<script setup lang="ts">
import { ref, onMounted, computed } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { useOrganizationsStore } from '@/stores/organizations'
import { createApp, getApp, updateApp } from '@/api/client'
import type { Environment } from '@/types'
import AppLayout from '@/components/AppLayout.vue'
import EnvironmentEditor from '@/components/EnvironmentEditor.vue'

const route = useRoute()
const router = useRouter()
const orgStore = useOrganizationsStore()

const orgId = route.params.orgId as string
const appId = route.params.appId as string | undefined
const isEdit = computed(() => !!appId)

const name = ref('')
const environments = ref<Environment[]>([{ name: '', scheme: '' }])
const loading = ref(false)
const error = ref<string | null>(null)
const initialLoading = ref(false)

const org = computed(() => orgStore.organizations.find(o => o.id === orgId))

onMounted(async () => {
  if (isEdit.value && appId) {
    initialLoading.value = true
    try {
      const app = await getApp(orgId, appId)
      name.value = app.name
      environments.value = app.environments.length > 0
        ? app.environments.map(e => ({ ...e }))
        : [{ name: '', scheme: '' }]
    } catch {
      error.value = 'Failed to load app details'
    } finally {
      initialLoading.value = false
    }
  }
})

async function handleSubmit() {
  if (!name.value.trim()) {
    error.value = 'App name is required'
    return
  }

  const validEnvs = environments.value.filter(e => e.name.trim() && e.scheme.trim())

  // Build environments map
  const envsMap: Record<string, string> = {}
  for (const env of validEnvs) {
    envsMap[env.name.trim()] = env.scheme.trim()
  }

  loading.value = true
  error.value = null

  try {
    if (isEdit.value && appId) {
      const updated = await updateApp(orgId, appId, {
        name: name.value.trim(),
        environments: envsMap,
      })
      orgStore.addApp(updated)
      router.push(`/org/${orgId}/app/${appId}`)
    } else {
      const app = await createApp(orgId, {
        name: name.value.trim(),
        environments: envsMap,
      })
      orgStore.addApp(app)
      router.push(`/org/${orgId}/app/${app.id}`)
    }
  } catch (e: unknown) {
    error.value = e instanceof Error ? e.message : 'Failed to save app'
  } finally {
    loading.value = false
  }
}

const backUrl = computed(() =>
  isEdit.value && appId ? `/org/${orgId}/app/${appId}` : `/org/${orgId}`
)
</script>

<template>
  <AppLayout>
    <div class="form-view">
      <div class="form-container">
        <div class="form-header">
          <RouterLink :to="backUrl" class="back-btn">
            <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5">
              <path d="M19 12H5M12 5l-7 7 7 7"/>
            </svg>
          </RouterLink>
          <div>
            <h1 class="form-title">{{ isEdit ? 'Edit App' : 'Add App' }}</h1>
            <div class="form-subtitle" v-if="org">in {{ org.name }}</div>
          </div>
        </div>

        <div v-if="initialLoading" class="loading">
          <div class="spinner"></div>
          Loading…
        </div>

        <form v-else @submit.prevent="handleSubmit">
          <div v-if="error" class="error-message">{{ error }}</div>

          <div class="form-group">
            <label class="form-label">App Name</label>
            <input
              v-model="name"
              class="form-input"
              placeholder="e.g. My Mobile App"
              autofocus
            />
          </div>

          <div class="form-group">
            <label class="form-label">Environments</label>
            <div class="env-header-hint">Each environment needs a name and a URL scheme.</div>
            <EnvironmentEditor v-model="environments" />
          </div>

          <div class="form-actions">
            <RouterLink :to="backUrl" class="btn btn-secondary">Cancel</RouterLink>
            <button
              type="submit"
              class="btn btn-primary"
              :disabled="loading"
            >
              <div v-if="loading" class="spinner" style="width:14px;height:14px;border-width:2px"></div>
              {{ loading ? 'Saving…' : (isEdit ? 'Save Changes' : 'Create App') }}
            </button>
          </div>
        </form>
      </div>
    </div>
  </AppLayout>
</template>

<style scoped>
.form-view {
  padding: 24px;
  display: flex;
  justify-content: center;
}

.form-container {
  width: 100%;
  max-width: 540px;
}

.form-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 28px;
}

.back-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--color-surface-raised);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  text-decoration: none;
  transition: background 0.12s;
  flex-shrink: 0;
  margin-top: 2px;
}

.back-btn:hover {
  background: var(--color-border);
  color: var(--color-text);
}

.form-title {
  font-size: 22px;
  font-weight: 700;
}

.form-subtitle {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 2px;
}

.env-header-hint {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 8px;
}

.form-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 8px;
}
</style>