package templates

import (
	"fmt"

	"veola/internal/models"
)

type ItemFormData struct {
	Page
	IsEdit     bool
	Item       models.Item
	Categories []string
	Errors     []string
}

func itemSelected(have, want string) bool { return have == want }

type selectOpt struct {
	Value string
	Label string
}

// conditionOptions are the eBay-only item-condition filters. Values match the
// vocabulary mapped to Browse API condition IDs in internal/ebay.
func conditionOptions() []selectOpt {
	return []selectOpt{
		{"", "— any —"},
		{"new", "New"},
		{"used", "Used"},
		{"refurbished", "Refurbished"},
		{"parts", "For parts / not working"},
	}
}

// regionOptions are the eBay-only item-location filters, keyed by ISO 3166-1
// alpha-2 country code (the value the Browse API itemLocationCountry filter
// expects).
func regionOptions() []selectOpt {
	return []selectOpt{
		{"", "— any —"},
		{"US", "United States"},
		{"GB", "United Kingdom"},
		{"DE", "Germany"},
		{"FR", "France"},
		{"IT", "Italy"},
		{"ES", "Spain"},
		{"CA", "Canada"},
		{"AU", "Australia"},
		{"JP", "Japan"},
		{"CN", "China"},
		{"HK", "Hong Kong"},
	}
}

type marketplaceOpt struct {
	Value string
	Label string
}

func marketplaceOptions() []marketplaceOpt {
	return []marketplaceOpt{
		{"ebay.com", "eBay (US)"},
		{"ebay.co.uk", "eBay (UK)"},
		{"ebay.de", "eBay (DE)"},
		{"ebay.fr", "eBay (FR)"},
		{"ebay.com.au", "eBay (AU)"},
		{"ebay.ca", "eBay (CA)"},
		{"yahoo.co.jp", "Yahoo Auctions JP"},
		{"mercari.jp", "Mercari JP"},
	}
}

func isKnownMarketplace(v string) bool {
	for _, o := range marketplaceOptions() {
		if o.Value == v {
			return true
		}
	}
	return false
}

func itemHasMarketplace(it models.Item, v string) bool {
	for _, m := range it.Marketplaces {
		if m == v {
			return true
		}
	}
	return false
}

// customMarketplacesCSV returns the comma-separated list of marketplaces on
// the item that are NOT in the curated list, so the user can keep editing
// unusual values without losing them.
func customMarketplacesCSV(it models.Item) string {
	var custom []string
	for _, m := range it.Marketplaces {
		if !isKnownMarketplace(m) {
			custom = append(custom, m)
		}
	}
	return joinCSV(custom)
}

func joinCSV(vs []string) string {
	out := ""
	for i, v := range vs {
		if i > 0 {
			out += ", "
		}
		out += v
	}
	return out
}

func itemHasJapanMarketplace(it models.Item) bool {
	for _, m := range it.Marketplaces {
		if m == "yahoo.co.jp" || m == "mercari.jp" {
			return true
		}
	}
	return false
}

func newCategory(v string, known []string) string {
	if v == "" {
		return ""
	}
	for _, c := range known {
		if c == v {
			return ""
		}
	}
	return v
}

templ itemFormBody(d ItemFormData) {
	<div>
		<h1 class="text-3xl font-semibold mb-6">
			if d.IsEdit {
				Edit { d.Item.Name }
			} else {
				Add Item
			}
		</h1>
		if len(d.Errors) > 0 {
			<div class="v-flash-error">
				<ul class="list-disc pl-5">
					for _, e := range d.Errors {
						<li>{ e }</li>
					}
				</ul>
			</div>
		}
		@itemFormInner(d)
	</div>
}

templ itemFormInner(d ItemFormData) {
	<form
		method="post"
		action={ formAction(d) }
		if !d.IsEdit {
			hx-post="/items/preview"
			hx-target="#preview-target"
			hx-swap="innerHTML"
			hx-indicator="#preview-loading"
			hx-disabled-elt="find button[type='submit']"
		}
		class="v-card p-6 space-y-4 max-w-3xl"
	>
		@CSRFInput(d.CSRFToken)
		<div class="grid md:grid-cols-2 gap-4">
			<div>
				<label class="v-label">Name</label>
				<input class="v-input" name="name" value={ d.Item.Name } required/>
			</div>
			<div>
				<label class="v-label">Category</label>
				<select class="v-select" name="category">
					<option value="" selected?={ d.Item.Category == "" }>— none —</option>
					for _, c := range d.Categories {
						<option value={ c } selected?={ d.Item.Category == c }>{ c }</option>
					}
				</select>
				<input class="v-input mt-2 text-sm" name="category_new" value={ newCategory(d.Item.Category, d.Categories) } placeholder="New category (overrides above)"/>
			</div>
		</div>
		<div>
			<label class="v-label">Search Queries</label>
			<textarea class="v-textarea" name="search_query" rows="4" lang="ja" placeholder="One per line, or comma / semicolon separated">{ d.Item.SearchQuery }</textarea>
			<div class="v-muted text-xs mt-1">Each is searched independently; the lowest price across all wins. Cost scales with the number of queries.</div>
		</div>
		<div>
			<label class="v-label">Product URL</label>
			<input class="v-input" name="url" value={ d.Item.URL }/>
			<div class="v-muted text-xs mt-1">At least one of search queries or URL is required.</div>
		</div>
		<div class="grid md:grid-cols-3 gap-4">
			<div>
				<label class="v-label">Target Price</label>
				<input class="v-input font-mono" name="target_price" type="number" step="0.01" value={ optFloat(d.Item.TargetPrice) }/>
				<div class="v-muted text-xs mt-1">Blank = alert on every new result.</div>
			</div>
			<div>
				<label class="v-label">Ntfy Topic</label>
				<input class="v-input" name="ntfy_topic" value={ d.Item.NtfyTopic } required/>
			</div>
			<div>
				<label class="v-label">Ntfy Priority</label>
				<select class="v-select" name="ntfy_priority">
					for _, p := range []string{"min","low","default","high","urgent"} {
						<option value={ p } selected?={ itemSelected(d.Item.NtfyPriority, p) }>{ p }</option>
					}
				</select>
			</div>
		</div>
		<div class="grid md:grid-cols-3 gap-4">
			<div>
				<label class="v-label">Poll Interval</label>
				<select class="v-select" name="poll_interval_minutes">
					for _, opt := range pollOptions() {
						<option value={ fmt.Sprintf("%d", opt.Minutes) } selected?={ d.Item.PollIntervalMinutes == opt.Minutes }>{ opt.Label }</option>
					}
				</select>
			</div>
			<div>
				<label class="v-label">Marketplaces</label>
				<div id="marketplace-grid" class="grid grid-cols-2 gap-1" onchange="document.getElementById('marketplace-jp-note').hidden = !document.querySelector('#marketplace-grid input[value=&quot;yahoo.co.jp&quot;]:checked, #marketplace-grid input[value=&quot;mercari.jp&quot;]:checked')">
					for _, m := range marketplaceOptions() {
						<label class="flex items-center gap-2 text-sm">
							<input type="checkbox" name="marketplace" value={ m.Value } checked?={ itemHasMarketplace(d.Item, m.Value) }/>
							<span>{ m.Label }</span>
						</label>
					}
				</div>
				<input class="v-input mt-2 text-sm" name="marketplace_custom" value={ customMarketplacesCSV(d.Item) } placeholder="Custom (comma-separated, added to above)"/>
				<div
					id="marketplace-jp-note"
					class="v-flash mt-2 text-sm"
					hidden?={ !itemHasJapanMarketplace(d.Item) }
				>Yahoo Auctions JP and Mercari JP search in Japanese. English queries return few or no results.</div>
				<div class="v-muted text-xs mt-1">Pick one or more. Each is polled per cycle; one failure does not stop the others.</div>
			</div>
			<div>
				<label class="v-label">Listing Type</label>
				<select class="v-select" name="listing_type">
					for _, lt := range []string{"all","BIN","auction"} {
						<option value={ lt } selected?={ itemSelected(d.Item.ListingType, lt) }>{ lt }</option>
					}
				</select>
			</div>
		</div>
		<div class="grid md:grid-cols-2 gap-4">
			<div>
				<label class="v-label">Minimum Price</label>
				<input class="v-input font-mono" name="min_price" type="number" step="0.01" value={ optFloat(d.Item.MinPrice) }/>
				<div class="v-muted text-xs mt-1">Drop results below this price. Filters out accessories and obvious junk.</div>
			</div>
			<div>
				<label class="v-label">Exclude Keywords</label>
				<textarea class="v-textarea" name="exclude_keywords" rows="3" placeholder="One per line, or comma separated">{ d.Item.ExcludeKeywords }</textarea>
				<div class="v-muted text-xs mt-1">Drop results whose title contains any of these. Case-insensitive substring match.</div>
			</div>
		</div>
		<div class="grid md:grid-cols-2 gap-4">
			<div>
				<label class="v-label">Condition</label>
				<select class="v-select" name="condition">
					for _, o := range conditionOptions() {
						<option value={ o.Value } selected?={ itemSelected(d.Item.Condition, o.Value) }>{ o.Label }</option>
					}
				</select>
				<div class="v-muted text-xs mt-1">eBay marketplaces only. Ignored for Yahoo JP, Mercari, and custom actors.</div>
			</div>
			<div>
				<label class="v-label">Item Location</label>
				<select class="v-select" name="region">
					for _, o := range regionOptions() {
						<option value={ o.Value } selected?={ itemSelected(d.Item.Region, o.Value) }>{ o.Label }</option>
					}
				</select>
				<div class="v-muted text-xs mt-1">Restrict to items located in this country. eBay marketplaces only.</div>
			</div>
		</div>
		<label class="flex items-center gap-2">
			<input type="checkbox" name="include_out_of_stock" checked?={ d.Item.IncludeOutOfStock } value="1"/>
			<span>Include out-of-stock results</span>
		</label>
		<details class="v-card-flat p-4">
			<summary class="cursor-pointer font-semibold">Advanced</summary>
			<div class="v-muted text-sm mt-2">Leave blank to use the configured default for the selected marketplace.</div>
			<div class="grid md:grid-cols-2 gap-4 mt-3">
				<div>
					<label class="v-label">Active Listings Actor</label>
					<input class="v-input" name="actor_active" value={ d.Item.ActorActive } placeholder="from config"/>
				</div>
				<div>
					<label class="v-label">Sold Listings Actor</label>
					<input class="v-input" name="actor_sold" value={ d.Item.ActorSold } placeholder="from config"/>
				</div>
				<div>
					<label class="v-label">Price Comparison Actor</label>
					<input class="v-input" name="actor_price_compare" value={ d.Item.ActorPriceCompare } placeholder="from config"/>
				</div>
				<label class="flex items-center gap-2 mt-6">
					<input type="checkbox" name="use_price_comparison" checked?={ d.Item.UsePriceComparison } value="1"/>
					<span>Use price comparison actor in addition to active listings</span>
				</label>
			</div>
		</details>
		<div class="flex items-center gap-3 pt-2">
			if d.IsEdit {
				<button class="v-btn" type="submit">Save</button>
				<a class="v-btn-ghost" href="/items">Cancel</a>
			} else {
				<button class="v-btn" type="submit">Preview</button>
				<a class="v-btn-ghost" href="/items">Cancel</a>
				<span id="preview-loading" class="htmx-indicator v-muted text-sm flex items-center gap-2">
					<span class="v-spinner"></span>
					Running preview… apify runs can take 30–60s.
				</span>
			}
		</div>
	</form>
	if !d.IsEdit {
		<div id="preview-target" class="mt-6"></div>
	}
}

func formAction(d ItemFormData) templ.SafeURL {
	if d.IsEdit {
		return templ.SafeURL(fmt.Sprintf("/items/%d", d.Item.ID))
	}
	return templ.SafeURL("/items/preview")
}

type pollOpt struct {
	Minutes int
	Label   string
}

func pollOptions() []pollOpt {
	return []pollOpt{
		{15, "15 min"}, {30, "30 min"}, {60, "1 hr"}, {120, "2 hr"},
		{360, "6 hr"}, {720, "12 hr"}, {1440, "24 hr"},
	}
}

func optFloat(p *float64) string {
	if p == nil {
		return ""
	}
	return fmt.Sprintf("%.2f", *p)
}

templ ItemForm(d ItemFormData) {
	@Layout(d.Page, itemFormBody(d))
}