package classifier

import (
	"fmt"
	"strings"

	"pete/internal/ingestion"
	"pete/internal/storage"
)

// BuildTier1Prompt builds the routing-only prompt for Tier 1 stories.
func BuildTier1Prompt(item *ingestion.FeedItem, recent []storage.RecentHeadline) string {
	return fmt.Sprintf(`You are a news router for a community discussion platform with three channels: tech, politics, and gaming.

This story comes from a curated Tier 1 source. It will be posted. Your only job is to decide which channel it belongs in.

Choose exactly one channel:
- tech: technology products, software, hardware, industry — where technology itself is the primary subject
- gaming: games, gaming platforms, gaming industry, esports
- politics: everything else — political, policy, current events, public interest, significant world events

Politics is the default. When in doubt, choose politics.

Routing guidance:
- GPU launch, software release, hardware review → tech
- Game release, platform announcement, studio news → gaming
- Election, legislation, court ruling → politics
- AI regulation, antitrust action, surveillance policy → politics (policy is the story, not the technology)
- Death of a public figure → politics
- Violent crime, assassination attempt, arrest of public figure → politics
- Natural disaster, humanitarian crisis → politics
- Celebrity gossip, lifestyle with no broader significance → politics (still gets posted, still needs a home)

For gaming stories only: identify which platforms are relevant from this list:
nintendo-switch, playstation, xbox, pc, retro, mobile, multi
Return an empty array if no specific platform applies.

Also check: does this story cover the same underlying event as any story in the recent window? Different outlets covering the same event counts as a duplicate. If yes, set duplicate_of to that story's GUID. If no match, set duplicate_of to null.

Respond ONLY with valid JSON. No preamble, no explanation outside the JSON:
{
  "channel": "tech|politics|gaming",
  "platforms": [string],
  "duplicate_of": string | null,
  "rationale": "one sentence max, for logging only"
}

INCOMING STORY:
Source: %s
Tier: %d
Feed hint: %s
Headline: %s
Lede: %s

RECENT STORIES (last 24hr):
%s`, item.Source, item.Tier, item.FeedHint, item.Headline, item.Lede, formatRecentStories(recent))
}

// BuildTier2Prompt builds the gating + routing prompt for Tier 2 stories.
func BuildTier2Prompt(item *ingestion.FeedItem, recent []storage.RecentHeadline) string {
	return fmt.Sprintf(`You are a news classifier for a community discussion platform with three channels: tech, politics, and gaming.

This story comes from a wire service. Unlike curated sources, wire feeds publish everything — not all stories warrant posting. First decide if this story is worth posting, then decide where.

Step 1 — Should this be posted?
Post if the story has clear public significance: major world events, policy decisions, significant deaths, natural disasters, major technology developments. Do not post: local news with no broader relevance, routine financial filings, minor sports results, entertainment fluff.

Step 2 — If posting, choose exactly one channel:
- tech: technology products, software, hardware, industry
- gaming: games, gaming platforms, gaming industry
- politics: everything else — the default

Politics is the default when in doubt.

For gaming stories only: identify relevant platforms from: nintendo-switch, playstation, xbox, pc, retro, mobile, multi

Also check for duplicates against the recent window. If this story covers the same underlying event as a recent story, set duplicate_of to that story's GUID.

Respond ONLY with valid JSON:
{
  "post": true|false,
  "channel": "tech|politics|gaming",
  "platforms": [string],
  "duplicate_of": string | null,
  "rationale": "one sentence max, for logging only"
}

If post is false, channel may be omitted.

INCOMING STORY:
Source: %s
Tier: %d
Feed hint: %s
Headline: %s
Lede: %s

RECENT STORIES (last 24hr):
%s`, item.Source, item.Tier, item.FeedHint, item.Headline, item.Lede, formatRecentStories(recent))
}

func formatRecentStories(recent []storage.RecentHeadline) string {
	if len(recent) == 0 {
		return "(none)"
	}
	var sb strings.Builder
	for _, h := range recent {
		fmt.Fprintf(&sb, "[%s] %s — %s\n", h.GUID, h.Headline, h.Source)
	}
	return sb.String()
}