import type { AgentPromptMetadata } from "./types"
import { truncateDescription } from "../shared/truncate-description"

export interface AvailableAgent {
  name: string
  description: string
  metadata: AgentPromptMetadata
}

export interface AvailableTool {
  name: string
  category: "lsp" | "ast" | "search" | "session" | "command" | "other"
}

export interface AvailableSkill {
  name: string
  description: string
  location: "user" | "project" | "plugin"
}

export interface AvailableCategory {
  name: string
  description: string
  model?: string
}

export function categorizeTools(toolNames: string[]): AvailableTool[] {
  return toolNames.map((name) => {
    let category: AvailableTool["category"] = "other"
    if (name.startsWith("lsp_")) {
      category = "lsp"
    } else if (name.startsWith("ast_grep")) {
      category = "ast"
    } else if (name === "grep" || name === "glob") {
      category = "search"
    } else if (name.startsWith("session_")) {
      category = "session"
    } else if (name === "skill") {
      category = "command"
    }
    return { name, category }
  })
}

function formatToolsForPrompt(tools: AvailableTool[]): string {
  const lspTools = tools.filter((t) => t.category === "lsp")
  const astTools = tools.filter((t) => t.category === "ast")
  const searchTools = tools.filter((t) => t.category === "search")

  const parts: string[] = []

  if (searchTools.length > 0) {
    parts.push(...searchTools.map((t) => `\`${t.name}\``))
  }

  if (lspTools.length > 0) {
    parts.push("`lsp_*`")
  }

  if (astTools.length > 0) {
    parts.push("`ast_grep`")
  }

  return parts.join(", ")
}

export function buildKeyTriggersSection(agents: AvailableAgent[], _skills: AvailableSkill[] = []): string {
  const keyTriggers = agents
    .filter((a) => a.metadata.keyTrigger)
    .map((a) => `- ${a.metadata.keyTrigger}`)

  if (keyTriggers.length === 0) return ""

  return `### Key Triggers (check BEFORE classification):

${keyTriggers.join("\n")}
- **"Look into" + "create PR"** → Not just research. Full implementation cycle expected.`
}

export function buildToolSelectionTable(
  agents: AvailableAgent[],
  tools: AvailableTool[] = [],
  _skills: AvailableSkill[] = []
): string {
  const rows: string[] = [
    "### Tool & Agent Selection:",
    "",
  ]

  if (tools.length > 0) {
    const toolsDisplay = formatToolsForPrompt(tools)
    rows.push(`- ${toolsDisplay} — **FREE** — Not Complex, Scope Clear, No Implicit Assumptions`)
  }

  const costOrder = { FREE: 0, CHEAP: 1, EXPENSIVE: 2 }
  const sortedAgents = [...agents]
    .filter((a) => a.metadata.category !== "utility")
    .sort((a, b) => costOrder[a.metadata.cost] - costOrder[b.metadata.cost])

  for (const agent of sortedAgents) {
    const shortDesc = agent.description.split(".")[0] || agent.description
    rows.push(`- \`${agent.name}\` agent — **${agent.metadata.cost}** — ${shortDesc}`)
  }

  rows.push("")
  rows.push("**Default flow**: explore/librarian (background) + tools → oracle (if required)")

  return rows.join("\n")
}

export function buildExploreSection(agents: AvailableAgent[]): string {
  const exploreAgent = agents.find((a) => a.name === "explore")
  if (!exploreAgent) return ""

  const useWhen = exploreAgent.metadata.useWhen || []
  const avoidWhen = exploreAgent.metadata.avoidWhen || []

  return `### Explore Agent = Contextual Grep

Use it as a **peer tool**, not a fallback. Fire liberally.

**Use Direct Tools when:**
${avoidWhen.map((w) => `- ${w}`).join("\n")}

**Use Explore Agent when:**
${useWhen.map((w) => `- ${w}`).join("\n")}`
}

export function buildLibrarianSection(agents: AvailableAgent[]): string {
  const librarianAgent = agents.find((a) => a.name === "librarian")
  if (!librarianAgent) return ""

  const useWhen = librarianAgent.metadata.useWhen || []

  return `### Librarian Agent = Reference Grep

Search **external references** (docs, OSS, web). Fire proactively when unfamiliar libraries are involved.

**Contextual Grep (Internal)** — search OUR codebase, find patterns in THIS repo, project-specific logic.
**Reference Grep (External)** — search EXTERNAL resources, official API docs, library best practices, OSS implementation examples.

**Trigger phrases** (fire librarian immediately):
${useWhen.map((w) => `- "${w}"`).join("\n")}`
}

export function buildDelegationTable(agents: AvailableAgent[]): string {
  const rows: string[] = [
    "### Delegation Table:",
    "",
  ]

  for (const agent of agents) {
    for (const trigger of agent.metadata.triggers) {
      rows.push(`- **${trigger.domain}** → \`${agent.name}\` — ${trigger.trigger}`)
    }
  }

  return rows.join("\n")
}

/**
 * Renders the "User-Installed Skills (HIGH PRIORITY)" block used across multiple agent prompts.
 * Extracted to avoid duplication between buildCategorySkillsDelegationGuide, buildSkillsSection, etc.
 */
export function formatCustomSkillsBlock(
  customRows: string[],
  customSkills: AvailableSkill[],
  headerLevel: "####" | "**" = "####"
): string {
  const header = headerLevel === "####"
    ? `#### User-Installed Skills (HIGH PRIORITY)`
    : `**User-Installed Skills (HIGH PRIORITY):**`

  return `${header}

**The user has installed these custom skills. They MUST be evaluated for EVERY delegation.**
Subagents are STATELESS — they lose all custom knowledge unless you pass these skills via \`load_skills\`.

${customRows.join("\n")}

> **CRITICAL**: Ignoring user-installed skills when they match the task domain is a failure.
> The user installed custom skills for a reason — USE THEM when the task overlaps with their domain.`
}

export function buildCategorySkillsDelegationGuide(categories: AvailableCategory[], skills: AvailableSkill[]): string {
  if (categories.length === 0 && skills.length === 0) return ""

  const categoryRows = categories.map((c) => {
    const desc = c.description || c.name
    return `- \`${c.name}\` — ${desc}`
  })

  const builtinSkills = skills.filter((s) => s.location === "plugin")
  const customSkills = skills.filter((s) => s.location !== "plugin")

   const builtinRows = builtinSkills.map((s) => {
     const desc = truncateDescription(s.description)
     return `- \`${s.name}\` — ${desc}`
   })

   const customRows = customSkills.map((s) => {
     const desc = truncateDescription(s.description)
     const source = s.location === "project" ? "project" : "user"
     return `- \`${s.name}\` (${source}) — ${desc}`
   })

  const customSkillBlock = formatCustomSkillsBlock(customRows, customSkills)

  let skillsSection: string

  if (customSkills.length > 0 && builtinSkills.length > 0) {
    skillsSection = `#### Built-in Skills

${builtinRows.join("\n")}

${customSkillBlock}`
  } else if (customSkills.length > 0) {
    skillsSection = customSkillBlock
  } else {
    skillsSection = `#### Available Skills (Domain Expertise Injection)

Skills inject specialized instructions into the subagent. Read the description to understand when each skill applies.

${builtinRows.join("\n")}`
  }

  return `### Category + Skills Delegation System

**task() combines categories and skills for optimal task execution.**

#### Available Categories (Domain-Optimized Models)

Each category is configured with a model optimized for that domain. Read the description to understand when to use it.

${categoryRows.join("\n")}

${skillsSection}

---

### MANDATORY: Category + Skill Selection Protocol

**STEP 1: Select Category**
- Read each category's description
- Match task requirements to category domain
- Select the category whose domain BEST fits the task

**STEP 2: Evaluate ALL Skills (Built-in AND User-Installed)**
For EVERY skill listed above, ask yourself:
> "Does this skill's expertise domain overlap with my task?"

- If YES → INCLUDE in \`load_skills=[...]\`
- If NO → You MUST justify why (see below)
${customSkills.length > 0 ? `
> **User-installed skills get PRIORITY.** The user explicitly installed them for their workflow.
> When in doubt about a user-installed skill, INCLUDE it rather than omit it.` : ""}

**STEP 3: Justify Omissions**

If you choose NOT to include a skill that MIGHT be relevant, you MUST provide:

\`\`\`
SKILL EVALUATION for "[skill-name]":
- Skill domain: [what the skill description says]
- Task domain: [what your task is about]
- Decision: OMIT
- Reason: [specific explanation of why domains don't overlap]
\`\`\`

**WHY JUSTIFICATION IS MANDATORY:**
- Forces you to actually READ skill descriptions
- Prevents lazy omission of potentially useful skills
- Subagents are STATELESS - they only know what you tell them
- Missing a relevant skill = suboptimal output

---

### Delegation Pattern

\`\`\`typescript
task(
  category="[selected-category]",
  load_skills=["skill-1", "skill-2"],  // Include ALL relevant skills — ESPECIALLY user-installed ones
  prompt="..."
)
\`\`\`

**ANTI-PATTERN (will produce poor results):**
\`\`\`typescript
task(category="...", load_skills=[], run_in_background=false, prompt="...")  // Empty load_skills without justification
\`\`\``
}

export function buildOracleSection(agents: AvailableAgent[]): string {
  const oracleAgent = agents.find((a) => a.name === "oracle")
  if (!oracleAgent) return ""

  const useWhen = oracleAgent.metadata.useWhen || []
  const avoidWhen = oracleAgent.metadata.avoidWhen || []

  return `<Oracle_Usage>
## Oracle — Read-Only High-IQ Consultant

Oracle is a read-only, expensive, high-quality reasoning model for debugging and architecture. Consultation only.

### WHEN to Consult (Oracle FIRST, then implement):

${useWhen.map((w) => `- ${w}`).join("\n")}

### WHEN NOT to Consult:

${avoidWhen.map((w) => `- ${w}`).join("\n")}

### Usage Pattern:
Briefly announce "Consulting Oracle for [reason]" before invocation.

**Exception**: This is the ONLY case where you announce before acting. For all other work, start immediately without status updates.

### Oracle Background Task Policy:

**You MUST collect Oracle results before your final answer. No exceptions.**

- Oracle may take several minutes. This is normal and expected.
- When Oracle is running and you finish your own exploration/analysis, your next action is \`background_output(task_id="...")\` on Oracle — NOT delivering a final answer.
- Oracle catches blind spots you cannot see — its value is HIGHEST when you think you don't need it.
- **NEVER** cancel Oracle. **NEVER** use \`background_cancel(all=true)\` when Oracle is running. Cancel disposable tasks (explore, librarian) individually by taskId instead.
</Oracle_Usage>`
}

export function buildHardBlocksSection(): string {
  const blocks = [
    "- Type error suppression (`as any`, `@ts-ignore`) — **Never**",
    "- Commit without explicit request — **Never**",
    "- Speculate about unread code — **Never**",
    "- Leave code in broken state after failures — **Never**",
    "- `background_cancel(all=true)` when Oracle is running — **Never.** Cancel tasks individually by taskId.",
    "- Delivering final answer before collecting Oracle result — **Never.** Always `background_output` Oracle first.",
  ]

  return `## Hard Blocks (NEVER violate)

${blocks.join("\n")}`
}

export function buildAntiPatternsSection(): string {
  const patterns = [
    "- **Type Safety**: `as any`, `@ts-ignore`, `@ts-expect-error`",
    "- **Error Handling**: Empty catch blocks `catch(e) {}`",
    "- **Testing**: Deleting failing tests to \"pass\"",
    "- **Search**: Firing agents for single-line typos or obvious syntax errors",
    "- **Debugging**: Shotgun debugging, random changes",
    "- **Background Tasks**: `background_cancel(all=true)` — always cancel individually by taskId",
    "- **Oracle**: Skipping Oracle results when Oracle was launched — ALWAYS collect via `background_output`",
  ]

  return `## Anti-Patterns (BLOCKING violations)

${patterns.join("\n")}`
}

export function buildUltraworkSection(
  agents: AvailableAgent[],
  categories: AvailableCategory[],
  skills: AvailableSkill[]
): string {
  const lines: string[] = []

  if (categories.length > 0) {
    lines.push("**Categories** (for implementation tasks):")
    for (const cat of categories) {
      const shortDesc = cat.description || cat.name
      lines.push(`- \`${cat.name}\`: ${shortDesc}`)
    }
    lines.push("")
  }

  if (skills.length > 0) {
    const builtinSkills = skills.filter((s) => s.location === "plugin")
    const customSkills = skills.filter((s) => s.location !== "plugin")

    if (builtinSkills.length > 0) {
      lines.push("**Built-in Skills** (combine with categories):")
      for (const skill of builtinSkills) {
        const shortDesc = skill.description.split(".")[0] || skill.description
        lines.push(`- \`${skill.name}\`: ${shortDesc}`)
      }
      lines.push("")
    }

    if (customSkills.length > 0) {
      lines.push("**User-Installed Skills** (HIGH PRIORITY - user installed these for their workflow):")
      for (const skill of customSkills) {
        const shortDesc = skill.description.split(".")[0] || skill.description
        lines.push(`- \`${skill.name}\`: ${shortDesc}`)
      }
      lines.push("")
    }
  }

  if (agents.length > 0) {
    const ultraworkAgentPriority = ["explore", "librarian", "plan", "oracle"]
    const sortedAgents = [...agents].sort((a, b) => {
      const aIdx = ultraworkAgentPriority.indexOf(a.name)
      const bIdx = ultraworkAgentPriority.indexOf(b.name)
      if (aIdx === -1 && bIdx === -1) return 0
      if (aIdx === -1) return 1
      if (bIdx === -1) return -1
      return aIdx - bIdx
    })

    lines.push("**Agents** (for specialized consultation/exploration):")
    for (const agent of sortedAgents) {
      const shortDesc = agent.description.length > 120 ? agent.description.slice(0, 120) + "..." : agent.description
      const suffix = agent.name === "explore" || agent.name === "librarian" ? " (multiple)" : ""
      lines.push(`- \`${agent.name}${suffix}\`: ${shortDesc}`)
    }
  }

  return lines.join("\n")
}