                    <button class="btn btn-outline-secondary btn-sm" type="button" data-location-bulk="expand">Expand all</button>
                    <button class="btn btn-outline-secondary btn-sm" type="button" data-location-bulk="collapse">Collapse all</button>
                </div>

                <form asp-action="ImportStoryIntelligenceLocations" method="post" data-location-review-form data-story-review-form>
                    <input type="hidden" name="BatchID" value="@Model.BatchID" />
                    <div class="story-review-filters" aria-label="Location candidate filters">
                        <div>
                            <label class="form-label" for="location-candidate-search">Search</label>
                            <input id="location-candidate-search" class="form-control" type="search" placeholder="Search locations or matches" data-location-search />
                        </div>
                        <div>
                            <label class="form-label" for="location-candidate-status">Filter</label>
                            <select id="location-candidate-status" class="form-select" data-location-status-filter>
                                <option value="needs-review">Needs review</option>
                                <option value="existing">Existing matches</option>
                                <option value="new">New locations</option>
                                <option value="all">All visible candidates</option>
                            </select>
                        </div>
                        <div class="story-review-page-status" data-location-page-status>
                            Showing @Math.Min(locationCandidates.Count, 24).ToString("N0") of @locationCandidates.Count.ToString("N0")
                        </div>
                        <div class="story-review-pager">
                            <button class="btn btn-outline-secondary btn-sm" type="button" data-location-page-prev>Previous</button>
                            <button class="btn btn-outline-secondary btn-sm" type="button" data-location-page-next>Next</button>
                        </div>
                    </div>
                    <div class="story-character-card-grid">
                        @for (var i = 0; i < locationCandidates.Count; i++)
                        {
                            var candidate = locationCandidates[i];
                            var status = candidate.IsExistingMatch ? "existing" : "new";
                            var searchText = string.Join(" ", new[] { candidate.LocationName, candidate.ExistingLocationName, candidate.Category, candidate.ParentLocationHint });
                            <details class="story-character-card" open data-location-card data-location-status="@status" data-location-search-text="@searchText">
                                <summary>
                                    <span>
                                        <strong>@candidate.LocationName</strong>
                                        <small>@candidate.Category · @candidate.AppearsInScenes.ToString("N0") scene@(candidate.AppearsInScenes == 1 ? string.Empty : "s")</small>
                                    </span>
                                    <em>@candidate.Confidence</em>
                                </summary>

                                <input type="hidden" name="Locations[@i].Key" value="@candidate.Key" />

                                <div class="story-character-card__body" data-location-key="@candidate.Key" data-location-name="@candidate.LocationName">
                                    <dl>
                                        <div><dt>First appearance</dt><dd>@Display(candidate.ExampleFirstAppearance)</dd></div>
                                        <div><dt>Parent hint</dt><dd>@Display(candidate.ParentLocationHint)</dd></div>
                                        <div><dt>Existing match</dt><dd>@(candidate.ExistingLocationName ?? "None")</dd></div>
                                    </dl>

                                    @if (!string.IsNullOrWhiteSpace(candidate.ExampleContext))
                                    {
                                        <div class="story-review-note">
                                            <strong>Scene context</strong>
                                            <p>@candidate.ExampleContext</p>
                                        </div>
                                    }

                                    @if (candidate.EvidenceSummaries.Any())
                                    {
                                        <details class="story-review-note">
                                            <summary>Evidence from @candidate.AppearsInScenes.ToString("N0") scene@(candidate.AppearsInScenes == 1 ? string.Empty : "s")</summary>
                                            <ul class="mb-0">
                                                @foreach (var evidence in candidate.EvidenceSummaries)
                                                {
                                                    <li>@evidence</li>
                                                }
                                            </ul>
                                        </details>
                                    }

                                    @if (candidate.IsExistingMatch)
                                    {
                                        <div class="story-review-note">
                                            <strong>Possible existing location</strong>
                                            <p>@candidate.LocationName may already be @candidate.ExistingLocationName. Choose whether to link them or create a separate location.</p>
                                        </div>
                                    }

                                    <fieldset class="story-character-actions">
                                        <legend>Decision</legend>
                                        <label>
                                            <input type="radio" name="Locations[@i].Action" value="@StoryIntelligenceLocationImportActions.CreateNew" checked data-location-action />
                                            Create new location
                                        </label>
                                        <label>
                                            <input type="radio" name="Locations[@i].Action" value="@StoryIntelligenceLocationImportActions.LinkExisting" data-location-action @(candidate.IsExistingMatch ? string.Empty : "disabled") />
                                            Link existing location
                                        </label>
                                        <label>
                                            <input type="radio" name="Locations[@i].Action" value="@StoryIntelligenceLocationImportActions.Alias" data-location-action />
                                            Alias of another location
                                        </label>
                                        <label>
                                            <input type="radio" name="Locations[@i].Action" value="@StoryIntelligenceLocationImportActions.Ignore" data-location-action />
                                            Ignore
                                        </label>
                                    </fieldset>

                                    <div data-location-import-name-panel>
                                        <label class="form-label" for="location-import-name-@i">Import name</label>
                                        <input id="location-import-name-@i" class="form-control" name="Locations[@i].ImportName" value="@candidate.ImportName" />
                                    </div>

                                    <div data-location-alias-panel hidden>
                                        <label class="form-label" for="location-alias-target-@i">Alias/variant target</label>
                                        <select id="location-alias-target-@i" class="form-select" name="Locations[@i].AliasTargetKey" data-location-alias-target>
                                            <option value="">Choose location...</option>
                                            @foreach (var target in Model.LocationReview.Candidates.Where(target => !string.Equals(target.Key, candidate.Key, StringComparison.OrdinalIgnoreCase)))
                                            {
                                                <option value="@target.Key">@target.LocationName@(target.IsExistingMatch ? $" -> {target.ExistingLocationName}" : string.Empty)</option>
                                            }
                                        </select>
                                    </div>
                                </div>
                            </details>
                        }
                    </div>

                    <div class="onboarding-actions">
                        <a class="btn btn-outline-secondary" asp-action="StoryIntelligenceReviewCentre" asp-route-batchId="@Model.BatchID">Back to Review Centre</a>
                        <button class="btn btn-primary" type="submit" data-busy-label="Saving locations...">Save location decisions</button>
                    </div>
                </form>
            }
        </section>
    </div>
</section>

@section Scripts {
    <script>
        (() => {
            const form = document.querySelector("[data-location-review-form]");
            if (!form) return;

            const pageSize = 24;
            let currentPage = 1;
            const cards = () => Array.from(form.querySelectorAll("[data-location-card]"));
            const search = form.querySelector("[data-location-search]");
            const statusFilter = form.querySelector("[data-location-status-filter]");
            const pageStatus = form.querySelector("[data-location-page-status]");
            const previousPage = form.querySelector("[data-location-page-prev]");
            const nextPage = form.querySelector("[data-location-page-next]");
            const setAction = (card, action) => {
                const input = card.querySelector(`[data-location-action][value="${action}"]`);
                if (input) {
                    input.checked = true;
                    updateCard(card);
                }
            };
            const actionFor = (card) => card.querySelector("[data-location-action]:checked")?.value || "@StoryIntelligenceLocationImportActions.CreateNew";
            const isCanonicalTarget = (card) => {
                const action = actionFor(card);
                return action !== "@StoryIntelligenceLocationImportActions.Ignore" && action !== "@StoryIntelligenceLocationImportActions.Alias";
            };
            const updateAliasTargets = () => {
                const allCards = cards();
                for (const card of allCards) {
                    const body = card.querySelector("[data-location-key]");
                    const ownKey = body?.getAttribute("data-location-key") || "";
                    const select = card.querySelector("[data-location-alias-target]");
                    if (!select) continue;

                    const previous = select.value;
                    for (const option of Array.from(select.options)) {
                        if (!option.value) continue;
                        const targetCard = allCards.find(item => item.querySelector("[data-location-key]")?.getAttribute("data-location-key") === option.value);
                        option.disabled = option.value === ownKey || !targetCard || !isCanonicalTarget(targetCard);
                    }
                    if (select.selectedOptions[0]?.disabled) {
                        select.value = "";
                    } else {
                        select.value = previous;
                    }
                }
            };
            const updateCard = (card) => {
                const action = actionFor(card);
                const namePanel = card.querySelector("[data-location-import-name-panel]");
                const aliasPanel = card.querySelector("[data-location-alias-panel]");
                if (namePanel) namePanel.hidden = action === "@StoryIntelligenceLocationImportActions.Ignore" || action === "@StoryIntelligenceLocationImportActions.Alias";
                if (aliasPanel) aliasPanel.hidden = action !== "@StoryIntelligenceLocationImportActions.Alias";
                updateAliasTargets();
            };
            const matchesFilters = (card) => {
                const term = (search?.value || "").trim().toLocaleLowerCase();
                const status = statusFilter?.value || "needs-review";
                const cardStatus = card.getAttribute("data-location-status") || "new";
                const haystack = (card.getAttribute("data-location-search-text") || "").toLocaleLowerCase();
                if (term && !haystack.includes(term)) return false;
                if (status === "existing" && cardStatus !== "existing") return false;
                if (status === "new" && cardStatus !== "new") return false;
                return true;
            };
            const renderPage = () => {
                const allCards = cards();
                const filtered = allCards.filter(matchesFilters);
                const pages = Math.max(1, Math.ceil(filtered.length / pageSize));
                if (currentPage > pages) currentPage = pages;
                const start = (currentPage - 1) * pageSize;
                const visible = new Set(filtered.slice(start, start + pageSize));
                for (const card of allCards) {
                    card.hidden = !visible.has(card);
                }
                if (pageStatus) {
                    const end = filtered.length === 0 ? 0 : Math.min(filtered.length, start + pageSize);
                    pageStatus.textContent = filtered.length === 0
                        ? "No matching location candidates"
                        : `Showing ${start + 1}-${end} of ${filtered.length} location candidates · Page ${currentPage} of ${pages}`;
                }
                if (previousPage) previousPage.disabled = currentPage <= 1;
                if (nextPage) nextPage.disabled = currentPage >= pages;
            };
            document.querySelectorAll("[data-location-bulk]").forEach(button => {
                button.addEventListener("click", () => {
                    const action = button.getAttribute("data-location-bulk");
                    if (action === "link-existing") cards().forEach(card => {
                        if (card.querySelector(`[data-location-action][value="@StoryIntelligenceLocationImportActions.LinkExisting"]:not(:disabled)`)) {
                            setAction(card, "@StoryIntelligenceLocationImportActions.LinkExisting");
                        }
                    });
                    if (action === "expand") cards().forEach(card => card.open = true);
                    if (action === "collapse") cards().forEach(card => card.open = false);
                    renderPage();
                });
            });
            previousPage?.addEventListener("click", () => { currentPage = Math.max(1, currentPage - 1); renderPage(); });
            nextPage?.addEventListener("click", () => { currentPage += 1; renderPage(); });
            search?.addEventListener("input", () => { currentPage = 1; renderPage(); });
            statusFilter?.addEventListener("change", () => { currentPage = 1; renderPage(); });
            form.querySelectorAll("[data-location-action]").forEach(input => {
                input.addEventListener("change", () => updateCard(input.closest("[data-location-card]")));
            });
            cards().forEach(updateCard);
            renderPage();
        })();
    </script>
    <script src="~/js/story-review-actions.js" asp-append-version="true"></script>
}

@functions {
    private static string Display(string? value) => string.IsNullOrWhiteSpace(value) ? "Not detected" : value;
}